An oxygen effect in dry bacterial spores and its temperature dependence |
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| Authors: | POWERS E L WEBB R B EHRET C F |
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| Affiliation: | 1. National Center for Radiation Research and Technology (NCRRT), Atomic Energy Authority (AEA), P.O. Box 8029, Nasr City, Cairo 11787, Egypt;2. ESRF-The European Synchrotron, ID17 Biomedical beamline, 71 Avenue des Martyrs, 38000 Grenoble, France;3. UA7 STROBE Inserm, Grenoble Alpes University, Grenoble, France;4. Swansea University Medical School, Singleton Park, Swansea SA2 8PP, United Kingdom;1. STERIS, IDA Business & Technology Park, Tullamore, R35 X865, Ireland;2. STERIS, Roydsdale Way, Euroway Trading Estate, Bradford, W. Yorkshire, BD4 6SE, UK;3. STERIS, Hogenweidstrasse 6, 4658, Däniken, Switzerland;4. Bioscience Research Institute, Technological University of the Shannon Midlands Midwest, Athlone Campus, Ireland;1. Tokyo Metropolitan Industrial Technology Research Institute, 2-4-10, Aomi, Koutou-ku, Tokyo, 135-0064, Japan;2. Faculty of Biology, Dalat University, 01 Phu Dong Thien Vuong, Dist, Da Lat, Lam Dong, Viet Nam;3. Center for Fungal Consultation, 13-1 Yukigayaotsuka-cho, Ota-ku, Tokyo, 145-0067, Japan;4. Department of Quantum and Radiation Engineering, Graduate School of Engineering, Osaka Metropolitan University, 1-2 Gakuen-cho, Naka-ku, Sakai, Osaka, 599-8570, Japan;5. Osaka Metropolitan University College of Technology, 26-12 Saiwai-cho, Neyagaw City, Osaka, Japan;6. Kobe University, 1-1, Rokkodai-cho, Nada-ku, Kobe, 657-8501, Japan |
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| Abstract: | The sensitivity of dry spores of Bacillus megaterium to X-rays is higher in the presence of oxygen than it is in helium or in nitrogen. The sensitivity in oxygen (air) relative to that in helium is temperature dependent, being 1.00 at 125 °K (−148 °C) and below, rising gradually to 1.25 at about 310 °K (37 °C), and then rising steeply to 2.25 at 355 °K (82 °C). The final sharp rise is due to the almost complete disappearance in oxygen of the marked inversion in radiation sensitivity observed in this system between these temperatures under anoxic conditions. |
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