吊石苣苔的研究进展

吊石苣苔所含化学成分主要为黄酮类、苯乙醇类、β-谷甾醇、熊果酸等，具有显著的抑茼、抗炎、抗病毒、止咳、祛痰、平喘等活性，且无明显不良反应，值得进一步研究．综述了国内外在吊石苣苔的化学成分、药理作用和临床应用方面的研究进展．     

不同采收期吊石苣苔中石吊兰素含量的动态研究

为确定吊石苣苔最佳采收期提供科学依据，采用RP-HPLC法测定中药材吊石苣苔中不同采收期石吊兰素的含量，测定结果表明不同采收期吊石苣苔中石吊兰素的含量以5月份为高，建议吊石苣苔药材应在春夏时期采收。     

黔东南吊石苣苔药用植物资源的调查研究

通过野外调查、标本采集及资料考证,摸清了黔东南苦苣苔科吊石苣苔药用植物资源及地理分布情况.     

拜伦苣苔属(Bellonia L)的研究(英文)

对拜伦苣苔属(Bellonia L.)作了订正,讨论了它的种间关系和与其他属的联系,对本属的进化方向作了论述。研究工作主要依据世界各地的馆藏植物标本,并采用扫描电子显微镜技术分析了孢粉和种子的形态。拜伦苣苔属隶于苦苣苔科(Gesneriaceae)苦苣苔亚科(Gesnerioideae),含2种,分布于加勒比海地区的古巴和海地岛。法国 Plumier于1703年发表了这个属,取名为“Bellonia”,后来林奈(Linnaeus,1737)确认了这个属,并为本属的模式种采用了双名(Belloniaaspera L.) 拜伦苣苔属在形态上十分独特它是苦苣苔科中唯一具刺的属。它的花被管中的雄蕊维管束单独发生而有别于同一科中的其他属。它的可育雄蕊数目5～8个,和苦苣苔科一般的2或4个可育雄蕊截然不同,它的花冠结构也独具一格,没有明显的花冠管,辐射对称;苦苣苔科一般花冠两侧对称。花冠管明显,不过,这个属的子房和果实结构符合苦苣苔亚科的特征,一室两个侧膜胎座。本属含两个种:糙叶拜伦苦苣(B.aspera L.)和刺拜伦苣苔(B.spinosa Sw.),它们从形态学上是独立的明显可分的种,前者具有明显的聚伞花序,植株无刺,抱粉的表面纹饰较为粗糙;后者的花序明显单花,植株多刺,孢粗表面纹饰较为平滑,分析它们的形态学,糙叶拜伦苣苔是原始的,刺拜伦苣苔是次生的。形态演化的方向比较明显:从聚伞花序通过花的数目的减少和花序轴的短缩而简化为单花;花序的来源是一个叶腋内生的短缩的枝条;植株上的刺和花序同源,是花序不育化而形成的。推测在进化过程中,为了减少营养的消耗而减少了花的数目,从而以尽可能好的营养保证可育花的质量。这个属可能起源于石灰岩植物区系,比较原始的糙叶拜伦苣苔仅发现于海地岛南部的石灰岩上。较为进化的刺拜伦苣苔则在石灰岩和非石灰岩基质上都有分布,分布区遍布于海地岛并延伸至古巴岛上。这符合一般的规律:进化的后代常常适应能力较强,分布区也较广。一般认为石灰岩植物区系具较多的有刺植物,但在本属中无刺的糙叶拜伦苣苔反倒是一个石灰岩特有植物,而多刺的刺拜伦苣苔则广布到非石灰岩生境上。这表明,石灰岩生境和植物的刺形态学没有直接的联系,可能种系发生学对植物的形态具有比环境更大的影响。     

非洲紫罗兰的组织培养和快速繁殖

非洲紫罗兰的组织培养和快速繁殖陕西师范大学生命科学学院（７１００６２）路正社屈新运非洲紫罗兰（ＳａｉｎｔｐａｕｌｉａｉｏｎａｎｔｈａＷｅｎｄｌ．），又称大花非洲苦苣苔，属苣苔科非洲紫罗兰属植物，原产于非洲。由于其花色鲜艳，有紫、粉红、青白和复色等各种...     

石荠苎的研究现状综述

石荠苎有很高的药用价值,综述其生理生态学、化学成分和遗传多样性等,并对该属植物的研究做了展望.     

石阡苔茶茶多酚超声波辅助提取工艺的响应面优化

为了探讨石阡苔茶茶多酚提取的最佳工艺条件,以石阡苔茶为原料,蒸馏水为提取溶剂,采用四因素三水平的响应面分析法,建立了料液比、超声波提取时间、提取温度和超声波功率四因子与茶多酚提取率的回归方程模型。结果表明：超声提取温度为75℃,超声波提取时间为34min,超声功率为348W,液料比为22：1V/W时,茶多酚提取率达到29.0557％,与最佳值（29.0592%）基本吻合。经优化的石阡苔茶茶多酚的提取工艺具有提取时间短、提取率高与毒性小等优点。     

松花石砚与辽砚制砚用石质品及色系研究

松花石砚与辽砚制砚用石的质品和色系的定名,是雕制名品砚台的必备条件.文章以"四大名砚"的矿物组成 、矿物粒度、矿物结构、化学成分、硬度、比重等经验指标为参考,用现代科技试验手段,提出制砚用松花石砚料(含辽砚砚料)质品的优选方法,并用色彩学,色系的分类法对制砚用石的色系进行科学合理的定名,旨在为松花石砚与辽砚制砚用石提供依据.     

中国苦苣苔科的研究(六)

细筒苣苔属 Lagarosolen W.T.Wang,gen.nov. (Cyrtandroideae-Didymocarpeae) Affinis Chiritae D.Don a qua corolla elongata,tubo tenuiter cylindrico limbo2.5—3-plo longiore,filamentis rectis,stylo apice 2-lobato,lobis subaequalibusintus stigmatosis differt. Calyx campanulatus,ad basin 5-sectus,segmentis lanccolato-lincaribus.Corollapurpurea,bilabiata,tubo tenuiter cylindrico limbo 2.5—3-Plo longiore utrinquepaulo ampliato,labio postico 2-Jobato,labio antico 3-lobato,lobis angustetriangularibus apice longe attenuatis.Stamina 2 antico-lateralia fertilia,inclusa,     

石荠苎的研究现状综述

石荠苎有很高的药用价值,综述其生理生态学、化学成分和遗传多样性等,并对该属植物的研究做了展望．     

卡思卡特城堡

It is worthy of noting that, whilst Crookston Castle witnessed the earlier and happier portion of Mary's variegated life,     

不同的吃喝玩乐

一、吃和喝吃苹果 eat an apple, 吃药 take medicine,吃糖 have some sweets,吃饭 have one's meals,吃馆子 dine out,吃惊 be surprised/     

漏洞百出的教育

Many college freshmen arrive woefully unprepared to do college work, and as disadvantaged populations continue to grow, the share of the American work force that has made it through college is expected to plummet. Many experts blame that educational failure not just on high schools but also on colleges. School & College, a special report by The Chronicle, looks at efforts to fix the system. What reforms would better prepare students for college? What should schools and colleges be doing differently? How should state and federal officials help?     

只要努力,不要后悔

There are numbers of crossroads on our long and unpredictable life journey where we totally have no idea about which direction to choose. No matter what our decision is, we should not turn back, but face the music and go ahead instead. I am this kind of girl who always does try without regretting, one example is how I dealt with my love.     

浅谈移民问题

Migration occurs behind a variety of reasons and has a great effect on the whole world. People may migrate in order to improve their economic situation, or in order to escape civil strife, persecution, and environmental disasters. The impact of migration is complex, bringing both benefits anddisadvantages. This paper briefly talks about the causes of migration, the allocation of benefits, and the ways in which individual countries and the international community deal with this important subject.     

Sister Carrie, an Adherent of Desires

Sister Carrie is one of the most controversial characters in American literature.Thought as a "fallen woman" firstly,she was defined as a "new woman" by some critics later. However, by digging into the motivaton behind the whole process of Carrie's "success", the relationship between Carrie and her creator (the author), the social conditions of then American, it can be found that Carrie has never been free-standing on her thought and she has never found her real-sdf even after becoming a famous actress. In a society dominated by mass consumerism Carrie is only an adherent of her own desires. She also is a representative of all those country girls flooded into cities, a symbol and a sacrifice of the urbanization of America in a time countryside was overcome by cities.     

Improvement of one-cycle controller by use of proportional integral differential controller

1.IntroductionOne-cyclecontrolmethod,whichwasproposedaboutonedecadeago[1],hasbecomeanattractivemethodinspecialfieldssuchaspowerfactorcorrection[2-6],switchingamplifiers[7,8],etc.Themainideaofthiscontrollerisbasedonintegrationofdiodevoltageinone-cycleandforcesittobeexactlyequaltothereferencevalue.Themainadvantageofthiscontrollerisitsrealtimeabilitytorejectthevariationofinputvoltage[1].Despitethisgreatability,ithasnogoodperformancesinrejectingofloaddisturbanceandfollowingreferencecommands.Espec…     

库克斯顿城堡

城堡, 是欧洲典型的建筑之一, 每个城堡都有一个美丽的传说或是一段历史。从本期开始, 我们将推出“城堡之旅”, 带各位读者去浏览、观赏欧洲各地的城堡, 开始一段文化与历史的旅途!     

胡主席在印度,我却在中国

Today, Sunday morning, I sit thinking and typing at my computer. My thoughts are in my homeland, India and my body is in China. The body is here and mind there for a good reason. Mr. Hu is president and I am resident and both are in each other's countries (what a difference the absence of one small letter makes!). Mr. Hu will return in a few days and I will stay on longer.