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Volume 6, Issue 2
Displaying 1-4 of 4 articles from this issue
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Teiji UKAI, Eiichi HAYASHI, Shigeko SAITO, Shozo TAKAMURA, Sumiko INOH ...1965 Volume 6 Issue 2 Pages 55-63
Published: 1965
Released on J-STAGE: August 29, 2006
JOURNAL FREE ACCESSThe effect of green tea and related compounds against Sr-90 absorption through the intestine was examined by using Wistar strain rats. It was concluded that green tea acts inhibitorily on the absorption of Sr-90 through the intestine and that the effect is partly due to the astringent action and the reduction of the intestinal movement by green tea.View full abstractDownload PDF (353K) -
Ugoro KOBAYASHI, Hideho SASAKI1965 Volume 6 Issue 2 Pages 64-72
Published: 1965
Released on J-STAGE: August 29, 2006
JOURNAL FREE ACCESSFallout radioactivity due to a leakage of the underground nuclear explosion test of U. S. S. R. (Jan. 15, 1965) was investigated. Abnormal increase of radioactive fallout was observed at first on the early morning of Jan. 20 at Nagaoka, Niigata Pref. In the fallout after Feb. 10, the influence by short lived nuclides could not be found.
Gamma-ray spectrum of rain-snow sample of Jan. 20 coincided well with that of 140Ba + 140La, and the counting rate of gamma-rays decayed to a half in every 13 days through the beginning of March. Most part of gamma-activity was considered to be attributed to 140Ba + 140La in the transient equilibrium state.
Radioactive product, 140Ba, was used as a checking source and 140Ba + 140La content in each fallout sample collected after Jan. 20 was estimated. After subtraction 140Ba + 140La activity from the total activity in each sample, the residual decayed almost exponentially, with a half-life of 51 ?? 53 days, extending for a fairly long period of time. Maximum beta-ray energy was estimated to be 1.5-1.6 MeV at the end of March when 140Ba + 140La was considered practically to have been extinct. Thus a chief component of the residual was thought to be 89Sr.
Cumulative deposition of 140Ba + 140La and other nuclides during the period from Jan. 19 to Feb. 9 was estimated to be about 110 mCi/km2 and 270 mCi/km2 respectively as values of Feb. 15.View full abstractDownload PDF (340K) -
Takeshi IINUMA, Teruo NAGAI, Tomio ISHIHARA, Kazuo WATARI, Masami IZAW ...1965 Volume 6 Issue 2 Pages 73-81
Published: 1965
Released on J-STAGE: August 29, 2006
JOURNAL FREE ACCESSFour Japanese subjects (three males and a female) were measured for their whole body retention and excretion rate following oral administration of 132Cs. For the retention and distribution studies, awhole body counter-scanner that was built at this institute was used. In this first report, short and long-term biological half-lives, daily urinary and fecal excretion rates and the calibration constants for 137Cs in the body are reported. Although the excretion patterns obtained were quite similar to those already reported by others, the mean long-term biological halflife for the three male subjects, (73 days ranging from 65.5 to 82.0 days) was rather smaller than other values. The short-term half-life is caused by a large excretion rate in urine in a few days following the administration.View full abstractDownload PDF (331K) -
Iwao KANNO, Kazue FUKUSHI, Junji YAMAGUCHI, Keiji UTAGAWA, Eiju UMEHAR ...1965 Volume 6 Issue 2 Pages 82-95
Published: 1965
Released on J-STAGE: August 29, 2006
JOURNAL FREE ACCESSObservations were made from various points on the effect of single X-ray irradiation at 100 to 1, 000 R on HeLa cells : 1) The metabolism was disturbed in HeLa cells in culture in test tubes by X-irradiation at more than 300R. With over 300R, the proliferation of the number of cell nuclei was restrained. This effect was especially pronounced with irradiation by 1, 000R. 2) Examination by Giemsa staining revealed only the disturbance in mitotic cells in X-irradiation at less than 200R, but the disturbance in the resting cells was pronounced in X-irradiation at over 500R. 3) Histochemical observation by means of Feulgen reaction revealed that more than 20% of the stickiness of chromosome was produced in 3 to 7 days after X-irradiation by 500 to 1, 000 R. 4) Observation of electron-microscopic pictures revealed that the cytoplasma of HeLa cells grew larger with the increase of the amount of X-irradiation and that round degenerations were present locally. Both cytoplasma and nucleoplasma became scarce. No remarkable changes were observed in mitochondria, endoplasmic reticulum and nucleolus. The double structure of the nuclear membrane remained undisturbed. 5) The inhibitions of about 18% in the respiratory action and 29% in glycolysis were observed 24 hours after X-irradiation at 1, 000 R. 6) There was hardly any change in the amount of nucleic acid (both RNA-P and DNA-P) 15 hours after X-irradiation at 1, 000 R, but the incorporation of 32P into nucleic acid-P was clearly inhibited. Also about 50% inhibition of the mononucleotide of the RNA was observed. No remarkable difference in incorporation was observed among the mononucleotides in the groups.View full abstractDownload PDF (811K)
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