منابع مشابه
Young children's interest in live animals.
Animals are important stimuli for humans, and for children in particular. In three experiments, we explored children's affinity for animals. In Experiment 1, 11- to 40-month-old children were presented with a free-play session in which they were encouraged to interact with several interesting toys and two live animals - a fish and a hamster. Experiment 2 used the same methodology with 18- to 36...
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We survey several types of mathematical models that keep track of age distributions in a population, or follow some aspects of aging, such as loss of replicative potential of stem cells. The properties of a class of linear models of this type are discussed and compared. We illustrate the applicability of such models with a simple example based on hypothetical stem cell dynamics developed to add...
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Americans are living longer and longer, with many more people in the present day living to 80, 90, or even 100. However, these golden years are being tainted for many older adults by the dark specter of depression. Studies have shown that the aged are more susceptible to depression, with up to 9.1% of older adults having depressive disorders in 2010. The medical system habitually undertreats or...
متن کاملLive fast, die young, and win the sperm competition.
Consider the two mammalian species shown in Fig. 1. The brown antechinus (Antechinus stuartii) has a fast life cycle and “big bang” reproduction, with males that mate for only a single breeding season in 1 y and then die a programmed death associated with lethal immune system collapse (1). The other mammalian species (Homo sapiens) has a long life during which males can mate during up to or bey...
متن کاملBig mice die young but large animals live longer
It has been known for millennia that large animals live longer, inspiring numerous theories of aging. For example, elephants and humans live longer than mice, which in turn live longer than worms and flies. The correlation is not perfect, with many explainable exceptions, but it is still obvious. In contrast, within each species (e.g., mice and some other mammals) small body size is associated ...
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ژورنال
عنوان ژورنال: American Journal of Public Health and the Nations Health
سال: 1944
ISSN: 0002-9572
DOI: 10.2105/ajph.34.12.1287-c