All issues
Volume 9, Issue 1
Displaying 1-7 of 7 articles from this issue
- |<
- <
- 1
- >
- >|
-
Giichi YOSHII, Masahiro SAITO1968 Volume 9 Issue 1 Pages 1-4
Published: March 01, 1968
Released on J-STAGE: August 29, 2006
JOURNAL FREE ACCESSWhen nucleohistone was irradiated in a aqueous solution, the radicals produced in DNA seemed to be transferred to histone in the absence of Ca ion. By this mechanism DNA may be protected by histone associating with the former. The transfer of radicals from DNA to histone was prevented in the presence of Ca ion.View full abstractDownload PDF (155K) -
Shigetaka SEKIYAMA, Yuko IWAI, Tadashi TAKEUCHI1968 Volume 9 Issue 1 Pages 5-11
Published: March 01, 1968
Released on J-STAGE: August 29, 2006
JOURNAL FREE ACCESSThe present studies were undertaken to investigate the relationship between blood pressure and adrenal medullary cells (norepinephrinecontaining cells) in adult male rats after whole body X-ray irradiation (700 R.).
1. Both systolic and diastolic values of blood pressure elevated at 3, 24 and 48 hours after irradiation, but systolic pressure became lower than the normal level at 0.5 and 72 hours (p<0.01).
2. Pulse rate decreased at 3, 72 and 120 hours after irradiation (p<0.01). Although pulse rate showed tendency to decrease in 24 and 48 hours, it was not statistically significant.
3. Increase in number of norepinephrine-containing cells with marked accumulation of cytoplasmic granules was seen at 3, 12, 24 and 48 hours after irradiation (p<0.01). On the other hand, decrease in number of cytoplasmic granules associated with marked degeneration was observed at 72 and 120 hours.
4. These results indicated the positive correlation between blood pressure and morphological changes of norepinephrine-containing cells.View full abstractDownload PDF (634K) -
Morito CHIBA, Ryushi ICHIKAWA1968 Volume 9 Issue 1 Pages 12-18
Published: March 01, 1968
Released on J-STAGE: August 29, 2006
JOURNAL FREE ACCESSIn view of possible radioactive iodine accumulation by thyroid of breast-fed infant through maternal milk under a certain contaminated environment, the secretion rate of dietary iodine into human milk was estimated by iodine determination for diet and milk. For several hundred μg daily intake level, the secretion rate is around 10 per cent, whereas less than one per cent is found for 10 mg intake level.View full abstractDownload PDF (266K) -
Mitsuoki MORIMYO, Zen-ichiro HORII, Kenshi SUZUKI1968 Volume 9 Issue 1 Pages 19-25
Published: March 01, 1968
Released on J-STAGE: August 29, 2006
JOURNAL FREE ACCESSA Rec- mutant of Escherichia coli K 12 (JC 1569 b) was irradiated with X-rays, lysed gently with lysozyme and centrifuged in alkaline sucrose gradients. The sedimentation profile for DNA demonstrated that X-rays produces low moleuclar weight DNA and that the sedimentation profile altered by irradiation with X-rays cannot be restored after incubation. In contrast, the altered profile for the original Rec+ bacteria was restored almost completely under the same conditions. These results suggested that X-rays yields single-strand breaks in the DNA of Rec- and of Rec+ bacteria and that the break in the DNA of Rec+ bacteria can be repaired but not the break in Rec- bacteria.View full abstractDownload PDF (280K) -
Yoshikazu ENOMOTO, Ryushi ICHIKAWA1968 Volume 9 Issue 1 Pages 26-28
Published: March 01, 1968
Released on J-STAGE: August 29, 2006
JOURNAL FREE ACCESSThe brown seaweeds have a preference for 85Sr and take this nuclide two to three times as much as 45Ca from sea water. Three kinds of brown seaweeds which previously incorporated 85Sr and 45Ca were administered to rats by a stomach tube. Amount of 85Sr which was retained in these rats was much less than that in control group, while there was no significant difference for 45Ca retention. These facts are attributable to alginate contained in the brown seaweeds.View full abstractDownload PDF (130K) -
Naoko TAKATA, Hironobu WATANABE, Ryushi ICHIKAWA1968 Volume 9 Issue 1 Pages 29-34
Published: March 01, 1968
Released on J-STAGE: August 29, 2006
JOURNAL FREE ACCESSConcentration of 210Pb in various kinds of Japanese foodstuff was measured in order to investigate the relationship between the intake level of the nuclide and the dietary habit in this country. Dietary intake of this naturally-occurring radionuclide was estimated to be around 17 pCi per day by use of the statistical data on the daily consumption of individual foodstuff. This dietary intake level of 210Pb seems to be appreciably high relative to that in European countries. Inter-regional difference of dietary intake level which was found in the present investigation may be ascribable mainly to the local variation of the concentration in vegetables. The largest contributor to the total dietary intake of 210Pb would be sea foods which have relatively high concentration of the nuclide and are being consumed to a considerable extent in this country. This is the most characteristic feature of 210Pb intake in Japan due to the traditional dietary habit.View full abstractDownload PDF (239K) -
Sachiko ICHIMURA, Fumio SAWADA, Kazuo SOMENO1968 Volume 9 Issue 1 Pages 35-39
Published: March 01, 1968
Released on J-STAGE: August 29, 2006
JOURNAL FREE ACCESSPrimary damage in RNase caused by exposure to UV-light was studied by ESR. Frozen aqueous solution of RNase was irradiated by 254 mμ light and ESR spectra and remaining enzymatic activity were measured. ESR spectra showed that the free radicals formed in RNase were localized in chromophores of RNase ; namely tyrosine, phenylalanine and cystine. Effect of warming on the spectra suppored the assignments. The amount of radicals in RNase had linear relationship with the extent of enzyme inactivation.View full abstractDownload PDF (216K)
- |<
- <
- 1
- >
- >|