查询词典 esters

The sinapate esters have greater UV-B attenuation and antioxidant activity than flavonoids.

拟南芥苗中还含有高浓度的黄酮和较高比例的五羟黄酮及4，5，7-三羟基黄酮衍生物。

In leaf tissue of Arabidopsis, the most abundant hydroxycinnamic acidphenolics are sinapate esters, and the most abundant flavonoids are kaempferol derivatives.

拟南芥药用成分主要有酚类化合物，即羟基苯丙烯酸酚类化合物的芥子酸酯，黄酮类化合物的4，5，7-三羟基黄酮衍生物，芥子酸酯与这种黄酮类化合物具有优良的减少紫外线危害和抗氧化作用。

Phenolics showed reduced accumulation of sinapic esters in LAC1 seedlings.

而且分泌的GaLAC1 可降解三氯苯酚。一条新的技术路线。

Differential Scanning Calorimetry and Small Angle X-ray Diffractometry were used to characterize the phase transitions in lamellar liquid crystal systems containing water, alkyl polysorbates, sorbitan esters, stearyl alcohol and oil. The order-disorder transition temperatures of the gelled O/W and W/O globular onion lamellar phases L(subscript O1) and L(subscript O2) and planar gelled lamellar phase L(subscript β) were measured as a function of system compositions.

采用示差扫描量热法和小角X射线衍射测试技术表征了由聚氧乙烯醚失水山梨糖醇脂肪酸酯、失水山梨糖醇脂肪酸酯、直链脂肪醇和挥发性物质组成的层状液晶体系的相转变特性，测定了水包油和油包水球形洋葱层状液晶L(下标 O1)和L(下标 O2)及平面层状液晶L的有序－无序的转变温度与体系组成之间的关系。

The present invention concerns the compounds having the formula N-oxides, salts, stereoisomeric forms, racemic mixtures, prodrugs, esters and metabolites thereof, wherein R1 and R8 each are H, optionally substituted C1-6alkyl, C2-6alkenyl, C3-7cycloalkyl, aryl, Het1, Het2; R1 may also be a radical of formula (R11aR11b)NC(R10aR10b)CR9-; t is 0, 1 or 2; R2 is H or C1-6alkyl; L is -C-,-O-C-,-NR8-C-,-O-C1-6alkanediyl-C-,-NR8-C1-6alkanediyl-C-,-S2-,-O-S2-,-NR8-S2 ; R3 is C1-6alkyl, aryl, C3-7cycloalkyl, C3-7cycloalkylC1-4alkyl, or arylC1-4alkyl; R4 is H, C1-4alkylOC, carboxyl, aminoC, mono- or di(C1-4alkyl)aminoC, C3-7cycloalkyl, C2-6alkenyl, C2-6alkynyl or optionally substituted C1-6alkyl; R5 and R6 are H or C1-6alkyl.

本发明涉及右式化合物其N-氧化物、盐、立体异构形式、外消旋混合物、前药、酯及代谢物，其中R 1 及R 8 各是氢、C 1-6 烷基、C 2-6 烯基、C 3-7 环烷基、芳基、Het 1 、Het 2 ；R 1 也可以是式(R 11a R 11b )NC(R 10A R 10b )CR 9 -之基；t是0、1或2；R 2 是氢或C 1-6 烷基；L是-C-、-O-C-、-NR 8 -C-、-O-C 1-6 烷二基-C-、-NR 8 -C 1-6 烷二基-C-、-S 2 -，-O-S 2 -、-NR 8 -S 2 -；R 3 是C 1-6 烷基、芳基、C 3-7 环烷基、C 3-7 环烷基C 1-4 烷基或芳基C 1-4 烷基；R 4 是氢、C 1-4 烷基OC、羧基、氨基C、一-或二(C 1-4 烷基)氨基C、C 3-7 环烷基、C 2-6 烯基、C 2-6 炔基或任选被取代的C 1-6 烷基；R 5 及R 6 是氢或C 1-6 烷基。

The catalytic activity of the succinimide resin for hydrolysis of esters was studied.

并考察了该树脂在酯水解反应中的催化活性。

Two new active esters of acrylic acids monomers, N-p-acryloxybenzoyloxy succini-mide and N-p-methacryloxybenzoyloxy succinimide have been synthesized and polymerized.ABOSu and MBOSu were prepared by coupling of p-acryloxybenzoic acid or p-methacryloxybenzoie acid with N-hydroxy succinimide in the presence of dicyclohexylcarbodimide.

新的丙烯酸活性酯，N-(对甲基丙烯酰氧苯甲酰氧基)丁二酰亚胺及N-丁二酰亚胺单体分别由对甲基丙烯酰氧基苯甲酸、对丙烯酰氧基苯甲酸与N-羟基丁二酰亚胺在环已基羰二亚胺存在下经偶联反应合成。

Some typical newly catalysts, such as sulfoacid, inorganics, solid superacids, etc on the reaction of p-hydroxybenzoic esters was summed up especially introduce heteropoly acid catalyst.

总结了磺酸、无机物、固体超强酸等几种典型的合成对羟基苯甲酸酯反应的新型催化剂，重点介绍了杂多酸催化合成对羟基苯甲酸酯。

In our previous research, we found lithium ion played a crucial role on the stereoselective tuning of the cyclopropanation reaction of telluronium allylides with α,β-unsaturated esters or amides.

前述工作中，我们发现锂离子对烯丙型碲叶立德和 a ， b -不饱和酯、酰胺反应的立体化学控制起着重要的作用。

It is found that the stereochemistry of the reactions of telluronium allylide,crotonylide and trimethylsilyallylide with α,β-unsaturated esters and amides can be tuned by thechoice of reaction conditions.

利用反应条件的变化首次实现了烯丙基、巴豆基、含硅烯丙基碲叶立德与α，β-不饱和酯、酰胺进行环丙烷反应的立体化学调控，能高立体选择性地、高效率地合成两种不同几何异构体中的一个。

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。