منابع مشابه
Nanotechnologists Seek Biological Niches
In late August, behind closed doors at the austere National Academy of Sciences in Washington D.C., Samuel Stupp, a materials scientist and director of the Institute for BioNanotech-nology in Medicine at Northwestern University, showed a video clip for a committee evaluating the United States' billion-dollar-a-year National Nanotechnology Program. " Everyone was so quiet watching this movie. It...
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Organisms are machines designed by their evolution to play a certain role. This role, together with the environment within which it is played, is called the organism's niche 1. For example, most cats — tigers, leopards, mountain lions — play the role of solitary hunters; wolves and wild dogs are social hunters; antelope are social grazers; and so on. The niche defines the patterns of adaptive b...
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Stem cells are characterized by their dual ability to reproduce themselves (self-renew) and specialize (differentiate), yielding a plethora of daughter cells that maintain and regenerate tissues. In contrast to their embryonic counterparts, adult stem cells retain their unique functions only if they are in intimate contact with an instructive microenvironment, termed stem cell niche. In these n...
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ژورنال
عنوان ژورنال: Nature
سال: 2003
ISSN: 0028-0836,1476-4687
DOI: 10.1038/425778a