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Optimizing the culture conditions and determining the stability of antibiotic secretion by Polygonum viviparum of the endophytic bacteria Bacillus mojavensis Fermentation of Bacillus subtilis ge25 strain and preliminary study on its antagonistic substances Screening, Identification and Fermentation Conditions Optimization of Antagonistic Strain 6-59 of Bacillus megaterium against Ceratosphaeria phyllostachydis The isolation and characteristics of antifungal substances produced by Bacillus pumilus strain BSH-4 Isolation, purification and structure analysis of the antagonistic substance produced by Bacillus subtilis SN-02