Abstract
A small nuclear part of living interphase cells derived from eight kinds of animal species was irradiated with an ultraviolet (UV) microbeam, and the subsequent changes of the irradiated part were observed by phase-contrast and UV microscopy, microspectrography, and staining with the Feulgen and pyronine-methyl green methods. In these cells, the photo-reactions were divided into three types on the basis of phase-microscopic and deoxyribonucleic acid (DNA) changes. In type 1, the irradiated part was observed as a pale-contrast and decreased UV absorption area in newt peritoneal leukocytes and grasshopper spermatocytes. In type 2, the irradiated part appeared as a dark-contrast and increased UV absorption area in two kinds of human cells in culture, cultured chick embryonic fibroblasts, and two kinds of ascites tumor cells. In type 3, in human blood monocytes, the phase contrast of the irradiated part changes from pale to dark proportionally with the irradiation doses on contrast to a progressive decrease i...
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