查询词典 phenols

Phenols are polar narcosis compounds, whose toxicity to photobacterium phosphoreum can be described by logP and pKa.

苯酚类化合物在水中的电离程度受水环境pH的影响，因此pH值成为影响其毒性的重要因素之一。

Using an improved genetic algorithm combined with a BP algorithm a new method IGA-BP,QSAR model was developed that links molecular structures of a set of 50 alkylated and/or halogenated phenols with their polar narcosis toxicity.

采用改进的遗传算法和BP人工神经网络相结合的方法，研究了50个酚类化合物的麻醉毒性和分子结构之间的相关性，并与单纯用BP人工神经网络建立的模型进行比较。

It is shown that main reason causing browning and senescence of Nelumbo nucifera gaertn in the storage is that catalytic oxidation of polyphenol oxidasein its tissue make phenols into black pigment.

指出莲藕在贮藏过程中发生褐变和衰老的主要原因是组织内部的多酚氧化酶催化氧化酚类物质产生黑色素。

The different effects of nitro and chlorine substituent groups on the phenols degradation were also discussed in this paper.

酚类化合物苯环上的硝基和氯取代基也是影响氧化速度的主要因素。

Nitro derivatives of phenols, the pyrolysis initial reaction is an isomerization reaction It meansthe O-H bond in hydroxide rupture, then the Hydrogen atom transfer to the Oxygen atom in nitryl to form isomer.

苯酚的硝基衍生物的热解引发反应为异构化反应——酚羟基中的氢氧键断裂，氢原子迁移到邻位硝基(-NO_2)中的氧原子上，形成新的异构体化合物。

The bio-degradation pathways of NP would be that the long branches in nonyl of NP are firstly degraded into short methyl branches, which come into being a series of short chain alkyl phenols with different branch structures. The middle products should be further metabolized into simpler compounds, such as benzene acetic.

污水生物处理过程中壬基酚可能的初级生物代谢途径是壬基上的长支链断裂为短的甲基链，生成一系列带有不同分支结构的短链烷基酚类代谢产物，进一步的代谢产物有苯乙酸。

There are different methyl branch structures correlated with isomerous nonyl of NP in the alkyls. The primary metabolites from the dominant bacteria experiment have alkyl phenols and benzene acetic.

研究结果表明，活性污泥降解壬基酚的初级代谢产物主要为C4～C6烷基取代苯酚，烷基链的结构差异与其母体壬基的异构方式有关，烷基上的支链主要为甲基；优势降解菌群代谢壬基酚的初级产物除烷基苯酚外，还有苯乙酸等。

The photooxidation of four substituted phenols by manganese ore particles were studied.

研究了不同条件下锰矿砂对4种取代酚的光氧化作用。

The reactions of several phenols and 2, 2, 6, 6-tetramethyl-4-substituted piperidine oxoammonium salt have been studied. It was found that these oxoammonium salts are new facile reagents for phenolic coupling.

应用2，2，6，6-四甲基哌啶氧铵盐实现了酚类的氧化偶联反应：对位取代的酚类底物得到邻位-邻位偶联产物；2，6-二取代的酚类底物得到对位-对位偶联产物；2，4，6-三取代的阻碍酚类底物得到苄位氧化偶联产物。

The method adopts powders (10.0 parts of mass) of crop straws and phenols or polyalcohol compound (10 to 100 parts of mass) which is firstly pre-heated by 10 to 30 minutes under a temperature of 30 to 200 DEG C with the effect of acid catalyst (0.5 to 10 parts of mass) for a reaction of 30 to 240 minutes; after the reaction, the compound is washed, neutralized, filtered and dried to obtain a solid appearing as a color from citron yellow, yellow, bight brown to seal brown; wherein, the solid includes 64.0 to 70,0 percent of fibrin and 4.1 to 7.6 percent of lignin.

秸秆"液化"预处理制备生产燃料乙醇原料的方法，是用农作物秸秆的粉末(10.0质量份)和酚类或多元醇类化合物(10～100质量份)，在酸性催化剂(0.5～10质量份)存在下，在30～200℃温度下预热10～30min后，反应30～240min，反应完毕进行洗涤、中和、过滤和干燥而得呈淡黄色-黄色-浅褐色至深褐色固体，其中，纤维素含量64.0～70.0％，木质素含量4.1～7.6％。

Do you know, i need you to come back

你知道吗，我需要你回来

Yang yinshu、Wang xiangsheng、Li decang,The first discovery of haemaphysalis conicinna.

1〕 杨银书，王祥生，李德昌。安徽省首次发现嗜群血蜱。