Advances in Water Pollution Research: Proceedings of the by O. Jaag

By O. Jaag

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Additional info for Advances in Water Pollution Research: Proceedings of the Second International Conference Held in Tokyo, August 1964 (Volume 1)

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K. is for the greater part contamination by air traffic and the few B. K. that can be found in water represent an extremely reduced danger. The presence of salmonellae is not surprising because of the eventual contamina­ tion proceeding not only from ill humans but also from a number of animals which can be carriers of these germs. We like to point out that in this respect VAN OYE has observed a high contamination in many intraurban ponds by salmonellae typhimurium originating probably from pigeons and gulls that frequent these ponds.

These two stocks have been isolated during a very cold period in the beginning of the year 1963. (b) Characteristics of isolated stocks of pathogenic Mycobacteria. (1) Mycobacterium tuberculosis. On a total of 42 positive tests including 42 cultures and 65 guinea-pigs, 50 stocks of Koch bacilli have been isolated, 38 on the guinea-pig, 8 on the culture, 4 on both guinea-pig and culture. All these stocks belong to the human type and react positively to the nicotinic acid test. H. only. H, a concen­ tration of very high clinical sigificance; one single stock, isolated at the discharge level into the river from preventorium waste, shows normal sensitivity to this anti­ biotic (50 per cent resistant colonies at 0,1 y/cm2).

JONES et al*). E. JONES, 11 ). Thus, further investigations of reaction test have been almost abandoned and endeavor is being concentrated to determine the toxicities of many pollutants for the protection of aquatic lives. Even though the maximum concentrations of pollutants which permit indefinite survival to fish could be determined, there is still no proof that fishing grounds can be kept in sound condition. If fish avoid these pollutants and disappear from the fishing ground, the ground must lose its economic value.

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