Interactions between <Emphasis Type="Italic">Bacillus mucilaginosus</Emphasis> and silicate minerals (weathered adamellite and feldspar): Weathering rate,products, and reaction mechanisms |
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| Authors: | Binbin Mo Bin Lian |
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| Institution: | (1) The Key Laboratory of Bioactive Material, Ministry of Education, China, Life Science College, Nankai University, Tianjin, 300071, China;(2) Institute of Soil and Fertilizer, Chinese Academy of Agricultural Sciences, No. 30 Baishi QialLu, HaiDian District, Beijing, 100081, China;(3) Department of Pathobiology, College of Veterinary Medicine, Auburn University, Auburn, AL 36849, USA; |
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| Abstract: | Bacillus mucilaginosus is a common soil bacterium, and usually used as a model bacterium in studying microbe-mineral interactions. Several reaction
mechanisms of B. mucilaginosus weathering silicate minerals were proposed. However, the molecule mechanisms and detailed processes were still unclear. In
this paper, bacteriummineral interactions were studied in terms of variations in pH value over the experimental period, variations
in mineral composition, weathering rates of silicate minerals and volatile metabolites in the culture medium, etc., to further
explore the bacterium-mineral interaction mechanisms. The results showed that B. mucilaginosus could enhance silicate mineral weathering obviously. The weathering rates were quite different for various kinds of silicate
minerals, and the weathering rate of weathered adamellite could reach 150 mg/m2/d. Although B. mucilaginosus produced little acidic substance, pH in the microenvironment of bacterium-mineral complex might be far lower than that of
the circumjacent environment; a large amount of acetic acid was found in the metabolites, and was likely to play an important
role as a ligand. These results appear to suggest that acidolysis and ligand degradation are the main mechanisms of B. mucilaginosus dissolving silicate minerals, the formation of bacterium-mineral complexes is the necessary condition for the bacteria weathering
silicate minerals, and extracelluar polysaccharides played important roles in bacterium-mineral interaction processes by forming
bacterium-mineral complexes and maintaining the special physicochemical properties of microenvironment. |
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| Keywords: | Bacillus mucilaginosus silicate mineral interaction weathering rate mechanism |
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