The method showed promising results compared with conventional methods . the second part : we mainly reported the synthesis of some chemical reagents such as palladiumphthalocyanine , palladium 4 , 4 ' , 4 " , 4 ' " - tetranitrophthalo - cyanine , pvp - chitosan grafting copolymer , n - propyl carboxylate , propionic esters （ 2 ）在第6章利用pvp优良的生物相容性，将其接枝到甲壳糖分子链，以改善甲壳糖作为组织工程材料应用的不足之处。
The pocket accommodating the aromatic ring of phenylalanine is formed predominantly by hydrophobic side - chains , including those of ile10 , ile13 , prol50 , leul75 , leul79 , phe209 , ser211 and val221 ; whilst the amino group and carboxylate group of phenylalanine is coordinated by asp6 , asp7 , gln151 and ser180 . the n - terminal region is found to be important to the function of arog . point mutation reveals that residue substitution of ilelo to ala10 leads to desensitization in the presence of 1 mm phenylalanine , simultaneously , exhibits a dramatic decrease in enzymatic activity 综合前人的研究和本研究工作的实验数据，得出以下结论： 1 )在arog的反馈抑制位点供苯丙氨酸结合的疏水口袋由asp6 、 asp7 、 ile10 、 ile13 、 pro150 、 gln151 、 leu175 、 leu179 、 ser180 、 phe209 、 ser211和val221等12个氨基酸残基构成； 2 )苯丙氨酸结合的疏水口袋分为两个区域，与苯丙氨酸的苯环发生疏水作用的区域由ile10 、 ile13 、 pro150 、 leu175 、 leu179 、 phe209和val221的侧链构成，而asp6 、 asp7 、 gln151和ser180的侧链构成了与苯丙氨酸的氨基和羧基相互作用的区域。
The short - chain carboxylates and inorganic composition of leachates from the fluid inclusions in some quartz vein - type gold deposits in the southeastern guizhou province were determined by ion - chromatogrphy . there are some formate , acetate and oxalate in leachates in small amounts , and the content of formate is greater than that of acetate 用离子色谱法测定了黔东南某些石英脉型金矿床的石英流体包裹体浸取液中的短链羧酸和无机组分，发现其中含有甲酸盐乙酸盐和少量草酸盐，且
The company is engaged in pharmaceutical health care products , intermediates , chemical reagent and series products of cu salts , among which , health care products includes carnitine products , pyridine chromium carboxylate , potassium or sodium sulfate specially for amino - glucose sulfates 主要从事医药保健品及中间体、食品添加剂、化学试剂和铜盐化工系列产品的研制与生产，其中医药保健品主要有《肉碱系列》 《吡啶羧酸铬》 、氨基葡萄糖硫酸盐专用《硫酸钾、硫酸钠》等产品。
In this paper , a new class of concrete high performance water reducer ( hpwr ) was designed from chemical classification of high performance wra , working principle and unit structure model of poly - carboxylate series wra . the comb - like copolymer structure of hpwr was " carboxylic group - ether link - ester link " . the synthetic chemical materials was polyethylene glycil , acrylic acid and methyl - metacrylic acid ester 本文从高性能减水剂的化学结构、作用机理以及聚羧酸类减水剂的单元结构模型出发，设计出国内所没有的一类新型高性能减水剂? ? “羧酸?醚键?酯键”为单元结构模型的梳型分子结构的减水剂共聚物，并确定了以聚乙二醇( peg )系列、丙烯酸( aa ) 、甲基丙烯酸甲酯( mma )为合成该类减水剂的主要化学原料。
