Journal of Radiation Research
Online ISSN : 1349-9157
Print ISSN : 0449-3060
Search
Advanced search
OR
Browse
Search
Volume 12, Issue 1
Displaying 1-5 of 5 articles from this issue
Show all abstracts
    • |<
    • <
    • 1
    • >
    • >|
  • Theory of Radiation Effect on Cell Populations in Intestinal Epithelium
    Fumiaki SATO, Akihiro SHIRAGAI, Takeshi HIRAOKA, Tetsuo INADA, Katsuhi ...
    1971 Volume 12 Issue 1 Pages 1-6
    Published: March 01, 1971
    Released on J-STAGE: August 29, 2006
    DOIhttps://doi.org/10.1269/jrr.12.1
    JOURNAL FREE ACCESS
    Show abstractHide abstract
    Some simple mathematical models were developed to analyze the kinetics of the cell populations in the intestinal epithelium after an exposure to ionizing radiation. For the proliferative cells in crypt a logistic proliferation was assumed and for the functional cells in villus the compartment was assumed to be a first in-first out type. A feedback mechanism is introduced between the two compartments. Mechanisms of the effects of radiation on the system were considered by cell deaths, including delayed deaths, and by mitotic delay. The calculated results showed reasonable amount of over-shoot in the cell numbers in the recovery period and were in general consistent with the experiment.
    View full abstract
    Download PDF (208K)
  • Changes in the Mouse Electrocorticograms (ECoG) after X-Irradiation
    Takeru MINAMISAWA, Hiroshi SUGIYAMA, Takehiko TSUCHIYA, Hideo ETO
    1971 Volume 12 Issue 1 Pages 7-16
    Published: March 01, 1971
    Released on J-STAGE: August 29, 2006
    DOIhttps://doi.org/10.1269/jrr.12.7
    JOURNAL FREE ACCESS
    Show abstractHide abstract
    The effects of X-rays on the electrocorticograms (ECoG) of mice which had received 300 R of X-rays to the head were studied. The ECoG were recorded in half-restrained animals with chronically implanted cortical electrodes, and were stored on FM magnetic tape. The ECoG recordings were classified into 7 frequency bands by means of an EEG frequency analyzer, and the amplitude of each wave was measured. After X-irradiation the percentage of the waking pattern in the ECoG decreased and reached a minimum 2 to 5 hours after exposure. This was followed by a gradual increase, and a return to control level on the 5th day. Bursts which were composed of 2-4 sec trains of 9-11 c/sec occurred more frequently after exposure. The amplitude of δ2, δ1, θ and α waves was above control level for 5 days after irradiation. The implications of the effects of X-rays on the mouse ECoG are discussed.
    View full abstract
    Download PDF (369K)
  • Uptake of 58Co by Mussel, Mytilus edulis
    Makoto SHIMIZU, Takeshi KAJIHARA, Ippei SUYAMA, Yoshio HIYAMA
    1971 Volume 12 Issue 1 Pages 17-28
    Published: March 01, 1971
    Released on J-STAGE: August 29, 2006
    DOIhttps://doi.org/10.1269/jrr.12.17
    JOURNAL FREE ACCESS
    Show abstractHide abstract
    Uptake of radioactive cobalt (58Co) by shellfish was determined by tracer experiments using mussel, Mytilus edulis, which has a world-wide distribution and is considered to be a sufficiently reliable indicator organism of radioactive contamination of the marine environment. As for soft tissues accumulation was high in the alimentary tract, and low in the mantle and the adductor muscle. However high concentration factors in the byssus (1, 500) and shell (190) were noticeable. By means of immersion experiments of shell pieces and cut off pieces of the byssus in 58Co containing sea water, it became evident that the high accumulation of 58Co by the byssus and shell was due to surface adsorption. Discussions are given on the utility of mussel as an indicator organism and on the role of structural protein of shellfish in the adsorption of radionuclides.
    View full abstract
    Download PDF (485K)
  • The Effects of γ-Radiation and Heat on the Germination of Spores of Clostridium Botulinum Type E
    Yoshiaki ANDO
    1971 Volume 12 Issue 1 Pages 29-36
    Published: March 01, 1971
    Released on J-STAGE: August 29, 2006
    DOIhttps://doi.org/10.1269/jrr.12.29
    JOURNAL FREE ACCESS
    Show abstractHide abstract
    Spores of Clostridium botulinum type E were exposed either to various doses of γ-rays or to lethal and sublethal temperatures, then the effects on germination were studied by using the following two defined media: (A) L-alanine + glucose + bicarbonate and (B) L-alanine + lactate +bicarbonate. An increased inhibition of germination either by raising the temperature or by increasing the dose level was observed when medium A was used. On the other hand, activation by heat, but no activation by γ-radiation were observed when medium B was used. The heat activation was unaffected by additional pre or post-irradiation. The amount of DPA released from spores by treatment with heat increased progressively with elevating temperatures, whereas no detectable amount of DPA was released by γ -irradiation at any of the sublethal doses applied. From the results that spores of Clostridium botulinum type E can be activated by heat but not by γ-radiation, could be explained on the basis of the difference in the manner of breaking dormancy between two agents.
    View full abstract
    Download PDF (360K)
  • Reaction of Radioprotective Amines with Pyridoxal
    Yoshikazu MATSUSHIMA, Sanya AKABOSHI
    1971 Volume 12 Issue 1 Pages 37-39
    Published: March 01, 1971
    Released on J-STAGE: August 29, 2006
    DOIhttps://doi.org/10.1269/jrr.12.37
    JOURNAL FREE ACCESS
    Show abstractHide abstract
    The authors present the new postulate that amines that form dissociable heterocyclic compounds with the aldehyde group of pyridoxal in the solutions under physiological conditions have the radioprotective activities. The implications of the postulate for some chemical and biological systems are discussed.
    View full abstract
    Download PDF (101K)
    • |<
    • <
    • 1
    • >
    • >|
feedback
 Top