PURIFICATION AND ANALYSIS OF EXOPOLYSACCHARIDES FROM Alcaligenes faecalis AND ITS MUTANTS ATTACHMENT OF ASSOCIATIVE DIAZOTROPH Alcaligenes faecalis TO RICE ROOTS Colonization of Alcaligenes faecalis on the rice roots under the salt stress Antibacterial Effect of the Total Extract of Hypericum perforatum L. on Corynebacterium glutamicum and Alcaligenes faecalis