知识与财富的链接
铀的微生物成矿作用研究尚处于实验研究阶段。微生物富集铀的机制可分为代谢性和非代谢性两类。前与代谢产生的酶、化学配位体、排泄物对铀酰的络合、还原有关；后是由细胞的负电位与带正电荷的UO2^2 间产生生理-化学作用，导致铀的生物吸附、吸收、离子交换和沉淀。它与微生物的代谢、活力无关。综述了厌氧菌、喜氧菌富集铀的实验结果、富集机制和今后研究的发展趋向。
Results of experimental studies for microbial uranium accumulation by anaerobic and aerobic bacteria,as well as mechanisms and developing tendency of microbial uranium accumulation are discussed in the present paper.Up to now,the study on microbe metallogenesis of uranium has been at an experimental stage in laboratory.Mechanisms of microbial uranium accumulation are divided into two types:those that are metabolism dependent and those that are metabolism independent.Metabolism dependent uranium accumulation consists of extracellular precipitation with metabolically produced ligands,complexation arising from excreted metabolites, or precipitation due to enzyme mediated changes in reduction state.Metabolism dependent accumulation can also involve active pumping of metals,leading to intracellular accumulation.Metabolism independent accumulation involves a physio chemical interaction between cationic uranium species and negatively charged sites in microorganisms,and can occur whether cells are living or non living(even in cell wall fragments).
