酸基

After the above agent all the hypothesis of the optimization assembly, versus dynamic variance that different the growing period air ratio was studied, the air proportion affecting organisms used in two-step fermentation process and decide the air proportion for different cultivating period and investigate to what extent air may affect the organisms used in two-step fermentation process so that the fair term was created for 2- keto -L- gulonic acid of the accumulation.

在以上因素都优化组合的前提下，对不同生长期空气比的动态变化研究，确定了混合菌培养过程中，根据实际单罐批的生长情况，优化控制空气比可以协调巨大芽孢杆菌﹑氧化葡萄糖酸杆菌之间关系，为2-酮基-L-古龙酸的积累创造良好的条件。

It consists of 7 transmembrane α-helices, and each is about 25 residues in length.

腺甘酸A2A受体在结构上由7个α－螺旋组成，每一个螺旋的长度大约为25个胺基酸的长度。

Lignin based polyurethane films were prepared by solution casting from hydroxypropyl lignin derivatives and hexamethylene diisocyanate or toluene diisocyanate.

以羟丙基化木素和甲苯二异氰酸酯或六亚甲基二异氰酸酯为原料，采用溶液流延法制备了聚氨酯。

And while at pH=4-8, the dosage of combined collector reached 500g/t and the ratio of benzyl malonic acid and hydroximic acid is 2︰8, the flotation recovery of hematite reached its maximum of 95.6%.

当组合药剂用量为500g/t、矿浆pH值为4~8、苄基丙二酸︰C5-9羟肟酸=2︰8时，赤铁矿回收率达到最大值，为95.6%。

When the dosage of combined collector is 1000g/t and the ratio of benzyl malonic acid and hydroximic acid is 4︰6, on the condition of pH=7-9, the maximal flotation recovery of calamine was gained which was 75.6%.

当苄基丙二酸︰苯甲羟肟酸=4︰6、矿浆pH值为7~9、组合药剂用量为1000g/t时，菱锌矿回收率达到最大值，为75.6%。

In the forth part, in the presence of chiral phosphoric acid, highly enantio-enriched (up to 98% ee)α-aryl glycine derivatives could be synthesized via asymmetric transfer hydrogenation of the α-aryl imino esters using Hantzsch ester as the hydrogen source.

第四部分工作中，利用Hantzsch酯作为氢源，高对映选择性地实现了手性磷酸催化芳基酮酸酯亚胺的不对称仿生氢化反应，以最高98％的对映选择性得到苯甘氨酸衍生物。

Is a research and development, production, trade and service-based economy of foreign trade entities, chemical raw materials to the professional operation of the main company's existing production of AC blowing agent, ferric chloride, hydrated Hydrazine, p-nitrophenol, m-phenylenediamine, phosphorus trichloride, phosphorus oxychloride, 2,4 - diamino benzene sulfonate, sodium dichloro isocyanurate, N-methyl-o-phenylenediamine Second hydrochloride fine chemical products such as the ability, and are obtained ISO9001 international quality system certification.

济南华尔沃进出口贸易有限公司是一家集研发、生产、贸易、服务于一体的外贸型经济实体，以专业经营化工原料为主，公司现有生产AC发泡剂、三氯化铁、水合肼、对硝基苯酚、间苯二胺、三氯化磷、三氯氧磷、2，4—二氨基苯磺酸钠、二氯异氰脲酸钠、N-甲基邻苯二胺二盐酸盐等精细化工产品的能力，并且均以取得ISO9001国际质量体系认证。

HBPSi to join after, HBPSi of epoxy groups can triazine ring into isocyanuric acid ester, isocyanuric acid ester and then with epoxy to form one oxazoline (see signal-1a), To reduce the stiffness of the resin network.

加入HBPSi后，HBPSi的环氧基团可使三嗪环转化为异氰脲酸酯，异氰脲酸酯进而与环氧基反应生成噁唑啉酮（oxazolidinone rings(见示意式1a)，降低了树脂网络的刚性。

A reversed-phase high performance liquid chromatographic method was established for determination of isothiocyanates in human urine , which used the reaction of propyl isothiocyanate with 1,2-benzenedithiol as reference instead of the synthesis of 1,3-benzodithiole-2-thione.

省去合成1，3 苯二硫杂环五烯 2 硫酮这一步骤，直接用异硫氰酸丙基酯与1，2 苯二硫酚反应作标准，建立了尿液中异硫氰酸酯的反相高效液相色谱测定方法。

Such structural complexity is further enhanced by O-acetylation, esterification, lactonization, as well as other forms of substitutions, reflecting significance of carbohydrates in cell recognition.

细胞表面上糖缀合物的糖链经常以多/寡聚体形式存在，并且结构复杂，常常大量表达唾液酸、糖醛酸、硫酸化糖基等酸性糖，并发生O-乙酰化、酯化和内酯化等修饰。

With Death guitarist Schuldiner adopting vocal duties, the band made a major impact on the scene.

随着死亡的吉他手Schuldiner接受主唱的职务，乐队在现实中树立了重要的影响。

But he could still end up breakfasting on Swiss-government issue muesli because all six are accused of nicking around 45 million pounds they should have paid to FIFA.

不过他最后仍有可能沦为瑞士政府&议事餐桌&上的一道早餐，因为这所有六个人都被指控把本应支付给国际足联的大约4500万英镑骗了个精光。