منابع مشابه
Catastrophe under pressure
n page 1163, Gerhardt et al. present a mechanism to explain the function of VEGF in angiogenesis. Their findings implicate a specialized cell at the tips of vessels in guiding the growth of new sprouts, with cell mass provided by the division of different cells that lie further back. The authors examined angiogenesis in mice retina. Retinal O Tip cell (green) filopodia follow VEGF-A–expressing ...
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Organisms are often more likely to exchange genetic information with others that are similar to themselves. One of the most widely accepted mechanisms of RNA virus recombination requires substantial sequence similarity between the parental RNAs and is termed similarity-essential recombination. This mechanism may be considered analogous to assortative mating, an important form of non-random mati...
متن کاملCatastrophe Aversion and Risk Equity under Dependent Risks
Catastrophe aversion and risk equity are important concepts in both risk management theory and practice. Keeney (1980) was the first to formally define these concepts. He demonstrated that the two concepts are always in conflict. Yet this result is based on the assumption that individual risks are independent and has thus limited relevance for real world catastrophic events. We extend Keeney’s ...
متن کاملUnder pressure
The movement of water by osmosis causes pressure differences that drive the transport of sugars over long distances in plants.
متن کاملUnder pressure.
Abstract A variety of public campaigns, including the “Just Say No” campaign of the 1980s and 1990s that encouraged teenagers to “Just Say No to Drugs”, are based on the premise that teenagers are very susceptible to peer influences. Despite this, very little is known about the effect of school peers on the long-run outcomes of teenagers. This is primarily due to two factors: the absence of inf...
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ژورنال
عنوان ژورنال: Journal of Cell Biology
سال: 2003
ISSN: 1540-8140,0021-9525
DOI: 10.1083/jcb1616iti2