By F. F. Nord
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Extra info for Advances in Enzymology and Related Areas of Molecular Biology, Volume 8
The spotted or striated appearance of neurons of warm-blooded animals is due to condensation of the cytoplasmic fibrils which consist of the ribonucleic-acid-containing chromidia (Nissl substance) and the ribonucleic-acid-free interchromidia alternating regularly with each other. It is evident that the clotting and coarsening of the structure of the cytoplasm of the neurons occur rapidly when respiration ceases a t the moment of death of warmblooded animals. It is of interest to note that this change does not occur in excessively stimulated neurons.
Gram-positive and ,Gram-negativebacteria differ greatly from each other in their morphologic and physiologic properties. The protoplasm of the former is differentiated into an interior core and an exterior layer, the latter containing large amounts of ribonucleic acid (see 37). The fibrillar ribonucleic-acid-containing components of the cytoplasm appear to be strongly condensed within the exterior layer of the Gram-positive bacteria as in the case of certain eukaryote cells (see 100, P1. 1, Fig.
They occur whenever a structural rearrangement of the chromosomes takes place. Chromidia, which are connected with each other, may influence each other’s activity. In contrast to the chromosomes the cytoplasmic fibrils have the same properties along their whole length. Nevertheless, it is possible that strucJura1 changes of the cytoplasm are accompanied by changes in the function of the chromidia. These functional changes of the chromidia may be due to fragmentation and elongation of the cytoplasmic fibrils, to loosening and condensation of the cytoplasmic texture, and t o the formation of various structural patterns.