User:Katiek16/Chlorobium tepidum

=Natural Habitat and Environmental Requirements
Like other green photosynthetic bacteria C.tepidum requires light and specific compounds to perform anoxygenic photosynthesis. The compounds that C.tepidium requires are "H2, reduced sulfur compounds (such as H2S, S0, or thiosulfate), or ferrous iron". These copounds are used to reform redox rections and provide energy to fix CO2 via the reverse tricarboxcylic acid cycle. To fulfill their metabolic requirements, they reside primarily in anaerobic sulfur rich environments such as “anoxic layers of stratified lakes and lagoons, the anoxic layers of bacterial mats in intertidal sediments, and microbial communities associated with sulfide-containing hot springs” C.tepidum and other green sulfur bacteria play a large role within the carbon, nitrogen and sulfur cycles

Photosynthetic Mechanism

As it was mentioned before, C.tepidum performs anoxygenic photosynthesis. Within each C.tepidium cell there are 200-250 chlorosomes that are located on the cytoplasmic side of the inner cell membrane, which are attached to reaction centers that are inserted within the membrane. The ellipsoidal shaped complexes act as light harvesting antenna to capture energy used in oxidation of their electron sources. Within each chlorosomes are 215,000  +- 80,000 bacteriochlorophyll C. Light energy is harvested by the chlorosomes and used in conjunction with H2, reduced sulfur compounds, or ferrous iron to preform redox reactions and provide energy to fix CO2 via the reverse tricarboxcylic acid cycle