Some Factors Affecting the Activation of Virus Preparations Made from Tobacco Leaves Infected with a Tobacco Necrosis Virus

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Abstract
The technic for extraction of the viruses is given. The infectivity and serological activity (which are not parallel) of fractions subject to different treatments vary greatly and infectivity may even be greater after extraction. The general implications of these findings for extraction of viruses are discussed; anomalous material separated by ultra-centrifugation is by no means always infective.
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