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In Rhodopseudomonas palustris, an arsM gene, encoding bacterial and archaeal homologues of the mammalian Cyt19 As(III)
S-adenosylmethionine methytransferase, was regulated by arsenicals. An expression of arsM was introduced into strains for the
methylation of arsenic. When arsM was expressed in Sphingomonas desiccabilis and Bacillus idriensis, it had 10 folds increase
of methyled arsenic gas compared to wild type in aqueous system. In soil system, about 2.2%–4.5% of arsenic was removed by
biovolatilization during 30 days. This study demonstrated that arsenic could be removed through volatilization from the contaminated
soil by bacteria which have arsM gene expressed. These results showed that it is possible to use microorganisms expressing arsM as an
inexpensive, efficient strategy for arsenic bioremediation from contaminated water and soil. 相似文献
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号称“世界屋脊”的青藏高原,历来披着一层神秘面纱为世人所瞩目。然而不少人还不知道,在这块谜一般的高原上还有一片更神奇的土地,这就是平均海拔5000米以上的羌塘高原无人区。这里空气稀薄,气候寒冷,猛兽出没,过去连勇敢的旅行家和探险者都望而生畏。 相似文献
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广西大明山自然保护区哺乳动物资源调查研究 总被引:1,自引:0,他引:1
2000年9月11日至26日,在广西省大明山自然保护区采集哺乳动物81只(种),共计19种,隶属5目,11科.结合以往的调查资料,已知大明山自然保护区有哺乳动物动物60种,隶属8目,22科,47属.保护区内的哺乳动物多样性系数(H”)为2.5555,均匀度指数(J)为O.8679,动物的密度为231.23只/km2. 相似文献