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The prefix cyan comes from the Greek κύανoς meaning "a dark blue substance", [19] and usually indicates any of a number of colours in the blue/green range of the spectrum. Cyanobacteria are commonly referred to as blue-green algae. Traditionally they were thought of as a form of algae, and were introduced as such in older textbooks.
Cyanobacteria (blue-green algae) bloom on Lake Erie (United States) in 2009. These kinds of algae can cause harmful algal bloom. A harmful algal bloom (HAB), or excessive algae growth, is an algal bloom that causes negative impacts to other organisms by production of natural algae-produced toxins, water deoxygenation, mechanical damage to other organisms, or by other means.
Protothecosis, otherwise known as Algaemia, is a disease found in dogs, cats, cattle, and humans caused by a type of green alga known as Prototheca that lacks chlorophyll and enters the human or animal bloodstream. It and its close relative Helicosporidium are unusual in that they are actually green algae that have become parasites. [1]
Blue-Green Algae (Cyanobacteria) and their Toxins (Health Canada) Toxic cyanobacteria in water: A guide to their public health consequences, monitoring, and management (WHO) Cyanobacteria and Cyanotoxins: Information for Drinking Water Systems (EPA) Cyanobacteria Are Far From Just Toledo's Problem By Carl Zimmer, Aug. 7, 2014(The New York Times)
The protoplast is a light blue-green color, appearing dark or brown due to optical effects of gas-filled vesicles; this can be useful as a distinguishing characteristic when using light microscopy. These vesicles provide the buoyancy necessary for M. aeruginosa to stay at a level within the water column at which they can obtain optimum light ...
The Chinese general Zhu-Ge Liang was the first to observe cyanobacteria poisoning about 1000 years ago. He reported the death of troops who drank green coloured water from a river in southern China. [citation needed] The first published report of an incidence of cyanobacteria poisoning dates from the poisoning of an Australian lake in 1878. [24]
Algaemia is a secondary term that refers to the emerging condition in which green algae enter the bloodstream. Members of the genus Prototheca are the most common algae that leads to algaemia. Prototheca and Chlorella , which is extremely rare, are the only two known algae genera capable of inflicting disease on mammals, including humans ...
Microcystis wesenbergii colony under epifluorescence microscopy with SYTOX Green DNA staining Microcystis floas-aquae Kirch.. Microcystis is capable of producing large surface blooms through a combination of rapid division and buoyancy regulation by production of gas-filled vesicles.