Immunocytochemical localization of the elongation factor Tu in E. coli cells

The localization of the elongation factor Tu (EF-Tu) in ultrathin cryosections of E. coli cells was determined with the electron microscope using a highly specific immunological labelling technique. EF-Tu is distributed almost homogeneously throughout the cytoplasm. Although it has often been suggested that EF-Tu could be part of a putative prokaryotic cytoskeleton, we did not find any evidence for supramolecular assemblies, such as fibres or filaments, containing a large amount of EF-Tu. EF-Tu was not observed in association with the outer cell membrane and periplasmic space. A topological relationship with the inner membrane is not apparent in our micrographs. In cells in which the EF-Tu level is raised significantly, the protein piles up in discrete cell regions.     

Further evidence for a cell surface proteinase essential to the growth of cultured fibroblasts

Specific antibodies and protein proteinase inhibitors will inhibit cell-surface proteinase activity on human fibroblasts and cause a concomitant inhibition of DNA synthesis and of cell multiplication. An insolubilized proteinase inhibitor also inhibits cell multiplication. The same reagents partially inhibit the multiplication of mouse L cells, both in monolayer and suspension culture, and inhibit the mitogenic effect of epidermal growth factor (EGF) on both types of cell.     

Effect of Transcranial Magnetic Stimulation on Short- and Long-Term Memory in Healthy Subjects and Patients with Parkinson’s Disease

The effect of transcranial magnetic stimulation (TMS) of the right and the left frontotemporal areas on the short- and long-term verbal memory was studied in healthy subjects and patients with Parkinson’s disease. TMS with a magnetic induction of more than 1.2 T at 10 Hz was found to affect the short-term memory when applied to the left frontotemporal area and to have no significant effect on this type of memory when applied to the right frontotemporal area. In healthy subjects, TMS applied to the left or the right hemisphere did not affect the long-term memory. However, in patients with Parkinson’s disease, significant changes in the long-term memory were observed upon TMS of either the left or the right hemisphere. The effect was more evident on TMS of the right hemisphere.__________Translated from Fiziologiya Cheloveka, Vol. 31, No. 4, 2005, pp. 33–36.Original Russian Text Copyright © 2005 by Gimranov, Mal’tseva.