منابع مشابه
Sexual selection and tail streamers in the barn swallow
A. P. MÖller1*, A. Barbosa1, J. J. Cuervo2, F. de Lope3, S. Merino1 and N. Saino4 1Laboratoire d'Ecologie, CNRSURA 258, Universitë Pierre et Marie Curie, Bat. A, Septie© me ëtage, 7 quai St Bernard, Case 237, F-75252 Paris Cedex 05, France 2Estaciön Biolögica de Do·ana, Pabellön del Perü, Avenida Mar|̈a Luisa s/n, E-41013 Sevilla, Spain 3Departamento de Ciencias Morfologicas y Biologia Celular y...
متن کاملA Black Hole Farey Tail
We derive an exact expression for the Fourier coefficients of elliptic genera on Calabi-Yau manifolds which is well-suited to studying the AdS/CFT correspondence on AdS3 × S. The expression also elucidates an SL(2,ZZ) invariant phase diagram for the D1/D5 system involving deconfining transitions in the k → ∞ limit.
متن کاملMRI of the Swallow Tail Sign: A Useful Marker in the Diagnosis of Lewy Body Dementia?
BACKGROUND AND PURPOSE There are, to date, no MR imaging diagnostic markers for Lewy body dementia. Nigrosome 1, containing dopaminergic cells, in the substantia nigra pars compacta is hyperintense on SWI and has been called the swallow tail sign, disappearing with Parkinson disease. We aimed to study the swallow tail sign and its clinical applicability in Lewy body dementia and hypothesized th...
متن کاملHaematocrit correlates with tail ornament size in three populations of the Barn Swallow (Hirundo rustica)
Advertisement models of sexual selection propose that exaggerated male secondary sexual characters could reliably signal male health and vigour by having the function of ‘handicaps’, i.e. characters that impose a cost to their bearer (Zahavi 1975, 1977; Heywood 1989; Grafen 1990). A commonly cited example of such characters is the ornamental tails of several bird species (Darwin 1871; Fisher 19...
متن کاملUltra high-field SWI of the substantia nigra at 7T: reliability and consistency of the swallow-tail sign
BACKGROUND The loss of the swallow-tail sign of the substantia nigra has been proposed for diagnosis of Parkinson's disease. Aim was to evaluate, if the sign occurs consistently in healthy subjects and if it can be reliably detected with high-resolution 7T susceptibility weighted imaging (SWI). METHODS Thirteen healthy adults received SWI at 7T. 3 neuroradiologists, who were blinded to patien...
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ژورنال
عنوان ژورنال: Blue Jay
سال: 1954
ISSN: 2562-5667,0006-5099
DOI: 10.29173/bluejay1437