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| 1 | Investigation of tribological performances of MCMB显示文摘Tribological properties of Meso-carbon Microbeads (MCMB) powders as a special addi-tive in pentaerythritol were investigated on an Optimal SRV tribotester at 300℃. The coarsely dis-persed lubricant system demonstrates fine lubricious effectiveness at the operation temperature.The friction coefficient dropped from 0.2 to circa 0.12 in the presence of MCMB in pentaerythritolfor the No.45 carbon steel tribomate. Raman spectroscopy analysis indicated the partial transfor-mation of MCMB into increased ordered structures that contributed to the lowering of friction. | CUI Xiaohao LI Shenghua SONG Huaihe JIN Yuansheng FU Honglan 1. National Tribology Laboratory, Tsinghua University, Beijing 100084, China 2. Institute of Carbon Fibers & Composites, Beijing University of Chemical Technology, Beijing 100029, China 3. Department of Biology, Peking University, Beijing 100871, China | 2001 | Science China Mathematics2001，44，S1： | 6 |
| 2 | Bioreducible unimolecular micelles based on amphiphilic multiarm hyperbranched copolymers for triggered drug release显示文摘A novel type of bioreducible amphiphilic multiarm hyperbranched copolymer (H40-star-PLA-SS-PEG) based on Boltorn H40 core,poly(L-lactide) (PLA) inner-shell,and poly(ethylene glycol) (PEG) outer-shell with disulfide-linkages between the hydrophobic and hydrophilic moieties was developed as unimolecular micelles for controlled drug release triggered by reduction.The obtained H40-star-PLA-SS-PEG was characterized in detail by nuclear magnetic resonance (NMR),Fourier transform infrared (FTIR),gel permeation chromatography (GPC),differential scanning calorimeter (DSC),and thermal gravimetric analysis (TGA).Transmission electron microscopy (TEM) and dynamic light scattering (DLS) analyses suggested that H40-star-PLA-SS-PEG formed stable unimolecular micelles in aqueous solution with an average diameter of 19 nm.Interestingly,these micelles aggregated into large particles rapidly in response to 10 mM dithiothreitol (DTT),most likely due to shedding of the hydrophilic PEG outer-shell through reductive cleavage of the disulfide bonds.As a hydrophobic anticancer model drug,doxorubicin (DOX) was encapsulated into these reductive unimolecular micelles.In vitro release studies revealed that under the reduction-stimulus,the detachment of PEG outer-shell in DOX-loaded micelles resulted in a rapid drug release.Flow cytometry and confocal laser scanning microscopy (CLSM) measurements indicated that these DOX-loaded micelles were easily internalized by living cells.Methyl tetrazolium (MTT) assay demonstrated a markedly enhanced drug efficacy of DOX-loaded H40-star-PLA-SS-PEG micelles as compared to free DOX.All of these results show that these bioreducible unimolecular micelles are promising carriers for the triggered intracellular delivery of hydrophobic anticancer drugs. | PANG Yan 1,LIU JinYao 1,SU Yue 1,ZHU BangShang 2,HUANG Wei 1,ZHOU YongFeng 1,ZHU XinYuan 1,2 & YAN DeYue 1 1 School of Chemistry and Chemical Engineering,State Key Laboratory of Metal Matrix Composites,Shanghai Jiao Tong University,Shanghai 200240,China 2 Instrumental Analysis Center,Shanghai Jiao Tong University,Shanghai 200240,China | 2010 | Science China Chemistry2010，53，12： | 3 |
| 3 | The Cosmic Dust in Suzhou Granite:Ablated Products of a Cometary Explosion | Hu Zhong-wei,Wang Er-kang,Wan Yu-qiuDepartement of Astronomy,Nanjing University,Nanjing 210093,China Department of Earth Sdence,Nanjing University,Nanjing 210093,China Cosmic dust has been collected in large number from deap-sea sediments,Greenland ice deposits,the stratosphere and space,of cosmic dust,some are the unmelted micrometeorite,and most are the ablated products of me-teoroids in the atmosphere.Cosmic dusts were recovered from two sites of the 1908 Tunguska explosion and the 1965 Revelstoks explosion Since 1987,a large number of microspherules have been extracted from Suzhou granite of China Their suface and section structures,mineral and chemical composition show that these microspherules are of the ablated cosmic dust.The microspherules occurred in the inner contact complex intrusion.It suggests that the microspherules may be products of the same event and were aggergated in some strata and then captured by the emplacement of granitic magma.Although the microspherules are similare to other ablated cosmic dusts,there are some diferences.Our calculated results of cometary motion through the atmosphere and explosion show that the microspherules may be the ablated dust of a comet with mass above 1015g at its explosion near the ground. | 1996 | 紫金山天文台台刊1996，15，3： | 2 |
| 4 | High norbornene incorporation in ethylene-norbornene copolymerization with a bis(α-alkyloxoimine) titanium-MAO catalyst显示文摘A novel bis(α-alkyloxoimine) titanium(IV) complex was synthesized and used as a catalyst precursor to catalyze homo-and copolymerization of ethylene and norbornene.The titanium complex activated with methylalumoxane exhibits good activities for the homopolymerizations of ethylene and norbornene under high temperature to produce high-molecular-weight linear polyethylene and vinyl-type polynorbornene,respectively.Ethylene-norbornene copolymers with high molecular weight can also be produced by this catalyst.The incorporation of norbornene from 0 to 76 mol% in the copolymers can be controlled by varying the charged norbornene.13C NMR analyses show that the microstructures of the ethylene-norbornene copolymers with low norbornene incorporation are predominantly alternated and isolated norbornene units,while those with high norbornene incorporation are random polymers containing long norbornene sequences. | GAO HaiYang1,2,HU Hao1 & WU Qing1,2 1Institute of Polymer Science,School of Chemistry and Chemical Engineering,Sun Yat-Sen (Zhongshan) University,Guangzhou 510275,China 2Key Laboratory for Polymeric Composite and Functional Materials of Ministry of Education Sun Yat-Sen (Zhongshan) University,Guangzhou 510275,China | 2010 | Science China Chemistry2010，53，8： | 2 |
| 5 | hirtum (Link) Ietswaart in Bulgaria显示文摘 | Konakchiev A Genova E Couladis M Chemical composition of the essential oil of Origanum vulgare ssp | 2004 | Comptes rendus de 1'' Academie bulgare des Sci2004，57，11： | 1 |
| 6 | leaves and flowers显示文摘 | CHAMORROA E R BALLERINIB G SEQ RAA A F Chemical composition of essential oil from Tagetes minuta L | 2008 | Journal of the Argentine Chemical Society2008，96，12： | 1 |
| 7 | 5 aerosol in the urban area of Fuzhou, China显示文摘 | Seasonal variations and chemical compositions of PM2 | | Atmospheric Research0，104，： | 1 |
| 8 | 2 Fuel Oil: Growth Responses of the Brown Alga Fucus vesiculosus显示文摘 | Michele L W Paulette E Effects of Bioremediation on Toxicity and Chemical Composition of No | 2000 | Marine Pollution Bulletin2000，40，2： | 1 |
| 9 | Changes in physical properties and microstructure of duck egg as influenced by salting显示文摘 | Kaewmanee T Benjakul S chemical composition Visessanguan W | 2009 | Food Chemistry2009，112，3： | 1 |
| 10 | STUDY ON THE MORPHOLOGY OF POLYVINYL CHLORIDE/POLYSTYRENE BLENDS BY ELECTRON MICROPROBE ANALYSIS显示文摘The morphology of polyvinyl chloride/polystyrene (PVC/PS) blend samples with different mass ratios, preparedby means of solution casting and melt mixing, have been successfully examined by electron microprobe analysis (EMP). Thisexperiment was performed in a scanning electron microscope attached to an energy dispersive X-ray analyzer. Differentialscanning calorimetry was also used to investigate the phase separation of the blends. The results show that PVC and PS areincompatible and the blends have sea-islands phase structures. Blends prepared via melt mixing have finer phase-dispersionthan those prepared via solution casting. | Zheng-ping Fang Gen-lin Wang Guo-ping Cai Cheng-wei Xu Jie Qian Institute of Polymer Composites, Zhejiang University, Hangzhou 310027, China College of Chemical Engineering, Zhejiang University of Technology, Hangzhou 310014, China | 2000 | Chinese Journal of Polymer Science2000，18，5： | 0 |
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