While both chemotrophic and phototrophic organisms are plausible, almost all closed ecological systems to date are based on a phototroph such as green algae.
2.
""'Rhodopseudomonas faecalis " "'is a gram-negative, anaerobic, phototroph bacteria from the genus of Rhodopseudomonas with a polar flagella which was isolated from chicken faeces.
3.
However, " Prochlorochoccus " has evolved to use a unique light-harvesting complex, consisting predominantly of divinyl derivatives of chlorophyll a ( Chl a2 ) and b ( Chl b2 ) and lacking monovinyl chlorophylls and phycobilisomes . " Prochlorococcus " is the only known wild-type oxygenic phototroph that does not contain Chl a as a major photosynthetic pigment, and is the only known prokaryote with ?-carotene.
4.
"Rhodobacter capsulatus " a free-living anaerobic phototroph containing a transcriptional " nif " gene regulatory system . " R . capsulatus " regulates " nif " gene expression through " nifA " in the same manner described before, but it uses a different " nifA " activator which initiates the NtrC . NtrC activates a different expression of " nifA " and the other " nif " genes.
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