نتایج جستجو برای: barn
تعداد نتایج: 2754 فیلتر نتایج به سال:
In the last two decades, the barn owl, a nocturnal predator with accurate visual and auditory capabilities, has become a common experimental system for neuroscientists investigating the biological substrate of spatial localization and orienting behavior. As a result, much data are now available regarding the anatomy and physiology of many neural structures involved in such processes. On the bas...
Swine confinement workers are exposed to various contaminants. These agents can cause airway inflammation and bronchoconstriction. This study was undertaken to evaluate if the bronchoconstrictive effects of swine barn air and settled dust are mediated by endotoxin, and if these effects are directly mediated on airway smooth muscles. Mouse tracheas where isolated and mounted isometrically in org...
Computer simulation can provide reliable information about fluid flow behavior, including ventilation, in animal production systems. The ventilation system is essential for thermal conditioning, as it favors comfort and enhance productivity. objective of this study was to develop validate a CFD (Computational Fluid Dynamics) model analyze the compost barn. A mesh with greater refinement used ne...
Photoperiodic responses are major factors entraining circannual life-cycles, functioning to adaptively synchronize annual routines to seasonal fluctuations in ecological conditions. Photoperiodism in physiology and behaviour is enforced by genes, including the vertebrate Clock orthologues, which are associated, for example, with phenology of migration in fish and breeding in birds. However, the...
Population studies assume that individuals belonging to a study population are homogeneous for natal and breeding origin, although this assumption is rarely tested. We tested for heterogeneity in stable-isotope profiles (delta15N, delta13C, deltaD) of feathers grown in the African winter quarters from a Danish breeding population of adult barn swallows, Hirundo rustica. Deuterium isotope values...
Following over 20 years of research on the climatic effects on biodiversity we now have strong evidence that climate change affects phenology, fitness, and distribution ranges of different taxa, including birds. Bird phenology likely responds to changes in local weather. It is also affected by climatic year-to-year variations on larger scales. Although such scale-related effects are common in e...
Den här bloggen handlar om att skaffa barn. Vi är tre röster av många, ungdomar som närmar oss åldern då bisatsen ”när du blir stor” försvinner från frågan ”vill ha barn?”. Idéen till kom ifrån många och långa diskussioner på ämnet där vi alla något sätt känt utpekade den tänker fel. Vad det med stressar oss, oavsett vad vårt svar är? Tillsammans bestämde för finns ett behov visa upp de olika s...
the barn owl, tyto alba (scopoli, 1769), occurs worldwide and shows a considerable amount of morphological and geographical variation, leading to the recognition of many subspecies around the world. yet comprehensive study on this species needs to be done. data from mitochondrial gene (cytb) with 620bp length is analyzed for 30 individuals around the world. maximum likelihood (ml), maximum pars...
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