Ifratun Nur - Academia.edu (original) (raw)
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Present study attempted to identify and enumerate micro organisms spoiling commonly used cosmetic... more Present study attempted to identify and enumerate micro organisms spoiling commonly used cosmetics samples. Among 20 brands of total 6 categories of samples studied (soap, shampoo, lotion, face wash, cream and petroleum), almost all were found to be rigorously contaminated with total viable bacteria within a range of 10 3 -10 5 cfu/g. Proliferation of fungal species was observed up to 10 3 cfu/g. Prevalence of Staphylococcus sp., Pseudomonas sp. and Bacillus sp. was observed within a range of 10 1 -10 3 cfu/g while actinomycetes were completely absent. Among the enteric bacteria, Escherichia coli was found completely absent from all the samples tested, however, the prevalence of Klebsiella sp. was noted up to 10 1 cfu/g. Such findings highlighted a great public health risk associated with skin diseases among the users and thereby specified the importance to introduce a proper guideline in maintaining good microbiological quality for such topically used healthcare products.
The present study attempted to determine the influence of exogenous oxidative stress on the cell ... more The present study attempted to determine the influence of exogenous oxidative stress on the cell viability of Escherichia coli. In this regard, 3mM hydrogen peroxide (H 2 O 2 ) was added to the late log phase of E. coli culture, and afterwards the phenotype, cell morphology and the ability to form colony forming units (CFU) on agar plates were examined. As expected, a quick phenotypic suppression as well as a rapid decline in viable and culturable cell numbers was observed at the mid-stationary phase as compared to control. Interestingly, a large mass of cell aggregates was noticed upon addition of H 2 O 2 . Thus the current investigation corroborated the previous findings and further added to the existing knowledge on oxidative stress events in E. coli.
Present study attempted to identify and enumerate micro organisms spoiling commonly used cosmetic... more Present study attempted to identify and enumerate micro organisms spoiling commonly used cosmetics samples. Among 20 brands of total 6 categories of samples studied (soap, shampoo, lotion, face wash, cream and petroleum), almost all were found to be rigorously contaminated with total viable bacteria within a range of 10 3 -10 5 cfu/g. Proliferation of fungal species was observed up to 10 3 cfu/g. Prevalence of Staphylococcus sp., Pseudomonas sp. and Bacillus sp. was observed within a range of 10 1 -10 3 cfu/g while actinomycetes were completely absent. Among the enteric bacteria, Escherichia coli was found completely absent from all the samples tested, however, the prevalence of Klebsiella sp. was noted up to 10 1 cfu/g. Such findings highlighted a great public health risk associated with skin diseases among the users and thereby specified the importance to introduce a proper guideline in maintaining good microbiological quality for such topically used healthcare products.
The present study attempted to determine the influence of exogenous oxidative stress on the cell ... more The present study attempted to determine the influence of exogenous oxidative stress on the cell viability of Escherichia coli. In this regard, 3mM hydrogen peroxide (H 2 O 2 ) was added to the late log phase of E. coli culture, and afterwards the phenotype, cell morphology and the ability to form colony forming units (CFU) on agar plates were examined. As expected, a quick phenotypic suppression as well as a rapid decline in viable and culturable cell numbers was observed at the mid-stationary phase as compared to control. Interestingly, a large mass of cell aggregates was noticed upon addition of H 2 O 2 . Thus the current investigation corroborated the previous findings and further added to the existing knowledge on oxidative stress events in E. coli.