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Search Results: 1 - 10 of 61095 matches for " DONG Zhi-Fang "
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Serum pepsinogen II is a better diagnostic marker in gastric cancer
Xue-Yuan Cao,Zhi-Fang Jia,Mei-Shan Jin,Dong-Hui Cao
World Journal of Gastroenterology , 2012, DOI: 10.3748/wjg.v18.i48.7357
Abstract: AIM: To investigate screening makers for gastric cancer, we assessed the association between gastric cancer and serum pepsinogens (PGs). METHODS: The subjects comprised 450 patients with gastric cancer, 111 individuals with gastric atrophy, and 961 healthy controls. Serum anti-Helicobacter pylori (H. pylori) immunoglobulin G (IgG), PGIand PG II were detected by enzyme-linked immunosorbent assay. Gastric atrophy and gastric cancer were diagnosed by endoscopy and histopathological examinations. Odds ratios and 95%CIs were calculated using multivariate logistic regression. RESULTS: Rates of H. pylori infection remained high in Northeastern China. Rates of H. pylori IgG positivity were greater in the gastric cancer and gastric atrophy groups compared to the control group (69.1% and 75.7% vs 49.7%, P < 0.001). Higher levels of PG II (15.9 μg/L and 13.9 μg/L vs 11.5 μg/L, P < 0.001) and lower PGI/PG II ratio (5.4 and 4.6 vs 8.4, P < 0.001) were found in patients with gastric cancer or gastric atrophy compared to healthy controls, whereas no correlation was found between the plasma PGIconcentration and risk of gastric cancer (P = 0.537). In addition, multivariate logistic analysis indicated that H. pylori infection and atrophic gastritis were independent risk factors for gastric cancer. Lower plasma PGI/PG II ratio was associated with higher risks of atrophy and gastric cancer. Furthermore, plasma PG II level significantly correlated with H. pylori-infected gastric cancer. CONCLUSION: Serum PG II concentration and PGI/PG II ratio are potential biomarkers for H. pylori-infected gastric disease. PG II is independently associated with risk of gastric cancer.
2-(3-Methoxyphenoxy)benzoic acid
Zhi-Fang Zhang
Acta Crystallographica Section E , 2011, DOI: 10.1107/s1600536811011019
Abstract: In the crystal structure of the title compound, C14H12O4, the molecules form classical O—H...O hydrogen-bonded carboxylic acid dimers. These dimers are linked by C—H...pi; interactions into a three-dimensional network. The benzene rings are oriented at a dihedral angle of 69.6 (3)°.
Bis(μ2-2-chlorobenzoato-κ2O:O′)bis[(2-chlorobenzoato-κO)(1,10-phenanthroline-κ2N:N′)copper(II)] dihydrate
Zhi-Fang Zhang
Acta Crystallographica Section E , 2011, DOI: 10.1107/s1600536811029709
Abstract: In the title compound, [Cu2(C7H4ClO2)4(C12H8N2)2]·2H2O, the two crystallographically independent dinuclear complex molecules, A and B, have different Cu...Cu separations, viz. 3.286 (1) in A and 3.451 (1) in B. Both independent molecules reside on inversion centres, so the asymmetric unit contains a half-molecule each of A and B and two water molecules. Each Cu atom has a square-pyramidal environment, being coordinated by two O atoms from two bridging 2-chlorobenzoate ligands, one O atom from a monodentate 2-chlorobenzoate ligand and two N atoms from a 1,10-phenanthroline ligand. The water molecules can also be considered as coordinating ligands, which complete the coordination geometry up to distorted octahedral with elongated Cu—O distances, viz. 3.024 (3) in A and 2.917 (3) in B. In the crystal, weak intermolecular C—H...O interactions contribute to the consolidation of the crystal packing.
Diethyl 2-{[(4-methoxy-3-pyridyl)amino]methylidene}malonate
Zhi-Fang Zhang
Acta Crystallographica Section E , 2011, DOI: 10.1107/s1600536811026353
Abstract: In the title molecule, C14H8N2O5, the amino group is involved in the formation an intramolecular N—H...O hydrogen bond. In the crystal, weak intermolecular C—H...O and C—H...N hydrogen bonds link the molecules into ribbons along the b axis.
2-(m-Tolyloxy)benzoic acid
Zhi-Fang Zhang
Acta Crystallographica Section E , 2011, DOI: 10.1107/s1600536811026171
Abstract: In the crystal structure of the title compound, C14H12O3, the molecules form classical O—H...O hydrogen-bonded carboxylic acid dimers. The dihedral angle between the two rings is 80.9 (3)°.
(E)-3-(4-Fluorophenyl)-1-(2-nitrophenyl)prop-2-en-1-one
Zhi-fang Pan
Acta Crystallographica Section E , 2010, DOI: 10.1107/s160053681001809x
Abstract: The title compound, C15H10FNO3, was prepared from 2-nitroacetphenone and 4-fluorobenzaldehyde by an Aldol condensation reaction. The dihedral angle formed by the two benzene rings is 67.37 (2)°. The crystal structure is stabilized by weak intermolecular C—H...O and C—H...F hydrogen bonds.
cis-Bis(2,2′-bipyridine-κ2N,N′)dichloridoiron(III) perchlorate
Zhi-Fang Zhang
Acta Crystallographica Section E , 2011, DOI: 10.1107/s1600536811016035
Abstract: In the crystal structure of the title compound, [FeCl2(C10H8N2)2]ClO4, the coordination around the FeIII atom is approximately octahedral. The equatorial positions are occupied by two N atoms from two 2,2′-bipyridyl ligands [Fe—N = 2.121 (5) and 2.147 (5) ] and two Cl atoms [Fe—Cl = 2.220 (2) and 2.2074 (18) ]. Weak intermolecular C—H...O and C—H...Cl hydrogen bonds and C—H...π interactions consolidate the crystal packing.
3-(2H-Benzotriazol-2-yl)-1-(4-fluorophenyl)propan-1-one
Zhi-Fang Pan
Acta Crystallographica Section E , 2010, DOI: 10.1107/s1600536810013917
Abstract: In the title compound, C15H12FN3O, the benzotriazole ring system is essentially planar, with a maximum deviation from the least-squares plane of 0.016 (3) . The dihedral angle between this ring system and the fluoro-substituted benzene ring is 67.97 (2)°. The crystal structure is stabilized by weak intermolecular C—H...N interactions.
Sub-natural linewidth of the probe absorption spectrum in a cold Cs atom molecule system

Feng Zhi-Fang,Li Wei-Dong,Xiao Lian-Tuan,Jia Suo-Tang,

中国物理 B , 2009,
Abstract:
Influence of line defects on focusing in a two-dimensional photonic-crystal flat lens

Feng Zhi-Fang,

中国物理 B , 2010,
Abstract: We investigate in detail the influence of line defects on focusing of electromagnetic waves in a two-dimensional photonic-crystal flat lens. Through simulations, we find that a focusing can always be observed when a line defect in the lens is introduced along the light transmission direction and the width of the line defect is less than $\lambda /2$. However, there appear two focusings when the width of the line defect is more than $\lambda /2$. When the line defect is introduced along the direction perpendicular to the transmission, there is always one focusing.
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