羟基

ABSTRACT Immobilized penicillin acylase (from E.coli) was used to catalyze 7 phenylacetamido 3 E propenyl cephalosporanic acid hydrolyzation into 7 amino 3 E propenyl cephalosporanic acid. Then, trans APRA was acylated with hydroxyethyl ester of 4 hydroxy D phenylglycine to obtain trans cefprozil.

以7 苯乙酰氨基 3 E 丙烯基 3 头孢菌素 4 羧酸为原料，在青霉素酰化酶作用下，首先酶法水解得到3 E 丙烯基 3 头孢菌素 4 羧酸，过滤固相酶，滤液调pH分离得到反式APRA固体；在青霉素酰化酶作用下，反式APRA再与对羟基苯甘氨酸乙二醇酯缩合，得到反式头孢丙烯；酶法合成所得的产品与进口反式头孢丙烯对照品一致。

The main results are as follows.1. The UV-visible absorption spectra, the spin-trapping EPR measurements, and the DPA (9,10-diphenylanthracene) bleaching experiments showed that (1) HB-Net exhibits much improved light harvesting efficiency in the phototherapeutic window (600-900 nm) as the result of its remarkable absorption red shift with respect to HB;(2) HB-Net remains the generation abilities of semiquinone anion radical, superoxide anion radical, hydroxyl radical, and singlet oxygen, but with much lower efficiencies than that of HB, most likely due to its very short triplet excited state lifetime.

设计合成了寡聚吡咯酰胺修饰的竹红菌乙素衍生物HB-Net，利用紫外-可见吸收光谱、自旋捕获技术和DPA光漂白法详尽比较了HB-Net与HB的光动力性质，发现：(1) HB-Net的吸收光谱较HB有显著红移，在光疗窗口的吸光能力明显提高；(2) HB-Net能够产生半醌负离子自由基、超氧负离子自由基、羟基自由基和单重态氧，但由于其短的三重态寿命，这些活性物种的产生能力均弱于HB.2。

The epoxy wax is a long-chain tallate of solo-hydroxyl and in one or two fatty acid or phytol chain of them contains one epoxide group and this chain of the fatty acid is better to contain one epoxide group at least.

蜡为长链单羟基醇的脂肪酸酯。环氧蜡为该脂肪酸或醇链中的一个或两个包含至少一个环氧基团的蜡，该脂肪酸链包含至少一个环氧基团较为合适。

Results Six compounds were obtained and their structures were identified as phytol, 7-hydroxycalamenene, daphnetin, and daucosterol from the alcohol extract, D-glycero-D-galacto-heptitol and D-erythro-L-galacto-octitol from the water extract.

结果 从其乙醇提取物中分离得到植物醇、7-羟基去氢白菖烯、瑞香内酯、胡萝卜苷；从其水提取物中分离得到两个多元醇类化合物，分别是D-glycero-d-galacto-heptitol、D-erythro-L-galacto-octitol。

With regard to the biological activities of paeonol and sodium paeonol sulfonate, we studied their inhibitory effects on phytopathogen and their activities of scavenging O2-and OH.

实验结果显示，丹皮酚磺酸钠的纯度为99.4804％，化学结构为2-甲氧基-4羟基-5-乙酰基苯磺酸钠。

Hydroxylcarveol(3) and its ester derivatives were synthesized from α-pinene(1), and their structures had been identified by IR, MS, 1H NMR and 13C NMR analysis.

以α-蒎烯(1)为原料，合成了8-羟基别二氢葛缕醇(3)及其甲酸酯(4)、乙酸酯(5)和丙酸酯(6)，并用IR、MS、1H NMR及13C NMR分析对它们的结构进行了表征。

The details of this route as follows:With the piperidine as catalyst, p-hydroxylbenzaldehyde condensed with thiazolidine-...

同时，本文还对反应过程中产生的5-乙基-2-乙烯基毗啶、5-乙基-2-羟乙基吡啶、5-[(4-羟基苯基)甲基]-2，4-噻唑烷二酮、5-4-

The polarographic behavior of 2, 4 - dihydroxybenzophenone was studied by linear - sweep polarography.

用线性扫描极谱法研究了2，4-二羟基二苯甲酮分别在B—R缓冲溶液中的极谱行为。

The polarographic wave of benzophenone-12 was studied by linear sweep polarography in different kinds of buffer systems.

用线性扫描极谱法研究了在不同缓冲体系中2-羟基-4-正辛氧基二苯甲酮(简称BP-12)的极谱行为。

And to discuss the development trend of hydroxyapatite/polymeric materials composites.

并对羟基磷灰石／聚合物复合材料的发展趋势进行了探讨。

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。