Dl - aspartic acid has been synthesized from maleic anhydride and ammonia , the yield of dl - aspartic acid was above 70 % which is much higher than those reported in the literature 摘要以顺丁烯二酸酐与氨水为原料合成dl -天冬氨酸，使其得率由现有的63 %提高到70 %以上，并对其反应机理进行了研究。
The optimal temperature , the optimal ph value and the optimal substrate ( l - aspartic acid ) concentration for the enzymatic reaction by adl were 40 , 5 . 0 and 66 . 5 ~ 133g / l , respectively 对固定化细胞性质进行的初步研究发现，其最适温度为40 ，最适ph为5 . 0 ，最适底物浓度范围为66 . 5 133g l 。
( 2 ) l - cystine , tyrosine , dl - aspartic acid , l - lysine were used as soft - templates to regulate and control the crystallization of caco3 . the effects of different amino acid to the growth of caco3 ( 2 )分别以l一肤氨酸、 l一酪氨酸、 dl一天冬氨酸、 l一赖氨酸作为软模板，分别研究了其对碳酸钙晶体生长的影响。
A packed bed reactor filled with the immobilized cells was developed to continuously produce l - alanine from l - aspartic acid . the reactor with100g / l substrate solution had been running for 20 days at 37 在温度37 、底物浓度100g l的条件下，该固定化细胞在填充床反应器中连续运行20天，测得其半衰期为71天。
All proteases use water to cut their respective proteins , and enzymes in the aspartyl protease family employ a pair of aspartic acids to activate a water molecule for this purpose 所有的蛋白酶都会利用水来切割其作用的蛋白质，而天冬胺酸蛋白酶家族的成员，则还会利用两个天冬胺酸分子来活化水分子，以利蛋白质的切割。
As expected from the reaction mechanism , the carboxyl groups of aspartic and glutamic acid residues were not modified , while the amino groups that could react with the activated peptides were concomitantly protected by formylation 如反应机理所预测的那样，天门冬氨酸和谷氨酸残基未被修饰，而能与活性肽反应的氨基则同时被甲酰化保护起来。
Based on the above results , a method for producing l - alanine from l - aspartic acid using immobilized pseudomonas dacunhae cells was investigated in this thesis . the cells were immobilized with k - carrageenan and treated with two kind of hardening agents 结果发现，以-卡拉胶作为包埋剂、再经两种硬化剂处理得到的固定化细胞，具有较高的酶稳定性和回收率。
4 . the magnesium ions , l - cystine , tyrosine , dl - aspartic acid , l - lysine , and the mixed system of magnesium ions and amino acid were used as effective soft - templates to regulate and control the crystallization of caccb , respectively 以镁离子、 l -胱氨酸、 l -酪氨酸、 dl -天冬氨酸、 l -赖氨酸以及它们的混合体系为模板，研究了其对碳酸钙晶体生长的调控作用。
Considering that aspartic acid ( d ) and glutamic acid ( e ) are very similar to each other , together with the biological function of the landmark , thus that the two landmarks can be regarded as no difference ; 3 ) conservative cysteine in terms of their numbers and positions in the extracellular domain . in ghr1 group , fghrl and zfghrl have seven cysteins , which are the same as that of quadruped . in ghr2 group which includes cohoghr isf1 , cohoghr isf2 , chghr , fghr2 and zfghr2 , the cysteine number and positon are very similar to each other but are different from ghr1 group . especially , the fghr2 has five cysteins that is one more than zfghr2 ; 3 ) conservative boxl domain . with all the ghrs identified so far , boxl are comprised of ppxpxp ( x represents any amino acid ) 在fghri和zfghri都为7个，数目和四足动物ghr一致;在fghrz胞外肤氨酸残基为5个， zfghrz为4个，和同属于ghrz的eohoghrisfl 、 eohoghrisfz 、 ehghr基本保持一致，但是却和传统的ghri有比较大的区别; 3 )本试验克隆和分离得到ghri和ghrz以及所有目前发表的ghr都有比较保守的boxl结构域，氨基酸组成为ppxpxp ，研究表明最后两个脯氨酸残基作用最大; 4 )在所有ghr中都完全一致的boxz ，序列为料efi ; 5 )在ghri和ghrz胞内部分都比较保守的酪氨酸残基，他们被认为在信号传导中起作用。
Recently , ldl apheresis has been applied in clinic and achieves a satisactory effect . in this dissertation , the tripeptide , serine - aspartic - glutamic acid ( sde ) , which existes in the cooh - terminal end of the seven repeats in the ligand binding domain of the ldl receptor and plays an important role in identifying ldl , was synthetized and immobilized onto the polyacrylamide ( paam ) beads as a bionic adsorbent for selective removal of ldl from plasma 本论文以丝氨酰-天冬氨酰-谷氨酸( sde )负电性三肽(此三肽广泛存在于ldl受体配体结合域7个重复序列的羧基末端，对ldl受体特异性识别ldl起着重要作用)作为配体固定到聚丙烯酰胺微球载体上制成仿生性ldl亲和吸附剂，考察其对人血浆中ldl及hdl的吸附功效。
