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Nickel and cobalt removal capacities of native metal-resistant bacteria

机译：天然金属抗菌细菌的镍和钴去除能力

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Genetic determinants for heavy metal resistance could be exploited in the design of bioprocesses for environmental cleanup. The removal of Ni(II), Co(II), Cr(VI) and Mn(II) was investigated using Serratia marcescens strains C-1, C4, 16 and Kluyvera sp. Nic3 isolated from nickel deposits in Moa, Holguin (Cuba). The high nickel and cobalt resistance of S. marcescens C-1 is based on the NreB-genetic determinant ncrABC, which encodes histidine-rich proteins, NcrA, NcrB and NcrC. NcrC is a Ni(II)/Co(II) uptake protein. In this work the presence of ncrAB fragment in S. marcescens C4, 16 and Kluyvera sp. Nic3 was determined by PCR. ncrAB fragment was efficiently amplified from genomic DNA of the strains C4 and 16 but not from strain Nic3. Strains C4, 16 and C-1 showed the highest resistance to Ni(II) and Co(II). The Ni(II)/Co(II) removal capacities of C4, 16 and C-1 strains were two times higher than that by Nic3 (12.88 mg of Ni(II)/g of biomass and 9.77 mg of Co(II)/g of biomass). Uptake of Cr(VI) and Mn(II) was not observed for any of these strains. pH value has an important influence on the Ni(II) and Co(II) removal capacity of S. marcescens C-1. Additional studies are currently in progress aimed to check the metal removal efficiency of strain C1 in batch reactors.
机译：重金属抗性的遗传决定可以在生物过程中用于环境净化的设计来利用。使用粘质沙雷氏菌菌株C-1，C 4，16和SP克吕沃尔Ni的除去（II），钴（II），铬（VI）和Mn（II）进行了研究。 NIC3从莫阿，奥尔金（古巴）的镍矿中分离。 S的高镍和钴电阻沙雷氏菌C-1是基于NreB-遗传决定ncrABC，其编码富含组氨酸的蛋白质，NCRA，NCRB和NCRC。 NCRC是Ni（II）/钴（II）摄取蛋白。在这项工作中ncrAB片段的S中的粘质沙雷氏菌的存在C4，16和SP克吕沃尔。 NIC3通过PCR确定。 ncrAB片段有效地从菌株C4和16的基因组DNA扩增但不从菌株NIC3。菌株C4，16和C-1显示出与Ni（II）和Co（II）的最高阻力。在Ni（II）/钴（II）C4，16和的去除能力C-1菌株比两倍更高由NIC3（12.88毫克镍（Ⅱ）/ g生物质和9.77毫克的Co（II）/生物质的克）。铬（VI）和Mn（II）的摄取不对任何这些菌株的观察。 pH值对在Ni（II）和S的钴（II）除去能力具有重要的影响粘质沙雷氏菌C-1。另外的研究目前正处于针对检查菌株C1的金属去除效率在间歇式反应器的进展。

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