APPLICATION OF RADIOISOTOPE-LABELED BACTERIA IN FOOD SANITATION STUDIES. IV. ON THE BACTERIAL CONTAMINATION AND DECONTAMINATION OF LIVING OYSTER (in Japanese)
Decontamination of the living oyster was studied by Y/sup 90/or Y/sup 91/ -labeled coliform bacteria. At low temperature, precultural temperature affected the contamination of the oyster but the uptake of bacteria by the oyster was distinctly observed below 5 deg C. In a study on elapsing change of contamination, it was determined that the whole bacterial load of the oyster depended mainly on the gill, but was not negligible on the digestive tract. The contaminating rate of the oyster was successfully measured by automatic recording of the shift of radioactivity in the contaminated cultural water with a dip-type G-M counter ratemeter and chart recorder, because the bacterial concentration of the closed cultural water decrease according to the bacterial uptake of the oyster. On decontamination of the oyster, it was observed that the most effective temperature existed in the region of 15 to 25 deg C, and at the upper or lower of this region the decontaminating efficiency decreased. As for the exchange rate of the culture water, the decontaminating effect on the oyster was proportional to an increase of the rate to 7.5 times per hour. However, more was of no effect. An increase in the cultured water volume was harmful for the decontamination of the oyster because of the exchanging efficiency of the water. (P.C.H.)
- Research Organization:
- Inst. of Public Health
- NSA Number:
- NSA-17-030217
- OSTI ID:
- 4696929
- Journal Information:
- Proc. Japan Conf. Radioisotopes, Vol. Vol: 5th, No. 4; Other Information: Orig. Receipt Date: 31-DEC-63
- Country of Publication:
- Country unknown/Code not available
- Language:
- Japanese
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