منابع مشابه
Characterization of permineralized kerogen from an Eocene fossil fern
Department of Earth and Space Sciences, Center for the Study of Evolution and the Origin of Life, Institute of Geophysics and Planetary Physics, University of California, Los Angeles, CA 90095-1567, USA Center for the Study of Evolution and the Origin of Life, Institute of Geophysics and Planetary Physics, and NASA Astrobiology Institute, University of California, Los Angeles, CA 90095-1567, US...
متن کاملMolecular features of fossil organic matter in remains of the Lower Cretaceous fern Weichselia reticulata from Przenosza basem
Przenosza (Western Carpathians, Poland) is an important palaeobotanical Cretaceous basement with morphologically well-preserved plant remains. Both the morphology of the macroremains and the microscopic examination of isolated plant cuticles correspond to typical species of coastal swampy palaeoenvironments, mainly the fern Weichselia reticulata (Stokes & Webb). After isolation of the plant rem...
متن کاملNotes on Barnsley Fern
An affine transformation on the plane is a mapping T that preserves collinearity and ratios of distances: given two points A and B, if C is the middle of the segment [A,B] then T (C) is the middle of the segment [T (A), T (B)]. Translations, contractions, expansions, reflections, rotations, are all particular cases of affine transformations. In general, an affine transformation T maps a point (...
متن کاملThe fern sporangium: a unique catapult.
Various plants and fungi have evolved ingenious devices to disperse their spores. One such mechanism is the cavitation-triggered catapult of fern sporangia. The spherical sporangia enclosing the spores are equipped with a row of 12 to 13 specialized cells, the annulus. When dehydrating, these cells induce a dramatic change of curvature in the sporangium, which is released abruptly after the cav...
متن کاملUnusual Flavanones from a Rare American Fern
Notholaena fendleri, Polypodiaceae, Farinose Exudate, Novel Flavanone Notholaena fendleri is a rare representative of the genus, growing mainly in Colorado/USA. The white farinose exudate on the lower surface of its pinnules is composed partly of waxy material and partly of flavonoid aglycones. The flavonoid moiety consists mainly of methyl derivatives of the flavanones naringenin and eriodicty...
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ژورنال
عنوان ژورنال: Annals of Botany
سال: 1910
ISSN: 1095-8290,0305-7364
DOI: 10.1093/oxfordjournals.aob.a089299