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Zhou E.,Baoji Vocational Technology College | Zhang J.,Wuhan University | Lu Y.,Wuhan University | Dong C.,Wuhan University

The novel, recyclable C2-symmetric chiral shift reagents bearing both squaramide and indanol groups have been synthesized. These squaramides were examined as chiral shift reagents, and they have a wide recognition towards chiral carboxylate anions. The squaramide derived from (1S, 2R)-1-amino-2-indanol can distinguish the absolute configuration of the guest carboxylate anion. © ARKAT-USA, Inc. Source

Zhou E.,Baoji Vocational Technology College | Han X.,Wuhan University | Li Y.,Wuhan University | Guo C.,Wuhan University | Dong C.,Wuhan University

The novel synthesis of phenylselanylisochroman-1-ones was achieved by selenolactonization of styrene-typed carboxylic acids and phenylselenenyl chloride in the presence of 1,4-diazabicyclo[2.2.2]octane (DABCO). The reactions give excellent yields with high exo-selectivity. © 2015 The Japan Institute of Heterocyclic Chemistry. Source

Zheng P.,Changan University | Pan Z.,Baoji Vocational Technology College | Li H.,Changan University | Bai B.,CAS Northwest Institute of Plateau Biology | Guan W.,Changan University
Journal of Materials Science: Materials in Electronics

Effect of different type of organic or inorganic additions (formic acid, AgNO3, NaCl) on the photocatalytic reduction of copper and photooxidation of cyanide with illuminated TiO2@yeast was studied in this work together with the impact of solution pH values and contact time. The results indicated that pH values exhibited a great effect on the adsorption and photocatalytic performance of cyanide and copper because the surface charge of the TiO2@yeast and the existence form of cyanide and copper are highly pH dependent. The optimal adsorption and photo-oxidation of cyanide was observed at pH 2.0 while the best adsorptive and photocatalytic efficiency for copper was achieved at pH 5.0 within the studied range. The addition of formic acid increased the photo-reduction rate of copper and inhibited the photo-oxidation of cyanide. AgNO3, as electron acceptor, restrained the Cu(II) reduction from 75.0 to 30.5 %, whereas accelerate the photo-oxidation of cyanide. Besides, the presence of chloride ions retarded the removal efficiency of both cyanide and copper. The first-order kinetic model well described the experimental data. One possible mechanism of the effect of additives on copper and cyanide degradation was discussed. © 2015, Springer Science+Business Media New York. Source

Zhou E.,Baoji Vocational Technology College | Liu B.,Wuhan University | Dong C.,Wuhan University
Tetrahedron Asymmetry

A set of BINOL-quinine-squaramides were synthesized, and then used as organocatalysts to promote the catalytic enantioselective Michael addition reaction of 2-hydroxy-1,4-naphthoquinone to nitroalkenes with excellent yields and ees (up to 99% yield and 93% ee) at low catalyst loading (0.5 mol %). © 2013 Elsevier Ltd. All rights reserved. Source

Yang Y.-N.,Nantong University | Yang Y.-N.,Baoji Vocational Technology College | Wan W.-Q.,Clinic of the 61398 Army of PLA | Zhu D.-D.,Nantong University | And 3 more authors.
World Chinese Journal of Digestology

AIM: To observe the effect of lipopolysaccharide (LPS) on the expression of proteins associated with cell activation and apoptosis in human hepatic stellate cell line LX-2. METHODS: The expression of proliferating cell nuclear antigen (PCNA), Desmin and active Caspase 3 proteins was detected by Western blot in LX-2 cells treated with LPS. RESULTS: PCNA and Desmin expression in LX-2 cells could be regulated by LPS stimulation. No expression of active Caspase 3 was detected in LX-2 cells stimulated with low-concentration LPS or with LPS for a short period; however, the expression of active Caspase 3 could be up-regulated by stimulation with high-concentration LPS or with LPS for a long period. CONCLUSION: The proliferation, activation and apoptosis of LX-2 cells can be induced by LPS under appropriate conditions. © 2013 Baishideng Publishing Group Co., Limited. All rights reserved. Source

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