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  • 1.
    Molin, Nils
    et al.
    SIK – Svenska institutet för konserveringsforskning.
    Ehrenberg, L.
    Anti-bacterial action of irradiated glucose1964In: International Journal of Radiation Biology, ISSN 0955-3002, E-ISSN 1362-3095, Vol. 8, no 3, p. 223-231Article in journal (Refereed)
    Abstract [en]

    It is shown that ?irradiated glucose has a strong, anti-bacterial action on Pseudomonas sp. 128. Irradiation of the water solution of glucose is more effective than irradiation of modifications of crystalline glucose. Part of the anti-bacterial effect remains after storage of the irradiated solution for six days at 20°c. After treatment with irradiated glucose the surviving bacteria are found to be more resistant to a repeated treatment. The bactericidal action of irradiated glucose increases with decreasing ph of the test solution, and was abolished by added catalase. The possible nature of the anti-bacterial factor(s) in irradiated glucose is discussed. © 1964 Informa UK Ltd All rights reserved: reproduction in whole or part not permitted.

  • 2.
    Tear, J.
    SIK – Svenska institutet för konserveringsforskning.
    The effect of ionizing radiation on a marine pseudomonas sp.: II. The total effects on populations in different growth-phases1963In: International Journal of Radiation Biology, ISSN 0955-3002, E-ISSN 1362-3095, Vol. 7, no 1, p. 21-28Article in journal (Refereed)
    Abstract [en]

    Inactivation of Pseudomonas sp. No. 128 was found to be independent of concentration up to a critical level of 2 × 108 org./ml. The highest sensitivity was noted in the exponentially-growing cultures, and the highest resistance in cultures in the negative accelerating growth-period (0·5 and 50·0 per cent survival, respectively, for 10·0 krad established immediately after irradiation). Resistance was essentially the same during lag and late declining periods (1·0 per cent survival for the standard dose used). Exponentially-growing cultures showed a continuously increasing inactivation on delay of the plating after irradiation (from 0·5 to 0·005 per cent survival at 10·0 krad). No such effects were noted for cultures in late declining or maximum stationary growth-periods. Survival-curves for samples taken from maximum stationary and declining growth-periods were exponential. A cumulative type of survival-curve was noted for organisms from the lag and logarithmic periods of growth. © 1963 Informa UK Ltd All rights reserved: reproduction in whole or part not permitted.

  • 3.
    von Sydow, Erik
    et al.
    SIK – Svenska institutet för konserveringsforskning.
    Tear, J.
    The effect of ionizing radiation on a marine pseudomonas sp.: I. Effects of irradiated liquid glucose-salt medium on populations in exponential-growth phase1963In: International Journal of Radiation Biology, ISSN 0955-3002, E-ISSN 1362-3095, Vol. 7, no 1, p. 11-19Article in journal (Refereed)
    Abstract [en]

    The effect of ionizing radiation on a marine Pseudomonas sp. has been tested under the following experimental conditions: 1. Unirradiated cells inoculated into irradiated media. 2. Irradiated cells plated immediately after irradiation. 3. Irradiated cells incubated in irradiated media. In this study irradiated liquid synthetic medium was found to have a bactericidal effect on a radiosensitive marine Pseudomonas sp. taken from exponentially-growing cultures. These indirect toxic effects of the irradiated media were, however, relatively small compared with the total effect of direct irradiation of the organisms in suspensions. The indirect toxic effects of the medium were found to decrease slowly with time. They were assumed to be due mainly to the combination of glucose and ammonium chloride in the medium. The turbidimetric method used was found to be time-saving and gave accurate results. It can thus be recommended for similar investigations. © 1963 Informa UK Ltd All rights reserved: reproduction in whole or part not permitted.

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