title: [The effect of a soil extract on the development of Bacillus thuringiensis and on its synthesis of an insecticidal endotoxin].
abstract: Selection of effective and inexpensive nutrient medium for cultivation of entomopathogenic bacteria Bacillus thuringiensis was carried out. The medium with molasses [correction of patoka], corn extract and mineral salts has been chosen. Addition of a soil extract to the medium enhanced growth of microorganisms, increased the rate of culture development, the yield of spore-crystalline material and quantity of synthesized endotoxin. Apparently the strengthening effect belongs to humic substances contained in the soil extract.
authors.affiliation: Department of Microbiology, Dniepropetrovsk State University, Ukraine.
authors.forename: O A
authors.initials: OA
authors.lastname: Dregval'
authors.forename: N V
authors.initials: NV
authors.lastname: Cherevach
authors.forename: O E
authors.initials: OE
authors.lastname: Andrienko
authors.forename: A I
authors.initials: AI
authors.lastname: Vinnikov
mesh_terms: D000818:Animals; D001413:Bacillus thuringiensis / Q000254:growth & development* / Q000302:isolation & purification / Q000378:metabolism; D003470:Culture Media; D004731:Endotoxins / Q000096:biosynthesis*; D007313:Insecta / Q000382:microbiology; D007306:Insecticides; D012987:Soil
chemical_list: D003470:Culture Media; D004731:Endotoxins; D007306:Insecticides; D012987:Soil