Record Display for the EPA National Library Catalog


OLS Field Name OLS Field Data
Main Title Fate of 'Bacillus sphaericus' and 'Bacillus thuringiensis' Serovar 'Israelensis' in the Aquatic Environment.
Author Yousten, A. A. ; Genthner, F. J. ; Benfield, E. F. ;
CORP Author Virginia Polytechnic Inst. and State Univ., Blacksburg. Dept. of Biology.;Environmental Research Lab., Gulf Breeze, FL.
Publisher c1992
Year Published 1992
Report Number EPA/600/J-92/382;
Stock Number PB93-121143
Additional Subjects Bacillus thuringiens ; Aquatic microbiology ; Bacterial spores ; Fresh water ; Sea water ; pH ; Temperature ; Salinity ; Reprints ; Bacillus sphaericus
Library Call Number Additional Info Location Last
NTIS  PB93-121143 Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy. 06/08/1993
Collation 8p
Bacillus sphaericus spores were suspended in bottles of filtered (0.45 micrometers) freshwater and seawater under various conditions of temperature, pH and salinity. Heat resistant culturable counts (spores) slowly decreased with time. Spores suspended in dialysis bags submerged in a freshwater pond or in flowing seawater underwent a more rapid drop in heat resistant spore counts than did spores held in bottles. Thus, laboratory studies may overestimate spore longevity in the environment. Spore settling rate was related to the nature of particulate material in the water column. Paraspores (or perhaps spores and toxin) of B. thuringiensis serovar israelensis (B.t.i.) had a greater tendency to adhere to and settle with suspended sediment and fine particulates than did paraspores of B. sphaericus. These observations may at least partially explain the greater persistence of B. sphaericus larvicidal activity in field tests than that of B.t.i.