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J. Biophys. and Biochem. Cytol., Vol 8, 267-278, Copyright © 1960 by Rockefeller University Press

ARTICLE

THE FINE STRUCTURE OF Streptomyces coelicolor

: II. The Nuclear Material



David A. Hopwood Ph.D.1 and Audrey M. Glauert 1

1 From the University Botany School and the Strangeways Research Laboratory, Cambridge, England

Colonies and spore suspensions of Streptomyces coelicolor were fixed for electron microscopy by the method of Kellenberger, Ryter, and Séchaud (1958). In thin sections the nuclear regions have a lower average density than the cytoplasm and the outlines of these regions correspond well with the profiles of the chromatinic bodies observed with the light microscope. The nuclear regions contain fibrils, about 5 mµ in diameter. In contrast, after fixation by the method of Palade (1952) the nuclear material is coagulated into irregular dense masses and tubular structures about 20 mµ in diameter, lying in a nuclear "vacuole." The significance of these observations is discussed in relation to the observations of other workers on the fine structure of the nuclear material of other bacteria and the chromosomes of higher cells.

Submitted on January 26, 1960


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