has value specification starting optical density measurement variable precision_fermentation precision fermentation process starting optical density measurement variable The starting OD measurement is either measured (by taking a sample after inoculation and measuring the cell density spectophotometrically at 600nm or 900nm wavelength) or calculated (by knowing the final OD of the seed culture, volume inoculated and final cultivation volume). PREFER:0000034 starting OD measurement variable A precision fermentation process measurement variable that indicates the initial optical density (OD) of the fermentation culture from a bioreactor or fermentation system during a fermentation process. optical density cultivation condition unit of optical density precision fermentation process measurement variable