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Index >> Bacterial Taxonomy >> Cyanobacteria

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Bacterial Taxonomy Bacterial Taxonomy Part 2 Cyanobacteria Division II Bacteria Phototrophic Bacteria Gliding Bacteria Sheated Bacteria Budding and OR Appendaged Bacteria Spirochetes Spiral and Curved Bacteria Gram Negative Aerobic Rods and Cocci Gram Negative Facultatively Anerobic Rods Gram Negative Anerobic Bacteria Gram Negative Cocci and Coccobacilli

Cyanobacteria

	Tabular Form of Bacterial Classification From David Bergey's Manual This consists of phototrophic procaryotic organisms which use water as an electron donor in photosynthesis. Cells are enclosed by a rigid multilayered wall with an inner peptidoglycan layer. The cell wall may be surrounded by a gelatinous or fibrous sheath. Most members of the cyanobacteria show a gliding motility at some stage of development. The cytoplasm is traversed extensively by thylakoids, the outer Surfaces bear characteristic granules called phycobilisomes which Contain phycobilin protein pigments.
Characteristic photo pigments include chlorophylla and phycobilin proteins such as allophycoeyanin, phycoeyanin and sometimes phycoerythrin. Some are unicellular, Others contain chains of cells, either simple or branched. Unicellular forms reproduce by binary fission or by multiple fission or by the serial release of apical cells called exospores from a sessile individual filamentous forms grow by repeated intercalary cell division and reproduce either by random fragmentation of the filament or by the terminal release of short motile chains of cells (hormogonia). Some filamentous forms also produce specialized cells called akinetes and heterocysts. Akinetes are larger than the vegetative cells and represent a resting stage, which on germination release the hormogonia.
Heterocysts are non-reproductive cells and are characterized by the presence of refractile polar granules and a thick outer wall. The ability to fix N2 aerobically gives the cyano bacteria the advantage over many others and enables them to live under a variety of conditions. Sometimes these bacteria also form effective symbiosis with fungi or plants as in lichens and azolla.

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Bacterial Taxonomy Part 2 Gram Negative Anaerobic Cocci Gram Negative Chemolithotophic Bacteria Methane Producting Bacteria Gram Positive Cocci Features of Gram Negative Cocci and Coccobacilli Features of Nitrifying Bacteria Characters of Bacteria Metabolising Sulphur and Sulphur Compounds Characteristics of Methane Producing Bacteria Characteristics of Family Micrococcaceae

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