Kenneth W Thomulka

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Vibrio harveyi, a bioluminescent marine bacterium, was used to evaluate combined or mixture toxicity of two organic compounds, nitrobenzene and trinitrobenzene. An estimated median effective concentration (EC50) and confidence interval were determined for each chemical. These chemicals at their EC50 were evaluated in combination and an additive index method(More)
Data were collected and analysed on airborne concentrations of asbestos generated by abatement of different asbestos-containing materials using various removal practices. Airborne concentrations of asbestos are dramatically variable among the types of asbestos-containing material being abated. Abatement practices evaluated in this study were removal of(More)
Expression of the purE operon of Salmonella typhimurium was analyzed by using an Escherichia coli F' episome containing a purE-lac fusion. The fusion removes the lacOP and part of the lacZ genes of the lac operon and places the intact lacY and lacA genes under control of the purE operon as shown by inhibition of growth on melibiose (lacY) and repression of(More)
Amphotericin B and other polyene antibiotics have been shown to be useful agents for the isolation of auxotrophic mutants of yeast by virtue of their ability to selectively eliminate large numbers of wild-type cells from mixed populations (A. G. Moat, I. J. Barnes, and E. H. McCurley, J. Bacteriol. 92:297, 1966; A. G. Moat, N. Peters, and A. M. Srb, J.(More)