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Kodama, Toshiaki,Nishimura, Toshiyasu 한국부식방식학회 2002 Corrosion Science and Technology Vol.31 No.2
Low-alloy weathering show poor performance in environments where airborne salinity is high. Recent research on rust and weathering steels has been focused on the rusting mechanism in the presence of chloride and the development of new steels that are resistant in marinelcoastal environments. The paper focuses on 1) crystal structure of iron rust in high salinity, 2) electrochemical reaction of rust and its catalytic properties in chloride media, 3) protective nature of rust of weathering steels, 4) thermochemical aspect of nrsting in chloride environments,.
Ion Selective Permeability of Rust Layers on Low Alloy Steels under the Chloride Ion Existence
Noda, Kazuhiko,Nishimura, Toshiyasu,Masuda, Hiroyuki,Kodama, Toshiaki 한국부식방식학회 2002 Corrosion Science and Technology Vol.31 No.1
The ion selective permeability of the rust on carbon steel and Fe-Co and Fe-Ni low alloy steel was investigated by measurement of membrane potential to evaluate the characteristics of the rust layer on low alloy steels. These steels were selected as testing materials because they were thought to be basic alloys of weathering steels for the use in coastal environments, A rust film was formed on two kinds of low alloy steels (Fe-Co and Fe-Ni steel) by corrosion cycle tests that imitated the atmospheric corrosion environment in the seashore. In the case of the carbon steel, the rust layer on it had anion selective permeability. On the other hand, in spite of the rust layer on the carbon steel was anion selective, it was found out that the permeability changed to the cation selective by the result of determining the membrane potential of the rust on Fe -Co low alloy steel. The addition of a few Co was effective for decreasing the corrosion rate, because the rust layer of the cation selective was obstructed the invasion of chloride. The addition of Ni was known to be effective in decreasing corrosion rate of steel, despite their anion selective nature in rust layer. Alternative mechanism other than ion selectivity is required for the explanation of inhibition by Ni. The tendency of the membrane potential measurement of rust layers on all samples formed by corrosion cycle test was same as the case of rust films formed by exposure tests.
Genetic association of swine leukocyte antigen class II haplotypes and body weight in Microminipigs
Tatsuya Matsubara,Masaki Takasu,Noriaki Imaeda,Naohito Nishii,Satoshi Takashima,Takashi Nishimura,Toshiaki Nishimura,Takashi Shiina,Asako Ando,Hitoshi Kitagawa 아세아·태평양축산학회 2018 Animal Bioscience Vol.31 No.2
Objective: Microminipigs are a novel animal model with extensive applications in laboratory studies owing, in part, to their extremely small body sizes. In this study, the relationship between swine leukocyte antigen (SLA) class II haplotype and body weight was evaluated in the Microminipig population. Methods: A total of 1,900 haplotypes, covering SLA class II haplotypes Lr-0.7, Lr-0.23, Lr-0.17, Lr-0.37, Lr-0.16, Lr-0.11, Lr-0.13, and Lr-0.18, were analyzed in 950 piglets. Birth weights and weights on postnatal day 50 were examined in piglets with eight different SLA class II haplotypes. Results: The mean birth weight of piglets with the Lr-0.23 haplotype (0.415 kg, n = 702) was significantly lower than that of piglets with Lr-0.17 (0.445 kg, n = 328) and Lr-0.37 (0.438 kg, n = 383) haplotypes. At postnatal day 50, the mean body weight of piglets with the Lr-0.23 haplotype (3.14 kg) was significantly lower than that of piglets with the Lr-0.13 haplotype (3.46 kg, p<0.01). There were no significant differences in daily gains (DGs) among the eight haplotypes. However, piglets with the Lr-0.11 and -0.18 haplotype combination or any heterozygous haplotype combinations containing Lr-0.23 had significantly lower DGs than those of piglets with the Lr-0.18, 0.37 haplotype combination. Conclusion: Piglets with the Lr-0.23 haplotype had relatively low body weights at birth and on postnatal day 50 and slightly lower DGs than those of piglets with other haplotypes. Therefore, the Lr-0.23 SLA class II haplotype may be a suitable marker for the selective breeding of Microminipigs with small body sizes.