A text-book of general bacteriology

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The Macmillan Company, 1910 - History - 340 pages
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Page 161 - H1SOa to neutralize 1 cc of the culture fluid at the negative pole, and all the most resistant forms of bacteria were destroyed at the positive pole, including anthrax and subtilis spores. At the negative pole anthrax spores were killed also, but subtilis spores remained alive for four hours.
Page 2 - I saw with wonder that my material contained many tiny animals which moved about in a most amusing fashion; the largest of these (A, Fig. 1) showed the liveliest and most active motion, moving through the water or saliva as a fish 2 17 of prey darts through the sea; they were found everywhere, although not in large numbers.
Page 343 - A Manual of Determinative Bacteriology BY FREDERICK D. CHESTER Bacteriologist of the Delaware College Agricultural Experiment Station, and Director of the Laboratory of the State Board of Health of Delaware: Member of the Society of American Bacteriologists; of the Society for the Promotion of Agricultural Science; and of the American Public Health Association...
Page 160 - The temperature produced by such a current does not rise above 37 C., and the electrolytic products are antiseptic but not germicidal. 3. A continuous current of 100 milliamperes passed through bouillon cultures for seventy-five minutes kills all non-resistant forms of bacteria even if the temperature is artificially kept below 37 C. The effect is due to the formation of germicidal electrolytic products in the culture. Anthrax spores are killed in .two hours. Subtilis spores were still alive...
Page 162 - Rontgen rays after forty-eight hours' exposure at a distance of 20 mm. from the tube. " 10. Suspensions of bacteria in agar plates and exposed for four hours to the rays, according to Rieder's plan, were...
Page 161 - Anthrax spores are killed in two hours. Subtilis spores were still alive after the current was passed for three hours. 4. A continuous current passed through bouillon cultures of bacteria produces a strongly acid reaction at the positive pole, due to the liberation of chlorin which combines with oxygen to form hypochlorous acid. The strongly alkaline reaction of the bouillon culture at the negative pole is due to the formation of sodium hydroxid and the liberation of hydrogen in gas bubbles. With...
Page 344 - ... American needs, and of about the right size and grade of difficulty. It probably most nearly approaches the perfect text-book for use with a college class in this subject of any now published. Practical Organic Chemistry for Advanced Students By JULIUS B. COHEN London, 1907 Cloth, 272 pages, lmo, $0.80 net.
Page 4 - ... water or saliva. Further, the greater part of the material consisted of an extraordinary number of rods, of widely different lengths, but of the same diameter. Some were curved, some straight, as is shown in F; they lay irregularly and were interlaced. Since I had previously seen living animalcules...
Page 160 - The effect is a purely physical one. "2. A continuous current of 48 milliamperes passed through bouillon cultures for from two to three hours does not kill even non-resistant forms of bacteria. The temperature produced by such a current does not rise above 37 C.
Page 162 - Tesla currents — have neither antiseptic nor bactericidal properties when passed around a bacterial suspension within a solenoid. When exposed to the brush discharges, ozone is produced and kills the bacteria. 9. Bouillon and hydrocele-fluid cultures in test-tubes of non-resistant forms of bacteria could not be killed by Rontgen rays after forty-eight hours' exposure at a distance of 20 mm.

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