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Space programmes are shifting toward planetary exploration and in particular toward missions by human beings to the moon and Mars. However,exposure to space radiation is an important barrier to exploration of the solar system by human beings because of the biological effects of high-energy heavy ions. Furthermore,a condition of weightlessness(termed as microgravity)is experienced by astronauts in space. That is to say,when astronauts are in space,they would suffer both radiation and microgravity. Studies show that radiations can induce cell damage,such as cell death,micronucleus,chromosome aberrations,and so on[1];and microgravity can affect many physiological functions[2]. For analyzing the damage effects on mammalian cell
Space programmes are shifting toward planetary exploration and in particular toward missions by human beings to the moon and Mars. However, exposure to space radiation is an important barrier to exploration of the solar system by human beings because of the biological effects of high-energy heavy ions. Furthermore, a condition of weightlessness (termed as microgravity) is experienced by astronauts in space. That is to say, when astronauts are in space, they would suffer both radiation and microgravity. Studies show that radiations can induce cell damage, such as cell death, micronucleus, chromosome aberrations, and so on [1]; and microgravity can affect many physiological functions [2]. For analyzing the damage effects on mammalian cell