Some Properties of the Sheath Material of Microcystis

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The sheath material of Microcystis was analyzed to discuss its potential role for the water-bloom caused by Microcystis. The cells of Microcystis were collected from Lake Suwa on the 5th September, 1980 and on the 20th August, 1981,when the water-blooms were observed. Its sheath material was analyzed for its major constituents, i. e. carbohydrates and proteins. The carbohydrates of the sheath material consisted of glucose, xylose, galactose, rhamnose, fucose, mannose, glucuronic acid and galacturonic acid in the ratios of approximately 5 : 3 : 1.5 : 2 : 1.5 : 1 : 3 : 3 for Sample I obtained in 1980,and 3.5 : 4 : 3 : 1.5 : 0.7 : 0.5 : 3 : 3 for Sample II obtained in 1981. Two samples of sheath material were somewhat different in the ratios of monosaccharides. The major components of protein were acidic amino acids (aspartic acid and glutamic acid) and hydrophylic amino acids (threonine, glysine and serine). The sum of both amino acid groups was above 50% of the protein and the basic amino acids occurred only at low percentage. When two samples of sheath material were applied to ion exchangers, it was found that the sheath material was adsorbed on anion exchanger, but not on cation exchanger. This indicated that they had a negative charge.
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