查询词典 optimum solution

Methods The article applied the orthogonal design to find out the optimum proportion of the rutin, soybean isoflavone and curcumin. The free radical DPPH scaving ratio was used as evaluating standard of orthogonol design and the hominal liver cancer cell SMMU-7721 was used in MTT trial to evaluate the inhibitory ability of the compound. Results The optimum proportion of rutin-soybean isoflavone-curcumin 2:3:7 was achieved.

选取3种天然植物抗氧化物质芦丁、大豆异黄酮、姜黄素，利用正交试验设计选择合适配方，以自由基DPPH的清除率作为正交试验评价标准，并利用人肝肿瘤细胞SMMU-7721进行四甲基偶氮唑盐试验来考察配方体外试验对肿瘤细胞的抑制作用。

Based on equipotential models of some scholars, according to a practicable fact which large substation grounding grids are not equipotential any longer, in inequipotential model, the paper analyzes the influence of the soil resistivity and the grounding grid area on the optimum arrangement in the uniform soil; the paper analyzes the reflective coefficient of double-layer soil, the top-layer soil thickness and the grounding grid area on the optimum arrangement.

为了使地表面的电位均匀分布，进一步降低接触电压和跨步电压，更好地保障人身和设备的安全，本文提出了接地网的优化设计方法。

The optimum conditions of lipase pretreatment and the optimum ratio of lipase and laccase were investigated in this paper.

摘 要：利用脂肪酶具有降解脂肪和蜡的特性，将漆酶与脂肪酶混合处理麦草，以提高蒸煮药液的渗透性，改善蒸煮性能。

The molecular weight of dextransucrase measured by SDS-PAGE was 170 kDa ,which was similar to the enzyme from Leuconostoc mesenteroides. The enzyme had an optimum temperature between 25and 30℃ and an optimum pH of 5.4. It was relatively stable in the range of pH 5.0 to 7.0, but the stability declined rapidly as soon as the temperature rose over 35℃.

以蔗糖为底物，酶促反应的最适温度为25～30℃，最适pH值为5.4，动力学常数Km值为10.43 mmol/L；酶活在pH 5.0～8.0较为稳定，在室温（25℃）保藏4 天仍有59%的酶活力，4℃保存7周酶活力仅下降一半，但在35℃以上失活很快；Ca2+对催化作用有较大的促进，Mg2+有微弱的促进作用，K+对催化反应无影响，Cu2+的抑制作用最强。

The results showed that expression plasmid pET22b-lysB was constructed successfully. Highly purified recombination protein was obtained 33.2 mg from 1 L LB culture medium. A screening for His-LysB activity on esterase and lipase substrates confirmed the lipolytic activity. With p-nitrophenyl butyrate as substrate, the thermal stability of the enzyme was poor when the temperature was above 30oC. The enzyme exhibited higher stability at pH 5.0–9.5. The optimum temperature and pH for the lipolytic activity of His-LysB were 23oC and 7.5 respectively. Under the optimum conditions, the specific activity of His-LysB was 1.3 U/mg. Zn2+, Cu2+, Mg2+, Mn2+and phenylmethane sulfonyl fruoride severely inhibited the lipolytic activity of His-LysB.

结果表明：成功构建了pET22b-lysB表达载体，并从1 L的LB培养物中获得了33.2 mg高纯度重组蛋白；His-LysB具有分解脂肪的能力，属于脂肪酶；生物化学特性分析表明：丁酸对硝基苯为水解底物，His-Lys热稳定性不佳，30℃以下比较稳定，随着温度的升高，稳定性逐渐降低；该蛋白具有较高的pH值适应性，pH 5.0~9.5范围内稳定性较高；在23℃和pH 7.5时酶活力最高，其比酶活为1.3 U/mg；金属离子Zn2+、Cu2+、Mg2+、Mn2+和苯甲基磺酰氟抑制剂对酶活具有强烈的抑制作用。

The results show that the optimum conditions are: the mole ratio of malonic acid to benzaldehyde 1.0:0.9, the dosage of proline 4.0% of the weight of malonic acid and the reaction time 4h, the yield of cinuamic acid is 99.0% under the optimum conditions.

实验结果表明，合成肉桂酸的最合适条件：原料比为1.0：0.9，L-脯氨酸用量为丙二酸质量的4.0%，反应时间4h，在此最佳条件下，肉桂酸的收率达到99.0%。

When the concentration of L-phenylalanine was 6 g/L,the optimum values of volume ratio of organic phase to aqueous phase,reaction temperature,pH value and liquid volume were 1∶1,30 ℃,4.0 and 20 mL/250 mL respectively. Under above optimum conditions,the content of 2-phenylethylalcohol reached 3.0 g/L 48 h later,which increased by about 50% than that in monophasic aqueous system.

当初始底物浓度为6 g/L、水和油酸的相体积比为1∶1、反应温度30 ℃和pH值4.0、装液量20 mL/250 mL 的条件下，转化48 h，产物浓度达到3.0 g/L，比单水相提高了50%。

To dissect single cells promising to culture from tissues, we researched the time of hydrolyzation of the tissues by tryposin, the result showed that the optimum time of hydrolyzation of the tissues was 5~10min when pretreated with 0.25% tryposin under the optimum conditions of pH8.0 at 37 C.We cultured four tissues: embryo at mediat-anaphase, head of high-age nymphae, spermary and ovary of adult.

组织块分离出来后，为了能获得单个的、有培养前景的细胞，本实验又研究了低浓度的胰蛋白酶在其最适温度和最适pH条件下，获得分离程度适宜的组织块的不同酶解时间，结果0.25％的胰蛋白酶在37℃、pH8.0的条件下酶解组织块的最适时间是5～10min。

The result indicated that: the amount of the excess HF formed direct ratio to the yield of phosphorus pentafluoride and the optimum amount of the excess HF used is about 35%; the trickling rate of oleum shouldnt make the temperature of hexafluorophosphoric acid exceed 25 ℃ and the amount of oleum is 110% to 125% that of stoichiometry so that the content of phosphorus pentafluoride can be achieved 90%; the time and temperature of heating hexafluorophosphoric acid influenced both the yield and the content of phosphorus pentafluoride, and the optimum time should be about 30 minutes and the proper temperature was 148 to 153℃; when alcohol used asrefrigerant, the content of phosphorus pentafluoride was 94.03%, and the content can be up to 97.38%, provided that using liquid nitrogen as refrigerant.

通过实验发现，氟化氢用量与五氟化磷的产率成正比，最佳过量百分率宜在35％左右；发烟硫酸的滴加速度不能使中间产物温度大于25℃，发烟硫酸用量大于理论量10％～25％时，得到的五氟化磷纯度高于90％；六氟磷酸的加热温度对五氟化磷的产率和纯度均有影响，宜在148～153℃的范围内，加热时间应在30分钟左右；用工业酒精做冷凝介质得到的五氟化磷纯度最高只能到达94.03％，使用液氮做冷凝介质可以使五氟化磷的纯度达97.38％以上。

The toxicity of soil artificially contaminated by heavy metals was assessed with Photobacterium phosphoreum.The results showed that the duration of optimum balance was 24 hours, and that of optimum extraction was 2 hours.

应用明亮发光杆菌T3对重金属污染土壤的毒性进行诊断，确定了实验室中采用人为定量投加污染物的情况下，土壤的最佳平衡时间为 2 4h ，最佳浸提时间为 2h ，最佳浸提剂为 0 。1mol·L-1Hcl。

Continuously improve the production mechanism, to provide customers with better quality products and services.

不断的完善生产机制，给客户提供更优质的产品及服务。

B:Yes, he was the very prize-winner in the court tennis ten years ago?

是的，他是十年前的世界网球冠军。