Growth of Selected Bacteria in Liquid Media Containing DDT, Dieldrin and Heptachlor

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Abstract
Growth of Pseudomonas fluorescens and Staphylococcus aureus in trypticase soy broth was affected by DDT exceeding 50 t~g per milliliter. This effect was more pronounced after the first day of incubation. No effect on growth was observed in skimmilk containing up to 100 ~g per milliliter of DDT. Concentrstion of 3 t~g per milliliter of heptachlor in trypticase soy broth inhibited the growth of S. aureus up to 18 hours, whereas 15 to 20 tog per milliliter prevented growth up to 7 days. Inhibition of S. aurcus was not observed in skimmilk or in trypticase soy broth plus 3% whole casein or mixture of a-and fl-casein fraction containing up to 100 tLg per milliliter of heptachlor. Heptachlor epoxide had no inhibitory effect, whereas 72% heptachlor was more inhibitory than 99% heptachlor.

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