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disulfides
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  二硫化物
     Synthesis of new compounds seven bis(2 aryl 1,3,4 triazol 5 yl)disulfides(2a~2g) and five 1 ethyl 2 aryl 1,3,4 triazol 5 ethylthioethers has been reported.
     报道了7种双(2-芳基-1,3,4-三唑-5-基)二硫化物(2a~2g)和5种1-乙基-2-芳基-1,3,4-三唑-5-乙硫醚的合成,。
短句来源
     The distribution of sulfur compounds is very similar in both FCC naphthas, with 50%~60% thiophenes, 5%~6% disulfides, 25%~30% sulfides and 10%~13% thiols.
     两种FCC汽油具有相似的硫化物含量分布 ,其中噻吩硫占 5 0 %~ 60 % ,二硫化物占 5 %~ 6% ,硫醚占 2 5 %~ 3 0 % ,硫醇占 10 %~ 13 %。
短句来源
     Synthesis and bioactivity of bis[(N-arylureido)phenyl] disulfides
     双[(N-芳基脲基)苯基]二硫化物的合成与生物活性
短句来源
     Eleven new bis[(N-arylureido)phenyl] disulfides were synthesized by reacting bis(4-amino-2-chlorophenyl)disulfides with aromatic isocyanates. Their structures were confirmed by MS, 1H NMR, and IR spectra.
     由双(4-氨基-2-氯苯基)二硫醚与芳基异氰酸酯反应,合成了11个不同取代的双[(N-芳基脲基)苯基]二硫化物,结构经IR、MS和1HNMR确定。
短句来源
     Organic disulfides, obtained by oxidation of-SH-containing organic reagents, have been used for the selective liquid-liquid extraction of many elements.
     含-SH有机试剂的氧化产物二硫化物已被用于许多元素的有选择性的液液萃取。
短句来源
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  二硫化物类
     The Structure-activity Relationship of Antifungal Triazoles and Disulfides and "Azole-ethyl-heteroatom"Hypothesis
     三氮唑类和二硫化物类化合物的抗真菌构效关系研究及“氮唑-乙基-杂原子”假说
短句来源
  “disulfides”译为未确定词的双语例句
     Conjugation Addition of Disulfides to α,β-Unsaturated Compounds Promoted by Zn/AlCl_3
     Zn/AlCl_3促进下二硫醚与α,β-不饱和化合物的共轭加成
短句来源
     SYNTHESIS OF N-(2-MERCAPTOPYRIDYL-3-FORMYL)-N-ALKYL GLYCINE AND THE CORRESPONDING DISULFIDES
     N-(2-巯基吡啶-3-甲酰)-N-烃基甘氨酸及其双硫化合物的合成
短句来源
     STUDIES ON RADIOPROTECTIVE ACTIVITIES OF CYCLIC DISULFIDES Ⅴ. SYNTHESIS OF 4-SUBSTITUTED 1,2-DITHIOLANE DERIVATIVES
     环状双硫化物的辐射防护研究Ⅴ.4-取代1,2-二硫环戊烷衍生物的合成
短句来源
     The bond in thiocarbonic esters were reduced by SmI_2-HMPA-THF-t-BuOH system to give the corresponding disulfides.
     在SmI_2-HMPA-THF-t-BuOH体系中,硫代碳酸酯的酰硫键发生还原断裂反应,得到相应的二硫醚产物。
短句来源
     SYNTHESIS OF N-(2-MERCAPTOBENZOYL)-N-(ALKYL/ARYL)-GLYCINES AND THE CORRESPONDING DISULFIDES
     N-(2-巯基苯甲酰)-N-烷基/芳基甘氨酸及其双硫化物的合成
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  disulfides
We believe that due to the exchange reactions between the thiamine thiol form and S-nitrosocysteine protein residues, nitric oxide can be released and mixed thiamine-protein disulfides are formed.
      
The mixed thiamine disulfides (including thiamine ester disulfides) as well as the thiamine disulfide form are quite easily reduced by low molecular weight thiols to form the thiamine cyclic form with a closed thiazole ring.
      
Procedures are developed for determining volatile sulfur-containing impurities, hydrogen sulfide, simple mercaptans, sulfides, and disulfides in air and aqueous solutions.
      
Disulfides are reduced by sodium sulfite before their determination.
      
Synthesis and Antioxidative Effect of Aromatic Disulfides
      
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In the previous paper, we reported the formation of bis(O,O-diethyldithiophosphate) disulfide as an intermmediate product in the course of chlorination of O,O-diethyldithiophos phoric acid. During the past decade, much effort has been directed towards the synthesis of mixed phosphoric esters and esters of phosphoric anhydrides, some of them being found as powerful insecticides. The disulfide with the general, known as "phos phatogen," has not been closely investigated, and apart from isolated cxamples, little...

In the previous paper, we reported the formation of bis(O,O-diethyldithiophosphate) disulfide as an intermmediate product in the course of chlorination of O,O-diethyldithiophos phoric acid. During the past decade, much effort has been directed towards the synthesis of mixed phosphoric esters and esters of phosphoric anhydrides, some of them being found as powerful insecticides. The disulfide with the general, known as "phos phatogen," has not been closely investigated, and apart from isolated cxamples, little about this class of compounds has been recorded in the li'erature. Considering their possible insecticidal and fungicidal activities, we prepared a series of the disulfides, aliphatic as well as aromaic, and examined some of their chemical properties.In connection with the investigation stated above, we needed various O,O-dialkyldithiophos phoric acids as intermmediates. The reaction bstween monohydroxy alcohols, polyhydroxy alcohols and different types of phenols with phosphorus pentasulfide were studied. Methyl, ethyl, i-propyl, n-butyl, i-butyl, i-amyl i-amyl and cyclohexyl alcohols reaced with phosphorus pentasulfide smoothly to give O,O-dialkyldithiophosphoric acids in 80-90% yield. The reaction product of polyhydroxy alcohols, namely, ethylene glycol, trimethylene glycol, or glycorol with phosphorus pentasulfide was not homogeneous; we failed to isolate from it the expected product. Although pbenol and β-naphthol reacted with phosphorus pentasulfide equally smoothly, no expected dithiophosphoric acids were obtained from chlorophenols and nitrophenols.Pure sodium salts of the O,O-dialkyldithiophosphoric acids were oxidized by calculated amount of bromine in cold aqueous solution to give the disulfides in 58-85% yield. Eight different disulfides, were propared, where R represents methyl, ethyl, i-propyl, n-butyl, i-butyl, n-amyl, i-amyl, cyclohexyl or phenyl radical. Among these substances only the last one decomposed spontaneously in anhyhrous state within a few days, while the other members were quite stable and unchanged after four months.The disulfides exhibited typical radical or polar cleavage reactions of the unit, since they dissolved in cold aqueous sodium sulfide to form sodium salts of the ditbiophosphoric acid with separation of free sulfur. In alcoholic silver nitrate, they separeted in the form of silver salts of the corresponding dithiophosphoric acids according to the following equation:With alcoholic mercuric chloride, the formation of a double salt instead of the cleavage of -S-S-bond was observed. A series of the double salts with the general formula were prepared, where R represents methyl, ethyl, i-propyi, n-butyl, i-butyl, i-amyl, cyclohexyl or phenyl radical.

本實驗研究了各類醇及酚与五硫化二磷的作用,各種一元醇,苯酚与β-萘酚与五硫化二磷生成相當的二硫代磷酸O,O-二烴基酯,但多元醇,氯代苯酚,硝基苯酚与五硫化二磷作用後,均未得預期的產物。本實驗合成了八種二硫代磷酸O,O-二烴基酯的汞鹽,九種雙(硫代磷酸O,O-二烴基酯)二硫物及八種二硫物的氯化汞複鹽。二硫物是一類比較活潑的化合物,其-S-S-鍵易被離子化藥劑所離解,同時呈一定的氧化性能。二硫物有失去一個硫原子的傾向,硫原子成為游離狀態析出或与金属成硫化物。

Photopolymerization of methyl methacrylate (MMA) has been studied kinetically using several organic disulfides as photoinitiator. Experimental results show that the structural effect of disul'fides on polymerization rate Rp is quite obvious. The initiation activities of various disulfides may be arranged in following order (P-CH3C6S)2 > (t-C4H9S)2>(C6H5CH2S)2, (n-C12H25S)2 and ((G2H5)7NC2H4S)2. The initiation efficiency of di-toluene disulfide (DMDS)can bear comparison with benzoin ethers. The RP...

Photopolymerization of methyl methacrylate (MMA) has been studied kinetically using several organic disulfides as photoinitiator. Experimental results show that the structural effect of disul'fides on polymerization rate Rp is quite obvious. The initiation activities of various disulfides may be arranged in following order (P-CH3C6S)2 > (t-C4H9S)2>(C6H5CH2S)2, (n-C12H25S)2 and ((G2H5)7NC2H4S)2. The initiation efficiency of di-toluene disulfide (DMDS)can bear comparison with benzoin ethers. The RP was found to depend highly on the nature of solvents and is proportional to [MMA] and [DMDS]0.1(N2) or [DMDS]0.2(O2). The singlet and triplet energy of DMDS have been determined to be Es72.2kcal/mol and ET57.3kcal/mol, respectively, which considerably lower than that of conventional vinyl monomers.It indicates that DMDS is qualified as photoinitiator for vinyl polymerization. From the results obtained the initiation mechanism of polymerization is proposed and discussed.

本文对各种有机二硫化物引发甲基丙烯酸甲酯(MMA)的光聚合反应进行了动力学研究,实验结果表明,二硫化物的结构对聚合速度R_p有很大影响,各种二硫化物的引发反应活性可以排列如下:(p-CH_3C_6H_4S)_2>(t-C_4H_9S)_2>(C_6H_5CH_2S)_2,(n-C_(12)H_(25)S)_2和((C_2H_5)_2NC_2H_4S)_2。二甲苯二硫化物(DMDS)引发反应的效果可以和安息香醚类相比拟。 发现R_p和溶剂的性质有很大关系,并且和[MMA]以及[DMDS]~(0.1)(N_2气氛下)或[DMDS]~(0.2)(O_2气氛下)成正比,测得的DMDS的单线态和三线态能量分别为E_s72.2kcal/mol和E_T 57.3kcal/mol,它们比一般烯类单体的能量低,这说明DMDS适于用作烯类光聚合的引发剂。从所得结果讨论了引发聚合的反应机理。

By observation with scanning electronmicroscope, it was found that epipharynx of larvae of the oriental army worm has two pairs of chemoreceptive structures. The morphological characteristics of maxillae are similar as those of other lepidopterous larvae, when toosendanin was topically applied by means of microsyringe at the various points of the mouthparts, it was found that the maxillary palpi and maxilla lobe were the most sensitive targets to toosendanin.On the other hand, the primary site of action of chlordimeform...

By observation with scanning electronmicroscope, it was found that epipharynx of larvae of the oriental army worm has two pairs of chemoreceptive structures. The morphological characteristics of maxillae are similar as those of other lepidopterous larvae, when toosendanin was topically applied by means of microsyringe at the various points of the mouthparts, it was found that the maxillary palpi and maxilla lobe were the most sensitive targets to toosendanin.On the other hand, the primary site of action of chlordimeform was the hypopharynx.The antifeedant action was abolished by mixing toosendanin with cystein or dithio-threitol. The cysteine contains sulphydryls group and dithiothreitol contains disulfides group. These two acture groups are important in the maintenance of the conformation of certain proteins and may influence enzyme activity yor membrane permeadility.The mode of action by which toosendanin may act as an-SH receptor and thereby markedly alters the chemoreceptor function in armyworm larvae was discussed.

粘虫六龄幼虫头部化学感受器扫描电镜观察结果表明,内唇着生有两对腔锥感受器;幼虫下颚的结构与其它鳞翅目幼虫相似。拒食点滴试验结果表明,川楝素的拒食作用部位是下颚;而杀虫脒的作用部位是舌;但加过量半胱氨酸或二硫苏糖醇的川楝素,对下颚须的抑制作用消失。本文探讨了川楝素的有关作用机理和拒食活性部位问题。

 
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