cell population phenotype abolished cell division timing change upon nitrogen source shift 2015-07-10T14:37:09Z abolished nutritional modulation of cell division abolished change in cell division timing upon nitrogen source shift abolished cell division rate change upon nitrogen source shift midori A phenotype in which a cell does not alter the timing or rate of cell division when shifted from one nitrogen source to another. Normally, cell division is delayed upon shifting from a poor to a rich nitrogen source, and accelerated upon shifting from a rich to a poor nitrogen source. FYPO:0004701 This phenotype is typically observed at the population level. Good (or rich) nitrogen sources are distinguished from poor sources based on how readily nitrogen is assimilated into cellular metabolism. In microorganisms, good nitrogen sources generally support higher cell population growth rates than poor sources. In fission yeast, cells divide at a smaller size when grown on a poor nitrogen source than in nitrogen-rich media; proline is commonly used as a poor nitrogen source. unchanged cell division timing upon nitrogen source shift abolished change in cell division rate upon nitrogen source shift