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Algicidal bacteria offer a promising option for killing cyanobacteria. Therefore, a new  Alcaligenes aquatilis  strain F8 was isolated to control  Microcystis aeruginosa  in this study. The algicidal activity of strain F8 was dependent on the cell density of  M .  aeruginosa , and the maximal algicidal rate of the free bacterium reached 88.45% within 72 h. With a view to its application to the control of  M .  aeruginosa  in the natural environment, strain F8 was immobilized in sodium alginate beads, but immobilization of the strain decreased its algicidal rate compared to that of the free bacterium. However, addition of wheat bran to the sodium alginate matrix used to immobilize strain F8 not only eliminated the adverse effects of immobilization on the bacteria but also resulted in an 8.83% higher algicidal rate of the immobilized than free bacteria. Exclusion and recovery methods were used to identify key ingredients of wheat bran and gain insight into the mechanism underlying the observed enhancement of algicidal activity. This analysis indicated that certain factors in wheat bran, including vitamins B 1 , B 2 , B 9 , and E were responsible for promoting bacterial growth and thereby improving the algicidal rate of immobilized strain F8. Our findings indicate that wheat bran is able to improve the algicidal efficiency of  A .  aquatilis  strain F8 for killing  M .  aeruginosa  and is a good source of not only carbon and nitrogen but also vitamins for bacteria.

Wheat Bran Enhances the Cytotoxicity of Immobilized Alcaligenes aquatilis F8 against Microcystis aeruginosa