Microbiology: A Text-book of Micro÷rganisms, General and Applied

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P. Blakiston's son & Company, 1911 - Micro-organisms - 724 pages

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Page 54 - ... extent and depth of local glaciations; but this obvious fact does not in the least justify the assumption that either the universal low temperatures and extensive glaciations of ice ages or the world-wide genial temperatures of the intervening periods had, on the whole, any such origin. It may be worth while, in this connection, to call attention to the fact that the thickness or depth of a glacial sheet cannot continue indefinitely to increase with increase of elevation, but, on the contrary,...
Page 541 - At the outset it is necessary to have a clear understanding of what is meant by the terms immunity and susceptibility.
Page 26 - ... f, chains of oidia from a branching outgrowth of a submerged cell; h, branching chain of oidia; k, I, m, n, o, p, s, types of germination of oidia under varying conditions; t, diagram of a portion of a colony showing habit of Oidium lactis as seen in culture media.
Page 3 - Those who pretend to explain the putrefaction of animal substance by the presence of microorganisms reason very much like a child who would explain the rapidity of the Rhine by attributing it to the violent motions imparted to it in the direction of Burgen by the numerous wheels of the mills of Venice".
Page 515 - The leaves and runners wilt suddenly as if from lack of water or too hot sun, the runner becoming prostrate on the ground. From two to three days usually elapse before the wilting of the whole vine is complete, and it...
Page 162 - B. coli and B. prodigiosus, respectively, and then were exposed bottom side up to the direct rays of the January sun for four hours. At the moment of exposure the figure 0, cut from black paper, was pasted to the plate, shading the bacteria underneath. After one, two and three hours the corresponding figures were pasted to the plates. The above picture was taken twenty-four hours after exposure, proving that three or four hours' exposure to direct sunlight weakens and may even kill bacteria.
Page 544 - ... of men differ in their resistance and their susceptibility to infectious diseases. As example of racial immunity among animals the native cattle of Austria-Hungary and of Japan which are relatively immune to bovine tuberculosis, a disease which causes great loss among other races, may be mentioned. Again, the sheep of Algeria are relatively immune to anthrax while all other sheep are extremely susceptible. Field mice are immune to glanders while the common. house mouse is susceptible. The negro...
Page 226 - ... the world of the living and the world of the dead, such as exist in native forms of spiritism.1 After death every spirit goes to the nether world in Tuma.
Page 221 - Woodhead conducted an investigation as a result of which he concluded that no organisms capable of setting up morbid changes in animals after inoculation came from the tank. Pickard introduced an emulsion of typhoid bacilli into the Exeter tank and observed a slow diminution in number. It is important to note, however, that even after fourteen days 1 per cent of the original number was still alive. Pickard also reported a removal of...
Page 424 - ... will consist of extremely small rod-like bacteria. These produce acetic acid (vinegar acid) from alcohol. When acetic acid is perceptible to the taste the wine is spoiled. Wines high in alcohol are less liable to acetic fermentation than weaker wines. Sound wines containing over 14 per cent by volume are almost immune, but such wines may be spoiled during fermentation by the growth of acetic bacteria on the exposed floating cap of pomace.

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