Yuhi Hiraoka

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Cultured oysters from Hiroshima Bay were analysed to determine the content of nine trace elements, cadmium (Cd), lead (Pb), chromium (Cr), arsenic (As), manganese (Mn), nickel (Ni), copper (Cu), zinc (Zn), and iron (Fe) and compared with oysters treated for 48 h in both artificial sea water and a solution of 0.5% ethylenediaminetetraacetic acid (EDTA) in(More)
Various experiments were conducted to examine the effects of degradation products on organisms. Fenitrothion (MEP) emulsions adjusted to pH 10 or 14 were degraded by exposure to natural sunlight in winter with heat. Medaka eggs were exposed to various concentrations of the degraded solutions and an untreated MEP emulsion for 5 days starting 4-5 h following(More)
It has long known that H2S is sometimes encountered during excavation in the Hiroshima delta. In order to secure information necessary to the improvement of working conditions in this area, we investigated the generation of H2S where work was being done on the Hiroshima sewage system. Using the shield method, we measured the concentration of H2S in the air(More)
We investigated the effects of a diphenyl ether herbicide, a chlornitrophen (CNP) emulsion, on mouse fetuses. An MO emulsion was used as the experimental chemical twenty percent of this herbicide consisting of CNP. CNP and other components were extracted and evaporated (undegraded solution). The chemical was diluted 10 times by deionized water and then(More)
Experiments were carried out on rats in order to find out the implications for psychiatry of the basic biological effects of rubidium (Rb). The forced swimming test (FST), used to evaluate the effects on rats of treatment with Rb, was conducted after 1 or 3 mEq/kg Rb was given chronically or subacutely. The weight of rats treated with 1 or 3 mEq/kg Rb, once(More)
In order to find out the connected items of smoking habit and to consider its countermeasures of smoking, a questionnaire survey was carried out in July 1985 to 1451 1stand 2ndgrade college or university students. The percentages of students who were currently smoking and who smoked in the past were 75.9% of male students and 35.9% of females. 40.1 % of the(More)
Experiments were carried out to examine the effects of degradation products on mice. Fenitrothion (MEP) emulsion, a kind of an organic phosphorous insecticide, adjusted to pH 8, pH 10, and pH 14 were degraded by exposure to natural sunlight. Physiological saline, an untreated MEP emulsion, and the three degraded solutions were prepared as experimental(More)