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It,s allelchemicals were isolated through extraction, thin-layer chromatography, and column chromatograpathy. After the white clover was infused in ethanol and evaporation, the leavings was dissolved by water. The aqueous extract was extracted by petroleum,chloroform, ethyl acetate and n-Butanol successively, and the bioassay showed that the chloroform phase has obvious inhibitory effect, the inhibitory rate was 44.32%,88.08% on Abutilon theophrasti M., seedling length and root length, 82.08%,92.16% on Echinochloa crusgalli L., seedling length and root length, and the Amaranthus retroflexux L., germination rate is 0, the secondly was ethyl acetate phase.

运用萃取、薄层层析、柱层析等方法对白三叶草地上部分的化感物质进行初步分离，结果表明，白三叶草经乙醇浸提旋转蒸发后用蒸馏水溶解，依次用石油醚、氯仿、乙酸乙酯、正丁醇萃取，生物测定表明氯仿组分对杂草的抑制作用最强，对苘麻芽长和根长抑制率分别为44.32%、88.08%，对稗草芽长和根长的抑制率分别为82.08%、92.16%，反枝苋的发芽率为0；其次是乙酸乙酯相。

Tebufenpyrad, a new high effective pyrazoleamide acaricide , was synthesized from 1-methyl-3-ethyl-4-chloro-5-pyrazolecarbon acid and 4-t-butylbenzylamine, the raw material are propionyl pyruvic ethyl ester and 4-t-butyl benzylchloride.

吡螨胺是一种新型、高效的吡唑酰胺类杀螨剂，本文以中间体1-甲基-3-乙基-4-氯-5-吡唑甲酸和4-叔丁基苄胺合成，起始原料丙酰丙酮酸乙酯和4-叔丁基苄氯，总收率为61.23%。

In this paper, through a series of experiments, two series of quaternary-ammounium Gemini surfactants were synthesized, namely the pair alkylene double quaternary ammonium salt surfactant m-s-m·2Br and the pair the alkylene double quaternary ammonium salt surfactant -s-·2Br. We has carried on the attribute with the infrared spectrum to its structure, and to affected the factor which the synthesis pair the alkylene double quaternary ammonium salt surfactant responded to carry on the discussion. We has discovered the synthesis pair the ethylene double quaternary ammonium salt surfactant m-2-m·2Br optimum condition: The bromo alkane and a tetramethyl ethylene diamine mole of ratio is 3.0: 1.0, makes the solvent by the ethyl alcohol, 80℃ under responds for 48 hours in the backflow temperature; Synthesis pair alkylene double quaternary ammonium salt surfactant 12-S-12 ·2Br optimum condition: 12 tertiary amine and 1, 3- propylene dibromide (1, 4- two bromines butane) a mole of ratio is 2.2: 1.0, makes the solvent by the ethyl alcohol, responds for 48 hours in the constant temperature 80 ℃ under backflow.

本文通过一系列的实验，合成了两个系列的Gemini型表面活性剂，即双烷撑双季铵盐表面活性剂m-s-m·2Br和双烷撑双季铵盐表面活性剂-s-·2Br，用红外光谱对其结构进行了表征，并且对影响合成双烷撑双季铵盐表面活性剂反应的因素进行了讨论，找出了合成双乙撑双季铵盐表面活性剂m-2-m·2Br的最佳条件：溴代烷与四甲基乙二胺的摩尔比为3.0：1.0，以乙醇作溶剂，在回流温度80℃下反应48小时；合成双烷撑双季铵盐表面活性剂12-s-12·2Br的最佳条件：十二叔胺与1，3-二溴丙烷(1，4-二溴丁烷)摩尔比为2.2：1.0，以乙醇作溶剂，在恒温80℃下回流反应48小时。

ResultsThe IC50 of the ethyl acetate extract from Alocasia macrorrhiza to A549, B16, BGC-823 were 94.6, 541.9,629.5 μg·ml-1 respectively,and those of the acetone extract from Alocasia macrorrhiza to A549 and B16 40.9,438.0 μg·ml-1 respectively. But there were quite large dosages of the IC50 of the extracts of cyclohexane, benzine, ethyl alcohol and water from Alocasia macrorrhiza to all kinds of cell lines.

结果海芋醋酸乙酯提取物对A549，B16，BGC-823的IC50分别为94.6， 541.9，629.5 μg·ml-1，丙酮提取物对A549，B16的IC50分别为40.9，438.0 μg·ml-1，而海芋的环己烷，石油醚，乙醇，水提物对各种细胞株的IC50剂量都比较大。

Results: Using of handy infrared gas spectrometer, the ammonia, sulphur dioxide, acetone, butanone, ethyl acetate, chloroform, benzene, toluene, methyl alcohol, ethyl alcohol, isopropanol, and other harmful gases can be carried out quickly Online Testing. The arsine, hydrogen chloride, hydrogen cyanide, hydrogen sulfide can not be detected online.

结果：可利用便携式红外气体分析仪对氨、二氧化硫、丙酮、丁酮、乙酸乙酯、氯仿、苯、甲苯、甲醇、乙醇、异丙醇等有害气体可进行快速的在线检测，不能对砷化氢、氯化氢、氰化氢、硫化氢进行快速在线检测。

Ophenyl phenol,ophenyl phenol sodium salt tetrahydrate,7ADCA,2ethyl phenyl hydrazine hydrochloride,2,3dihydrofuran,7ethyl3(2hydroxy ethyl)indole,methyl ester of etodolac; 1,8diethyl1,3,4,9tetrahydropyrano[3.4b] indole1acetic acid methyl ester,5chloro2methoxy benzoic acid,4(2aminoethyl)benzene sulfonamide,5cyano phthalide,phthalhydrazide,9thioxanthenone,n[(1,4benzodioxane2yl)carboxyl]piperazine HCL,2chloro4amino6,7dimethoxyquinazoline,2chloro benzimidazole,1(4fluorobenzyl)2chlorobenzimidazole,2methylthio4pyrimidone,5amino4imidazole carboxamide HCL,6chloro2hexanone,11oxo6.11hydrodibenzothiepin,6,11dihydrodibenzooxepin11one,10,11dihydrodibenzocyclohepten5one;dibenzosuberone,dibenzo cyclohepten5one;dibenzosuberenone,3,5dihydroxy benzoic acid,3,5dihydroxy benzyl alcohol,2mercapto benzimidazole,3,4dihydroxy benzaldehyde,3,4dihydroxy benzonitrile,2amino5chloro benzonitrile,2(4chlorophenoxy)ethyl chloride,2(4chloro phenoxy)tert,butane,ditrimethylol propane;DTMP,2,2bis(4hydroxyphenyl)butane; bisphenol B,1,1'bis(4hydroxyphenyl)cyclohexane;bisphenol Z,tetrabromobisphenolS,3,5ditertbutyl salicylic acid,3,4,5trihydroxy benzoic acid stearyl ester,1,2,4trimethoxybenzene.

华业公司产品：邻苯基苯酚，邻苯基苯酚钠盐，7氨基3去乙酰氧基头孢烷酸，邻乙基苯肼盐酸盐，2，3二氢呋喃，7乙基色氨醇，依托度酸甲酯，5氯2甲氧基苯甲酸，4(2氨乙基)苯磺酰胺，5氰基苯酞，双酮酞嗪，9噻吨酮，N〔(1，4苯并二恶烷2基)羰基〕哌嗪盐酸盐，2氯4氨基6，7一二甲氧基喹唑啉，2氯苯并咪唑，1(4氟苄基)2氯苯并咪唑，2甲硫基4嘧啶酮，5氨基咪唑4 甲酰胺盐酸盐，6氯2已酮，11氧6.11二氢苯并〔b.c〕虑平，11氧代6，11二氢二苯并氧杂卓，10，11二氢二苯并环庚烯5酮，二苯并环庚烯5酮，3，5二羟基苯甲酸，3，5二羟基苯甲醇，2巯基苯并咪唑，3，4二羟基苯甲醛，3，4二羟基苯腈，2氨基5氯苯腈，2(4氯苯氧基)1氯乙烷，2(4氯苯氧基)叔丁烷，双丙烷，2，2二(4羟基苯基)丁烷；双酚B，1，1'双(4羟基苯基)环己烷；双酚Z，2[3，5二溴4(2，3二溴丙氧基)]苯砜，3，5二叔丁基水杨酸，3，4，5三羟基苯甲酸十八烷基脂，1，2，4三甲基氧基苯。

Suitable water-immiscible organic solvents include aromatic hydrocarbons, eg toluene, xylene, naphthalene, tetrahydronaphthalene and methyl naphthalene; chlorinated aromatic hydrocarbons, eg chlorobenzene, fluorobenzene, chloronaphthalene and bromonaphthalene; esters, eg butyl acetate, ethyl acetate, methyl benzoate, ethyl benzoate, benzyl benzoate, butyl benzoate, phenylethyl acetate, butyl lactate, benzyl lactate, diethyleneglycol dipropionate, dimethyl phthalate, diethyl phthalate, dibutyl phthalate, di(2-ethylhexyl) phthalate; alcohols having six or more carbon atoms, eg hexanol, octanol, benzyl alcohol, phenyl ethanol, phenoxy ethanol, phenoxy propanol and phenoxy butanol; ethers having at least 5 carbon atoms, preferably C 5-14 ethers, eg anisole and phenetol; nitrocellulose, cellulose ether, cellulose acetate; low odour petroleum distillates; turpentine; white spirits; naphtha; isopropylbiphenyl; terpene; vegetable oil; mineral oil; essential oil; and natural oil; and mixtures of any two or more thereof.

适用于水互溶的有机溶剂包括芳香族碳氢化合物，如甲苯，二甲苯，萘，四氢萘和甲基萘；氯代芳香族碳氢化合物，如氯苯，氟，氯萘和萘；酯类，如醋酸丁酯，醋酸乙酯，苯甲酸甲酯，苯甲酸乙酯，苄酯，苯甲酸正丁酯，苯，醋酸丁酯乳酸，乳酸苄，二甘醇二丙酸酯，邻苯二甲酸二甲酯，邻苯二甲酸二乙酯，邻苯二甲酸二丁酯，二（2乙基己基）酯；醇有6个或更多碳原子，如己醇，辛醇，苯甲醇，苯乙醇，苯氧基乙醇，丙醇和苯氧基苯氧丁醇；醚至少有5个碳原子，最好荤5-14醚，如苯甲醚和phenetol；硝化棉，纤维素醚，醋酸纤维素，低气味石油蒸馏；松节油；白酒，石脑油isopropylbiphenyl；萜类，植物油，矿物油，挥发油；和天然油，以及任何两个或两个以上其混合物。

My company can provide pesticide, medicine, veterinary medicine intermediates, have 48 kinds of products (p-Bromo-p-Bromotoluene bromoform 1 - bromo-heptane Triethyl Citrate 1,2,3 - three Bromopropane 3 - Chlorine -4 - fluoro bromobenzene Bromotoluene ethylbenzene 4 - bromo -2 - bromo-ethyl-Chloroaniline 2 - bromo--5 - chloro-toluene 3 - bromo-C methyl 1,6 - dibromo-hexane 1 - bromo --4 - p-methoxy benzaldehyde o-bromo-acetic acid propyl bromide p-fluorotoluene dodecane four bromoethane of iodine bromide toluene tert-butane Tributyl Citrate 2 - bromo-p inter - Hydroxybenzaldehyde bromine butane 2 - bromo-propionic acid bromide veratryl aldehyde inter-bromo-trifluoro-n-hexane of toluene on Bromoxynil Bromotoluene toluene ethylbenzene o-bromophenol bromide Cyclohexane Cyclopentane bran bromate bromide Malay Dibutyl Ethyl Lactate Propylene between bromine bromine bromine between aniline o-anisidine o-fluorophenol difluorobenzonitrile to aminobenzaldehyde Bromotoluene aniline on Bromobenzaldehyde Bromotoluene acid) expressed the hope that customers contact us!

我公司可提供农药，医药，兽药中间体，有四十八种产品(对溴苯酚对溴甲苯溴仿 1-溴庚烷柠檬酸三乙酯 1，2，3-三溴丙烷 3-氯-4-氟溴苯对溴乙苯 4-溴-2-氯苯胺溴乙酸乙酯 2-溴-5-氯甲苯 3-溴丙酸甲酯 1，6-二溴己烷 1-溴-4-硝基苯邻甲氧基苯甲醛溴乙酸丙酯对氟甲苯溴代十二烷对碘甲苯四溴乙烷溴代叔丁烷柠檬酸三丁酯 2-溴氯苯间羟基苯甲醛溴丁烷 2-溴丙酸黎芦醛溴已烷间溴三氟甲苯对溴苯腈对溴乙苯邻溴甲苯溴代环已烷溴代环戊烷糠溴酸马来酸二丁酯溴丙烯乳酸乙酯间溴苯胺间溴苯甲醚邻氟苯酚邻氟苯腈对氨基苯甲醛对溴苯胺对溴苯甲醛对溴苯甲酸)希望广大客户与我司联系！

The main products are: HH-01 fungicides HH-02 organic dispersant HH-03 cationic starch Wood HH-04 cationic starch Department HH-05 modified starch warp sizing agents also sell German Baker Chemical Co., Ltd. Main Products Defoamer series product: E640, T50 Surface Sizing Agent: A281, A288, K532, pesticides / medicine / veterinary medicine a variety of intermediate products (p-Bromo-p-Bromotoluene bromoform 1 - bromo-heptane triethyl citrate 1,2, 3 - Three Bromopropane 3 - chloro -4 - fluoro bromobenzene Bromotoluene ethylbenzene 4 - bromo -2 - bromo-ethyl-Chloroaniline 2 - bromo--5 - chloro-toluene 3 - bromo-methyl 1,6 C - Dibromo Hexane 1 - bromo -4 - nitrobenzene o-methoxy benzaldehyde acid propyl bromide p-fluorotoluene bromo dodecane toluene four of iodine bromide bromoethane three citric acid tert-butane n-butyl 2 - bromo-p-bromo-butane Hydroxybenzaldehyde between 2 - bromo-propionic acid bromide veratryl aldehyde inter-bromo-trifluoro-n-hexane of toluene on Bromoxynil Bromotoluene toluene ethylbenzene o-bromophenol bromide bromide Cyclohexane Cyclopentane bran acid dibutyl maleate Ethyl Lactate Propylene between bromine bromine bromine between aniline o-anisidine o-fluorophenol difluorobenzonitrile to aminobenzaldehyde Bromotoluene aniline on Bromobenzaldehyde Bromotoluene acid) and other relevant units have been in substantial promotion, and client set up a good relationship of cooperation has been the user's praise.

现主要产品：HH—01杀菌剂 HH—02有机分散剂HH—03阳离子淀粉 HH—04木署阳离子淀粉 HH—05 经纱上浆变性淀粉同时还代理销售德国贝克化学公司系列产品主要产品消泡剂：E640 、T50 表面施胶剂：A281、A288 、K532，农药/医药/兽药中间体多种产品(对溴苯酚对溴甲苯溴仿 1-溴庚烷柠檬酸三乙酯 1，2，3-三溴丙烷 3-氯-4-氟溴苯对溴乙苯 4-溴-2-氯苯胺溴乙酸乙酯 2-溴-5-氯甲苯 3-溴丙酸甲酯 1，6-二溴己烷 1-溴-4-硝基苯邻甲氧基苯甲醛溴乙酸丙酯对氟甲苯溴代十二烷对碘甲苯四溴乙烷溴代叔丁烷柠檬酸三丁酯 2-溴氯苯间羟基苯甲醛溴丁烷 2-溴丙酸黎芦醛溴已烷间溴三氟甲苯对溴苯腈对溴乙苯邻溴甲苯溴代环已烷溴代环戊烷糠溴酸马来酸二丁酯溴丙烯乳酸乙酯间溴苯胺间溴苯甲醚邻氟苯酚邻氟苯腈对氨基苯甲醛对溴苯胺对溴苯甲醛对溴苯甲酸)等在相关单位得到了大量推广，与客户建立了良好的合作关系，得到了用户的赞誉。

Content of butanoic acid, methyl ester; butanoic acid, ethyl ester; hexanoic acid, methyl ester; DMHF; DMMF identified in strawberry cultivated from green house were higher than that cultivated in the open field of the correspongding nitrogen levels , and the hexanoic acid, ethyl ester could only identified in green house strawberries.

不同氮素水平温室草莓果实中丁酸甲酯、丁酸乙酯、己酸甲酯、DMHF、DMMF的相对含量和总量均比相应氮素水平的露地草莓的高，且己酸乙酯只是在温室草莓中检测到。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。