Term IRI Term label Parent term IRI Parent term label Alternative term Definition http://purl.obolibrary.org/obo/REX_0000002 chemical reaction http://purl.obolibrary.org/obo/REX_0000167 macroscopic process A process involving the interconversion of chemical species. http://purl.obolibrary.org/obo/REX_0000003 nuclear transformation http://purl.obolibrary.org/obo/REX_0000011 nuclear transition The change of one nuclide into another with a different proton number or nucleon number. http://purl.obolibrary.org/obo/REX_0000004 nuclear decay http://purl.obolibrary.org/obo/REX_0000003 nuclear transformation A spontaneous nuclear transformation. http://purl.obolibrary.org/obo/REX_0000005 nuclear disintegration http://purl.obolibrary.org/obo/REX_0000004 nuclear decay Nuclear decay involving a splitting into more nuclei or the emission of particles. http://purl.obolibrary.org/obo/REX_0000006 electron capture http://purl.obolibrary.org/obo/REX_0000010 capture A nuclear transformation in which the nucleus captures an orbital electron. http://purl.obolibrary.org/obo/REX_0000007 beta-decay http://purl.obolibrary.org/obo/REX_0000012 radioactive decay Nuclear decay in which a beta particle is emitted or in which orbital electron capture occurs. http://purl.obolibrary.org/obo/REX_0000008 nuclear fusion reaction http://purl.obolibrary.org/obo/REX_0000025 nuclear reaction A reaction between two light nuclei resulting in the production of a nuclear species heavier than either initial nucleus. http://purl.obolibrary.org/obo/REX_0000009 radiative capture http://purl.obolibrary.org/obo/REX_0000010 capture Capture of a particle by a nucleus followed by immediate emission of gamma radiation. http://purl.obolibrary.org/obo/REX_0000010 capture http://purl.obolibrary.org/obo/REX_0000003 nuclear transformation A process in which an atomic or nuclear system acquires an additional particle. http://purl.obolibrary.org/obo/REX_0000011 nuclear transition http://purl.obolibrary.org/obo/REX_0000014 subatomic process For a nucleus a change from one quantized energy state into another or a nuclear transformation. http://purl.obolibrary.org/obo/REX_0000012 radioactive decay http://purl.obolibrary.org/obo/REX_0000004 nuclear decay Nuclear decay in which particles or electromagnetic radiation are emitted or the nucleus undergoes spontaneous fission or electron capture. http://purl.obolibrary.org/obo/REX_0000013 spontaneous fission http://purl.obolibrary.org/obo/REX_0000015 nuclear fission Nuclear fission which occurs without the addition of particles or energy to the nucleus. http://purl.obolibrary.org/obo/REX_0000015 nuclear fission http://purl.obolibrary.org/obo/REX_0000003 nuclear transformation The division of a nucleus into two or more parts with masses of equal order of magnitude, usually accompanied by the emission of neutrons, gamma radiation and, rarely, small charged nuclear fragments. http://purl.obolibrary.org/obo/REX_0000016 thermal fission http://purl.obolibrary.org/obo/REX_0000024 induced fission Fission caused by thermal neutrons. http://purl.obolibrary.org/obo/REX_0000017 alpha-decay http://purl.obolibrary.org/obo/REX_0000012 radioactive decay Radioactive decay in which an alpha particle is emitted. http://purl.obolibrary.org/obo/REX_0000025 nuclear reaction http://purl.obolibrary.org/obo/REX_0000003 nuclear transformation A transformation of a nucleus which occurs (i) when another nuclear particle approaches closely enough to be influenced by the mutual attractive nuclear force between them or (ii) when affected by an electromagnetic force of sufficient strength. http://purl.obolibrary.org/obo/REX_0000026 excitation http://purl.obolibrary.org/obo/REX_0000166 microscopic process Process causing the transition of a system from one state to another of higher energy. http://purl.obolibrary.org/obo/REX_0000027 photoexcitation http://purl.obolibrary.org/obo/REX_0000026 excitation The production of an excited state by the absorption of ultraviolet, visible, or infrared radiation. http://purl.obolibrary.org/obo/REX_0000028 electron transfer http://purl.obolibrary.org/obo/REX_0000166 microscopic process The transfer of an electron from one molecular entity to another, or between two localized sites in the same molecular entity. http://purl.obolibrary.org/obo/REX_0000029 outer-sphere electron transfer http://purl.obolibrary.org/obo/REX_0000028 electron transfer A reaction in which the electron transfer takes place with no or very weak (4-16 kJ/mol) electronic interaction between the reactants in the transition state. http://purl.obolibrary.org/obo/REX_0000030 inner-sphere electron transfer http://purl.obolibrary.org/obo/REX_0000028 electron transfer A reaction in which the electron transfer takes place with significant (>20 kJ/mol) electronic interaction between the donor and acceptor centres in the transition state. http://purl.obolibrary.org/obo/REX_0000031 photoinduced electron transfer http://purl.obolibrary.org/obo/REX_0000033 photochemical reaction An electron transfer resulting from an electronic state produced by the resonant interaction of electromagnetic radiation with matter. http://purl.obolibrary.org/obo/REX_0000032 photophysical process http://purl.obolibrary.org/obo/REX_0000166 microscopic process Photoexcitation and subsequent events which lead from one to another state of a molecular entity through radiation and radiationless transitions. No chemical change results. http://purl.obolibrary.org/obo/REX_0000033 photochemical reaction http://purl.obolibrary.org/obo/REX_0000002 chemical reaction A chemical reaction caused by absorption of ultraviolet, visible, or infrared radiation. http://purl.obolibrary.org/obo/REX_0000034 photolysis http://purl.obolibrary.org/obo/REX_0000033 photochemical reaction The cleavage of one or more covalent bonds in a molecular entity resulting from absorption of light. http://purl.obolibrary.org/obo/REX_0000035 photoionization http://purl.obolibrary.org/obo/REX_0000152 ionization Ionization of any species by photons. http://purl.obolibrary.org/obo/REX_0000036 photocatalysis http://purl.obolibrary.org/obo/REX_0000078 catalysis Catalytic reaction involving light absorption by a catalyst or by a substrate. http://purl.obolibrary.org/obo/REX_0000037 photoassisted catalysis http://purl.obolibrary.org/obo/REX_0000036 photocatalysis Catalytic reaction involving production of a catalyst by absorption of light. http://purl.obolibrary.org/obo/REX_0000038 photoluminescence http://purl.obolibrary.org/obo/REX_0000290 luminescence Luminescence arising from photoexcitation. http://purl.obolibrary.org/obo/REX_0000039 excitation energy transfer http://purl.obolibrary.org/obo/REX_0000032 photophysical process A photophysical process in which an excited state of one molecular entity (the donor) is deactivated to a lower-lying state by transferring energy to a second molecular entity (the acceptor) which is thereby raised to a higher energy state. http://purl.obolibrary.org/obo/REX_0000040 radiative energy transfer http://purl.obolibrary.org/obo/REX_0000039 excitation energy transfer Transfer of excitation energy by radiative deactivation of a donor molecular entity and reabsorption of the emitted light by an acceptor molecular entity. http://purl.obolibrary.org/obo/REX_0000041 Forster excitation transfer http://purl.obolibrary.org/obo/REX_0000039 excitation energy transfer A mechanism of excitation transfer which can occur between molecular entities separated by distances considerably exceeding the sum of their van der Waals radii. http://purl.obolibrary.org/obo/REX_0000042 Dexter excitation transfer http://purl.obolibrary.org/obo/REX_0000039 excitation energy transfer Excitation transfer occurring as a result of an electron exchange mechanism. It requires an overlap of the wavefunctions of the energy donor and the energy acceptor. http://purl.obolibrary.org/obo/REX_0000043 fluorescence http://purl.obolibrary.org/obo/REX_0000038 photoluminescence Luminescence which occurs essentially only during the irradiation of a substance by electromagnetic radiation. http://purl.obolibrary.org/obo/REX_0000044 phosphorescence http://purl.obolibrary.org/obo/REX_0000038 photoluminescence Luminescence involving change in spin multiplicity. http://purl.obolibrary.org/obo/REX_0000045 photoreduction http://purl.obolibrary.org/obo/REX_0000033 photochemical reaction Reduction reactions induced by light. http://purl.obolibrary.org/obo/REX_0000046 atomic fluorescence http://purl.obolibrary.org/obo/REX_0000043 fluorescence A combined process of photon absorption by an atom followed by spontaneous photon emission. http://purl.obolibrary.org/obo/REX_0000047 photooxidation http://purl.obolibrary.org/obo/REX_0000033 photochemical reaction Oxidation reactions induced by light. http://purl.obolibrary.org/obo/REX_0000050 photooxygenation http://purl.obolibrary.org/obo/REX_0000047 photooxidation The incorporation of molecular oxygen into a molecular entity induced by light. http://purl.obolibrary.org/obo/REX_0000052 autocatalytic reaction http://purl.obolibrary.org/obo/REX_0000051 catalytic reaction A chemical reaction in which a product (or a reaction intermediate) also functions as a catalyst. http://purl.obolibrary.org/obo/REX_0000053 chain reaction http://purl.obolibrary.org/obo/REX_0000056 stepwise reaction A reaction in which one or more reactive reaction intermediates are continuously regenerated, usually through a repetitive cycle of elementary steps (the 'propagation step'). http://purl.obolibrary.org/obo/REX_0000054 electron-transfer induced chain reaction http://purl.obolibrary.org/obo/REX_0000053 chain reaction A sequence of reactions such as shown in equations [1]-[3], leading from A to B: [1] A + e- --> A.- ; [2] A.- --> B.- ; [3] B.- + A --> B + A.- ; an analogous sequence involving radical cations (A.+, B.+) is also observed. http://purl.obolibrary.org/obo/REX_0000055 elementary reaction http://purl.obolibrary.org/obo/REX_0000002 chemical reaction A reaction for which no reaction intermediates have been detected or need to be postulated in order to describe the chemical reaction on a molecular scale. http://purl.obolibrary.org/obo/REX_0000056 stepwise reaction http://purl.obolibrary.org/obo/REX_0000057 composite reaction A chemical reaction with at least one reaction intermediate and involving at least two consecutive elementary reactions. http://purl.obolibrary.org/obo/REX_0000057 composite reaction http://purl.obolibrary.org/obo/REX_0000002 chemical reaction A chemical reaction for which the expression for the rate of disappearance of a reactant (or rate of appearance of a product) involves rate constants of more than a single elementary reaction. http://purl.obolibrary.org/obo/REX_0000058 reaction step http://purl.obolibrary.org/obo/REX_0000055 elementary reaction An elementary reaction, constituting one of the stages of a stepwise reaction in which a reaction intermediate (or, for the first step, the reactants) is converted into the next reaction intermediate (or, for the last step, the products) in the sequence of intermediates between reactants and products. http://purl.obolibrary.org/obo/REX_0000060 chain initiation http://purl.obolibrary.org/obo/REX_0000059 chain reaction step A reaction or process generating free radicals (or some other reactive reaction intermediates) which then induce a chain reaction. http://purl.obolibrary.org/obo/REX_0000061 chain branching http://purl.obolibrary.org/obo/REX_0000059 chain reaction step When in a chain reaction there is a net increase in the number of chain carriers there is said to be chain branching. http://purl.obolibrary.org/obo/REX_0000062 degenerate chain branching http://purl.obolibrary.org/obo/REX_0000061 chain branching Sometimes chain branching is brought about by an intermediate which has a long lifetime compared with an ordinary free radical. If this intermediate can break down in different ways, only one of which leads to branching, there may be a relatively slow increase in the number of radicals, and there is said to be degenerate chain branching. http://purl.obolibrary.org/obo/REX_0000063 chain termination http://purl.obolibrary.org/obo/REX_0000059 chain reaction step The steps in a chain reaction in which reactive intermediates are destroyed or rendered inactive, thus ending the chain. http://purl.obolibrary.org/obo/REX_0000064 chain propagation http://purl.obolibrary.org/obo/REX_0000059 chain reaction step An elementary step in a chain reaction in which one chain carrier is converted into another. The conversion can be a unimolecular reaction or a bimolecular reaction with a reactant molecule. http://purl.obolibrary.org/obo/REX_0000065 branching chain reaction http://purl.obolibrary.org/obo/REX_0000053 chain reaction A chain reaction which includes a propagation step or steps in which there is an increase in the number of active intermediates. http://purl.obolibrary.org/obo/REX_0000066 rate-controlling step http://purl.obolibrary.org/obo/REX_0000058 reaction step An elementary reaction the rate constant for which exerts a strong effect - stronger than that of any other rate constant - on the overall rate. http://purl.obolibrary.org/obo/REX_0000067 product-determining step http://purl.obolibrary.org/obo/REX_0000058 reaction step The step of a stepwise reaction, in which the product distribution is determined. The product-determining step may be identical to, or occur later than, the rate-controlling step on the reaction coordinate. http://purl.obolibrary.org/obo/REX_0000069 parallel reactions http://purl.obolibrary.org/obo/REX_0000057 composite reaction Composite reactions, in which processes like A --> Y and B --> Z occur in parallel. http://purl.obolibrary.org/obo/REX_0000070 opposing reactions http://purl.obolibrary.org/obo/REX_0000057 composite reaction Composite reactions, occurring in forward and reverse directions: A + B <=> Z. http://purl.obolibrary.org/obo/REX_0000079 general acid catalysis http://purl.obolibrary.org/obo/REX_0000078 catalysis The catalysis of a chemical reaction by a series of Bronsted acids HA (which may include the solvated hydrogen ion). The acids HA are unchanged by the overall reaction. http://purl.obolibrary.org/obo/REX_0000080 general base catalysis http://purl.obolibrary.org/obo/REX_0000078 catalysis The catalysis of a chemical reaction by a series of Bronsted bases (which may include the lyate ion). http://purl.obolibrary.org/obo/REX_0000081 specific catalysis http://purl.obolibrary.org/obo/REX_0000078 catalysis The acceleration of a reaction by a unique catalyst, rather than by a family of related substances. http://purl.obolibrary.org/obo/REX_0000082 homogeneous catalysis http://purl.obolibrary.org/obo/REX_0000078 catalysis Catalysis in which only one phase is involved. http://purl.obolibrary.org/obo/REX_0000083 heterogeneous catalysis http://purl.obolibrary.org/obo/REX_0000206 surface process Catalysis occurring at or near an interface between phases. http://purl.obolibrary.org/obo/REX_0000085 thermal reaction http://purl.obolibrary.org/obo/REX_0000368 endothermic reaction A chemical reaction caused by absorption of thermal energy. http://purl.obolibrary.org/obo/REX_0000086 thermolysis http://purl.obolibrary.org/obo/REX_0000085 thermal reaction The uncatalysed cleavage of one or more covalent bonds resulting from exposure of a compound to a raised temperature, or a process in which such cleavage is an essential part. http://purl.obolibrary.org/obo/REX_0000088 substitution http://purl.obolibrary.org/obo/REX_0000087 transformation Transformation of the general type: AX + Y --> AY + X. http://purl.obolibrary.org/obo/REX_0000090 cycloaddition http://purl.obolibrary.org/obo/REX_0000433 pericyclic reaction A reaction in which two or more unsaturated molecules (or parts of the same molecule) combine with the formation of a cyclic adduct in which there is a net reduction of the bond multiplicity. http://purl.obolibrary.org/obo/REX_0000091 alpha-addition http://purl.obolibrary.org/obo/REX_0000427 addition reaction A chemical reaction resulting in a single reaction product from two or three reacting chemical species, with formation of two new chemical bonds to the same atom in one of the reactant molecular entities. http://purl.obolibrary.org/obo/REX_0000092 elimination http://purl.obolibrary.org/obo/REX_0000087 transformation In an elimination two groups (called eliminands) are lost most often from two different centres (1/2/elimination or 1/3/elimination, etc.) with concomitant formation of an unsaturation in the molecule (double bond, triple bond) or formation of a new ring. http://purl.obolibrary.org/obo/REX_0000093 alpha-elimination http://purl.obolibrary.org/obo/REX_0000092 elimination A transformation of the general type: R-Z(X)(Y)-R' --> R-Z-R' + XY [or X + Y, or X(+) + X(-)] http://purl.obolibrary.org/obo/REX_0000095 intramolecular rearrangement http://purl.obolibrary.org/obo/REX_0000094 rearrangement In the intramolecular rearrangement, the atoms and groups that are common to a reactant and a product never separate into independent fragments during the rearrangement stage. http://purl.obolibrary.org/obo/REX_0000096 intermolecular rearrangement http://purl.obolibrary.org/obo/REX_0000094 rearrangement In an intermolecular rearrangement, a migrating group is completely free from the parent molecule and is re-attached to a different position in a subsequent step. http://purl.obolibrary.org/obo/REX_0000097 degenerate rearrangement http://purl.obolibrary.org/obo/REX_0000094 rearrangement A molecular rearrangement in which the principal product is indistinguishable (in the absence of isotopic labelling) from the principal reactant. http://purl.obolibrary.org/obo/REX_0000098 isomerization http://purl.obolibrary.org/obo/REX_0000087 transformation A chemical reaction, the principal product of which is isomeric with the principal reactant. http://purl.obolibrary.org/obo/REX_0000099 insertion http://purl.obolibrary.org/obo/REX_0000087 transformation A chemical reaction or transformation of the general type: X-Z + Y --> X-Y-Z, in which the connecting atom or group Y replaces the bond joining the parts X and Z of the reactant XZ. http://purl.obolibrary.org/obo/REX_0000100 extrusion http://purl.obolibrary.org/obo/REX_0000087 transformation A transformation in which an atom or group Y connected to two other atoms or groups X and Z is lost from a molecule, leading to a product in which X is bonded to Z, e.g. X-Y-Z --> X-Z + Y. http://purl.obolibrary.org/obo/REX_0000101 cheletropic reaction http://purl.obolibrary.org/obo/REX_0000090 cycloaddition A form of cycloaddition across the terminal atoms of a fully conjugated system with formation of two new sigma-bonds to a single atom of the ('monocentric') reagent. There is formal loss of one pi-bond in the substrate and an increase in coordination number of the relevant atom of the reagent. http://purl.obolibrary.org/obo/REX_0000107 oxidoreductase reaction http://purl.obolibrary.org/obo/REX_0000405 redox reaction Enzymatic redox reaction. http://purl.obolibrary.org/obo/REX_0000115 nucleoside-triphosphatase reaction http://purl.obolibrary.org/obo/REX_0000117 nucleoside triphosphate (di)phosphohydrolase reaction NTP + H2O --> NDP + phosphate http://purl.obolibrary.org/obo/REX_0000116 nucleoside-triphosphate diphosphatase reaction http://purl.obolibrary.org/obo/REX_0000117 nucleoside triphosphate (di)phosphohydrolase reaction NTP + H2O --> NMP + diphosphate http://purl.obolibrary.org/obo/REX_0000120 active transport http://purl.obolibrary.org/obo/REX_0000457 biological membrane transport The carriage of a solute across a biological membrane from low to high concentration which requires the expenditure of (metabolic) energy. http://purl.obolibrary.org/obo/REX_0000121 facilitated diffusion http://purl.obolibrary.org/obo/REX_0000457 biological membrane transport Diffusion across a biological membrane through the participation of specific transporting agents (transporters) or carriers. http://purl.obolibrary.org/obo/REX_0000122 simple diffusion http://purl.obolibrary.org/obo/REX_0000173 diffusion A diffusion across a membrane in the absence of any specific transporting agent or carrier. http://purl.obolibrary.org/obo/REX_0000133 antiport http://purl.obolibrary.org/obo/REX_0000124 secondary active transport The process of coupled solute translocation in which two solutes equilibrate across an osmotic barrier, the translocation of solute being coupled to the translocation of the other in the opposite direction. http://purl.obolibrary.org/obo/REX_0000134 symport http://purl.obolibrary.org/obo/REX_0000124 secondary active transport The process of solute translocation in which two solutes equilibrate across an osmotic barrier, and the translocation of one solute is coupled to the translocation of the other in the same direction. http://purl.obolibrary.org/obo/REX_0000136 group translocation http://purl.obolibrary.org/obo/REX_0000457 biological membrane transport Any process in which a substance to be transported across a biological membrane undergoes covalent modification prior crossing the membrane. http://purl.obolibrary.org/obo/REX_0000141 solvation http://purl.obolibrary.org/obo/REX_0000167 macroscopic process Any stabilizing interaction of a solute (or solute moiety) and the solvent or a similar interaction of solvent with groups of an insoluble material. http://purl.obolibrary.org/obo/REX_0000142 coordination http://purl.obolibrary.org/obo/REX_0000148 attachment The formation of a covalent bond, the two shared electrons of which have come from only one of the two parts of the molecular entity linked by it, as in the reaction of a Lewis acid and a Lewis base to form a Lewis adduct. http://purl.obolibrary.org/obo/REX_0000143 unimolecular heterolysis http://purl.obolibrary.org/obo/REX_0000147 heterolysis The cleavage of a covalent bond so that both bonding electrons remain with one of the two fragments between which the bond is broken (A:B --> A + :B). http://purl.obolibrary.org/obo/REX_0000144 colligation http://purl.obolibrary.org/obo/REX_0000148 attachment The formation of a covalent bond by the combination or recombination of two radicals (A. + .B -> A:B). http://purl.obolibrary.org/obo/REX_0000145 unimolecular homolysis http://purl.obolibrary.org/obo/REX_0000146 homolysis A unimolecular reaction involving homolysis of a bond (not forming part of a cyclic structure) in a molecular entity containing an even number of (paired) electrons results in the formation of two radicals (A:B --> A. + .B). http://purl.obolibrary.org/obo/REX_0000148 attachment http://purl.obolibrary.org/obo/REX_0000150 association A transformation by which one molecular entity (the substrate) is converted into another by the formation of one (and only one) two-centre bond between the substrate and another molecular entity and which involves no other changes in connectivity in the substrate. http://purl.obolibrary.org/obo/REX_0000149 detachment http://purl.obolibrary.org/obo/REX_0000151 dissociation The reverse of an attachment. http://purl.obolibrary.org/obo/REX_0000150 association http://purl.obolibrary.org/obo/REX_0000087 transformation The assembling of separate molecular entities into any aggregate, especially of oppositely charged free ions into ion pairs or larger and not necessarily well-defined clusters of ions held together by electrostatic attraction. http://purl.obolibrary.org/obo/REX_0000151 dissociation http://purl.obolibrary.org/obo/REX_0000087 transformation The separation of a molecular entity into two or more molecular entities (or any similar separation within a polyatomic molecular entity). http://purl.obolibrary.org/obo/REX_0000152 ionization http://purl.obolibrary.org/obo/REX_0000087 transformation The generation of one or more ions. It may occur, e.g. by loss of an electron from a neutral molecular entity, by the unimolecular heterolysis of such an entity into two or more ions, or by a heterolytic substitution reaction involving neutral molecules. http://purl.obolibrary.org/obo/REX_0000153 electron attachment http://purl.obolibrary.org/obo/REX_0000048 electronation The transfer of an electron to a molecular entity, resulting in a molecular entity of (algebraically) increased negative charge. http://purl.obolibrary.org/obo/REX_0000154 electron detachment http://purl.obolibrary.org/obo/REX_0000049 de-electronation The reverse of an electron attachment. http://purl.obolibrary.org/obo/REX_0000156 spin-allowed electronic transition http://purl.obolibrary.org/obo/REX_0000155 electronic transition An electronic transition which does not involve a change in the spin part of the wavefunction. http://purl.obolibrary.org/obo/REX_0000157 vibronic transition http://purl.obolibrary.org/obo/REX_0000155 electronic transition A transition which involves a change in both the electronic and vibrational quantum numbers of a molecular entity, as opposed to purely electronic or purely vibrational transitions. http://purl.obolibrary.org/obo/REX_0000158 charge-transfer transition http://purl.obolibrary.org/obo/REX_0000155 electronic transition An electronic transition in which a large fraction of an electronic charge is transferred from one region of a molecular entity, called the electron donor, to another, called the electron acceptor (intramolecular CT) or from one molecular entity to another (intermolecular CT). http://purl.obolibrary.org/obo/REX_0000159 pi-sigma* transition http://purl.obolibrary.org/obo/REX_0000155 electronic transition An electronic transition described approximately as a promotion of an electron from a 'bonding' pi orbital to an 'antibonding' sigma orbital designated as sigma*. Such transitions generally involve high transition energies and appear close to or mixed with Rydberg transitions. http://purl.obolibrary.org/obo/REX_0000160 sigma-sigma* transition http://purl.obolibrary.org/obo/REX_0000155 electronic transition An electronic transition described approximately as promotion of an electron from a 'bonding' sigma orbital to an 'antibonding' sigma orbital designated as sigma*. Such transitions generally involve high transition energies, and appear close to or mixed with Rydberg transitions. http://purl.obolibrary.org/obo/REX_0000161 ligand to metal charge transfer transition http://purl.obolibrary.org/obo/REX_0000158 charge-transfer transition An electronic transition in a metal complex that corresponds to excitation populating an electronic state in which considerable electron transfer from a ligand to a metal centre has occurred. http://purl.obolibrary.org/obo/REX_0000162 metal to ligand charge transfer transition http://purl.obolibrary.org/obo/REX_0000158 charge-transfer transition An electronic transition of a metal complex that corresponds to excitation populating an electronic state in which considerable electron transfer from the metal to a ligand has occurred. http://purl.obolibrary.org/obo/REX_0000163 metal to metal charge transfer transition http://purl.obolibrary.org/obo/REX_0000158 charge-transfer transition An electronic transition of a bi- or polynuclear metal complex that corresponds to excitation populating an electronic state in which considerable electron transfer between two metal centres has occurred. http://purl.obolibrary.org/obo/REX_0000164 intervalence charge transfer http://purl.obolibrary.org/obo/REX_0000028 electron transfer Electron transfer (thermal or photoinduced) between two metal sites differing only in oxidation state. Quite often such electron transfer reverses the oxidation states of the sites. The term is frequently extended to the case of metal-to-metal charge transfer between non-equivalent metal centres. http://purl.obolibrary.org/obo/REX_0000165 Rydberg transition http://purl.obolibrary.org/obo/REX_0000155 electronic transition An electronic transition described approximately as promotion of an electron from a 'bonding' orbital to a Rydberg orbital. http://purl.obolibrary.org/obo/REX_0000168 unimolecular reaction http://purl.obolibrary.org/obo/REX_0000055 elementary reaction A reaction with a molecularity of one. http://purl.obolibrary.org/obo/REX_0000169 bimolecular reaction http://purl.obolibrary.org/obo/REX_0000055 elementary reaction A reaction with a molecularity of two. http://purl.obolibrary.org/obo/REX_0000170 termolecular reaction http://purl.obolibrary.org/obo/REX_0000055 elementary reaction A reaction with a molecularity of three. http://purl.obolibrary.org/obo/REX_0000171 phase transition http://purl.obolibrary.org/obo/REX_0000167 macroscopic process A change in the nature of a phase or in the number of phases as a result of some variation in externally imposed conditions, such as temperature, pressure, activity of a component or a magnetic, electric or stress field. http://purl.obolibrary.org/obo/REX_0000172 magnetic transition http://purl.obolibrary.org/obo/REX_0000171 phase transition A transition between disordered and ordered arrays of atomic magnetic moments. http://purl.obolibrary.org/obo/REX_0000173 diffusion http://purl.obolibrary.org/obo/REX_0000458 transport The spreading or scattering of a gaseous or liquid material. http://purl.obolibrary.org/obo/REX_0000174 microscopic chemical event http://purl.obolibrary.org/obo/REX_0000166 microscopic process A process that results in the interconversion of molecular entities. http://purl.obolibrary.org/obo/REX_0000175 mesomorphic transition http://purl.obolibrary.org/obo/REX_0000171 phase transition A transition that occurs between a fully-ordered crystalline solid and an isotropic liquid. Mesomorphic transitions can occur (i) from a crystal to a liquid crystal (ii) from a liquid crystal to another liquid crystal and (iii) from a liquid crystal to an isotropic liquid. http://purl.obolibrary.org/obo/REX_0000176 polymorphic transition http://purl.obolibrary.org/obo/REX_0000171 phase transition A reversible transition of a solid crystalline phase at a certain temperature and pressure (the inversion point) to another phase of the same chemical composition with a different crystal structure. http://purl.obolibrary.org/obo/REX_0000177 melting http://purl.obolibrary.org/obo/REX_0000171 phase transition The conversion of a solid to a liquid by the application of heat and/or pressure. http://purl.obolibrary.org/obo/REX_0000178 evaporation http://purl.obolibrary.org/obo/REX_0000372 endothermic process The physical process by which a liquid substance is converted to a gas or vapour. http://purl.obolibrary.org/obo/REX_0000179 crystallization http://purl.obolibrary.org/obo/REX_0000171 phase transition The formation of a crystalline solid from a solution, melt vapour or a different solid phase, generally by the lowering of the temperature or by evaporation of a solvent. http://purl.obolibrary.org/obo/REX_0000180 sublimation http://purl.obolibrary.org/obo/REX_0000171 phase transition The direct transition of a solid to a vapour without passing through a liquid phase. http://purl.obolibrary.org/obo/REX_0000181 interphase transition http://purl.obolibrary.org/obo/REX_0000171 phase transition A transition that occurs at boundaries between phases. http://purl.obolibrary.org/obo/REX_0000182 precipitation http://purl.obolibrary.org/obo/REX_0000181 interphase transition The sedimentation of a solid material (a precipitate) from a liquid solution in which the material is present in amounts greater than its solubility in the liquid. http://purl.obolibrary.org/obo/REX_0000183 nucleation and growth http://purl.obolibrary.org/obo/REX_0000171 phase transition A process in a phase transition in which nuclei of a new phase are first formed, followed by the propagation of the new phase at a faster rate. http://purl.obolibrary.org/obo/REX_0000184 discontinuous precipitation http://purl.obolibrary.org/obo/REX_0000183 nucleation and growth A diffusional reaction in a multi-component system in which structural and compositional changes occur in regions immediately adjacent to the advancing interface. The parent phase remains unchanged until swept over by the interface; the transition is complete in regions over which the interface has passed. http://purl.obolibrary.org/obo/REX_0000185 continuous precipitation http://purl.obolibrary.org/obo/REX_0000183 nucleation and growth A diffusional reaction in a multi-component system in which atoms are transported to the growing nuclei by diffusion over relatively large distances in the parent phase and during which the mean composition of the parent phase changes continuously towards its equilibrium value. http://purl.obolibrary.org/obo/REX_0000186 agglomeration http://purl.obolibrary.org/obo/REX_0000181 interphase transition The formation and growth of aggregates ultimately leading to phase separation by the formation of precipitates of larger than colloidal size. http://purl.obolibrary.org/obo/REX_0000187 micellar solubilization http://purl.obolibrary.org/obo/REX_0000181 interphase transition In a system formed by a solvent, an association colloid and at least one other component (the solubilizate), the incorporation of this other component into or on the micelles. http://purl.obolibrary.org/obo/REX_0000188 absorption http://purl.obolibrary.org/obo/REX_0000167 macroscopic process The process of one material (absorbent) being retained by another (absorbate). http://purl.obolibrary.org/obo/REX_0000189 sol-gel transition http://purl.obolibrary.org/obo/REX_0000171 phase transition The transition of a suspension of solid particles in a liquid (sol) to an apparent solid, jelly-like material (gel). http://purl.obolibrary.org/obo/REX_0000190 nucleation http://purl.obolibrary.org/obo/REX_0000181 interphase transition The process by which nuclei are formed in solution. http://purl.obolibrary.org/obo/REX_0000191 homogeneous nucleation http://purl.obolibrary.org/obo/REX_0000190 nucleation The condensation of a single chemical compound in solution. http://purl.obolibrary.org/obo/REX_0000192 simultaneous nucleation http://purl.obolibrary.org/obo/REX_0000190 nucleation The simultaneous condensation of more than one compound in solution. http://purl.obolibrary.org/obo/REX_0000193 heterogeneous nucleation http://purl.obolibrary.org/obo/REX_0000190 nucleation The condensation of a compound in solution on a foreign substance. http://purl.obolibrary.org/obo/REX_0000194 electrode process http://purl.obolibrary.org/obo/REX_0000213 electrochemical reaction The totality of changes occurring at or near a single electrode during the passage of current. http://purl.obolibrary.org/obo/REX_0000196 adiabatic electron transfer http://purl.obolibrary.org/obo/REX_0000028 electron transfer Electron transfer process in which the reacting system remains on a single electronic surface in passing from reactants to products. http://purl.obolibrary.org/obo/REX_0000197 diabatic electron transfer http://purl.obolibrary.org/obo/REX_0000028 electron transfer Electron transfer process in which the reacting system has to cross over between different electronic surfaces in passing from reactants to products. http://purl.obolibrary.org/obo/REX_0000198 adsorption http://purl.obolibrary.org/obo/REX_0000206 surface process An increase in the concentration of a dissolved substance at the interface of a condensed and a liquid phase due to the operation of surface forces. Adsorption can also occur at the interface of a condensed and a gaseous phase. http://purl.obolibrary.org/obo/REX_0000200 desorption (by displacement) http://purl.obolibrary.org/obo/REX_0000199 desorption The process in which expulsion of a previously adsorbed component from the interfacial layer is effected by subsequent stronger adsorption of another component. http://purl.obolibrary.org/obo/REX_0000201 dissociative adsorption http://purl.obolibrary.org/obo/REX_0000208 chemisorption Adsorption with dissociation into two or more fragments, both or all of which are bound to the surface of the adsorbent. http://purl.obolibrary.org/obo/REX_0000203 reactive adsorption http://purl.obolibrary.org/obo/REX_0000208 chemisorption Reactive adsorption (and its reverse, reactive desorption) resembles dissociative adsorption (and its reverse, associative desorption) but one fragment adds to an adsorbate rather than to a surface site. http://purl.obolibrary.org/obo/REX_0000204 reactive desorption http://purl.obolibrary.org/obo/REX_0000199 desorption Reverse of reactive adsorption. http://purl.obolibrary.org/obo/REX_0000207 physisorption http://purl.obolibrary.org/obo/REX_0000198 adsorption Adsorption in which the forces involved are intermolecular forces (van der Waals forces) of the same kind as those responsible for the imperfection of real gases and the condensation vapours, and which do not involve a significant change in the electronic orbital patterns of the species involved. http://purl.obolibrary.org/obo/REX_0000208 chemisorption http://purl.obolibrary.org/obo/REX_0000198 adsorption Adsorption which results from chemical bond formation (strong interaction) between the adsorbent and the adsorbate in a monolayer on the surface. http://purl.obolibrary.org/obo/REX_0000209 charge-transfer adsorption http://purl.obolibrary.org/obo/REX_0000208 chemisorption Oxidative or reductive chemisorption where 'reductive' and 'oxidative' refer to electron gain or loss on species in the solid. http://purl.obolibrary.org/obo/REX_0000210 multilayer adsorption http://purl.obolibrary.org/obo/REX_0000198 adsorption Adsorption such that the adsorption space accommodates more than one layer of molecules, and not all adsorbed molecules are in contact with the surface layer of the adsorbent. http://purl.obolibrary.org/obo/REX_0000211 diabatic photoreaction http://purl.obolibrary.org/obo/REX_0000033 photochemical reaction Within the Born-Oppenheimer approximation, a reaction beginning on one excited state 'potential-energy surface' and ending, as a result of radiationless transition, on another surface, usually that of the ground state. http://purl.obolibrary.org/obo/REX_0000212 adiabatic photoreaction http://purl.obolibrary.org/obo/REX_0000033 photochemical reaction Within the Born-Oppenheimer approximation, a reaction of an excited state species that occurs on a single 'potential-energy surface'. http://purl.obolibrary.org/obo/REX_0000214 electrodeposition http://purl.obolibrary.org/obo/REX_0000194 electrode process The deposition of dissolved or suspended material by an electric field on an electrode. http://purl.obolibrary.org/obo/REX_0000216 micellar catalysis http://purl.obolibrary.org/obo/REX_0000083 heterogeneous catalysis The acceleration of a chemical reaction in solution by the addition of a surfactant at a concentration higher than its critical micelle concentration so that the reaction can proceed in the environment of surfactant aggregates (micelles). http://purl.obolibrary.org/obo/REX_0000217 nucleophilic catalysis http://purl.obolibrary.org/obo/REX_0000078 catalysis Catalysis by a Lewis base, involving formation of a Lewis adduct as a reaction intermediate. http://purl.obolibrary.org/obo/REX_0000218 inhibition http://purl.obolibrary.org/obo/REX_0000235 modification of reaction The decrease in rate of reaction brought about by the addition of a substance (inhibitor), by virtue of its effect on the concentration of a reactant, catalyst or reaction intermediate. http://purl.obolibrary.org/obo/REX_0000219 mechanism-based inhibition http://purl.obolibrary.org/obo/REX_0000234 irreversible enzyme inhibition Irreversible inhibition of an enzyme due to its catalysis of the reaction of an artificial substrate. http://purl.obolibrary.org/obo/REX_0000220 competitive inhibition http://purl.obolibrary.org/obo/REX_0000247 reversible inhibition of catalysis The reduction in rate due to reduction or loss of activity of a catalyst, caused by adsorption of poison which is not greatly preferred to adsorption of reactant. http://purl.obolibrary.org/obo/REX_0000222 chemical activation http://purl.obolibrary.org/obo/REX_0000221 activation When some of the energy required for a reaction is provided by a preceding exothermic chemical reaction there is said to be chemical activation. http://purl.obolibrary.org/obo/REX_0000223 activation of catalysis http://purl.obolibrary.org/obo/REX_0000221 activation An added substance that increases the rate of a catalysed reaction is known as an activator, and the effect is called activation. http://purl.obolibrary.org/obo/REX_0000231 essential activation http://purl.obolibrary.org/obo/REX_0000230 reversible enzyme activation In essential activation, the free enzyme without activator bound to it has no activity and does not bind substrate. http://purl.obolibrary.org/obo/REX_0000239 enzyme activation http://purl.obolibrary.org/obo/REX_0000238 modification of enzyme catalysis Any process leading to increase of enzymatic activity. http://purl.obolibrary.org/obo/REX_0000241 zymogen activation http://purl.obolibrary.org/obo/REX_0000240 irreversible enzyme activation Conversion of inactive precursors (zymogens) into active enzymes by limited proteolysis. http://purl.obolibrary.org/obo/REX_0000249 catalytic poisoning http://purl.obolibrary.org/obo/REX_0000248 irreversible inhibition of catalysis The action of catalytic poison. http://purl.obolibrary.org/obo/REX_0000250 temporary poisoning http://purl.obolibrary.org/obo/REX_0000247 reversible inhibition of catalysis Weak and reversible adsorption of a poison, such that removal of the poison from the fluid phase results in restoration of the original catalytic activity. http://purl.obolibrary.org/obo/REX_0000251 polymerization http://purl.obolibrary.org/obo/REX_0000056 stepwise reaction The process of converting a monomer or a mixture of monomers into a polymer. http://purl.obolibrary.org/obo/REX_0000252 condensation polymerization http://purl.obolibrary.org/obo/REX_0000251 polymerization Polymerization by a repeated condensation process. http://purl.obolibrary.org/obo/REX_0000253 condensation reaction http://purl.obolibrary.org/obo/REX_0000002 chemical reaction A (usually stepwise) reaction in which two or more reactants (or remote reactive sites within the same molecular entity) yield a single main product with accompanying formation of water or of some other small molecule, e.g. ammonia, ethanol, acetic acid, hydrogen sulfide. http://purl.obolibrary.org/obo/REX_0000254 ring-opening polymerization http://purl.obolibrary.org/obo/REX_0000251 polymerization A polymerization in which a cyclic monomer yields a monomeric unit which is acyclic or contains fewer cycles than the monomer. http://purl.obolibrary.org/obo/REX_0000255 stereoselective polymerization http://purl.obolibrary.org/obo/REX_0000251 polymerization Polymerization in which a polymer molecule is formed from a mixture of stereoisomeric monomer molecules by incorporation of only one stereoisomeric species. http://purl.obolibrary.org/obo/REX_0000256 chain polymerization http://purl.obolibrary.org/obo/REX_0000251 polymerization A chain reaction in which the growth of a polymer chain proceeds exclusively by reaction(s) between monomer(s) and reactive site(s) on the polymer chain with regeneration of the reactive site(s) at the end of each growth step. http://purl.obolibrary.org/obo/REX_0000257 condensative chain polymerization http://purl.obolibrary.org/obo/REX_0000256 chain polymerization Chain polymerization occurring with the formation of small molecules. http://purl.obolibrary.org/obo/REX_0000258 chain transfer http://purl.obolibrary.org/obo/REX_0000063 chain termination The abstraction, by the radical end of a growing chain-polymer, of an atom from another molecule. The growth of the polymer chain is thereby terminated but a new radical, capable of chain propagation and polymerization, is simultaneously created. http://purl.obolibrary.org/obo/REX_0000259 ionic polymerization http://purl.obolibrary.org/obo/REX_0000256 chain polymerization A chain polymerization in which the kinetic-chain carriers are ions or ion pairs. http://purl.obolibrary.org/obo/REX_0000260 radical polymerization http://purl.obolibrary.org/obo/REX_0000256 chain polymerization A chain polymerization in which the kinetic-chain carriers are radicals. http://purl.obolibrary.org/obo/REX_0000261 living polymerization http://purl.obolibrary.org/obo/REX_0000256 chain polymerization A chain polymerization from which chain transfer and chain termination are absent. http://purl.obolibrary.org/obo/REX_0000262 anionic polymerization http://purl.obolibrary.org/obo/REX_0000259 ionic polymerization An ionic polymerization in which the kinetic-chain carriers are anions. http://purl.obolibrary.org/obo/REX_0000263 cationic polymerization http://purl.obolibrary.org/obo/REX_0000259 ionic polymerization An ionic polymerization in which the kinetic-chain carriers are cations. http://purl.obolibrary.org/obo/REX_0000264 photoinduced polymerization http://purl.obolibrary.org/obo/REX_0000251 polymerization The polymerization of a monomer by a free radical or ionic chain reaction initiated by photoexcitation. http://purl.obolibrary.org/obo/REX_0000265 photoinitiation http://purl.obolibrary.org/obo/REX_0000060 chain initiation The photoproduction of a free radical or ion capable of initiating a chain reaction such as a polymerization. http://purl.obolibrary.org/obo/REX_0000266 polyaddition http://purl.obolibrary.org/obo/REX_0000251 polymerization A polymerization in which the growth of polymer chains proceeds by addition reactions between molecules of all degrees of polymerization. http://purl.obolibrary.org/obo/REX_0000267 photopolymerization http://purl.obolibrary.org/obo/REX_0000251 polymerization Polymerization processes requiring a photon for the propagation step. http://purl.obolibrary.org/obo/REX_0000268 cyclopolymerization http://purl.obolibrary.org/obo/REX_0000251 polymerization A polymerization in which the number of cyclic structures in the constitutional units of the resulting macromolecules is larger than in the monomer molecules. http://purl.obolibrary.org/obo/REX_0000269 homopolymerization http://purl.obolibrary.org/obo/REX_0000251 polymerization Polymerization in which a homopolymer is formed. http://purl.obolibrary.org/obo/REX_0000270 copolymerization http://purl.obolibrary.org/obo/REX_0000251 polymerization Polymerization in which a copolymer is formed. http://purl.obolibrary.org/obo/REX_0000271 graft copolymerization http://purl.obolibrary.org/obo/REX_0000270 copolymerization Polymerization in which a graft copolymer is formed. http://purl.obolibrary.org/obo/REX_0000272 ring-opening copolymerization http://purl.obolibrary.org/obo/REX_0000270 copolymerization A copolymerization which is a ring-opening polymerization with respect to at least one monomer. http://purl.obolibrary.org/obo/REX_0000273 ionic copolymerization http://purl.obolibrary.org/obo/REX_0000270 copolymerization A copolymerization which is an ionic polymerization. http://purl.obolibrary.org/obo/REX_0000274 living copolymerization http://purl.obolibrary.org/obo/REX_0000270 copolymerization A copolymerization which is a living polymerization. http://purl.obolibrary.org/obo/REX_0000275 radical copolymerization http://purl.obolibrary.org/obo/REX_0000270 copolymerization A copolymerization which is a radical polymerization. http://purl.obolibrary.org/obo/REX_0000276 oligomerization http://purl.obolibrary.org/obo/REX_0000251 polymerization The process of converting a monomer or a mixture of monomers into an oligomer. http://purl.obolibrary.org/obo/REX_0000277 telomerization http://purl.obolibrary.org/obo/REX_0000256 chain polymerization The formation of an addition oligomer, having uniform end groups X' ... X'', by a chain reaction in which a chain transfer limits the length of the polymer ('telomer') produced. http://purl.obolibrary.org/obo/REX_0000278 photoadsorption http://purl.obolibrary.org/obo/REX_0000208 chemisorption Adsorption initiated by light absorbed either by the adsorbate or by the adsorbent. Often it is considered as a chemical step (primary) in a heterogeneous photocatalytic reaction. http://purl.obolibrary.org/obo/REX_0000279 photodesorption http://purl.obolibrary.org/obo/REX_0000199 desorption Desorption of an adsorbate as a result of exposure to light. http://purl.obolibrary.org/obo/REX_0000280 radiocatalysis http://purl.obolibrary.org/obo/REX_0000284 radiochemical reaction Catalysis occurring under the action of quanta of ionizing radiation absorbed by the radiocatalytic substance (radiocatalyst). http://purl.obolibrary.org/obo/REX_0000281 radiodesorption http://purl.obolibrary.org/obo/REX_0000284 radiochemical reaction Desorption of a substrate from solid or liquid interfaces induced by absorption of high-energy radiation by the solid or liquid adsorbent. http://purl.obolibrary.org/obo/REX_0000282 radioadsorption http://purl.obolibrary.org/obo/REX_0000284 radiochemical reaction Adsorption of a substance at solid or liquid interfaces induced by absorption of high-energy radiation by the solid or liquid adsorbent. http://purl.obolibrary.org/obo/REX_0000283 radiothermal catalysis http://purl.obolibrary.org/obo/REX_0000386 thermocatalysis Radiocatalysis under the action of large radiation fluxes that simultaneously heat the system as a consequence of the absorption of radiation energy. http://purl.obolibrary.org/obo/REX_0000284 radiochemical reaction http://purl.obolibrary.org/obo/REX_0000002 chemical reaction A chemical reaction caused by absorption of high-energy radiation. http://purl.obolibrary.org/obo/REX_0000285 radiolysis http://purl.obolibrary.org/obo/REX_0000284 radiochemical reaction The cleavage of one or several bonds resulting from exposure to high-energy radiation. http://purl.obolibrary.org/obo/REX_0000286 autoradiolysis http://purl.obolibrary.org/obo/REX_0000285 radiolysis Radiolysis of a radioactive material resulting directly or indirectly from its radioactive decay. http://purl.obolibrary.org/obo/REX_0000287 isomeric transition http://purl.obolibrary.org/obo/REX_0000011 nuclear transition A spontaneous transition between two isomeric states of a nucleus. http://purl.obolibrary.org/obo/REX_0000288 electron-positron pair production http://purl.obolibrary.org/obo/REX_0000326 particle-antiparticle pair production The simultaneous formation of an electron and a positron as a result of the interaction of a photon of sufficient energy (> 1.02 MeV) with the field of a particle. http://purl.obolibrary.org/obo/REX_0000289 fast atom bombardment ionization http://purl.obolibrary.org/obo/REX_0000152 ionization Ionization of any species by causing interaction of the sample (which may be dissolved in a solvent matrix) and a beam of neutral atoms having high translational energy. http://purl.obolibrary.org/obo/REX_0000290 luminescence http://purl.obolibrary.org/obo/REX_0000303 emission Spontaneous emission of radiation from an electronically or vibrationally excited species not in thermal equilibrium with its environment. http://purl.obolibrary.org/obo/REX_0000291 radioluminescence http://purl.obolibrary.org/obo/REX_0000290 luminescence Luminescence arising from excitation by high energy particles or radiation. http://purl.obolibrary.org/obo/REX_0000292 delayed luminescence http://purl.obolibrary.org/obo/REX_0000290 luminescence Luminescence decaying more slowly than that expected from the rate of decay of the emitting state. http://purl.obolibrary.org/obo/REX_0000294 chemiluminescence http://purl.obolibrary.org/obo/REX_0000290 luminescence Emission of radiation resulting from a chemical reaction. http://purl.obolibrary.org/obo/REX_0000295 electrogenerated chemiluminescence http://purl.obolibrary.org/obo/REX_0000294 chemiluminescence Luminescence produced by electrode reactions. http://purl.obolibrary.org/obo/REX_0000296 triboluminescence http://purl.obolibrary.org/obo/REX_0000290 luminescence Luminescence resulting from the rubbing together of the surface of certain solids. http://purl.obolibrary.org/obo/REX_0000297 sonoluminescence http://purl.obolibrary.org/obo/REX_0000290 luminescence Luminescence induced by sound waves. http://purl.obolibrary.org/obo/REX_0000298 bioluminescence http://purl.obolibrary.org/obo/REX_0000294 chemiluminescence Luminescence produced by living systems. http://purl.obolibrary.org/obo/REX_0000299 thermoluminescence http://purl.obolibrary.org/obo/REX_0000294 chemiluminescence Luminescence arising from a reaction between species trapped in a rigid matrix and released as a result of an increase in temperature. http://purl.obolibrary.org/obo/REX_0000300 piezoluminescence http://purl.obolibrary.org/obo/REX_0000290 luminescence Luminescence observed when certain solids are subjected to a change in pressure. http://purl.obolibrary.org/obo/REX_0000301 deactivation http://purl.obolibrary.org/obo/REX_0000166 microscopic process Any loss of energy by an excited molecular entity. http://purl.obolibrary.org/obo/REX_0000302 radiationless deactivation http://purl.obolibrary.org/obo/REX_0000306 radiationless transition The loss of electronic excitation energy without photon emission or chemical change. http://purl.obolibrary.org/obo/REX_0000303 emission http://purl.obolibrary.org/obo/REX_0000301 deactivation Radiative deactivation of an excited state; transfer of energy from a molecular entity to an electromagnetic field. http://purl.obolibrary.org/obo/REX_0000304 intersystem crossing http://purl.obolibrary.org/obo/REX_0000302 radiationless deactivation An isoenergetic radiationless transition between two electronic states having different multiplicities. It often results in a vibrationally excited molecular entity in the lower electronic state, which then usually deactivates to its lowest vibrational level. http://purl.obolibrary.org/obo/REX_0000305 internal conversion (in photophysics) http://purl.obolibrary.org/obo/REX_0000302 radiationless deactivation An isoenenergetic radiationless transition between two electronic states of the same multiplicity. When the transition results in a vibrationally excited molecular entity in the lower electronic state, this usually undergoes deactivation to its lowest vibrational level, provided the final state is not unstable to dissociation. http://purl.obolibrary.org/obo/REX_0000306 radiationless transition http://purl.obolibrary.org/obo/REX_0000166 microscopic process A transition between two states of a system without photon emission or absorption. http://purl.obolibrary.org/obo/REX_0000307 radiative transition http://purl.obolibrary.org/obo/REX_0000166 microscopic process A transition between two states of a molecular entity, the energy difference being emitted or absorbed as photons. http://purl.obolibrary.org/obo/REX_0000308 E-type delayed fluorescence http://purl.obolibrary.org/obo/REX_0000312 E-type delayed luminescence The process in which the first excited singlet state becomes populated by a thermally activated radiationless transition from the first excited triplet state. Since in this case the populations of the singlet and triplet states are in thermal equilibrium, the lifetimes of delayed fluorescence and the concomitant phosphorescence are equal. http://purl.obolibrary.org/obo/REX_0000309 P-type delayed fluorescence http://purl.obolibrary.org/obo/REX_0000311 P-type delayed luminescence The process in which the first excited singlet state is populated by interaction of two molecules in the triplet state (triplet-triplet annihilation) thus producing one molecule in the excited singlet state. In this biphotonic process the lifetime of delayed fluorescence is half the value of the concomitant phosphorescence. http://purl.obolibrary.org/obo/REX_0000310 recombination fluorescence http://purl.obolibrary.org/obo/REX_0000293 delayed fluorescence The process in which the first excited singlet state becomes populated by recombination of radical ions with electrons or by recombination of radical ions of opposite charge. http://purl.obolibrary.org/obo/REX_0000311 P-type delayed luminescence http://purl.obolibrary.org/obo/REX_0000292 delayed luminescence Triplet-triplet or singlet-singlet annihilation to form one molecular entity in its excited singlet state and another molecular entity in its electronic ground state. http://purl.obolibrary.org/obo/REX_0000312 E-type delayed luminescence http://purl.obolibrary.org/obo/REX_0000292 delayed luminescence Thermally activated delayed fluorescence involving reversible intersystem crossing. http://purl.obolibrary.org/obo/REX_0000313 charge separation http://purl.obolibrary.org/obo/REX_0000166 microscopic process A process in which, under the influence of a suitable driving force (e.g. provided by photoexcitation), electronic charge moves in a direction that increases the difference in local charges between donor and acceptor sites. http://purl.obolibrary.org/obo/REX_0000315 ion pair dissociation http://purl.obolibrary.org/obo/REX_0000151 dissociation Separation of the constituents of an ion pair into free ions. http://purl.obolibrary.org/obo/REX_0000317 internal ion-pair return http://purl.obolibrary.org/obo/REX_0000320 primary geminate recombination If the ions are paired as a tight ion pair and recombine without prior separation into a loose ion pair this is called internal ion-pair return. http://purl.obolibrary.org/obo/REX_0000318 external ion-pair return http://purl.obolibrary.org/obo/REX_0000321 secondary geminate recombination If the ions are paired as a loose ion pair and form the covalent chemical species via a tight ion pair, this is called external ion-pair return. http://purl.obolibrary.org/obo/REX_0000319 geminate recombination http://purl.obolibrary.org/obo/REX_0000056 stepwise reaction The reaction of two transient species produced from a common precursor in solution with each other. http://purl.obolibrary.org/obo/REX_0000320 primary geminate recombination http://purl.obolibrary.org/obo/REX_0000319 geminate recombination Geminate recombination occurring before any separation of two transient species by diffusion has occurred. http://purl.obolibrary.org/obo/REX_0000321 secondary geminate recombination http://purl.obolibrary.org/obo/REX_0000319 geminate recombination If the mutually reactive entities have been separated, and come together by diffusion, this is termed secondary geminate recombination. http://purl.obolibrary.org/obo/REX_0000322 singlet-triplet energy transfer http://purl.obolibrary.org/obo/REX_0000039 excitation energy transfer Transfer of excitation from an electronically excited donor in a singlet state to produce an electronically excited acceptor in a triplet state. http://purl.obolibrary.org/obo/REX_0000323 excitation annihilation http://purl.obolibrary.org/obo/REX_0000039 excitation energy transfer Two atoms or molecular entities both in an excited electronic state interact often (usually upon collision) to produce one atom or molecular entity in an excited electronic state and another in its ground electronic state. http://purl.obolibrary.org/obo/REX_0000325 triplet-triplet annihilation http://purl.obolibrary.org/obo/REX_0000323 excitation annihilation Two atoms or molecular entities both in a triplet state often interact (usually upon collision) to produce one atom or molecular entity in an excited singlet state and another in its ground singlet state. This is often, but not always, followed by delayed fluorescence. http://purl.obolibrary.org/obo/REX_0000327 singlet-singlet absorption http://purl.obolibrary.org/obo/REX_0000027 photoexcitation Absorption which results in the transition from the singlet ground state of the molecule into singlet excited states and leads to the UV/visible absorption spectrum. http://purl.obolibrary.org/obo/REX_0000328 singlet-triplet absorption http://purl.obolibrary.org/obo/REX_0000027 photoexcitation Absorption which takes place with the transition from the singlet ground state of the molecule to triplet states and results in the singlet-triplet absorption spectrum. http://purl.obolibrary.org/obo/REX_0000329 photoabsorption http://purl.obolibrary.org/obo/REX_0000188 absorption The transfer of energy from an electromagnetic field to an entity (molecular or otherwise). http://purl.obolibrary.org/obo/REX_0000330 triplet-triplet absorption http://purl.obolibrary.org/obo/REX_0000027 photoexcitation Absorption which takes place with the transition from the lowest triplet state of the molecule to higher triplet states thus leading to the triplet-triplet absorption spectrum. http://purl.obolibrary.org/obo/REX_0000331 relaxation http://purl.obolibrary.org/obo/REX_0000167 macroscopic process If a system is disturbed from its state of equilibrium it relaxes to that state, and the process is referred to as relaxation. http://purl.obolibrary.org/obo/REX_0000332 two-photon excitation http://purl.obolibrary.org/obo/REX_0000027 photoexcitation Excitation resulting from successive or simultaneous absorption of two photons by an atom or molecular entity. http://purl.obolibrary.org/obo/REX_0000333 biphotonic excitation http://purl.obolibrary.org/obo/REX_0000332 two-photon excitation The simultaneous two-photon absorption. http://purl.obolibrary.org/obo/REX_0000337 mass transfer http://purl.obolibrary.org/obo/REX_0000458 transport Movement of material from one location in solution to another as might arise either from differences in electrical or chemical potential at the two locations, or from movement of a volume element of solution. http://purl.obolibrary.org/obo/REX_0000338 electrophoresis http://purl.obolibrary.org/obo/REX_0000337 mass transfer The motion of colloidal particles in an electric field. http://purl.obolibrary.org/obo/REX_0000345 chemical relaxation http://purl.obolibrary.org/obo/REX_0000331 relaxation If the equilibrium mixture of a chemical reaction is disturbed by a sudden change, especially of some external parameter (such as temperature, pressure or electrical field strength), the system will readjust itself to a new position of the chemical equilibrium or return to the original position, if the perturbation is temporary. The readjustment is known as chemical relaxation. http://purl.obolibrary.org/obo/REX_0000346 vibrational relaxation http://purl.obolibrary.org/obo/REX_0000331 relaxation The loss of vibrational excitation energy by a molecular entity through energy transfer to the environment caused by collisions. The molecular entity relaxes into vibrational equilibrium with its environment. http://purl.obolibrary.org/obo/REX_0000347 resonance fluorescence http://purl.obolibrary.org/obo/REX_0000043 fluorescence Fluorescence from the primary excited atomic or molecular species at the wavelength of the exciting radiation (no relaxation within the excited manifold). http://purl.obolibrary.org/obo/REX_0000348 scattering http://purl.obolibrary.org/obo/REX_0000167 macroscopic process A process in which a change in direction or energy of an incident radiation is caused by interaction with a particle, a system of particles, or a photon. http://purl.obolibrary.org/obo/REX_0000349 light scattering http://purl.obolibrary.org/obo/REX_0000348 scattering The redirection of a light beam due to interactions with molecules (Rayleigh and Raman scattering) and aerosols (Mie scattering). http://purl.obolibrary.org/obo/REX_0000350 elastic light scattering http://purl.obolibrary.org/obo/REX_0000364 elastic scattering Radiation may be scattered by its transmission through a medium containing particles. If the scatter results in no significant change in the wavelength relative to the primary radiation it is called elastic scattering. In cases where the scattering centres are small compared to the wavelength of the radiation the elastic scattering is called Rayleigh scattering and Mie scattering if this condition is not fulfilled. http://purl.obolibrary.org/obo/REX_0000351 Rayleigh scattering http://purl.obolibrary.org/obo/REX_0000350 elastic light scattering The scattering of light by particles and molecules which are much smaller than the wavelength of the light. In the ideal case, the process is one of pure dipole and induced dipole interactions with the electric field of the light wave. http://purl.obolibrary.org/obo/REX_0000352 Mie scattering http://purl.obolibrary.org/obo/REX_0000350 elastic light scattering The scattering of electromagnetic radiation by spherical particles of any size r, relative to the wavelength, lambda. http://purl.obolibrary.org/obo/REX_0000353 Compton scattering http://purl.obolibrary.org/obo/REX_0000350 elastic light scattering The elastic scattering of a photon by an electron which afterwards occurs as a free electron. Part of the energy and momentum of the incident photon is transferred to the electron and the remaining part is carried away by the scattered photon. http://purl.obolibrary.org/obo/REX_0000368 endothermic reaction http://purl.obolibrary.org/obo/REX_0000388 thermochemical reaction A reaction for which the overall standard enthalpy change is positive. http://purl.obolibrary.org/obo/REX_0000369 exothermic reaction http://purl.obolibrary.org/obo/REX_0000388 thermochemical reaction A reaction for which the overall standard enthalpy change is negative. http://purl.obolibrary.org/obo/REX_0000370 exergonic reaction http://purl.obolibrary.org/obo/REX_0000002 chemical reaction A reaction for which the overall standard Gibbs energy change is negative. http://purl.obolibrary.org/obo/REX_0000373 adiabatic process http://purl.obolibrary.org/obo/REX_0000167 macroscopic process A process occurring in a thermally insulated system, so that there is no flow of heat to or from the surroundings. http://purl.obolibrary.org/obo/REX_0000375 atom migration http://purl.obolibrary.org/obo/REX_0000374 migration The (usually intramolecular) transfer of an atom or group during the course of a molecular rearrangement. http://purl.obolibrary.org/obo/REX_0000376 bond migration http://purl.obolibrary.org/obo/REX_0000374 migration The movement of a bond to a new position within the same molecular entity. http://purl.obolibrary.org/obo/REX_0000377 migratory insertion http://purl.obolibrary.org/obo/REX_0000374 migration A combination of migration and insertion. The term is mainly used in organometallic chemistry. http://purl.obolibrary.org/obo/REX_0000378 postprecipitation http://purl.obolibrary.org/obo/REX_0000182 precipitation The subsequent precipitation of a chemically different species upon the surface of an initial precipitate usually, but not necessarily, including a common ion. http://purl.obolibrary.org/obo/REX_0000379 type I photooxygenation http://purl.obolibrary.org/obo/REX_0000050 photooxygenation The reaction of triplet molecular oxygen with radicals formed photochemically. http://purl.obolibrary.org/obo/REX_0000380 type II photooxygenation http://purl.obolibrary.org/obo/REX_0000050 photooxygenation The reaction of photochemically produced singlet molecular oxygen with molecular entities to give rise to oxygen containing molecular entities. http://purl.obolibrary.org/obo/REX_0000381 type III photooxygenation http://purl.obolibrary.org/obo/REX_0000050 photooxygenation The photooxygenation reaction proceeding by electron transfer to produce the superoxide radical anion as the reactive species. http://purl.obolibrary.org/obo/REX_0000382 photosensitized reaction http://purl.obolibrary.org/obo/REX_0000033 photochemical reaction A reaction initiated by photosensitization. http://purl.obolibrary.org/obo/REX_0000384 photothermocatalysis http://purl.obolibrary.org/obo/REX_0000386 thermocatalysis Catalysis occurring by the simultaneous or sequential action of light and thermal energy. http://purl.obolibrary.org/obo/REX_0000385 thermophotocatalysis http://purl.obolibrary.org/obo/REX_0000386 thermocatalysis A (photo)catalytic phenomenon that occurs in circumstances when the system is also heated by light. http://purl.obolibrary.org/obo/REX_0000386 thermocatalysis http://purl.obolibrary.org/obo/REX_0000085 thermal reaction Catalysis occurring by the action of thermal energy. http://purl.obolibrary.org/obo/REX_0000387 photoradiocatalysis http://purl.obolibrary.org/obo/REX_0000280 radiocatalysis Radiocatalysis taking place under the e?ect of the simultaneous action of quanta of light and ionizing radiation. There is also the case when the ionizing radiation alone causes the emission of light that is chemically active (e.g., as may occur in the Cherenkov light emission). http://purl.obolibrary.org/obo/REX_0000388 thermochemical reaction http://purl.obolibrary.org/obo/REX_0000002 chemical reaction A reaction which involves the enthalpy change. http://purl.obolibrary.org/obo/REX_0000397 oxygenase reaction http://purl.obolibrary.org/obo/REX_0000107 oxidoreductase reaction Any oxidoreductase reaction in which dioxygen is the electron acceptor. http://purl.obolibrary.org/obo/REX_0000398 dioxygenase reaction http://purl.obolibrary.org/obo/REX_0000397 oxygenase reaction Oxidoreductase reaction involving incorporation of both atoms of dioxygen into the donor. http://purl.obolibrary.org/obo/REX_0000399 monooxygenase reaction http://purl.obolibrary.org/obo/REX_0000397 oxygenase reaction Any oxidoreductase reaction that brings about the incorporation of only one atom of oxygen from dioxygen into the donor. http://purl.obolibrary.org/obo/REX_0000404 pyrolysis http://purl.obolibrary.org/obo/REX_0000086 thermolysis A chemical degradation reaction that is caused by thermal energy. The term pyrolysis generally refers to an inert environment. http://purl.obolibrary.org/obo/REX_0000405 redox reaction http://purl.obolibrary.org/obo/REX_0000002 chemical reaction A chemical reaction in which the oxidation of one reactant is coupled to the reduction of a second reactant. http://purl.obolibrary.org/obo/REX_0000406 ATP diphosphatase reaction http://purl.obolibrary.org/obo/REX_0000116 nucleoside-triphosphate diphosphatase reaction ATP + H2O --> AMP + diphosphate http://purl.obolibrary.org/obo/REX_0000407 ATPase reaction http://purl.obolibrary.org/obo/REX_0000115 nucleoside-triphosphatase reaction ATP + H2O --> ADP + phosphate http://purl.obolibrary.org/obo/REX_0000409 Na+/K+-exchanging ATPase reaction http://purl.obolibrary.org/obo/REX_0000408 ATPase-coupled transmembrane transport ATP + H2O + Na+(in) + K+(out) --> ADP + phosphate + Na+(out) + K+(in) http://purl.obolibrary.org/obo/REX_0000412 K+-transporting ATPase reaction http://purl.obolibrary.org/obo/REX_0000408 ATPase-coupled transmembrane transport ATP + H2O + K+(out) --> ADP + phosphate + K+(in) http://purl.obolibrary.org/obo/REX_0000413 solvolysis http://purl.obolibrary.org/obo/REX_0000002 chemical reaction Generally, reaction with a solvent, or with a lyonium ion or lyate ion, involving the rupture of one or more bonds in the reacting solute. More specifically the term is used for substitution, elimination and fragmentation reactions in which a solvent species is the nucleophile. http://purl.obolibrary.org/obo/REX_0000414 hydrolysis http://purl.obolibrary.org/obo/REX_0000413 solvolysis Solvolysis by water. http://purl.obolibrary.org/obo/REX_0000419 substitution reaction http://purl.obolibrary.org/obo/REX_0000002 chemical reaction A reaction, elementary or stepwise, in which one atom or group in a molecular entity is replaced by another atom or group. http://purl.obolibrary.org/obo/REX_0000420 electrophilic substitution reaction http://purl.obolibrary.org/obo/REX_0000424 heterolytic substitution reaction A heterolytic reaction in which the reagent supplying the entering group acts as an electrophile. http://purl.obolibrary.org/obo/REX_0000421 nucleophilic substitution reaction http://purl.obolibrary.org/obo/REX_0000424 heterolytic substitution reaction A heterolytic reaction in which the reagent supplying the entering group acts as a nucleophile. http://purl.obolibrary.org/obo/REX_0000422 polar reaction http://purl.obolibrary.org/obo/REX_0000002 chemical reaction A reaction proceeding by the movement of pairs of electrons from areas of high electron density (nucleophiles) to areas of low electron density (electrophiles), or from filled orbitals to empty orbitals. http://purl.obolibrary.org/obo/REX_0000427 addition reaction http://purl.obolibrary.org/obo/REX_0000002 chemical reaction A chemical reaction of two or more reacting molecular entities, resulting in a single reaction product containing all atoms of all components, with formation of two chemical bonds and a net reduction in bond multiplicity in at least one of the reactants. http://purl.obolibrary.org/obo/REX_0000435 oxidative addition http://purl.obolibrary.org/obo/REX_0000427 addition reaction The insertion of a metal of a metal complex into a covalent bond involving formally an overall two-electron loss on one metal or a one-electron loss on each of two metals. http://purl.obolibrary.org/obo/REX_0000446 oxygenation http://purl.obolibrary.org/obo/REX_0000445 oxidation The incorporation of molecular oxygen into a substrate. http://purl.obolibrary.org/obo/REX_0000448 dehydrogenation http://purl.obolibrary.org/obo/REX_0000445 oxidation Oxidation of an organic compound by the removal of one or more hydrogen atoms. http://purl.obolibrary.org/obo/REX_0000449 hydrogenation http://purl.obolibrary.org/obo/REX_0000444 reduction Reduction of an organic compound by the addition of the hydrogen atoms or dihydrogen. http://purl.obolibrary.org/obo/REX_0000453 osmosis http://purl.obolibrary.org/obo/REX_0000452 solvent transport The spontaneous net flow of solvent by diffusion through a semipermeable membrane from a phase where the solvent has a higher chemical potential to one where the solvent has a lower chemical potential. http://purl.obolibrary.org/obo/REX_0000454 electro-osmosis http://purl.obolibrary.org/obo/REX_0000453 osmosis The motion of a liquid through a membrane as a consequence of the application of an electric field across the membrane. http://purl.obolibrary.org/obo/REX_0000457 biological membrane transport http://purl.obolibrary.org/obo/REX_0000456 biological membrane process Any movement of substances or electrons across a biological membrane. http://purl.obolibrary.org/obo/REX_0000461 pseudo-catalysis http://purl.obolibrary.org/obo/REX_0000460 pseudo-catalytic reaction Increase the rate of the reaction by one of the reactant that is present in nearly constant concentration but is consumed during the process. http://purl.obolibrary.org/obo/REX_0000466 ethanol:NAD+ dehydrogenase reaction http://purl.obolibrary.org/obo/REX_0000482 aliphatic alcohol:NAD+ dehydrogenase ethanol + NAD+ --> acetaldehyde + NADH + H+ http://purl.obolibrary.org/obo/REX_0000467 ethanol dehydrogenation http://purl.obolibrary.org/obo/REX_0000486 primary alcohol dehydrogenation ethanol --> acetaldehyde + 2 e- + 2 H+ http://purl.obolibrary.org/obo/REX_0000468 NAD+ reduction http://purl.obolibrary.org/obo/REX_0000476 NAD(P)+ reduction NAD+ + 2 e- + H+ --> NADH http://purl.obolibrary.org/obo/REX_0000475 NADP+ reduction http://purl.obolibrary.org/obo/REX_0000476 NAD(P)+ reduction NADP+ + 2 e- + H+ --> NADPH http://purl.obolibrary.org/obo/REX_0000476 NAD(P)+ reduction http://purl.obolibrary.org/obo/REX_0000449 hydrogenation NAD(P)+ + 2 e- + H+ --> NAD(P)H http://purl.obolibrary.org/obo/REX_0000477 methanol:NAD+ dehydrogenase reaction http://purl.obolibrary.org/obo/REX_0000482 aliphatic alcohol:NAD+ dehydrogenase methanol + NAD+ --> formaldehyde + NADH + H+ http://purl.obolibrary.org/obo/REX_0000478 methanol dehydrogenation http://purl.obolibrary.org/obo/REX_0000486 primary alcohol dehydrogenation methanol --> formaldehyde + 2 e- + 2 H+ http://purl.obolibrary.org/obo/REX_0000479 aryl-alcohol:NADP+ dehydrogenase reaction http://purl.obolibrary.org/obo/REX_0000489 aryl-alcohol:NAD(P)+ dehydrogenase reaction an aromatic alcohol + NADP+ --> an aromatic aldehyde + NADPH + H+ http://purl.obolibrary.org/obo/REX_0000480 propan-2-ol:NADP+ dehydrogenase reaction http://purl.obolibrary.org/obo/REX_0000471 alcohol:NADP+ dehydrogenase reaction propan-2-ol + NADP+ --> acetone + NADPH + H+ http://purl.obolibrary.org/obo/REX_0000481 aryl-alcohol:NAD+ dehydrogenase reaction http://purl.obolibrary.org/obo/REX_0000489 aryl-alcohol:NAD(P)+ dehydrogenase reaction an aromatic alcohol + NAD+ --> an aromatic aldehyde + NADH + H+ http://purl.obolibrary.org/obo/REX_0000482 aliphatic alcohol:NAD+ dehydrogenase http://purl.obolibrary.org/obo/REX_0000470 alcohol:NAD+ dehydrogenase reaction an alcohol + NAD+ --> an aldehyde or ketone + NADH + H+ http://purl.obolibrary.org/obo/REX_0000483 3-hydroxybenzyl-alcohol:NADP+ dehydrogenase reaction http://purl.obolibrary.org/obo/REX_0000479 aryl-alcohol:NADP+ dehydrogenase reaction 3-hydroxybenzyl alcohol + NADP+ --> 3-hydroxybenzaldehyde + NADPH + H+ http://purl.obolibrary.org/obo/REX_0000484 3-hydroxybenzyl alcohol dehydrogenation http://purl.obolibrary.org/obo/REX_0000486 primary alcohol dehydrogenation 3-hydroxybenzyl alcohol --> 3-hydroxybenzaldehyde + 2 e- + 2 H+ http://purl.obolibrary.org/obo/REX_0000486 primary alcohol dehydrogenation http://purl.obolibrary.org/obo/REX_0000485 alcohol dehydrogenation R-CH2OH --> R-C(O)H + 2 e- + 2 H+ http://purl.obolibrary.org/obo/REX_0000487 secondary alcohol dehydrogenation http://purl.obolibrary.org/obo/REX_0000485 alcohol dehydrogenation R-CH(OH)-R' --> R-C(O)-R' + 2 e- + 2 H+ http://purl.obolibrary.org/obo/REX_0000488 propan-2-ol dehydrogenation http://purl.obolibrary.org/obo/REX_0000487 secondary alcohol dehydrogenation propan-2-ol --> acetone + 2 e- + 2 H+ http://purl.obolibrary.org/obo/REX_0000490 chelation http://purl.obolibrary.org/obo/REX_0000142 coordination The formation or presence of bonds between two or more separate binding sites within the same ligand and a single central atom. http://purl.obolibrary.org/obo/REX_0000506 NAD(P)H oxidase reaction http://purl.obolibrary.org/obo/REX_0000505 NAD(P)H:oxygen dehydrogenase reaction NAD(P)H + H+ + O2 --> NAD(P)+ + H2O2 http://purl.obolibrary.org/obo/REX_0000514 ferroxidase reaction http://purl.obolibrary.org/obo/REX_0000513 metal:oxygen oxidoreductase reaction 4 Fe(2+) + 4 H+ + O2 --> 4 Fe(3+) + 2 H2O http://purl.obolibrary.org/obo/REX_0000516 cob(II)yrinic acid a,c-diamide reductase reaction http://purl.obolibrary.org/obo/REX_0000515 metal:flavin oxidoreductase reaction 2 cob(II)yrinic acid a,c-diamide + FMN --> 2 cob(I)yrinic acid a,c-diamide + FMNH2 http://purl.obolibrary.org/obo/REX_0000518 NADPH:mercury oxidoreductase reaction http://purl.obolibrary.org/obo/REX_0000532 NADPH:metal oxidoreductase reaction Hg2+ + NADPH --> Hg + NADP+ + H+ http://purl.obolibrary.org/obo/REX_0000520 NADPH:cyanocobalamin oxidoreductase reaction http://purl.obolibrary.org/obo/REX_0000532 NADPH:metal oxidoreductase reaction cyanocob(III)alamin + NADPH + H+ --> cob(I)alamin + cyanide + NADP+ http://purl.obolibrary.org/obo/REX_0000521 NADH:diferric-transferrin oxidoreductase reaction http://purl.obolibrary.org/obo/REX_0000533 NADH:metal oxidoreductase reaction transferrin[Fe(III)]2 + NADH + H+ --> transferrin[Fe(II)]2 + NAD+ http://purl.obolibrary.org/obo/REX_0000522 NADH:aquacobalamin oxidoreductase reaction http://purl.obolibrary.org/obo/REX_0000533 NADH:metal oxidoreductase reaction 2 aquacob(III)alamin + NADH + H+ --> 2 cob(II)alamin + NAD+ http://purl.obolibrary.org/obo/REX_0000523 NADH:cob(II)alamin oxidoreductase reaction http://purl.obolibrary.org/obo/REX_0000533 NADH:metal oxidoreductase reaction cob(II)alamin + NADH + H+ --> 2 cob(I)alamin + NAD+ http://purl.obolibrary.org/obo/REX_0000524 NADPH:aquacobalamin oxidoreductase reaction http://purl.obolibrary.org/obo/REX_0000532 NADPH:metal oxidoreductase reaction 2 aquacob(III)alamin + NADPH + H+ --> 2 cob(II)alamin + NADP+ http://purl.obolibrary.org/obo/REX_0000525 NADH:ferric-chelate oxidoreductase reaction http://purl.obolibrary.org/obo/REX_0000533 NADH:metal oxidoreductase reaction 2 Fe(III) + NADH + H+ --> 2 Fe(II) + NAD+ http://purl.obolibrary.org/obo/REX_0000526 NADPH:[methionine synthase] oxidoreductase reaction http://purl.obolibrary.org/obo/REX_0000532 NADPH:metal oxidoreductase reaction 2 [methionine synthase]-cob(II)alamin + NADPH + H+ + 2 S-adenosyl-L-methionine --> 2 [methionine synthase]-methylcob(I)alamin + 2 S-adenosylhomocysteine + NADP+ http://purl.obolibrary.org/obo/REX_0000530 ferrocytochrome:nitrate reductase reaction http://purl.obolibrary.org/obo/REX_0000529 hemoprotein:nitrate oxidoreductase reaction ferrocytochrome + nitrate --> ferricytochrome + nitrite http://purl.obolibrary.org/obo/REX_0000531 cytochrome-c oxidase reaction http://purl.obolibrary.org/obo/REX_0000528 hemoprotein:oxygen oxidoreductase reaction 4 ferrocytochrome c + O2 --> 4 ferricytochrome c + 2 H2O http://purl.obolibrary.org/obo/REX_0000535 hydrogen:NAD(P)+ oxidoreductase reaction http://purl.obolibrary.org/obo/REX_0000534 hydrogenase reaction H2 + NAD(P)+ --> H+ + NAD(P)H http://purl.obolibrary.org/obo/REX_0000536 hydrogen:NAD+ oxidoreductase reaction http://purl.obolibrary.org/obo/REX_0000535 hydrogen:NAD(P)+ oxidoreductase reaction H2 + NAD+ --> H+ + NADH http://purl.obolibrary.org/obo/REX_0000537 hydrogen:NADP+ oxidoreductase reaction http://purl.obolibrary.org/obo/REX_0000535 hydrogen:NAD(P)+ oxidoreductase reaction H2 + NADP+ --> H+ + NADPH http://purl.obolibrary.org/obo/REX_0000539 hydrogen:ferricytochrome-c3 oxidoreductase reaction http://purl.obolibrary.org/obo/REX_0000538 hydrogen:cytochrome oxidoreductase reaction 2 H2 + ferricytochrome c3 --> 4 H+ + ferrocytochrome c3 http://purl.obolibrary.org/obo/REX_0000541 magnesium-protoporphyrin IX monomethyl ester (oxidative) cyclase reaction http://purl.obolibrary.org/obo/REX_0000402 paired donor monooxygenase reaction magnesium-protoporphyrin IX 13-monomethyl ester + 3 NADPH + 3 H+ + 3 O2 --> divinylprotochlorophyllide + 3 NADP+ + 5 H2O http://purl.obolibrary.org/obo/REX_0000542 hydrogen:ferredoxin oxidoreductase reaction http://purl.obolibrary.org/obo/REX_0000534 hydrogenase reaction H2 + oxidized ferredoxin --> reduced ferredoxin + 2 H+ http://purl.obolibrary.org/obo/REX_0000546 tunnelling http://purl.obolibrary.org/obo/REX_0000166 microscopic process The process by which a particle or a set of particles crosses a barrier on its potential-energy surface without having the energy required to surmount this barrier. http://purl.obolibrary.org/obo/REX_0000549 concerted proton tunnelling-electron tunnelling http://purl.obolibrary.org/obo/REX_0000546 tunnelling A concerted process where the proton and the electron tunnel at the same time but independently of each other. http://purl.obolibrary.org/obo/REX_0000550 primary photoreaction http://purl.obolibrary.org/obo/REX_0000055 elementary reaction Elementary chemical process undergone by an electronically excited molecular entity and yielding a primary photoproduct. http://purl.obolibrary.org/obo/REX_0000551 predissociation http://purl.obolibrary.org/obo/REX_0000151 dissociation Dissociation occurring by tunnelling from a 'bound' to an 'unbound' vibronic state. http://purl.obolibrary.org/obo/REX_0000166 microscopic process http://purl.obolibrary.org/obo/REX_0000001 process http://purl.obolibrary.org/obo/REX_0000167 macroscopic process http://purl.obolibrary.org/obo/REX_0000001 process http://purl.obolibrary.org/obo/REX_0000084 noncatalytic reaction http://purl.obolibrary.org/obo/REX_0000002 chemical reaction http://purl.obolibrary.org/obo/REX_0000103 biochemical reaction http://purl.obolibrary.org/obo/REX_0000002 chemical reaction http://purl.obolibrary.org/obo/REX_0000213 electrochemical reaction http://purl.obolibrary.org/obo/REX_0000002 chemical reaction http://purl.obolibrary.org/obo/REX_0000235 modification of reaction http://purl.obolibrary.org/obo/REX_0000002 chemical reaction http://purl.obolibrary.org/obo/REX_0000433 pericyclic reaction http://purl.obolibrary.org/obo/REX_0000002 chemical reaction http://purl.obolibrary.org/obo/REX_0000022 electron emission http://purl.obolibrary.org/obo/REX_0000007 beta-decay http://purl.obolibrary.org/obo/REX_0000023 positron emission http://purl.obolibrary.org/obo/REX_0000007 beta-decay http://purl.obolibrary.org/obo/REX_0000018 gamma-decay http://purl.obolibrary.org/obo/REX_0000012 radioactive decay http://purl.obolibrary.org/obo/REX_0000326 particle-antiparticle pair production http://purl.obolibrary.org/obo/REX_0000014 subatomic process http://purl.obolibrary.org/obo/REX_0000024 induced fission http://purl.obolibrary.org/obo/REX_0000025 nuclear reaction http://purl.obolibrary.org/obo/REX_0000019 gamma emission http://purl.obolibrary.org/obo/REX_0000018 gamma-decay http://purl.obolibrary.org/obo/REX_0000020 internal conversion http://purl.obolibrary.org/obo/REX_0000018 gamma-decay http://purl.obolibrary.org/obo/REX_0000021 internal pair production http://purl.obolibrary.org/obo/REX_0000288 electron-positron pair production http://purl.obolibrary.org/obo/REX_0000106 biological electron transfer http://purl.obolibrary.org/obo/REX_0000103 biochemical reaction http://purl.obolibrary.org/obo/REX_0000137 photobiochemical reaction http://purl.obolibrary.org/obo/REX_0000103 biochemical reaction http://purl.obolibrary.org/obo/REX_0000293 delayed fluorescence http://purl.obolibrary.org/obo/REX_0000292 delayed luminescence http://purl.obolibrary.org/obo/REX_0000450 photohydrogenation http://purl.obolibrary.org/obo/REX_0000045 photoreduction http://purl.obolibrary.org/obo/REX_0000451 photoelectronation http://purl.obolibrary.org/obo/REX_0000045 photoreduction http://purl.obolibrary.org/obo/REX_0000051 catalytic reaction http://purl.obolibrary.org/obo/REX_0000056 stepwise reaction http://purl.obolibrary.org/obo/REX_0000460 pseudo-catalytic reaction http://purl.obolibrary.org/obo/REX_0000056 stepwise reaction http://purl.obolibrary.org/obo/REX_0000059 chain reaction step http://purl.obolibrary.org/obo/REX_0000058 reaction step http://purl.obolibrary.org/obo/REX_0000075 nucleic acid-catalysed reaction http://purl.obolibrary.org/obo/REX_0000071 biomacromolecule-catalysed reaction http://purl.obolibrary.org/obo/REX_0000077 protein-catalysed reaction http://purl.obolibrary.org/obo/REX_0000071 biomacromolecule-catalysed reaction http://purl.obolibrary.org/obo/REX_0000074 deoxyribozymatic reaction http://purl.obolibrary.org/obo/REX_0000075 nucleic acid-catalysed reaction http://purl.obolibrary.org/obo/REX_0000076 ribozymatic reaction http://purl.obolibrary.org/obo/REX_0000075 nucleic acid-catalysed reaction http://purl.obolibrary.org/obo/REX_0000072 enzymatic reaction http://purl.obolibrary.org/obo/REX_0000077 protein-catalysed reaction http://purl.obolibrary.org/obo/REX_0000073 abzymatic reaction http://purl.obolibrary.org/obo/REX_0000077 protein-catalysed reaction http://purl.obolibrary.org/obo/REX_0000071 biomacromolecule-catalysed reaction http://purl.obolibrary.org/obo/REX_0000103 biochemical reaction http://purl.obolibrary.org/obo/REX_0000089 addition http://purl.obolibrary.org/obo/REX_0000087 transformation http://purl.obolibrary.org/obo/REX_0000094 rearrangement http://purl.obolibrary.org/obo/REX_0000098 isomerization http://purl.obolibrary.org/obo/REX_0000104 biotransformation reaction http://purl.obolibrary.org/obo/REX_0000103 biochemical reaction http://purl.obolibrary.org/obo/REX_0000238 modification of enzyme catalysis http://purl.obolibrary.org/obo/REX_0000236 modification of catalysis http://purl.obolibrary.org/obo/REX_0000108 transferase reaction http://purl.obolibrary.org/obo/REX_0000104 biotransformation reaction http://purl.obolibrary.org/obo/REX_0000110 lyase reaction http://purl.obolibrary.org/obo/REX_0000104 biotransformation reaction http://purl.obolibrary.org/obo/REX_0000111 isomerase reaction http://purl.obolibrary.org/obo/REX_0000104 biotransformation reaction http://purl.obolibrary.org/obo/REX_0000130 transmembrane electron transfer http://purl.obolibrary.org/obo/REX_0000457 biological membrane transport http://purl.obolibrary.org/obo/REX_0000138 intermembrane electron transfer http://purl.obolibrary.org/obo/REX_0000456 biological membrane process http://purl.obolibrary.org/obo/REX_0000139 one-electron transfer http://purl.obolibrary.org/obo/REX_0000106 biological electron transfer http://purl.obolibrary.org/obo/REX_0000140 two-electron transfer http://purl.obolibrary.org/obo/REX_0000106 biological electron transfer http://purl.obolibrary.org/obo/REX_0000128 oxidoreduction-driven transport http://purl.obolibrary.org/obo/REX_0000123 primary active transport http://purl.obolibrary.org/obo/REX_0000447 dehydrogenase reaction http://purl.obolibrary.org/obo/REX_0000107 oxidoreductase reaction http://purl.obolibrary.org/obo/REX_0000472 donor:NAD(P)+ oxidoreductase reaction http://purl.obolibrary.org/obo/REX_0000107 oxidoreductase reaction http://purl.obolibrary.org/obo/REX_0000500 donor:iron protein oxidoreductase reaction http://purl.obolibrary.org/obo/REX_0000107 oxidoreductase reaction http://purl.obolibrary.org/obo/REX_0000509 donor:oxygen oxidoreductase reaction http://purl.obolibrary.org/obo/REX_0000107 oxidoreductase reaction http://purl.obolibrary.org/obo/REX_0000510 donor:quinone oxidoreductase reaction http://purl.obolibrary.org/obo/REX_0000107 oxidoreductase reaction http://purl.obolibrary.org/obo/REX_0000511 metal oxidoreductase reaction http://purl.obolibrary.org/obo/REX_0000107 oxidoreductase reaction http://purl.obolibrary.org/obo/REX_0000517 donor:flavin oxidoreductase reaction http://purl.obolibrary.org/obo/REX_0000107 oxidoreductase reaction http://purl.obolibrary.org/obo/REX_0000534 hydrogenase reaction http://purl.obolibrary.org/obo/REX_0000107 oxidoreductase reaction http://purl.obolibrary.org/obo/REX_0000109 hydrolase reaction http://purl.obolibrary.org/obo/REX_0000108 transferase reaction http://purl.obolibrary.org/obo/REX_0000339 chelatase reaction http://purl.obolibrary.org/obo/REX_0000108 transferase reaction http://purl.obolibrary.org/obo/REX_0000464 alkylmercury lyase reaction http://purl.obolibrary.org/obo/REX_0000108 transferase reaction http://purl.obolibrary.org/obo/REX_0000113 acid anhydride hydrolase reaction http://purl.obolibrary.org/obo/REX_0000109 hydrolase reaction http://purl.obolibrary.org/obo/REX_0000344 ATP-hydrolysing chelatase reaction http://purl.obolibrary.org/obo/REX_0000339 chelatase reaction http://purl.obolibrary.org/obo/REX_0000114 phosphorus-containing anhydride hydrolase reaction http://purl.obolibrary.org/obo/REX_0000113 acid anhydride hydrolase reaction http://purl.obolibrary.org/obo/REX_0000117 nucleoside triphosphate (di)phosphohydrolase reaction http://purl.obolibrary.org/obo/REX_0000114 phosphorus-containing anhydride hydrolase reaction http://purl.obolibrary.org/obo/REX_0000112 ligase reaction http://purl.obolibrary.org/obo/REX_0000117 nucleoside triphosphate (di)phosphohydrolase reaction http://purl.obolibrary.org/obo/REX_0000135 solute transport http://purl.obolibrary.org/obo/REX_0000119 transmembrane transport http://purl.obolibrary.org/obo/REX_0000452 solvent transport http://purl.obolibrary.org/obo/REX_0000119 transmembrane transport http://purl.obolibrary.org/obo/REX_0000123 primary active transport http://purl.obolibrary.org/obo/REX_0000120 active transport http://purl.obolibrary.org/obo/REX_0000124 secondary active transport http://purl.obolibrary.org/obo/REX_0000120 active transport http://purl.obolibrary.org/obo/REX_0000125 diphosphate-bond-hydrolysis-driven transport http://purl.obolibrary.org/obo/REX_0000123 primary active transport http://purl.obolibrary.org/obo/REX_0000126 decarboxylation-driven transport http://purl.obolibrary.org/obo/REX_0000123 primary active transport http://purl.obolibrary.org/obo/REX_0000127 methyl-transfer-driven transport http://purl.obolibrary.org/obo/REX_0000123 primary active transport http://purl.obolibrary.org/obo/REX_0000129 light-driven transport http://purl.obolibrary.org/obo/REX_0000137 photobiochemical reaction http://purl.obolibrary.org/obo/REX_0000408 ATPase-coupled transmembrane transport http://purl.obolibrary.org/obo/REX_0000125 diphosphate-bond-hydrolysis-driven transport http://purl.obolibrary.org/obo/REX_0000131 two-electron transmembrane electron transfer http://purl.obolibrary.org/obo/REX_0000140 two-electron transfer http://purl.obolibrary.org/obo/REX_0000132 one-electron transmembrane electron transfer http://purl.obolibrary.org/obo/REX_0000139 one-electron transfer http://purl.obolibrary.org/obo/REX_0000146 homolysis http://purl.obolibrary.org/obo/REX_0000149 detachment http://purl.obolibrary.org/obo/REX_0000147 heterolysis http://purl.obolibrary.org/obo/REX_0000149 detachment http://purl.obolibrary.org/obo/REX_0000014 subatomic process http://purl.obolibrary.org/obo/REX_0000166 microscopic process http://purl.obolibrary.org/obo/REX_0000155 electronic transition http://purl.obolibrary.org/obo/REX_0000166 microscopic process http://purl.obolibrary.org/obo/REX_0000206 surface process http://purl.obolibrary.org/obo/REX_0000167 macroscopic process http://purl.obolibrary.org/obo/REX_0000371 exothermic process http://purl.obolibrary.org/obo/REX_0000167 macroscopic process http://purl.obolibrary.org/obo/REX_0000372 endothermic process http://purl.obolibrary.org/obo/REX_0000167 macroscopic process http://purl.obolibrary.org/obo/REX_0000458 transport http://purl.obolibrary.org/obo/REX_0000167 macroscopic process http://purl.obolibrary.org/obo/REX_0000426 unimolecular nucleophilic substitution http://purl.obolibrary.org/obo/REX_0000421 nucleophilic substitution reaction http://purl.obolibrary.org/obo/REX_0000437 unimolecular electrophilic substitution http://purl.obolibrary.org/obo/REX_0000420 electrophilic substitution reaction http://purl.obolibrary.org/obo/REX_0000425 bimolecular nucleophilic substitution http://purl.obolibrary.org/obo/REX_0000421 nucleophilic substitution reaction http://purl.obolibrary.org/obo/REX_0000438 bimolecular electrophilic substitution http://purl.obolibrary.org/obo/REX_0000420 electrophilic substitution reaction http://purl.obolibrary.org/obo/REX_0000215 electro-crystallization http://purl.obolibrary.org/obo/REX_0000214 electrodeposition http://purl.obolibrary.org/obo/REX_0000202 associative desorption http://purl.obolibrary.org/obo/REX_0000199 desorption http://purl.obolibrary.org/obo/REX_0000455 membrane process http://purl.obolibrary.org/obo/REX_0000206 surface process http://purl.obolibrary.org/obo/REX_0000205 associative adsorption http://purl.obolibrary.org/obo/REX_0000208 chemisorption http://purl.obolibrary.org/obo/REX_0000224 inhibition of catalysis http://purl.obolibrary.org/obo/REX_0000236 modification of catalysis http://purl.obolibrary.org/obo/REX_0000237 competitive enzyme inhibition http://purl.obolibrary.org/obo/REX_0000226 linear enzyme inhibition http://purl.obolibrary.org/obo/REX_0000233 enzyme inhibition http://purl.obolibrary.org/obo/REX_0000238 modification of enzyme catalysis http://purl.obolibrary.org/obo/REX_0000247 reversible inhibition of catalysis http://purl.obolibrary.org/obo/REX_0000224 inhibition of catalysis http://purl.obolibrary.org/obo/REX_0000248 irreversible inhibition of catalysis http://purl.obolibrary.org/obo/REX_0000224 inhibition of catalysis http://purl.obolibrary.org/obo/REX_0000226 linear enzyme inhibition http://purl.obolibrary.org/obo/REX_0000225 reversible enzyme inhibition http://purl.obolibrary.org/obo/REX_0000245 hyperbolic inhibition http://purl.obolibrary.org/obo/REX_0000225 reversible enzyme inhibition http://purl.obolibrary.org/obo/REX_0000227 mixed inhibition http://purl.obolibrary.org/obo/REX_0000226 linear enzyme inhibition http://purl.obolibrary.org/obo/REX_0000229 uncompetitive inhibition http://purl.obolibrary.org/obo/REX_0000226 linear enzyme inhibition http://purl.obolibrary.org/obo/REX_0000228 non-competitive inhibition http://purl.obolibrary.org/obo/REX_0000227 mixed inhibition http://purl.obolibrary.org/obo/REX_0000246 non-competitive inhibition by protons http://purl.obolibrary.org/obo/REX_0000228 non-competitive inhibition http://purl.obolibrary.org/obo/REX_0000232 hyperbolic activation http://purl.obolibrary.org/obo/REX_0000230 reversible enzyme activation http://purl.obolibrary.org/obo/REX_0000225 reversible enzyme inhibition http://purl.obolibrary.org/obo/REX_0000247 reversible inhibition of catalysis http://purl.obolibrary.org/obo/REX_0000234 irreversible enzyme inhibition http://purl.obolibrary.org/obo/REX_0000248 irreversible inhibition of catalysis http://purl.obolibrary.org/obo/REX_0000221 activation http://purl.obolibrary.org/obo/REX_0000235 modification of reaction http://purl.obolibrary.org/obo/REX_0000236 modification of catalysis http://purl.obolibrary.org/obo/REX_0000235 modification of reaction http://purl.obolibrary.org/obo/REX_0000243 irreversible modification of enzyme catalysis http://purl.obolibrary.org/obo/REX_0000238 modification of enzyme catalysis http://purl.obolibrary.org/obo/REX_0000244 reversible modification of enzyme catalysis http://purl.obolibrary.org/obo/REX_0000238 modification of enzyme catalysis http://purl.obolibrary.org/obo/REX_0000230 reversible enzyme activation http://purl.obolibrary.org/obo/REX_0000244 reversible modification of enzyme catalysis http://purl.obolibrary.org/obo/REX_0000240 irreversible enzyme activation http://purl.obolibrary.org/obo/REX_0000243 irreversible modification of enzyme catalysis http://purl.obolibrary.org/obo/REX_0000242 enzyme activation by phosphate group transfer http://purl.obolibrary.org/obo/REX_0000240 irreversible enzyme activation http://purl.obolibrary.org/obo/REX_0000389 luciferin monooxygenase reaction http://purl.obolibrary.org/obo/REX_0000298 bioluminescence http://purl.obolibrary.org/obo/REX_0000396 alkanal monooxygenase (FMN-linked) reaction http://purl.obolibrary.org/obo/REX_0000402 paired donor monooxygenase reaction http://purl.obolibrary.org/obo/REX_0000324 singlet-singlet annihilation http://purl.obolibrary.org/obo/REX_0000323 excitation annihilation http://purl.obolibrary.org/obo/REX_0000334 proton-antiproton pair production http://purl.obolibrary.org/obo/REX_0000326 particle-antiparticle pair production http://purl.obolibrary.org/obo/REX_0000335 neutron-antineutron pair production http://purl.obolibrary.org/obo/REX_0000326 particle-antiparticle pair production http://purl.obolibrary.org/obo/REX_0000340 ferrochelatase reaction http://purl.obolibrary.org/obo/REX_0000339 chelatase reaction http://purl.obolibrary.org/obo/REX_0000341 sirohydrochlorin cobaltochelatase reaction http://purl.obolibrary.org/obo/REX_0000339 chelatase reaction http://purl.obolibrary.org/obo/REX_0000342 magnesium chelatase reaction http://purl.obolibrary.org/obo/REX_0000344 ATP-hydrolysing chelatase reaction http://purl.obolibrary.org/obo/REX_0000343 cobaltochelatase reaction http://purl.obolibrary.org/obo/REX_0000344 ATP-hydrolysing chelatase reaction http://purl.obolibrary.org/obo/REX_0000354 neutron scattering http://purl.obolibrary.org/obo/REX_0000348 scattering http://purl.obolibrary.org/obo/REX_0000355 electron scattering http://purl.obolibrary.org/obo/REX_0000348 scattering http://purl.obolibrary.org/obo/REX_0000361 X-ray scattering http://purl.obolibrary.org/obo/REX_0000348 scattering http://purl.obolibrary.org/obo/REX_0000364 elastic scattering http://purl.obolibrary.org/obo/REX_0000348 scattering http://purl.obolibrary.org/obo/REX_0000365 inelastic scattering http://purl.obolibrary.org/obo/REX_0000348 scattering http://purl.obolibrary.org/obo/REX_0000358 inelastic light scattering http://purl.obolibrary.org/obo/REX_0000365 inelastic scattering http://purl.obolibrary.org/obo/REX_0000359 elastic neutron scattering http://purl.obolibrary.org/obo/REX_0000364 elastic scattering http://purl.obolibrary.org/obo/REX_0000360 inelastic neutron scattering http://purl.obolibrary.org/obo/REX_0000365 inelastic scattering http://purl.obolibrary.org/obo/REX_0000356 elastic electron scattering http://purl.obolibrary.org/obo/REX_0000364 elastic scattering http://purl.obolibrary.org/obo/REX_0000357 inelastic electron scattering http://purl.obolibrary.org/obo/REX_0000365 inelastic scattering http://purl.obolibrary.org/obo/REX_0000366 Raman light scattering http://purl.obolibrary.org/obo/REX_0000358 inelastic light scattering http://purl.obolibrary.org/obo/REX_0000367 Brillouin light scattering http://purl.obolibrary.org/obo/REX_0000358 inelastic light scattering http://purl.obolibrary.org/obo/REX_0000362 elastic X-ray scattering http://purl.obolibrary.org/obo/REX_0000364 elastic scattering http://purl.obolibrary.org/obo/REX_0000363 inelastic X-ray scattering http://purl.obolibrary.org/obo/REX_0000365 inelastic scattering http://purl.obolibrary.org/obo/REX_0000390 Renilla-luciferin 2-monooxygenase reaction http://purl.obolibrary.org/obo/REX_0000401 single donor monooxygenase reaction http://purl.obolibrary.org/obo/REX_0000391 Cypridina-luciferin 2-monooxygenase reaction http://purl.obolibrary.org/obo/REX_0000401 single donor monooxygenase reaction http://purl.obolibrary.org/obo/REX_0000392 Photinus-luciferin 4-monooxygenase (ATP-hydrolysing) reaction http://purl.obolibrary.org/obo/REX_0000401 single donor monooxygenase reaction http://purl.obolibrary.org/obo/REX_0000393 Watasenia-luciferin 2-monooxygenase reaction http://purl.obolibrary.org/obo/REX_0000401 single donor monooxygenase reaction http://purl.obolibrary.org/obo/REX_0000394 Oplophorus-luciferin 2-monooxygenase reaction http://purl.obolibrary.org/obo/REX_0000401 single donor monooxygenase reaction http://purl.obolibrary.org/obo/REX_0000395 Latia-luciferin monooxygenase (demethylating) reaction http://purl.obolibrary.org/obo/REX_0000402 paired donor monooxygenase reaction http://purl.obolibrary.org/obo/REX_0000400 single donor dioxygenase reaction http://purl.obolibrary.org/obo/REX_0000398 dioxygenase reaction http://purl.obolibrary.org/obo/REX_0000403 paired donor dioxygenase reaction http://purl.obolibrary.org/obo/REX_0000398 dioxygenase reaction http://purl.obolibrary.org/obo/REX_0000401 single donor monooxygenase reaction http://purl.obolibrary.org/obo/REX_0000399 monooxygenase reaction http://purl.obolibrary.org/obo/REX_0000402 paired donor monooxygenase reaction http://purl.obolibrary.org/obo/REX_0000399 monooxygenase reaction http://purl.obolibrary.org/obo/REX_0000415 solvolytic elimination http://purl.obolibrary.org/obo/REX_0000413 solvolysis http://purl.obolibrary.org/obo/REX_0000416 solvolytic substitution http://purl.obolibrary.org/obo/REX_0000419 substitution reaction http://purl.obolibrary.org/obo/REX_0000418 nucleophilic solvolysis http://purl.obolibrary.org/obo/REX_0000422 polar reaction http://purl.obolibrary.org/obo/REX_0000417 nucleophilic solvolytic substitution http://purl.obolibrary.org/obo/REX_0000421 nucleophilic substitution reaction http://purl.obolibrary.org/obo/REX_0000423 homolytic substitution reaction http://purl.obolibrary.org/obo/REX_0000419 substitution reaction http://purl.obolibrary.org/obo/REX_0000424 heterolytic substitution reaction http://purl.obolibrary.org/obo/REX_0000422 polar reaction http://purl.obolibrary.org/obo/REX_0000428 heterolytic addition reaction http://purl.obolibrary.org/obo/REX_0000427 addition reaction http://purl.obolibrary.org/obo/REX_0000429 homolytic addition reaction http://purl.obolibrary.org/obo/REX_0000427 addition reaction http://purl.obolibrary.org/obo/REX_0000432 pericyclic addition reaction http://purl.obolibrary.org/obo/REX_0000427 addition reaction http://purl.obolibrary.org/obo/REX_0000430 electrophilic addition http://purl.obolibrary.org/obo/REX_0000428 heterolytic addition reaction http://purl.obolibrary.org/obo/REX_0000431 nucleophilic addition http://purl.obolibrary.org/obo/REX_0000428 heterolytic addition reaction http://purl.obolibrary.org/obo/REX_0000439 electrocyclic reaction http://purl.obolibrary.org/obo/REX_0000433 pericyclic reaction http://purl.obolibrary.org/obo/REX_0000440 sigmatropic rearrangement http://purl.obolibrary.org/obo/REX_0000433 pericyclic reaction http://purl.obolibrary.org/obo/REX_0000441 ene reaction http://purl.obolibrary.org/obo/REX_0000433 pericyclic reaction http://purl.obolibrary.org/obo/REX_0000442 electrocyclic ring closing http://purl.obolibrary.org/obo/REX_0000439 electrocyclic reaction http://purl.obolibrary.org/obo/REX_0000465 alcohol:acceptor dehydrogenase reaction http://purl.obolibrary.org/obo/REX_0000447 dehydrogenase reaction http://purl.obolibrary.org/obo/REX_0000495 carbonyl:acceptor dehydrogenase reaction http://purl.obolibrary.org/obo/REX_0000447 dehydrogenase reaction http://purl.obolibrary.org/obo/REX_0000502 NAD(P)H:acceptor dehydrogenase reaction http://purl.obolibrary.org/obo/REX_0000447 dehydrogenase reaction http://purl.obolibrary.org/obo/REX_0000119 transmembrane transport http://purl.obolibrary.org/obo/REX_0000458 transport http://purl.obolibrary.org/obo/REX_0000456 biological membrane process http://purl.obolibrary.org/obo/REX_0000455 membrane process http://purl.obolibrary.org/obo/REX_0000459 biological membrane fusion http://purl.obolibrary.org/obo/REX_0000456 biological membrane process http://purl.obolibrary.org/obo/REX_0000105 biological transport http://purl.obolibrary.org/obo/REX_0000458 transport http://purl.obolibrary.org/obo/REX_0000462 general acid pseudo-catalysis http://purl.obolibrary.org/obo/REX_0000461 pseudo-catalysis http://purl.obolibrary.org/obo/REX_0000463 general base pseudo-catalysis http://purl.obolibrary.org/obo/REX_0000461 pseudo-catalysis http://purl.obolibrary.org/obo/REX_0000469 alcohol:NAD(P)+ dehydrogenase reaction http://purl.obolibrary.org/obo/REX_0000472 donor:NAD(P)+ oxidoreductase reaction http://purl.obolibrary.org/obo/REX_0000492 alcohol:cytochrome dehydrogenase reaction http://purl.obolibrary.org/obo/REX_0000508 donor:cytochrome oxidoreductase reaction http://purl.obolibrary.org/obo/REX_0000493 alcohol:oxygen dehydrogenase reaction http://purl.obolibrary.org/obo/REX_0000509 donor:oxygen oxidoreductase reaction http://purl.obolibrary.org/obo/REX_0000494 alcohol:quinone dehydrogenase reaction http://purl.obolibrary.org/obo/REX_0000510 donor:quinone oxidoreductase reaction http://purl.obolibrary.org/obo/REX_0000470 alcohol:NAD+ dehydrogenase reaction http://purl.obolibrary.org/obo/REX_0000473 donor:NAD+ dehydrogenase reaction http://purl.obolibrary.org/obo/REX_0000471 alcohol:NADP+ dehydrogenase reaction http://purl.obolibrary.org/obo/REX_0000474 donor:NADP+ dehydrogenase reaction http://purl.obolibrary.org/obo/REX_0000489 aryl-alcohol:NAD(P)+ dehydrogenase reaction http://purl.obolibrary.org/obo/REX_0000469 alcohol:NAD(P)+ dehydrogenase reaction http://purl.obolibrary.org/obo/REX_0000473 donor:NAD+ dehydrogenase reaction http://purl.obolibrary.org/obo/REX_0000472 donor:NAD(P)+ oxidoreductase reaction http://purl.obolibrary.org/obo/REX_0000474 donor:NADP+ dehydrogenase reaction http://purl.obolibrary.org/obo/REX_0000472 donor:NAD(P)+ oxidoreductase reaction http://purl.obolibrary.org/obo/REX_0000496 carbonyl:NAD(P)+ dehydrogenase reaction http://purl.obolibrary.org/obo/REX_0000495 carbonyl:acceptor dehydrogenase reaction http://purl.obolibrary.org/obo/REX_0000512 metal:NAD(P)+ oxidoreductase reaction http://purl.obolibrary.org/obo/REX_0000511 metal oxidoreductase reaction http://purl.obolibrary.org/obo/REX_0000508 donor:cytochrome oxidoreductase reaction http://purl.obolibrary.org/obo/REX_0000491 donor:hemoprotein oxidoreductase reaction http://purl.obolibrary.org/obo/REX_0000497 carbonyl:cytochrome dehydrogenase reaction http://purl.obolibrary.org/obo/REX_0000508 donor:cytochrome oxidoreductase reaction http://purl.obolibrary.org/obo/REX_0000498 carbonyl:oxygen dehydrogenase reaction http://purl.obolibrary.org/obo/REX_0000509 donor:oxygen oxidoreductase reaction http://purl.obolibrary.org/obo/REX_0000499 carbonyl:ferredoxin dehydrogenase reaction http://purl.obolibrary.org/obo/REX_0000501 donor:iron-sulfur protein oxidoreductase reaction http://purl.obolibrary.org/obo/REX_0000491 donor:hemoprotein oxidoreductase reaction http://purl.obolibrary.org/obo/REX_0000500 donor:iron protein oxidoreductase reaction http://purl.obolibrary.org/obo/REX_0000501 donor:iron-sulfur protein oxidoreductase reaction http://purl.obolibrary.org/obo/REX_0000500 donor:iron protein oxidoreductase reaction http://purl.obolibrary.org/obo/REX_0000503 NAD(P)H:NAD(P)+ transhydrogenase reaction http://purl.obolibrary.org/obo/REX_0000502 NAD(P)H:acceptor dehydrogenase reaction http://purl.obolibrary.org/obo/REX_0000504 NAD(P)H:hemoprotein dehydrogenase reaction http://purl.obolibrary.org/obo/REX_0000502 NAD(P)H:acceptor dehydrogenase reaction http://purl.obolibrary.org/obo/REX_0000505 NAD(P)H:oxygen dehydrogenase reaction http://purl.obolibrary.org/obo/REX_0000509 donor:oxygen oxidoreductase reaction http://purl.obolibrary.org/obo/REX_0000507 NAD(P)H:quinone dehydrogenase reaction http://purl.obolibrary.org/obo/REX_0000510 donor:quinone oxidoreductase reaction http://purl.obolibrary.org/obo/REX_0000538 hydrogen:cytochrome oxidoreductase reaction http://purl.obolibrary.org/obo/REX_0000534 hydrogenase reaction http://purl.obolibrary.org/obo/REX_0000513 metal:oxygen oxidoreductase reaction http://purl.obolibrary.org/obo/REX_0000511 metal oxidoreductase reaction http://purl.obolibrary.org/obo/REX_0000540 hydrogen:quinone oxidoreductase reaction http://purl.obolibrary.org/obo/REX_0000534 hydrogenase reaction http://purl.obolibrary.org/obo/REX_0000515 metal:flavin oxidoreductase reaction http://purl.obolibrary.org/obo/REX_0000517 donor:flavin oxidoreductase reaction http://purl.obolibrary.org/obo/REX_0000527 hemoprotein oxidoreductase reaction http://purl.obolibrary.org/obo/REX_0000511 metal oxidoreductase reaction http://purl.obolibrary.org/obo/REX_0000532 NADPH:metal oxidoreductase reaction http://purl.obolibrary.org/obo/REX_0000519 NAD(P)H:metal oxidoreductase reaction http://purl.obolibrary.org/obo/REX_0000533 NADH:metal oxidoreductase reaction http://purl.obolibrary.org/obo/REX_0000519 NAD(P)H:metal oxidoreductase reaction http://purl.obolibrary.org/obo/REX_0000528 hemoprotein:oxygen oxidoreductase reaction http://purl.obolibrary.org/obo/REX_0000527 hemoprotein oxidoreductase reaction http://purl.obolibrary.org/obo/REX_0000529 hemoprotein:nitrate oxidoreductase reaction http://purl.obolibrary.org/obo/REX_0000527 hemoprotein oxidoreductase reaction http://purl.obolibrary.org/obo/REX_0000547 proton tunnelling http://purl.obolibrary.org/obo/REX_0000546 tunnelling http://purl.obolibrary.org/obo/REX_0000548 electron tunnelling http://purl.obolibrary.org/obo/REX_0000546 tunnelling http://purl.obolibrary.org/obo/REX_0000001 process A phenomenon by which change takes place in a system. In physiological systems, a process may be chemical, physical or both. http://purl.obolibrary.org/obo/REX_0000048 electronation The complete transfer of one or more electrons to a molecular entity. http://purl.obolibrary.org/obo/REX_0000049 de-electronation The complete removal of one or more electrons from a molecular entity. http://purl.obolibrary.org/obo/REX_0000068 reaction stage A set of one or more (possibly experimentally inseparable) reaction steps leading to and/or from a detectable or presumed reaction intermediate. http://purl.obolibrary.org/obo/REX_0000078 catalysis The action of a catalyst. http://purl.obolibrary.org/obo/REX_0000087 transformation The conversion of a substrate into a particular product, irrespective of reagents or mechanisms involved. http://purl.obolibrary.org/obo/REX_0000118 synthase reaction X=Y + Z --> X-Y-Z http://purl.obolibrary.org/obo/REX_0000195 electrode reaction For an electrode process at a given potential the current is controlled by the kinetics of a number of steps which include the transport of reactants to and from the interface and the interfacial reaction itself. The latter, which is called the electrode reaction, must always include at least one elementary step in which charge is transferred from one phase to the other, but may also involve purely chemical steps within the interfacial region. http://purl.obolibrary.org/obo/REX_0000199 desorption The converse of adsorption, i.e. the decrease in the amount of adsorbed substance. http://purl.obolibrary.org/obo/REX_0000314 charge recombination Reverse of charge separation. http://purl.obolibrary.org/obo/REX_0000316 ion-pair return The recombination of a pair of ions R(+) and Z(-) formed from ionization of RZ. http://purl.obolibrary.org/obo/REX_0000336 annihilation An interaction between a particle and its antiparticle in which they both disappear. http://purl.obolibrary.org/obo/REX_0000383 photosensitization The process by which a photochemical change or photophysical process occurs in one (molecular) entity as a result of initial absorption of radiation by another (molecular) entity called a photosensitizer. In mechanistic photochemistry, the term is limited to cases in which the photosensitizer is not consumed in the reaction. http://purl.obolibrary.org/obo/REX_0000410 Na+ export Na+(in) --> Na+(out) http://purl.obolibrary.org/obo/REX_0000411 K+ import K+(out) --> K+(in) http://purl.obolibrary.org/obo/REX_0000436 reductive elimination The reverse of oxidative addition. http://purl.obolibrary.org/obo/REX_0000444 reduction The reverse of oxidation. http://purl.obolibrary.org/obo/REX_0000485 alcohol dehydrogenation R-CH(OH)-R' --> R-C(O)-R' + 2 e- + 2 H+ http://purl.obolibrary.org/obo/REX_0000543 magnesium-protoporphyrin IX 13-monomethyl ester hydroxylase reaction magnesium-protoporphyrin IX 13-monomethyl ester + NADPH + H+ + O2 --> 13(1)-hydroxy-magnesium-protoporphyrin IX 13-monomethyl ester + NADP+ + H2O http://purl.obolibrary.org/obo/REX_0000544 13(1)-hydroxy-magnesium-protoporphyrin IX 13-monomethyl ester dehydrogenase reaction 13(1)-hydroxy-magnesium-protoporphyrin IX 13-monomethyl ester + NADPH + H+ + O2 --> 13(1)-oxo-magnesium-protoporphyrin IX 13-monomethyl ester + NADP+ + 2 H2O http://purl.obolibrary.org/obo/REX_0000545 13(1)-oxo-magnesium-protoporphyrin IX 13-monomethyl ester cyclase reaction 13(1)-oxo-magnesium-protoporphyrin IX 13-monomethyl ester + NADPH + H+ + O2 --> divinylprotochlorophyllide + NADP+ + 2 H2O http://purl.obolibrary.org/obo/REX_0000000 physico-chemical process ontology http://purl.obolibrary.org/obo/REX_0000102 cheletropic elimination http://purl.obolibrary.org/obo/REX_0000374 migration http://purl.obolibrary.org/obo/REX_0000434 elimination reaction http://purl.obolibrary.org/obo/REX_0000443 electrocyclic ring opening http://purl.obolibrary.org/obo/REX_0000445 oxidation http://purl.obolibrary.org/obo/REX_0000519 NAD(P)H:metal oxidoreductase reaction http://purl.obolibrary.org/obo/rex#is_a is a http://purl.obolibrary.org/obo/rex#BY can be determined by http://purl.obolibrary.org/obo/rex#disjoint_from disjoint from http://purl.obolibrary.org/obo/rex#inverse_of inverse of http://purl.obolibrary.org/obo/rex#is_reverse_of is reverse of http://purl.obolibrary.org/obo/rex#part_of Part of