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Extra info for Advances in Water Pollution Research. Proceedings of the Second International Conference Held in Tokyo, August 1964

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2 CLARKE N. , KABLER P. W. and CHANG S. L. 1962 Human enteric viruses in water: source, survival and removability, Proc. \st. Int. Conf. , London. Pergamon Press, Oxford, New York (1964). 3 GREENBERG A. E. , 1951 Tuberculosis transmission by waste waters—a review, Sew. & Industr. Wastes 29, 524. 4 MOELLER A. 1901 Zur Sputumbeseitigung, Z. Tuberk. Heilstatten wes. 2, 147. 5 HEICKEN K. 1956 Uber die Desinfektion Infektioser Abwasser, Zentralbl. Bakt. Abt. Orig. 165, 156. J. J. BOUQUAIX report of Dr.

Personally, 1 think that this increase can be explained in a way by an improveTHE Modern Microbiological and Virological Aspects of Water Pollution 17 ment of virological techniques, because the number of polio virus cultures increase considerably, while it is recognized that regardless of the absence in France of vaccination by live virus, the morbidity by polio is unquestionably diminishing. In other respects, is it necessary to concede great importance to the presence of some viruses in potable waters?

This means that the fish with discriminatory abilities, promptly avoid such toxic concentrations believed to be of the lowest lethal concentration. ATTRACTIVE TOXICANTS AND THEIR ACTIONS The behavior of fathead minnow, Pimephales promelas in gradients of concentration of OH" of caustic soda is shown in FIG. 6. As seen in the variations of thin and thick lines in the upper of the figure, the fathead minnow are shown to avoid narrow areas of water with a pH range from 9-1 to 9-5, and gather in limited areas of water with a pH range from 8-5 to 9-0.

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