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  • Author or Editor: R. Matsumoto x
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Abstract  

Time series of the distribution of bio-trace elements in the upper abdomen of living rats were examined using the in vivo multitracer analysis technique. The in vivo dynamics of the elements were estimated by comparison with the distribution of 74As. Vanadium, Mn, Fe, Co, Zn, Se, and Rb were distributed in tissues of the upper abdomen, i.e., mainly in the liver. Be, Sr, and Y might be in the blood or bone at a low level and in the excretion stage already. Dynamics of bio-trace elements were noninvasively obtained in a living rat within one hour after administration.

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Abstract  

Eighteen trace elements, including seven rare earth elements (REEs), and major and minor elements in the sediment samples from the Japan Sea and the northwestern Pacific near Japan were determined with instrumental neutron activation analysis (INAA). Most REE patterns (chondrite-nomalized) of the sediments were nearly identical to the patterns of terrigenous materials without cerium anomaly whereas the La/Yb ratio varied with the site locations. The variation of the La/Yb ratio of the sediments may indicate the regional variation of the mixing proportion of the terrigenous materials from the continent to the materials from the volcanic island arcs including the Japanese islands. The Th/Sc ratio of the sediments tended to increase with distance from the island-arc volcanism. Regional variation of the Th/Sc ratio may indicate variation of amount of the continental terrigenous materials supplied to the sediments.

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Abstract  

Affinity of several bio-trace elements to various reconstructed lipid membranes (liposomes) was assessed using multitracer analysis technique (MTAT). To estimate affinity of bio-trace elements to the sub-cellular components such as lipid membranes, MTAT was applied to the various reconstructed liposomes. Phosphatidylcholine and sphingomyelin liposomes showed a similar pattern of elemental affinity. Phosphatidylserine, phosphatidylglycerol, and phosphatidylinositol liposomes showed another similar pattern of elemental affinity, except that phosphatidylinositol liposome has no affinity to vanadium.

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