منابع مشابه
Fish-Scales: Representing Fuzzy Manifolds
We address the problem of automatically reconstructing m-manifolds of unknown topology from unorganized points in metric p-spaces obtained from a noisy measurement process. The point set is first approximated by a collection of oriented primitive fuzzy sets over a range of resolutions. Hierarchical multiresolution representation is then computed based on the relation of relative containment def...
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Recent surge in the development of superhydrophobic/superoleophobic surfaces has been motivated by surfaces like fish scales that have hierarchical structures, which are believed to promote water or oil repellency. In this work, we show that the under-water oil repellency of fish scales is entirely due to the mucus layer formation as part of its defense mechanism, which produces unprecedented c...
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Hybrid matings between the sexual species Poeciliopsis monacha and Poeciliopsis lucida produced a series of diploid all-female lineages of P. monacha-lucida that inhabit the Río Fuerte of northwestern Mexico. Restriction site analyses of mitochondrial DNA (mtDNA) clearly revealed that P. monacha was the maternal ancestor of these hybrids. The high level of mtDNA diversity in P. monacha was mirr...
متن کاملScales of fish arise from mesoderm
The trunk of fish is covered by a large variety of morphologically and structurally diverse skeletal elements, such as scales, scutes and bony plates [1]. These elements are formed from intramembraneous ossifications and are part of the integumentary skeleton [2]. Histological and developmental similarities with neural crest-derived teeth in fossil and extant vertebrates, have led to the widely...
متن کاملOrigins of Human Communication
Over the last years an ever-increasing number of works has turned attention to the topic of the human language evolution from several points of view (e.g., Burling, 2005; Corballis, 2002; Christiansen & Chater, 2008; Christiansen & Kirby, 2003; Deacon, 1997; Dunbar, 1996; Fitch, 2010; Knight et al., 2000; Pinker & Bloom, 1990; Tallerman, 2005; Wildgen, 2004). The common thread connecting these ...
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ژورنال
عنوان ژورنال: Nature
سال: 1991
ISSN: 0028-0836,1476-4687
DOI: 10.1038/349112a0