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extracts
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  提取物
    Study on Antioxidant Activity of Extracts from Sweet Potato and Potato
    甘薯及马铃薯提取物的抗氧化活性研究
短句来源
    The result showed that the antioxidant activities were in the order:70% acetone extract > 70% ethanol extract > 70% methanol extract. It was correspond with the contents of total phenolics and proanthocyanidins in different extracts.
    结果表明,不同提取物在三个体系中都具有较强的抗氧化性质,抗氧化能力的大小顺序为:70%丙酮提取物>70%乙醇提取物>70%甲醇提取物,并且抗氧化能力的大小与提取物中总酚和原花青素的含量高低相一致。
短句来源
    The Rf of β-sitosterol sample was 0.272 and the Rf of extracts was 0.268 . The average content of β-sitosterol in extract was 2.02% .
    在最佳料液比下提取之后,提取物中β-谷甾醇平均含量为2.02%。
短句来源
    The results show that the estered catechins can be decomposited into simple catechins effectively when the corresponding amount external tannase with the content of estered catechins is added to green tea coarse filtrated liquid on the condition of 40 ℃ and 2 hours’ enzymatic decomposition,and then tea extracts lost its bitter character,moreover,the yield rate of amino acid,tea polyphenol,caffeine and water extracts can increase 5.56%,6.18%,11.17%,3.53% in sequence.
    结果表明,根据绿茶粗滤液中酯型儿茶素的含量添加相应活性单位的外源单宁酶,在40℃酶解2 h,主要苦味成分酯型儿茶素能够有效地降解为简单儿茶素,达到提取物的无苦味,并且酶解液中的氨基酸、茶多酚、咖啡碱、水浸出物等品质成分的得率依次增加5.56%,6.18%,11.17%,3.53%.
短句来源
    when 50μL 0.2% three extracts of Terminalia chebula Rotz were respectively added in filters and caporal of cigarette,the scavenging percentage of 85% alcohol extracts from Terminalia chebula Rotz is the highest(34.1%).
    在香烟滤嘴和烟丝中分别添加50μL 0.2%诃子的3种提取物时,85%乙醇提取物对香烟烟气自由基的清除率最高(34.1%)。
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    Study on Antioxidation and other Healthy Function of the Extracts from Citrus Peel
    柑桔皮提取液抗氧化及其它保健功能研究
短句来源
    Study on the Phenomena of Precipitation of Vegetable Tannin Extracts During Tanning Process
    植鞣过程中栲胶沉淀的原因研究——第Ⅰ部分
短句来源
    Study on the Thin-layer Chromatographic Characteristics of Several Domestic Vegetable Tannin Extracts
    我国常用植物鞣剂薄层色谱特征的研究
短句来源
    Choosing high quality CO_2 hop extracts
    选用优质CO_2酒花浸膏酿造优质啤酒
短句来源
    Results show that: 1) when the method of ammonium sulfate salting-out is applied to purify phycoerythrin from porphyra yazoensis crude extracts with an absorbance ratio(OD 561 /OD 280 ) of 0.365, a product with OD 561 /OD 280 of 0.45 and recovery yield of 67.33% is obtained .
    结果显示:1)对藻红蛋白纯度(以OD561/OD280表示)为0.365的条斑紫菜粗提物采用盐析法沉淀藻红蛋白时,得到藻红蛋白的纯度为0.45,回收率为90.53%;
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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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Litchi is a famous fruit indigenous to southern China.When the fruit is fully ripe it is beautifully bright red,but the color fades rapidly and turns dull brown a few days after being kept at room temperature.In order to find out what is the active agent responsible for the rapid browning of the fruit,a study was made of the oxidizing enzy- mes present in the fruit shell.Crude enzyme preparation was made by grinding fruit shells with water or with phosphate-citric acid buffer (pH 6.8) and then filtering.Enzy-...

Litchi is a famous fruit indigenous to southern China.When the fruit is fully ripe it is beautifully bright red,but the color fades rapidly and turns dull brown a few days after being kept at room temperature.In order to find out what is the active agent responsible for the rapid browning of the fruit,a study was made of the oxidizing enzy- mes present in the fruit shell.Crude enzyme preparation was made by grinding fruit shells with water or with phosphate-citric acid buffer (pH 6.8) and then filtering.Enzy- me activity was measured by manometric method with the Warburg apparatus. An enzyme was found which can oxidize catechol and hydroquinone at pH 6.8,but it cannot oxidize mon0phenols such as p-cresol and tyrosine.The enzyme in litchi peri- carp was thus found to resemble laccase with respect to substrate specificity.Enzyme activity was much reduced at pH values below 6.8,being about one-half at pH 6.2 and about one-fourth at pH 5.0 as that at pH 6.8.Boiled fruit shell extract still had some oxidizing activity toward hydroquine,presumably due to the presence of some thermostable factors capable of oxidizing polyphenols in the crude extract. Copper chelating agents such as thiourea and sodium diethyldithiocarbamate (dieca) had peculiar effects on this enzyme.The enzyme from fruit shells of the variety“Bai-la- zi”(白蜡子)was inhibited by thiourea in only a short period.The inhibition gradually diminished and totally disappeared within 20-80 minutes.The degree and duration of inhibition varied with the concentration of thiourea,the higher the concentration,the greater the degree and the shorter the time of inhibition would be.After the inhibition has disappeared,absorption of oxygen continued to increase to an amount higher than that of the control,resulting in a stimulation effect.No inhibition was shown by thio- urea to the enzyme from fruit shells of the variety“Huai-zhi”(淮枝),which was sti- mulated by thiourea at the very beginning of oxidation reactions.Dieca inhibited the enzyme at low concentration (0.2mM).At higher concentrations (2 or 4mM) dieca gave a stimulation effect;the absorption of oxygen was markedly enhanced in the pre- sence of dieca (2 or 4mM) as compared with that of the control.The increase of oxygen uptake in the presence of thiourea or dieca was not due to the direct oxidation of these reagents by the enzyme.Further studies are being carried out to make clear the nature of these effects.

本文报告在荔枝果皮中有多酚氧化酶存在,但荔枝果皮提取液在经煮沸后仍有部分的氧化对苯二酚的活性。在 pH4.0—6.8范围内,酶活性以在 pH6.8中为最强。此酶对邻苯二酚及对苯二酚均起氧化作用,但不能氧化间苯二酚及一元酚(对-甲酚和酪氨酸)。故从基质特异性来看,荔枝果皮的多酚氧化酶与漆酶相类似。抑制剂如硫脲及二乙胺基二硫代甲酸钠对荔枝果皮多酚氧化酶具有特殊的作用。硫脲对白蜡子荔枝果皮多酚氧化酶只呈暂时的抑制作用,以后抑制作用逐渐消失并转为促进作用,抑制时间及促进程度随浓度而异。硫脲对淮枝荔枝果皮多酚氧化酶则不呈抑制而只呈促进作用。低浓度(0.2mu)的二乙胺基二硫代甲酸钠对荔枝果皮多酚氧化酶呈抑制作用,但高浓度(2,4mM)则有强烈的促进作用。

1. The vitamin B_(12) content of the Mollusk (Arca subcrenata) and its extr-action methods have been studied. The results obtained indicate that the vitaminB_(12) content of the fresh meat of Arca subcrenata is 65~85r/100g., of its brothobtained during processing, 0.20~0.30r/ml. and of the extractive of its meat0. 25~0. 40r/ml. 2. The vitamin B_(12) extracted from Arca subcrenata consists of needle-shapercrystals of dark red color. Its three absorption peaks are found at 278.3m~μ,361.0 m~μ, and 550.0 m~μ....

1. The vitamin B_(12) content of the Mollusk (Arca subcrenata) and its extr-action methods have been studied. The results obtained indicate that the vitaminB_(12) content of the fresh meat of Arca subcrenata is 65~85r/100g., of its brothobtained during processing, 0.20~0.30r/ml. and of the extractive of its meat0. 25~0. 40r/ml. 2. The vitamin B_(12) extracted from Arca subcrenata consists of needle-shapercrystals of dark red color. Its three absorption peaks are found at 278.3m~μ,361.0 m~μ, and 550.0 m~μ. The ratios of absorbency are: A361/A278=1.72, A361/A550=3.25 It was confirmed that the characteristics of vitamin B_(12) crystals extractedfrom Arca subcrenata well agree with the descriptions in Chinese PharmaceuticalCode (1963).

1.本文研究了毛蚶维生素B_(12)的含量及其提炼方法。试验证明:鲜毛蚶肉每百克含B_(12)65~85微克,在加工生产中蒸煮的蚶汤合B_(12)0.20~0.30微克/毫升,蚶肉浸出液含B_(12)0.25~0.40微克/毫升。 2. 从毛蚶中提取的B_(12)为暗红色针状结晶,其三个特征吸收峰分别位于278.3毫微米、361.0毫微米和550.0毫微米,峰值光密度之比为: A361/A278=1.72, A361/A550=3.25 表明毛蚶B_(12)结晶特性符合《中华人民共和国药典》的规定(1963年)。

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...

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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