Survival curves of bacteria with public health significance irradiated in crabmeat and in Hartsell's broth Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/d791sk66j

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  • Gamma irradiation survival curves of Salmonella enteriditis, Salmonella paratyphi A, Salmonella cholerasuis, Salmonella pullorum and Streptococcus pyogenes were determined in crabmeat and in Hartsell's broth. The survival pattern of Staphylococcus aureus in crabmeat was also determined. A "tailing off" was found in the survival patterns of Salmonella paratyphi A, Salmonella pullorum, Salmonella enteriditis and Staphylococcus aureus when they were irradiated in crabmeat, but was not found when these organisms (excluding Staphylococcus aureus) were irradiated in Hartsell's broth. However, Salmonella cholerasuis and Streptococcus pyogenes showed a definite "tailing off" in the broth while only weakly, if any, in the crabmeat. A comparison was made of the gamma irradiation recovery of Salmonella cholerasuis in crabmeat assayed immediately following irradiation to that assayed after the crabmeat had been held seven days at 4°C. The refrigerated samples showed lower survival. Staphylococcus aureus white mutants were observed at 1.0 Mrad and higher doses. Three mutants were isolated for further investigations. These mutants were stable and gave varied coagulase and hemolytic tests. In an examination of one mutant, no greater resistance to irradiation than parent culture was found.
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