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The different catalytic systems are discussed. The results show that sodium tungstate has effective catalytic ability.
实验结果表明,钨酸钠和双季铵盐催化体系能在温和的条件下,催化稀过氧化氢溶液氧化环己醇、苯甲醇、环己烯。
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R-1,c-2, t-3, t-4-1,3-bis(4-biphenyl)-2,4-di(4-pyridyl)cyclobutane was obtained in diluted sulfuric acid by photodimerization reaction.
通过反-1-(4-联苯基)-2-(4-吡啶基)乙烯在稀硫酸中的光二聚反应合成了r-1,c-2,t-3,t-4-1,3-双(4-联苯基)-2,4-二(4-吡啶基)环丁烷。
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If we adopt normal methods to exploit,we can not have any economic benefit,but if we adopt double step horizontal wells,it can increase drainable area greatly,enhance individual well producing rate, achieve the Tarim Oil field's exploiting rule of\"wide spacing,high production\".
若采用常规方式开采,毫无经济效益,而利用双台水平井可大大增加泄油面积,可提高单井产量,实现&稀井高产&的开发效果。
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Comparative studies of double balloon enteroscopy and barium enteroclysis in etiological diagnosis of small bowel diseases
目的比较双气囊小肠镜与小肠稀钡灌注和胶囊内镜检查在小肠肿瘤诊断中的诊断率和准确率。
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The diluent solution of glyoxylic acid and oxalic acid was used as the separation object.TOA (in n-octanol) was used as the solvent. The extraction characteristics of single acid and two-acid solution were studied,and the influence of pH and the concentration of complexing agent on the distribution coefficients were measured. The suitable mathematic models were proposed to describe the relationship between TOA and carboxylic acid based on assumed extraction reaction in organic phase.
摘 要:以草酸和乙醛酸的稀溶液为分离对象,采用三辛胺为萃取反应剂、正辛醇为稀释剂,研究了单溶质、双溶质有机酸的萃取分离特性,测定了溶液pH值、萃取反应剂的浓度等因素对双溶质有机酸萃取的影响,提出了萃取的化学反应发生在有机相中的假定,建立了TOA萃取草酸的数学模型。
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The diluent solution of glyoxylic acid and oxalic acid was used as the separation object. TOA (in n-octanol) was used as the solvent. The extraction characteristics of single acid and two-acid solution were studied, and the influence of pH arid the concentration of complexing agent on the distribution coefficients were measured. The suitable mathematic models were proposed to describe the relationship between TOA and carboxylic acid based on assumed extraction reaction in organic phase.
以草酸和乙醛酸的稀溶液为分离对象,采用三辛胺为萃取反应剂、正辛醇为稀释剂,研究了单溶质、双溶质有机酸的萃取分离特性,测定了溶液pH值、萃取反应剂的浓度等因素对双溶质有机酸萃取的影响,提出了萃取的化学反应发生在有机相中的假定,建立了TOA萃取草酸的数学模型。
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Detection results showed samples VA2, VA7 and VA8 from Malvastrum coromandelianum had weak reaction with MAb SCR18, and samples X2 from Siegesbeckia orientalis had weak reaction with MAb SCR18 and SCR106, while other samples had no reaction with MAbs.
用双生病毒兼并引物PA、PB对杂草样本进行特异性的PCR检测,结果发现仅有赛葵样本VA2、VA7、VA8和稀硷样本X2出现约500bp条带,说明这些杂草上存在双生病毒。
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Accordingly, the 16-carbon acid with one double bond is hexadecenoic acid and has the trivial name palmitoleic acid.
据此,有一个双键的16C酸即为hexadecanenoic acid十六稀酸,俗名称为棕榈油酸。
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Accordingly, the16-carbon acid with one double bond is hexadecenoic acid and has thetrivial name palmitoleic acid.
据此,有一个双键的16C酸即为hexadecanenoicacid十六稀酸,俗名称为棕榈油酸。
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Although the experimental temperature, concentration and vel...
研究表明,对于底部冷却的静态定向结晶过程,两相区低温稀溶液层的存在是形成双扩散对流的原因;双扩散对流的形成与发展造成液相区速度、温度和浓度呈盐指型分布,并促使两相区形成孔道流。
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biuret reaction:双缩脲反应
⒉双缩脲反应(biuret reaction) 蛋白质和多肽分子中肽键在稀碱溶液中与硫酸铜共热,呈现紫色或红色,称为双缩脲反应. 氨基酸不出现此反应. (一)碱基的种类:构成核苷酸的五种碱基(base)分别属于嘌呤(purine)和嘧啶(pyrimidine)两类含氮杂环化合物(见图2-1).
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Droseraceae:茅膏菜科
茅膏菜科(Droseraceae)双子叶植物纲五桠果亚纲的1科. 食虫草本,稀亚灌木,多生于强酸性的湿地,惟貉藻浮生水中. 叶互生(貉藻叶轮生),常无地上茎而基出成莲座状叶丛,叶在芽时常拳卷,外面通常有腺毛借以捕捉昆虫. 花两性,辐射对称,有限花序,
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Hippuridaceae:杉叶藻科
杉叶藻科 (Hippuridaceae)双子叶植物纲菊亚纲的1科. 多年生水生草本,具匍匐根状茎. 茎直立不分枝,其下部多浸在水中,上部则出露于水面之上. 叶线形,4~12枚轮生,沉水叶往往比气生叶长而软. 花小,单生于茎上部的叶腋,两性,稀具单性雌花,