Abstract
The dry mass of nucleoli from yolky oocytes of T. cristatus, as determined by interference microscopy is about 150 μμg. Less than 10% of this is attributable to RNA that is removable by ribonuclease from formalin-fixed nucleoli. There is a linear relationship between nucleolar dry mass and size. There are basic proteins in oocyte nucleoli and these are bound to the nucleolar RNA. The concentrations of cytochemically detectable RNA and basic protein are higher in the nucleolar core than in the cortex. The ratio of RNA to basic protein is higher in the core than in the cortex, as determined by microdensitometry of nucleoli stained with gallocyanine and fast green. The significance of these observations in relation to the role of the nucleolus in ribosome biosynthesis is discussed.
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Schedule a callMore From: Zeitschrift fur Zellforschung und mikroskopische Anatomie (Vienna, Austria : 1948)
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