PRODUCTION OF ANTIMICROBIAL AGENTS FROM SOME BACILLUS ISOLATES

Document Type : Research articles.

Authors

Agricultural Microbiology Department, Faculty of Agriculture, Fayoum University.

Abstract

A survey was undertaken for bacterial isolates capable of producing
antimicrobial agents from different Egyptian soils .These isolates were tested
against various species of microorganisms (G+, G-, spore formers , yeast and
fungi) using inhibition zone determination technique and standard disks of
antibiotics as reference.
One or more of the pathogenic bacterial strains used as tested organisms
were affected by antimicrobial substances produced by bacterial isolates as
indicated by inhibition zones formation .The effect of antimicrobial substances
produced by bacterial isolates were compared with the effect of 11 antibiotic
disks as reference. The most effective isolates against the tested organisms were
identified by API 50 CHB system which indicate that these isolates were
Bacillus licheniformis, Bacillus amyloliquefaciens, and Bacillus subtilis.
Whole sediment produced by the five bacterial strains were found to be safe
when using as ration for albino rats.


Keywords

Main Subjects