Theoretical Study on the Structures and Stability of Isomers and Complex of[Si,C,O,O] Sytem

A detailed singlet potential energy surface(PES) of [Si,C,O,O] system including a van der Waals (vdW) comples SiO……CO2,eight isomers,and twelve transiton states is investigated by MP2 and QCISD(T) (single-point)methods.At the final QCISD(T)/6-311 G(2df)//MP2/6-311G(d) level with zero-point energy included,the complex SiO……CO is found to be thermodynamically and kinetically the most stable species.Although eight ismoers are located as local energy minima,they are rather unstable toward isomerization to the dissociation fragments or comples.For the reaction of silocon atoms with carbon dioxide,two competitive reaction channels are found,and the primary pathway,which leads to the products of SiO and CO fragments,is the direct oxygen-abstraction process from carbon dioxide by silicon atom with a41.16 kJ/mol reaction barrier height.Our predications are in good agreement with previous experimental and theoretical studies.     

固相微萃取技术与环境样品前处理

固相微萃取技术是80 年代末发展起来的一项新型的无溶剂化环境样品前处理技术, 它主要与气相色谱和高效液相色谱联用, 能快速和有效地分析环境样品中的痕量有机污染物。技术从出现至今主要在萃取装置(萃取纤维涂层)、萃取方式及后序分析仪器上有较大的发展和变化, 这使得技术的应用范围不断拓宽。通过对现有文献的总结, 本文还提出了固相微萃取技术今后的发展趋势。     

Preparation of Europium Induced Conformation—specific anti—calmodulin Monoclonal Antibody

Monoclonal antibody technique was employed to detect the conformational difference of CaM induced by metal ions. A trivalent europium ion induced conformation-specific anti-calmodulin monoclonal antibody was successfully prepared with europium-saturated calmodulin as antigen.     

液相色谱-串联质谱法同时检测饲料中多种抗氧化剂

饲料中添加抗氧化剂能够阻止或延缓饲料中某些营养物质氧化,延长饲料贮存期,从而提高饲料利用率.     

Detection of Tumor Necrosis Factor Gene by Piezoelectric Nucleic Acid Senosr

A piezoelectric nucleic acid sensor was constructed ofr detection of tumor necrosis factor gene.Two methods were employed for immobilization of nucleic acid probe on gold electrode of piezoelectric crystal.The results show that polyethyleneimine adbesion and glutaraldehyde cross-linking method has higher sensitivity,stability and selectivity than protein A method.The solid-phase nucleic acid hybridization of oligo unclecotides and tumor necrosis factor target gene sequence were monitorde using this sensor.Tumor necrosis factor gene sequence(580bp) was detected by this nucleic acid sensor for the first time.     

Electrogenerated Chemiluminescence Based on Tris(2,2′-bipyridyl) Ruthenium(II) with Hydroxyl Carboxylic Acid

Upon the electrochemical oxidation of tris(2,2′-bipyridyl) ruthenium(II) [Ru(bpy)²⁺₃] and hydroxyl carboxylic acids, for instance, citric acid, tartaric acid, malic acid, and -gluconic acid, bright electrochemiluminescences (ECLs) were observed. Different luminescent reactions were presented depending on the applied potential. The light emission was mainly caused by the reaction between alkoxide radical ion and Ru(bpy)³⁺₃below the potential +1.80 V (vs Ag/AgCl). The luminescence intensity obviously increased because of the more complex reaction process. The luminescence wavelength of 608 nm, which could be found either at higher potential than +1.80 V or in the potential range from +1.30 to +1.80 V, confirmed that ECL was caused by Ru(bpy)²⁺₃*. The factors which affect the determination and HPLC separation of the four acids were also investigated.     

铱(Ⅲ)与2-(5-溴-2-吡啶偶氮)-5-二甲氨基苯胺的显色反应及其应用

研究了试剂2_(5_溴_2_吡啶偶氮 )_5_二甲氨基苯胺 (5_Br_PADMA)与铱 (Ⅲ )的显色反应 ;在 pH4.75～6.00的HAc -NaAc缓冲溶液中 ,铱 (Ⅲ )与5_Br_PADMA形成摩尔比为1∶2型稳定的红色络合物 ,在0.6mol/LH2SO4溶液中 ,其最大吸收波长为558nm ,表观摩尔吸光系数为5.1×104L/(mol·cm) ,铱 (Ⅲ )含量在0～0.8mg/L范围内符合比尔定律 ,采用加入适量EDTA的方法消除了Fe3 + 、Co2 + 、Ni2 + 等干扰离子 ,建立了在二元络合物体系中测定微量铱 (Ⅲ )的灵敏度高、选择性好、简便、稳定的分光光度法     

原油乳状液稳定性和破乳研究进展

本文从控制乳状液稳定性的一些因素－界面膜、界面张力、双电层、空间位阻、固体粒子、液晶、油相溶解度、连续相粘度等方面综述了有关乳状液稳定性的一些研究进展。对国内外有关原油乳状液的破乳研究也做了综述。同时，介绍了应用于乳状液稳定性研究的新的实验技术和仪器。     

Thermal decomposition of Mn(II) complex of nicotinamide

The complex Mn(Nica)₂Cl₂ (Nica=nicotinamide) was prepared, and its decomposition was studied by means of TG and DSC. The IR spectra of the products of thermal decomposition were examined at every stage. Kinetic analysis of the first stage of thermal decomposition was performed via the TG-DTG curves, and the kinetic parameters were obtained from analysis of the TG-DTG curves with integral and differential methods. The most probable kinetic function was suggested from a comparison of the kinetic parameters. Mathematical expressions were derived for the kinetic compensation effect.

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Zusammenfassung Der Komplex Mn(Nica)₂Cl₂ (Nica steht für Nikotinamid) wurde hergestellt und seine Zersetzung mittels TG und DSC untersucht. Die thermisch zersetzten Substanzen jedes Schrittes wurden mittels IR-Spektren untersucht. Anhand der TG-DTG-Kurven erstellte man eine kinetische Analyse des ersten Schrittes der thermischen Zersetzung, die kinetischen Parameter wurden aus den TG-DTG-Kurven unter Einsatz von Integrations- und Differentialmethoden ermittelt. Durch Vergleich der kinetischen Parameter wurde die wahrscheinlichste kinetische Funktion vorgeschlagen. Mathematische Ausdrücke für den kinetischen Kompensationseffekt wurden erhalten.

     

5－（4－氯苯基）－10，15，20－三苯基卟啉及其配合物的合成、结构表征及热分解机理

合成了标题卟啉配体及其钴、镍、铜、锌和铁的五种配合物．对它们进行了元素分析、ＵＶ、ＩＲ和荧光光谱等结构表征．用ＤＴＡ、ＴＧ、ＤＳＣ等手段研究了这些新化合物的热稳定性及热分解机理，实验结果与ＨＭＯ方法计算的结果一致．