查询词典 betulinic

This paper reviewed the study situation of several forest chemical products associated with medical and health such as sterols,paclitaxel, betulinic acid and hinokitol.

综述了植物甾醇、紫杉醇、桦木酸、桧木醇等几种与医药保健品有关的林产化学品的研究开发现状。

Een though researchers understood that PA-457 seemed to hae actiity against all strains of HI, they needed to find out how the betulinic acid deriatie worked against the irus on the molecular leel.

研究人员了解到PA-457似乎可对抗所有品系的HI后，还需要知道桦木酸的衍生物在分子层次上怎样对付病毒。

Results 30～80μg/ml 23-hydroxyl betulinic acid in vitro and 300mg/kg～600mg/kg P.O.in vitro markedly inhibited the growth of B16 cells at a dose-dependent manner with a great number of apoptotic cells seen.

结果 23-羟基桦木酸体外30～80μg/ml处理，体内300mg/kg～600mg/kg灌胃时，对B16细胞有显著的生长抑制作用，有一定的剂量依赖关系并出现大量的凋亡细胞，同时体内肿瘤细胞被阻滞在G0～G1期，DNA合成受阻，肿瘤体积缩小。

In the fifth chapter, a series of betulin derivatives including 28-acetoxybetulin, 28-tritylbetulin, 28-benzoylbetulin, 3-0-P-D-glucopyranoside of betulin and some betulinic acid conjugate containing amino acid were synthesized and confirmed by MS and NMR.

第五章分别合成得到了乙酰化白桦酯醇、28-苯甲酰化白桦酯醇、28-三苯甲基化白桦酯醇、3-O-β-D-glucopyranoside of betulin和一系列的白桦酯酸苷氨酸的衍生物，并分别对其进行了结构鉴定。

Betulin, a naturally occurring triterpene, available in abundance up to 10% dry weight of bark from white birch bark, seems to be an ideal starting material for the synthesis of betulinic acid.During a discovery effort from natural resources, in order to seek new biologically active compounds, reaearch on chemical modifications of valuable precursors have been demonstrated to be an effective path to resolve the water solubility problem and increase bioavailability.

从自然界寻找先导活性化合物，再进行结构修饰，试图提高其活性，降低其毒副作用，并提高其水溶性，是创新药物的一条重要思路，而且在新药研制中也得到了很好的应用并取得了显著的成绩。

In the fifth chapter, a series of betulin derivatives including 28-acetoxybetulin, 28-tritylbetulin, 28-benzoylbetulin, 3-O-β-D-glucopyranoside of betulin and some betulinic acid conjugate containing amino acid were synthesized and confirmed by MS and NMR.

第五章分别合成得到了乙酰化白桦酯醇、28-苯甲酰化白桦酯醇、28-三苯甲基化白桦酯醇、3-O-β-D-glucopyranoside of betulin和一系列的白桦酯酸苷氨酸的衍生物，并分别对其进行了结构鉴定。

Betulinic acid had actiity against HI at the micromolar leel," says Graham Allaway, Panacos's chief operating officer."This deriatie had actiity at the nanomolar leel.

Panacos的执行长艾拉威说：桦木酸在微莫耳浓度的范围有抗HI活性，而这个衍生物的作用浓度是奈莫耳浓度。

In the forth chapter, betulin was oxidized by Jones oxidation in step 1 and converted to betulonic acid, then betulonic acid was reduced by sodium borohydride in step 2 and converted to betulinic acid.

第四章使用琼氏氧化剂氧化白桦酯醇，硼氢化钠还原制得白桦酯酸。

Our strong products are: Rhodiola rosea extract, Luteolin, Chamomile extract, Apple extract, Betulin, Betulinic acid, Red wine P.E., Bamboo leaf extract, etc.

公司核心产品有红景天提取物，木犀草素，洋甘菊提取物，苹果提取物，红酒提取物，白桦酯醇，白桦酯酸，竹叶提取物等。

Betulin, extraction, solubility, betulinic acid, derivative, synthesis

关键字或关键词组：白桦酯醇，提取，溶解度，白桦酯酸，衍生物，合成

But we don't care about Battlegrounds.

但我们并不在乎沙场中的显露。

Ah! don't mention it, the butcher's shop is a horror.

啊！不用提了。提到肉，真是糟透了。