Cyanobacteria


Cyanobacteria
A division of the kingdom Prokaryotae consisting of unicellular or filamentous bacteria that are either nonmotile or possess a gliding motility, reproduce by binary fission, and perform photosynthesis with the production of oxygen. These blue-green bacteria were formerly referred to as blue-green algae. SYN: Cyanophyceae.

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Cy·a·no·bac·te·ria (si″ə-no-bak-tērґe-ə) [cyano- + bacteria] the blue-green bacteria (formerly called blue-green algae), a phylum of unicellular or filamentous phototrophic organisms of the domain Bacteria that use water as an electron donor and produce oxygen in the presence of light. Cells are enclosed by a rigid wall containing peptidoglycan, are generally motile, and reproduce by fission. Photopigments include chlorophyll a and phycobilin proteins. Cyanobacteria are the only organisms that fix both carbon dioxide (in the presence of light) and nitrogen. Most species are photosynthetic and many are strong nitrogen fixers. Several species are common causes of water pollution and are often used as indicators of eutrophication of lakes and streams; see cyanobacteria poisoning, under poisoning.

Medical dictionary. 2011.

Look at other dictionaries:

  • Cyanobacteria — Temporal range: 3500–0 Ma Had n Archean …   Wikipedia

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  • cyanobacteria — [sī΄ə nō bak tir′ē ə] pl.n. sing. cyanobacterium [sī΄ə nō bak tir′ēəm] BLUE GREEN ALGAE …   English World dictionary

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  • Cyanobacteria — Cyanobakterien Zellfäden von Nostoc spp. Systematik Klassifikation: Lebewesen …   Deutsch Wikipedia

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  • cyanobacteria — blue green alga lue green al ga pl. {blue green al gae} [from the color and resemblance to algae.] any of a group of photosynthetic microorganisms possessing characteristics of both bacteria and plants. When classed as bacteria, they are… …   The Collaborative International Dictionary of English

  • cyanobacteria — /suy euh noh bak tear ee euh, suy an oh /, n.pl., sing. cyanobacterium / tear ee euhm/. Biol. blue green algae. [1975 80; CYANO 1 + BACTERIA] * * * or blue green algae Any of a large group of prokaryotic, mostly photosynthetic organisms. Though… …   Universalium


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