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Methods The chemical constituents were isolated and purified by silica gel column chromatography and identified on the basis of their physiochemical and spectral data.

方法利用硅胶色谱分离纯化马银花根的化学成分，根据化合物的理化性质和光谱数据鉴定化合物的结构。

The chemical constituents was separated and identified by physiochemical and spectroscopic analysis.

方法用柱色谱法进行分离纯化，通过理化性质和波谱数据分析鉴定其化学结构。

Ten insecticidal constituents of T. wilfordii were isolated by means of phytochemistry combined with bioassay method.

采用生物活性追踪和化学分离相结合的方法，对雷公藤根皮中的杀虫活性成分进行了系统的研究。

Results: Seventeen fatty acids compounds, three sterols and one phytol were identified from p. alatum Buch.-Ham., amounting to 67.22% of the total constituents, linolenic acid,linoleic acid and palmic acid were the main compounds.

结果：从头状蓼中分离鉴定了17个脂肪酸成分，3个甾醇类成分和植醇，占色谱总出峰面积的67.22%，主要成分为亚麻酸，亚油酸和棕榈酸。

Objective］ The research aimed to optimize the extraction process of volatile oil from the pine needle of Pinus massoniana and analyze the constituents of volatile oil.

［目的］优选马尾松松针挥发油的最佳提取工艺，并对挥发油中化学成分进行分析。

Results64 kinds of constituents in the volatile oil were identified from Amonun krauanh Pire ex Gagnep and their relative areas were above 95% among the total peak areas.

结果从白豆蔻挥发油中鉴定了64个化合物，占馏出峰峰面积的95%以上。

Two complexing agents and one inhibitor were selected as slurry constituents for detailed chemical synergistic effect study because they showed good materials removal and surface planarity performances.

经过分析和比较最终的平坦化效果，确定两种配位剂和一种抑制剂作为抛光液的成分。

Aim To study the chemical constituents of Rhododendron ovatum Planch.

目的研究马银花的化学成分。

The constituents of bulb of F. puqiensis were studied. Five steroid alkaloids were isolated. The plane structure and stereoscopic configuration of 4 compounds were elucidated. They are named as puqienine A (FP-33), puqienine B (FP-3), N-demethyl-puqietinone (〓 FP-34) and puqietinone (〓, FP-9). Puqienine A and N-demethyl-puqietinone are new compounds. Puqienine B is as same as FPQ-3 elucidated by Prof.

对F.puqiensis鳞茎化学成份进行了研究，分得5个甾体类生物碱成分，并采用 UV、IR、EI-MS、1D-NMR，HHCOSY、CHCOSY、HMBC和X-RAY等光谱技术和理化常数测定，鉴定出4个化合物的平面结构和立体构型，分别为蒲圻贝母碱甲（puqienineA，FP-33）、蒲圻贝母碱乙（puqienineB，FP-3）、N-去甲蒲贝酮碱（N-demethyl-puqietinone，FP-34）和蒲贝酮碱（puqietinone，FP-9），其中蒲圻贝母碱甲和N-去甲蒲贝酮碱为新化合物。

This paper studied the effects of foliar spraying of amino acids and chitosan on plastid pigment, enzymatic activity and aroma constituents of flue-cured tobacco leaves after topping.

本文研究了叶面喷施氨基酸和壳聚糖对烤烟烟叶质体色素含量、酶活性的变异以及对致香物质含量的影响。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。