Accumulation of Biogenic Iron Hydroxides by Leptothrix ochracea at Neutral pH

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  • 中性ｐＨに生息するＬｅｐｔｏｔｈｒｉｘ　ｏｃｈｒａｃｅａの鉄濃集作用
  • チュウセイ pH ニ セイソク スル Leptothrix ochracea ノ テツノウシュウ サヨウ

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Abstract

Iron bacteria precipitate copious amounts of iron hydroxides in microbial mats normally inhabiting in ironrich water. In this study, the following findings were made on accumulation of Fe and the formation of ironsheath regarding L. ochracea, an iron bacterium which is one of the most common inhabitants of iron microbial mats at neutral pH collected from underground water, by an electron microscopic observation:<BR>(1) In a field experiment, the rate of inorganic precipitation is 1.6, and the rate of precipitation involving iron bacteria is 8.4, so that iron oxidizing bacteria are precipitating iron hydroxides in an amount five times or more of the inorganic precipitates.<BR>(2) By metabolic pathway of live L. ochracea, the iron sheath can be formed in a short time period.<BR>(3) UV-C treatment destroys the iron bacterial cells, thereby inhibiting the formation of iron-microbial mats.<BR>(4) At an early formation stage of iron- sheath of L. ochracea, a fine fibrous network structure is formed around the cell wall. The tubular sheath is composed of thicken fibrous materials.<BR>(5) By the metabolism of the iron bacterium, the oxidized Fe3+ is accumulated in the fine fibrous polysaccharide, thereby forming a sheath made of a complex of iron and an organic substance.<BR>(6) The fine particles of iron hydroxide found on the surface of the sheath are particles of iron hydroxide oxidized inorganically.<BR>(7) The matured sheath fixes low-crystalline ferrihydrite minerals in microbial mats.

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