- Volume 11, Issue 2, 1954
Volume 11, Issue 2, 1954
- Article
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The Inactivation of Free Bacteriophage by Irradiation and by Chemical Agents
More LessSUMMARY: Shigella phage S13 and coli phage T3 are very sensitive, in the free state, to inactivation by reducing radicals produced in water by ionizing radiation. They are inactivated by ascorbic acid, and by hydrogen peroxide (H2O2) acting as a reductant; but the H2O2 must decompose into active radicals before it attacks the phage. Hydrogen peroxide decomposes under irradiation, and attacks phage much more vigorously under ionizing radiation than under ultraviolet irradiation. Free radicals may part-inactivate phage, that is, render it more sensitive to H2O2 and to ascorbic acid, though not to inactivating agents in general. Phage grown on rich medium is more sensitive than phage grown on poor medium to inactivation by reduction.
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Some Properties of Influenza Virus Filaments shown by Electron Microscopic Particle Counts
More LessSUMMARY: A strain of influenza virus A which produced abundant filaments was more efficient in agglutinating red cells than non-filamentous strains. This was shown by counts of the number of particles (i.e. filaments and spheres)/agglutinating dose; the ratios found were 106·6 for the filamentous, and 107·2 for the non-filamentous strains. The increased efficiency of agglutination was shown by filtration experiments to be due to the filaments. There was no corresponding increase in the efficiency of initiating infection. Treatment of a filamentous preparation with ultrasonic vibrations caused breakdown of the filaments, an increase in agglutination titre but no change in the infectivity titre.
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