By Harris Busch (Eds.)
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Additional info for The Cell Nucleus. Volume 1
Sample text
Although the nuclei are completely devoid of nuclear envelope and ribosomes, the nuclear fraction catalyzes protein formation. T h e activity is preferentially associated with the nucleolus ( X 8 , 0 0 0 ) . what is known of the distribution of nuclear proteins in situ ( see above ) , they concluded that the distribution of proteins elaborated in vitro was essentially similar and concerned primarily the nucleolus and the nucleoplasm (Fig. 1 2 ) . The practice of parallel experiments with acid or basic amino acids might help to differentiate between various nuclear proteins in terms of localization (Laval and Bouteille, 1974a).
1970), who found labeling over the condensed intranucleolar chromatin and attempted, so far without success, to relate this activity with what could be considered as intranucleolar dispersed chromatin. Perinucleolar labeling was also observed by Comings and Kakefuda ( 1968 ) and Ockey (1972) and in phytohemagglutinin-stimulated lymphocytes by Milner 3 and Hayhoe (1968). In the same material, long pulses of [ H ] T d R were applied by Tokuyasu et al. ( 1 9 6 8 ) , who claimed to observe a third of the activity in the interstitial space of the nucleolonema, about half of it in the nucleolar-associated chromatin and the rest in the nucleolonema itself.
B. Extranucleolar RNP This section deals with nuclear structures or organelles, the RNA content of which has been cytochemically established or suggested. So far 1 . Localization of Nuclear 25 Functions their autoradiographic analysis has not been carried out because in most cases their sizes are below the practical level of resolution for this technique, although the method of density distribution (Salpeter et al, 1969) could be applied to the study of these structures. Therefore, the information now available has been provided by morphological examination and chiefly by means of electron microscope cytochemistry.
