芽前胡的化学成分

从成都产芽前胡Peucedanum turgeniifolium Wolff.中分离鉴定了12个化合物,分别为香豆素化合物佛手柑内酯(bergapten)(1),异欧芹属乙素(isoimperatorin)(2),(±)diisovaleryl-cis-khellactone(3),(±)dihydrosamidin(4),(±)peuformosin(5),(±)cis-khellactone(6),8-(2’,3’-二羟基,3’-甲基-丁基)-伞形花内酯[8-(2’3’-dihydroxy,3’-methyl-butyl)-umbelliferone](7),(±)selinidin(8),turgeniifolin A(9)以及非香豆素化合物硬脂酸(stearic acid),β-谷甾醇(β-sitosterol),甘露醇(d-mannitol)。     

广西前胡的香豆素成分

从广西前胡Peucedaum guangxieuse Shan et Sheh根及根茎的乙醇提取物中,经硅胶柱层析分析8个化合物,分别鉴定为：香豆素化合物广西前胡素（peguangxenin)(1),白花前胡丁素[( )anomalin](2),伞形花内酯(umbellferone)(3),欧芹属乙素（imperatorin）(4),虎耳草素(pimpinellin)(5);其它类型化合物,falcarindiol(6),阿魏酸(ferulic acid)(7),β-谷甾醇（β-sitosterol）.其中广西前胡素（1）是新化合物,经光谱及化学方法推证其结构为3′(S)-千里光酰氧基-4′（S）-羟基-二氢邪蒿素。     

中甸前胡的化学成分研究

从伞形科植物中甸前胡(Peucedonum sp.)根中分离鉴定了1个新的香豆素化合物,命名为中旬前胡素(d-laserpitin) (1),经各项光谱测定,其结构确定为3′(S)—羟基—4′(S)—当归酰氧基—二氢邪蒿素。另外,还分离鉴定了silinidin(2),蝉翼素(Pteryxin(3),佛手柑内酯(bergapten(4),ammijin (5)等4个已知香豆素化合物和β—谷甾醇(β—sitosterol)。     

旱前胡的化学成分

从云南产早前胡(Ligusticum daucoides Franch.)(伞形科)根的脂溶性部分分离了11个化合物,分别为香豆素化合物:columbianadin,isoedultin,archangelicin,旱前胡甲素(daucoidin A),旱前胡乙素(dsucoidin B),佛手柑内酯(bergapten),非香豆素化合物:falcarindiol(7),阿魏酸(ferulic acid),蜡酸(cerotic acid),β-谷甾醇(β-sitosterol),胡萝卜甙(daucosterol)。其中,化合物4和5是新的香豆素化合物,经化学方法及光谱测定,证明其结构为:4是3′去乙酰基isoedultin,即:2′(S)-(1″,1″-二甲基,1″-当归酰氧基)-3′(R)-羟基-角型二氢呋喃香豆素[2′(S)-(1″,1″-dimethvl,1″-angelovloxv)—3′(R)-hydroxy angular dihydrofuranocoumarin];5是2′-(1″-甲基,1″-羟基,1″-当归酰氧亚甲基)-角型二氢呋喃香豆素[2′-(1″-methyl,1″-hydroXy,1″-angeloyloxy-methylene)angular dihydrofuranocoumarin]。     

南川前胡化学成分的研究

从伞形科前胡属南川前胡的根中分离得到７个化合物,通过理化常数和波这方法确定了其结构,分别是ｄｅｌｔｏｉｎ,佛手相内酯（ｂｅｒｇａｒｐｔｅｎ）,丁二酸（ｓｕｃｃｉｎｉｃ ａｃｉｄ）,甘露醇（ｄ－ｍａｎｎｉｔｏｌ）,二十五烷酸（ｐｅｎｔａｃｏｓａｎｏｉｃ ａｃｉｄ）,β－谷甾醇（β－ｓｉｔｏｓｔｅｒｏｌ）和胡萝卜甙（ｄａｕｃｏｓｔｅｒｅｌ）。以上化合物均为从本植物中首次分得。     

泰山前胡根的化学成分

从伞形科前胡属植物泰山前胡（Ｐｅｕｃｅｄａｎｕｍ ｗａｗｒｉｉ （Ｗｏｌｆｆ）Ｓｕ）的根中分离得到８个化合物,通过理化常数和波谱学方法确定其结构,分别是：Ｐｄ－１ｂ（Ｖ）,ｐｅｕｃｅｄａｎｏｃｏｕｍａｒｉｎⅡ（Ⅵ）,中甸前胡素（ｄ－ｌａｓｅｒｐｉｔｉｎⅧ）,佛手柑内酯（ｂｅｒｇａｐｔｅｎ Ⅳ）,甘露醇（ｄ－ｍａｎｎｉｔｏｌ Ⅰ）,二十六烷酸（ｈｅｘａｃｏｓａｎｏｉｃ ａｃｉｄ Ⅲ）,β－谷甾醇（β     

马山前胡的香豆素

从马山前胡(Peucedanum mashanense Shan et Sheh)中分离得到4个化合物,鉴定为香豆素化合物白花前胡丙素[( )pareruptorin A],白花前胡丁素[( )anomalin],虎耳草素(pimpinellin)和β-谷甾醇(β-sitosterol)。     

雪兔子的成分研究

从雪兔子(Saussurea gossypiphora D.Don)中首次分得6种结晶物,经红外光谱、紫外光谱、质谱和核磁共振谱等方法鉴定为:伞形花内酯(umbelliterone)(Ⅰ)东莨菪素(scopole-tin)(Ⅱ),β-谷甾醇(β-sitosterol)(Ⅲ),芹菜素(apigenin)(Ⅳ),芹菜素7-葡萄糖甙(api-genin 7-O-β-D-glucoside)(Ⅴ),伞形花内酯甙(umbelliteione 7-O-β-D-glucoside)(Ⅵ)。     

紫花前胡的提取工艺优化研究

目的:采用多指标综合评分法结合响应面法优选紫花前胡香豆素类成分的最佳提取工艺参数.方法:通过HPLC检测紫花前胡中的化学成分伞形花内酯、紫花前胡苷、补骨脂素、花椒毒素和佛手柑内酯的含量,以综合评分值作为评价指标,并对液料比、甲醇浓度和超声时间进行考察,且在单因素试验基础上,运用Box-Behnken设计响应面法优化提取...     

俯卧前胡的化学成分

从伞形科植物俯卧前胡(Peucedanum decumbens Maxiam)的根中分离鉴定了13个成分,其中化合物(1)是一个新的二氢呋喃香豆素,经各项光谱测定,确定其结构为:顺式-2′-(1″-甲基,1″-千里光酰氧基-乙基)-3′-羟基-线型二氢呋喃香豆素,命名为俯卧前胡素(decumbensol)。     

Selection with two alleles and complete dominance

For a plant selection model with frequency-independent viabilities, fertilities and selfing rates, it is shown that apart from global fixation, for certain parameter combinations a protected polymorphism and facultative fixation (either allele may become fixed according to initial frequencies) may both occur. Facultative fixation requires different selling rates for the dominant and recessive type. Protection of the polymorphism requires resource allocation for male and female function. In this connection the problem of purely genetically caused population extinction is discussed.
For general frequency dependence and regular segregation, the chances for establishment of a completely recessive gene are compared to those of a completely dominant gene. It is proven that the process of establishment of the recessive gene, despite a fitness advantage, may be considerably endangered by drift effects if random mating prevails. The recessive gene may reach the same effectivity in establishment as a dominant gene, only if the recessive homozygote mates exclusively with its own type during the period of establishment.     

杆状病毒出芽病毒粒子膜融合蛋白的研究进展

杆状病毒是一类感染节肢动物的病原微生物,其基因组为双链环状DNA,大小为80～180kb.     

Inception of the Modern Public Health System in China and Perspectives for Effective Control of Emerging Infectious Diseases: In Commemoration of the 140th Anniversary of the Birth of the Plague Fighter Dr. Wu Lien-Teh

In this article, we systematically review Dr. Wu Lien-Teh's academic achievements and outstanding contributions in the prevention and control of the plague epidemic in northeast China and introduce the development of the earliest public health epidemic prevention system in China in order to commemorate the 140th anniversary of Dr. Wu Lien-Teh's birth. We hope that this article will provide insights into the effective prevention and control of emerging infectious diseases as well as the current worldwide pandemic of COVID-19, facilitating the improvement and development of public health systems in China and around the globe.