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Title of Journal: World J Microbiol Biotechnol

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Abbravation: World Journal of Microbiology and Biotechnology

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Springer Netherlands

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DOI

10.1016/0006-8993(90)90732-q

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1573-0972

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Isolation and the interaction between a mineralwe

Authors: Rong Rong Wang Qi Wang Lin Yan He Gang Qiu Xia Fang Sheng
Publish Date: 2015/02/26
Volume: 31, Issue: 5, Pages: 747-753
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Abstract

The purposes of this study were to isolate and evaluate the interaction between mineralweathering bacteria and silicate minerals feldspar and biotite A mineralweathering bacterium was isolated from weathered rocks and identified as Rhizobium tropici Q34 based on 16S rRNA gene sequence analysis Si and K concentrations were increased by 13 to 40fold and 11 to 17fold in the live bacteriuminoculated cultures compared with the controls respectively Significant increases in the productions of tartaric and succinic acids and extracellular polysaccharides by strain Q34 were observed in cultures with minerals Furthermore significantly more tartaric acid and polysaccharide productions by strain Q34 were obtained in the presence of feldspar while better growth and more citric acid production of strain Q34 were observed in the presence of biotite Mineral dissolution experiments showed that the organic acids and polysaccharides produced by strain Q34 were also capable of promoting the release of Si and K from the minerals The results showed that the growth and metabolite production of strain Q34 were enhanced in the presence of the minerals and different mineral exerted distinct impacts on the growth and metabolite production The bioweathering process is probably a synergistic action of organic acids and extracellular polysaccharides produced by the bacterium

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