| Green Sulfur Bacteria |
Article Index for Green |
Website Links For Green |
Information AboutGreen Sulfur Bacteria |
| CATEGORIES ABOUT GREEN SULFUR BACTERIA | |
| phototrophic bacteria | |
The green sulfur bacteria (Chlorobiaceae) are a Family of Phototrophic Bacteria . No other bacterial families are known to be closely related to them, and they are accordingly placed in their own Phylum (Chlorobi). The phylum is most closely related to Bacteroidetes . Green sulfur bacteria are generally nonmotile (one species has a Flagellum ), and come in spheres, rods, and spirals. Their environment must be oxygen-free, and they need light to grow. They engage in Photosynthesis , using Bacteriochlorophyll s ''c'', ''d'', and ''e'' in vesicles called Chlorosomes attached to the membrane. They use Sulfide ions as electron donor, and in the process the sulfide gets Oxidized , producing globules of elemental Sulfur outside the cell, which may then be further oxidized. (By contrast, the photosynthesis in plants uses water as electron donor and produces oxygen.) A species of green sulfur bacteria has been found living near a Black Smoker off the coast of Mexico at a depth of 2,500 meters beneath the surface of the Pacific Ocean . At this depth, the bacteria, designated GSB1, lives off the dim glow of the thermal vent since no sunlight can penetrate to that depth. REFERENCES EXTERNAL LINK |
|
|