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Urushibara, Ayumi*; Kodama, Seiji*; Yokoya, Akinari
Mutation Research; Genetic Toxicology And Environmental Mutagenesis, 766, p.29 - 34, 2014/05
Times Cited Count:10 Percentile:37.18(Biotechnology & Applied Microbiology)Belik, A. A.*; Iikubo, Satoshi; Kodama, Katsuaki; Igawa, Naoki; Shamoto, Shinichi; Niitaka, Seiji*; Azuma, Masaki*; Shimakawa, Yuichi*; Takano, Mikio*; Izumi, Fujio*; et al.
Chemistry of Materials, 18(3), p.798 - 803, 2006/02
Times Cited Count:272 Percentile:98.63(Chemistry, Physical)The crystal and magnetic structures of polycrystalline BiCoO have been determined by the Rietveldmethod from neutron diffraction data measured at temperatures from 5 to 520 K. BiCoO (space groupP4mm; Z=1; a=3.72937(7) and c=4.72382(15) at room temperature; tetragonality c/a=1.267) is isotypic with BaTiO and PbTiO in the whole temperature range. BiCoO is an insulator with a Neeltemperature of 470 K. A possible model for antiferromagnetic order is proposed with a propagationvector of k=(1/2, 1/2, 0). In this model, magnetic moments of Co ions are parallel to the c directionand align antiferromagnetically in the ab plane. The antiferromagnetic ab layers stack ferromagneticallyalong the c axis, forming a C-type antiferromagnetic structure. Refined magnetic moments at 5 and 300K are 3.24(2) and 2.93(2), respectively. The structure refinements revealed no deviation fromstoichiometry in BiCoO. BiCoO decomposed in air above 720 K to give CoO and sillenite-like BiCoO.
Urushibara, Ayumi; Kodama, Seiji*
no journal, ,
Ultraviolet (UV) radiation is one of the risk factors for skin cancer. However, UV, unlike ionizing radiation, is considered not to induce genomic instability. UV generates mainly base damage but not DNA double strand breaks (DSBs), the latter of which is thought to be strongly relevant to genomic instability. To find out whether genomic instability is induced by oxidative base damages, we transferred an UVA irradiated human chromosome 21 into unirradiated mouse cells using a microcell-mediated chromosome transfer method, and looked at the stability of the introduced human chromosome by Whole Chromosome Fluorescence in situ Hybridization (WCP-FISH). In cells that an UVA-irradiated chromosome was transferred, we found that the chromosome number changed remarkably (generating a polyploid), and that the aberration frequency was high for the unirradiated mouse chromosome as well as for the UV-irradiated chromosome. These results suggest that the UVA irradiated chromosomes induce genomic instability in unirradiated cells.
Urushibara, Ayumi; Kodama, Seiji*; Yokoya, Akinari
no journal, ,
no abstracts in English
Urushibara, Ayumi; Kodama, Seiji*
no journal, ,
Urushibara, Ayumi; Kodama, Seiji*; Yokoya, Akinari
no journal, ,
no abstracts in English
Urushibara, Ayumi; Kodama, Seiji*; Yokoya, Akinari
no journal, ,
Urushibara, Ayumi; Kodama, Seiji*
no journal, ,
Urushibara, Ayumi; Kodama, Seiji*; Yokoya, Akinari
no journal, ,
no abstracts in English