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Synthetic DNA as Observed by Microscopic Radioautography pp. 1-70 $100.00
Authors:  (T. Nagata, Department of Anatomy and Cell Biology, Shinshu University School of Medicine, Matsumoto, Japan and Department of Anatomy, Shinshu Institute of Alternative Medicine and Welfare, Nagano, Japan)
Abstract:
Synthetic DNA in cells and tissues of animals can be demonstrated by means of microscopic radioautography using 3H-thymidine as a tracer, coating the tissue sections with photographic emulsion, giving exposure and developing. The specimens can be observed by both light and electron microscopy and we can localize the silver grains due to the radioactivity of incorporated 3H-thymidine in situ.We studied the intracellular localization of newly synthesized DNA in various cells of experimental animals, mice and rats, and clarified that it appeared in both the nuclei and mitochondria of perinatal animals. The nuclear DNA synthesis is active in the epithelial cells such as the epidermal cells of the skin, gastrointestinal epithelial cells of the stomach, intestines, glandular cells of the liver and the pancreas. However, the number of cells synthesizing DNA decreased due to aging of animals. To the contrary, the mitochondrial DNA synthesis can be observed in all the organs not only in the epithelial cells and the numbers of cells showing mitochondrial DNA synthesis did not decrease due to aging of animals. The sites of synthetic DNA in both nuclei and mitochondria are demonstrated in all the organ systems, such as the skeletal, muscular, circulatory, digestive, respiratory, urinary, reproductive, endocrine, nervous and sensory systems. The results obtained are described and discussed. 


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Synthetic DNA as Observed by Microscopic Radioautography pp. 1-70