26015C

26015C
Caption: Rhodospirillum rubrum - Gram-negative, purple nonsulfur prokaryote (bacterium). Rhodospirillum rubrum is a purple-colored Proteobacterium from the family Rhodospirillaceae. Its purple color comes from cartenoid pigments - rhodovibrin and spirilloxanthin. It is a spiral-shaped bacterium that has polar flagella and can live both anaerobically and aerobically. Under anaerobic growth conditions (without oxygen) it can photosynthesize using light (referred to as a phototroph). As a phototroph, R. rubrum can grow autotrophically or heterotrophically. Photosynthesis by R. rubrum differs from that of plants - it does not have chlorophyll a, but bacteriochlorophyll. The carotenoids also help gather light energy for photosynthesis. Under aerobic growth conditions (with oxygen) it is called a chemotroph. R. rubrum is considered both heterotrophic and autotrophic. It is found in mud, pond water, and sewage samples. R. rubrum is used for studies in radiation resistance and nitrogen fixation and for the production of biological hydrogen fuel. Phototrophic purple nonsulfur bacteria are used in sewage treatment processes, for biomass production as a source of animal food or agricultural fertilizer.
Magnification*: x2,600
Type: SEM
Copyright 2007 Dennis Kunkel Microscopy, Inc.
Keywords: 03.01.07a,bacteria,bacterium,photosynthetic,photosynthetic bacteria,spiral,spirillum,photosynthetic bacterium,Rhodospirillum,spirilla,spiral shaped,spiral-shaped,Gram-negative,Gram negative,prokaryote,prokaryotes,carotenoid,carotenoids,carotenoid pigment,carotenoid pigments,rhodovibrin,spirilloxanthin,Proteobacterium,Proteobacteria,Rhodospirillaceae,Rhodospirillum rubrum,purple-colored bacterium,purple-colored bacteria,purple colored bacterium,nonsulfur bacterium,nonsulfur bacteria,purple nonsulfur bacterium,purple nonsulfur bacteria,flagellum,flagella,polar flagellum,polar flagella,anaerobic,aerobic,phototroph,phototrophs,phototrophic,chemotroph,chemotrophs,chemotrophic,autotroph,autotrophs,autotrophic,heterotroph,heterotrophs,heterotrophic,photosynthesis,photosynthesize,bacterium photosynthesis,bacteria photosynthesis,bacterial photosynthesis,radiation resistance,nitrogen fixtion,mud,pond water,fresh water,freshwater,SEM,sewage treatment,sewage,biomass production,animal food,agriculture fertilizer,fertilizer,agricultural fertilizer,hydrogen fuel production,hydrogen fuel,biological hydrogen,biological hydrogen fuel,26015C