Studies on HEPES Stabilizing M Intermediate of Bacteriorhodopsin

ＳｔｕｄｉｅｓｏｎＨＥＰＥＳＳｔａｂｉｌｉｚｉｎｇＭＩｎｔｅｒｍｅｄｉａｔｅｏｆＢａｃｔｅｒｉｏｒｈｏｄｏｐｓｉｎＦＵＸｕｅ－ｑｉ￣１,ＬＩＺｈｅｎｇ－ｑｉａｎｇ￣２,ＷＡＮＧＪｉｎ－ｄｕｉ￣１,ＷＡＮＧＢａＯ－ｈｕｉａ,ＬＩＢｏ－ｆｕ￣２ａｎｄＬＩ...     

固相配位化学反应研究：LXVII.金属铜表面M—S（M=Mo,W）簇合物的组成

采用ＦＴＩＲ、ＸＰＳ和ＡＥＳ研究了金属铜表面Ｍ－Ｓ（Ｍ＝Ｍｏ，Ｗ）簇合物膜。结果表明，Ｍｏ（Ｗ）Ｓ＾２－４与铜表面的Ｃｕ２Ｏ反应，形成了Ｍｏ（Ｗ）－Ｓ－Ｃｕ键。簇合物膜由Ｍｏ（Ｗ），Ｓ，Ｃｕ，Ｏ元素组成，分别呈＋６、－２、＋１、－２价，膜为多分子层结构并保持，ＭｏＳ４或ＷＳ２单元，膜表面只有Ｃｕ，Ｏ而不存在Ｍｏ（Ｗ），Ｓ，膜层厚度与反应时间有关，时间越长，膜越厚，膜为多组分的复杂体系，其颜色是各组     

固相配位化学反应研究LXVII．金属铜表面M－S（M＝Mo，W）簇合物膜的组成

采用ＦＴＩＲ、ＸＰＳ和ＡＥＳ研究了金属铜表面Ｍ－Ｓ（Ｍ＝Ｍｏ，Ｗ）簇合物膜。结果表明，Ｍｏ（Ｗ）与铜表面的Ｃｕ＿２Ｏ反应，形成了Ｍｏ（Ｗ）－Ｓ－Ｃｕ键；簇合物膜由Ｍｏ（Ｗ）、Ｓ、Ｃｕ、Ｏ元素组成，分别呈＋６、－２、＋１、－２价，膜为多分子层结构并保持ＭｏＳ＿４，或ＷＳ＿２单元，膜表面只有Ｃｕ、Ｏ而不存在Ｍｏ（Ｗ）、Ｓ．膜层厚度与反应时间有关，时间越长，膜越厚。膜为多组分的复杂体系，其颜色是各组分统计分布的结果。     

Studies on Intramolecular Stacking Interaction of Ternary Complexes M（Ⅱ）（ATP）￣（2－） with Heteroaromatic N－Base Ligands

ＳｔｕｄｉｅｓｏｎＩｎｔｒａｍｏｌｅｃｕｌａｒＳｔａｃｋｉｎｇＩｎｔｅｒａｃｔｉｏｎｏｆＴｅｒｎａｒｙＣｏｍｐｌｅｘｅｓＭ（Ⅱ）（ＡＴＰ）￣（２－）ｗｉｔｈＨｅｔｅｒｏａｒｏｍａｔｉｃＮ－ＢａｓｅＬｉｇａｎｄｓＷＵＦｕ－ｌｉａｉ，ＳＯＮＧＢｉｎ，ＺＨ...     

Mo(W)-Cu(Ag)-S原子簇化合物的研究现状

本文在研究Ｍｏ（Ｗ）－Ｃｕ（Ａｇ）－Ｓ原子簇化合物的低热固态合成化学基础上，详细地对该类簇合物进行了归纳，从中提出；１，ＭＯ４－ｎＳｎ＾２＾－（Ｍ＝Ｍｏ，Ｗ；ｎ＝２，３，４）作为配体中心。２，氧原子在簇合物中仅作为端基，不参与同其他金属成键。３，单个ＭＳ４（Ｍ＝Ｍｏ，Ｗ）基团最多只能键合六个Ｃｕ（Ａｇ）原子，即最大核数为七。４，迄今为止所有Ｍｏ（Ｗ）－Ｃｕ－Ｓ原子簇化合物中Ｃｕ均为＋１价。５，预计     

CONVERSION OF KETONES INTO1，1－DISUBSTITUTED－2，3，3－TRIFLUORO－2－PROPEN －1－OLSWITH1，1－DIBROMO－1，2，2，2－TETRLUORO ETHANE／MAGNESIUM REAGENT

ＣＯＮＶＥＲＳＩＯＮ　ＯＦ　ＫＥＴＯＮＥＳ　ＩＮＴＯ１，１－ＤＩＳＵＢＳＴＩＴＵＴＥＤ－２，３，３－ＴＲＩＦＬＵＯＲＯ－２－ＰＲＯＰＥＮ　－１－ＯＬＳＷＩＴＨ１，１－ＤＩＢＲＯＭＯ－１，２，２，２－ＴＥＴＲＬＵＯＲＯ　ＥＴＨＡＮＥ／ＭＡＧＮＥＳＩＵＭ...     

微波溶样－ICP－AES法测定人发标准物质中15种超痕量稀土元素的研究

本文采用微波溶样，不经分离富集，直接用标准加入ＩＣＰ－ＭＳ法，测定人发标准物质中１５种超痕量稀土元素。选择了最佳样品预处理条件和测定的最佳仪器参数。检出限为０．００７～０．０２６ｎｇ／ｍＬ。用国家一级土壤标准物质（ＧＢＷ０７４０１和ＧＢＷ０７４０３）作为质控样，１５种痕量稀土元素的测得值与标准值很好地吻合，相对标准偏差（ＲＳＤ）为１．２％～５．４％。国家一级人发标准物质（ＧＢＷ０７６０１）中稀土元素的标准值仅有Ｌａ，Ｃｅ和Ｙ，本法测得值均落在标准值的置信区间内。其余１２个超痕量稀土元素本法也取得了较为满意的结果。     

Mo（W）－Cu（Ag）－S原子簇化合物的研究现状

本文在研究Ｍｏ（Ｗ）－Ｃｕ（Ａｇ）－Ｓ原子簇化合物的低热固态合成化学基础上，详细地对该类簇合物进行了归纳，从中提出：１．（Ｍ＝Ｍｏ，Ｗ；ｎ＝２，３，４）作为配体中心．２．氧原子在簇合物中仅作为端基，不参与同其他金属成键．３．单个ＭＳ４（Ｍ＝Ｍｏ，Ｗ）基团最多只能键合六个Ｃｕ（Ａｇ）原子，即最大核数为七．４．迄今为止所有Ｍｏ（Ｗ）－Ｃｕ－Ｓ原子簇化合物中Ｃｕ均为＋１价．５．预计合低价态Ｍｏ（Ｗ）的这类簇合物将会有很大进展．     

Formation of Self-organization InAs Quantum Dots on (001) InP Substrate by As/P Exchange Reaction in MOCVD

ＦｏｒｍａｔｉｏｎｏｆＳｅｌｆ┐ｏｒｇａｎｉｚａｔｉｏｎＩｎＡｓＱｕａｎｔｕｍＤｏｔｓｏｎ（００１）ＩｎＰＳｕｂｓｔｒａｔｅｂｙＡｓ／ＰＥｘｃｈａｎｇｅＲｅａｃｔｉｏｎｉｎＭＯＣＶＤ＊ＷＡＮＧＢｅｎ－ｚｈｏｎｇ＊,ＺＨＡＯＦａｎｇ－ｈａｉ,ＰＥＮＧＹ...     

Syntheses of 3－Methyl－1－propyl－4－piperidoneand1－Methyl－3，7－dipropyl－3，7－diazabicyclo［3，3，1］nonan－9－one

Ｓｙｎｔｈｅｓｅｓｏｆ３－Ｍｅｔｈｙｌ－１－ｐｒｏｐｙｌ－４－ｐｉｐｅｒｉｄｏｎｅａｎｄ１－Ｍｅｔｈｙｌ－３,７－ｄｉｐｒｏｐｙｌ－３,７－ｄｉａｚａｂｉｃｙｃｌｏ［３,３,１］ｎｏｎａｎ－９－ｏｎｅＷＡＮＧＹｕ－ｈｕａｎ,ＷＡＮＧＧｕｏ－ｊｉａ,Ｚ...     

脱铝沸石羟基窝的表征

NH4Y和NaY沸石用草酸溶液脱铝制备的样品，用红外光谱测定了表征“羟基窝”的3710cm-1处的背底吸光度（A3710）．并考察了其热稳定性；用DTA和TGA建立了定量测定“羟基窝”的方法，并测定了各样品的“羟基窝”浓度，样品的“羟基窝”浓度与其实际脱铝数相对应     

热熔挤出法联合静电纺丝法制备新型抗炎缓释系统

报道了一种制备具有“核-壳”结构和双重释放过程的可降解抗炎缓释系统(3)的新方法。以聚（乙交酯-丙交酯）（PLGA50）为药物载体,先通过热熔挤出法将绿原酸（CA）与PLGA50共挤出得挤出物（1）;利用静电纺丝法在1表面包裹一层“PLGA50+CA”静电纺丝膜（2）,制得具备“核-壳”结构的材料（3）。采用SEM, TGA, DSC和LC-MS研究了CA的热稳定性,1的热力学性能,3的微观形态和体外药物释放行为。结果表明：3具有“核-壳”结构;引入CA,降低了PLGA50的玻璃化转变温度;3的药物释放为双重释放过程。     

新型薄层色谱内标法测定葛根素含量

以大豆甙元为内标物在高效硅胶薄层板上采用新型内标法测定了葛根素注射液、中药葛根及中成药玉泉丸中葛根素的含量,建立了新型TLC内标法测定葛根素的新方法。结果表明：用大豆甙元作为内标物测定葛根素可以满足TLC内标物的一般条件,新型TLC内标法测定葛根素的含量具有测定结果准确,精密度好,回收率高等优点。     

Simultaneous kinetic determination of chlorpyrifos and carbaryl based on differential degradation processes in alkaline oxidative medium

A kinetic method for the simultaneous determination of chlorpyrifos and carbaryl is described. The method is based on the degradation of these compounds in alkaline hydrogen peroxide medium by measuring the absorbance at two different reaction times and at two different wavelengths. A homemade stopped-flow system coupled with a diode-array detector and the proportional equation method was used. Resolution was achieved over chlorpyrifos: carbaryl ratios ranging from 61 to 14, with relative errors of 4 and 3%, respectively. The method was successfully applied to the analysis of a commercial formulation.     

Determinations of uranium at trace and subtrace levels in organic substances by wet ashing-Arsenazo III method

A method was developed for the determination of trace and subtrace amounts of uranium in organic substances used during the industrial process of nuclear fuel production. The method is based on decomposing 50 g of the sample by wet ashing with 25 g conc. sulfuric acid. The residue from the ashing process was ignited at 525 °C to remove all carbonaceous materials. The residue was boiled with 10 ml of 11 nitric acid. The resulting solutions was analyzed for uranium concentration using a modification of the arsenazo III method which allows for uranium determination after separating it by TBP extraction from all the interfering elements. The proposed method proved to be sensitive (detection limit: 15 ppb). The relative standard deviation of the method for a sample containing 200 ppb uranium is 5%. The dynamic range of the method is wide, since the method is applicable. for trace and subtrace levels of uranium in organic substances.     

Residues analysis of post-harvest imidazole fungicides in citrus fruit by HPLC and GLC

The determination of imazalil and prochloraz fungicide residues has been carried out by HPLC with an UV detector at 204 nm and by GLC with an electron capture detector (ECD). In both cases fungicide residues were extracted with hexane/acetone (90:10, v/v) after pH adjustment and purified by a liquid-liquid partitioning process. When HPLC was used for prochloraz and imazalil analysis, it was necessary to eliminate the interfering substances with a further clean-up process. This was also required when samples with low residue levels were analyzed by GLC. Recovery was always higher than 70%. The detection limit was 0.04 ppm for the HPLC method and 0.02 for the GLC method. Imazalil and prochloraz residues in "Washington Navel" oranges and "Hernandina" clementine fruits, dipped in a 1000 ppm fungicide solution, are reported.     

Time-variable Method for Studying Reaction Rates in a Calorimeter

A novel method for the determination of rate constants of reactions, the time-variable method, is proposed in this paper. The method needs only three time points (t), peak heights () and pre-peak areas (), obtained from the measured thermoanalytical curve. It does not require the thermokinetic reaction to be completed. It utilizes data-processing on a computer to give the rate constants. Four reaction systems, including a first-order reaction, second-order reactions (with equal concentrations and with unequal concentrations) and a third-order reaction, were studied with this method. The method was validated and its theoretical basis was verified by the experimental results.This revised version was published online in November 2005 with corrections to the Cover Date.     

Solvent extraction of Re/VII/ with methylene blue into nitrobenzene

A method has been developed for the extraction of rhenium/VII/ with methylene blue. Nitrobenzene was found to be the most effective extractant for Re/VII/. The stoichiometry of metal to reagent determined by the method of substoichiometric extraction and slope-ratio method was found to be 11.     

Spectrophotometric Determination of Acyclovir and Amantadine Hydrochloride through Metals Complexation1

A simple spectrophotometric method for determination of some antiviral drugs, such as acyclovir and amantadine hydrochloride in pure and dosage forms, have been developed. The proposed method is based on the reactions of the selected drugs and metals. Acyclovir was reacted with copper (II) and cobalt (II) using a borax/sodium pH 9 hydroxide buffer, and in a non-aqueous medium using 1% pyridine in methanol, respectively.The formed complexes were absorbed maximally at A, 290 nm and at X 287 nm. The method determined from 112–1620 g/mL of acyclovir, with a mean percentage of recovery of 99.32 ± 0.63 and of 98.77 ± 0.70 for copper (II) and cobalt (III), respectively.The suggested method was applied to a Novirus capsule, and its validity was ascertained by the standard addition technique. In addition, amantadine hydrochloride was allowed to react with iron (III) at pH 3 adjusted with 0.1 M ammonium hydroxide. The formed complex absorbed maximally at 295 nm. This method determined from 94–940 g/mL of amantadine hydrochloride with a mean percentage of recovery of 99.49 ± 0.57. The suggested method was applied to an Adamine capsule, and its validity was ascertained by the standard addition technique.     

Comparative study of isothermal and non-isothermal thermokevetic processes

In this paper a graphical and analytical method is presented for generating reaction isotherms from a set of non-isotherms andvice versa. The method was tested by using computer generated curves. The method was also checked by studying the kinetics of dehydration of calcium oxalate in a static atmosphere. The reaction was monitored in both non-isothermal (with nine heating rates between 0.5 and 60°C min^–1) and isothermal modes (at 150, 160 and 170°C). The 160°C isotherm obtained experimentally was compared with that obtained by graphical method from non-isotherms determined experimentally and the differences of were less than 3%.