Decomposition of silicate minerals by Bacillus mucilaginosus in liquid culture
Abstract
The extraction of K+ and SiO2 from silicate minerals by Bacillus mucilaginosus in liquid culture was studied in incubation experiments. B. mucilaginosus was found to dissolve soil minerals and mica and simultaneously release K+ and SiO2 from the crystal lattices. In contrast, the bacterium did not dissolve feldspar. B. mucilaginosus also produced organic acids and polysaccharides during growth. The polysaccharides strongly adsorbed the organic acids and attached to the surface of the mineral, resulting in an area of high concentration of organic acids near the mineral. The polysaccharides also adsorbed SiO2 and this affected the equilibrium between the mineral and fluid phases and led to the reaction toward SiO2 and K+ solubilization. These two processes led to the decomposition of silicate minerals by the bacterium.
Keywords
Bacillus mucilaginosus dissolution mechanism K+ release silicate mineralsPreview
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References cited
- Berthelin J, Belgy G, 1979 Microbial degradation of phyllosilicates during simulated podzolization Geoderma 21: 297–310CrossRefGoogle Scholar
- Bu XH, Feng PY, Gier TE, Stucky GD, 1998 Synthesis and crystal structure of feldspar analogs in beryllosilicate and aluminum–cobalt phosphate systems Micropor Mesopor Mat 23: 323–330CrossRefGoogle Scholar
- Grudev S, 1987 Use of heterotrophic microorganisms in mineral biotechnology Acta Biotechnol 7: 299–306CrossRefGoogle Scholar
- Institute of Soil Science, Chinese Academy of Sciences, Nanjing. 1985 Methods of Soil Microorganism Research. Beijing: Science Press, 51–57; 154–162. ((In Chinese))Google Scholar
- Lian B, 1998 Study on Silicate Bacteria Dissolves Potassium. Guiyang: Guizhou Science and Technology Press, pp. 103–108Google Scholar
- Malinovskaya IM, Kosenko LV, Votselko SK, Podgorskii VS, 1990 Role of Bacillus mucilaginosus polysaccharide in degradation of silicate minerals Mikrobiologiya 59: 49–55Google Scholar
- Mera MU, Beveridge TJ, 1993 Mechanism of silicate binding to the bacteria cell wall in Bacillus subtilis J Bacteriol 175: 1936–1945Google Scholar
- Vandevivere P, Welch SA, Ullman WJ, Kirchman DL, 1994 Enhanced dissolution of silicate minerals by bacteria at near-neutral pH Microb Ecol 27: 241–251CrossRefGoogle Scholar
- Vainberg SN, Vlasov AS, Skripnik VP, 1980 Enrichment of clay raw material using silicate bacteria USSR Tr.-Mosk. Khim.-Tekhnol. Inst. im. D.I. Mendeleeva 116: 34–37Google Scholar
- Welch SA, Barker WW, Banfield JF, 1999 Microbial extracellular polysaccharides and plagioclase dissolution Geochimica et Cosmochimica Acta 63: 1405–1419CrossRefGoogle Scholar
- Welch SA, Ullman WJ, 1993 The effect of organic acids on plagioclase dissolution rates and stoichiometry Geochimica et Cosmochimica Acta 57: 2725–2736CrossRefGoogle Scholar
- Yakhontova LK, Andreev PI, Ivanova MY, Nesterovich LG, 1987 Bacterial decomposition of smectite minerals Doklady Akademii Nauk SSSR 296: 203–206Google Scholar