Moscow State University

About: Moscow State University is a education organization based out in Moscow, Russia. It is known for research contribution in the topics: Laser & Population. The organization has 66747 authors who have published 123358 publications receiving 1753995 citations. The organization is also known as: MSU & Lomonosov Moscow State University.

Disorders of "simultaneous perception" in a case of bilateral occipito-parietal brain injury

Abstract: I. INTRODUCTION IN reports of the optico-gnostic disorders arising from cerebral lesions, a restriction of the field of visual perception to single objects or their parts has been repeatedly described. It was mentioned in some of the earliest descriptions of visual agnosia (Wilbrandt, 1887; Lissauer, 1890) .and subsequently analysed with particular thoroughness by Balint (1909). In Balint's case, the patient was said to have been able to see only one object at a time, irrespective of its size. Holmes later described very similar disorders in cases of bilateral posterior parietal gunshot wound (Holmes, 1919; Holmes and Horrax, 1919). Although placing the main emphasis upon loss of visual orientation, Holmes referred to a constriction of visual attention as an important element in the syndrome. In more recent years, Balint's syndrome has been reinvestigated by Hecaen and Ajuriaguerra (1954), who likewise stress the defect of attention and the bilaterality of the responsible lesion. Defects of visual synthesis of a somewhat less pronounced character have also been described in the literature (Gelb and Goldstein, 1920; Wolpert, 1924; Head, 1926; Paterson and Zangwill, 1944). In these cases, the lesion is commonly unilateral, orientation in space is usually preserved, and scanning movements of the eyes less obviously disturbed. But there may be gross incapacity to combine the elements of the perceptual display into a coherent and integrated whole. To this type of deficit the term "simultanagnosia" is commonly applied (Wolpert, 1924). It is clear that the limited and fragmentary character of perception so often associated with occipito-parietal lesions cannot be wholly accounted for in terms of visual field defects. Restriction of visual perception to individual objects or their parts has been described in the absence of significant field defects; conversely, perception may be more or less adequate in spite of extensive scotomata. This is not, however, to say that the perceptual deficit does not call for physiological explanation;

Supersymmetry parameter analysis : SPA convention and project

Abstract: High-precision analyses of supersymmetry parameters aim at reconstructing the fundamental supersymmetric theory and its breaking mechanism. A well defined theoretical framework is needed when higher-order corrections are included. We propose such a scheme, Supersymmetry Parameter Analysis SPA, based on a consistent set of conventions and input parameters. A repository for computer programs is provided which connect parameters in different schemes and relate the Lagrangian parameters to physical observables at LHC and high energy e(+)e(-) linear collider experiments, i.e., masses, mixings, decay widths and production cross sections for supersymmetric particles. In addition, programs for calculating high-precision low energy observables, the density of cold dark matter (CDM) in the universe as well as the cross sections for CDM search experiments are included. The SPA scheme still requires extended efforts on both the theoretical and experimental side before data can be evaluated in the future at the level of the desired precision. We take here an initial step of testing the SPA scheme by applying the techniques involved to a specific supersymmetry reference point.

Second Order Equations of Elliptic and Parabolic Type

Abstract: Elliptic equations in nondivergence form Elliptic equations in divergence form Parabolic equations Appendix Bibliography Index.

Coexistence of superconductivity and magnetism theoretical predictions and experimental results

Abstract: Superconductivity and ferromagnetic ordering are two antagonistic types of ordering, and their mutual influence leads to many interesting phenomena which have been studied recently in ternary compounds. Theoretical analysis of ferromagnetic materials which are type II superconductors near the superconducting transition point T cl shows that they become type I near the magnetic transition point T M. The proposed theory constructed for the case T M « T cl predicts the formation of a transverse domain-like (DS phase) magnetic structure below T M. The electronic spectrum appears to be gapless in the DS phase of clean compounds with a re-entrant transition. The change from type II to type I behaviour as the sample is cooled to T M has been observed in ErRh4B4. Experimental data for HoMo6S8, HoMo6Se8 and ErRh4B4 give evidence for the coexistence of super-conductivity and non-uniform magnetic ordering below T M. Mutual influence of superconducting and magnetic orderings is also studied.

RhoD regulates endosome dynamics through Diaphanous-related Formin and Src tyrosine kinase.

Abstract: Early endosomes move bidirectionally between the cell periphery and the interior through a mechanism regulated by the low molecular weight GTPase RhoD. Here, we identify a novel splice variant of human Diaphanous, hDia2C, which specifically binds to RhoD and is recruited onto early endosomes. Expression of RhoD and hDia2C induces a striking alignment of early endosomes along actin filaments and reduces their motility. This activity depends on the membrane recruitment and activation of c-Src kinase, thus uncovering a new role in endosome function. Our results define a novel signal transduction pathway, in which hDia2C and c-Src are sequentially activated by RhoD to regulate the motility of early endosomes through interactions with the actin cytoskeleton.