共查询到20条相似文献,搜索用时 46 毫秒
1.
绞股蓝属(Gynostemma)一新种 总被引:3,自引:0,他引:3
本文发表了浙江绞股蓝属一新种,即小果绞股蓝GynostemmazhejiangenseX.J.Xue,sp.nov.(Subgen.Gynostemma)。 相似文献
2.
喙果绞股蓝黄酮类化合物的分离及结构测定 总被引:3,自引:0,他引:3
从喙果绞股蓝(Gynostemma yixingenseC.Y.WuetS.K.Chen.)的茎叶分离到7种化合物:喙果黄素(yixingensin)(I)、山奈酚(kaempferol)(I)、商陆素(ombuin)(Ⅲ)、商甙(om-buoside)(Ⅳ)、槲皮素(quercetin)(V)、异鼠李素(isorhamnetin)(Ⅵ)和硬脂酸(Ⅶ)。其中,喙果黄素为新的黄酮甙,通过光谱分析及化学反应鉴定为商陆素一3-O-β一D一葡萄糖成。 相似文献
3.
4.
四种风毛菊属植物的核型研究 总被引:14,自引:0,他引:14
本文首次报道产于我国华北地区风毛菊属(SaussureaDC.)4种植物的染色体数目和核型。四个种的染色体数目均是2n=26,都是2倍体。它们的核型是:糠风毛菊(S.Paleata)Zn=2x=26=18m+6sm+2st,属2B型,华北风毛菊(S.mongolica)Zn=2x=26=14m+4sm+8st,属2B型;狭苞凤毛菊(S.dielsiana)Zn=2x=26=8m+12sm+6st,属2C型;银背凤毛菊(S.nivea)2n=2x=26=18m+6sm+2st,属2A型。染色体中均未发现随体。 相似文献
5.
绞股蓝抗肿瘤的药理和临床研究进展潘扬,魏菁(南京中医药大学,南京210029)绞股蓝Gynostemmapentaphyllum(Thunb)Mak,为葫芦科多年生草质藤本,又名七叶胆。全世界绞股蓝属植物约有13种,中国有13种,其中7种为我国所特有... 相似文献
6.
绞股蓝雌雄种群觅源行为和繁殖对策比较 总被引:6,自引:0,他引:6
绞股蓝(Gynostemma pentaphyllum)雌雄异株,种群性比偏雄。作者利用比较生态学方法,从行为生态学角度探讨相同生境中绞股蓝雌雄种群的觅源行为和繁殖对策,得到如下初步结果和结论:(1)绞股蓝雄性种群的主枝生物量比显著大于雌性种群,这意味着雄性种群的营养繁殖投资显著增加,而两性种群在其它结构中的生物量分配无显著差异;(2)雌性种群的叶面积比和单位叶面积比雄性种群显著增加,这与两性种群 相似文献
7.
8.
9.
在华南,迄今只在泥盆纪地层中发现豆石介类(leperditiids)。由于它们均具有下垂“V”字型肌痕且此肌痕随时间的推移不断向下延伸,被考虑是豆石介类中一独立的演化支系,并归一新族:Sinoleperditiini。此族,在华南地区含2属和6亚属:Sinoleperditia(Sinoleperditia)Wang,1989,S.(Pseudobriartina)subgen.nov.,S.(Yaosuoleprditia)subgen.nov,Paramoelleritia(Paralaperditia)Sun,1978,P.(Paramoelleritia)Wang,1976和P.(Brevilaperditia)subgen.nov.。重点探讨了此族的起源,演化型式及趋势和绝灭。指出“V”字型或下垂“V”字型肌的功能与闭壳肌可能是异曲同功,起闭壳作用;放射和横向条纹可能是闭壳肌和下垂“V”字型肌频繁收缩所致而不是血管束的痕迹,并可能具有排泻作用;DalelinaSun,1978是ParaleperditiaSun,1978的同物异名;ParaeoloperditiaAdachietIgo,1980属 相似文献
10.
华南泥盆纪分形类豆石分类一新族Sinoleperditiini 总被引:5,自引:1,他引:5
在华南,迄今只在泥盆纪地层中发现豆石介类(leperditiids)。由于它们均具有下垂“V”字型肌痕且此肌痕随时间的推移不断向下延伸,被考虑是豆石介类中一独立的演化支系,并归一新族:Sinoleperditiini。此族,在华南地区含2属和6亚属:Sinoleperditia(Sinoleperditia)Wang,1989,S.(Pseudobriartina)subgen.nov.,S.(Yaosuoleprditia)subgen.nov,Paramoelleritia(Paralaperditia)Sun,1978,P.(Paramoelleritia)Wang,1976和P.(Brevilaperditia)subgen.nov.。重点探讨了此族的起源,演化型式及趋势和绝灭。指出“V”字型或下垂“V”字型肌的功能与闭壳肌可能是异曲同功,起闭壳作用;放射和横向条纹可能是闭壳肌和下垂“V”字型肌频繁收缩所致而不是血管束的痕迹,并可能具有排泻作用;DalelinaSun,1978是ParaleperditiaSun,1978的同物异名;ParaeoloperditiaAdachietIgo。 相似文献
11.
12.
Profiles of SARS-CoV-2 RNA and Antibodies in Inpatients with COVID-19 not Related with Clinical Manifestation: A Single Centre Study 下载免费PDF全文
Zhao Li Gao Ruqin Lu Roujian Wang Huijuan Deng Yao Niu Peihua Jiang Fachun Huang Baoying Liang Jiwei Jia Jing Zhang Feng Wang Wenling Wu Guizhen Tan Wenjie 《中国病毒学》2021,36(5):1088-1092
13.
14.
15.
RICHARD E. NORRIS 《Botanical journal of the Linnean Society. Linnean Society of London》1991,106(1):1-40
Comprises species occurring mostly in subtidal habitats in tropical, subtropical and warm-temperate areas of the world. An analysis of the type species, V. spiralis (Sonder) Lamouroux ex J. Agardh, a species from Australia, establishes basic characters for distinguishing species in the genus. These characters are (1) branching patterns of thalli, (2) flat blades that may be spiralled on their axis, (3) width of the blade, (4) primary or secondary derivation of sterile and fertile branchlets and (5) position of sterile and fertile branchlets on the thalli. Application of the latter two characters provides an important basic method for separation of species into three major groups. Osmundaria , a genus known only in southern Australia, was studied in relation to Vidalia , and its separation from the Vidalia assemblage is not accepted. Species of Vidalia therefore are transferred to the older genus name, Osmundaria. Two new species, Osmundaria papenfussii and Osmundaria oliveae are described from Natal. Confusion in the usage of the epithet, Vidalia fimbriala Brown ex Turner has been clarified, and Vidalia gregaria Falkenberg, described as an epiphyte on Osmundaria pro/ifera Lamouroux, is revealed to be young branches of the host, Osmundaria prolifera. 相似文献
16.
JOAN VALUÈS MONTSERRAT TORRELL NÚRIA GARCIA JACAS 《Botanical journal of the Linnean Society. Linnean Society of London》2001,137(4):399-407
Fifteen chromosome counts of six Artemisia taxa and one species of each of the genera Brachanthemum, Hippolytia, Kaschgaria, Lepidolopsis and Turaniphytum are reported from Kazakhstan. Three of them are new reports, two are not consistent with previous counts and the remainder are confirmations of very scarce (one to four) earlier records. All the populations studied have the same basic chromosome number, x = 9, with ploidy levels ranging from 2x to 6x. Some correlations between ploidy level, morphological characters and distribution are noted. 相似文献
17.
Curcumin is the yellow pigment of turmeric that interacts irreversibly forming an adduct with thioredoxin reductase (TrxR), an enzyme
responsible for redox control of cell and defence against oxidative stress. Docking at both the active sites of TrxR was performed to compare
the potency of three naturally occurring curcuminoids, namely curcumin, demethoxy curcumin and bis-demethoxy curcumin. Results show
that active sites of TrxR occur at the junction of E and F chains. Volume and area of both cavities is predicted. It has been concluded by
distance mapping of the most active conformations that Se atom of catalytic residue SeCYS498, is at a distance of 3.56 from C13 of
demethoxy curcumin at the E chain active site, whereas C13 carbon atom forms adduct with Se atom of SeCys 498. We report that at least
one methoxy group in curcuminoids is necessary for interation with catalytic residues of thioredoxin. Pharmacophore of both active sites of
the TrxR receptor for curcumin and demethoxy curcumin molecules has been drawn and proposed for design and synthesis of most probable
potent antiproliferative synthetic drugs. 相似文献
18.
正Dear Editor,In December 2019, a novel human coronavirus caused an epidemic of severe pneumonia(Coronavirus Disease 2019,COVID-19) in Wuhan, Hubei, China(Wu et al. 2020; Zhu et al. 2020). So far, this virus has spread to all areas of China and even to other countries. The epidemic has caused 67,102 confirmed infections with 1526 fatal cases 相似文献
19.