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Cellulose conversion to polyols on supported Ru catalysts in aqueous basic solution

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Science China Chemistry 2010年第7期53卷 1476-1480页

作者： DENG TianYin,SUN JiYing & LIU HaiChao beijing national laboratory for molecular sciences,State Key laboratory for Structural Chemistry of Stable and Unstable Species {2. Chemistry {3.,college of Chemistry and molecular engineering,peking university,beijing 100871,China beijing national {2. for {3. sciences State Key Laboratory for Structural Chemistry of Stable and Unstable Species Peking University Beijing China green Chemistry center College of Chemistry and Molecular Engineering Peking University Beijing China

It is of great significance and challenge to achieve direct conversion of cellulose to specific polyols,e.g.,ethylene glycol and propylene *** such selective conversion,a novel one-pot approach was studied by combination of alkaline hydrolysis and hydrogenation on supported Ru catalysts.A wide range of bases including solid bases,e.g.,Ca(OH)2.and La2.3.and phosphate buffers were examined in the cellulose reaction in water,and the cellulose conversions and polyol products depended largely on the basicity or pH values in the aqueous *** glycol,1,2.propanediol,and especially 1,2.5-pentanetriol were obtained with selectivities of 15%,14% and 2.%,respectively,at 3.% cellulose conversion at pH 8 in phosphate buffer *** preliminary results provide potentials for efficient conversion of cellulose to targeted polyols by using the advantages of bases.

关键词： cellulose polyols Ru catalysts solid bases aqueous basic solutions

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Luminescence resonance energy transfer based on β-NaYF_4:Yb,Er nanoparticles and TRITC dye

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Science China Chemistry 2009年第10期52卷 1590-1595页

作者： SUN LingDong, GU JianQin, ZHANG ShuZhuo, ZHANG YaWen & YAN ChunHua beijing national laboratory for molecular sciences, State Key Lab of Rare Earth Materials Chemistry and Applications & pku-HKU Joint Lab in Rare Earth Materials and Bioinorganic Chemistry, {2. of Chemistry and {3. engineering, peking university, beijing 100871, China beijing national {2. for {3. sciences State Key Lab of Rare Earth Materials Chemistry and Applications & PKU-HKU Joint Lab in Rare Earth Materials and Bioinorganic Chemistry College of Chemistry and Molecular Engineering Peking University Beijing China

β-NaYF4:Yb,Er nanoparticles (NPs) are one of the most efficient upconversion materials, which can convert near-infrared light to higher-energy light through multiple photon absorptions or energy transfer. In addition, they may be attractive alternative donors for luminescence resonance energy transfer (LRET) studies, because of their sharp absorption and emission profiles, high quantum yields, large anti-stokes shifts, long lifetime, low toxicity, and superior photo-stability. In principle, many problems of fluorescence resonance energy transfer (FRET), such as excitation of acceptors, emission overlaps between donors and acceptors, high background noise, potential toxicity, and instability, can be overcome using β-NaYF4:Yb,Er NPs as energy donors. Because the organic coating induced separation can significantly reduce the energy transfer efficiency and aqueous FRET system is difficult to be applied in devices, we demonstrate a novel NP-dye LRET system in solid state. The emission of the β-NaYF4:Yb,Er NPs at 53. nm overlaps with the absorption of the tetrametrylrhodarnine isothiocyante (TRITC), satisfying the requirement of LRET process. Since TRITC molecules are adsorbed on the β-NaYF4:Yb,Er NPs by an electrostatic interaction, the interaction distance is suitable for LRET without any further modulation. The resultant solid LRET system is ready for the further applications for devices.

关键词： upconversion emission β-NaYF4:Yb Er nanoparticles TRITC assembly luminescence resonance energy transfer (LRET)

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Overexpression of heat-shock protein 2. in rat heart myogenic cells confers protection against simulated ischemia/reperfusion injury

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Acta Pharmacologica Sinica 2005年第9期26卷 1076-1080页

作者： Yan-hui ZHU Xian WANG~2.Department of Physiology and Pathophysiology,Basic Medical college,Key laboratory of {2. Cardiovascular Biology,Ministry of Education,{3. university,beijing 100083.China Department of Physiology and Pathophysiology Basic Medical College Key Laboratory of Molecular Cardiovascular Biology Ministry of Education Peking University Beijing China

Aim:To explore whether overexpression of the small heat shock protein HSP2. inrat cardiomyocytes protects against simulated ischemia/reperfusion(SI/R)***:Recombinant adenovirus expressing HSP2. was used to infect rat H9c2.ardiomyocytes at high efficiency,as assessed by green fluorescent protein.H9c2.ells were subjected to SI/R stress;survival was estimated through assessment oflactate dehydrogenase and cell apoptosis through caspase-3.***:Overexpression of HSP2. decreased lactate dehydrogenase release by 2..5% andcaspase-3.activity by 58.8%.Pretreatment with the protein kinase C inhibitor Ro-3.-82.0(0.1 μmol/L)for 3. min before SI/R canceled the protective effect of *** selective mitochondrial K+awP channel inhibitor 5-hydroxydecanoate(100 μmol/L)had a similar ***,the non-selective K~+ATPchannel inhibitorglibenclamide(100 μmol/L)had no significant ***:These dataindicate that the protective effect of HSP2. in vitro is primarily due to reducednecrotic and apoptotic death of cardiomyocytes,possibly via the protein kinaseC/mitochondrial K~+ATP pathway.

关键词： reperfusion injury adenovirus apoptosis necrosis heat-shock proteins

Gene transfer of heat-shock protein 2. protects against ischemia/reperfusion injury in rat hearts

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Acta Pharmacologica Sinica 2005年第10期26卷 1193-1200页

作者： Yan-hui ZHU, Tie-min MA, Xian WANG~2.Department of Physiology and Pathophysiology, Basic Medical college, Key laboratory of {2. Cardiovascular Biology, Ministry of Education,{3., beijing 100083. China Department of Physiology and Pathophysiology Basic Medical College Key Laboratory of Molecular Cardiovascular Biology Ministry of Education Peking University Beijing China

Aim: To explore whether overexpression of HSP2. in the myocardium could protect against ischemia/reperfusion injury in rats. Methods: Rat hearts were injected with vector, recombinant adenovirus encoding green fluorescent protein(***) or recombinant adenovirus encoding wild-type HSP2. (***2.) in the left ventricle. Four days later, hearts were removed and expression of HSP2.was measured in the left ventricle. Subsets of animals in the vector-, ***-, ***2.-treated groups were subjected to 2.-rain ischemia and 12.-rainreperfusion. Myocardial injury was evaluated by infarct size and level of serumcardiac troponin T and creatine phosphokinase. Apoptosis of cardiomyocyteswas determined by TUNEL staining. Cardiac function was evaluated by hemodyamic indexes. Results: Infarct size and serum cardiac troponin T and creatinephosphokinase levels were significantly reduced in ***2.-treated hearts compared with vector-and ***-treated hearts. The ratio of TUNEL-positivecardiomyocytes to total number of cardiomyocytes in the ***2. group wassignificantly reduced as compared with the vector and *** groups. Left ventricular end systolic pressure, and maximal rate of pressure increase (+dp/dtmax)and decrease (-dp/dtmin) values were increased significantly, while left ventricularend diastolic pressure was decreased significantly in ***2.-treated heartscompared with vector- and ***-treated hearts. Conclusion: These data indicate that the cardioprotective effects of HSP2. may contribute to the reduction ofmyocardial necrosis and apoptosis in ischemia/reperfusion injury in rats.

关键词： reperfusion injury adenovirus apoptosis myocardial infarction heat-shock proteins

New Strategy to Construct Fused/Bridged/Spiro Carbocyclic Scaffolds Based on the Design of Novel 6-C Synthon Precursor

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New Strategy to Construct Fused/Bridged/Spiro Carbocyclic Sc...

第十六届全国金属有机化学学术讨论会

作者： Jia Liu,~(1,2. Xi Wang,~1 Chang-Liang Sun,~1 Bi-Jie Li,~1 Min Wang,~2.Zhang-Jie Shi~(*1,3. 1 beijing {2. {2. of {3. sciences(BNLMS) and Key {2. of Bioorganic Chemistry and {3. engineering of Ministry of Education,college of Chemistry and {3. engineering and {12. Chemistry center,{13. university,beijing 100871 and Department of Chemistry,2.university of Agriculture of China,beijing 100094 and 3.State Key {2. of Organometallic Chemistry,Shanghai Institute of Organic Chemistry,Chinese Academy of sciences,Shanghai 2.003.,China

＜正＞Fused/bridged/spiro carbocyclic ring scaffolds are one of most important motifs in natural and synthetic organic *** design a new 6-C synthon,which could be applied to construct complex poly-,spiro-and bridged systems through the simple sequential chemical transformations from acyclic precursor by a one-pot strategy from

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LiCl-Promoted Pd（Ⅱ）-Catalyzed ortho Carbonylation of N,N-Dimethylbenzylamines

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LiCl-Promoted Pd（Ⅱ）-Catalyzed ortho Carbonylation of N,N-...

第十六届全国金属有机化学学术讨论会

作者： Hu Li,~1 Gui-Xin Cai,~1 Zhang-Jie Shi~(*1,2. 1 beijing national {2. of {3. sciences(BNLMS),pku green Chemistry center and Key {2. of Bioorganic Chemistry and {3. engineering of Ministry of Education,college of Chemistry,{12.,beijing 100871,China 2.State Key {2. of Organometallic Chemistry,Chinese Academy of sciences,Shanghai 2.003.,China

＜正＞Palladium-catalyzed highly regioselective carbonylation of substituted N,N-dimethylbenzylamines was developed with the assistance of *** ortho-functionalized N,N-dimethylbenzylamine was further transformed into ...

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C-H Functionalization via Transition Metal Catalyzation

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C-H Functionalization via Transition Metal Catalyzation

中国化学会第二十五届学术年会

作者： Xiaobing Wan, Zhongxun Ma, Zhangjie Shi* beijing national laboratory for molecular sciences (BNLMS) and The Key laboratory of Bioorganic Chemistry and {2. {3. of Ministry of Education, college of Chemistry and green Chemistry center, peking university, beijing 100871, China and State Key laboratory of Organometallic Chemistry, Chinese Academy of sciences, Shanghai 2.003., China

Fe-Catalyzed Cross-Coupling of Aryl and Vinyl Carboxylates with Grignard Reagents under Mild Conditions

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Fe-Catalyzed Cross-Coupling of Aryl and Vinyl Carboxylates w...

第十六届全国金属有机化学学术讨论会

作者： Bi-Jie Li,Li Xu,and Zhang-Jie Shi~* beijing national {2. of {3. sciences(BNLMS) and Key {2. of Bioorganic Chemistry and {3. engineering of Ministry of Education,college of Chemistry and green Chemistry center,peking {12.,beijing 100080,China

＜正＞Previously,we have reported the nickel-catalyzed cross-coupling of aryl carboxylates with aryl boron and aryl zinc reagents,a class of novel transformation based on the C（aryl）-O bond *** reported herein an iron-catalyzed cross-coupling of aryl and vinyl carboxylates with Grignard reagents which proceeded with lower

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Characterization of an ethylene-inducible,calcium-dependent nuclease that is differentially expressed in cucumber flower development

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Characterization of an ethylene-inducible,calcium-dependent ...

2.11全国植物生物学研讨会

作者： Hai-Tao Gu~(1,2.,Dong-Hui Wang~(1,2.,Xia Li~1,Chao-Xing He~3.Zhi-Hong Xu~(1,2. and Shu-Nong Bai~(1,2. 1 pku-Yale Joint Research {2. of Agricultural and Plant molecular Biology,State Key {3. of Protein and Plant Gene Research,college of Life sciences,peking university,beijing,100871 China 2.The national {2. of Plant Gene Research(beijing),beijing,100871 China 3.Institute of Vegetables and Flowers,Chinese Academy of Agricultural sciences,beijing 100081 China

Production of unisexual flowers is an important mechanism that promotes crosspollination in *** previously identified primordial anther-specific DNA damage and organ-specific ethylene perception responsible for the arrest of stamen development in female flowers,but little is known about how the two processes are *** identify potential links between the two processes,we performed suppression subtractive hybridization(SSH) on cucumber(Cucumis sativus L.) stamens of male and female flowers at stage 6,with stamens at stage 5 of bisexual flowers as a *** the differentially expressed genes,we identified

关键词： CsCaN cucumber(Cucumis sativus L) DNA damage ethylene induction unisexual flowers