AutoCAD及Pro/E间图形交互的应用

介绍AutoCAD和Pro/E软件相互间数据交换的方法,利用AutoCAD工程图在Pro/E环境中进行三维建模,避免Pro/E建模时的草图重绘;同时将Pro/E工程图导入AutoCAD中进行编辑,符合一般工程设计的习惯.整个过程以DWG和DXF数据文件为桥梁,并以设计实例进行说明.该方法明显提高了设计效率.

Association of pro staglandin-endoperoxide synthase 2 (PTGS2) polymorphisms and Alzheimer's disease in Chinese

Cyclooxygenase-2 (COX-2, encoded by the gene prostaglandin-endoperoxide synthase 2, PTGS2) is a key enzyme in the conversion of arachidonic acid to prostaglandins. The prostaglandins produced by COX-2 are involved in inflammation and pain response in diff

Nd（i－PrO）_2Cl－AlEt_3均相二元催化剂异戊二烯聚合动力学──Ⅲ．AlEt_3的链转移作用

Ｎｄ（ｉ－ＰｒＯ）_２Ｃｌ－ＡｌＥｔ_３均相二元催化剂异戊二烯聚合动力学──Ⅲ．ＡｌＥｔ_３的链转移作用蔡小平，龚志，王佛松朱行洁，李秀华（中国科学院长春应用化学研究所长春１３００２２）（吉林化工集团公司研究院吉林）关键词异戊二烯，聚合动力学，均相催化...

STRUCTURE OF AN ERBIUM COORDINATION COMPOUND WITH L-PROLINE, ([ER(PRO)2(H2O)5]CL3)(N)

catena-Poly[{pentaaqua(L-proline-O)-erbium-mu-(L-proline-O:O')} trichloride], {[Er(C5H9-NO2)2(H2O)5]Cl3}n, M(r) = 594.0, monoclinic, P2(1), a = 8.294 (1), b = 10.981 (3), c = 11.934 (3) angstrom, beta = 107.04 (2)degrees, V = 1039.2 (4) angstrom3, Z = 2, D(x) = 1.90 g cm-3, lambda(Mo Kalpha) = 0.71069 angstrom, mu = 45.2 cm-1, F(000) = 586, T = 298 K, R = 0.0244 for 1711 unique reflections [I > 3 sigma(I(o))]. The crystal consists of one-dimensional chains of infinite length in which one L-proline ligand bridges two neighboring Er ions, the other L-proline ligand being monodentate.

Application of 2-(11H-benzo[a] carbazol-11-yl) Ethyl Carbonochloridate as a Pro-column Derivatization Reagent of Amino Acid by High Performance Liquid Chromatography with Fluorescence Detection

On a reversed phase Hypersil BDS C-18 (200 mm x 4. 6 mm, 5 mu m) column, 20 amino acids, which were derivatized using 2-(11H-benzo [a] carbazol-11-yl) ethyl carbonochloridate (BCEC-Cl) as pre-column derivatization reagent, were separated in conjunction with a gradient elution. Optimum derivatization was obtained by reacting of amino acids with BCEC-Cl at room temperature for 5 min in the presence of sodium borate catalyst in acetonitrile solvent. The fluorescence excitation and emission wavelengths were 279 nm and 380 nm respectively. The identification of amino acid derivatives from hydrolyzed bovine serum albumin and bee pollen was carried out by post-column mass spectrometry with electrospray ion source in positive ion mode. Linear correlation coefficients of the amino acid derivatives were > 0.9990, and detection limits (at signal to noise of 3:1) were 1.49 - 19.74 fmol for the labeled amino acids.