查询词典 acetic acid

The hydrolysis of glycosidic linkages in hemicelluloses and the b-O-4 ether bonds in lignin are catalysed by acetic acid formed at high temperature from acetyl groups present in hemicelluloses.

水解糖苷联系，在半纤维素和波- 4甲醚债券木质素是催化乙酸形成于高温，从乙酰集团目前在半纤维素。

At the same time, these two methods of accuracy and precision compared. It is to answer why the majority of the conductivity method used to measure the reasons for the ionization constant acetic acid.

同时对这两种方法的准确度和精确度进行了比较，也回答了为什么大多数用电导率法来测HAc电离常数的原因。

Methods The models of the gastric mucosal injury induced by ethano l and acetic acid were used in rats.

用乙醇和醋酸烧灼致大鼠急、慢性胃粘膜损伤方法，观察胃宝冲剂5g/kg、2.5g/kg、1.25g/kg灌胃给药后对胃粘膜损伤的保护作用，并与胃苏冲剂比较。

Lappaconite hydrobromide was regarded as positive control medicine, and used acetic acid-induced test study the analgesic activity of different solvent extracts of Meconopsis quintupcinervia Regel.

采用加热回流法提取五脉绿绒蒿，以氢溴酸高乌甲素为中度以上镇痛阳性对照药，利用醋酸致小鼠扭体为指标，研究五脉绿绒蒿不同溶剂提取物的镇痛活性。

Molecular Formula and Molecular Weight : C27H32O14; 580.53Melting Point and solubility: When crystallized from water ,it contains 6 to 8 mol H2O, mp 83℃. After drying at 110℃ to constant weight, it contains 2 mol H2O, mp 171℃. Sol in methanol,alcohol, acetone, warm acetic acid,dil alkali and hot water.

熔点及溶解度：纯品柚皮甙中结晶水的含量及其熔点因结晶和干燥方法而异，以水作溶剂结晶所得柚皮甙分子中含6～8个结晶水，熔点83℃；而在110℃下干燥至恒重后得到的柚皮苷分子含有2个结晶水，其熔点升至171℃。

By simply stirring L-dopa methyl ester 1 and aldehyde 2 with anhydrous sodium acetate in acetic acid at room temperature for several hours, we obtained the desired 1, 3-syn compound 3 predominantly.

Et-743类似物的合成：由于化合物14 C-1位的保护基没能脱除，所以我们决定调整合成路线，采用了先将化合物13的C-1位的保护基脱除，再将C-21位羰基还原氰基化的策略。

Acetic acid equipments using material in PTA, PVA, aldehyde oxidation and methyl alcohol carbonyl synthetic four plants in chemical industry and chemical fibre production are analyzed.

对化工化纤生产中的精对笨二甲酸、聚乙烯醇、乙醛氧化生产醋酸与甲醇羰基合成醋酸4个装置醋酸设备用材进行分析，并对含Cl-、含Br-、含I-的醋酸及含Cl-的甲乙混酸对不锈钢、铜、钛与镍基合金等金属材料腐蚀原因作了讨论。

The conductivity and the molar conductivity of the ionic liquid in actone, water, DMF, acetic acid were investigated at different temperatures.

利用磷酸三丁酯与N-甲基咪唑在恒温150℃下一步合成了离子液体1-丁基－3-甲基咪唑磷酸二丁酯，考察了其在丙酮，水，DMF，乙酸溶剂中的电导率及摩尔电导率。

This research also indicated that (1) amount of total phenolic compounds, total flavones and percent of DPPH scavenging activity can be used as discriminate index for different kinds of vinegars,(2) new antioxidant may be formed during acetic acid fermentation period and decoction period, and be worth further researching.

本论文实验还表明：(1)总酚含量、总黄酮含量、DPPH自由基清除活性可作为不同种食醋的鉴别指标之一；(2)食醋酿造醋酸发酵阶段和煎煮过程中可能会生成一些新的具有抗氧化性的成分，可能值得进一步研究。

Nine kinds of vinegars and an acetic acid resolution were measured by the gas sensors array which were composed of ten doped nano-ZnO thick film sensors.

利用由10个掺杂纳米氧化锌厚膜气敏传感器组成的阵列对9种食醋和乙酸溶液进行了测量。

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。