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extracts
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  提取物
    STUDY ON ADHESIVE FROM EXTRACTS OF PEANUT HULLS
    花生壳提取物制胶粘剂的研究
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    By using the 10L-V type low-speed counter-current chromatography and the petroleum ether/ ethyl acetate/ butanol/ water (0.5: 1: 2: 6) as the solent system, the experiment on the separation of EGCG in the tea extracts was conducted.
    采用10L-V型低速逆流色谱,以石油醚/乙酸乙酯/正丁醇/水(0.5:1:2:6)为溶剂系统,对茶提取物中的EGCG进行了分离实验。
    Take 150 g of tea extracts containing 29.6% EGCG and separated around 71.5 h, 45 g of EGCG product with 92.7% purity was obtained. The productivity per unit time was 0.55 g/ h, 10 times higher than that of GS-10A high-speed counter-current chromatographic method .
    含EGCG 29.6%的茶提取物150g,经过约71.5小时的分离,获得92.7%的EGCG产品45g,单位时间的生产效率为0.55S/小时,是GS-10A高速逆流色谱的10倍。
    Inhibition of Tyrosinase Activity by Extracts of Several Chinese Medicinal Herbs
    几种中药提取物对酪氨酸酶活性的抑制
短句来源
    Study on Antioxidant Activity of Extracts from Peanut Hulls
    花生壳提取物的抗氧化活性研究
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    STUDY ON THE AXLE SEALING OF PUMP USED IN TANNIN EXTRACTS INDUSTRY
    栲胶泵轴密封的研究——副叶轮动力密封和飞球离心式机械停车密封装置
短句来源
    ISOLATION AND DETERMINATION OF WATER EXTRACTS OF LARCH BARK
    落叶松树皮水浸提物组分的分离测定
短句来源
    THE EXTRACTION STUDY OF EXTRACTION REAGENT (S_(612)-S_(610)) FOR PHOSPHORIC ACID 2. The Extraction (S_(612)-S_(610)) Extracts Phosphric Acid Several Grades Extraction
    [S_(612)—S_(610)]萃取剂对磷酸的萃取研究——多级萃取
短句来源
    HPLC similarity of the extracts before and after removing heavy metals by resin A was higher than 0.97,but that by resin B was very low.
    应用树脂A脱除重金属前后干膏的HPLC图谱相似度大于0.97,应用树脂B脱除重金属前后干膏的HPLC图谱相似度很低。
短句来源
    The yield of extracts was 3.573% in optimal conditions.
    在此条件下,黄酮得率为3.573%。
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  extracts
The aqueous and solvent extracts when tested against 11 gram-negative and 2 gram-positive bacteria and 3 fungi expressed activity to most of the organisms.
      
Methanol extract showed more activity amongst all the solvent extracts, particularly remarkable activity recorded against gram-positive bacteria.
      
Aqueous and organic solvent extracts tested by agar-well diffusion method against 12 human pathogenic bacteria and 3 fungal strains showed activity to most of the organisms.
      
Fermentation broth and cell extracts were tested against typed test organisms.
      
The activity profiles of the intracellular and extracellular crude extracts showed that the antibiotic producing culture produces two or more compounds, one being intracellular (antifungal), other being extracellular (antibacterial).
      
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Crystalline bovine insulin has been synthesized from the S-sulphonate derivatives of synthetic A-and natural B-chains of bovine insulin, and the A-chain derivative (Ⅰ) has been prepared from synthetic peptide intermediates. C-Terminal dodecapeptide (Ⅴ), directly prepared from asparagine, was decarbobenzoxylated and coupled with N-terminal nonapeptide hydrazide (Ⅳ) by the azide method to give heneicosapeptide (Ⅵ). The crude product without purification was treated with sodium-liquid ammonia as usual. The deblocked...

Crystalline bovine insulin has been synthesized from the S-sulphonate derivatives of synthetic A-and natural B-chains of bovine insulin, and the A-chain derivative (Ⅰ) has been prepared from synthetic peptide intermediates. C-Terminal dodecapeptide (Ⅴ), directly prepared from asparagine, was decarbobenzoxylated and coupled with N-terminal nonapeptide hydrazide (Ⅳ) by the azide method to give heneicosapeptide (Ⅵ). The crude product without purification was treated with sodium-liquid ammonia as usual. The deblocked product was partially purified by precipitation with acetic acid at pH 3.8. The precipitate was dissolved in 0.2 M Tris buffer (pH 8.1) and converted into the S-sulphonate by treatment with sodium sulphite and sodium tetrathionate. After dialysis followed by desalting with sephadex G25, the S-sulphonate product was further purified by paper-chromatography and the purified product (Ⅰ) obtained has [α]_D~(22)-68° (c 1.0, water) and behaved on paper chromatography [(R_f 0.25, n-BuOH: HOAc:H_2O(5:1:4)] and paper electrophoresis (migration distance 8.5 cm, 45v./cm, 90min., pH 1.9, HCOOH:HOAc:H_2O (3:2:15) (4M urea), Whatman 3 MM) as a homogeneous substance, just the same as the S-sulphonate of the A-chain of natural bovine insulin. N-Terminal amino acid determination further confirmed the homogeneity of the substance. Amino acid analysis of its acid hydrolysate gave following molecular ratios: Gly_(0.9)Ile_(0.9)Val_(2.0)Glu_(4.3)Ala_(0.9)Ser_(2.0)Leu_(2.0)Tyr_(1.9)Asp_(2.2) (cysteine being not determined). Synthetic S-sulphonate Ⅰ (5 mg) without purification by paper chromatography was directly reduced together with the S-sulphonate (Ⅱ) of the B-chain of natural bovine insulin (5 mg) in an acetate buffer (pH 5.0) by thioglycolic acid at 20°, and then acidified to pH 3.8. The precipitated product was suspended in glycine buffer (0.2 M, pH 10.6) and oxidized at 3—5° by air. The oxidation product was acidified to pH 5.0. The precipitate was dissolved in diluted ammonium hydroxide and lyophilized (8 mg as determined by Folin's method). It showed a biological activity of about 5—10% of natural bovine insulin (23.7 IU/mg) by the mouse convulsion test. The active oxidation product (68 mg) was extracted according to the known method with the upper phase of the solvent system sec-butanol-acetic acid-water (100: 1: 99), and the butanol layer was reextracted with the hypophase of the same system. The aqueous layer was finally lyophilized, and the product (4 mg of an activity of 60—70% of natural insulin) was crystallized from a mixture of acetone and aqueous citric acid solution containing zinc ions (1% citric acid, 16% acetone and 0.13% zinc acetate) in the same form as the natural hormone. After recrystallization from the same mixture, the synthetic crystalline product (Ⅲ) showed an insulin activity of 20—23 IU/mg (results from four repeated experiments) of about the same activity as the natural crystalline hormone. The recrystallized product (Fig. 4) appears homogeneous on paper electrophoresis and paper chromatography (Fig. 5 & 6) and behaves in a manner similar to natural bovine insulin. All above results and other supporting evidences showed that we have succeeded in the synthesis of the A-chain of bovine insulin and that the active crystalline product from the partial synthesis is crystalline bovine insulin.

本文报导了牛胰岛素A链的S-磺酸盐(Ⅰ)的合成以及自Ⅰ和天然B链S-磺酸盐(Ⅱ)组合为结晶牛胰岛素的半合成。十二肽酸Ⅴ脱N-保护基后,与九肽酰肼Ⅳ经迭氮化物法缩合得带保护基的A链(Ⅵ),粗产物经钠-液氨处理去保护基后,用乙酸缓冲液调至pH 3.8以除去部分杂质,然后进行S-磺酸化。经纸层析纯化的S-磺酸盐Ⅰ,其旋光率、纸电泳和纸层析的行为、氨基酸组成以及末端分析数据均与天然牛胰岛素A链S-磺酸盐的相符。产物Ⅰ与天然胰岛素B链S-磺酸盐经巯基乙酸还原和空气氧化后,得到的粗产物的生物活力相当于天然牛胰岛素活力的5—10%,经仲丁醇-乙酸柚提后,活力可提高5—10倍,抽提物再经含乙酸锌的丙酮-柠檬酸缓冲液纯化,可得结晶产物Ⅲ,其晶形与天然牛胰岛素相同,其活力(20—23国际单位/毫克)与后者相仿。上述结果及其他证据都证明我们已合成了牛胰岛素A链和所获得的半合成结晶产物就是结晶牛胰岛素。

The cross-linked polymers formed by heat-curing of seven anhydrides and their eutectic mixtures with bisphenol A epoxy resin can be hydrolyzed in benzene-alcoholic sodium hydroxide solution. On acidifying and extracting the precipitates (sodium salt of dibasic acids) which are insoluble in organic solution, their corresponding dibasic acids can be obtained. Single dibasic acid can be identified by infrared spectroscopy while mixed dibasic acids have to be differentiated by paper chromatography in isopro-panol-ammonia...

The cross-linked polymers formed by heat-curing of seven anhydrides and their eutectic mixtures with bisphenol A epoxy resin can be hydrolyzed in benzene-alcoholic sodium hydroxide solution. On acidifying and extracting the precipitates (sodium salt of dibasic acids) which are insoluble in organic solution, their corresponding dibasic acids can be obtained. Single dibasic acid can be identified by infrared spectroscopy while mixed dibasic acids have to be differentiated by paper chromatography in isopro-panol-ammonia system. The epoxy resin cured with maleic anhydride yields fumaric acid and small amount of maleic acid upon hydrolysis and separation. The content of fumaric acid increases with elevation of curing temperature and thus proves that the occurence of this cis-trans isomerization should rather be attributed to the influence of heat during the course of cure than to the action of chemicals upon hydrolysis and acidification.

七种酸酐或它们的低共熔混合物与双酚A环氧树脂加热固化成交联聚合物后,可用氢氧化钠的苯-乙醇混合溶液来水解,不溶解于有机溶液中的沉淀物(二元酸的钠盐)经酸化与乙醚萃取可得到相应的二元酸。单一的二元酸可用红外光谱法鉴定,而混合二元酸则必须在异丙醇-氨水展开剂中用纸层析来鉴别。用顺丁烯二酸酐固化的环氧树脂经水解与分离后得到的主要是反丁烯二酸和少量顺丁烯二酸,前者的含量随固化温度的提高而增多,因而确证这一顺-反异构化反应是在固化过程中受热,而不是在水解,酸化时受化学试剂的作用产生的。

After the graft copolymer of styrene-divinyl benzene-rubber had been extracted first with petroleum ether and then with a mixture of methyl ethyl ketone and me-thanol in the soxhlet extractor in order to get rid of the linear polymer, the degree of unsaturation was determined. From the experimental results, it was shown that the degree of unsaturation in the graft copolymer of S-DVB-R was not decreased.The graft copolymer which, having been extracted, possesses higher swelling coefficient than that...

After the graft copolymer of styrene-divinyl benzene-rubber had been extracted first with petroleum ether and then with a mixture of methyl ethyl ketone and me-thanol in the soxhlet extractor in order to get rid of the linear polymer, the degree of unsaturation was determined. From the experimental results, it was shown that the degree of unsaturation in the graft copolymer of S-DVB-R was not decreased.The graft copolymer which, having been extracted, possesses higher swelling coefficient than that of the copolymer of S-DVB was chlbromethylated and aminated by the ordinary method. It was discovered that it took a longer time for the chlorome-thylation of copolymer containing rubber than that, it did not contain any. The pro-duet thus obtained was tested for mechanical strength under wet condition, it was found that the granular particles with an average diameter of 0.64 mm were not broken until an average weight of 700 g was addend on.They also had a better elasticity and tenacity.By the indicator method, the exchange velocity of the newly prepared resin was ditermined with hydrochloric acid. The diffusion coefficient was calculated according to the method adopted by Keichenbery. The result showed that the new resin possesses a higher diffusion coefficient.The new resin also possesses higher water content and lower density than those of the ordinary resin.

本文用橡胶-苯乙烯-二乙烯基苯合成了接枝共聚体,用石油醚和丁酮,甲醇混合液在 Soxhlet提取器上对共聚体实行提取以后,进行了氯甲基化与铵化,实验证明,制得的新树脂具有明显的弹性,韧性和良好的耐压性质,普通的凝胶型树脂很脆,当形变10%时开始破碎,耐压只有200—300克,而新树脂形变可达20%以上而不破坏,耐压可达700克,本文同时对新树脂的含水量,密度,交换速度也进行了研究。

 
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