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Induction of error-free DNA repair in Escherichia coli by heat shock and nutritional stress in presence of formaldehyde [electronic resource].

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Zaied, Khalifa A

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Language: English Summary language: Arabic Description: p.263-285Other title:

حث نظام إصلاح الأخطاء فى الحمض النووى الديؤكسى ريبوزى فى بكتريا القولون من خلال تعريض الخلايا للصدمات الحرارية والإجهادات التغذوية فى وجود الفورمالدهيد [Added title page title]

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Egyptian journal of microbiology, 2003 v.37 (3) [electronic resource].

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In: Egyptian Journal of Microbiology 2002.V.37(3)Summary: Heat shock and thiamine deprivation resulting Escherichia coli tolerance to formaldehyde stress depend on error-free DNA repair process. Heat shock and thiamine deprivation cause a simultaneous increase in mutation frequency and induce reversion to prototrophy of different nutritional markers as shown in this study through Ames fluctuation tests. Both non-mutagenic stresses in the presence of formaldehyde have now shown reduction in mutation frequency induced to prototrophy. These effects are due to the higher increase in the genotoxicity of formaldehyde in different E. coli strains. Both E. coli strains, AB1157 and AB1884, exposed to 37·C and 52oc, respectively appeared more resistant to formaldehyde concentrations in preincubation experiments.

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Heat shock and thiamine deprivation resulting Escherichia coli tolerance to formaldehyde stress depend on error-free DNA repair process. Heat shock and thiamine deprivation cause a simultaneous increase in mutation frequency and induce reversion to prototrophy of different nutritional markers as shown in this study through Ames fluctuation tests. Both non-mutagenic stresses in the presence of formaldehyde have now shown reduction in mutation frequency induced to prototrophy. These effects are due to the higher increase in the genotoxicity of formaldehyde in different E. coli strains. Both E. coli strains, AB1157 and AB1884, exposed to 37·C and 52oc, respectively appeared more resistant to formaldehyde concentrations in preincubation experiments.

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