I T appears to be highly probable (Br0ndsted, 1953) that starvation retards regeneration in planarians. This finding justifies closer investigation into the importance of various substances for regeneration. Regeneration is of course a very complicated phenomenon and involves chains and networks of innumerable chemical processes. Amongst the substances involved it seems profitable to focus on t...

This communication describes the characterization of elongation factor G from Bacillus subtilis by the translocation of "native" peptide donors. Translocation was followed by elongation factor G-dependent increase in the synthesis of peptidyl-[3H]puromycin using "washed" ribosomes carrying in vivo-bound peptidyl-transfer ribonucleic acid ("native" peptidyl-transfer ribonucleic acid) molecules a...

Removal of deoxyribonucleic acid from meristematic onion root cells grown in solutions of kinetin, followed by metachromatic staining in azure B bromide, indicated the presence of appreciable amounts of ribonucleic acid in nuclei exposed to the cell division factor.