查询词典 butanolide

Based on minor structural difference in the C-2 side chain, these autoregulators chemically identified to date can be classified into three types: the A-factor type, the virginiae butanolide type and the IM-2 type.

根据该类自动调控因子C-2位细微的结构差别分为三种类型，分别为A因子型、VB型和IM-2型。

Based on minor structural difference in the C-2 side chain, these autoregulators chemically identified to date can be classified into three types: the A-factor type, the virginiae butanolide type and the IM-2 type.

γ-丁酸内酯自动调控因子是一种由链霉菌产生的被称为微生物&激素&的小分子化合物，它控制着链霉菌次级代谢物的产生或形态分化。

In order to study strcture-bioactivity relationship concerning α,β-unsaturated-γ-lactones, we further synthesized γ-benzyloxymethy-γ-butanolide XXIII and the corresponding unsaturated buteno- lido XXV Scheme 6, p.

为了研究该类化合物的构效关系，在本论文第三部分，我们进一步设计并合成了--γ-苄氧基甲基-γ-丁内酯XXIII和--γ-苄氧基甲基-γ-丁烯内酯XXV这两个内酯化合物，目的是想考察内酯的α，β-不饱和双键是否是产生细胞毒性的关键结构。

Preliminary bioassay: Compounds I, VI, VII, XXIII and XIVshowmoderate cytotoxicities against Ehrlich tumor cells (〓 30-40μ g/ml), while compound 1 exhibites stronger activity (〓 10.5μ g/ml). Saturated butanolide was almost inactive.

化合物Ⅰ、Ⅵ、Ⅶ、ⅪⅤ和XXⅢ的初步生理活性试验表明，它们均对艾氏腹水瘤细胞表现有中等的细胞毒性，其〓大多在30～45微克／毫升之间，含有双键的不饱和内酯Ⅰ和XIV有较好的活性，其中尤以Ⅰ的活性最强，〓为10.5微克／毫升。

The absorption and distribution of chromium were studied in ryeusing nutrient culture technique and pot experiment.

采用不同浓度K2CrO4(0，0.4，0.8和1.2 mmol/L)的Hoagland营养液处理黑麦幼苗，测定铬在黑麦体内的亚细胞分布、铬化学形态及不同部位的积累。

By analyzing theory foundation of mathematical morphology in the digital image processing, researching morphology arithmetic of the binary Image, discussing two basic forms for the least structure element: dilation and erosion.

通过分析数学形态学在图像中的理论基础，研究二值图像的形态分析算法，探讨最小结构元素的两种基本形态：膨胀和腐蚀；分析了数学形态学复杂算法的基本原理，把数学形态学的部分并行处理理念引入到家实际应用中。