Search results for "Ligularia"
showing 9 items of 9 documents
Eremophilane Derivatives with a Novel Carbon Skeleton from Ligularia veitchiana
1997
Abstract Ligulaverin A 1, an eremophilane derivative with a novel carbon skeleton, was isolated from the medicinal plant Ligularia veitchiana, along with four analogues (ligulaverin B 2, ligulaverin C 3, ligulaverin D 4 and ligulaverin E 5). Their structures were elucidated by NMR techniques and X-ray diffraction. The biosynthetic route to this nineteen-carbon skeleton is discussed. © 1997 Elsevier Science Ltd.
ENDOPOLYPLOIDY OF ENDANGERED PLANT SPECIES LIGULARIA SIBIRICA IN DIFFERENT ENVIRONMENTS
2017
The goal of this study was to detect endopolyploidy of Ligularia sibirica from populations existed in different ecological conditions. This is important step to elaborate the appropriate protection measures of rare and endangered species, which should be based on understanding of ongoing processes in populations. From this point of view the knowledge of genetic diversity, including endopolyploidy level between and within populations, is crucial. L. sibirica is endangered and protected plant species in Latvia which is included in the protected plants list of EU Habitat directive 92/43/EEK Annexes 2 and 4. Perennial herbaceous plant L. sibirica is one of two species of genus Ligularia in Euro…
Botāniskā dārza sekciju "Augu daudzveidības pētījumi ex situ" un "Augu selekcija un introdukcija" tēžu krājums (2020. gada 30. janvāris, LU Botāniska…
2020
Latvijas Universitātes 78. starptautiskā zinātniskā konference LU Botāniskajā dārzā notiek 2020. gada 30. janvārī. Krājumā ir 13 ziņojumu kopsavilkumi: pieci kopsavilkumi LU prioritārās tēmas "Ekoloģija un bioloģiskā daudzveidība" apakštēmas/sekcijas "Augu daudzveidības pētījumi ex situ" un astoņi kopsavilkumi sekcijas "Augu selekcija un introdukcija" ziņojumiem.
ChemInform Abstract: New Umbelliferone Sesquiterpene Ethers from Roots of Ligularia persica.
2010
An extract of roots of Ligularia persica yielded thirteen umbelliferone sesquiterpene ethers, among them the new ones ligupersin A (11) and ligupersin B (13).
New umbelliferone sesquiterpene ethers from roots ofLigularia persica
1991
An extract of roots of Ligularia persica yielded thirteen umbelliferone sesquiterpene ethers, among them the new ones ligupersin A (11) and ligupersin B (13).
Germacrane esters from roots of Ligularia persica
1991
Abstract Extraction of roots of Ligularia persica and chromatographic separation yielded one new derivative of tovarol, four new derivatives of shiromodiol, α- and β-eudesmol, bakkenolide A and four known eremophilane derivatives.
A new dibenzofuran and other constituents from Ligularia caloxantha, a Chinese medicinal plant.
2008
A new dibenzofuran named 1,2,4-trimethyl-7,8-dimethoxy-dibenzofuran (1), together with seven known compounds, euparin (2), 2,5-diacetyl-6-hydroxy-benzofuran (3), 2-acetyl-5,6-dimethoxy-benzofuran (4), gummosogenin (5), lupeol (6), stigmasterol (7) and (E)-2,5-dihydroxy-cinnamic acid (8), were isolated from the roots of Ligularia caloxantha, a Chinese medicinal plant. The structures of the compounds were elucidated by spectroscopic methods.
Four new eremophilendiolides from Ligularia atroviolacea
2007
From Ligularia atroviolacea, four new eremophilendiolides, 8 beta-hydroxy-eremophil-3,7 (11)-dien-12,8 alpha(14,6 alpha)-diolide (1), 8 beta-methoxy-eremophil-3,7(11)-dien-12,8 alpha(14,6 alpha)-diolide (2), 8 alpha-hydroxy-eremophil-3,7(11)-dien-12,8 beta(14,6 alpha)-diolide (3) and eremophil-3,7(11),8-trien-12,8 (14,6 alpha)-diolide (4), as well as a known diolide (5) were isolated. Their structures were elucidated on the basis of 1D and 2D NMR as well as ESI-MS spectral data. (c) 2006 Yu Zhao. Published by Elsevier B.V. on behalf of Chinese Chemical Society. All rights reserved.
Sibīrijas mēlziedes Ligularia sibirica (L.) Cass. demogrāfisko parametru ietekmējošie faktori Latvijā
2017
Sibīrijas mēlziede ir apdraudēta suga gan Latvijā, gan pasaulē. Latvijā Sibīrijas mēlziede sasniedz areāla Eiropas daļas rietumu, ziemeļrietumu robežu. Pirmo reizi Latvijas robežās šī suga konstatēta 1895. gadā. Kopumā ņemot Sibīrijas mēlziede ir purvu suga ar spēju augt un konkurēt dažādos augšanas apstākļos. Lai gan Sibīrijas mēlziede spēj konkurēt ar gari augošiem augiem un stiebrzālēm, tomēr dzīvotspēja šai populācijai ir maza, jo tieši jaunie īpatņi nespēj izturēt konkurenci un bez pietiekama apgaismojuma iet bojā. Tāpēc ir ļoti svarīgi, lai augi juvenīlajā stadijā izdzīvotu. Veicot Vilkoksona testu, noteikts vai pastāv būtiskas atšķirības Sibīrijas mēlziedes demogrāfiskajiem parametri…