Naoyuki Koike

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Mutagenicity of five benzene metabolites was examined by a fluctuation test modified by Gatehouse. The test was performed by using Salmonella typhimurium TA100 with or without a metabolic activation system. Catechol showed mutagenic activity with and without a metabolic activation system in the fluctuation test. Hydroxyhydroquinone, phenol, hydroquinone and(More)
Mutagenicity of nine epoxy resin hardeners was examined by a fluctuation test modified by Gatehouse. The test was performed by using Salmonella typhimurium TA98 with a metabolic activation system. In our laboratory, the results of the fluctuation test were compared with the results obtained by the previously mentioned Ames preincubation method. Six out of(More)
In this paper, we investigate the mean curvature flows having an equifocal submanifold in a symmetric space of compact type and its focal submanifolds as initial data. The investigation is performed by investigating the lifts of the submanifolds and the flows to an (infinite dimensional separable) Hilbert space through a Riemannian submersion of the Hilbert(More)
In a symmetric space of non-compact type, the notion of a complex equifocal submanifold (with flat section) is defined. It is conjectured that this notion coincides with the notion of an isoparametric submanifold with flat section. As a subclass of a complex equifocal submanifold, the notion of a proper complex equifocal submanifold is defined. In this(More)
In this paper, we first investigate the geometry of the orbits of the isotropy action of a semi-simple pseudo-Riemannian symmetric space by investigating the complexified action. Next we investigate the geometry of the orbits of a Hermann type action on a semi-simple pseudo-Riemannian symmetric space. By considering two special Hermann type actions on a(More)
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