查询词典 flavones

Total synthesis of bilobetin and isoginkgetin, natural polyhydroxy biflavones with a Ⅰ-3'/Ⅱ-8 dissymetrical connection, and synthesis of acetyl flavones were investigated in this dissertation.

本论文对天然多羟基不对称连接的双黄酮-白果素、异银杏素的合成以及乙酰基黄酮的合成进行了研究，共包括以下内容

ObjectiveTo study an extraction technology for total flavones from leaves of Psidium guajava L.

目的为充分利用番石榴叶资源，优选番石榴叶总黄酮的最佳提取工艺。

Plant polyphenols, an excellent natural antioxidant, has been studied extensively, while the extracting techniques of polyphenols, oligoprocyanidms and flavones in the root of sanguisorba haven't been reported in China.

植物多酚是一种优良的天然抗氧化剂，国内外从多个领域、多种角度对植物多酚进行了广泛的研究工作，而对地榆中多酚、低聚原花青素以及黄酮浸提工艺研究国内尚未见报道。

In this paper the determination conditions of flavones in soya sauve by Davis method were optimized.

对酱油中总黄酮的Davis法测定影响因素作了较深入研究，并优化分析过程，获得较佳操作条件。

Results :Stachys geobombycis may contain constituents, alkaloids,flavones and glycosides,ploysugars and organic acid etc .

结果 地蚕中可能含有生物碱、黄酮及其苷类、多糖、有机酸等成分。

Result The extraction conditions of flavones from Tricholoma giganteum by microwave-assisted method were optimized as 40:1 of the liquid-solid ratio, 60% ethanol to twigs and microwave power of 255 W for 5 min.

结果］微波萃取法最佳提取条件：乙醇浓度60%、液固比40：1、微波功率255W、微波时间5min。

These products are also helpful for eliminating oxygen freebase, strengthening energy of human body, improving immunotherapy, prolonging life etc. Qinghai Comped Biological Preparation Co., Ltd, has built a modern sea buckthorn production base, with 80million new investment. Series of products including concentrated sea buckthorn juice, sea buckthorn powder, sea buckthorn seed oil , sea buckthorn berry oil, general sea buckthorn flavones, and sea buckthorn tea. have been sold successfully to producers of food and beverage, medicine, cosmetics and so on.

青海康普德生物制品有限公司依托青藏高原丰富的沙棘资源，投资近8000万元人民币，建成了国内一流的沙棘系列产品生产基地，其中浓缩沙棘汁，沙棘果粉，沙棘籽油，沙棘果油，沙棘总黄酮，沙棘茶以及具有青藏高原特色的果蔬粉系列已经投放市场，为保健品，药品，化妆品等行业提供新型原辅材料，为人类健康作贡献。

Result:Characteristics of the tangentical longitudinal section of stem with resin and surface view of leaves were elucidated.Besides xylem vessels and fibers of the stem,it was found that the red resin also exists in the cortex parenchyma cells of the stem and the medulla and xylem of the root.According to the HPLC fingerprint analysis result of the stems with and without resin,a number of flavones and stilbenoids were detected in the stem in which resin appeared after it wounded.

结果：阐明了含树脂茎的纵切结构以及叶的表面观特征；除了茎木质部导管和纤维中有树脂外，发现剑叶龙血树受到损伤之后在茎皮层薄壁细胞、根的髓部和木质部亦有树脂的分布；含树脂茎和无树脂茎的指纹图谱显示剑叶龙血树茎在形成树脂后的化学成分中出现了较多的黄酮类、茋类成分。

Phytochemical investigation on the acetone extract of the stems of K.oblongifolia led to the isolation of 49 compounds and 31 of them were identified.They were 20 lignans,(including 11 dibenzocyclooctadienes,8 spirobenzofuranoid dibenzocycloocta -dienes,1 other lignan),9 flavones,and 1 nortriterpenoid.Among them,4 were new compounds,1 was new natural products,and 8 compounds were isolated from this family for the first time.

通过对冷饭藤的藤茎化学成分的研究，从丙酮提取物中分离得到49个化合物，鉴定了31个化合物，包括木脂素类化合物20个(联苯环辛烯类木脂素11个，螺苯骈联苯环辛烯类木脂素8个，其他类型木脂素1个)，黄酮类化合物9个，降三萜类化合物1个，其中。4个为新化合物，1个新的天然产物，8个为本科首次报道。

Aim:To study the effects of total flavones of metasequoia on arrhythmias.

目的：研究水杉总黄酮对心律失常的作用。

The absorption and distribution of chromium were studied in ryeusing nutrient culture technique and pot experiment.

采用不同浓度K2CrO4(0，0.4，0.8和1.2 mmol/L)的Hoagland营养液处理黑麦幼苗，测定铬在黑麦体内的亚细胞分布、铬化学形态及不同部位的积累。

By analyzing theory foundation of mathematical morphology in the digital image processing, researching morphology arithmetic of the binary Image, discussing two basic forms for the least structure element: dilation and erosion.

通过分析数学形态学在图像中的理论基础，研究二值图像的形态分析算法，探讨最小结构元素的两种基本形态：膨胀和腐蚀；分析了数学形态学复杂算法的基本原理，把数学形态学的部分并行处理理念引入到家实际应用中。