乙胺

The amount of Na+, NH4+, K+, Mg2+, Ca2+, Zn2+ in fruits and juice (sports water, green tea , pear juice, carrot juice and carrot and orange juice) were respectively separated and detected by non-suppressed ion chromatography.

采用非抑制型离子色谱法测定了水果以及饮料(运动型饮料、绿茶、水蜜桃汁、胡萝卜汁和胡萝卜橙汁)中Na+、NH4+、K+、Mg2+、Ca2+、Zn2+的含量，其中一价阳离子以吡啶-2，6-二羧酸为淋洗液测定，二价阳离子以吡啶-2，6-二羧酸+乙二胺+草酸为淋洗液测定。

Comb-shaped copolymer of polycarboxylate containing carboxyl,sulfonic groups(-SO3M),polyethylene glycol(-OC2H4-) was synthesized by monomers of sodium 2-acrylamido-2-methylpropane sulphonate,acrylic acid,polyethylene glycol monoester acrylate under certain conditions.

本文通过2-丙烯酰胺-2甲基丙基磺酸钠与丙烯酸、聚乙二醇单丙烯酸酯在一定条件下发生聚合反应合成含有羧基、磺酸基(—SO3M)、聚氧乙烯链(—OC2H4—)等侧链的高性能减水剂PC。

To dye the different types of fibers by the same dye, universal dyes based on naphthalene ring system are prepared by the diazo coupling reaction of 7-acetamide-4-hydroxy-2-oaphtialene-β-(N,N-dimethylaminoethyl)solfonamide and m-aminobenzene-β-hydroxyethyl sulfone sulfunate.

为了实现用同一支染料对不同类型的纤维进行染色的目的，通过间氨基苯基－β-羟乙基砜硫酸酯与7-乙酰氨基－4-羟基－2-萘－β磺酰胺的重氮化偶合反应合成了含萘环的通用染料，其结构通过质谱分析进行了表征。

Methods According to the drinking water legislation in Europe threshold: 0.10mg/L NO2(superscript -, a rapid spot test method for nitrite in water was established by using an optimized composition of reagent mixture and a binary positive/negative response, conducted as follows: a tablet of a mixture of solid reagents containing sulfanilamide, N-(1-naphthyl) ethylene diamine dihydrochloride and sodium chloride was put on a spot test plate of Teflon mould, then, a drop of 30% HCl and a drop of water sample were added on the reagent material.

根据欧洲饮水法规亚硝酸盐限值(0.10mg/L)，使用一种优化的试剂混合物和二元的阳性－阴性反应，建立一种水中亚硝酸盐快速点滴检验法。结果将1片含磺胺、N-（1-萘）乙二胺二盐酸盐和氯化钠的固体试剂混合物放在聚四氟乙烯模的点滴检验板上。加1滴30%盐酸和1滴水样于试剂片上。

Chloroacetic acid,chloromethyl ether,acetone,mphenylenediamine,butyl acetate,ethyl acetate,methylene chloride,ethylene dichloride,dioxane.

氯乙酸，氯甲醚，丙酮，间苯二胺，醋酸丁酯，醋酸乙酯，二氯甲烷，二氯乙烷，二氧六环。

The effect of buffer pH and applied voltage on the migration behavior, the UV signal and the separation of aesculin and aesculetin were systematically studied using capillary zone electrophoresis.

实验表明当pH在5.47-8.50范围内，不仅秦皮甲素和秦皮乙素彼此间得到分离，而且也能与中性标记物甲酰胺分离。

In the pharmaceutical aisles, I found 61 varieties of untan oil and sunblock , and 80 different pain relievers —aspirin, acetaminophen, ibuprofen; 350 milligrams or 500 milligrams; caplets, capsules, and tablets; coated or uncoated.

在药品的过道上，我发现有61种不同的untan 油和防晒霜，还有80种止痛药——阿司匹林，乙醯胺基酚，异丁苯丙酸，还分350毫克和500毫克；还有囊片，胶囊，药片，其中还分有有包裹层和没有包裹层的。

A base-catalyzed novel olefination methodology based on elimination of p-toluenesulfonamide:Treatment of diethyl cyanomethylphosphonate with catalytic amount of basegave the corresponding phosphoryl-stabilized carbanion, which added to the carbon-nitrogen double bond of N-tosyl imines.

新形成的氮负离子进一步攫取另一分子膦酸酯的活泼亚甲基氢形成加成产物同时再生出膦酰基稳定的碳负离子。加成产物消除对甲苯磺酰胺，高度立体选择性地得到-α-氰基-β-芳基-乙烯基膦酸二乙酯。

Then we completed the first total synthesis of-Plakoridine A using Eschenmoser couping reaction as akey step. During the synthesis we found the choice of protecting groups and the configuration of the chiralcenter of the substrate play an important role to the key Eschenmoser reaction,so we think our successwould be of guide for synthesizing other polysubstituted pyrrolidines or piperidines.

在论文的第一章中，我们先以易得的对羟基苯乙酸乙酯为原料经多步反应制得了所需的β氨基酸酯，然后利用立体选择性的Aldol缩合反应和内酰胺化反应制得了Plakoridine Alactam，随后，以Eshenmoser缩合反应为关键步骤完成了生物碱-Plakoridine A的首次不对称全合成。

Also, the "MeiTai" pumpkin showed a little bit higher tolerance to pendimethalin than "NO1 pumpkin" cultivar.3 The differences in Inhibition rate on different cucurbits between two herbicidesResults showed that inhibition increased with rate of application of herbicides increase. There was little injury of pendimethalin at 5 ppm on "white beauty "muskmelon,"green farmNo9" watermelon,"Jinghu No2"squash and "MeiTai" pumpkin.

不同除草剂对不同瓜类抑制率的差异在除草剂用量5ppm～10ppm之间，随着浓度的增加，抑制有明显增强的趋势。5ppm施田补对&白美人&甜瓜、&绿农九号&西瓜、&京葫二号&西葫芦及&美泰赤粟&南瓜安全。10ppm对&绿农九号&也很安全，对&京葫二号&相对安全，对其它瓜类安全性不高。5ppm及10ppm的乙草胺对&绿农九号&西瓜安全，对&南瓜一号&相对安全。

I am accused of being overreligious," she said in her quiet, frank manner,"but that does not prevent me thinking the children very cruel who obstinately commit such suicide.""

客人们在卡罗利娜·埃凯家里，举止就文雅一些，因为卡罗利娜的母亲治家很严厉。

Designed by French fashion house Herm è s, this elegant uniform was manufactured in our home, Hong Kong, and was the first without a hat.

由著名品牌 Herm è s 设计，这件高贵的制服是香港本土制造，是我们第一套不配帽子的制服。