Search results for "testes"

Endocrine correlates of the breeding asynchrony between two Corsican populations of Blue tits (Parus caeruleus)

2004

International audience; Analyses of the development of the reproductive system in seasonally breeding birds in the framework of long-term ecological studies are rare. Here, we present the Wrst results of such a study in two Corsican populations of a European passerine bird, the blue tit (Parus caeruleus). The two study populations occupy diVerent oak habitats and are separated by only 25km. Despite their close proximity, they show a one-month diVerence in onset of egg laying, even after controlling for altitude. This micro-geographic diVerence in breeding date appears adaptive because both study populations raise chicks when food is most plentiful. In our study, males reached their maximum …

SPANX-B and SPANX-C (Xq27 region) gene dosage analysis in Down’s syndrome subjects with undescended testes

2009

Down’s syndrome (DS) is one of the most common numer- ical chromosomal aberrations, usually caused by trisomy of chromosome 21, and is frequently complicated with congen- ital heart defects, duodenal obs truction and other conditions including undescended testis (UDT) (Fonkalsrud 1970). The incidence of undescended testes in DS was reported to be 6.52% (Chew and Hutson 2004) while the incidence of UDT in the first year is approximately 0.2%–0.8% in the nor- mal population (Benson et al . 1991; Ichiyanagi et al . 1998). Rapley et al . (2000) provided evidence for a testicular germ- cell tumours (TGCT) predisposition locus at Xq27; the au- thors obtained an hlod score of 4.7 from families wit…

Investigations on gonadal maturation in Pagellus acarne (Pisces, Sparidae) in the strait of Messina (Sicily)

2000

Relazione tra disfunzione erettile, livelli di testosterone e funzione endoteliale in pazienti a rischio cardiovascolare intermedio secondo le stime …

2014

Scopo del lavoro Il ruolo dei livelli di testosterone plasmatico e della disfunzione erettile come marcatori precoci di disfunzione endoteliale non è ben definito. Pertanto, abbiamo cercato di analizzare la relazione tra testosterone plasmatico e disfunzione erettile, in rapporto alla funzione endoteliale. Materiali e metodi Abbiamo quindi arruolato 802 pazienti in prevenzione primaria, con una stima di rischio cardiovascolare (CV) intermedio secondo la carta del rischio di Framingham, di età compresa fra 40 e 80 anni, che si sono sottoposti all’esame ecografico della dilatazione flusso mediata dell’arteria brachiale destra, alla valutazione della disfunzione erettile attraverso il question…

Simultaneous pituitary–gonadal recrudescence in two Corsican populations of male blue tits with asynchronous breeding dates

2006

Animal populations living in geographically variable environments respond to different selection pressures. The adaptive character of the responses to environmental information determines the degree of synchrony of the breeding period with local optimal conditions. An example is provided by two populations of Mediterranean blue tits (Parus caeruleus) in Corsica, breeding in different habitats, with a 1-month difference in the onset of egg laying. This difference in the onset of lay is supposed to be adaptive because, although chicks from both populations are raised mostly on caterpillars, the timing of the appearance of caterpillars is earlier for populations of tits associated with deciduo…

Experiencia sobre la utilización de un mix de metodologías docentes en la educación universitaria de la contabilidad

2012

En este trabajo se analiza la introducción de nuevas metodologías docentes a título experimental en un curso de contabilidad financiera. Las nuevas técnicas empleadas en clase han sido de varios tipos: mapas conceptuales, crucigramas, técnica del "puzzle" o aprendizaje cooperativo y test on-line, entre otras. Concretamente, se analiza la mejora en el rendimiento de los estudiantes mediante la comparación con resultados de otros años. Así mismo, se estudia el grado de satisfacción de los estudiantes con las nuevas herramientas docentes empleadas. Se analiza si mejora el nivel de motivación por una mayor comprensión de los contenidos, por un mayor número de horas de estudio a lo largo del per…

Data from: Testis asymmetry in birds: the influences of sexual and natural selection

2014

Gonad size and shape asymmetries are particularly common in birds. Although some obvious size and shape differences between the left and right testes in birds were first documented more than a century ago, little is known about what influences the variation across species in either the degree or the direction of these asymmetries. Here we show that a left bias in size is the most likely ancestral state in most orders and families, and that there is a weak but significant negative relation between the degree of size and shape asymmetries. In extant species, testis size and shape symmetries increase with the degree of sperm competition (relative testes mass), but those relations are significa…