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herbicides
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  除草剂
    Using Molecular Graphics, Molecular Mechanics, Quantum Chemistry and Electrostatic Potential Methods to Study Structure-Property Relationship on Pesticides(Ⅳ) --Study on Characteristics of Conformations of Sulfonylureas Herbicides by MMX and Conf
    应用分子图形学、分子力学、量子化学及静电势研究农药分子结构与性能关系(Ⅳ)——应用MMX及构象重叠方法研究磺酰脲类超高效除草剂的构象特征
短句来源
    Design, Syntheses and Biological Activity of Novel Herbicides Targeted ALS(Ⅲ)─Crystal and Molecular Structure of 5,7-Dimethyl-N-(substitutedphenyl)-1, 2, 4-triazolo [1,5-a] pyrimidine-2-sulfonamide
    以ALS为靶标的新型除草剂的分子设计、合成及生物活性研究(Ⅲ)──5,7-二甲基-N-(取代苯基)-1,2,4-三唑并[1,5-a]嘧啶-2-磺酰胺的晶体及分子结构
短句来源
    USING MOLECULAR GRAPHICS, MOLECULAR MECHANICS,QUANTUM CHEMISTRY AND ELECTROSTATIC POTENTIAL METHOD TO STUDY STRUC-TURE PROPERTY RELATIONSHIP OF PESTICIDES (ⅩⅡ) —STUDY THE CLASSIFICATION BETWEEN THE STRUCTURES OF SULFONYLUREA HERBICIDES' HE
    应用分子图形学、分子力学、量子化学及静电势研究农药分子结构与性能的关系(ⅩⅡ)——化学模式识别对磺酰脲类除草剂杂环结构与活性关系的分类研究
短句来源
    Simultaneous Determination of Sulfonylurea Herbicides Residues in Soybeans by High Performance Liquid Chromatography Mass Spectrometry
    高效液相色谱-质谱法测定大豆中磺酰脲类除草剂多残留量的研究
短句来源
    Quantitative Determination of Sulfonylurea Herbicides in a Paddy Soil at Trace Level by Capillary Electrophoresis
    毛细管电泳定量测定稻田土壤中痕量磺酰脲类除草剂残留
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  “herbicides”译为未确定词的双语例句
    Study on Quantitative Structure Activity Relationship of Fluorine-containing Amide Herbicides by Reversed-phase High-performance Liquid Chromatography
    用反相高效液相色谱研究含氟酰胺类新农药的定量构效关系
短句来源
    USING MOLECULAR GRAPHICS, MOLECULAR MECHANICS, QUANTUM CHEMISTRY AND ELECTROSTATIC POTENTIAL METHODS TO STUDY STRUCTURE-PROPERTY RELATIONSHIP ON PESTICIDES (Ⅶ )─A STUDY OF THE AFFECTION OF CONFORMATION DIFFERENCE OF SULFONYLUREAS HERBICIDES ON A
    应用分子图形学、分子力学、量子化学及静电势研究农药分子结构与性能关系(Ⅶ)──磺酰脲分子构象差异对活性影响的ANN研究
短句来源
    Simultaneous Determination of Residues of 12 Amide Herbicides in Soybeans by High Performance Liquid Chromatography
    高效液相色谱法同时测定大豆中12种酰胺类除草剂的残留量
短句来源
    (2) Detection of the two phenoxyacetic herbicides residues by LC/MS.
    (二)以LC/MS同时分析测定了2,4-D和2,4,5-T。
短句来源
    1. The best chromatographic conditions were UV detection wavelength of 250nm, mobile phase of methanol/water at 60/40(v/v), mobile phase flow rate of 0.7mL/min, column temperature of 35 , the column used was ODS, were used to determine the phenylurea herbicides in the environment.
    通过试验确定:分析柱为ODS柱,检测波长为250nm,流动相为甲醇/水=60∶40(v/v),流速为0.7mL/min,柱温为35℃。
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  herbicides
2-C-methylerythritol phosphate pathway of isoprenoid biosynthesis as a target in identifying new antibiotics, herbicides, and im
      
MEP-pathway of isoprenoid biosynthesis is a promising target in identifying new herbicides, immunomodulators, and other physiologically active compounds.
      
This process was considerably stimulated by illumination and suppressed by the herbicides DCMU (an inhibitor of the electron transfer between quinones QA and QB in PS II) and methyl viologen (an electron acceptor from PS I).
      
Optimizing Separation Conditions for Chlorophenoxycarboxylic Acid Herbicides in Natural and Potable Water Using Capillary Zone E
      
Chlorophenoxycarboxylic acid herbicides were separated and determined by capillary electrophoresis.
      
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A series of trisubstituted thioureas have been made by the reaction of the primary aromatic amines, carbon disulfide, dimethylamine and a small amount of sodium hydroxide in a 95% ethanol solution. One of the products, 3-(p-chlorophenyl)-1,1-dimethylthiourea, has been tested in the laboratory and in the field as a good herbicide as CMU, 3-(p-chlorophenyl)-1,1-dimethylurea. In comparison with the latter, it takes longer periods for the killing, but is soluble in alcohol and some other common organic solvents.2-Nitro,...

A series of trisubstituted thioureas have been made by the reaction of the primary aromatic amines, carbon disulfide, dimethylamine and a small amount of sodium hydroxide in a 95% ethanol solution. One of the products, 3-(p-chlorophenyl)-1,1-dimethylthiourea, has been tested in the laboratory and in the field as a good herbicide as CMU, 3-(p-chlorophenyl)-1,1-dimethylurea. In comparison with the latter, it takes longer periods for the killing, but is soluble in alcohol and some other common organic solvents.2-Nitro, 2,4-dinitro-aniline, 2-aminophenol, and 2-aminopyridins do not react with carbon disulfide. This is probably due to the fact that the former three compounds may form chelates through the amino group and the 2-substituents so that no reaction can take place, while the last compound is anologous to an amide, so that one of the hydrogen atoms on the amino-nitrogen may tautomerise between the two nitrogen atoms.If the position next to the amino group is occupied by a bulky group, such as o-iodoaniline, the yield is considerably decreased. This is probably due to the "steric hindrance".

应用芳伯胺、二甲胺、二硫化碳及少量粉状氢氧化钠在乙醇溶液内反应,可制成多种三取代硫脲,其中3-(对氯苯基)-1,1-二甲基硫脲为优良的除莠剂,经试验证明其效力与3-(对氯苯基)-1,1-二甲基脲相仿,惟杀草所需时间要长些,但易溶于乙醇及其他价廉的有机溶剂. 2-硝基苯胺、2,4-二硝基苯胺、2-羟基苯胺及2-氨基吡啶与二硫化碳及二甲胺作用均得不到硫脲衍生物,可能是由于苯环上的硝基或羟基与邻位的胺基生成五环或六环内络合物.2-氨基吡啶的结构与酰胺相似,氨基上的氢原子可与环上的氮进行互变异构作用也不生成硫脲. 若在氨基邻位上有一较大的基团,则产率大受影响,这可能是由于“位阻”所致.

Six new substituted compounds of urea of the general formulaCHNHCNR1R2(R1=H, R2=C1-3 alkyl, or R1=R2=C1-3 alkyl) have beenprepared by the reactions of a styrylisocyanate with appropriate alkyl-amines. The yields of these compounds are mostly over ninety percent.By the reactions of α-methylbenzyl or p-chloro-α-methylbenzyl isothio-cyanates with different alkylamines, twelve new substituted thioureas havebeen synthesized. Their general formula is X- -CHNHCNR1R2 (R1 andR2 are the same as above; X=Cl, H). The yields...

Six new substituted compounds of urea of the general formulaCHNHCNR1R2(R1=H, R2=C1-3 alkyl, or R1=R2=C1-3 alkyl) have beenprepared by the reactions of a styrylisocyanate with appropriate alkyl-amines. The yields of these compounds are mostly over ninety percent.By the reactions of α-methylbenzyl or p-chloro-α-methylbenzyl isothio-cyanates with different alkylamines, twelve new substituted thioureas havebeen synthesized. Their general formula is X- -CHNHCNR1R2 (R1 andR2 are the same as above; X=Cl, H). The yields of most of the products are over eighty percent.An attempt has been made to synthesize the above substituted thioureas by means of One Step Method, namely, the direct reaction of substituted benzylamine,alkylamine and carbon disulfide. The result shows that whereas dimethylamine can react successfully with the benzyl- or substituted benzylamine and carbon disulfide to give the corresponding substituted thioureas with yields of about seventy percent. Methylamine did not react normally, and the products are mainly sym-dibenzyl or sym-di-substituted benzyl thioureas.Bioassay for these compounds shows that they have herbicidal activi-ties, some of which rank higher than HERBICIDE No. 1 Cl- -NHCN(CH3)2.

用苯乙烯基异氰酸脂与脂肪胺反应合成了6个新的N-苯乙烯基脲化合物,产品收率多在90%以上。通过α-甲基苄基和对氯α-甲基苄基异硫氰酸脂与脂肪胺反应制备了12个新的N-苄基衍生物。产品收率多在80%以上。初步探讨了“一步法”,即苄胺或取代苄胺与脂肪胺。二硫化碳直接作用合成相应的N-苄基硫脲衍生物的可能性。对所合成的新化合物进行了初步生测,结果表明它们都有不同程度的除草活性。其中有几个化合物除草活性高于除草剂1号

The series product of dithiocarbamate is a kind of herbicide, α-methylbenzyl N,N-dicthyldithiocarbamatc (C15H19NS2) and benzyl N-morpholinyl dithiocarbamate (C12H15NOS2) have different biological activity to universal weeds of dryfarmland and paddyfield.Both kinds of crystal bolong to orthorhombic system with space group Pbca, there are eight molecules in a unit cell, the lattice parameters.Ⅰ a = 21.422A, b=14.645A, c = 8.769A; Ⅱ a = 22.191A, b=12.335A, c = 9.404A.The structures were solved by MuLTAN 78...

The series product of dithiocarbamate is a kind of herbicide, α-methylbenzyl N,N-dicthyldithiocarbamatc (C15H19NS2) and benzyl N-morpholinyl dithiocarbamate (C12H15NOS2) have different biological activity to universal weeds of dryfarmland and paddyfield.Both kinds of crystal bolong to orthorhombic system with space group Pbca, there are eight molecules in a unit cell, the lattice parameters.Ⅰ a = 21.422A, b=14.645A, c = 8.769A; Ⅱ a = 22.191A, b=12.335A, c = 9.404A.The structures were solved by MuLTAN 78 and RANTAN respeetively and refined by block-diagonal least squares method, their final R-factor are 0,092 and 0.109 respectively.The herbicide effect of crystal Ⅰ is better than that of the crystal Ⅱ, we think this is bound with obstacle of structures in the space.

本文报导了对较普遍的水田和旱田杂草有不同活性的两个化合物除草剂,讨论了它们的结构与活性的关系,两个化合物的晶胞参数a_Ⅰ=21.422、b_Ⅰ=14.645,C_Ⅰ=8.769;a_Ⅱ=22.191、b_Ⅱ=12.355、c_Ⅱ=9.404,空间群均为P_(b c a)、Z=8,分别用MuLTAN和RANTAN测定其结构,用块对角线最小二乘法修正,最冶R_Ⅰ=0.092、R_Ⅱ=0.108。

 
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