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| 1 | Effects of support pore size on new Cs_(2.5)H_(0.5)PW_(12)O_(40)/SiO_2 catalysts for the ring-opening polymerization of tetrahydrofuran显示文摘Mesoporous silica supported Cs_(2.5)H_(0.5)PW_(12)O_(40) catalysts were prepared by impregnation method,and several silica supports with different pore size were utilized.N_2 adsorption,XRD and ICP-AES techniques were utilized to characterize the silica supports and catalysts.XRD results showed that the dispersion of Cs_(2.5)H_(0.5)PW_(12) was better for the silica support with larger pore size.The catalytic activity results showed that the pore size played important role on the catalyst activity and the molecular weight of PTHF. When Cs_(2.5)H_(0.5)PW_(12)O_(40) was dispersed on larger pore size silica support,the catalysts showed good performances for the synthesis of PTHF.The molecular weight of PTHF product on the sample in which Cs_(2.5)H_(0.5)PW_(12)O_(40) was dispersed on larger pore support was higher than that on the catalyst with smaller pore support.The leaching amounts of the active components for the supported Cs_(2.5)H_(0.5)PW_(12)O_(40) catalysts were much lower.After five reaction cycles,there were still good activities and stabilities for the supported Cs_(2.5)H_(0.5)PW_(12)O_(40) catalysts with larger pore silica supports.These results were much better than those of the supported heteropolyacid H_3PW_(12)O_(40) catalyst. | Xue Mei Liao Wei Chu Yang Li FU Dong Zhoua Shi Zhong Luo | 2009 | Chinese Chemical Letters2009，20，3： | 2 |
| 2 | Crystal structure of a bacterial homolog to human lysosomal transporter,spinster显示文摘Lysosomes break down various biomolecules and spinster is one of the major efflux carriers removing degradation products from lysosomal lumen to keep it in healthy size and proper function.Although it is well established that a dysfunctional spinster will cause enlarged lysosomes and in turn lead to developmental defects and abnormal behavior in animals,little was known about the transportation mechanism and substrate specificity of spinster.Here,we report a crystal structure of spinster homolog from Hyphomonas neptunium,HnSPNS,in its inward-facing conformation with and without substrate bound.HnSPNS is crystallized in a monomer and a substrate-binding cavity was formed in the center of its transmembrane helices.A blob of electron density corresponding to its substrate was found in the cavity near a conserved residue,R42,which is locked in position by the interactions with conserved residues E129 and R122.Our results suggest that human spinster serves as a transporter translocating negativelycharged lipophilic small molecules and E129 might serve as a switch to control the conformational change via its protonation-deprotonation cycle. | Fu Zhoua Deqiang Yao Bing Rao Li Zhang Wang Nie Yan Zou Jie Zhao Yu Cao | 2019 | Science Bulletin2019，64，18： | 2 |
| 3 | STUDIES ON STEROIDAL PLANT GROWTH REGULATOR 24. STEREOCONTROLLED CONSTRUCTION OF THE SIDE CHAIN OF BRASSINOLIDE AND HOMOBRASSINOLIDE VIA A TANDEM VICINAL DIALKYLATION OF PYRANONE MOIETY显示文摘A stereocontrolled construction of the side chain of brassinclide and homobrassinolide has been achieved via the tandem vicinal dialkylation of the pyranone moiety as a key step. | Wei Shan ZHOUa* Li Qiang SUNb Xin Fu PANb a. Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, 345 LingLing Lu, 200032 b. Department of Chemistry Lanzhou University, Lanzhou, 730000 | 1991 | Chinese Chemical Letters1991，2，12： | 1 |
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