329 research outputs found
Bis[2-(1H-benzotriazol-1-yl)acetonitrile-κN 3]dibromidocopper(II)
In the title complex, [CuBr2(C8H6N4)2], the CuII atom is located on an inversion centre and the asymmetric unit comprises one half-molecule. The Cu atom is coordinated by two Br ions and two N atoms in approximately square-planar geometry. In the crystal structure, intermolecular C—H⋯Br hydrogen bonds and π–π interactions between benzotriazole rings (centroid–centroid distance = 3.651 Å) generate a three-dimensional network
Inelastic light scattering and the off-resonance approximation
Inelastic (Raman) light scattering intensities for a 42-electron quantum dot
under off-resonance conditions and in different spin and angular momentum
channels are computed in order to test whether final collective states become
the dominant peaks in the process. The results of the calculations set a limit
to the spread use of the off-resonant approximation for the theoretical
description of Raman processes
First Principles Calculation of Anomalous Hall Conductivity in Ferromagnetic bcc Fe
We perform a first principles calculation of the anomalous Hall effect in
ferromagnetic bcc Fe. Our theory identifies an intrinsic contribution to the
anomalous Hall conductivity and relates it to the k-space Berry phase of
occupied Bloch states. The theory is able to account for both dc and
magneto-optical Hall conductivities with no adjustable parameters.Comment: 4 pages, 6 figures, author list correcte
Collective Modes and Raman Scattering in One Dimensional Electron Systems
In this paper, we review recent development in the theory of resonant
inelastic light (Raman) scattering in one-dimensional electron systems. The
particular systems we have in mind are electron doped GaAs based semiconductor
quantum wire nanostructures, although the theory can be easily modified to
apply to other one-dimensional systems. We compare the traditional
conduction-band-based non-resonant theories with the full resonant theories
including the effects of interband transitions. We find that resonance is
essential in explaining the experimental data in which the single particle
excitations have finite spectral weights comparable to the collective charge
density excitations. Using several different theoretical models (Fermi liquid
model, Luttinger liquid model, and Hubbard model) and reasonable
approximations, we further demonstrate that the ubiquitously observed strong
single particle excitations in the experimental Raman spectra cannot be
explained by the spinless multi-spinon excitations in the Luttinger liquid
description. The observability of distinct Luttinger liquid features in the
Raman scattering spectroscopy is critically discussed.Comment: A review to be published in the special issue of Solid State
Communications on one-dimensional system
Semiquantitative theory of electronic Raman scattering from medium-size quantum dots
A consistent semiquantitative theoretical analysis of electronic Raman
scattering from many-electron quantum dots under resonance excitation
conditions has been performed. The theory is based on
random-phase-approximation-like wave functions, with the Coulomb interactions
treated exactly, and hole valence-band mixing accounted for within the
Kohn-Luttinger Hamiltonian framework. The widths of intermediate and final
states in the scattering process, although treated phenomenologically, play a
significant role in the calculations, particularly for well above band gap
excitation. The calculated polarized and unpolarized Raman spectra reveal a
great complexity of features and details when the incident light energy is
swept from below, through, and above the quantum dot band gap. Incoming and
outgoing resonances dramatically modify the Raman intensities of the single
particle, charge density, and spin density excitations. The theoretical results
are presented in detail and discussed with regard to experimental observations.Comment: Submitted to Phys. Rev.
Resonant Enhancement of Inelastic Light Scattering in the Fractional Quantum Hall Regime at
Strong resonant enhancements of inelastic light scattering from the long
wavelength inter-Landau level magnetoplasmon and the intra-Landau level spin
wave excitations are seen for the fractional quantum Hall state at .
The energies of the sharp peaks (FWHM ) in the profiles of
resonant enhancement of inelastic light scattering intensities coincide with
the energies of photoluminescence bands assigned to negatively charged exciton
recombination. To interpret the observed enhancement profiles, we propose
three-step light scattering mechanisms in which the intermediate resonant
transitions are to states with charged excitonic excitations.Comment: 5 pages, 5 figure
Pioglitazone Improves Mitochondrial Function in the Remnant Kidney and Protects against Renal Fibrosis in 5/6 Nephrectomized Rats
Pioglitazone is a type of peroxisome proliferator-activated receptor γ (PPARγ) agonist and has been demonstrated to be effective in chronic kidney diseases (CKD) treatment. However, the underlying mechanism involved in the renoprotection of pioglitazone has not been fully revealed. In the present study, the renoprotective mechanism of pioglitazone was investigated in 5/6 nephrectomized (Nx) rats and TGF-β1-exposed HK-2 cells. Pioglitazone attenuated renal injury and improved renal function, as examined by 24 h urinary protein, blood urea nitrogen and plasma creatinine in Nx rats. Renal fibrosis and enhanced expressions of profibrotic proteins TGF-β1, fibronectin and collagen I caused by Nx were significantly alleviated by pioglitazone. In addition, pioglitazone protected mitochondrial functions by stabilizing the mitochondrial membrane potential, inhibiting ROS generation, maintaining ATP production and the activities of complexes I and III, and preventing cytochrome C leakage from mitochondria. Pioglitazone also upregulated the expression levels of ATP synthase β, COX I and NDUFB8, which were downregulated in the kidney of Nx rats and TGF-β1-exposed HK-2 cells. Furthermore, pioglitazone increased fusion proteins Opa-1 and Mfn2 expressions and decreased fission protein Drp1 expression. The results imply that pioglitazone may exert the renoprotective effects through modulating mitochondrial electron transport chain and mitochondrial dynamics in CKD. Finally, these recoveries were completely or partly inhibited by GW9662, which suggests that these effects at least partly PPARγ dependent. This study provides evidence for the pharmacological mechanism of pioglitazone in the treatment of CKD
Flexible and Asymmetric Ligand in Constructing Coordinated Complexes: Synthesis, Crystal Structures and Fluorescent Characterization
Flexible and asymmetric ligand L [L = 1-((pyridin-3-yl)methyl)-1H-benzotriazole], is used as a basic backbone to construct complicated metal-organic frameworks. Two new polymers, namely, [Ag2(L)2(NO3)2]n (1) and [Ag(L)(ClO4)]n (2), were synthesized and characterized by X-ray structure analysis and fluorescent spectroscopy. The complex 1 gives an “S” type double helical conformation, whereas complex 2 exhibits a 1D zigzag configuration. Different anions affect the silver coordination geometry and crystal packing topology
MicroRNA-122 can be measured in capillary blood which facilitates point-of-care testing for drug-induced liver injury
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