caa a22 4500 465745040 CHVBK 20180323111818.0 cr unu---uuuuu 170327e19900301xx s 000 0 eng 10.1007/BF01808271 doi (NATIONALLICENCE)springer-10.1007/BF01808271 Selective decomposition of either enantiomer or aspartic acid irradiated with60Co-γ-rays in the mixed aqueous solution with D- or L-alanine [Elektronische Daten] [Mitsuhiko Akaboshi, Kenichi Kawai, Hirotoshi Maki, Wilhelm Ehrlich, Yasuhiro Honda] Aqueous solutions of various amino acids were irradiated with60Co-γ-rays, and subsequently the remaining amino acids were analyzed using HPLC. The D37 for the 1 mM glycine and alanine solutions were 1.95×104 and 1.48×104 Gy, respectively. However, when the mixed solutions of glycine and alanine (each in 0.5 mM) were irradiated under the identical condition, the D37 for the glycine decomposition increased to 3.56×104 Gy, while that for alanine decreased to 0.65×104 Gy. A similar phenomenon was observed also in the case of the mixed solutions of aspartic acid and alanine. Namely, aspartic acid was protected from the attack of radiation by the presence of alanine in the solutions. The most interesting finding in this combination experiment is that, when D,L-aspartic acid was irradiated in the presence of L-alanine, the radiation-sensitivity of L-aspartic acid decreased selectively and vice versa. Namely, the asymmetric field induced in the solutions by adding D- or L-alanine might affect the radiodecomposition rate of either aspartic acid. Addition of glycine to D,L-aspartic acid did not bring about the asymmetric decomposition. It seems that some interaction between these amino acid molecules resulted in this effect. Kluwer Academic Publishers, 1990 Akaboshi Mitsuhiko Research Reactor Institute, Kyoto University, 590, Kumatori, Osaka, Japan aut Kawai Kenichi Research Reactor Institute, Kyoto University, 590, Kumatori, Osaka, Japan aut Maki Hirotoshi Research Reactor Institute, Kyoto University, 590, Kumatori, Osaka, Japan aut Ehrlich Wilhelm Research Reactor Institute, Kyoto University, 590, Kumatori, Osaka, Japan aut Honda Yasuhiro Research Reactor Institute, Kyoto University, 590, Kumatori, Osaka, Japan aut Origins of life and evolution of the biosphere Kluwer Academic Publishers 20/2(1990-03-01), 111-119 0169-6149 20:2<111 1990 20 11084 https://doi.org/10.1007/BF01808271 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF01808271 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Akaboshi Mitsuhiko Research Reactor Institute, Kyoto University, 590, Kumatori, Osaka, Japan aut NATIONALLICENCE 700 1- Kawai Kenichi Research Reactor Institute, Kyoto University, 590, Kumatori, Osaka, Japan aut NATIONALLICENCE 700 1- Maki Hirotoshi Research Reactor Institute, Kyoto University, 590, Kumatori, Osaka, Japan aut NATIONALLICENCE 700 1- Ehrlich Wilhelm Research Reactor Institute, Kyoto University, 590, Kumatori, Osaka, Japan aut NATIONALLICENCE 700 1- Honda Yasuhiro Research Reactor Institute, Kyoto University, 590, Kumatori, Osaka, Japan aut NATIONALLICENCE 773 0- Origins of life and evolution of the biosphere Kluwer Academic Publishers 20/2(1990-03-01), 111-119 0169-6149 20:2<111 1990 20 11084 Metadata rights reserved Springer special CC-BY-NC licence nationallicence SWISSBIB 465122019 BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer