Importance of Correlation Effects on Magnetic Anisotropy in Fe and Ni

We calculate magnetic anisotropy energy of Fe and Ni by taking into account the effects of strong electronic correlations, spin-orbit coupling, and non-collinearity of intra-atomic magnetization. The LDA+U method is used and its equivalence to dynamical mean-field theory in the static limit is emphasized. Both experimental magnitude of MAE and direction of magnetization are predicted correctly near U=4 eV for Ni and U=3.5 eV for Fe. Correlations modify one-electron spectra which are now in better agreement with experiments.Comment: 4 pages, 2 figure

Acute-phase proteins before cerebral ischemia in stroke-prone rats : identification by proteomic

BACKGROUND AND PURPOSE: A high degree of proteinuria has been reported in stroke-prone spontaneously hypertensive rats (SHRSP). We studied the effect of salt loading on the detailed protein pattern of serum and urine in 3 rat strains: Wistar-Kyoto, spontaneously hypertensive rats, and SHRSP, an inbred animal model for a complex form of cerebrovascular disorder resembling the human disease. METHODS: Rats were given a permissive diet and received 1% NaCl in drinking water. The protein pattern in body fluids was assessed over time by 2-dimensional electrophoretic analysis. Brain alterations were monitored by MRI and histology. RESULTS: Several proteins were excreted in urine after weeks of treatment and in advance of stroke: transferrin, hemopexin, albumin, alpha(2)-HS-glycoprotein, kallikrein-binding protein, alpha(1)-antitrypsin, Gc-globulin, and transthyretin. Markers of an inflammatory response, including very high levels of thiostatin, were detected in the serum of SHRSP at least 4 weeks before a stroke occurred. CONCLUSIONS: In SHRSP subjected to salt loading, an atypical inflammatory condition and widespread alterations of vascular permeability developed before the appearance of anomalous features in the brain detected by MRI. Urinary concentrations of each of the excreted serum proteins correlated positively with time before stroke occurred

Theoretical considerations for the application of competitive polymerase chain reaction to the quantitation of a low abundance mRNA : estrogen receptor

The necessary theoretical considerations for the development of a correct quantitative analysis of a low abundance messenger RNA (mRNA), estrogen receptor mRNA, by competitive polymerase chain reaction (PCR) are presented together with a series of experimental data. When compared to other methodologies currently utilized for RNA quantitation, this PCR application proved to be a very reliable, rapid and sensitive method. Furthermore, the PCR-based quantitative method described is of particular interest since it does not require the use of radiolabeled compounds

BEHAVIOUR OF Nb-Ti-Ta WIRE IN NON-STATIONARY CONDITIONS

Les pertes d'énergie en courant alternatif et les valeurs critiques du courant ont été mesurées sur un échantillon du NbTiTa, précédemment étudié en conditions stationnaires. L'ensemble des résultats montre que cet alliage peut en principe être utilisé aussi bien que l'alliage NbTi dans des conditions de champ variable.Critical ac currents and losses are measured on a NbTiTa wire previously characterized in dc conditions. The whole of the results show that in principle this alloy could work at least as well as the NbTi one when time variable conditions are involved