Survival of the fattest.
نویسنده
چکیده
LIKE most large universities, the University of Arizona is a virtual city: 37,000 students and nearly 14,000 employees on a sprawling campus in Tucson of 174 buildings and 11,000 parking spots. Also like most of the country's colleges and universities, it is not particularly selective. Arizona admits 83 percent of its applicants, although most graduated in the top half of their high school class. They sit in numbing lecture halls with 500 classmates; the only instructor they may know is a teaching assistant, and they are, for all intents and purposes, anonymous.
منابع مشابه
Survival of the fattest
Experiments on the social amoeba Dictyostelium discoideum show that the origins of lineage bias in this system lie in the nutritional history of individual cells. Clues to the molecular basis for this process suggest similar forces may be at work in early mammalian development.
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Survival of the fattest: fat babies were the key to evolution of the large human brain.
In the past 2 million years, the hominid lineage leading to modern humans evolved significantly larger and more sophisticated brains than other primates. We propose that the modern human brain was a product of having first evolved fat babies. Hence, the fattest (infants) became, mentally, the fittest adults. Human babies have brains and body fat each contributing to 11-14% of body weight, a sit...
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The circumstances of human brain evolution are of central importance to accounting for human origins, yet are still poorly understood. Human evolution is usually portrayed as having occurred in a hot, dry climate in East Africa where the earliest human ancestors became bipedal and evolved tool-making skills and language while struggling to survive in a wooded or savannah environment. At least t...
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Leptin resistance is a major cause of obesity in humans. A major component of this resistance is likely an impaired transport of leptin across the blood-brain barrier (BBB). The fattest subgroup of otherwise normal 12-mo-old CD-1 mice have severely impaired transport of leptin across the BBB. However, it is unknown whether these mice are born with a BBB impairment or acquire it with aging and o...
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ورودعنوان ژورنال:
- Journal of the American Geriatrics Society
دوره 58 7 شماره
صفحات -
تاریخ انتشار 2010