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Overmann, J. 2008. Green Nonsulfur Bacteria. eLS. .

These carotenoids may be purple, red, brown or orange in colour and give the bacteria their characteristic
colouration.

Purple bacteria are Gram negatives and so possess a double membrane in the cell envelope.

The purple bacteria are good examples to illustrate many of the features.Recall that

Castenholz RW and Pierson BK (1995) Ecology of thermophilic anoxygenic phototrophs. In: Blankenship RE, Madigan MT and Bauer CE (eds) Anoxygenic Photosynthetic Bacteria, pp. 87–103. Dordrecht: Kluwer Academic Publishers.

In most purple bacteria, including

Ivanovsky RN, Sintsov NV and Kondratieva EN (1980) ATP‐linked citrate lyase activity in the green sulfur bacterium Chlorobium limicola forma thiosulfatophilum. Archives of Microbiology 128: 239–241.

Imhoff JF and Bias‐Imhoff U (1995) Lipids, quinones and fatty acids of anoxygenic phototrophic bacteria. In: Blankenship RE, Madigan MT and Bauer CE (eds) Anoxygenic Photosynthetic Bacteria, pp. 179–205. The Netherlands: Kluwer Academic Publishers.

Green sulfur bacteria - Wikipedia

THE ABOVE RIGHT PHOTO shows a plate streaked from an enrichment and then incubated anaerobically in the light. Note the pigmented colonies of purple non-sulfur photosynthetic bacteria.

We shall look at the system in purple
bacteria in more detail in the 'Photosynthesis' section below.

The terms used in describing the energy metabolism of organisms can be very confusing at first, so lets look at a few
more key terms:

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Photosynthesis in the Green Sulfur Bacteria

Imhoff JF (2011) Functio nal gene studies of pure cultures are the basis of systematic studies of environmental communities of phototrophic bacteria and their species specific analyses. BISMiS Bulletin 2: 107–115.

The green sulfur bacteria use PS I for photosynthesis

Isolation of purple non-sulfur bacteria is accomplished easily by adding the source material to a liquid enrichment medium in a stoppered bottle. The final volume attained can be approximately 5-25% inoculum (a lower amount if a solid sample is used) with the medium filling up the rest of the container such that no air bubbles are trapped. These enrichments are placed near a tungsten light (one or more common desk lamps) at room temperature to 30°C. Once the enrichment has achieved turbidity with the consequent bloom, it is streaked onto plates which are then incubated anaerobically near the light source.

Green nonsulfur (gliding) bacteria

Kumar PA, Srinivas TRN, Sasikala C et al. (2009) Prosthecochloris indica sp. nov., a novel green sulfur bacterium from a marine aquaculture pond, Kakinada, India. Journal of General and Applied Microbiology 55: 163–169.

Green and Purple Sulfur Bacteria - Biotech Articles

Oxygenic photosynthesis occurs in, among others, eukaryotic microorganisms like algae and in bacteria such as cyanobacteria; the same mechanism is at work in both. Electron flow happens through two different electron transport chains that are connected; together, these electron transport chains are called the . The stars of each chain are photosystem I (PSI) and photosystem II (PSII), each containing chlorophyll reaction centers surrounded by antenna pigments.

Bacteriology 102 - Purple Non-Sulfur Photosynthetic Bacteria

Holkenbrink C, Ocón Barbas S, Mellerup A, Otaki H and Frigaard N‐U (2011) Sulfur globule oxidation in green sulfur bacteria is dependent on the dissimilatory sulphite reductase system. Microbiology 157: 1229–1239.

photosynthetic bacteria that possess this type of ..

Purple bacteria contain bacteriochlorophyll type a or b as the primary light-sensitive pigment in the
reaction centres and antennae, and in the antenna carotenoids enhance the range of wavelengths of light that can be
harnessed.

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