منابع مشابه
A New Triterpene Acid from the Fern Notholaena grayi
Previous studies on several specimens of N. grayi Davenp. have revealed, in the white frond exudate, flavonoid aglycones which form a con stant pattern [1], It was indicated later, in a tabu lated survey of 23 specimens of N. grayi, that a fur ther unknown flavonoid occurs in every species, in small or in trace amount [2], When bulk material, collected in Arizona, was processed for the isola...
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Many adolescents in Sweden speak Swedish with what appears to be a foreign accent. Whereas some people perceive their way of speaking Swedish as the result of imperfect or incomplete learning of Swedish, others argue that they speak a new variety of Swedish. In this paper, several arguments of anecdotal character are tested experimentally in order to investigate whether or not a new variety of ...
متن کاملNovel Flavonoids from the Fern Notholaena sulphurea
T he m ajo r constituent of the yellow frond exudate of the fern Notholaena sulphurea was iden tified by spectroscopic m ethods as 3 ,5 ,2 '-trihydroxy-7-m ethoxy-8-acetoxy flavone and its struc tu re was confirm ed by synthesis. This novel natural flavonoid was also de tected in the frond exudate of five o ther Notholaena species. In the yellow form of N. sulphurea, the rare 5 ,2 'dihydroxy-7,...
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Four new bibenzyl derivatives were isolated, together with other known bibenzyls, by bioassay-guided fractionation of a CHCl₃-MeOH extract of Notholaena nivea Desv. (Pteridaceae) aerial parts. The structures were elucidated by NMR, ESIMS and other spectral analyses. Their antioxidative effects towards superoxide, lipidic peroxidation and the 2,2'-azino-bis-3-ethilbenzothiazoline-6-sulfonic acid...
متن کاملA dihydroflavonol with taxonomic significance from the fern Notholaena sulphurea.
A new flavonoid, 2,3-trans-5,2'-dihydroxy-7,8-dimethoxy-dihydroflavonol-3-O-acetate, was isolated from the farinose coating on the lower leave surface of the fern, Notholaena sulphurea. The 2,3-cis diastereoisomer was isolated as a co-constituent. This novel acylated flavonoid is characteristic for the chemotype of N. sulphurea exhibiting yellow frond exudate. Its orrurrence underlines the affi...
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ژورنال
عنوان ژورنال: American Fern Journal
سال: 1946
ISSN: 0002-8444
DOI: 10.2307/1544838