2,836 research outputs found
Effect of hyperbaric oxygenation on carbohydrate metabolism protein synthesis in the myocardium during sustained hypodynamia
Glycolysis and the intensity of protein synthesis were studied in 140 white male rats in subcellular fractions of the myocardium during 45 day hypodynamia and hyperbaric oxygenation. Hypodynamia increased: (1) the amount of lactic acids; (2) the amount of pyruvic acid; (3) the lactate/pyruvate coefficient; and (4) the activities of aldolase and lactate dehydrogenase. Hyperbaric oxygenation was found to have a favorable metabolic effect on the animals with hypodynamia
Mechanism of disorder of plastic processes in tissue during prolonged hypokinesia
The subcellular structures of the myocardium, skeletal muscles, liver and kidneys of adult rats subjected to hypokinesia (in immobilization chambers) for 15, 30, and 45 days were studied. An anabolyser (retabolil) and vitamin D (a Ca metabolism regulator) were administered to two groups of rats. On the second week of hypokinesia, inhibition of synthesis processes was observed. Administration of retabolil increased protein synthesis both in the normal and hypokinesia-subjected rats; however, in the latter group, synthesis did not completely normalize, especially in the myocardium. Administration of vitamin D also stimulated protein synthesis, apparently by normalizing Ca tissue metabolism. The combined action of both preparations was the most effective in normalizing protein synthesis intensity. It was concluded that inhibition of synthesis is related to weakening of hormone synthesis induction and disorder of Ca metabolism
Giant acceleration in slow-fast space-periodic Hamiltonian systems
Motion of an ensemble of particles in a space-periodic potential well with a
weak wave-like perturbation imposed is considered. We found that slow
oscillations of wavenumber of the perturbation lead to occurrence of directed
particle current. This current is amplifying with time due to giant
acceleration of some particles. It is shown that giant acceleration is linked
with the existence of resonant channels in phase space
The Ground State of the ``Frozen'' Electron Phase in Two-Dimensional Narrow-Band Conductors with a Long-Range Interelectron Repulsion. Stripe Formation and Effective Lowering of Dimension
In narrow-band conductors a weakly screened Coulomb interelectron repulsion
can supress narrow-band electrons' hopping, resulting in formation of a
``frozen'' electron phase which differs principally from any known macroscopic
self-localized electron state including the Wigner crystal. In a zero-bandwidth
limit the ``frozen'' electron phase is a classical lattice system with a
long-range interparticle repulsion. The ground state of such systems has been
considered in the case of two dimensions for an isotropic pair potential of the
mutual particle repulsion. It has been shown that particle ordering into
stripes and effective lowering of dimension universally resides in the ground
state for any physically reasonable pair potential and for any geometry of the
conductor lattice. On the basis of this fact a rigorous general procedure to
fully describe the ground state has been formulated. Arguments have been
adduced that charge ordering in High-T_c superconductors testifies to presence
of a ``frozen'' electron phase in these systems.Comment: 5 pages, LaTeX 2.09, 1 figure in external PostScript files. To appear
in Phys.Rev B Rapid Communication
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