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Final report of CCQM-K129 'Measurement of Mole Fractions of Cu, In, Ga and Se in Cu(In,Ga)Se2 Films
Kim, K J,Kim, A S,Jang, J S,Suh, J K,Wirth, T,Unger, W,Hodoroaba, V-D,Araujo, J R,Archanjo, B S,Galhardo, C E,Damasceno, J,Achete, C A,Wang, H,Wang, M,Bennett, J,Simon, D,Kurokawa, A,Terauchi, S,Fujim BUREAU INTERNATIONAL DES POIDS ET MESURES 2016 METROLOGIA -BERLIN- Vol.53 No.1
Halofuginone and other febrifugine derivatives inhibit prolyl-tRNA synthetase
Keller, Tracy L,Zocco, Davide,Sundrud, Mark S,Hendrick, Margaret,Edenius, Maja,Yum, Jinah,Kim, Yeon-Jin,Lee, Hak-Kyo,Cortese, Joseph F,Wirth, Dyann F,Dignam, John David,Rao, Anjana,Yeo, Chang-Yeol,Maz Nature Publishing Group, a division of Macmillan P 2012 Nature chemical biology Vol.8 No.3
Febrifugine, the bioactive constituent of one of the 50 fundamental herbs of traditional Chinese medicine, has been characterized for its therapeutic activity, though its molecular target has remained unknown. Febrifugine derivatives have been used to treat malaria, cancer, fibrosis and inflammatory disease. We recently demonstrated that halofuginone (HF), a widely studied derivative of febrifugine, inhibits the development of T<SUB>H</SUB>17-driven autoimmunity in a mouse model of multiple sclerosis by activating the amino acid response (AAR) pathway. Here we show that HF binds glutamyl-prolyl-tRNA synthetase (EPRS), inhibiting prolyl-tRNA synthetase activity; this inhibition is reversed by the addition of exogenous proline or EPRS. We further show that inhibition of EPRS underlies the broad bioactivities of this family of natural product derivatives. This work both explains the molecular mechanism of a promising family of therapeutics and highlights the AAR pathway as an important drug target for promoting inflammatory resolution.
Bulk and surface electronic properties of SmB6 : A hard x-ray photoelectron spectroscopy study
Utsumi, Y.,Kasinathan, D.,Ko, K.-T.,Agrestini, S.,Haverkort, M. W.,Wirth, S.,Wu, Y-H.,Tsuei, K-D.,Kim, D-J.,Fisk, Z.,Tanaka, A.,Thalmeier, P.,Tjeng, L. H. American Physical Society 2017 Physical Review B Vol.96 No.15
Interplay of Structural Distortions, Dielectric Effects and Magnetic Order in Multiferroic GdMnO3
Mathias Doerr,Michael Loewenhaupt,Aditya A. Wagh,P. S. Anil Kumar,Suja Elizabeth,Sahana Roessler,Martin Rotter,Steffen Wirth 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.62 No.10
Multiferroic materials are characterized by simultaneous magnetic and ferroelectric ordering making them good candidates for magneto-electrical applications. We conducted thermal expansion and magnetostriction measurements in magnetic fields up to 14 T on perovskitic GdMnO3 by highresolution capacitive dilatometry in an effort to determine all longitudinal and transversal components of the magnetostriction tensor. Below the ordering temperature TN = 42 K, i.e., within the different complex (incommensurate or complex) antiferromagnetic phases, lattice distortions of up to 100 ppm have been found. Although no change of the lattice symmetry occurs, the measurements reveal strong magneto-structural phenomena, especially in the incommensurate sinusoidal antiferromagnetic phase. A strong anisotropy of the magnetoelastic properties was found, in good agreement with the type and propagation vector of the magnetic structure. We demonstrate that our capacitive dilatometry can detect lattice expansion effects and changes of the dielectric permittivity simultaneously because the sample is housed inside the capacitor. A separation of both effects is possible by shielding the sample. Dielectric transitions could be detected by this method and compared to the critical values of H and T in the magnetic phase diagram. Dielectric changes measured at 1 kHz excitation frequency are detected in GdMnO3 at about 180 K,and between 10 K and 25 K in the canted antiferromagnetic structure which is characterized by a complex magnetic order on both the Gd- and Mn-sites.
Thermal Conductivity of Barium Bismuthate at Low Temperatures
A. Henriques,D. M. N. Oliveira,M. Baksi,M. Naveed,W. H. Brito,J. Larrea-Jimenez,D. Kumah,S. Wirth,V. Martelli 한국물리학회 2023 새물리 Vol.73 No.12
The perovskite BaBiO₃ crystallizes in a cubic structure and undergoes structural transitions toward lower symmetry phases upon cooling. The two low-temperature monoclinic phases are insulating, and the origin of this unexpected non-metallic character has been under debate. Both monoclinic phases exhibit tilting and breathing distortions, which are connected with their insulating nature and may have important effects on phononic heat conductivity. Here, we report the first thermal conductivity measurement, κ(T), in pristine polycrystalline BaBiO₃ from 1.5 K to 310 K. At low and intermediate temperatures, we observe features reminiscent of a glass-like behavior, whereas at high-temperatures we find a downturn - typical of a crystalline solid. We compare our findings with available data of other recently investigated perovskite oxides displaying similar temperature dependence.