醚提取物

The content of carotenoid and petroleum ether extract reduced at three months of aging and then increased.

类胡萝卜素和石油醚提取物含量在陈化三个月时降低，之后上升。

Objective To study the antitumor effects of the petroleum ether extract from Stellera Chamaejasˉmel L.

目的研究瑞香狼毒石油醚提取物的抗肿瘤作用。

Key words stellera chamaejasmel L. the petroleum ether extract MTT antitumor activity in vitro in viˉvo

瑞香狼毒石油醚提取物具有较强的体内和体外抗肿瘤作用。

The analgesic active substances of Meconopsis quintupcinervia Regel contain in ethanol extract mainly, then in petroleum ether extract.

五脉绿绒蒿的镇痛活性物质主要存在于乙醇提取物中，其次是石油醚提取物。

Among the five extracts, petroleum ether extract had the strongest contact toxicity and the adjusted death rates were 66.65% and 92.21% 24 h and 48 h after treatment with the concentration of 100 mgmL^(-1) and the LD50 were 76.07 mgmL^(-1)、14.94 mgmL^(-1) respectively.

其中，以石油醚提取物的触杀作用最强，处理后24、48h的校正死亡率分别为66.65%和92.21%，LD50分别为76.07、14.94mgmL^(-1)。

The acaricidal activity of the extracts of n-butanol and distilled water were not detected in this test.

其中丁香石油醚提取物杀螨活性最为突出，是丁香的主要杀螨活性部位。

The exact of petroleum ether was the acaricidal active site of Eungenia caryophyllata. 3.Isolation, purification and identification of compounds with acaricidal activity in Eugenia Caryphyllata: The exact of petroleum ether was separated into 6 parts by silica gel column chromatography with gradually increasing polarity of petroleum ether: ethyl acetate. The part C was demonstrated to be the most effective part by acaricidal activity test in vitro,and the time for it to kill all experimental mites was about 20 min.

丁香杀螨活性成分的追踪分离、纯化与结构鉴定：采用硅胶柱层析法，以石油醚：乙酸乙酯溶剂系统梯度洗脱，对丁香石油醚提取物进行分离，得到A~F 等6 段混合物，离体杀螨试验发现，C 段混合物具有突出的杀螨活性，50%浓度平均15min可杀死全部供试螨虫。

Among the 8 herbal extracts, petroleum ether extract of Inula britanica L.

根据杀螨活性初筛结果，选取这3种触杀活性较高的中草药提取物进行毒力活性测定结果为：旋覆花石油醚提取物的LCS。

The repellent action and contact action of the extracts of 21 species of plants to adult maize weevil, Sitophilus zeamais Motschulsky were studied.

为了筛选对粮库安全的植物源杀虫剂，研究了21种植物的4种溶剂(无水乙醇、丙酮、乙酸乙酯和石油醚)提取物对玉米象Sitophilus zeamais Motschulsky的驱避和触杀作用。

The contents of carbonaceous compounds, such as soluble saccharide, petroleum ether extract and volatile acid in mellow leaves were higher than in overripe leaves, but nitrous compounds, such as nicotine, total nitrogen, volatile alkali, in mellow leaves were lower than in overripe leaves.

过熟烤烟烟叶除葡萄糖含量变化不明显外，果糖、麦芽糖、蔗糖等水溶性糖和石油醚提取物、总挥发酸及钾含量均大幅度降低；而氮、烟碱、挥发碱和挥发碱／烟碱等重要化学指标明显升高。

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。