منابع مشابه
Is human fecundity declining?
Summary The decreasing trends in fertility rates in many industrialized countries are now so dramatic that they deserve much more scientific attention. Although social and behavioural factors undoubtedly play a major role for these trends, it seems premature, and not based on solid information, to conclude that these trends can be ascribed to social and behavioural changes alone. There is evide...
متن کاملIs human fecundity declining in Western countries?
Since Carlsen and co-workers reported in 1992 that sperm counts have decreased during the second half of the last century in Western societies, there has been widespread anxiety about the adverse effects of environmental pollutants on human fecundity. The Carlsen report was followed by several re-analyses of their data set and by many studies on time trends in sperm quality and on secular trend...
متن کاملPregnancies beyond the human biological fecundity.
The maternal age at first delivery constantly rises in developed countries due to a social trend to postpone the age of parenting. Assisted reproduction technologies do extend the age of fecundity to some limit, but their success rate is inversely related to the patients' age. The major factor limiting human fecundity in the fifth decade of life is the quality of the human oocyte. This problem ...
متن کاملIs Parkinson's disease-related mortality declining?
Reports of trends in mortality from neurodegenerative disease have long relied on death certificates registries and other nationally-administered databanks to determine the state and direction of public health regarding these conditions. In this article, Mylne et. al. turned to the Office of National Statistics, England to ascertain the death statistics for patients with Parkinson's disease (PD...
متن کاملHuman contrast-detail performance with declining contrast.
PURPOSE How do display settings and ambient lighting affect contrast detection thresholds for human observers? Can recalibrating a display for high ambient lighting improve object detection? METHODS Contrast∕detail (CD) threshold detection performance was measured for observers using four color displays with varying overall contrast (e.g., differing maximum luminance and ambient lighting cond...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: International Journal of Andrology
سال: 2006
ISSN: 0105-6263,1365-2605
DOI: 10.1111/j.1365-2605.2005.00573.x