purple bacteria


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purple bacteria

A colloquial term for the proteobacteria.

purple bacteria (Proteobacteria)

a PHYLUM (potentially of KINGDOM status) within the DOMAIN BACTERIA. see CLASSIFICATION. The purple bacteria include most of the Gram-negative bacteria (see GRAM'S STAIN), encompassing both photosynthetic and non-photosynthetic species. The photosynthetic bacteria are generally ANAEROBES (some are FACULTATIVE, others OBLIGATE). They contain BACTERIOCHLOROPHYLL and the purple PROTEIN bacteriorhodopsin. PHOTOSYNTHESIS is ANOXYGENIC. The purple sulphur photosynthetic bacteria use sulphur compounds, such as hydrogen sulphide, instead of water, and produce sulphur granules instead of OXYGEN. The purple non-sulphur photosynthetic bacteria use organic compounds such as acids. Non-photosynthetic bacteria include ENTEROBACTERIA, RHIZOBACTERIA, AGROBACTERIA, RICKETTSIA, MYXOBACTERIA and some of the SULPHATE-REDUCING AND SULPHUR-REDUCING BACTERIA.
References in periodicals archive ?
"This demonstrates that purple bacteria can be used to recover valuable biofuel from organics typically found in wastewater -- malic acid and sodium glutamate -- with a low carbon footprint," reports Esteve-Nunez.
Specifically, the Grid Technology Research Center and the Research Institute for Computational Sciences, both AIST organizations, have jointly calculated the electron density of the membrane protein complex of Rhodopseudomonas viridis, a kind of photosynthetic purple bacteria, using the AIST SuperCluster, AIST's proprietary cluster computer.
Anaerobic oxidation of ferrous iron by purple bacteria, a new type of phototrophic metabolism.
An example is the modification of the electron affinity of the reaction center pigment in purple bacteria. Jim Allen and JoAnn Williams at Arizona State University have found that creating or deleting noncovalent hydrogen bonds between the protein and the pigment changes this electron affinity in a rather predictable manner.