683 research outputs found
Exotic pairing in 1D spin-3/2 atomic gases with symmetry
Tuning interactions in the spin singlet and quintet channels of two colliding
atoms could change the symmetry of the one-dimensional spin-3/2 fermionic
systems of ultracold atoms while preserving the integrability. Here we find a
novel symmetry integrable point in thespin-3/2 Fermi gas and derive the
exact solution of the model using the Bethe ansatz. In contrast to the model
with and symmetries, the present model with symmetry
preserves spin singlet and quintet Cooper pairs in two sets of spin subspaces. We obtain full phase diagrams, including the
Fulde-Ferrel-Larkin-Ovchinnikov like pair correlations, spin excitations and
quantum criticality through the generalized Yang-Yang thermodynamic equations.
In particular, various correlation functions are calculated by using
finite-size corrections in the frame work of conformal field theory. Moreover,
within the local density approximation, we further find that spin singlet and
quintet pairs form subtle multiple shell structures in density profiles of the
trapped gas.Comment: 8 figures, 2 tables, 37 page
Gallic acid pyridine monosolvate
In the title compound (systenatic name: 3,4,5-trihydroxybenzoic acid pyridine monosolvate), C5H5N·C7H6O5, the gallic acid molecule is essentially planar (r.m.s deviation = 0.0766 Å for non-H atoms) and is linked to the pyridine molecule by an O—H⋯N hydrogen bond. An intramolecular O—H⋯O hydrogen bond occurs in the gallic acid molecule. The gallic acid and pyridine mean planes make a dihedral angle 12.6 (3)°. Intermolecular O—H⋯O and O—H⋯N hydrogen bonding involving the hydroxy and carboxyl groups and the pyridine molecule, and π–π interactions between inversion-related pyridines [centroid–centroid distance = 3.459 (6) Å] and between pyridine and benzene rings [centroid–centroid distance = 3.548 (6) Å], lead to a three-dimensional network in the crystal
Green tea polyphenol induces significant cell death in human lung cancer cells
Purpose: To investigate the dose–response relationship of green tea polyphenol in an animal model of lung cancer.Methods: The effects of epigallocatechin-3-gallate (EGCG) on the inhibition of xenograft tumor growth, the accumulation of 8-hydroxy-2'-deoxyguanosine (8-OHdG), and apoptosis based on 3-(4,5- dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide (MTT) assay were evaluated in non-small cell lung cancer (NSCLC) cell lines, namely, H1155, H661, and A427 (a human lung carcinoma-derived cell line). The dose-dependent effects of EGCG on H1155 xenograft tumor growth, as well as the levels of EGCG in plasma and tissue, were also determined in male nude mice.Results: EGCG inhibited the growth of NSCLC-derived cell lines (H1155) over a 45-day period. There was a significant reduction (57 %) in tumor weight in EGCG-fed (0.5 %) animals compared with the control group (p < 0.05). Linear regression analysis revealed a dose-dependent reduction in tumor size. MTT assay results revealed inhibition of H1155 cell growth (25 %, p < 0.05) after 24 h treatment with EGCG. The addition of superoxide dismutase (5 U/mL) and catalase (30 U/mL) reduced the inhibitory effect of EGCG. Mice administered 30 mg/kg EGCG via intraperitoneal injection exhibited the least amount of oxidative stress.Conclusion: The results demonstrate the concentration-dependent inhibitory effects of EGCG on lung cancer cells, including H1155 cells, both in vitro and in vivo. The induction of reactive oxygen species, oxidative DNA damage, and apoptosis were evident following EGCG treatment.Keywords: Green tea, Lung cancer, Catechins, Epigallocatechin-3-gallate, Oxidative stress, Oxidative DNA damag
Experimental and numerical simulation studies of the squeezing dynamics of the UBVT system with a hole-plug device
In this paper, a method is proposed to secure an autonomous underwater blasting vibration test (UBVT) system with plugs to deep-water rock, and its specific configuration concept and plugging principle are illustrated. Using the principle of statics, a mathematical model is established for the squeezing force in the process of pressing the hole-plug device (HPD) into holes in rocks. The tension-compression test is conducted on the plugs in round granite holes to obtain the axial pressure-displacement curves of the pressing process with the HPD spring parameter K, friction coefficient μ between the HPD and the rock-wall, and the dynamic contact friction attributes between the metallic HPD and the rock-wall of hole in granite. The axial pressure with such parameters as K, μ, and the squeezing velocity v, among others, and the four steps of the pressing process are numerically simulated. The relations of the characteristic squeezing force with K, μ, and v, as well as the mechanisms of these parameters that influence HPD usage and the sensitivity coefficient, are revealed. The findings of the present study provide references for setting the HPD configuration parameters and for formulating plug-specific construction methods
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