Microbial Removal of Cadmium from Waste Tissues of Scallop

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  • ホタテガイ廃棄組織からの微生物的カドミウム除去
  • ホタテガイ ハイキ ソシキ カラ ノ ビセイブツテキ カドミウム ジョキョ

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Abstract

Microbial removal of cadmium from a waste tissue (hepatopancreas) of a scallop was examined. During a sequential and mixed cultivation of soil microbes and a strain of sulfate-reducing bacteria in an extract of the tissue, cadmium was removed completely from the extract as the metal-sulfide precipitated. Whereas a significant amount of cadmium remained in the extract after the cultivation of soil microbes or the sulfate-reducing bacterium alone.<BR>These results suggested that protein-bound cadmium in the tissue extract would be transformed to a free-state by enzymes like proteases secreted by soil microbes, and then, metal sulfide could be formed with the free-cadmium and hydrogen sulfide produced by the sulfate-reducing bacterium. Availability of the cadmium-free preparation as feed was also discussed.

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