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Volume 17, Issue 1
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[in Japanese]1971 Volume 17 Issue 1 Pages 1-7
Published: February 28, 1971
Released on J-STAGE: May 30, 2008
JOURNAL FREE ACCESSDownload PDF (929K) -
[in Japanese]1971 Volume 17 Issue 1 Pages 8-18
Published: February 28, 1971
Released on J-STAGE: May 30, 2008
JOURNAL FREE ACCESSDownload PDF (1483K) -
SABURO KANNO, SYOZO FUKUI, MIKIHIRO KANEKO, SYOJI NAITO, SETSUKO SETSU ...1971 Volume 17 Issue 1 Pages 19-23
Published: February 28, 1971
Released on J-STAGE: May 30, 2008
JOURNAL FREE ACCESSPresence of mercury interferes in the spectrophotometric determination of cadmium by the dithizone method. For the elimination of mercury, the acid-digested sample solution was extracted with the chloroform solution of dithizone before neutralization. By this procedure, mercury was removed from the aqueous layer without loss of cadmium. It is usually described in the literature that cadmium is extracted repeatedly with the chloroform solution of dithizone until organic layer becomes colorless, but the organic layer was colored even after repeating extraction more than five times and the decolorization of the organic layer was not a satisfactory index of the end-point of extraction. From the present experiment, three extractions were sufficient for complete extraction of cadmium.View full abstractDownload PDF (639K) -
SABURO KANNO, SYOZO FUKUI, SETSUKO SETSUDA, SYOJI NAITO, MIKIHIRO KANE ...1971 Volume 17 Issue 1 Pages 24-27
Published: February 28, 1971
Released on J-STAGE: May 30, 2008
JOURNAL FREE ACCESSIn the atomic absorption spectroscopic determination of cadmium, ammonium pyrrolidyldithiocarbamate (APDC) was used as the chelating reagent but it was found that sodium diethyldithiocarbamate (DDTC) was better than APDC. Cadmium pyrrolidyldithiocarbamate was slightly soluble in most organic solvents and fairly soluble only in methyl isobutyl ketone, but cadmium diethyldithiocarbamate was easily soluble in most organic solvents. Therefore, extraction efficiency of cadmium complex from the aqueous solution with methyl isobutyl ketone was very good in the case of cadmium diethyldithiocarbamate. This experimental fact resulted in the simplified procedure and high recovery ratio.View full abstractDownload PDF (488K) -
SHUNJI ISHIKURA, MASANORI YONAHA1971 Volume 17 Issue 1 Pages 28-32
Published: February 28, 1971
Released on J-STAGE: May 30, 2008
JOURNAL FREE ACCESSRat and human erythrocytes cholinesterase and purified bovine erythrocytes cholinesterase were used as an enzyme and the effect of phenylmercuric acetate and ethylmercuric phosphate on these enzymes was studied. The enzymic activities were examined by the determination of the amount of unreacted acetylcholine by the method of hestrin. Both organic mercury compounds inhibited these enzymes and the inhibition was expelled by the addition of cysteine. It was proved that PMA inhibited bovine erythrocytes cholinesterase competitively and that EMP inhibited it non-competitively.View full abstractDownload PDF (543K) -
SHUNJI ISHIKURA, NORIKO INOUE, MASANORI YONAHA1971 Volume 17 Issue 1 Pages 33-37
Published: February 28, 1971
Released on J-STAGE: May 30, 2008
JOURNAL FREE ACCESSDiet mixed with different organic mercury compounds was fed continuously to dd strain male mice and mercury content in organs was estimated photometrically by the dithizone method after wet digestion of samples with nitric and sulfuric acids. Significant difference was observed in growth curves of mice given MEMC in doses of 1250 and 2500μg Hg/day from that of the control, and specific neural symptoms were observed in almost all the animals. In the case of MEMC, mercury content in the organs was the highest in the liver, followed by the kidney, spleen, and brain, in the decreasing order. Accumulation of mercury in the liver increased with an increasing dose, but no variation in the amount of accumulated mercury was observed in the kidney. In the case of BMC, accumulation of mercury in the brain was higher than that of MEMC.View full abstractDownload PDF (699K) -
MAMORU SUGIURA, TARO OGISO, YOSHINORI TOKUYAMA, SUZUYO AMANO, SHUKO YO ...1971 Volume 17 Issue 1 Pages 38-44
Published: February 28, 1971
Released on J-STAGE: May 30, 2008
JOURNAL FREE ACCESSDetergents containing proteinase developed in Europe and U. S. A. are produced and used in Japan, but the advantage of such an agent seems to be questionable or negative in this country. Therefore, effectiveness of the agent and stability of the enzyme in the detergent solution were examined. Alkaline proteinase from Bacillus subtilis used in the detergent was more stable than other proteinases such as Molsin, Semialkaline proteinase, Trypsin, or Bromelain towards detergents, tripolyphosphate, and heat (40-50°). Activity of this alkaline proteinase was enhanced with 0.05-0.1% sodium salt of higher alkyl sulfate and 0.15-0.3% anionic detergents solution. Washing effect of detergents containing proteinase towards protein-soiled cloth was markedly accelerated by the combination of anionic or nonionic surfactant and proteinase. This combination had better effect than either the enzyme or the detergent alone. The cleansing action of proteolytic detergents at a low temperature (18°) decreased to one-half of that at 37°. Detergents containing proteinase had poor action on protein-soiled cloths added with rape-seed oil and starch.View full abstractDownload PDF (875K)
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