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Acetylsalicylic acid was synthesized from salicylic acid and acetic anhydride catalyzed by strong-acid cation exchange resin.

以水杨酸和乙酸酐为原料、强酸阳离子交换树脂为催化剂合成阿司匹林。

The methods determing the groups in the modified starch have been developed, that is acidimetry for the basicity of acidified starch, complexing titration for the substitution degree of carboxymethyl starch, and heat paste titration and carbonyl process respectively for the carboxyl and nitrogen of oxidized starch.

建立了以酸碱滴定测定酸化淀粉的碱量、络合滴定法测定羧甲基淀粉的取代度、热糊滴定和羟胺法测定氧化淀粉中羧基及羰基、消化定氮测定阳离子淀粉等几种变性淀粉的基团分析方法。

Bovine antimicrobial peptides Bac7 and Bac5 are linear cation micromolecular polypeptides, which play an important role in both innate and acquired immunity.

牛抗菌肽Bac7和Bac5是一种线性阳离子小分子多肽,在机体天然免疫和获得性免疫中都发挥着重要作用。

Electron transfer reaction between the radical cations of purine nucleotides and some aromatic amino acids was studied by use of pulse radiolytic techniques. Time-resolved spectroscopic evidence revealed that the one-electron-oxidized radicals of dAMP and dGMP can be efficiently repaired by tyrosine and tryptophan.

鉴于在DNA光敏损伤过程中主要生成嘌呤碱基阳离子自由基,利用脉冲辐解技术研究了嘌呤碱基阳离子自由基与部分芳香氨基酸的相互作用,获得了酪氨酸和色氨酸对单电子氧化的dAMP和dGMP经快速电子转移修复的瞬态吸收光谱证据。

To study the effects of pyrolytic temperature on the cation exchange capacity of the crop-residue-derived black carbon and the Pb2+ and Cd2+ sorption on BC,the BC was isolated from the charred wheat residues by pyrolyzing the wheat residues under the oxygen-limited conditions for 24 h at 150,250,300,400 and 500 ℃ respectively.

为探讨热解温度对秸杆燃烧物提取黑碳阳离子交换量和重金属吸附量的影响,在150~500℃范围24h热解小麦秸秆,提取黑碳,测定黑碳阳离子交换量和黑碳吸附铅(Pb2+)和镉(Cd2+)量。

It should be noted that not only in the complex perovskite like BaO3,(X=Mg, Zn, Co, Ni, Mn: Y=Nb, Ta) but also in the compounds with tungsten bronze structure such as Ba6-3xLn8+2XTi18O54, they are consisted of corner-sharing oxygen octahedra and the ratios of ion in B site to ion in A site are usually larger than one.

值得注意的是业已开发出来的材料不论是复合钙钛矿BaO_3,(X=Mg,Zn,Co,Ni,Mn;Y=Nb,Ta)还是钨青铜结构,它们都是由氧八面体共顶连接,而且氧八面体内、外阳离子比例都等于或略大于1,因此,我们推测在B位与A位阳离子比例略小于1的类钙钛矿结构中极有可能存在具有优良介电性能的新材料。

Based on these results, it is reasonable to assume that cationic surfactant could form well-stabilized films on the surface of partially hydrated polyacrylamide solution, as a result a kind of surface active complex was formed between cationic surfactant and HPAM.

总之,本论文系统研究了阳离子表面活性剂和不同水解度的聚丙烯酰胺之间的相互作用,发现阳离子表面活性剂能在HPAM水溶液表面成膜,这和表面活性剂的HLB值有关,还与HPAM的水解度以及溶液的pH值有关;两者之间的静电引力是主要驱动力,这一过程又被表面活性剂链之间的疏水相互作用所增强。

The effect of three common hydro-chemical factors,such as univalent cation concentration(Na+ ion concentration),bivalent cation concentration(Ca2+ ion concentration) and pH value on clay particles releasing in sand column was studied through batch test.

通过批量试验,对一价阳离子浓度,二价阳离子等,浓度(Ca2+浓度)和pH值三个最常见水化学因素对砂柱中粘土颗粒释放的影响进行了研究。

The transient transfection efficiency was measured by flow cytometry. The stable transfected cells were screened by G418. Results Electrotransfection had the highest transient transfection efficiency (56.8%), with the most masc clones of stably transfection and the least time taken to form big masc clones (20 days). Cationic polymer mediated transient transfection had the lowest efficiency (1.7%), with the least masc clones and the longest time taken to form the big masc clones (30 days). Cationic liposome transfection had a transient transfection efficiency of 39.9% and took 25 days to form the big masc clones.

结果 电转染有最高的瞬时转染效率(56.8%),稳定转染得到的阳性克隆最多,且从细胞筛选到扩增至得到阳性大克隆所用的时间也最少(约20d);用阳离子聚合物瞬时转染率低(1.7%),稳定筛选同样可以得到阳性大克隆,但是数量很少且从细胞筛选到扩增至阳性大克隆所用的时间也最多(约30d);阳离子脂质体转染效果居中,瞬时转染率为39.9%,从细胞筛选到扩增至得到阳性大克隆所用的时间约25d。

A new type of dimorphic denature starch cationic starch with lauril glucoside was synthesized by reaction of cationic starch with lauryl alcohol at the presence of emulsifier and catalyst.

在乳化剂和催化剂作用下,以阳离子淀粉和月桂醇为主要原料,合成了一种新型高取代度的双变性淀粉——阳离子淀粉月桂基糖苷。

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On the other hand, the more important thing is because the urban housing is a kind of heterogeneity products.

另一方面,更重要的是由于城市住房是一种异质性产品。

Climate histogram is the fall that collects place measure calm value, cent serves as cross axle for a few equal interval, the area that the frequency that the value appears according to place is accumulated and becomes will be determined inside each interval, discharge the graph that rise with post, also be called histogram.

气候直方图是将所收集的降水量测定值,分为几个相等的区间作为横轴,并将各区间内所测定值依所出现的次数累积而成的面积,用柱子排起来的图形,也叫做柱状图。

You rap, you know we are not so good at rapping, huh?

你唱吧,你也知道我们并不那么擅长说唱,对吧?