نتایج جستجو برای: demography
تعداد نتایج: 10008 فیلتر نتایج به سال:
This is a truly interesting and well written book. While many historical works on venereal disease focus on one particular kind of disease, in this volume public debates on the subject play a central role, and therefore we learn not only about syphilis, but also, for instance, about herpes genitalis and AIDS. This is not surprising, because the author's aim was to write a sociological study in ...
Controlling for background demographic effects is important for accurately identifying loci that have recently undergone positive selection. To date, the effects of demography have not yet been explicitly considered when identifying loci under selection during dog domestication. To investigate positive selection on the dog lineage early in the domestication, we examined patterns of polymorphism...
Demography impacts the observed standing level of genetic diversity present in populations. Distinguishing the relative impacts of demography from selection requires a baseline of expressed gene variation in naturally occurring populations. Six nuclear genes were sequenced to estimate the patterns and levels of genetic diversity in natural Arabidopsis lyrata subsp. petraea populations that diff...
Introduction: Acne vulgaris is a frequently encountered skin disease in daily practice. Its clinico-epidemiological status was evaluated in this study.Methods: Four hundred patients were studied by record-based observation for 2 years in the Acne Clinic of a tertiary care hospital.Results: This study revealed a male preponderance (53%) with a higher p...
Harvesting may be a potent driver of demographic change and contemporary evolution, which both may have great impacts on animal populations. Research has focused on changes in phenotypic traits that are easily quantifiable and for which time series exist, such as size, age, sex, or gonad size, whereas potential changes in behavioural traits have been under-studied. Here, we analyse potential dr...
The reproductive value (see Fisher 1930) arises as part of the shadow price of the population in a large class of age-structured optimal control models. 1 Institute of Mathematical Methods in Economics (Research Unit on Operations Research and Control Systems), Vienna University of Technology, Argentinierst. 8, A-1040 Vienna, Austria. E-mail: [email protected]. ac.at and Vienna Institute of Dem...
This article opens with a review of the main trends in family-related behaviour, i.e. fertility decline and changes in fertility patterns, a decreasing propensity to marry, postponement of marriage, and a slowly increasing frequency of divorces and separations. The analysis takes into account urban and rural differences. We then aim to identify the main determinants of family changes within the...
Despite recent advances in biodemography and metapopulation ecology, we still have limited understanding of how local demographic parameters influence short- and long-term metapopulation dynamics. We used long-term data from 17 local populations, along with the recently developed methods of matrix metapopulation modeling and transient sensitivity analysis, to investigate the influence of local ...
Governments around the world must rapidly mobilize and make difficult policy decisions to mitigate the coronavirus disease 2019 (COVID-19) pandemic. Because deaths have been concentrated at older ages, we highlight the important role of demography, particularly, how the age structure of a population may help explain differences in fatality rates across countries and how transmission unfolds. We...
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