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The Efficacy of Bacterial SWITCH Test for Determination of Cyto- and Genotoxicity Induced by X-Rays and Simulated Space Radiation Qualities

Paudel, Suresh (2011) The Efficacy of Bacterial SWITCH Test for Determination of Cyto- and Genotoxicity Induced by X-Rays and Simulated Space Radiation Qualities. Master's, University of Applied Science Bonn-Rhein-Sieg.

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Abstract

The principal concerns for astronauts exposure to space radiation is the cancer. Astronauts are exposed to different quality of radiation in space than they receive in earth. In this study, the recombinant SWITCH test, developed by bio-diagnostics group at German Aerospace Center (DLR) was used to analyze bacterial inactivation and mutation induction by ionizing radiation in parallel to different chemicals in the same cell within short time. On the other hand, Chemical dosimetry was also performed for the determination oxidative damage from different qualities of radiations of 200 kV X-rays. The results obtained from chemical dosimetry clearly show that no difference between physical and chemical dosimetry as indicated by similar oxidative damage. Likewise the results obtained from SWITCH test treated with chemicals (Bleomycin and hydrogen peroxide), different quality of 200 kV X- rays and heavy ions (75 MeV/u carbon with LET 37 keV/μm and 95 MeV/u oxygen with LET 52 keV/μm) show that the bacterial strain pSWITCH Salmonella typhimurium TA1535 shows greater sensitiveness towards tested chemical and ionizing radiation than pSWITCH Escherichia coli C600. The inactivation of bacteria (cytotoxicity) by number of hits (Particles per cm-²) depends on LET and genotoxic response seems to be inversely related to LET.

Document Type:Thesis (Master's)
Title:The Efficacy of Bacterial SWITCH Test for Determination of Cyto- and Genotoxicity Induced by X-Rays and Simulated Space Radiation Qualities
Authors:
AuthorsInstitution or Email of Authors
Paudel, Suresh UNSPECIFIED
Date:2011
Journal or Publication Title:MSc Thesis
Number of Pages:80
Status:Published
Keywords:Recombinant bacteria, SWITCH Test, Bioluminenescence, Green Fluorescence protein, Astronauts risks, Space radiation
Institution:University of Applied Science Bonn-Rhein-Sieg
Department:Department of Natural Sciences
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Research under Space Conditions
DLR - Research area:Raumfahrt
DLR - Program:R FR - Forschung unter Weltraumbedingungen
DLR - Research theme (Project):R - Vorhaben Strahlenbiologie
Location: Köln-Porz
Institutes and Institutions:Institute of Aerospace Medicine > Radiation Biology
Deposited By: Kerstin Kopp
Deposited On:04 Nov 2011 11:17
Last Modified:04 Nov 2011 11:17

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