منابع مشابه
Fractal terraces in MBE growth
MBE growth on high symmetry surfaces depends to some extent on the shape of the terraces which form the embryos of each new atomic layer. The conditions for formation of compact or fractal terraces are discussed in two limits: large terraces, to which a continuous description applies, and small terraces, which require that the discrete nature of matter be taken into account. In both cases it is...
متن کاملTerraces in phylogenetic tree space.
A key step in assembling the tree of life is the construction of species-rich phylogenies from multilocus--but often incomplete--sequence data sets. We describe previously unknown structure in the landscape of solutions to the tree reconstruction problem, comprising sometimes vast "terraces" of trees with identical quality, arranged on islands of phylogenetically similar trees. Phylogenetic amb...
متن کاملCranio-facial Dysostosis in a Dorset Family.
Crouzon (1912), whose name has been given to the combination of developmental anomalies which he described as hereditary cranio-facial dysostosis, presented his first two cases to the Societe Medicale des H6pitals de Paris. The patients, a mother aged 29 years and her son aged 21 years, had a malformation of the cranial vault consisting of protrusion in the region of the bregma, widening transv...
متن کاملCongenital hypotrichosis in Poll Dorset sheep.
Partial or complete absence of hair has been reported as a congenital defect in all domestic animal species eager and Scott 1985), but thereappear tobefew reports of theconditioninsheep (Lofstedt 1983). This paper reports congenital hypotrichosis and follicular dysplasia in sheep from a Poll Dorset stud flock. In October 1989.2 of about 200 weaners were presented with bald faces, ears and lower...
متن کاملAn Extension Theorem for Terraces
We generalise an extension theorem for terraces for abelian groups to apply to nonabelian groups with a central subgroup isomorphic to the Klein 4-group V . We also give terraces for three of the non-abelian groups of order a multiple of 8 that have a cyclic subgroup of index 2 that may be used in the extension theorem. These results imply the existence of terraces for many groups that were not...
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ژورنال
عنوان ژورنال: Geological Magazine
سال: 1883
ISSN: 0016-7568,1469-5081
DOI: 10.1017/s0016756800164210