Influence of silicate substrate on growth and production of macrocapsules of certain strains of Bacillus circulans
2006
Nastasijevic, B.(University of Belgrade, Belgrade (Serbia). Faculty of Chemistry)
In presence of silicate substrate which is added in the basic medium, bacteria which belong to the species of Bacillus circulans forming slime capsules around bacterial cell, e.g. exopolysaccharides (in further text EPS). In this study three different media are used and in every of it, the source of Si has been added, e.g. sand or silicon oil. The growth of three strains of bacteria Bacillus circulans have compared: Jordan, 215 and 4E. Influence of two different sources of Si on bacterial growth and on accumulation of EPS was investigated. Before fermentation in liquid media all strains were adjusted to the same medium on agar plate. Finally, after fermentation the quantity of produced EPS has been evaluated. From collected data one can note that the highest yield of exopolysaccharides was obtained from strain Jordan, when cultivated on medium (No 2) in the presence of sand, as a source of Si.
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