细菌富集金的实验及其地球化学意义

细菌富集金的实验表明，细菌具有强烈富集金的能力，起到了海水中微量金捕集器的作用。细菌富集金有吸附和吸收两种形式。吸附是指金被细胞壁分泌的氨基酸等有机物吸附在生物体外；吸收是指金进入生物体内，可能与蛋白质的巯基相结合。细菌是自然界生活力，繁殖力极强，生物产量巨大的微生物。

SIMULATION EXPERIMENTS ON ENRICHMENT OF GOLD BY BACTERIA AND THEIR GEOCHEMICAL SIGNIFICANCE

The experiments on enrichment of gold by bacteria indicate that bacteria have a very intense enrichment capacity for gold and act as an arrester of trace gold in sea water. Bacteria enrich gold in two forms: absorption and adsorption. Absorption means that gold comes inside organisms and is combined with the mercapto group of protein, whereras adsorption means that gold is ad-sorped outside organisms by aminoacid secreted by cell walls. Bacteria are organisms with very high vitality and reproductive capacity and huge productivity in nature. Bacteria, which are important geological agents for gold enrichment and exert effects on geological environments by their metabolism, are of important geochemical significance for the formation of gold-bearing black rocks.