查询词典 isolated substance

We investigated constituent of triterpenoid saponins ofAlbizzia, two new compounds together with two known compounds were isolated from Albizzia julibrissin Durazz. by using column chromatography (macroreticular resin, silica gel, Sephadex gel, reverse phase silica gel),preparative HPLC methods et al.On the basis of spectroscopic analysis, including IR,ESI-MS,~1H-NMR,~(13)C-NMR,HMBC,HMQC,~1H-~1HCOSY and chemical methods, the structure of two new compounds were identified as 3 - O -[β-D-xylopyranosyl(1→2)-β-D-fucopyranosyl (1→6)-β- D -2- deoxy - 2 - acetoamidoglucopyranosyl] -21-O-[(6S)-2- trans- 2,6-dimethyl - 6 - O-β- D - quinovopyranosyl -2,7- octadienoyl] - acacic acid- 28 - O-β-D-glucopyranosyl(1→3)[α-L-arabinofuranosyl(1→4)]-α-L-rhamnopyranosyl(1→2)-β-D-glucopyranoside acacic acid 3- O -β- D- glucopyranosy(1→3)-β- D- fucopyranosl(1→6) [β-D- xylopyranosyl (1→2)]-β-D-glucopyranoside ;two known compounds were acacic acid lactone 3- O -β-D- xylopyranosyl-(1→2)-β-D-fucopyranosl (1→6)- 2-deoxy -2 -acetoamido -β-D- glucopyranoside ; acacic acid lactone 3- O-β-D-xylopyranosyl(1→2)-α-L- arabinopyranosl (1→6)- 2- deoxy - 2- acetoamido -β-D-glucopyranoside . The study lays chemical foundation and chemical reference substance for enhancing quality standard of Albizzia julibrissin Durazz.

本研究论文在综述国内外对合欢属Albizzia三萜皂苷化学成分和药理作用研究进展的基础上，利用传统植化分离手段和现代分离技术，包括大孔树脂、硅胶、葡聚糖凝胶、反相硅胶等柱色谱，制备高效液相色谱法等技术从中药合欢皮中分离得到了4个化合物，其中，2个新化合物和2个己知化合物，并进一步通过现代分析技术IR，ESI-MS，~1H-NMR，~(13C-NMR，HMBC，HMQC，~1H-~1HCOSY等和化学方法鉴定了2个新化合物的结构分别是：3-O-[β-D-吡喃木糖基(1→2)-β-D-吡喃夫糖基(1→6)-β-D-2-去氧-2-乙酰氨基吡喃葡萄糖基]-21-O-[(6S)-2-反式-2，6-二甲基-6-O-β-D-吡喃鸡纳糖基-2，7-辛二烯酸基]-金合欢酸-28-O-α-L-呋喃阿拉伯糖基(1→4)[β-D-吡喃葡萄糖基(1→3)]-α-L-吡喃鼠李糖基(1→2)-β-D-吡喃葡萄糖苷，金合欢酸3-O-β-D-吡喃葡萄糖基(1→3)-β-D-吡喃夫糖基(1→6)[β-D-吡喃木糖基(1→2)]-β-D-吡喃葡萄糖苷；2个已知化合物结构分别是：金和欢酸内酯3-O-β-D-吡喃木糖基(1→2)-β-D-吡喃夫糖基(1→6)-β-D-2-去氧-2-乙酰氨基吡喃葡萄糖苷，金和欢酸内酯3-O-β-D-吡喃木糖基(1→2)-α-L-吡喃阿拉伯糖基(1→6)-β-D-2-去氧-2-乙酰氨基吡喃葡萄糖苷。

They claimed to have isolated a substance from the cerebrospinal fluid of dogs that had been deprived of sleep for 6 to 15 days.

他们俩从有6至15个小时没有睡觉的狗的脑髓液中分离出一种物质。

For observing the resistance of clinically isolated gonococcus and the standard bacterial strain to chemical disinfectants, standard strain with relatively high resistance was selected to carry out organic interfering substance test.

观察临床分离的淋球菌和标准菌株对化学消毒剂的抗力，选择抗力较高的标准菌株作有机干扰物试验。

At last science has isolated young skin's own natural humectant, a moisturizing substance that may diminish up to 50% as you age P.C.A.

你变老 P.C.A。的时候，最后科学已经隔离年轻的皮肤自己的天然脱湿剂，可能减少达到 50%的润湿物质。

When a substance in an isolated system changes phase, the total amount of mass does not change.

在孤立系统内物质的物理或化学性质的变化过程中，总质量保持不变。

It is difficult to study element 104 because only a few atoms of this substance can be isolated at one time.

对104 号元素进行研究很困难，因为一次只能分离出这种物质的几个原子。

Compound 1 was first isolated as a natural substance, and compounds 2-6 were isolated from nidus vespae for the first time.

化合物1为首次分离得到的天然产物，化合物2~6均为首次从蜂房中分离得到。

Do you think it would ever occur to a chemist to discredit these conclusions by the argument that the isolated substance might have had some other weight?

那么，你认为一个化学家会因为这一分离出来的物质也许有其他重量，而不相信这些结论呢？

J iawei Sijunzi Decoction ; Spleen Deficiency Syndrome ; movement of isolated duodenum ; substance P ; antibody of substance P

加味四君子汤；脾虚；离体十二指肠活动； P 物质； P 物质抗体

The antibiotic substance was isolated and purified primary using the methods of solvent extraction and Thin Layer Chromatography. The results showed that the antibiotic substance contained four components, and the component Ⅰ and Ⅱ had bioactivity against Cmm.

通过乙酸乙酯抽提、旋转蒸发制备的活性物质粗提液经薄层层析分析后，共分离出四个组份，其中仅组份Ⅰ与组份Ⅱ对番茄溃疡病菌表现抑制作用；紫外及可见光区的吸收峰分别为：253 nm、424 nm和443 nm。

It is also known as one of the most poisonous naturally occurring substances.

它也被称为一个最自然发生的有毒物质。

The greatest stress is found at the location on the cross section where V is the largest.

最大应力出现在横截面上V为最大的地方。