乙酸的

The adsorption for phenylacetic acid on AH resin is the coefficient result with physical adsorption and chemical adsorption.

苯乙酸在AH树脂上的吸附是物理吸附和化学吸附共同作用的结果。

The extraction of Pr3+was studied by using heptane containing bis(2-ethylhexyl)phosphinic acid in sodium perchlorate,chloroacetic acid and citric acid medium ,respectively.

研究了二(2-乙基己基)膦酸(PIA-8)的庚烷溶液分别在高氯酸钠、氯乙酸、柠檬酸介质中对Pr3+的萃取。

The catalyst was characterized by XRD,no apparent characteristic peaks of phosphotungstic acid are observed,which indicates that heteropoly acid dispersed finely in the molecular sieves,and the structure of ZSM-5 was not destroyed.

将催化剂用于合成乙酸乙酯，探讨了操作条件包括原料组成，催化剂用量和反应时间对酸转化率的影响并与浸渍方法得到的催化剂进行重复使用性能比较。

The synthetic route starts from penicillin G, peroxyacetic acid(8.5%) as Oxidizing Agent to get penicillin G sulfoxide; esterifided with p-nitrobenzyl bromine to synthesize penicillin G sulfoxide ester; we synthesize 3-exomethylenecepham sulfoxide ester with phthalimide potassium and 4A molecular sieve as acid scavenger to open the ring, SnCl_4 as catalyzation to close the ring. The yield is over 60%.

本研究采用的合成路线为：以青霉素G钾盐为原料，选用工业过氧化氢制备的过氧乙酸(22.3%)稀释至8.5%为氧化剂，氧化得青霉素亚砜；采用对硝基溴苄为酯化试剂，制备青霉素亚砜酯；以NCP(N-氯代邻苯二甲酰亚胺)为开环试剂，酞酰亚胺钾和4A型分子筛为酸清除剂，顺利开环；再经无水SnCl_4催化闭环得3-环外亚甲基头孢亚砜酯，最终产率在60%以上。

According to the result showed at 280nm and at 490nm,in the comparison of whether protein absorption top and sugar quantity top overlapped,glycoproteins would be detected preparatorily,and as a result,tubes in two distinct areas had glycoproteins by this method. Proteins were precipitated with trichloroaceticacid and with cold acetone,and glycoprotein was determined from SDS-gel.

再从各收集管的收集液中，用三氯乙酸沉淀蛋白法、冷丙酮沉淀蛋白法相结合浓缩、制备蛋白样品，进行SDS—PAGE，对SDS胶进行PAS糖链染色鉴定糖蛋白，并从茶树叶分级蛋白中准确地鉴定出两个区域的收集管中含有多种糖蛋白。

The colon temperatures were measured by a thermistor and the cytosolic free calcium concentration ([Ca2+]i) in dissociated brain cells was measured by Fura 2-AM. The results demonstrated that the pyretic action of egtazic acid (0.6 μmol, icv) was markedly inhibited by DEX (5 mg/kg,iv), but DEX (60-120 μmol/L) did′t affect [Ca2+]i in dissociated hypothalamus cells. Actinomycin D, which interferes with gene transcription (3 nmol, icv), completely abolished the antipyretic action of DEX on egtazic acid-induced fever.

结果发现：脑室灌注乙二醇双(2-氨基乙醚)四乙酸(0.6 nmol)引起家兔结肠温度明显升高，静脉注射地塞米松(5 mg/kg)显著抑制家兔乙二醇双(2-氨基乙醚)四乙酸性发热，地塞米松(60-120 μmol/L)并不影响下丘脑细胞内[Ca2+]i，而事先脑室灌注抑制基因转录的放线菌素D(3 nmol)则完全取消了地塞米松对乙二醇双(2-氨基乙醚)四乙酸性发热的解热作用。

At the initial isolation to the extract from ethyl acetate, tow kinds of crystal a and b with higher purity were found, and the primary components were 98.45%. Quinic acid and 69.34% L-Proline, 5-oxo-, methyl ester.

在乙酸乙酯部分进行初次分离时，还得到了两种纯度较高的晶体a和b，经GC-MS分析可知其主要成份分别为98.45%奎宁酸和69.34%的5-脯氨酸甲酯。

The main organic acid was citric acid, followed by malic acid. Citric acid and tartaric acid levels increased during storage. Malic acid and quinic acid increased from stage one to stage two. Shikimic acid level increased from stage one to stage three, then decreased slightly. Acetic acid changed unremarkably. Succinic acid changed not significantly from stage one to stage two, then increased and it was the highest in the stage three. The level in stage four and stage five was lower than the level in stage three.

五九香梨果实中的主要有机酸是苹果酸和柠檬酸，整个贮藏期间，柠檬酸和酒石酸含量处于上升趋势，苹果酸和奎宁酸含量在第一、二月贮藏期间增加，而后开始下降；莽草酸含量在贮藏期第一到第三阶段上升，而后略下降；琥珀酸含量在第一到第二阶段变化不明显，接着有上升的趋势，在第三阶段含量达到最高，第四和第五阶段略低于第三阶段；乙酸含量变化不明显。

In addition, dichloromethane-methanol-acetic acid (60: 30: 10, V/V) is selected as regenerant and the appropriate regeneration condition is also established by evaluation of the regeneration effciency.

此外，通过对再生效率的考察，寻找到二氯甲烷—甲醇—乙酸（60：30：10，V/V）为再生剂及合适的再生条件。

Those results indicated that addition of surfactant Tween 20 and Tween 80 may regulate the ruminal fermentation by stimulating cellulose degradation and acetic add production.

以上结果提示：非离子表面活性剂Tween 20和Tween 80主要通增加纤维素在前胃的消失率和乙酸生成的途径对瘤胃发酵进行调控。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。