Nippon Saikingaku Zasshi
Online ISSN : 1882-4110
Print ISSN : 0021-4930
ISSN-L : 0021-4930
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Volume 28, Issue 3
Displaying 1-3 of 3 articles from this issue
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  • [title in Japanese]
    1973 Volume 28 Issue 3 Pages 315-338
    Published: May 25, 1973
    Released on J-STAGE: February 19, 2009
    DOIhttps://doi.org/10.3412/jsb.28.315
    JOURNAL FREE ACCESS
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  • Studies on the Filament Forms of Pseudomonas aeruginosa by Cinematography
    Yoetsu HACHISUKA, Shiro SAITO, Kaname TSURUMI, Tadashi TANAKA, Kenichi ...
    1973 Volume 28 Issue 3 Pages 339-342
    Published: May 25, 1973
    Released on J-STAGE: February 19, 2009
    DOIhttps://doi.org/10.3412/jsb.28.339
    JOURNAL FREE ACCESS
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    Normal growth, formation of filament forms, and recultivation of the filament forms were studied on Pseudomonas aeruginosa with the aid of the motion picture. The results obtained are as follows.
    1) P. aeruginosa changed into filament forms and spheroplasts when cultivated on an agar medium containing 100mcg/ml of sulfobenzyl penicillin (SB-71).
    The spheroplasts had balloon-like projections, which increased gradually in size with cytoplasm moving into them. Finally, the projections bursted.
    2) Filament forms collected from the medium containing SB-71 and cleaned by washing with M/20 phosphate buffer (pH 7.2) were recultivated on the renewed agar medium. Normal forms of P. aeruginosa appeared after one another by division from both sides of each filament form.
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  • Studies on Biological Characteristics and Pathogenicity of Yersinia enterocolitica
    I. Comparison of Growth Temperature Range between Y. enterocolitica and Other Enteropathogenic Bacteria
    Tsutomu MARUYAMA
    1973 Volume 28 Issue 3 Pages 343-349
    Published: May 25, 1973
    Released on J-STAGE: February 19, 2009
    DOIhttps://doi.org/10.3412/jsb.28.343
    JOURNAL FREE ACCESS
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    In order to ascertain the temperature range of growth of Yersinia enterocolitica, together with Yersinia pseudotuberculosis, the patterns of viable cell counts at various incubation periods were compared between these species and the known three groups of enteropathogens, Salmonella, Shigella, and enteropathogenic Escherichia coil, by using a temperature-gradient incubator.
    The growth temperature of Y. enterocolitica ranged from 0 to 44C. It was quite similar to that of Y. pseudotuberculosis. The optimal growth temperature of Y. enterocolitica was assumed to be around 30C. In contrast to this, the growth temperature range of the other three groups of enteropathogens ranged from 7 to 47C. The optimal growth temperature of these organisms ranged from 36 to 43C. The minimum generation time of Y. enterocolitica was calculated to be 41.3-47.5 minutes at the age of 4-8 hours of incubation at 25-30C, while that of the other organisms was 24.7-28.7 minutes at the age of less than 4 hours of incubation at 36-42C.
    Therefore, it was concluded that Y. enterocolitica was unique among enteropathogenic bacteria, since it was characterized by its psychrophilic property and fairly long generation time.
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