cholestane

cholestane的基本解释

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[化] 胆甾烷

与cholestane相关的网络例句 [注：此内容来源于网络，仅供参考]

The second route firstly studied the tautomerization of the key intermediate from spirostane to cholestane 3-O-substituted kryptogenin,then formed a direct access used Zn/KI/HOAc reduction,which supplied a better synthetic method of MPD and other furostanol saponins.

第二条路线则首先研究了由螺甾到胆甾结构的关键中间体3-O-substituted kryptogenin的异构化现象，建立起以Zn/KI/HOAc还原反应直接合成该中间体的过程，这提供了一个更好的合成甲基原薯蓣皂苷及其他呋甾皂苷的方法。

Two pathways of cleavage and conversion in ring B of ergostane and cholestane are summarized.

第二部分总结了麦角甾烷及胆甾烷B环裂解和转化的两种途径。

The steroids of cholest 4 ene 3 one and cholestane 3,6 dion in Yisheng Capsules were determined by capillary gas chromatography. The results provide a reference to work out its quality standard.

采用毛细管气相色谱法测定了益肾胶囊中胆甾-4-烯-3-酮、胆甾-3，6-二酮的含量，为该制剂制度质量标准提供了参考依据。

The biomarkers such as the n-Alkanes, the isoprenoids, the terpane, and cholestane were detected through GC-MS analysis. Based on the study of the biomarkers, the biological evolution during Permian and Triassic can be divided as three stages, namely, the mixing source stage of low biota such as thallose and advanced plant in late Permian (below bed 63), the stage of low biota such as thallose in the boundary transitional layer (bed 63-69) and the mixing source stage of advanced plant and low biota such as thallose in early Triassic (above bed 69). What's more, the second stage near the boundary transitional layer can be subdivided into 4 stages. The stages of biota evolution is close related with sedimentary environment changing and the boundary transitional layer.

利用GC—MS分析技术，在陆相地层中检测出正构烷烃、类异戊二烯烷烃、萜烷和甾烷类生物标志化合物并根据生物标志化合物和特征值研究，将二叠系—三叠系生物演化划分为三个大的阶段，即晚二叠世的菌藻类低等生物与高等植物混源阶段（63层以下），界线异常层的菌藻类低等生物阶段（63-69层）和早三叠世高等植物与菌藻类低等生物混源阶段（69层以上），界线附近异常层的第二阶段又进一步细分为4个次一级阶段，生物演化阶段与沉积环境变化及界线异常层具有非常密切关系。

与cholestane相关的网络解释 [注：此内容来源于网络，仅供参考]

cholestane：胆甾烷

释文:一组不对称异构多环环烷烃的总称,具有旋光性,包括有胆甾烷(cholestane)、麦角甾烷(ergostane)和谷甾烷(sitostane)等. 在沉积物和原油中已经找到许多甾烷(还有甾烯),显然是生物中的甾族(甾醇)化合物转化而来的.