查询词典 methyl salicylate

The influence of reed produced allelopathy material eathyl-2-methyl acetoacetate on respiration action, photosynthesis action and antioxidant enzymes system of Microcystis aeroginosa were studied.

研究了芦苇产生的化感物质2-甲基乙酰乙酸乙酯对铜绿微囊藻呼吸作用、光合作用和抗氧化酶体系的影响。

N,N-Dihydroxyethyl-acetoacetamide,the raw material of the borate ester bonding agent,was synthesized from methyl acetoacetate and diethanolamine .

二乙醇胺与乙酰乙酸甲酯反应合成了硼酸酯键合剂原料N，N-二羟乙基乙酰乙酰胺。

It was shown that all of the four β-diketones tested, acetylacetone, trifluoroacetylacetone, benzoylacetone and 1-phenyl-3-methyl-4-benzoylpyrazolone-5, improved the sensitivity of Al to some extent.

结果表明，四种螯合物对Al的分析性能均有一定程度的改善。

Formyl-3-acetyl-4-methyl-5-carbobenzoxypyrrole (6) was synthesized via the selective oxidation of 2,4-dimethyl-3-acetyl-5-carbobenzoxypyrrole (5), which was produced from acetylacetic benzylester (1) via nitrosation, reduction and addition-cyclization with acetylacetone. The total yield of the product was about 34%.

以乙酰乙酸苄酯(1)为原料，经过亚硝化、还原、与乙酰丙酮加成环化生成2， 4-二甲基－3-乙酰基－5-苄氧羰基吡咯(5)，通过选择性氧化反应制得目标化合物2-甲酰基－3-乙酰基－4-甲基－5-苄氧羰基吡咯(6)，反应的总收率约为34%。

Various synthetic method of 1,3-propanediol were introduced and compared, including hydration and hydrogenation of acrylaldehyde, carbonylation of epoxy ethane , microbiological fementation, the process starting from methyl aldehyde, etc.

介绍了1，3-丙二醇的几种制备方法，即丙烯醛水合-氢化法、环氧乙烷羰基化法、微生物发酵法和以甲醛等为原料的方法。

Its hydrophilic groups is the inside carbonyl and amine base, and its lipophilic groups is the inside hydrocarbon chain and outer methyl. PAMAM of integral generation basically has not the surface activity. Its reason is that its outer groups is acylamino groups having very strong hydrophilicity so as not to reduce the surface tension of water. PAMAM different from traditional surfactant, have not critical micelle concentration, and exist in the form of "unimolecule micelle" in water.

结果表明：半代的PAMAM水溶液的表面活性与其分子具有两亲结构有关，亲水基团是内部的羰基和胺基，亲油基团是内部的碳氢链和外层的甲基；整代的PAMAM水溶液基本上没有表面活性，其原因是其最外层基团是酰胺基，亲水性很强，不能降低水的表面张力；树状大分子与传统的表面活性剂不同，不存在临界胶束浓度，在水中是以&单分子胶束&形式存在。

Aegle marmelos ; Anti-lipid peroxidation ; 4-Methoxy-1-methyl-2-quinolone; Superoxide dismutase; Catalase ; GSH-peroxi

木桔；抗脂质过氧化作用； 4－甲氧基－1－甲基－2－喹诺酮；超氧化物岐化酶；过氧化氢酶；谷胱甘肽过氧化物酶

composite latex ; methyl acrylic acid ; particle size ; carboxylic group distribution ; alkalic thickening

本文研究了复合乳化剂浓度、聚合方法对 St/BA/MAA复合胶乳的粒子大小、羧基分布及碱增稠性的影响。1 实验部分1

Third, Polymerization behaviors of alkenyl substituted Cp Lanthanide complexes as Methyl Methacrylate polymerization catalysts were also studied.

最后，本文还分别考察了烯丁基和烯丙基取代茂的稀土络合物对甲基丙烯酸甲酯的催化聚合反应。

The alkaloids were studied by gas chromatography coupled to mass spectrometry. Six major venom alkaloids were detected in worker venom which are all trans 2-methyl-6-alkyl or alkenyl pepdine according to mass spectral data and relative report on S.invicta.

通过保留时间和质谱离子碎片数据，并与国外相关报道比较分析得出：入红火蚁毒液中主要成分为2-甲基-6-烷基或烯基哌啶生物碱，仅有6位取代烃基碳链长短和烯键有无及顺反异构的差异。

This immediately brings us to the next part of this article: creating an output "replace function".

下面进入文章的第二部分：建立一个"缓存处理函数"。

He was elected as an International Ornithological Committee member in 2002 during the 24th IOC held in Beijing.

现为中国鸟类学会理事和WPA 专家组成员。2002年被推选为国际鸟类委员会委员。