Aphanizomenon flos-aquae | definition of Aphanizomenon flos-aquae by Medical dictionary
Cyanobacteria (redirected from Aphanizomenon flos-aquae)
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the blue-green bacteria
(formerly called blue-green algae
), a subgroup of the kingdom Procaryotae, unicellular or filamentous phototrophic organisms that use water as an electron donor and produce oxygen in the presence of light. They 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.
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.
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.
cyanobacteria (formerly blue-green algae) a PHYLUM within the DOMAIN BACTERIA (see CLASSIFICATION). Cyanobacteria are a group of photosynthetic PROKARYOTES capable of OXYGENIC PHOTOSYNTHESIS. Some are also capable of ANOXYGENIC PHOTOSYNTHESIS. They were formerly called blue-green algae mainly because of the colour of many species, caused by a blue pigment called phycocyanin. They may also contain a red pigment called phycoerythrin. All members contain chlorophyll a. However, Prochloron additionally contains chlorophyll b (see CHLOROPHYLL). The cyanobacteria were possibly the first ORGANISMS on the earth to produce OXYGEN by photosynthesis. There is fossil evidence for their occurrence 3.5 x 109 years ago. The CELL WALL is analogous to that of Gram-negative BACTERIA (see GRAM'S STAIN and the LIGHT REACTIONS of photosynthesis occur on the THYLAKOID MEMBRANE system, within the cell. Other structures in the cell include carboxysomes, polyphosphate bodies as a PHOSPHATE reserve, and gas VACUOLES for buoyancy Some cyanobacteria are UNICELLULAR, others are filamentous (see FILAMENT (2)). They reproduce by fission or fragmentation. A number of species shows CELLULAR DIFFERENTIATION, with the formation of, for example, AKINETES, and specialized cells for NITROGEN FIXATION, called heterocysts. Cyanobacteria are widespread, being found in both terrestrial and aquatic environments that are illuminated. Some live in very inhospitable environments such as hot springs, where the temperature is in excess of 85 °C. They are responsible for much of the photosynthetic oxygen evolution in oceans and contribute to productivity through CARBON DIOXIDE fixation (see DARK REACTIONS) and NITROGEN FIXATION. Sometimes they accumulate in large numbers as BLOOMS on the surface of lakes, reservoirs and so on. These blooms may produce TOXINS.
References in periodicals archive
Antioxidant properties of a novel phycocyanin extract from the blue-green alga Aphanizomenon flos-aquae. Life Sciences 75,2353-2362.
Purification and characterization of phycocyanin from the blue-green alga Aphanizomenon flos-aquae. Journal of Chromatography B: Analytical Technologies in the Biomedical and Life Sciences 833,12-18.
Diversity of Aphanizomenon flos-aquae
(cyanobacterium) populations along a Baltic Sea salinity gradient.
Risk assessment of microcystin in dietary Aphanizomenon flos-aquae
. Ecotoxicol Environ Saf.
In warm summers in Muggelsee in Germany, a bloom of Aphanizomenon flos-aquae
is accompanied by the mass development of several Microcystis species (Teubner et al., 1999).
x x x Aphanizomenon flos-aquae
Komarek x x x Aphanocapsa sp.
Many of these products contain Aphanizomenon flos-aquae
, a BGA that is harvested from Upper Klamath Lake (UKL) in southern Oregon, where the growth of a toxic BGA, Microcystis aeruginosa, is a regular occurrence.
Dominant cyanobacterial species in the water blooms collected were Aphanizomenon flos-aquae
(L.) Ralfs and Woronichinia naegeliana (Ung.) Elenk.