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缓冲ph
相关语句
  buffering ph
     In the ex periment, all kinds of neutralizers were titrated by standard acid solution to g et different buffering pH. According to the results, we can select different neut ralizers as varied demands.
     用已知浓度的酸滴定各种中和剂,可以初步得到各中和剂的缓冲pH,根据此结果,可以应用于不同要求的革产品鞣制工序中。
短句来源
  “缓冲ph”译为未确定词的双语例句
     A little dissolution of MgCO 3 makes it possible that the solution has buffer pH (pH=8.4)which accord with the condition of neutralization sedimentation of chromium ion.
     MgCO3 在溶液中的少量溶解导致体系具备pH缓冲性质 ,且该缓冲 pH值 (pH =8.4)能够满足中和沉淀Cr3 + 的条件 ;
短句来源
     The effects of active carbon treatment were better than that of charcoal treatment and VT-500 treatment produced no good results for algal inactivation.
     而施用一定剂量的水体净化剂VT-500,虽能在一定程度上缓冲pH值下降,但同时会促进藻类生长。
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  相似匹配句对
     Ph.
     Ph.
短句来源
     , Ph.
     ,Ph.
短句来源
     A STUDY ON THE PH VALUE AND BUFFER CAPACITY OF BAMBOO MATERIAL
     竹材的pH值和缓冲容量
短句来源
     Study on Buffer Test of pH
     pH缓冲试验研究
短句来源
     BUFFER CAPACITY
     缓冲容量
短句来源
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  buffering ph
At pH values higher than ;7.5, cell surfaces become increasingly negatively charged strongly buffering pH up to the maximum titration pH ;10.0.
      
BSR is therefore very important as a process for elevating and buffering pH in this system.
      


The relative mobilities of two proteins bands isolated from TCSP by electrophoresis on 7.5 % polyacrylamide gel (PAGE) containing SDS (SDS-7.5% PAGE) changed with the conditions of extraction. When TCSP was resolved by SDS 10-12.5% PAGE or by SDS-7.5% PAGE after treatment with phenolacetic acid-water (2:1:1 by volume; PAW) four bands were found.The freeze-dried TCSP was very easily resolubilized by SDS, but only with difficulty when defated by chloroform-methanol (2:1, by volume; CM)or dehydrated by acetone....

The relative mobilities of two proteins bands isolated from TCSP by electrophoresis on 7.5 % polyacrylamide gel (PAGE) containing SDS (SDS-7.5% PAGE) changed with the conditions of extraction. When TCSP was resolved by SDS 10-12.5% PAGE or by SDS-7.5% PAGE after treatment with phenolacetic acid-water (2:1:1 by volume; PAW) four bands were found.The freeze-dried TCSP was very easily resolubilized by SDS, but only with difficulty when defated by chloroform-methanol (2:1, by volume; CM)or dehydrated by acetone. In the latter case only one band could be found by SDS-7.5% PAGE. After treatment with PAW, the defated and dehydrated TCSP was resolved into three bands by SDS-7.5 % PAGE.By sequential fractionation of TCSP with CM, 10 mM Tris-HCl-buffered 0.15 M NaCl solution (pH 7.5; TS), and 0.1 N NaOH solution (AS), it was found that TCSP was a complex composed of approximately 10 % CM soluble protein (CMP), 30 % TS soluble protein (TSP), 60 % AS solubel protein (ASP), and some alkaline insoluble substances.The CM-extracted fraction contained about 70% protein and 30% neutral sugar, but did not contain any phospholipid and esterified fatty acids. It showed an ultraviolet absorption peak near 260 nm with a shoulder at 320 nm. Four components could be detected by chromatography on Sephadex LH-20 column. Based on the shape of the absorption peaks, these components could be divided into two groups.Enzyme activities of peroxidases, esterases, phosphatases, and ATPase were detected in TSP.A yellowish semi-opaque precipitate was obtained when 10% acetic acid in absolute ethyl alcohol (1:4, by volume) was added to AS extracts. When the precipitate was dissolved in AS and dialyzed against deionized water for 36 hr, then freeze-dried, a silk-like glittering flocculent substance was obtained. The substance was water-soluble and viscous. On Sepharose-4 B chromatogarphy, two peaks were shown in the eluate. Two bands (TCSP-Ⅰ and TCSP-Ⅱ) were separated by SDS-7.5 % PAGE. While with SDS-10 % PAGE, TCSP-Ⅱ appeared prodominantly and its molecular weight was approximately 1.5×10~5.When examined under microscope, yellow globular granules arranged closely on the surface of TCSP were observed when TCSP was suspended in water. These granules could be removed by CM extraction, and then the surface became more smooth. Upon TS extraction, the surface appeared striped with silklike structure. When it was further extracted by AS, some fibrous residues remained.

用有机溶剂CM、Tris-HCl缓冲(pH7.5)的生理盐水(TS)和稀碱(AS)溶液分类分离烟草细胞表面蛋白,发现含有10%左右的CM蛋白,30%左右的TS蛋白,60%左右的AS蛋白和一些未经鉴定的碱不溶性物质(AIS)。 CM蛋白的紫外吸收光谱分析,在波长260 nm附近有一吸收峰,波长320 nm处有一个肩,Sephadex LH-20亲脂性柱层析可分离出四个组分,按其光谱特性可分成两大类。TS蛋白主要是一些水解酶,已测出的有过氧化物酶,酯酶、磷酸酶和腺甙三磷酸酶。AS蛋白在Sepharose 4B柱上可分离出两个洗脱峰,SDS-10%聚丙烯酰胺凝胶电泳分离结果表明,主带分子量接近1.5×10~5道尔顿。 显微镜下观察TCSP及其用CM、TS和AS相继提取后的残存物形态,看到悬浮在无离子水中的TCSP表面密布黄色球形颗粒。CM提取后颗粒消失,出现比较平滑的表面。TS提取后残存物表面出现纹理结构和丝状物。AS提取后剩下的是一束束解开的纤维状物质。

Three strains of bacteria using nitriles as carbon and/or nitrogen sources for growth were isolated from the soils polluted by nitriles, and identified as Corynebacterium hoffmanii B-21, Arthrobacter flavescens B-22 and Klebsiella sp. P-21. The optimum culture conditions of the bacteria were studied. Acetonitrile, propionitrile,butyronitrile and acrylonitrile were degraded by those bacteria to yield corresponding amides,carboxylic acids and ammonia. At the optimum conditions the nitriledegrading capacities of...

Three strains of bacteria using nitriles as carbon and/or nitrogen sources for growth were isolated from the soils polluted by nitriles, and identified as Corynebacterium hoffmanii B-21, Arthrobacter flavescens B-22 and Klebsiella sp. P-21. The optimum culture conditions of the bacteria were studied. Acetonitrile, propionitrile,butyronitrile and acrylonitrile were degraded by those bacteria to yield corresponding amides,carboxylic acids and ammonia. At the optimum conditions the nitriledegrading capacities of the three strains were investigated. The removal rates for those nitriles were nearly 100% after the strains growing on the medium containing 10g/L of aceto-, propio- or butyronitrile at 28℃ for 24 h. When the reaction mixture consisted of 5 g/L of the above nitriles or acrylonitrile and 20 g (dry cell)/L resting cells of the three bacteria were incubated separately in 0.06 mol/L phosphate buffer (pH7.5)at 25℃ with moderate shaking for 45 min,the nitriles could be degraded completely. The degrading products of butyronitrile during the growth of Corynebacterium hoffmanii B-21 were analysed with HPLC.

从长期被腈化物污染的土壤中,筛选到3株对腈化物降解能力很强的细菌,分别为霍夫曼棒杆菌(CorynebacteriumhoffmaniiB-21)、微黄色节杆菌(ArthrobacterflavescensB-22)和克雷伯氏杆菌(Klebsiellasp.P-21)。该菌可将乙腈(Acetonitrile)、丙腈(Propionitrile)、丁腈(Butyronitrile)和丙烯腈(Acrylonitrile)等脂肪族腈降解生成相应的酰胺(Amides)、羧酸(Carboxylicacid)和氨(Ammonia)。在选定的最适条件下,测定了三株菌对腈化物的降解能力。在含10g/L乙腈、丙腈或丁腈的培养基中,于28℃生长24h,腈化物的去除率均接近100%,应用其休眠细胞(20gdrycell/L)于0.06mol/L磷酸盐缓冲(pH7.5)中反应,在25℃、45min内可将5g/L的上述腈及丙烯腈完全降解。

The pH scope for neutralization sedimentation of chromium ion is comparatively narrow (6.3~9.5) and the dosage must be controlled strictly when NaOH or CaO was used. A little dissolution of MgCO 3 makes it possible that the solution has buffer pH (pH=8.4)which accord with the condition of neutralization sedimentation of chromium ion. It is easier to form hydroxide sediment for Cr 3+ in interface area than in solution because the interfacial solubility product of Cr(OH) 3 formed on the surface of MgCO...

The pH scope for neutralization sedimentation of chromium ion is comparatively narrow (6.3~9.5) and the dosage must be controlled strictly when NaOH or CaO was used. A little dissolution of MgCO 3 makes it possible that the solution has buffer pH (pH=8.4)which accord with the condition of neutralization sedimentation of chromium ion. It is easier to form hydroxide sediment for Cr 3+ in interface area than in solution because the interfacial solubility product of Cr(OH) 3 formed on the surface of MgCO 3 is less than the solubility product in solution ( K S SP =10 -33.50 and K SP =10 -30.27 ). After surface sediment is formed, the dynamic electricity behavior of MgCO 3 is similar to Cr(OH) 3. Using magnesite as purifier, the waste water with high concentration of chromium ion is purified, and some advantages, such as good purifying effect, fast subside speed and little sediment volume are manifested. [

中和沉淀Cr3 + 的 pH范围较窄 (6 .3~ 9.5 )决定了采用NaOH或CaO时投药量必须严格控制 .MgCO3 在溶液中的少量溶解导致体系具备pH缓冲性质 ,且该缓冲 pH值 (pH =8.4)能够满足中和沉淀Cr3 + 的条件 ;Cr3 + 在MgCO3 表面生成Cr(OH) 3 沉淀的界面溶度积 (KSSP=10 -3 3 .50 )小于在溶液中的溶度积 (KSP=10 -3 0 .2 7) ,Cr3 + 在界面区域比在溶液中更易形成氢氧化物沉淀 ;表面沉淀生成之后 ,MgCO3 表现出类似Cr(OH) 3 的动电行为 .采用含MgCO3 矿物菱镁石为净化剂 ,在较低用量下能够净化极高浓度含铬废水 ,不仅净化效果好而且具有沉降速度快、污泥体积小等优点 .

 
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