C60-C60分子对撞的计算机模拟

采用紧束缚方法模拟了两个 Ｃ６０分子对撞的过程,画出了对撞时的分子图形,并给出了不同能量下对撞得到的结果     

PCR扩增人外周血淋巴细胞抗体基因的探讨

采用ＲＴ－ＰＣＲ法,以一组人抗体重链和轻链简并引物,直接从人外周血混合淋巴细胞中扩增出抗体重链Ｆｄ和κ轻链基因．结果提示：用Ｔｒｉｚｏｌ试剂提取细胞总ＲＮＡ,以Ｏｌｉｇ（ｄＴ）引导合成ｃＤＮＡ第一链,再经ＰＣＲ扩增的方法,是值得优先采用的方法．细胞总ＲＮＡ的提取不必追求高纯度,少量外周血即足以满足构建抗体库所需,简并引物可获得良好的扩增效果,为构建噬菌体抗体库奠定了基础     

溶液中外氛电子转移反应的电子传递系数的量子效应

用黄金规则和鞍点近似估算了电子转移速率的重要参数。考虑到量子效应对过渡金属氧化－还原的电子传递系数是重要的参量,采用了合适的光谱和光电发射,并根据已报导的电子耦合矩阵元的数据。     

Isolation and cloning of a novel cDNALDB1 encoding human LIM domain binding protein

Primers for screening cDNA library have been designed according to EST AA453734 which is corresponding to the mouse LIM domain binding protein Ldbl. Arrayed human fetal brain cDNA library has been screened by PCR and routine hybridization method. A 2398 bp-cD-NA clone has been obtained. The cDNA encodes a 347 amino acids protein highly homologous to the mouse Ldbl,Xenopus Xldbl andDrosophila Chip. It also contains an LIM binding domain and a nuclear localization signal. It has been namedLDB1 ( LIM domain binding protein 1), GenBank accession number is AF052389. Northern blot showed a 2.4 kb band, and the expression amounts ofLDBI in heart, brain and lung were considerably higher than those in other tissues.     

Nonlinear dissolution reaction of chalcopyrite

The dissolution experiments of chalcopyrite in 2 mol/L NaCI solutions at 70℃ show that the dissolution rate of chalcopyrite oscillates non-periodically with reaction time while in acid solutions (pH = 1.45-2.45) and far from Cu saturation concentration, and Cu concentration oscillates chaotically in solution of weak to intermediate acidity (pH = 3.66-7.0). In nonequilibrium and open systems, the nonlinear coupling between the dissolution of chalcopyrite and formation of cuprous chloride complexes and precipitation of hemitite caused by CI- , H+ and O2 is the internal mechanism of oscillatory changes of dissolution rate, and the nonlinear coupling between the dissolution of chalcopyrite and precipitation of atacamite induced by CI- and H+ has caused the chaotic oscillation of Cu concentration. There are consistence and difference between reaction rate oscillation and Cu concentration oscillation. However, both of them suggest that the dissolution of chalcopyrite in NaCI solution is a nonlinear reaction process.     

异氰酸与甲醛环加成反应机理的从头算研究-催化效应

采用从头算方法研究了异氰酸与甲醛环加成反应的机理,并研究了ＢＨ３对此反应的催化效应。结果表明,非催化反应基本上为同步的协同反应,而ＢＨ３催化的反应则为非同步的协同反应,且ＢＨ３催化反应比非催化反应容易进行得多。     

油菜花粉钙结合蛋白的研究

以油菜花粉(Brassica campestris)为材料纯化了钙调素(CaM),并得到一种新钙结合蛋白(NCBP)。经SDS-PAGE、PAGE和等电聚焦电泳(IEF)鉴定,这两种蛋白质均表现均一。CaM分子量为18.8kD, NCBP为16.3kD,等电点分别为3.6和4.2。研究证明花粉CaM具有与其他来源CaM所特有的性质,对环核苷酸磷酸二酯酶(简称PDE)有明显的激活作用,而花粉NCBP不明显。花粉CaM在PAGE和SDS-PAGE中电泳行为有Ca²⁺效应,而NCBP仅表现在PAGE中。经氨基酸组成分析表明两种蛋白质氨基酸组成不同,但均含有较多的酸性氨基酸,不含Trp, 含1个Cys。CaM和NCBP N-端均为封闭,CaM C-端为-Met-Ala-Lys-COOH。两种蛋白质具有不同的肽谱和CD谱。用DTNB修饰花粉CaM Cys残基,则激活PDE的能力明显下降。     

H3PNH＋H2CO类Wittig反应中四元环中间体的从头算研究

用从头算方法在ＭＰ２／６－３１Ｇ＊＊水平上优化出类Ｗｉｔｉｇ反应Ｈ３ＰＮＨ＋Ｈ２ＣＯ→Ｈ３ＰＯ＋Ｈ２ＣＮＨ中的中间稳定态、过渡态及复合态的几何构型。计算结果表明该反应是一个二步反应,在反应途径上存在一个四元环中间体。     

多羟基镓低聚物做交联剂制备交联粘土的研究

采用 Ｇａ３ ＋ 在土层中形成〔 Ｇａ１３〕７ ＋ 交联制得有序性和热稳定性较好的交联粘土本工作成功地用〔 Ｇａ１３〕７ ＋ 交联天然临安土、人工合成皂石及人工合成镓皂石,并制得全镓层柱型类分子筛经 Ｘ Ｒ Ｄ 表征了样品的晶相,元素分析确定了样品的化学组成与结构式 Ｎ Ｈ３ － Ｔ Ｐ Ｄ 及 Ｐｙ － Ｉ Ｒ 结果表明,交联合成土的酸量高于交联天然土;样品均含有 Ｂ 酸和 Ｌ 酸中心,且表面 Ｌ 酸所占的份额大催化活性测试结果表明,交联合成土的活性高于天然土,且全镓样品的异构选择性高     

CaO-SiO_2-MgO-H_2O体系的热力学研究

本文研究了ＣａＯ－ＳｉＯ２－ＭｇＯ－Ｈ２Ｏ体系的热力学,结果表明：ＳｉＯ２ 优先与ＣａＯ水热形成水化硅酸钙,多余的ＳｉＯ２ 才会与ＭｇＯ直接水热形成水化硅酸镁。当没有ＳｉＯ２ 时,ＭｇＯ才会水化形成Ｍｇ（ＯＨ）２。