Long-term dosimetry of solar UV radiation in Antarctica with spores of Bacillus subtilis

Article Abstract:

The influence of the seasonal stratospheric ozone depletion on the ultraviolet (UV) climate in Antarctica was studied using Bacillus subtilis spores as a biological test system. The test strain was deficient in DNA repair. The UV-induced loss of colony-forming activity was measured and inactivation constants calculated. The trend of UV-B radiation was found to be season-dependent, and the UV-B levels were biologically harmful and were higher than expected values. The thickness of the ozone column was, therefore, shown to have an influence on the biologically harmful UV-B on the ground.

Bacteria, Ozone layer depletion

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Bacterial spores survive treatment with commercial sterilants and disinfectants

Article Abstract:

Research was conducted to compare the sporicidal activities of commercial liquid sterilants under manufacturer-specified conditions by using a sensitive approach that can quantitatively account for the survival of all spores on contaminated carrier devices. Results obtained with a sensitive and quantitative test indicate that commercial liquid sterilants and disinfectants are less effective on contaminated surfaces than generally acknowledged.

Disinfection and disinfectants, Disinfectants, Disinfection

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Examination of peak power dependence in the UV inactivation of bacterial spores

Article Abstract:

A high-peak-power UV laser and a low-power continuous lamp source can inactivate Bacillus subtilis spores equally well even though they differ in peak power by a factor of 10(super 8). Other researches have reported differences in the sterilization of food when these two sources of UV radiation are used.

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