天然的物质

Methods The article applied the orthogonal design to find out the optimum proportion of the rutin, soybean isoflavone and curcumin. The free radical DPPH scaving ratio was used as evaluating standard of orthogonol design and the hominal liver cancer cell SMMU-7721 was used in MTT trial to evaluate the inhibitory ability of the compound. Results The optimum proportion of rutin-soybean isoflavone-curcumin 2:3:7 was achieved.

选取3种天然植物抗氧化物质芦丁、大豆异黄酮、姜黄素，利用正交试验设计选择合适配方，以自由基DPPH的清除率作为正交试验评价标准，并利用人肝肿瘤细胞SMMU-7721进行四甲基偶氮唑盐试验来考察配方体外试验对肿瘤细胞的抑制作用。

Malek and Frank found what they were looking for in a collection of natural substances which had originally been isolated from microorganisms which live in soil the so called Myxobacteria.

马利克和弗兰克发现他们在寻找什么在一个最初是从土壤中微生物的分离天然物质生活收集的所谓粘细菌。

However, a large number of compounds found in single cells are nonfluorescent.

但是细胞内绝大部分物质其天然态是没有荧光的，且由于细胞膜的阻碍，衍生试剂不能自由地进入细胞内。

However, a large number of compounds found in single cells are nonfluorescent and cell membrane acts as a barrier to the free diffusion of derivatization reagents into cells.

但是细胞内绝大部分物质其天然态是没有荧光的，且由于细胞膜的阻碍，衍生试剂不能自由地进入细胞内。

Ornithine decarboxylase, a rate-determining enzyme of the polyamine biosynthetic pathway, is involved in the control of cell cycle, differentiation, cell growth and apoptosis. Previous studies described that protein kinase Cd regulates ODC activity. In this thesis, human leukemia cell line, HL60 cell, was used for the treatment with a specific PKCd inhibitor, rottlerin, to measure the effects on cell growth.

鸟胺酸去羧化（ornithine decarboxylase，ODC）为多胺酸起始与决定反应速率的酵素，对细胞周期、细胞生长、分化及细胞凋亡扮演一重要角色；在寻找肿瘤治疗及预防药物研究中，纯化植物天然物质是其中来源之一，研究者筛选药物时，测定对鸟胺酸去羧化活性是否具抑制效果是一个重要的试验。

Chiral 3 methy 1,4 butanediol and its derivatives are the important intermediate of synthesis of chiral smectic liquid crystal polyesters and chiral natrual products with biological activity. In the paper, a new efficient route of 3 methyl 1,4 butanediol and its two derivatives, 2 methyl 4 tetrapyranyloxy 1 butanol and 2 methyl 4 tetrapyranylbutanal, was described, and the target products were synthesized by employing asymmetric hydroboration oxidation improved.

手性2－甲基－1，4－丁二醇及其衍生物是合成各种手性近晶型液晶材料以及手性天然生物活性物质的重要中间体，以3－甲基－3－丁烯－1－醇为原料利用改进的不对称硼氢化－氧化反应，成功地合成了－2－甲基－1，4－丁二醇以及其2种手性衍生物：－2－甲基－4－四氢吡喃氧基－1－醇和－2－甲基－4－四氢吡喃氧基丁醛。

The samples were saponified for 45 minutes by 2.0 mol/L alcoholic potassium hydroxide solution in water bath at 85℃, then the products were extracted with petroleum ether.

早在上世纪 5 0年代，植物甾醇作为一类天然物质，被确认具有抑制胆固醇在肠内的吸收，降低胆固醇含量的生理功能作用[1，2 ] 。

Protection for Foetuses: Natural antioxidants such as apple polyphenol and Vitamin E protect against aggression of excessive radicals and enhance protection of the foetuses

胚胎保护：添加苹果多酚和维生素 E 等天然抗氧化物质，抵御自由基的侵害，加强对胚胎的保护

Solid goldthread extractive was investigated as an excellent natural green inhibitor .

从黄连中提取出的固体物质，可做为一种优良的天然绿色缓蚀剂。

Objective: to extract pungent flavours from the abandoned mustard skin.To study in the optimum hydrolytic conditions of glucosinolates in mustards skin.

目的：从废弃的芥菜皮中提取辛辣风味物质(硫代葡萄糖苷酶解产物异硫氰酸酯)，研究其最佳水解条件，为天然调味品生产提供新的原料来源和理论参考。

They weren't aggressive, but I yelled and threw a rock in their direction to get them off the trail and away from me, just in case.

他们没有侵略性，但我大喊，并在他们的方向扔石头让他们过的线索，远离我，以防万一。

In slot 2 in your bag put wrapping paper, quantity does not matter in this case.

在你的书包里槽2把包装纸、数量无关紧要。