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Hexamethylene diamine, hexane diaminesalt or ester of nitrous acid.

天门冬胺酸,天门冬胺酸酯一种天门冬胺酸或脂

Both three-dimensional chiral compounds have intriguing chiral channels, which are built up of homochiral intertwined double helices. The circular dichroism spectra of 1 and 2 in water have shown they are stable in solution, which document they will be significantly useful in asymmetric catalysis and chiral medicine.

以Keggin结构多金属氧酸为建筑单元,通过手性的铜-脯氨酸配合物作为模板剂构筑了2个基于Keggin结构多金属氧酸的3D纯手性化合物,化合物1和2是一对对映体,代表了世界上第一例3D手性多酸化合物,具有由同手性螺旋缠绕形成的手性孔道,水溶液中的圆二色谱表征这个3D手性化合物可稳定存在,显示这个物种可以在不对称催化及手性药物方面有潜在的巨大的应用价值。

The method comprises following steps: reacting hydroxylation carbon nano-tube successively with reagent containing halogen and hydrosulphide to prepare sulfhydryl carbon nano-tube; reflowing the sulfhydryl carbon nano-tube and platinum salts in polyatomic alcohol, processing in hydrogen atmpsphere to obtain sulfhydryl anchoring platinum / carbon nano-tube catalyst; reflowing the sulfhydryl carbon nano-tube successively with the hydrochloroauric acid and the platinum salts in polyatomic alcohol, processing in hydrogen atmpsphere to obtain sulfhydryl anchoring platinum-gold / carbon nano-tube catalyst.

本发明将市售羟基化碳纳米管先后与含卤试剂和氢硫化物反应得到巯基化碳纳米管。再将巯基化碳纳米管与铂在多元醇中回流,氢气氛中处理得到巯基锚固铂/碳纳米管催化剂。将巯基化碳纳米管依次与氯金酸和铂在多元醇中回流,氢气氛中处理得到巯基锚固铂-金/碳纳米管催化剂。

Phosphonic acids, hydroximic acids, arsenic acids and cationic not only have a strong collecting ability, but also have a strong collecting selectivity which is better than that of fatty acids.

认为脂肪酸类捕收剂的捕收能力较强而选择性较差,与钽铌矿物作用时生成了铁和锰的油酸,而不是钽铌的油酸

This effect was observed clearly at final concentration between 1 and 10μ mol/L after treating for 24 hours. We concluded that the possible mechanisms of hydroquinone bleaching hyperpigmented skin were through its inhibition of tyrosinase activity at lower concentration and its cytotoxicity at higher one.

提示18α-甘草酸双胺、熊果苷的皮肤脱色作用机制与氢醌可能不同,后者低浓度时以抑制酪酸酶活性为主,高浓度时主要是细胞毒,且细胞早期的损伤部位可能发生在树状突。18α-甘草酸双胺能否成为一种无细胞毒酪氨酸酶抑制型皮肤脱色剂有待进一步临床加以验证。

A salt or ester of hypochlorous acid.

浸渍铁的;含铁

From 1999 to 2000, vegetation types selected by the water deer included Imperata cylindrical, Phragmites autralis, Aleuropus littoralis, Suaeda glaura, and Suaeda salsa. In our study, the deer only preferred Suaeda salsa.

1999-2000年期间獐选择的植被类型比较多样化,包括白茅草滩、芦苇地、獐毛草滩、碱蓬地和地碱蓬草甸等。2006年冬季,獐只倾向于选择地碱蓬草甸。

In most cases, scale is mainly composed of infusible material with abnormal solubility.

水垢一般是由具有反常溶解度的难溶或微溶组成。

The performace of material was tested by DSC,XRD,SEM,EIS and charge-discharge cycles . The influences of various synthesized condition , sintering time and the amount of F were studied and correlative technics parameter to improve performance of material were optimized. DSC shows that three endotherimc peaks and one large exothermic peak are observed in the temperature range 150-400℃, which is because of the removal of water,the decomposition of the organic constituents and the formation of spinel. Only the citrate precursor is sintered at least 450℃, the crystallinity of spinel phase could be formed intactly.

通过DSC、XRD、SEM、EIS和充放电循环等手段对材料进行性能测试,比较了不同合成温度、烧结时间和不同掺杂元素量等条件对材料性能的影响,优选出提高材料性能的相关工艺参数, DSC表明,采用溶胶-凝胶-络合法制备的前驱体在150-400℃中有三个小的吸热峰和一个大的放热峰,这是前驱体中的水分、柠酸酸及其和醋酸及其在蒸发及分解,柠檬酸前驱体至少需在450℃以上才可能形成完整的尖晶石材料。

An unreported compound 2-cyclopropylbenzimidazolium salt was obtained from 2-cyclopropyl benzimidazole and iodomethane.

以邻苯二胺和环丙基甲酸为原料,以多聚磷酸为催化剂,在微波辐射下合成了环丙基苯并咪唑,用碘甲烷季胺化得到未见文献报道的环丙基苯并咪唑,通过苯并咪唑与Grignard试剂加成后水解反应制备环丙基甲基酮。

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推荐网络例句

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?