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structure
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  结构
    Study on the Structure of Polyolefin Hollow Fiber Membranes and Their Properties for Gas Separation
    聚烯烃中空纤维膜结构及其气体分离性能的研究
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    Structure and Properties of Self-reinforced PE-HD Pipes Extruded from Specially Applied Fields
    在特殊外场下挤出PE-HD自增强管的性能与结构
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    Viscoelastic Property of Viscose Blend Solution and the Structure and Property of Fiber Prepared from It
    共混粘胶的粘弹性及其纤维的成形结构和性能
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    Study on Morphological Structure and Properties of High-Performance Polyolefin Sheets Extruded in Complex Stress Fields
    在复合外场下获取高性能聚烯烃片材及其形态结构与性能的研究
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    On In-Situ Fibrillation of GEP/PO Blends and Their Morphology, Structure and Properties
    GEP/PO共混物的原位成纤及其形态、结构与性能
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    Study on Novel High Effect Herbicides with Substituted Phenyl Isoxazole and Substituted Phenyl Pyrazole Structure
    高效新农药取代苯基异噁唑和取代苯基吡唑类除草剂的研究
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    Structure Modifications and SARs of Taxol's C-2 Position
    紫杉醇C-2位结构改造及构效关系研究
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    Studies on the Distillation、Purification and Molecular Structure of New Agricultural Antibiotic 2507
    新农用抗生素2507提取、纯化和分子结构的研究
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    KINETIC STUDIES ON REACTIONS OF COMPLEX COMPOUNDS. Ⅱ. Initial Velocity of the Reaction and Structure of the Complex of Chromic Ion with Glycine and Alanine.
    络合物反应动力学的研究 Ⅱ.水含铬离子与甘氨酸,α—氨基丙酸络合物的组成及其反应初速
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    Study on Rheoiogical Properties of PVC Plastisois and the Particle Structure
    PVC糊流变性能与颗粒形态的研究
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  structure
The paper studies generic commutative and anticommutative algebras of a fixed dimension, their invariants, covariants and algebraic properties (e.g., the structure of subalgebras).
      
In the case of 4-dimensional anticommutative algebras a construction is given that links the associated cubic surface and the 27 lines on it with the structure of subalgebras of the algebra.
      
We study the multiplicative structure of rings of coinvariants for finite groups.
      
Fibonacci manifolds have a hyperbolic structure which may be defined via Fibonacci numbers.
      
In this paper we prove that the homogeneous spaceG/K has a structure of a globally symmetric space for every choice ofG andK, especially forG being compact.
      
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Aureomycin (Ⅰ) on reduction with zinc-acetic acid gives desdimethylaminoaureomycin (Ⅱ) under mild conditions and desdimethylaminodesoxyaureomycin (Ⅲ) under more drastic conditions. Ⅱ can be converted into Ⅲ by further reduction. Treatment of Ⅰ, Ⅱ or Ⅲ with concentrated hydrochloric acid or methanolic HCl produces anhydroaureomycin (Ⅳ), desdimethylaminoanhydroaureomycin (Ⅴ) or desdimethylaminodes- oxyanhydroaureomycin (Ⅵ) respectively. Compound (Ⅴ) can be obtained from Ⅳ by hydrogenolysis, and, similarly, Ⅵ...

Aureomycin (Ⅰ) on reduction with zinc-acetic acid gives desdimethylaminoaureomycin (Ⅱ) under mild conditions and desdimethylaminodesoxyaureomycin (Ⅲ) under more drastic conditions. Ⅱ can be converted into Ⅲ by further reduction. Treatment of Ⅰ, Ⅱ or Ⅲ with concentrated hydrochloric acid or methanolic HCl produces anhydroaureomycin (Ⅳ), desdimethylaminoanhydroaureomycin (Ⅴ) or desdimethylaminodes- oxyanhydroaureomycin (Ⅵ) respectively. Compound (Ⅴ) can be obtained from Ⅳ by hydrogenolysis, and, similarly, Ⅵ from either IV or V. All the above compounds, (Ⅰ), (Ⅱ), (Ⅲ), (Ⅳ), (Ⅴ) and (Ⅵ), when subjected to zinc dust distillation, form naphthacene. A comparison of the ultra-violet absorption spectra of Ⅰ, Ⅱ, Ⅲ, Ⅳ, Ⅴ and Ⅵ affords a supplementary evidence for the location of the angular-OH group in the structure of aureomycin.

金黴素(I)在冰醋酸與甲醇溶液中,用鋅粉氫解,在温和條件下,產生脫二甲胺金黴素(II);較劇烈條件下,則生成脫二甲胺脫羥金黴素(III)。III從II經鋅粉醋酸氫解得到。 I,II,III分別與濃鹽酸或甲醇鹽酸處理相應地得到脫水金黴素(IV),脫二甲胺脫水金黴素(V)及脫二甲胺脫羥脫水金黴素(VI)。脫水金黴素(IV)經鋅粉醋酸氫解亦產生V與VI。VI亦可從V製成。 I,II,III,IV,V或VI和鋅粉共同蒸餾,皆得到并四苯。 從紫外吸收光譜測定,對金黴素結構中二甲胺基及角羥基的位置有補充的說明。

Desdimethylaminoaureomycin (Ⅳ) and desdimethylaminodesoxyaureomycin (Ⅴ), when subjected to catalytic hydrogenation, yield deschlorodesdimethylaminoaureomycin (Ⅶ) and deschlorodesdimethylaminodesoxyaureomycin (Ⅷ) respectively. On warming with methanolic hydrogen chloride, Ⅶ and Ⅷ give their corresponding anhydro-compounds: deschlorodesdimethylaminoanhydroaureomycin (Ⅹ) and deschlorodesdimethylaminodesoxy- anhydroaureomycin (Ⅺ). On catalytic hydrogenation, anhydroaureomycin (Ⅵ) is converted into deschloroanhydro-...

Desdimethylaminoaureomycin (Ⅳ) and desdimethylaminodesoxyaureomycin (Ⅴ), when subjected to catalytic hydrogenation, yield deschlorodesdimethylaminoaureomycin (Ⅶ) and deschlorodesdimethylaminodesoxyaureomycin (Ⅷ) respectively. On warming with methanolic hydrogen chloride, Ⅶ and Ⅷ give their corresponding anhydro-compounds: deschlorodesdimethylaminoanhydroaureomycin (Ⅹ) and deschlorodesdimethylaminodesoxy- anhydroaureomycin (Ⅺ). On catalytic hydrogenation, anhydroaureomycin (Ⅵ) is converted into deschloroanhydro- aureomycin (Ⅳ), which, on further hydrogenation with zinc-acetic acid, produces a mixture of Ⅹ and Ⅺ. A comparison of the ultra-violet absorption spectra of Ⅶ, Ⅷ, Ⅸ, Ⅹ with the cor- responding degradation products of terramycin, Ⅻ, (XIII), (XIV), (XV), provides further evidence for the similarity of the structures between aureomycin and terramycin.

脫二甲胺金黴素(IV),脫二甲胺脫羥金黴素(V)分别予以接觸氫化,產生脫氯脫二甲胺金黴素(VII)及脫氯脫二甲胺脫羥金黴素(VIII)。這兩種產物再分別以甲醇鹽酸處理,得到它們相當的脫水化合物:脫氯脫二甲胺脫水金黴素(X)及脫氯脫二甲胺脫羥脫水金黴素(XI)。脫水金黴素(VI)經接觸氫化。產生脫氯脫水金黴素(IX)。後者用鋅粉醋酸氫解,亦得到Ⅹ與Ⅺ。

1. The alkaloid contents of Chinese gelsemium (G. elegans Benth.) have been reinvestigated. Various procedures of isolation of the alkaloids were compared and a more efficient one developed. The present authors isolated besides previously reported koumine,kouminidine and gelsemine two new minor alkaloids:koumicine, m. p. 232-4°and koumidine, m. p.202-4°.However, sempervirine and kounidine were not obtained.Empirical formulae C_26H_30N_2O_4 and C_19H_22N_2O are provisionally assigned to koumicine and koumidine,...

1. The alkaloid contents of Chinese gelsemium (G. elegans Benth.) have been reinvestigated. Various procedures of isolation of the alkaloids were compared and a more efficient one developed. The present authors isolated besides previously reported koumine,kouminidine and gelsemine two new minor alkaloids:koumicine, m. p. 232-4°and koumidine, m. p.202-4°.However, sempervirine and kounidine were not obtained.Empirical formulae C_26H_30N_2O_4 and C_19H_22N_2O are provisionally assigned to koumicine and koumidine, respectively, and spectral evidences indicate that both these alkaloids are of indole type. The unconventional formula of kouminidine, C_19H_25O_4N_2, is revised to C_20H_26N_2O_4.Preliminary considerations based on UV and IR spectra suggest that kouminidine is possibly an indolenine type alkaloid with a zwitterionic structure.2. The constitution of koumine, the main alkaloid of Kou-Wen, has been preliminarily studied on spectral as well as on chemical ground. It is proposed that, in contrast to gelsemine, koumine probably possesses a pseudoindole ring system. Although gelsemine and koumine both contain an exo-vinyl, an Nb-methyl and most likely a cyclic ether linkage, the structures of the alicyclic parts of these two alkaloids appear also different from each other.

1.重研究了国产钩吻生物碱,比较和改良这些生物碱的提取方法.除获得前人曾经报告的钩吻素子、钩吻素卯和钩吻素甲以外,还得到了两种新的次要生物碱,钩吻素丁和钩吻素戊,但未得钩吻素丙和钩吻素辰.钩吻素丁熔点232-234°,实验式暂定为C_(26)H_(30)N_2O_4;钩吻素戊熔点202-204°,实验式暂定为C_(19)H_(22)N_2O;从紫外光谱推断,二者都是吲哚类型的生物碱.并修正钩吻素卯的实验式为C_(20)H_(26)N_2O_4,从紫外及红外光谱初步推测,它可能是一种内盐式的假吲哚类型生物碱. 2.对国产钩吻中的主要生物碱钩吻素子的化学结构作了初步解析.从光谱及化学证据推断,钩吻素子与钩吻素甲具不同的发色系统,前者属于假吲哚型,而后者已知是属于2-氧吲哚型的.虽然这两种生物碱都含环外乙烯基,N_b-甲基及可能具环醚结构,但是其脂环部分的构造按推断亦不相同.

 
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