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Summary Extracellular phage λ has been successively exposed to X-rays and U.V. light. The plaque-forming ability of the irradiated phages was determined on host cells with different repair capacities. No change in sensitivity was found with a pre-treatment of one type of radiation to lethal...
Summary Photolysis of amino acids, peptides and their derivatives leads to the formation of free radicals in these substances. The electron-spin-resonance spectra obtained directly after irradiation at 77 K are not very well resolved. They are recognizable as the superposition of the spectra of...
Summary Ionizing radiation markedly alters the response of the reovirus transcriptase unblocking mechanism to stimulation by K + ions, which normally trigger the switch-on of transcription in this system. In irradiated subviral particles the concentration of K + ions needed to trigger switch-on...
Summary Human lymphocyte cultures are exposed to 1·5 MHz continuous wave ultrasound, and it is demonstrated that cell death, as monitored by pyknosis, follows immediately on sonication at intensities within the usual therapeutic range (< 1·7 W/cm 2 , spatial average). The number of cells...
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