Radiotolerance of microorganisms isolated from radiation fields on university campus: Implications for shallow subsurface growth of microorganisms on Mars

摘要

The surface of Mars is exposed to higher levels of solar and galactic cosmic rav imirfw * C U , weak magnetic field Thus, microorganisms that could possibly fu "ve "halw suurfa5f "t0 ** U be radiotolerant To better understand microorganisms^ Jght resided^Son^^^^ ls0lates were obtamed from the area around a gamma-radiation source, "7Cs, located on the U JR cam sensitivity assays were performed on the isolates as well as on the common bacterium, R coli M were able to withstand exposures up to 20 Gy, The E. coli control did not survive exposures of 200 Gy whTle Z It deslgnated 1B-1 could. Another isolate, Cont-1, also withstood this exposure Each of the isolates p^utdwhL growth on solid medium and their cells are rod-shaped, The study of these isolates and similar organ smScOuwfh.