酮体

It may be due to the following two reasons: 1 High steric hindrance caused by rigid structure of substituted fluorenone preventsthe approach of the chiral reductor;2 The prochiral center is, moreover, linked to two coplanar aromatic rings, which due to strong conjugation are highly electronically similar and thus it becomes extremely difficult to distinguish between them.

主要是以下两个原因：1取代芴酮的刚性结构产生高的空间位阻，阻止了手性催化剂的接近；2潜手性中心旁的两个芳香环不仅立体构型非常相似，而且高度的电子相似，很难被手性配体识别。

They said they found that progesterone, which is involved in the female reproductive cycle, stimulates the proliferation of breast cells carrying a gene linked to breast cancer, possibly feeding tumor growth.

他们说他们发现黄体酮，这一参与妇女生殖周期的激素，刺激携带与乳癌有关的基因的乳腺细胞的增殖。

Key wrds: hormone replacement therapy; breast cancer cells; progestin; estrogen-metabolizing enzyme; sulfatase; sulfotransferase

对于目前激素替代治疗中常用的孕激素安宫黄体酮是否可以通过影响雌激素代谢酶的活性而增加乳腺癌的危险性，尚有待于更深入的研究。

The results showed that the dithione R is the most stable tautomer of all the tautomers in the form of isolated or hydrated isomers.

计算结果表明， 2，6-二巯基嘌呤无论是孤立分子还是一水合物，其二硫酮式R是最稳定异构体。

Using tail-flick test and writhing test, the effect of intrathecal injection of yohimbine at different concentrations on the analgesic action of ketamine was observed.

用甩尾法和扭体法观察鞘内注射不同浓度的育亨宾对氯胺酮镇痛作用的影响。

LacZ gene was fused with the promoter of the acoR gene and bkdR gene, and two recombined genes were expressed in sigL mutant strain and HD-73 wild strain sequentially.

分别将调控aco操纵子（编码3-羟基丁酮脱氢酶系统）的转录调节基因acoR和调控bkd操纵子（编码催化支链脂肪酸合成的酶系统）的转录调节基因bkdR的启动子与lacZ基因融合，并转入出发菌株和sigL突变体中，测定b-半乳糖苷酶的活性。

A series of N -bonded donor-acceptor derivatives of phenothiazine containing phenyl, anisyl, pyridyl, naphthyl, acetylphenyl, and cyanophenyl as an electron acceptor have been synthesized.

合成了一系列的N10位取代的吩噻嗪给体受体衍生物，这些受体基团包括苯，苯甲醚，吡啶，萘，苯乙酮和苯甲腈。

The secretion of FSH and LH is pulsatile during the oestrus and anoestrus, the estrogens and progesterone is wavelike.

莱芜黑山羊在发情期和间情期，血浆内的卵泡刺激素和黄体生成素均呈脉冲式分泌，雌激素(E2)和孕酮为波动式分泌。

METHODS: The pregnant mice were administered by oral gavage with MXC at different doses of 0, 20, 100 and 200 mg/kg during day 12-17 of pregnancy. Meanwhile, other pregnant mice as a control group were gavaged sesame oil solvent in the same manner. The changes in body mass and number of corpora lutea of the pregnant mice were observed; and the body mass and anogenital distance of their F1 foetuses were recorded, too. The concentrations of estradiol (E2 ) and progesterone in sera of the pregnant mice were determined using radioimmunoassay.

将交配成功的雌鼠于孕12～17 d每日给予不同剂量的MXC(0，20，100，200 mg/kg)灌胃，并设芝麻油溶剂为对照组，观察各组孕鼠体质量和黄体等计数测定，同时观察各组F1子代仔鼠的体质量和肛门生殖器距离等，采用放射免疫法检测孕鼠血清雌二醇(E2)和孕酮含量。

Methods The molluscicidal efficacy of different concentration of endophyte JJ18 was detected according to the immersion test method recommended by WHO.The glycogen and protein of Oncomelania hupensis treated by endophyte JJ18 was determined by Anthrone and Kjeldahl method,respectively.

按照世界卫生组织的杀螺剂浸泡试验法观察不同浓度下JJ18发酵液提取物的灭螺效果，采用蒽酮显色法测定处理后钉螺软体的糖原含量变化，凯氏定氮法测定其蛋白质含量。

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。