Zobrazeno 1 - 10
of 14
pro vyhledávání: '"Volker H. Dietz"'
Publikováno v:
Phytochemistry. 31:347-349
Fronds of the fernLophosoria quadripinnata exhibit a thin waxy coating on their lower surface. Five major components of this lipophilic material have been identified by spectroscopic methods as hopane type triterpenes, one of which is a novel natural
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::2bdb4eb75fdf3879f61c000a21fb82e7
https://doi.org/10.1016/0031-9422(91)83074-u
https://doi.org/10.1016/0031-9422(91)83074-u
Autor:
Dervilla M.X. Donnelly, Volker H. Dietz, Otto Seligmann, Mary J. Meegan, Mohan V. Chari, Hildebert Wagner, Eckhard Wollenweber, Brandan O'Donnell
Publikováno v:
Tetrahedron Letters. 20:4269-4272
From the fern Pityrogramma calomelanos a new Pigment has been isolated and structurally elucidated as a 8- or 6-dihydrocinnamoyl-5,7-dihydroxy-4-phenyl-2H-1-benzopyran-2-one mainly by spectroscopic methods and by comparison with the synthesized monom
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::0731fdda883a22819cf6557929da4d22
https://doi.org/10.1016/s0040-4039(01)86563-1
https://doi.org/10.1016/s0040-4039(01)86563-1
Publikováno v:
Zeitschrift für Pflanzenphysiologie. 94:241-246
Summary Pityrogramma pallida , an endemic silver fern of California, is characterised by very rich production of a white farinose exudate on its fronds. Such material normally consists of methoxy-flavonoids, occuring as aglycones. The present fern, h
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::7fafaae79aced5e1004a58fccc1e5f5e
https://doi.org/10.1016/s0044-328x(79)80163-4
https://doi.org/10.1016/s0044-328x(79)80163-4
Publikováno v:
Zeitschrift für Naturforschung C. 35:36-40
Fronds of the neotropical fern Pityrogram m a trifoliata produce a farinose exudate which consists mainly of a dihydrochalcone. The structure of som e minor constituents has been elucidated by spectroscopic m ethods. They are shown to be representati
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::0c4cc01208c2ee2d5fc9675b0dfa39e8
https://doi.org/10.1515/znc-1980-1-208
https://doi.org/10.1515/znc-1980-1-208
Autor:
Eckhard Wollenweber, Volker H. Dietz
Publikováno v:
Phytochemistry. 20:869-932
Flavonoids are widely present in plants as water-soluble glycosides but the lipophilic free aglycones are far less abundant. The 462 flavonoids reported so far to be present in the free state and their plant sources are listed. Evaluation of these da
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::bd253d41a551e3dbdd5beeb812d096d0
https://doi.org/10.1016/0031-9422(81)83001-4
https://doi.org/10.1016/0031-9422(81)83001-4
Autor:
Volker H. Dietz, Kenneth R. Markham, Eckhard Wollenweber, Christian Vilain, Gerhard Schilling
Publikováno v:
Zeitschrift für Naturforschung C. 40:317-320
Isoceroptene, a polyphenol isolated in trace amount from the farinose frond exudate of Pityrogramma triangularis, is shown by spectroscopic means to possess the structure of one of the two possible “flavanone” isomers formed by ring closure of
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::c5c5a2056713f431c26d9a7a4c7b86cd
https://doi.org/10.1515/znc-1985-5-606
https://doi.org/10.1515/znc-1985-5-606
Publikováno v:
Zeitschrift für Naturforschung C. 35:685-690
The white farinose exudate on the fronds of Cheilanthes argentea contains a series of flavanones as minor constituents. These were identified by spectroscopic methods as: 5,4′-diOH,6,7-diOMe flavanone and its 4′-OMe derivative, 5,4′-diOH,7,8-di
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::d0b5a2523380514a11a16204825eeb5b
https://doi.org/10.1515/znc-1980-9-1003
https://doi.org/10.1515/znc-1980-9-1003
Autor:
Volker H. Dietz, Eckhard Wollenweber
Publikováno v:
Biochemical Systematics and Ecology. 8:21-33
Most species of the fern genus Pityrogramma show a farinose indument caused by a deposit of exuded flavonoid aglycones. Some 220 samples, comprising 14 species, have been studied for the chemical composition of their farinas. Flavones, flavonols and
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::a947143bc974a0fcbe2660008166cd77
https://doi.org/10.1016/0305-1978(80)90021-6
https://doi.org/10.1016/0305-1978(80)90021-6
Publikováno v:
Phytochemistry. 24:965-971
More than 20 flavonoid aglycones were identified from the frond exudate of various collections of Pityrogramma triangularis . Ten of them are novel natural products; most of the others are rare flavonoids. They are substituted at C-8; many are C -met
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::1be5d014bc5732032789d3f0f25bfc9a
https://doi.org/10.1016/s0031-9422(00)83163-5
https://doi.org/10.1016/s0031-9422(00)83163-5
Publikováno v:
Phytochemistry. 19:2043-2045
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::6b1455e8fab48cb69c6da96cd819a01f
https://doi.org/10.1016/0031-9422(80)83040-8
https://doi.org/10.1016/0031-9422(80)83040-8