查询词典 acid-base

Then gel filtration, positive ion resin absorption and isoelectric deposition were applied for polysialic acid purification process. The purity of polysialic acid was above 90 % with neutralisation deposition method and the recovery yield of polysiac acid was 55.8%.

探讨了凝胶过滤法、阳离子树脂吸附法、中和沉淀法进一步纯化聚唾液酸的工艺，其中中和沉淀法可使聚唾液酸纯度达到91.5%，回收率为55.8%。

The production process of fatty acid methyl ester with high acid value acidulated oil and fatty acid replaced superior quality fat and oil by high temperature gas phase method and supplemental ester translation process was also introduced.

对间歇式酯化-酯交换工艺进行了具体分析，并着重介绍了采用高温气相法及补充酯交换工艺，以高酸值酸化油和脂肪酸代替高档油脂生产脂肪酸甲酯的生产工艺。

The capsaicin in the sample was alkalized with NaOH solution and mixed with phosphotungstic acid and phospho-molybdic acid , the blue heteropoly acid salt has characteristic absorption at 660 nm.

对以辣椒碱为单剂和复配剂制成生物农药中辣椒碱总量的测定条件研究结果表明，含有辣椒碱的生物农药试料，辣椒碱在碱性溶液中与磷钨酸-磷钼酸作用，生成蓝色的磷钨酸–磷钼酸杂多酸盐，在660nm有最大吸收，其吸光度与溶液中辣椒碱的含量成正比。

At last, fatty acid of leg muscle extracted and basified in the methanol. Analysed dribs and drabs of fatty acid by GC/MS, which proved L-carnitine help the transportation of long-chain fatty acid.

最后，提取小鼠腿部肌肉中的脂肪，甲酯化，用气相色谱-质谱法分析各个脂肪酸片断，验证L-肉碱帮助运输长链脂肪酸进入线粒体氧化的作用。

A preparation method of the visible-light photocatalyst Bi2WO6 nano-powder is characterized by comprising the steps as follows:(1) the selection of raw materials;(2) bismuth nitrate Bi(NO33 question mark 5H2O is added into a citric acid solution to obtain the citric acid solution containing white sediment;(3) EDTA is added into ammonia water which is then added dropwise with the citric acid solution containing the Bi(NO3)3 question mark 5H2O so to obtain a solution of bismuth;(4) the solution of bismuth is added with (NH4)6W7O24 question mark 6H2O solution to form a precursor solution which is then stirred, dried, coked, cooled and ground to obtain decarburized powder;(5) the decarburized powder is roasted for 2h to 4h under 450 DEG C to 550 DEG C to obtain the visible-light photocatalyst Bi2WO6 nano-powder.

可见光催化剂Bi 2 WO 6 纳米粉体的制备方法，其特征在于它包括如下步骤：1原料的选取；2将Bi(NO 3 ) 3 5H 2 O加到柠檬酸溶液中，得到含有白色沉淀的柠檬酸溶液；3将乙二胺四乙酸加到氨水中，并缓慢滴加入含有Bi(NO 3 ) 3 5H 2 O的柠檬酸溶液中，得铋的溶液；4将(NH 4 ) 6 W 7 O 24 6H 2 O溶液加入上述铋的溶液中，组成前驱液；搅拌，干燥，焦化，冷却后，研磨，得去碳的粉体；5将去碳的粉体在450～550℃下焙烧2～4h后，得到可见光催化剂Bi 2 WO 6 纳米粉体。

Through a variety of resin filter, adsorption and elution conditions for the optimization, as well as decolorization, crystallization methods of research, this article eventually determine the strong acid cation resin HZ-001 which is at pH 3, 3BV / h, having the largest adsorption to the tryptophan; the fermentation broth were centrifuged to remove sediment,then treated with activated carbon to be decolored and then treated with strong acid cation resin HZ-001. After that,2mol/l amino acid were passed through the HZ-001 ion exchanging column,kept almost constants when the flow rate stayed 6 BV / h. At 60℃,it was condensed into the saturated state and then added Ethanol until its percentage reaching 30%. At 4 ℃ under 100rpm placed in the shaker 20h, the collection of L-tryptophan was dried up in vacuo.

本文通过对种树脂的筛选、吸附和洗脱条件的优化，以及对脱色、结晶方法的研究与摸索，最终确定强酸型阳离子树脂HZ-001在pH=3，3倍床体积流速，温度室温，对色氨酸有最大的吸附作用；将发酵液离心去沉淀并用活性炭脱色后通过HZ-001强酸型阳离子交换树脂柱，再用2mol/L的氨水6倍床体积流速在室温下进行洗脱，收集洗脱液，60℃浓缩为过饱和状态后加入30%无水乙醇，4℃下100rpm摇起晶20h，过滤搜集结晶并真空干燥得白色粉片状L-色氨酸晶体。

In the second chapter, p-hydrazino-benzenesulfonic acid was prepared by diazotizing sulfanili acid with sodium nitrite. The diazanium salt was then reduced with sodium hydrogen sulfite and acidified with sulfuric acid to give 83.4% product. After several repeated experiments, the reactant and reaction condition are determined.

由于Cy系列试剂的特殊结构使其在荧光标记方面与其他试剂相比有着显著的优点，在生物芯片和蛋白质组学方面得到了广泛的应用，因此文章综述了Cy系列试剂在DNA芯片和蛋白质组学研究中的标记方式以及应用。

Complete genome sequences of 20 viruses in Bunyaviridae loaded from NCBI were analyzed by two biological softwares of DNAMAN and DNASTAR. The results indicated great variability in both nucleic acid sequence and protein structure between plant viruses and animal viruses:(1) only plant viruses could encored NSm in M genome;(2) the length of nucleic acid sequence and protein sequence was different;(3) GC content of nucleic acid of animal viruses was higher than plant viruses of that;(4) protein topology analysis by online software SMART discovered that there was significant difference for the structure of glycoproteins G(subscript nG between animal-infecting and plant-infecting viruses;(5) usually, protein of plant-infecting virus had more complicated structure, more low compositional complexity and had N-Signal peptides except INSV.

本文从NCBI数据库下载具有完整基因组序列的布尼亚科病毒的5个属20种病毒的序列，用生物学软件DNAman，DNAstar进行比对分析，发现布尼亚科病毒属中的植物病毒在核酸序列及蛋白结构上与动物病毒有很大差异：(1)只有植物病毒的M基因组能编码NSm运动蛋白；(2)植物病毒和动物病毒在核酸序列和蛋白质序列长度均有差异，表明该科病毒是进化速度较快的病毒；(3)植物病毒核酸序列的GC含量低于动物病毒；(4)通过SMART网络软件进行蛋白质拓扑结构分析发现植物病毒和动物病毒在糖蛋白GG的结构上存在显著差异；(5)植物病毒糖蛋白结构较为复杂，有较多的紊乱区域，除INSV外，其他病毒都具有N端信号肽。

It is found that compared with the untreated glass fiber reinforced unsaturated polyester, the fluoridized FRP"s property of anti-water and anti infirm-acid has enhanced, while theproperty of anti- strong acid, anti-strong alkali and anti-organic solvent hasn"t changed much.The property of anti-acid and anti-alkali of the glass fiber reinforced epoxy resin fluoridizedby 3-(1H, 1H, 5H-Octafluoropentyloxy)-1, 2-Propenoxide has a corresponding increase, but theproperty of anti-organic solvent hasnt changed much.

研究发现，经G-02、G-04处理后的聚酯玻璃钢的与未处理的聚酯玻璃钢相比，其耐水性增强，耐弱酸性也有所增强，但耐强酸性、耐碱性、耐有机溶剂的腐蚀性变化不大；而经环氧丙基八氟戊醚处理后的环氧玻璃钢其耐酸耐碱性都有相应的增强，但是其耐有机溶剂的腐蚀性无太大变化。

The sample was liquated with a mixed flux of unhydrous sodium carbonat and bonic acid,soaked out with hydrochloric acid(1+5),and then the sample solution was measured by inductively coupled plasma atomic emission in system of nebulizer and torch resistant to hydrofluoric acid.

试料经无水碳酸钠和硼酸的混合熔剂熔融，HCl(1+5)浸取，在电感耦合等离子体原子发射光谱仪上，用耐HF腐蚀的雾化器和矩管系统测量。

Fancy gold-plated dangling earrings with facetted White Opal crystals.

花式镀金悬垂耳环与facetted白欧泊水晶。

This essay chooses the study aim from biology teachers in middle school in Shi Jiazhuang which tells us that most of the middle school biology teachers in Shi Jiazhuang have the"burnout", lower successfulness, individualize.

本文选取石家庄市初中生物教师作为研究对象，运用问卷调查的方法对石家庄市初中生物教师职业倦怠的现状进行调查，调查结果发现，石家庄市初中生物教师这一群体普遍存在职业倦怠，情感枯竭程度偏高，成就感偏低，去个性化程度最为严重。