Abstract:

In this paper, we have studied the content of the capsular polysaccharides of Bacillus mucilaginosus KO1 and the capability of the bacterial potassiumreleasing from Kfeldspar and biotite in the medium containing nitrogen or free of nitrogenThe results show that though the strain is growing slower in the nitrogenfree medium than in the nitrogencontaining medium, the content of capsular polysaccharides produced by the strain in the nitrogenfree medium is higher than those in the nitrogencontaining mediumThe capsular polysaccharides produced by the strain in the culture which contains different mineral powders will reach the highest content on the third or the fourth day in its growing periodThe strains capability of releasing potassium from kfeldspar and biotite in the nitrogencontaining medium is higher than that in the nitrogenfree medium because in the nitrogenfree medium, the strain and its production of glucoprotein are less than those in the nitrogencontaining mediumWe propose that the protein secreted by the bacterial may play an important role in the process of potassiumreleasing from potassiumbearing minerals

Key words:

Bacillus mucilaginosus; polysaccharides; potassiumreleasing; extracellular secretion