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Toxic Water Bloom of Blue-green Algae: Biological and Chemical Charactereristics. by WATANABE, Mariyo F.; HARADA, Ken-ichi is a Environmental Science article available to read on EtoBox.

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The death of livestock and wildlife owing to the ingestion of dense cells of bluegreen algae (cyanobacteria) has been reported in many countries of the world. Biological and chemical characteristics of toxins, mainly those found in Microcystis, were reviewed, since water blooms of Microcystis have occurred in most eutrophic lakes and ponds over a longer period of time than those of any other blue-green algae. The toxins in Microcystis (microcystins) are cyclic heptapeptides composed of two Lamino acids and five common ones with a molecular weight of around 1000. Microcystins RR (the pair of amino acids, arginine-arginine), YR (tyrosine-arginine) and LR (leucine and arginine), were the main components detected in the strains and natural samples of Microcystis in Japan. These three kinds of toxins were contained in the strains of M. viridis and L group of M. aeruginosa. The liver is the main target organ of microcystins. The livers of affected animals were engorged with blood showing hepatocyte necrosis. Neurotoxins were isolated from some species of Anabaena and Aphanizomenon. Anatoxin a in Anabaena is a secondary amine with a molecular weight of 166, and acts as a postsynaptic depo

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Author

WATANABE, Mariyo F.; HARADA, Ken-ichi

Publisher

Springer; The Japanese Society of Limnology; Japanese Society of Limnology (ISSN 0021-5104)

Published

1993

Language

EN

Field

Environmental Science (Physical Sciences)