查询词典 purification

BACKGROUND: Chitosan and its derivant are environmental-friend natural macromolecular materials, characterizing by great flocculation and adsorption capacities caused by electrophilic group including amino and hydroxyl groups, as well as its long-chain molecular structure. So chitosan is widely used as flocculants in domains of sewage disposal, food refining as well as Chinese medicine purification.

背景：壳聚糖及其衍生物是环境友好的天然高分子材料，其分子中丰富的带电基团如氨基、羟基以及长链分子结构赋予其优良的絮凝吸附能力，被作为絮凝剂广泛用于工业用水、食品精制以及中药液纯化等领域。

The solids control equipments are rationally distributed,and up to five stages purification(rough screening,degas,desand,desilt and centrifugation),and optimum the performance of the mud.

固控设备布局合理，达到五级净化标准（粗筛、除气、除砂、除泥、离心），使泥浆性能得到进一步优化

It is concluded that the ultrafiltration preconcentration combining with multieffect evaporation is a promising concentration procedure for straw black liquor, which can not only reduce the concentration costs, but also improve the subsequent evaporation and combustion operation due to the desilicification and purification of ultrafiltration.

两种膜比较，磺化聚砜膜更易清洗，而且水通量大。5）超滤浓缩后，黑液中木素的浓度和纯度大大提高，超滤是从黑液中分离木素的理想方法。6）与多效蒸发相比，用超滤法浓缩麦草黑液可降低能耗70~85%，若用于黑液的预浓缩，再结合多效蒸发，不仅可以降低黑液的浓缩费用，而且由于除硅和纯化作用，会大大改善后继的蒸发和燃烧的操作。

The vacuum carbonate desulphurization process is a kind of new wet absorption technique of gas purification since 1990s.

真空碳酸盐法脱硫工艺，是二十世界90年代发展起来的一种湿式吸收脱硫工艺。

We reconstructed the gene of human scFv and prepared scFv and scFv antibody fragments by prokaryotic expression system PET22b/BL21(DE3). After being purification by Ni-NTA column and renaturalization by urea dialyzation, the affinity and thermostability of scFv and scFv were detected.

结果表明，成功构建了scFv基因；实现了scFv和scFv在原核中的高效表达，二者的表达量均占菌体总量的35％以上，且成功的纯化了表达的重组蛋白，复性后获得了有活性的纯化重组蛋白。

A technological process for the extraction and purification of pinoresinol diglucoside in eucommia ulmoide oliver was studied andHPLC method for determination was used.

摘 要：对杜仲中活性成分松脂醇二葡萄糖甙(Pinoresinol DiGlucoside ，即PDG)提取、纯化工艺进行了研究，并使用高效液相色谱法测定PDG含量。

And to make the product be easy of purification, the excess of amine was reduced to 50% from 150%. Then the diiodoalkane reacted with dialkylmethylamine into diquaternary ammonium iodide, and obtained three diquaternary compounds whose spacer groups were -(CH2)6-, N,N"-dimethyl- N,N,N",N"-tetraoctyl-1,6-hexane diammonium diiodide, N,N"-dimethyl-N,N,N",N"-tetradecyl-1,6-hexane diammonium diiodide, N,N"-dimethyl-N,N,N",N-tetradodecyl -1,6-hexane diammonium diiodide.

对于更长间隔链的双子型季铵盐，一方面为了加快亲核取代反应速率，先将1，6-二氯己烷、3-氧杂-1，5-二氯戊烷转化成1，6-二碘己烷、3-氧杂-1，5-二碘戊烷，另一方面为了降低产物提纯的难度，将叔胺的过量由150%降到50%，使二碘代烷与双长烷基甲基叔胺在相同的温度下、反应相同的时间，经过相同的后处理，得到3个间隔链为-(CH2)6-的双子型季铵碘化物，(C8H17)2N+(CH3)(CH2)6 (CH3)N+(C8H17)2·2I-、(C10H21)2N+(CH3)(CH2)6(CH3)N+(C10H21)2·2I-和(C12H25)2N+(CH3)(CH2)6(CH3)N+(C12H25)2·2I-。

Results The D101 macroporous resin was shown to be the best resin for the separation and purification of the total saponin from the ＂Wu-He＂ dipsacus root.

D101型大孔树脂在所确定的工艺条件下能较好地分离纯化五鹤续断总皂苷，其固形物中总皂苷的含量＞50%，总皂苷的回收率＞91%。

Wu-He＂ dipsacus root; Saponin; Resin, synthetic ; Separation and purification

五鹤续断皂苷类树脂类，合成分离和提纯

Suggestions such as: to strengthen the investigation of pollution of water quality in various areas,to research new problems of pollution such as endocrine disruptor pollution,to strengthen the integrated study of water purification technology,are proposed.

因此 ，我们必须进一步了解饮用水中各种污染物的来源和特性。1 1 无机化合物污染无机化合物污染主要由微量的有毒有害金属与矿物质组成，无机化合物存在于水中主要是工业和农业活动造成的结果

It has been put forward that there exists single Ball point and double Ball points on the symmetrical connecting-rod curves of equilateral mechanisms.

从鲍尔点的形成原理出发，分析对称连杆曲线上鲍尔点的产生条件，提出等边机构的对称连杆曲线上有单鲍尔点和双鲍尔点。

The factory affiliated to the Group primarily manufactures multiple-purpose pincers, baking kits, knives, scissors, kitchenware, gardening tools and beauty care kits as well as other hardware tools, the annual production value of which reaches US$ 30 million dollars.

集团所属工厂主要生产多用钳、烤具、刀具、剪刀、厨具、花园工具、美容套等五金产品，年生产总值3000万美元，产品价廉物美、选料上乘、质量保证，深受国内外客户的青睐