Quantum diffusion of muons in bismuth

A muon spin relaxation rate in a super-pure sample of bismuth has been measured. The experimental data and the theory of coherent diffusion in crystalline lattices with shifted levels are compared.     

The problem of “thermal explosion” in spin-polarized atomic hydrogen gas

The exponential character of the depolarization-rate temperature dependence in spin-polarized atomic hydrogen gas results in a “thermal explosion” phenomenon with increasing density. The inhomogeneous heating is stimulated by the three-body recombination, which in allowance for dipole-dipole interaction takes place at arbitrary spin states of colliding particles. The critical gas density is found to be in the range of 10¹⁸–10¹⁹ cm^?3 for the real parameters of the system.     

Canonical decomposition of projective and affine killing vectors on the tangent bundle

For an affine connection on the tangent bundle T(M) obtained by lifting an affine connection on M, the structure of vector fields on T(M) which generate local one-parameter groups of projective and affine collineations is described. On the T(M) of a complete irreducible Riemann manifold, every projective collineation is affine. On the T(M) of a projectively Euclidean space, every affine collineation preserves the fibration of T(M), and on the T(M) of a projectively non-Duclidean space which is maximally homogeneous (in the sense of affine collineations) there exist affine collineations permuting the fibers of T(M).Translated from Matematicheskie Zametki, Vol. 19, No. 2, pp. 247–258, February, 1976.     

Investigation of the reflectivity of highly doped gallium arsenide in a wide spectral range

The optical properties of highly doped single crystals and diffused layers of p-type gallium arsenide were investigated in the spectral range from 0.2 to 25. A technique has been suggested and experimentally tested; it provides for transparent selective coatings and their application, as well as for a modification of the surface microrelief for reducing the reflection coefficient in the desired spectral range.     

The Epimerization of Trimethylsilyl Ethers During Their Gas Chromatographic Analysis

We are grateful to the donors of the Petroleum Research Fund, administered by the American Chemical Society, to the National Science Foundation and to the Research Board of the University of Illinois for support of this research, to Dr. B. Willhalm for useful comments and to the Department of Organic Chemistry, University of Geneva, for its hospitality (1971/72).     

Mitochondrial targeting of selective electron scavengers: synthesis and biological analysis of hemigramicidin-TEMPO conjugates

Synthetic hemigramicidin S-peptidyl TEMPO conjugates are effectively delivered into cells and mitochondria, where they act as electron scavengers and exert protection against apoptosis. Our delivery approach is based on the use of specific structural signaling features recognizable by cells as mitochondria targeting sequences and offers considerable therapeutic anti-apoptotic potential.