酮体

We successfully improved the methods of departing O-methyl using boron tribromide, of isolating hydrogen bromide byα-chloro-ethyl chloroformate, and of related in synthesis of natrexone, new medicine, using boron tribromide. This resulted in generation of hydrogen cyanide becoming impossible.

改进了以氯甲酸-α-氯乙酯脱代替溴化氰以及改进的三溴化硼法作为新药纳曲酮合成中相应的方法，去除了合成过程中产生氰化氢气体的可能性。

Triton-X100 has little effect on fermentation, but span-20 and β-ionone could enhance the productivity of lycopene significantly.

研究了不同小分子效应物对三孢布拉氏霉菌合成番茄红素的影响，结果表明：trinton-X100对菌体中番茄红素含量影响较小，span-20、β－紫罗酮和异烟肼可以提高番茄红素的产量，其中添加span-20可使番茄红素产量提高3倍。

This dissertation was designed to study heteto-phase grafting polymerization of vinyl acetate , maleic anhydride and VAC/MAH binary monomer system, irrespectively, with low density polyethylene film as substrate and benzophenone as photoinitiator. The purpose is to develop new and more effective methods to modify the surface and buck properties of polyolefines by studying the grafting mechanism of the system and exploring the characteristics of the grafting process.

本文主要以低密度聚乙烯膜为基体膜，以二苯甲酮为光引发剂，分别对醋酸乙烯酯、马来酸酐以及VAC/MAH的非均相接枝聚合反应进行了系统研究，以探讨相关的接枝反应机理、接枝反应过程以及接枝工艺的可行性，目的在于建立聚烯烃材料本体和表面改性新方法。

Hydroxyl ketene dithioacetals were treated under diversely catalyzed conditions, and a wide range of significant compounds and synthetic precursors thus were obtained.

羟基二硫缩烯酮类化合物可以通过各种不同的反应条件进行多种转化，能够获得许多有意义的化合物和合成潜体。

Degradation products had an apparent characteristic absorption peak at 520 ran, which was caused by the keto form for STCP.

降解产物在525nm处出现的特征峰是STCP的异构体吡啶酮类化合物引起的。

About the identity of the limonene in your sample.

讨论一下香芹酮对映体的鉴定对你样品中柠檬烯的鉴定有什么启示。

Meno pause occurs when the ovaries gradually lose the ability to produce estrogen and progesterone, the hormones that govern the menstrual cycle .

当卵巢渐渐失去分泌雌激素和黄体酮——控制月经周期的荷尔蒙——的能力时，更年期就来了。

Objective:To investigate the effects of progesterone on nasal mucosa in acute rhinitis rat models.

目的：研究黄体酮对SD大鼠急性鼻炎模型鼻腔黏膜上皮的影响。

Methods Making 20% bleaching water solution by using 10% CP with Carbopol or PVP as carriers and 10% Opalescence. Experiment rats were perfused the bleaching solution by 5ml/kg via oral route continually for seven days, control rats were perfused distilled water according to equal standard, then combine clinical signs, food utilization rate and pathology to evaluate the short term systemic toxicity of the lab rats.

将以卡波姆或聚乙烯吡咯烷酮为增稠载体的10％CP和10%Opalescence漂白凝胶制备成20%的水溶液，实验组白鼠按5ml/kg经口途径给服，对照组按同等标准给服等量蒸馏水，持续7天，通过临床体征、食物利用率、体重相对增长率以及病理表现来评价受试材料的短期全身毒性。

Result shows that enunciation weight of the the big youth pantheress rat of variety variance does not obvious, and has certain impact role on the spleen, thus may affect its immunity function.

实验结果表明，大豆异黄酮对青年雌性大鼠体质量的影响不显著，脏体比结果表明对脾脏可能有一定的影响，从而可能影响其免疫功能。

On the other hand, the more important thing is because the urban housing is a kind of heterogeneity products.

另一方面，更重要的是由于城市住房是一种异质性产品。

Climate histogram is the fall that collects place measure calm value, cent serves as cross axle for a few equal interval, the area that the frequency that the value appears according to place is accumulated and becomes will be determined inside each interval, discharge the graph that rise with post, also be called histogram.

气候直方图是将所收集的降水量测定值，分为几个相等的区间作为横轴，并将各区间内所测定值依所出现的次数累积而成的面积，用柱子排起来的图形，也叫做柱状图。