منابع مشابه
Feathers and fins: non-mammalian models for hair cell regeneration.
Death of mechanosensory cells in the inner ear results in two profound disabilities: hearing loss and balance disorders. Although mammals lack the capacity to regenerate hair cells, recent studies in mice and other rodents have offered valuable insight into strategies for stimulating hair cell regeneration in mammals. Investigations of model organisms that retain the ability to form new hair ce...
متن کاملConsiderations in the Conservation of Feathers and Hair, Particularly their Pigments
PB cac / accr 31st annual conference, jasper 2005 Abstract Feathers are amongst the most complex epidermal derivatives found in vertebrates. They have complex branched structures, grow from their bases by a unique mechanism, and come in a wide variety of sizes, shapes, structures, and colours. Not only do feathers impart cover, insulation, waterproofing of the body, contribute to flight, tactil...
متن کاملFrequency of Sodium Valproate-Induced Hair Loss and Curly Hair
Sodium valproate has been widely used by man as an antiepileptic drug. Hair loss and curly hair is a rare side effect of sodium valproate. We have conducted a prospective clinical study in the Department of Neurology in Shafa Hospital, Kerman, Iran for ten years (1994-2004). All 211 epileptic patients in our study were given sodium valproate as a single drug treatment. During the course of ther...
متن کاملUnzipping bird feathers.
The bird feather vane can be separated into two parts by pulling the barbs apart. The original state can be re-established easily by lightly stroking through the feather. Hooklets responsible for holding vane barbs together are not damaged by multiple zipping and unzipping cycles. Because numerous microhooks keep the integrity of the feather, their properties are of great interest for understan...
متن کاملThickness of Feathers
Briefly, a feather is a semigroup derivation diagram with the labels on the edges removed. In this paper, we are concerned with possible definitions for the thickness of a feather. A major open problem is whether the word problem is solvable for semigroup presentations with one defining relation. It is known that word problems for semigroup presentations are solvable if the number of regions in...
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ژورنال
عنوان ژورنال: The American Naturalist
سال: 1897
ISSN: 0003-0147,1537-5323
DOI: 10.1086/276708