[Growth of phototrophic bacterium Rhodobacter sphaeroides and formation of carotenoids on mineral water "Dzhermuk"].

A possibility to use thermal carbon sulphate-hydrocarbonate mineral waters "Dzhermuk" as the basis of nutrient medium for growing has been established. No distinct correlation was observed between biomass accumulation and carotenoids formation: maximum yields of the biomass is registered under microaetrophilic growth conditions, while that of carotenoids--under anaerobic conditions. Maximum synthesis of carotenoids is observed at illumination of 1000-1500 lx, more intensive illumination (3000 lx) results in the decrease of their synthesis. Spheroiden, which makes up about 40-45% of the total amount of carotenoids, is predominant. The biomass drying and storage period (2 yr.) affect inconsiderably the quantitative composition of pigments.