查询词典 precipitation

Then SAM precipitation was carried out by picric acid and SAM precipitated is higher than 90％. After butanone extraction, acetone precipitation and SAM sulfate or SAM double salt of sulfate and p-tosylate formation, the stable SAM salt was obtained.

结果表明，苦味酸是一种选择性较好的沉淀剂，沉淀步骤得率在90％以上，制备SAM的硫酸盐的总得率在60％以上，而硫酸对甲苯磺酸双盐的得率在50％以上，产物的纯度达到了95％以上，已经达到了国外同类产品的质量指标。

The precipitation efficacity showed multi-index curve relationship with the soil water content and precipitation in the base period and the evaporation efficacity showed index curve relationship with the soil water content in the base period.

降水效力与基期土壤含水量、降水量呈多元指数曲线关系，蒸发效力与基期土壤含水量呈指数曲线关系。

The main products are developed from the single HL series HVDC Current Source Power Supply used in electrostatic deposition to the whole set of electrostatic dust precipitation (electrical demisting, electrical tar precipitation) high and low voltage electrical control system, and the manufacture and debugging of the related process-control system. We engage in making overall solutions to the electrical control system accordingly for our customer.

主要产品从单一的静电沉积用 HL 型系列恒流高压直流电源发展到成套的静电除尘高低压电控系统以及相关工艺控制系统的制造和调试，我公司致力于全方面为客户量身定制有关电控系统的解决方案。

Results : The purity of the antibody was estimated to be greater than 90% after euglobulin precipitation combined with gel filtration, but less than 60% after ammonium sulfate precipitation combined with gel filtration.

腹水含有大量的杂蛋白，采用一步纯化法，不可能得到高纯度的IgM抗体，而多步骤纯化因耗时长，抗体活性损失大。

Methods:Ascites fluid was subjected to ammonium sulfate precipitation or euglobulin precipitation.

分别以硫酸铵沉淀或优球蛋白沉淀结合凝胶过滤法，从腹水中纯化IgM型单克隆抗体。

The ratio of EP amount to total precipitation amount is generally increasing in most areas of China,suggesting that the precipitation event has an obvious trend of extremeness.

极端降水量与降水总量的比值表现为全国普遍增加的趋势，说明我国四季降水量均有向极端化方向发展的趋势。

Summer precipitation is intensive and accounts for 67% of total annual precipitation, which can ensure the needs of field crop water in most years.

另外，这一地区年降水量呈现周期性变化，并表现出逐年减少的趋势，这可能使当地的干旱灾害更频发。

The optimum conditions of leaching, sulfide precipitation and fluorination precipitation were determined.

确定浸出工艺条件、硫化沉淀和氟化沉淀工艺条件。

In this paper we combined three chromatographic separation and purification technique such as affinity chromatography, ion exchanger chromatography and hydrophobic interaction chromatography to develope a new technology of stimutaneous extraction of three enzyme from pancreatin. We optimized the technology by studying the methods of purification and assured the technology as: The crude extraction from the dissolution of Pancreatin is directly absorbed on the DEAE gelose fast flow columnEquilibrating buffer is 0.01mol/L NaoAc-HoAc buffer(pH4.5; eluting buffer is 0.2～0.35mol/LNaCl in 0.01mol/LNaoAc-HoAc buffer (pH4.5), and then be eluted by two steps to acquire the peak of kallikrein.The solution which can"t be adsorbed by DEAE gelose fast flow column is adsorbed on affinity chromatographic column Equilibrating buffer is 0.01mol/LTris-HCl buffer(pH7.5, eluting buffer is 0.5mol/LNaCl in 0.01mol/Ltris-HCl buffer(pH7.5)and then be eluted by one step to acquire the peak of trypsin.The solution which can"t be adsorbed by is pretreated with 30%～80%(NH_4)_2SO_4 fractional precipitation, the deposition of the precipitation is dissolved to beabsorbed on phenyl gelose fast flow columnhydrophobic interaction chromatography condition is Equilibrating buffer is lmol/L(NH_4_2SO_4 in 0.01mol/LNaoAc-HoAc buffer(pH4.5), eluting buffer is 0～0.6mol/L(NH_4)_2SO_4 in 0.01mol/LNaoAc-HoAc buffer (pH4.5) and then be eluted by two steps to acquire the peak of chymotrypsin.

本研究考察了各种纯化方法，将离子交换层析、亲和层析和疏水层析三种分离纯化法相结合，建立了激肽释放酶、胰蛋白酶和糜蛋白酶三酶的联产工艺：胰酶用pH4.5醋酸缓冲溶液提取后，粗提液直接上DEAE-琼脂糖快胶柱吸附平衡缓冲液：0.01mol／LNaoAc-HoAc缓冲液(pH4.5，洗脱缓冲液：0.01mol／LNaoAc-HoAc缓冲液(pH4.5)含0.2～0.35mol／LNaCl分两步洗脱，收集激肽释放酶的洗脱峰；DEAE-琼脂糖快胶的未吸附液上亲和层析柱分批吸附平衡缓冲液：0.01mol／LTris-HCl缓冲液(pH7.5，洗脱液：0.5mol／LNaCl溶液，一次洗脱，收集胰蛋白酶洗脱峰；最后，亲和层析未吸附液用30％～80％硫酸铵分级盐析处理，沉淀溶解后用上苯基—琼脂糖快胶吸附平衡缓冲液：0.01mol／LNaAc-HAc缓冲液(pH4.5含1mol／L(NH_4)_2SO_4，洗脱缓冲液：0.01mol／LNaAc-HAc缓冲液(pH4.5)含0～0.6mol／L(NH_4)_2SO_4，分两步洗脱，收集糜蛋白酶的洗脱峰。

The change rules of precipitation ratio, microstructure and particle size and the effect of oleic acid on the seed precipitation of sodium aluminate solution were investigated. According to these experimental results, the total energy and electronic structure of oleic acid locating on gibbsite (001) and face (100) with different modes were calculated, and the equilibrium and growth morphology of the systems were analyzed.

研究添加油酸杂质时，铝酸钠溶液分解过程中分解率、氢氧化铝产品的形貌和粒度的分布变化规律；计算以各种不同方式位于氢氧化铝的(001)和(100)面时油酸分子的总能量和电子结构，并分析各体系的平衡形态及生长习性。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。