化合

The broad scope and often orthogonal nature of these Pd-catalyzed halogenation reactions should make them a valuable synthetic tool for accessing a more diverse array of halogenated organic molecules.

正交性质和范围往往这些钯催化卤化合成反应应该是一个难得的工具存取更加各种卤化有机分子。

Up to now, the mechanism of singnal transduction involved in heterocyst differentiation is still unclear.

Anabaena PCC7120是一种丝状蓝细菌，在培养基中缺失化合态氮源的条件下，丝状体上分化形成异形胞执行固氮的功能。

The hexyl acetate was synthesized from n-hexanol and acetic acid by direct esterification.

以乙酸、正己醇为原料，直接酯化合成乙酸己酯，分别研究了反应温度、反应时间、原料配比、带水剂、催化剂用量等条件对合成反应的影响，确定了最佳工艺条件。

Recent progress and synthesis methods on direct hydroxylation of benzene to phenol are systematically introduced.

介绍了近年来苯直接羟化合成苯酚的研究进展和合成方法。

And it is considered that the reduction-oxidation method would be the optimum method for realizing in industry direct hydroxylation of benzene to phenol.

通过比较认为，氧化还原法是未来实现苯直接羟化合成苯酚工业化的优选方法。

The catalytic activity was characterized by the reaction of hydroxylation of phenol.

并用苯酚羟基化合成苯二酚作为探针反应，考察了TS-1膜的催化活性。

The synthesis process comprises using chiral phosphorus acid as catalysis, synthesizing 2-(4, 7-indoline) compound in high efficiency and highly enantioselective by using sulfur imide and 4, 7-indoline compound, and products can be used to prepare several 2-dimethylamino indoline compounds with high optical activity through oxidation reaction.

以手性磷酸作为催化剂，由磺酰亚胺和4，7-二氢吲哚化合物可以高效率高对映选择性的合成2-甲氨基(4，7-二氢吲哚)化合物；产物可以经过氧化反应用于制备多种高光学活性的2-甲氨基吲哚化合化合物。

He also says the drug appears to be most effective when given in combination with the older drugs.

他也说当这种药和以前的药化合的话会起到最好的效果。

The pigment in colored cotton fibers was extracted by methanol at room temperature. The results of color reactions HCl-Mg reaction, NaBH4 reaction, NaOH reaction, FeCl3 reaction and Pb(Ac2 reaction of the pigment extractive showed that the pigment extracted by methanol was flavone or flavonol with two adjacent hydroxide groups (Table 2, Fig. 1). The results of UV spectral analysis further proved that the pigment extracted by methanol from brown fiber belonged to flavone with two adjacent hydroxide groups in B ring, and that from the green fiber contained not only flavone but also flavonols with two adjacent hydroxide groups both in A ring and B ring and indican replaced a hydroxide group at 3-site of A ring Fig.

通过盐酸－镁粉反应、四氢硼钠还原反应、碱反应、醋酸铅反应、氯化铁反应和紫外光谱吸收的分析表明，甲醇室温提取的棕色棉纤维色素可能是黄酮类化合物，B环上带有邻二酚羟基；甲醇室温提取的绿色棉纤维色素除黄酮类化合物外，还含有3-位羟基被糖甙化的黄酮醇类化合物，A、B环上都带有邻二酚羟基。

Its subject coverage includes: combustion synthesis of ceramic, metal, intermetallic, and composite properties of products; and history and recent developments.

它的主题涉及的范围包括：燃烧合成的陶瓷、金属、金属间化合的与复合材料的产品特性；历史与最新发展。

Cynanchum Lingtai apricot production in the average weight 65 grams, the brightly-colored fruit, juicy rich, sweet-sour taste, sweet from the nucleolus, when the late Qing Dynasty famous Shaanxi, Gansu provinces, the Qing imperial court Tongzhi tribute for years.

灵台生产的牛心杏平均单果重65克，果实色泽鲜艳，汁多味浓，甜酸适口，离核仁甜，清末时就驰名陕、甘两省，清同治年间曾为朝廷贡品。

Chenopodium album,Solanum nigrum, and Amaranthus retroflexus were very susceptible to the herbicides. Polygonum persicaria and Abutilon theophrasti were relatively less susceptible to the herbicides, and Lycopersicon esculentum was not susceptible to it. The relationship between reduction rates of weed biomass and PPM values of weed leaves 2,4, and 6 days after treatment was established.

供试的6种杂草对该混剂的敏感性存在显著差异：红心藜Chenopodium album、龙葵Solanum nigrum和反枝苋Amaranthus retroflexus对该混剂最敏感，ED90值分别为47.65、71.67和29.17g/hm2；春蓼Polygonum persicaria和苘麻Abutilon theophrasti敏感，ED90值分别为96.91、114.20g/hm2；而番茄不敏感。