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Preliminary bioassay showed that most of title compounds had better herbicidal activity,for example,5a,5b,5c,5e,5f and 5g exhibited more than 80% inhibition to broad-leaved weeds,such as Abutilon theophrasti,Chenopodium album L.,Amaranth...

初步生物活性测定结果表明，该类化合物对阔叶杂草具有较好的芽后除草活性，如5 a、5b、5 c、5 e、5 f、5g等化合物在75 g/hm2剂量下，茎叶处理对苘麻、藜、凹头苋等阔叶杂草的抑制率达80%以上。

Preliminary bioassay showed that most of title compounds had good herbicidal activity, for example, 9a, 9b, 9c, 9f, 9g and 9h exhibited more than 90% inhibition aganist dicotyledon weeds, such as Abutilon theophrasti Medic and Amaranthus spinosus at an active ingredient 75 g/hm2 in post-emergence treatment.

初步生物活性测定结果表明，该类化合物具有一定的除草活性，如9a， 9b， 9c， 9f， 9g和9h在有效成分75 g/hm2剂量下，茎叶处理对苘麻、刺苋等双子叶杂草的抑制率达90%以上。

Whole series of organic compounds, among them acetaldehyde, acetic acid, and acetic

对于整个系列的有机化合物，包括乙醛、乙酸

Two compounds were isolated from ethyl acetate extract of the fermentation of fungus 07-11,which obtained from the soil of Yunnan Province. They were identified as N-(4-hydroxy-2-methoxyphenyl)acetamide (1) and ergosta-7,22-diene-3,6-dione (2) respectively on the basis of spectral analyses and physical and chemical identifications.

从云南土壤真菌07-11号菌株的发酵液乙酸乙酯萃取物中分离得到2个化合物，通过理化鉴别和光谱测定，鉴定两化合物分别为N-(4-羟基-2-甲氧苯基)乙酰胺(1)和麦角甾7，22-二烯-3，6-二酮(2)。

Receive substitution of an acetyl group; of chemical compounds.

得到乙酰基的替代品；化学混合物。

We shall look at two compounds, salt and sulphuric acid, work horses of the chemical industry.

我们将讨论盐和硫酸这两种化合物——化工中的两大"支柱"。

Humic acid in soil plays an important role in transfer of hydrophobic organic compounds such as polycyclic aromatic hydrocarbons.

土壤腐殖酸的吸附作用对多环芳烃等疏水性有机污染物的迁移产生影响。

Through the steps such as acidify, filteration, extraction , distillation and vacuum distillation, the product is seperated from compounds.

通过酸化、过滤、萃取、常压蒸馏和减压蒸馏等后处理手段，将产物分离出来。

The extraction behaviors of actinides and the main fission products by the above compounds were studied.

较为系统研究了该化合物作为锕系元素萃取剂对锕系元素和主要裂片元素的萃取性能。

They are also considered as synthetic intermediates for the construction of numerous cyclic and acyclic compounds.

在合成化学中，有机化学家也常常通过它们作为合成复杂天然或非天然产物的关键中间体。

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。