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 (sī′ə-nō-băk-tîr′ē-əm, sī-ăn′ō-)
n. pl. cy·a·no·bac·te·ri·a (-tîr′ē-ə)
Any of various photosynthetic bacteria of the phylum Cyanobacteria that are generally blue-green in color and are widespread in marine and freshwater environments, with some species capable of nitrogen fixation. Also called blue-green alga, blue-green bacterium.


pl n, sing -rium (-rɪəm)
(Microbiology) a group of photosynthetic bacteria (phylum Cyanobacteria) containing a blue photosynthetic pigment. Former name: blue-green algae

blue′-green` al′gae
any of various groups of prokaryotic microorganisms of the phylum Cyanophyta, containing chlorophyll and a blue pigment. Also called cyanobacteria.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.cyanobacteria - predominantly photosynthetic prokaryotic organisms containing a blue pigment in addition to chlorophyllcyanobacteria - predominantly photosynthetic prokaryotic organisms containing a blue pigment in addition to chlorophyll; occur singly or in colonies in diverse habitats; important as phytoplankton
eubacteria, eubacterium, true bacteria - a large group of bacteria having rigid cell walls; motile types have flagella
class Cyanobacteria, class Cyanophyceae, Cyanophyceae - photosynthetic bacteria found in fresh and salt water, having chlorophyll a and phycobilins; once thought to be algae: blue-green algae
nostoc - found in moist places as rounded jellylike colonies
trichodesmium - large colonial bacterium common in tropical open-ocean waters; important in carbon and nitrogen fixation
References in periodicals archive ?
(1997) recommended that the three prochlorophyte genera be allocated to
prochlorophyte genera, recognizing that they are organisms of
Competition between a prochlorophyte and a cyanobacterium under various phosphorus regimes: comparison with the Droop model.
Chisholm has succeeded in growing the new prochlorophyte in culture, but she has yet to isolate this finicky plant--a necessary step before it can be given taxonomic name.
It is unclear what animals eat this prochlorophyte, but as an abundant source of biomass it helps form the basis for marine ecology, Chisholm says.
Seven different phytoplankton taxa (namely diatoms, cyanobacteria, prymnesiophytes, dinoflagellates, chlorophytes, chrysophytes, prochlorophytes), determined by High Performance Liquid Chromatography (HPLC), were consistently present in the coastal waters during 2008-2011.
The subtropical gyre is an oligotrophic region with very low chlorophyll-a (Chl-a) concentrations in which the phytoplankton community is dominated by species of picoplankton (e.g., prochlorophytes and cyanophytes) and nanoplankton (Ras et al., 2008).
The presence of each type of chlorophyll in water is an indication for the presence of different algal and higher plant life, in which chl a is present in all photosynthetic algae and higher plants, chl b in higher plants and symbiotic prochlorophytes on the other hand chl c is present in chromophyte algae and brown seaweeds.
It was a legitimate "Eureka moment," signifying the discovery of a previously unknown kind of organism known as prochlorophytes. But it also offered the tantalizing possibility of an even more momentous, heart-thumping discovery: how the first plant on Earth evolved.
For simplicity and also for historical reasons, they are known by the generic name of phytoplankton (plant plankton), even though the organisms present include some prokaryotes (bacteria and prochlorophytes) now classified as Monera and some eukaryotes ("microalgae") now classified as Protoctista (see also volume 1, page 75 and volume 10, page 56).
In 1988 Olson and Penny Chisholm (MIT) discovered a new and highly abundant group of picoplankton in the open ocean called "prochlorophytes." These previously unknown organisms are now understood to be responsible for a huge fraction of the productivity of open ocean systems.