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合成维生素
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  prepare vitamin
     The βmethylnaphthalene can be used to prepare vitamin K, oralcontraceptive and 2,6naphthalene dicarboxylic acid, etc.
     β 甲基萘可用于合成维生素 K、口服避孕药、2 ,6萘二羧酸等。
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  synthetic v
     Production Status and Development Trends of Synthetic V E
     合成维生素E生产现状与发展趋势
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  “合成维生素”译为未确定词的双语例句
     The research on photosynthesis of vitamin D2 and D3 is reviewed.
     综述了光化学法合成维生素D_2和D_3的研究进展.
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     Synthesis of 2,3,5-Trimethylhydroquinone (the Intermediate of Production Vitamin E) by Direct Oxidation
     直接氧化法合成维生素E中间体2,3,5-三甲基氢醌
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     Study on a new process for preparation of vitamine A acetate
     合成维生素A醋酸酯新工艺的研究
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     3,3-Diethoxyethylcyanide was an important precursor for synthesis of vitamin B1,cytosine and its derivatives.
     3,3-二乙氧基丙腈是合成维生素B1、胞嘧啶及其衍生物等重要化合物的前体。
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     Natrual D-α-vitamin E (prepared from natural resources) is qualified cachet of vitamin E for its high quality.
     天然D-α-维生素E是一种高品质的天然维生素E.本文着重介绍天然维生素E的分类、天然D-α-维生素E与合成维生素的差异以及天然D-α-维生素E先进的制备技术;
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  相似匹配句对
     ON THE SYNTHESIS OF METHIONINE METHYL SULFONIUM SALTS(VITAMIN U)
     维生素U的合成
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     Asymmetric Synthesis of Vitamin E
     维生素E的不对称合成
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     N,N,N?
     合成了 N,N,N?
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     Coumarin fluorescent dyes such as C.
     合成了C.
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     Strategies on vitamin E
     猪和维生素E
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  synthetic v
Experimental crystallization of synthetic V-bearing steelmaking slag with Al2O3 doped
      
In congenital nephrogenic diabetes insipidus (NDI) blunted responses of plasma factor VIII, von Willebrand factor, and plasminogen activator to the synthetic V2 analogue 1-desamino-8-d-arginine vasopressin (DDAVP) have been reported.
      
The experimental profile of the dispersion n(ν) has been obtained in the region of the absoprtion band Q(0-0) 575 nm of a solution of synthetic V0 porphyrins in chloroform.
      
The advantage of synthetic V-gene repertoires is that they can be designed and tuned to optimise library function.
      


The preparation of 2, 2-dihydroxycyclohexylidene acetic acid lactone (Ⅳ) as a starting material for the syntheses of 3, 4-cis-triene compounds of the vitamin D type has been studied.Only α-carbethoxy-2-hydroxycyclohexen-(2)-ylidene acetic acid lactone [Ⅷ, m. p.110-111°, λ?? 296 mμ (ε18,600)] was obtained by the treatment of the diethyl 2-ketocyclohexyltartronate (Ⅵ) with acetyl chloride. The structure of Ⅷ was substantiated by results from the decarboxylation and the ozonization of its free acid, α-carboxy-2-hydroxycyclohexen-(2)-ylidene...

The preparation of 2, 2-dihydroxycyclohexylidene acetic acid lactone (Ⅳ) as a starting material for the syntheses of 3, 4-cis-triene compounds of the vitamin D type has been studied.Only α-carbethoxy-2-hydroxycyclohexen-(2)-ylidene acetic acid lactone [Ⅷ, m. p.110-111°, λ?? 296 mμ (ε18,600)] was obtained by the treatment of the diethyl 2-ketocyclohexyltartronate (Ⅵ) with acetyl chloride. The structure of Ⅷ was substantiated by results from the decarboxylation and the ozonization of its free acid, α-carboxy-2-hydroxycyclohexen-(2)-ylidene acetic acid lactone [Ⅸ, m. p. 152-153°(decomp.),λ?? 285 mμ(ε 13,600)]. Ⅸ yields 2-hydroxycyclohexen-(2)-ylidene acetic acid lactone [Ⅻ, b. p. 85-86°/0.15 mm, n_D~17 1.5592,λ?? 274 mμ (ε 12,800)] on pyrolysis at 180°, and glutaric acid together with succinic acid on oxidative ozonization.Ⅵ was saponified to give 2-ketocyclohexyltartronic acid (XIII, m. p.144-145°).The reaction of XIII with hydrogen bromide in glacial acetic acid is quite complicated.It yields 2-ketocyclohexene-(6) acetic acid [XV, m. p. 99-100 , λ?? 240 mμ(ε 8,650)], o-hydroxyphenylacetic acid [XVII, m. p, 146-147°, λ?? 275 mμ(ε 2,250), λ?? 238, 291 mμ(ε 9,120, 3,900)], Ⅻ, the lactone of acid XVII (XVI), and other two unknown substances. XII and XVI were obtained as a mixture,the nature of which has been revealed by the analysis of UV-absorption spectra and the preparation of derivatives like N-benzyl-??-hydroxy-phenylacetamide [XVIII, m.p. 111.5-112.5? ?? 275 m?? (?? 1,390)] and ??-hydroxyphenylacetic phenylhydrazide [XIX,m.p. 181.5-182.5? ?? 276 m?? (?? 4,190)].Pyrolysis of XIII at 140?was successful. From the product there were isolated IV [m.p. 85.5-86.5? ?? 217 m?? (?? 9,790), ?? 249 m??(?? 3,730)] and its isomer,trans-2-ketocyclohexylidene acetic acid [XXI, m.p. 120-121.5? ?? 251 m?? (?? 5,650),?? 251 m?? (?? 6,980)]. The structures of IV and XXI were established by UV-spectral analysis, the preparation of some characteristic derivatives and the ozonization deg-radation. In case of IV, its structure has been further confirmed by its conversion into XII.

本文报告2,2-双羟亚环己基乙酸内酯(Ⅳ)的合成作为纯化学法合成维生素丁类型的3,4-顺-共轭三烯化合物的原料. 2-氧代环己基羟基丙二酸二乙酯(Ⅵ)经乙酰氯脱水未得V,而仅得α-乙氧羰基-2-羟基亚环己烯-[2]-基乙酸内酯(Ⅷ).Ⅷ的结构是根据其水解物α-羧基-2-羟基亚环己烯-[2]-基乙酸内酯(Ⅸ)的脱羧与臭氧化结果而证明. Ⅵ经皂化为2-氧化环己基羟基丙二酸(Ⅷ),再以溴化氢的冰醋酸鲍和溶液处理,反应复杂.产生2-氧代环己烯-[6]-基乙酸(XV)、邻羟基苯乙酸(ⅩⅦ)及其内酯(ⅩⅥ)、2-羟基亚环己烯-[2]-基乙酸内酯(Ⅻ)及其他二种产物. Ⅷ经焦化法脱水脱羧终于获得Ⅳ和其反式异构体2-氧代-反-亚环己基乙酸(XXI).Ⅳ与XXI的结构已由其衍生物制备及臭氧降解结果而加以证明.

Ethynylmagnesium bromide was prepared by reaction of acetylene with ethylmagnesium bromide in tetrahydrofuran. With this Grignard reagent and α,β-unsaturated ketones at low temperature, we obtained several vinylacetylenic alcohols with satisfactory yields. These alcohols are important intermediates in the synthesis of vitamin A.

用乙炔与溴乙基镁在四氢呋喃溶剂中反应以制得溴乙炔镁.将此试剂在低温时与α,β-不饱和酮起反应,制成几种烯炔醇,得到满意的产率.这些产物是合成维生素甲的重要中间体.

The feces of silkworm was found containing extracted chlorlphyll 0.8-1.0% and carotenoid about 0.15%.The feces of silkworm was extracted with acetone, the concentration of acetone had to be controlled at the range of 83-85%. During the removing of the solvent, the temperature of the liquid should be controlled not to exceed 85癈. The crude extract was about 5-6% of the feces of silkworm.Two methods of manufecturing sodium copper chlorophyllin from the crude chlotlphyll were used. The crude extracts were saponified...

The feces of silkworm was found containing extracted chlorlphyll 0.8-1.0% and carotenoid about 0.15%.The feces of silkworm was extracted with acetone, the concentration of acetone had to be controlled at the range of 83-85%. During the removing of the solvent, the temperature of the liquid should be controlled not to exceed 85癈. The crude extract was about 5-6% of the feces of silkworm.Two methods of manufecturing sodium copper chlorophyllin from the crude chlotlphyll were used. The crude extracts were saponified and then extracted with gasoline to remove the nonsaponifiable fraction. The soap was acidified to pH 3 and the copper chlorophyllic acid was obtained by treating it with copper sulfate , then filtered. The residue was dissloved in acetone and convererted into alkali salt by treating with sodium hydroxide. The product, when dry,is known as sodium copper chlorophyllin . Another method was to treat with copper sulfate after saponification.Sodium copper chlorophyllin can be used as medicine for gastric uloer, burna, chronic persistent hepatitis and peplic ulcer.The nonsaponif iable fraction was found containing phytol, triac-ontanol and carotenoid. The phytol can be used as an intermediate for the manufacture of vitamine E and K1;the triacbntanol is a plant growth regulator and can increase the rice yield by spraying on the leaves.

蚕粪是提取叶绿素的良好原料,含量达1%(干物)。用丙酮抽提后回收溶剂可得到糊状叶绿素,得率约5%。加碱皂化后,在酸性条件下与硫酸铜作用生成叶绿素铜酸,再与氢氧化钠反应成为叶绿素铜酸钠盐。可用于治疗慢性、迁延性肝炎,胃、十二指肠溃疡及外用;又可作食用色素。 蚕粪还可提取类葫萝卜素,植物醇和正十三烷醇。植物醇供作合成维生素E及K_1的原料,正三十烷醇是植物生长刺激素,能促进水稻秧苗及白菜的生长。

 
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