منابع مشابه
Origins of Neotropical Leafy Hepaticae
The neotropical hepatic flora, predominantly constituted by members of the Jungermanniales and Metzgeriales, includes a disproportionate number of genera which are endemic (over 38) and a number which evidently originated here but have shown slight and in a geological sense, modern dispersal by solitary species. Endemism is confined almost to the Jungermanniales; it is to a large degree of a un...
متن کاملStudies of Spermatogenesis in the Hepaticae
An ultrastructural study of late-stage androgonial cells of Blasia pusilla, a thallose liverwort, showed the nearly spherical nuclei often lying close or appressed to the cell walls. In some cells the two membranes comprising the nuclear envelope separated, the inner membrane continuing intact as a limiting boundary of the nucleus and the membrane on the outer, cytoplasmic side recurving away f...
متن کاملFlavonoids from Some Frullania Species (Hepaticae)*
Z. Naturforsch. 50c, 345-352 (1995); received January 27/February 20, 1995 Liverworts, Frullania, Flavone Aglycones, Acylated Flavone Glycosides, Chemotaxonomy From Frullania teneriffae 5 known flavone aglycones and 6 flavone glycosides were iso lated, among them the new 6-OH-luteolin-6-0-ß-D-glucoside-7-0-ß-D-glueoside-6'"-(3-hydroxy-3-methylglutaroylester). F. cesatiana contains 2 flavone-di...
متن کاملthe u.s. policy in central asia and its impact on the colored revolutions in the region (the case study of tulip revolution in kyrgyzstan)
چکیده ندارد.
15 صفحه اولLeafy Spanning
We prove that the d-dimensional hypercube, Hd, with n = 2 d vertices, contains a spanning tree with at least 1 ? 2 log 2 n ? o 1 log n n + 2 leaves. This improves upon the bound implied by a more general result on spanning trees in graphs with minimum degree , which gives 1 ? O(log log n) log 2 n n as a lower bound on the maximum number of leaves in spanning trees of n-vertex hypercubes.
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ژورنال
عنوان ژورنال: Annals of Botany
سال: 1912
ISSN: 1095-8290,0305-7364
DOI: 10.1093/oxfordjournals.aob.a089377