Computer Science
Scientific paper
Jan 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001adspr..28..549t&link_type=abstract
Advances in Space Research, Volume 28, Issue 4, p. 549-553.
Computer Science
Scientific paper
We reported previously that emerged amoebae of Dictyosterium (D.) discoideum grew, aggregated and differentiated to fruiting bodies with normal morphology in space. Here, we investigated the effects of space radiation and/or microgravity on the number, viability, kinetics of germination, growth rate and mutation frequency of spores formed in space in a radiation-sensitive strain, γs13, and the parental strain, NC4. In γs13, there were hardly spores in the fruiting bodies formed in space. In NC4, we found a decrease in the number of spores, a delay in germination of the spores and delayed start of cell growth of the spores formed in space when compared to the ground control. However, the mutation frequency of the NC4 spores formed in space was similar to that of the ground control. We conclude that the depression of spore formation might be induced by microgravity and/or space radiation through the depression of some stage(s) of DNA repair during cell differentiation in the slime mold.
Amano Takanobu
Masukawa M.
Nagaoka Satoshi
Nakano Takanori
Ohnishi Katsuhiko
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