金属离子对没食子酸（GA）—BZ非催化振荡反应的影响

测定了一系列金属离子对没食子酸（ＧＡ）－ＫＢｒＯ３－Ｈ２ＳＯ４体系非催化振荡反应的影响。从实验中发现,金属离子对上述振荡反应的影响可分为三类：（１）Ｃｅ３＋、Ｍｎ２＋、Ｆｅ（ｐｈｅｎ）２＋３、Ｂｉ３＋和Ｃｒ３＋,可促进ＧＡ－ＢＺ体系的非催化振荡反应,同时可产生连续振荡等复杂振荡现象;（２）Ｃｕ２＋、Ｚｎ２＋、Ｌ３＋ａ、Ｓｍ３＋、Ｅｕ３＋、Ｎｉ２＋、Ｃｏ２＋、Ｈｇ２＋、Ａｇ＋和Ｈｇ２＋２对振荡反应具有强烈的抑制作用;（３）碱金属和碱土金属离子对振荡反应几乎不发生影响。对上述金属离子的影响机理进行了探索,说明金属离子的电极电势、金属离子与ＧＡ形成络合物或与Ｂｒ－形成沉淀是影响上述振荡反应的主要原因,而金属离子与有机物中间体的偶合催化导致产生连续振荡反应     

离子缔合物二级散射光谱的分析应用：Ⅲ.汞（Ⅱ）—硫氰酸盐—罗丹明染…

本文研究［Ｈｇ（ＳＣＮ）４］＾２－络阴离子与罗丹明Ｂ和罗丹明６Ｇ离子缔合络物的二级散射和“反二级散射光谱；考察了光谱特生、影响因素及适宜的反应条件；确定了ＤＳ和ＡＤＳ强度与溶液中汞（Ⅱ）浓度的关系；提出了用ＡＤＳ法测定痕量汞的新的高灵敏度分析方法，并有对关机理作了初的探讨。     

牛血清白蛋白与偶氮胂Ⅲ-镱(Ⅲ)结合反应及其应用

研究了在酸性溶液中ＢＳＡ与偶氰胂Ⅲ－镱（Ⅲ）络合物的结合反应。发现加入ＢＳＡ后偶氮胂Ⅲ－镱（Ⅲ）的吸收光谱产生减色效应和红移,探讨了实验条件对结合反应的影响。随着ＢＳＡ量的增加,６５０ｎｍ吸收峰线性下降,基于此建立了蛋白质定量分析方法,并运用于实际样品的测定,结果与紫外分光光度法测得的结果吻合。用分光光度法研究ＢＳＡ与偶氮胂Ⅲ－镱（Ⅲ）之间的结合模型,发现结合反应符合Ｓｃａｔｃｈａｒｄ模型。进一步的研究发现ＢＳＡ与阳离子表面活性剂、偶氮胂Ⅲ－镱（Ⅲ）－镱（Ⅲ）之间的作用机理相类似。     

掺杂元素的Lewis酸强度对掺杂In2O3电性质的影响

掺杂元素的Ｌｅｗｉｓ酸强度对掺杂Ｉｎ_２Ｏ_３电性质的影响文世杰Ｇ．Ｃａｍｐｅｔ（ＬａｗｒｅｎｃｅＢｅｒｋｅｌｅｙＬａｂｏｒａｔｏｒｙ，ＢｅｒｋｅｌｅｙＣＡ９４７２０，ＵＳＡ）（ＬａｂｏｒａｔｏｉｒｅｄｅＣｈｅｍｉｅｄｕＳｏｌｉｄｅｄｕＣＮＲＳ，Ｕｎｉ...     

Cl_q—VT免疫吸附剂制备及其吸附循环免疫复合物性能初探

本文在最佳条件下将猪Ｃｌｑ与活化的ＶＴ树脂反应制备了Ｃｌｑ－ＶＴ免疫吸附剂，每克干重ＶＴ可结合０．５ｍｇＣｌｑ，可吸附１．４ｍｇ热凝聚人ＩｇＧ（ＡＨＧ）。ＳＤＳ—ＰＡＧＥ结果表明Ｃｌｑ－ＶＴ免疫吸附剂只对ＡＨＧ特鼻吸附，而不吸附其它血清蛋白。应用Ｃｌｑ－ＶＴ免疫吸附剂吸附ＳＬＥ病人血浆中循环免疫复合物（ＣＩＣ），结果表明约有５２％的ＣＩＣ被清除。Ｃｌｑ－ＶＴ免疫吸附剂只能一次性地使用。     

染料结合2μm无孔硅胶亲和填料的制备与应用

在２μｍ无孔硅胶表面键合３ 氨丙基 三乙氧基硅烷（ＡＰＳ）,并与三嗪染料活性蓝Ｆ３ＧＡ（ＣｉｂａｃｒｏｎＢｌｕｅＦ３ＧＡ,ＣＢ）反应,制得亲和色谱填料,并采用扫描电镜、元素分析、ｐＨ稳定性测试对此填料进行鉴定与表征。该填料具有良好的色谱性能,且对生物大分子有一定的亲和选择性,改变ｐＨ值及离子强度对溶菌酶的结合量有明显影响,可用于分离卵清蛋白（Ｏｖａｌ）和溶菌酶（Ｌｙｓ）,且对α ,β ,γ 球蛋白有不同的亲和作用,并可从鸡蛋清中制备少量溶菌酶。     

A SENSITIVE PROTEIN ASSAY BY Co(II)-BIURET METHOD

ＡＳＥＮＳＩＴＩＶＥＰＲＯＴＥＩＮＡＳＳＡＹＢＹＣｏ（ＩＩ）－ＢＩＵＲＥＴＭＥＴＨＯＤ￥ＹｕｎＸｉａｎｇＣＩ；ＸｉａｏＴｉｎｇＴＡＮＧａｎｄＸｉａｏＤａＹＡＮＧ（ＤｅｐａｒｔｍｅｎｔｏｆＣｈｅｍｉｓｔｒｙ，ＰｅｋｉｎｇＵｎｉｖｅｒｓｉｔｙ，Ｂｅｉｊｉ...     

FERROMAGNETIC INTERACTION BETWEEN GADOLINIUM（Ⅲ） AND COPPER （Ⅱ）IONS IN N，N＇－BIS（2－AMINOPROPYL）OXAMIDO COPPER（Ⅱ） BRIDGED BINUCLEAR Gd（Ⅲ）－Cu（Ⅱ） COMPLEX

ＦＥＲＲＯＭＡＧＮＥＴＩＣＩＮＴＥＲＡＣＴＩＯＮＢＥＴＷＥＥＮＧＡＤＯＬＩＮＩＵＭ（Ⅲ）ＡＮＤＣＯＰＰＥＲ（Ⅱ）ＩＯＮＳＩＮＮ，Ｎ＇－ＢＩＳ（２－ＡＭＩＮＯＰＲＯＰＹＬ）ＯＸＡＭＩＤＯＣＯＰＰＥＲ（Ⅱ）ＢＲＩＤＧＥＤＢＩＮＵＣＬＥＡＲＧｄ（Ⅲ）－Ｃｕ...     

BOND LENGTHS OF BUCKY-BALLS C_(60), C_(240), C_(540), AND C_(960)

ＢＯＮＤＬＥＮＧＴＨＳＯＦＢＵＣＫＹ－ＢＡＬＬＳＣ_（６０），Ｃ_（２４０），Ｃ_（５４０），ＡＮＤＣ_（９６０）￥ＬｅｉＬＩＵ；ＫａｉＴａｉＣＨＥＮ；ａｎｄＹｕＦｅｎＬＩ（ＤｅｐａｒｔｍｅｎｔｏｆＰｈｙｓｉｃｓ，ＦｕｄａｎＵｎｉｖｅｒｓｉｔｙ，Ｓｈａｎ...     

THE ATOMIC WEIGHT OF DYSPROSIUM

ＴＨＥ ＡＴＯＭＩＣ ＷＥＩＧＨＴ ＯＦ ＤＹＳＰＲＯＳＩＵＭ￥ＴｓｉｎｇＬｉｅｎＣＨＡＮＧ．（ＤｅｐａｒｔｍｅｎｔｏｆＣｈｅｍｉｓｔｒｙ，ＰｅｋｉｎｇＵｎｉｖｅｒｓｉｔｙ，Ｂｅｉｊｉｎｇ１００８７１）ＤｉｎｇＳｈｕｎＣＡＯ（ＢｅｉｊｉｎｇＧｅｏｌｏ...     

锌试剂与牛血清白蛋白作用机理的研究

采用UV光谱法研究了锌试剂与牛血清白蛋白(BSA)在弱酸性溶液中的结合反应,研究了溶液吸光度与BSA浓度的关系。测得其表观摩尔吸光系数ε_P=1.3×10⁶L·mol^-1·cm^-1,最大结合数n=278,表观结合常数K_c=8×10⁷.研究了小分子探针与蛋白质的反应机理及在蛋白质上的结合部位及结合力类型。它们之间主要是以分子间的静电引力结合反应。离子强度对结合反应有显著的影响;不同类型的表面活性剂均以不同的程度和形式对反应有影响。讨论了此结合反应的模式,认为该反应基本符合Scatchard模型。     

Bromocresol green as a new spectrophotometric probe for serum albumins

Bromocresol green (BCG) has been employed as a new spectrophotometric probe to characterise the binding regions of human serum albumin (HSA) and bovine serum albumin (BSA). BCG binds with greater affinity onto BSA than onto HSA. Based on the abilities of ligands Naproxen and l-anilino-8-naphthalenesulphonic acid (ANS) to displace BCG from the serum albumins by competitive or non-competitive mechanism, binding regions were identified for these ligands. It has been found that both Naproxen and ANS share common binding sites with BCG in HSA with the relative ability of Naproxen > ANS on binding to HSA. In the case of BSA, ANS competes with BCG for the same binding sites, whereas Naproxen exhibits non-competitive binding. The highaffinity sites of Naproxen coincide with BCG binding sites while the low-affinity sites occur at sites distinct from the BCG binding region.     

有机磷药物在水产品中的存在状态研究及其分析应用

用分子荧光法、气相色谱法探讨了有机磷药物在以蛋白质为主要基质的水产品中的存在状态, 并研究了蛋白质对有机磷药物提取的影响. 结果表明, 有机磷药物与蛋白质有较强结合作用. 体积分数为70%～90%乙腈水溶液可引起蛋白质变性伸展, 利于释放结合的药物, 从而提高蛋白质基质中的有机磷提取回收率. 以体积比乙腈∶乙酸∶水＝90∶1∶9的溶液提取鱼肉样品中的有机磷药物, 以PSA, GDX-103为混合颗粒吸附剂, 以无水硫酸镁、无水醋酸钠为混合无机盐除水剂, 经离心分离去除基质后萃取液直接进样测定了鱼肉中5种有机磷药物(敌敌畏、甲胺磷、乐果、甲基对硫磷和乙基对硫磷), 测定回收率为72.97%～107.21%, 检出限为0.002～0.045 mg•kg^－1. 方法操作步骤简单、快速、高效.     

Biomolecular Binding under Confinement: Statistical Predictions of Steric Influence in Absence of Long-Distance Interactions

We propose a theoretical model for the influence of confinement on biomolecular binding at the single-molecule scale at equilibrium, based on the change of the number of microstates (localization and orientation) upon reaction. Three cases are discussed: DNA sequences shorter and longer than the single strain DNA Kuhn length and spherical proteins, confined into a spherical container (liposome, droplet, etc.). The influence of confinement is found to be highly dependent on the molecular structure and significant for large molecules (relative to container size).     

Kinetic studies on the mechanism of the relative catalytic activities of surfactants in the oxidation of amino-acids by chloramine-T

The kinetics of oxidation of amino-acids by chloramine-T in the presence of two different surfactants (cationic and anionic surfactants) in acidic medium has been studied. The kinetic results show that the reaction is fractional and first order with respect to substrate and oxidant respectively. The influence of halides, ionic strength and solvent on the rate has been studied. The effect of surfactants on the reaction show that the reaction velocity is highly sensitive to the variation of surfactant concentration. The micelle-substrate binding constant (K) and co-operativity index have been calculated indicating the stability of the catalyst substrate micelles (complex) so formed. A probable reaction path has been suggested and discussed in the light of various experimental results and findings.     

锌试剂与壳聚糖的结合反应机理的研究

为从分子水平认识多糖分子与小分子之间相互作用的机理,应用光谱法研究了壳聚糖(CTS)与锌试剂(ZCN)的相互作用机理;测得ZCN-CTS复合物吸收光谱出现新的吸收峰所需的临界ZCN/CTS摩尔比为2.67×103, CTS对ZCN的最大结合数为6.93×103,实验值与理论值相吻合,证明了多糖与生物探针相互作用理论模型的可靠性;探讨了ZCN与CTS相互作用产生变色反应的机理,认为其是在ZCN与CTS大分子间发生静电相互作用的基础上,主要由ZCN与CTS大分子间的疏水相互作用所引起.     

Antigen-antibody binding kinetics for biosensor applications

The diffusion-limited binding kinetics of antigen (or antibody) in solution to antibody (or antigen) immobilized on a biosensor surface is analyzed within a fractal framework. The fit obtained by a dual-fractal analysis is compared with that obtained from a single-fractal analysis. In some cases, the dual-fractal analysis provides an improved fit when compared with a single-fractal analysis. This was indicated by the regression analysis provided by Sigmaplot (San Rafael, CA). These examples are presented. It is of interest to note that the state of disorder (or the fractal dimension) and the binding rate coefficient both increase (or decrease, a single example is presented for this case) as the reaction progresses on the biosensor surface. For example, for the binding of monoclonal antibody MAb 49 in solution to surface-immobilized antigen, a 90.4% increase in the fractal dimension (D_f1 toD _f2 ) from 1.327 to 2.527 leads to an increase in the binding rate coefficient (k₁ to k₂) by a factor of 9.4 from 11.74 to 110.3. The different examples analyzed and presented together provide a means by which the antigen-antibody reactions may be better controlled by noting the magnitude of the changes in the fractal dimension and in the binding rate coefficient as the reaction progresses on the biosensor surface.     

Investigation on the binding site in heparin by spectrophotometry

Heparin has a variety of biological activities, most of them due to heparin’s high sulfate groups. To gain insight into the mechanism of activation of the spectroscopic probe with sulfate groups of heparin in vitro, we have used a cationic dye by a spectrophotometric method. It is considered that the combination of heparin with methylene blue is due to noncovalent binding forces. Dye binding requires an organic chain structure form with sulfate groups. The solution equilibria of the reaction system are discussed. A new linear regression equation has been proposed, in which the maximum binding number N expresses the binding ability of methylene blue (MB) with sulfate groups of heparin. The linear regression equation can estimate this parameter.     

The interaction of Bromophenol Blue with proteins in acidic solution

The interactions of Bromophenol Blue (BPB) with bovine serum albumin and gamma-globulin in acidic solutions were investigated by a spectrophotometric method. It was considered that the electrostatic force is the main binding force, and that the color change during the combination is due to the transformation of dye species of free acidic form into bound basic form as well as to the bathochromic and hyperchromic effects of conjugation. The formation of an isosbestic point in the absorption spectra was explained based on a new consideration about the solution equilibria. Two conditional constants, apparent binding constant and maximum binding number, were defined to express the binding ability of a dye to a certain protein under a given set of conditions, and two linear regression equations were derived to determine these two parameters and the molar absorptivity of bound dye. The Scatchard model is not appropriate in the treatment of data obtained here. The factors which influence the sensitivity of a dye binding protein assay were discussed, and the Sandell index was used to express the sensitivity of protein detection. It was found that sodium chloride concentration and acidity of the solutions have significant effect on the sensitivity of BPB protein assay.     

激光光散射与荧光光谱法研究大豆苷与牛血清白蛋白作用及聚集态

荧光光谱法和动态光散射法研究大豆苷与牛血清白蛋白在生理条件下的相互作用. 研究表明, 大豆苷与牛血清白蛋白能形成2∶l复合物, 荧光猝灭属于静态猝灭过程; 大豆苷与牛血清白蛋白分子间主要的结合作用力为疏水作用; 310 K下, 两者结合常数和结合位点数分别为7.4×l04 L•mol―1和1.75; 大豆苷使牛血清白蛋白的构象发生了变化; 动态光散射数据探讨了牛血清白蛋白与大豆苷分子产生聚集与之相互作用, 进一步证实了牛血清白蛋白在大豆苷水溶液中的构象变化. 实验结果为进一步研究大豆苷对心血管疾病的药理作用, 特别是对血浆蛋白构象的影响提供了重要依据.