The Action of Ionizing Radiations on Biological Materials: Facts and Theories

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Abstract
A review of recent concepts in radiobiology. An important feature of the action of ionizing radiations on nucleic acids and proteins is denaturation produced by the breaking of hydrogen bonded structures. Simple enzyme molecules are not large enough to provide the necessary sensitivity. It is suggested that large aggregates such as mitochondria or microsomes may be effectively inactivated by single ionizations. An account is given of recent concepts of chromosome structure in relation to the effects of radiation. Some consequences of the fact that the chromosome is a large aggregate of many nucleoprotein particles are discussed. A possible mode of nucleic acid duplication is suggested.

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