1,023 research outputs found
Bis[μ-4-amino-3,5-bisÂ(hydroxyÂmethÂyl)-1,2,4-triazole]bis{bisÂ[4-amino-3,5-bisÂ(hydroxyÂmethÂyl)-1,2,4-triazole]nickel(II)} tetraÂnitrate methanol disolvate
The title complex, [Ni2(C4H8N4O2)6](NO3)4·2CH4O, contains a centrosymmetric binuclear nickel(II) complex bridged by a pair of 4-amino-3,5-bisÂ(hydroxyÂmethÂyl)-1,2,4-triazole ligands. The separation between the NiII atoms is 3.962 (1) Å. The Ni atoms are in a slightly distorted octaÂhedral coordination. InterÂmolecular N—H⋯O, N—H⋯N and O—H⋯O hydrogen bonds connect the ligands, solvent molÂecules and nitrate ions
(E)-4-Bromo-N′-(2-hydrÂoxy-1-naphthylÂmethylÂene)benzohydrazide
The title compound, C18H13BrN2O2, was synthesized by the reaction of 2-hydrÂoxy-1-naphthaldehyde with 4-bromoÂbenzohydrazide. This Schiff base molÂecule has an E configuration about the C=N bond and is almost planar, the dihedral angle between the mean planes through the substituted benzene ring and the naphthyl system being 6.6 (2)°. There is an intraÂmolecular O—H⋯N hydrogen bond involving the naphthyl hydrÂoxy substituent and the N′ atom of the hydrazide group. In the crystal structure, molÂecules are linked through interÂmolecular N—-H⋯O hydrogen bonds to form chains extending along the b direction
The FEM-Prediction on tensile performance of woven membrane materials under uni and Bi-axial loads
In this study, the mechanical model of the woven PVC-coated membrane materials has been built.
By the FEM analysis, it was found out that when tensioned under uni-axial loads, the tensile modulus in the
warp and fill direction of woven membrane materials could be predicted nicely, especially after the revision
of the properties for the fiber materials. The effect of the tensile moduli of the fiber and the PVC coating
materials on the modulus of the woven membrane fabrics has been discussed. It could be consulted that with
the proper improvement of the modulus of the fiber materials in the fill direction, the discrepancy between
the modulus of woven membrane materials in the warp and fill direction could be reduced to a certain extent.
When it comes to the prediction of the modulus of the woven membrane materials under bi-axial loads, large
difference could be noticed between the predicted results and the experimental results, especially in warp
direction. This was due to the fact that the mechanical analysis model could only show the differences of the
geometry configuration between the warp and fill directions. However, the reinforcement of membrane
materials in warp direction during weaving and coating processes has been ignored
Adenovirus-mediated delivery of CALR and MAGE-A3 inhibits invasion and angiogenesis of glioblastoma cell line U87
<p>Abstract</p> <p>Background</p> <p>The management of patients with glioblastoma multiforme is difficult. Poor results have led to a search for novel therapeutic approaches. Gene therapy that could be both anti-invasive and antiangiogenic would be ideal. In this study, we constructed the recombinant adenoviral vector Ad-CALR/MAGE-A3 and evaluated its antitumor effects on glioblastoma in vitro and in vivo.</p> <p>Methods</p> <p>In this study, CALR and MAGE-A3 genes were delivered to the glioblastoma cell line U87, using adenovirus (Ad-CALR/MAGE-A3). U87 glioblastoma cells were transfected with Ad-green fluorescent protein to identify the multiplicity of infection. The expressions of CALR and MAGE-A3 were detected by PCR and Western blot. Cell proliferation was measured by MTT assay. Cell apoptosis was assessed by Annexin-V FITC/PI double staining flow cytometry. The invasive potential of U87 cells was determined by Matrigel invasion assay. Tube formation assay was used to detect the effects on angiogenesis of human umbilical vein endothelial cells. Protein expressions of PI3K/AKT, Erk1/2 and MMP-2/-9 in transfected cells were detected by Western blot. In vivo, the effects of Ad-CALR/MAGE-A3 on tumor growth and angiogenesis of U87 glioblastoma xenografts in nude mice were investigated.</p> <p>Results</p> <p>The expressions of CALR and MAGE-A3 in U87 cells resulted in the suppression of cell proliferation and invasion properties, and induced cell apoptosis. The Erk MAPK, PI3K/AKT pathways and expressions of MMP-2/-9 were inhibited in Ad-CALR/MAGE-A3-transfected cells. Outcomes of the tube formation assay confirmed the antiangiogenic effect of CALR. Moreover, in the in vivo model of glioblastoma, intratumoral injection of Ad-CALR/MAGE-A3 suppressed tumor growth and angiogenesis.</p> <p>Conclusion</p> <p>Although Ad-CALR/MAGE-A3 and Ad-CALR demonstrated antiangiogenic effects on U87 cells, the repression of invasion was significant only in Ad-CALR/MAGE-A3-treated cells. To our knowledge, this is the first description of a role for combined CALR and MAGE-A3 in the anti-invasion and antiangiogenesis of U87.</p
Fermi-arc supercurrent oscillations in Dirac semimetal Josephson junctions
One prominent hallmark of topological semimetals is the existence of unusual topological surface states known as Fermi arcs. Nevertheless, the Fermi-arc superconductivity remains elusive. Here, we report the critical current oscillations from surface Fermi arcs in Nb-Dirac semimetal Cd3As2-Nb Josephson junctions. The supercurrent from bulk states are suppressed under an in-plane magnetic field ~0.1 T, while the supercurrent from the topological surface states survives up to 0.5 T. Contrary to the minimum normal-state conductance, the Fermi-arc carried supercurrent shows a maximum critical value near the Dirac point, which is consistent with the fact that the Fermi arcs have maximum density of state at the Dirac point. Moreover, the critical current exhibits periodic oscillations with a parallel magnetic field, which is well understood by considering the in-plane orbital effect from the surface states. Our results suggest the Dirac semimetal combined with superconductivity should be promising for topological quantum devices.</p
Reducing electronic transport dimension to topological hinge states by increasing geometry size of Dirac semimetal Josephson junctions
The notion of topological phases has been extended to higher-order and has
been generalized to different dimensions. As a paradigm, Cd3As2 is predicted to
be a higher-order topological semimetal, possessing three-dimensional (3D) bulk
Dirac fermions, two-dimensional (2D) Fermi arcs, and one-dimensional (1D) hinge
states. These topological states have different characteristic length scales in
electronic transport, allowing to distinguish their properties when changing
sample size. Here, we report an anomalous dimensional reduction of supercurrent
transport by increasing the size of Dirac semimetal Cd3As2-based Josephson
junctions. An evolution of the supercurrent quantum interferences from a
standard Fraunhofer pattern to a superconducting quantum interference device
(SQUID)-like one is observed when the junction channel length is increased. The
SQUID-like interference pattern indicates the supercurrent flowing through the
1D hinges. The identification of 1D hinge states should be valuable for deeper
understanding the higher-order topological phase in a 3D Dirac semimetal
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