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Volume 9, Issue 2
Displaying 1-4 of 4 articles from this issue
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Takeshi YAMADA1968 Volume 9 Issue 2 Pages 41-49
Published: June 01, 1968
Released on J-STAGE: August 29, 2006
JOURNAL FREE ACCESSIntracellular concentrations of intermediates and cofactors of glycolysis were measured in γ-irradiated Ehrlich ascites tumor cells. Changes in the levels of intermediates and comparison of mass-action ratios with the equilibrium constants for the reactions of glycolysis revealed a remarkable enhancement of phosphofructokinase activity and inhibitions at the triosephosphate dehydrogenase and pyruvate kinase steps. The possible mechanisms involved in the alteration of these regulatory enzymes in glycolysis were discussed.View full abstractDownload PDF (423K) -
Kazuhisa KAMEDA, Makoto SHIMIZU, Yoshio HIYAMA1968 Volume 9 Issue 2 Pages 50-62
Published: June 01, 1968
Released on J-STAGE: August 29, 2006
JOURNAL FREE ACCESSIn order to know the concentration factor of Zn in marine organisms, shellfish, echinoderm and fish were kept in sea water containing 65Zn and the uptake of radioactivity by organisms was traced.
Two series of experiments were carried out. In the experiment A, the distribution of the nuclide and concentration factor in each organ and tissue were observed. In the experiment B, the influence of Zn content in sea water on the uptake of radioactive Zn was checked by means of the whole body counting. Zn determination was made on the muscle of T. japonica to obtain the concentration factor which was compared with that obtained by tracer experiment.
The concentration factors of Zn are different in different organisms as well as in different tissues and the following figures were obtained ; 3-20 for fish, 50-400 for shellfish and 15-500 for sea urchin. However, as the equilibrium was not reached in many of organs and tissues within 42 days of experimental period, higher values should be considered as the concentration factor at the equilibrium condition. The concentration factor for the muscle of T. japonica was observed to be 5, 600 by chemical analysis and 50 by tracer experiment. The cause of this big discrepancy is yet unknown but may be partly due to the fact that Zn content of sea water changed greatly during the rearing experiment.View full abstractDownload PDF (522K) -
Hanato TSURUGA1968 Volume 9 Issue 2 Pages 63-72
Published: June 01, 1968
Released on J-STAGE: August 29, 2006
JOURNAL FREE ACCESSThe analytical procedure for the radionuclides of Mn, Fe, Co, Zn, Zr, Ru and Ce in biological materials was improved and these radionuclides in marine organisms in the coastal waters of Japan collected in the period of 1964 to 1966 were analysed. The marine biota examined consisted of plankton, benthic algae, . molluscs and fishes, and freshwater organisms were also analysed for comparison.
The radionuclides, 55Fe, 106Ru+106Rh and 144Ce+144Pr, were recognized as the main contaminants in the organisms, and their concentrations were generally higher in organisms in open seashore than those in estuary or embayment. The presence of 106Ru + 106Rh and 144Ce + 144Pr was observed commonly in plankton, littoral seaweeds and benthic molluscs, whereas these radionuclides were negligible in the muscle of nektonic organisms. The concentrations were particularly high in red algae, Gelidium spp., and benthic molluscs. In the latter the concentration of 106Ru+106Rh was higher than that of 144Ce+144Pr, which was reverse to the relative concentration in sea water, and the major portion of these radionuclides was found in the viscera.
In the muscle of nekton, 55Fe was dominant and in the mackerel a value ten times higher than those in the bottom fish, shark and squid was observed.
54Mn was found in the oyster and fan shell which were collected respectively in estuary and embayment, and also in a bottom fish, Beryx splendens. 60Co was detected in red algae, Gelidium spp., hard clam and top shell in open seashore, but 65Zn was found in none of the organisms assayed here.View full abstractDownload PDF (447K) -
Toshio SEKIKAWA, Sadamu MOCHIZUKI1968 Volume 9 Issue 2 Pages 73-83
Published: June 01, 1968
Released on J-STAGE: August 29, 2006
JOURNAL FREE ACCESSFor measuring the mobility spectrum of radioactive charged aerosols, a newly designed parallel plate type spectrometer was constructed in 1966-1967, on the basis of the Erikson's spectrometer. By this spectrometer, positive and negative mobility spectra, and the concentrations of both the signs in each fine range of mobility are obtained simultaneously from the same sampled aerosol particles. In this paper, theory of measurements of mobility spectra, examinations of air flow pattern in the chamber and tests for some radioactive aerosols stored in a vessel are described.View full abstractDownload PDF (448K)
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