羧基的

The flotation mechanism of MG reverse-floating dolomite was studied by measuring the Zeta-potential of collophanite and dolomite, Infrared Absorptions Spectra analysing the adsorption of MG onto the minerals surface, ultraviolet- visible light absorbing spectrum calculating the amount of MG which was adsorbed onto the minerals surface. These researches showed that MG was more easyly adsorded onto the surface of dolomite in feeble acidic solution because of pure dolomite charges positive as well as pure collophanite charges negative. Therefore, a lot of MG negative ions was adsorded onto dolomite, and that MG negative ions contained hydrophobic group, the hydrophobicity of dolomite was modified, the grains of dolomite were adhered to air bubble and float with them.

对白云石和胶磷矿的Zeta-电位测定、红外光谱分析MG药剂在矿物上面的吸附情况、紫外-可见吸收光谱测定矿物上MG的吸附量等，研究了MG药剂反浮选白云石的浮选作用机理，表明在弱酸性条件下，由于白云石表面荷正电而胶磷矿表面荷负电，带有羧基和羟基官能团的MG药剂更容易吸附在白云石上，使其周围吸附有大量的MG负离子，而MG负离子的另一端为烃基，这就改变了白云石的疏水性，使其矿粒容易附着于气泡上浮。

Among the six bonds in 3, the P_O bond between the phosphorus and carboxyl oxygen O3 was the weakest one, and could be easily broken to form a new penta-coordinate intermediate 4 which could yield the phosphoryl N→O migration product 5 by breaking the weaker P_N bond.

在六配位磷中间体3的6根键中，丝氨酸的羧基氧O3与磷之间的键最弱，最易断裂生成新的五配位磷中间体4， 4的P_N键断裂得到磷酰基的N→O转位反应产物5。

The three isomers structures of 3 were discussed in detail based on the calculation results. Among the six bonds in 3, the P_O bond between the phosphorus and carboxyl oxygen O3 was the weakest one, and could be easily broken to form a new penta-coordinate intermediate 4 which could yield the phosphoryl N → O migration product 5 by breaking the weaker P_N bond.

在六配位磷中间体3的6根键中，丝氨酸的羧基氧O3与磷之间的键最弱，最易断裂生成新的五配位磷中间体4， 4的P_N键断裂得到磷酰基的N→O转位反应产物5。

It demonstrated that the hydroxy organic acids substituted with-OH,-SH at α—C such as lactic acid, Hydroxy-acetic acid, mercapto-acetic acid, glyconic acid have good selectivity for separation of hematite and aegirine pka values of organic acids fall down because of the-I inductive effect of-OH or-SH, and lie at the pH range between two minerals point-zero-charge. As a result, the depression ability of them was enhanced, and a cyclo-pentyl chelate was formed when this organic acids acted with Fe〓 on the minerals surface.

发现在α位具有-OH、-SH等取代基的短链一元羧酸（乳酸、羟基乙酸、巯基乙酸，葡萄糖酸）对赤铁矿与钠辉石的浮选分离具有优良的选择性抑制作用，-OH、-SH的-I诱导效应导致有机酸的pKa值下降并落在两种矿物零电点之间，使其抑制性能增强，并与矿物表面的Fe〓形成稳定的五元螯合环。

Firstly, a series of organic molecules which use phthalimido group as electron acceptor, N as electron donor, COO~- as eletrofugal group were synthesized based on SET-promoted photocyclization processes. These compounds were irradiated by 500 W ultraviolet under nitrogen atmosphere in room temperature. After filtration of the photochemical character of these molecules, substrate S1 and S2 were selected as appropriate model reactants. Secondly, the monosubstituted derivatives at the 6-position ofβ-cyclodextrin were synthesized as chiral template of photocyclization.

首先，以单电子转移机理为指导，设计了一系列以邻苯二甲酰亚胺基为电子受体、N为电子给体、羧基为离去基团的光环合反应底物，这些化合物在氮气保护下以500瓦紫外光室温下进行光照反应，对这一系列的分子的反应情况进行了研究与筛选，最终选择底物S1和S2作为研究光环合反应中立体控制方法的模型底物；其次，又合成了一系列6-位单取代β-环糊精，以此作为光环合反应的手性模板。

The composition and structure of Soybean Protein Isolate are first introduced,Then the functional modification of SPI via chemical ways which include the reaction of amino group,carboxyl group and sulphydryl group,via enzymic ways which include the modification using transglutaminase enzyme and papain,via physical ways which include blending and heat treatment are reviewed.

首先介绍了大豆分离蛋白的基本组成与结构，然后分别从化学改性、酶改性和物理改性三个方面对大豆分离蛋白改性进行了综述。其中，在化学改性方面，针对大豆分离蛋白中含有的氨基、羧基、巯基等不同活性基团的改性原理及研究现状进行了介绍。在酶改性方面，主要介绍了谷胺酰胺转胺酶、木瓜蛋白酶等对大豆分离蛋白的改性作用。在物理改性方面，介绍了共混、加热改性等目前研究较多的方法。

A set of spectific primers was syn thesized according to HBV DNA sequence of Chinese strain, the whole X region was amplified by PCR method from the serum of 9 patients with chronic HBV infection , and then the PCR products were subcloned into pGEM Teasy vectors. Clones were randomly selected to be sequenced. Comparison of the cloned sequence was made to find the difference. After being compared, each sequence of selected clones is o f difference. The point mutation scattered through X region. Deletion mutations were detected in 19 clones of 37(51.4%), which caused different carboxyl endings of X protein. There is a hot region (after 123 aa code) where deletion mutation frequently happens.

以中国株HBV基因序列为依据，设计特异性多聚酶链反应引物，自9例慢性HBV感染患者血清中扩增HBV X基因，克隆入pGEM Teasy质粒，随机挑选克隆进行D NA测序以确定病毒的变异程度。37例测序结果提示来源于不同患者HBV X基因序列高度保守，但每个序列均不一致。X区除了存在广泛的碱基点替换突变外，序列的缺失突变占测序克隆总数的51.4％（19／37）；氨基酸缺失及移框突变多发生于123位氨基酸残基之后，可导致X蛋白多种羧基端形式。

As CAAX-mimetics, 1, 3-dihydro-5-phenyl-2-H-1, 4-benzodiazepin-2-one was modified by linking carboxyl groups with various carbon through N-1 and C-3, 3-(imidazol-4-yl) propion amido group with different substituents was connected at C-7; In the synthesis of bisubstrate analogues, thiocarbamido compounds was alkylated by alkyl iodide and then hydrolyzed to give alkylthiol benzoate compounds.

1，4-苯并二氮杂草-2-酮类化合物的合成过程中分别对其1、3、4和7位进行了基团变化，在1和3位连接不同长度含羧基或酯基的侧链，在7位连接不同取代的咪唑丙酰氨基。在苯甲酸硫醇酯化合物合成过程中，建立了一种硫原子连有不同长度碳链的苯甲酸硫醇酯的合成方法。

The deduced peptide consists of 80 residues with a molecular mass of 7.6 kDa. It contains 17 cysteineresidues (21 mol%), out of which 8 are clustered in the amino-terminal domain of 23 residues, and 9 are clustered in the carboxy-terminal domain of 20 residues. The intermediated region contains 37 non-Cys residues.

它编码一个含80个氨基酸、分子量为7.6 kDa的蛋白质，Cys残基有17个，占21%；其中8个Cys分布在氨基端23个氨基酸组成的结构域内，9个分布在羧基端20个氨基酸组成的结构域内，中间是一段由37个氨基酸组成的非Cys区。

The principal component of water-soluble acids is the saturated aliphatic diacids of C〓 to C〓 and the saturated aliphatic monoacids of C〓 to C〓; and the water-insoluble acids are organic macromolecular compounds containing a large amount of carbonyl, carboxyl structures and aromatic group.

水溶酸的成分以C〓~C〓的饱和二元脂肪酸和C〓~C〓的饱和一元脂肪酸为主；水不溶酸是含有大量羰基、羧基结构和芳环的有机大分子化合物，其结构非常接近腐植酸。

Do you know, i need you to come back

你知道吗，我需要你回来

Yang yinshu、Wang xiangsheng、Li decang,The first discovery of haemaphysalis conicinna.

1〕 杨银书，王祥生，李德昌。安徽省首次发现嗜群血蜱。