منابع مشابه
“the effect of risk aversion on the demand for life insurance: the case of iranian life insurance market”
abstract: about 60% of total premium of insurance industry is pertained?to life policies in the world; while the life insurance total premium in iran is less than 6% of total premium in insurance industry in 2008 (sigma, no 3/2009). among the reasons that discourage the life insurance industry is the problem of adverse selection. adverse selection theory describes a situation where the inf...
15 صفحه اولthe tragedy of modern man in arthur millers world
what miller wants is a theatre of heightened consciousness. he speaks of two passions in a man, the passion to "feel" and the passion "know". he belives that we can have more of the latter. he says: drama is akin to the other inventions of man in that it ought to help us know more and not merely to spend our feelings. the writing of the crucible shows us that he is trying to give more heightene...
15 صفحه اولThe RNA World as a Model System to Study the Origin of Life
Understanding how life arose is a fundamental problem of biology. Much progress has been made by adopting a synthetic and mechanistic perspective on originating life. We present a current view of the biochemistry of the origin of life, focusing on issues surrounding the emergence of an RNA World in which RNA dominated informational and functional roles. There is cause for optimism on this diffi...
متن کاملThe Origin and Early Evolution of Life: Prebiotic Chemistry, the Pre-RNA World, and Time
Antonio Lazcano* and Stanley L. Miller† models incorporate high partial pressures of CO2 to raise the temperature of the Earth by a greenhouse effect *Departamento de Biologı́a Facultad de Ciencias and thus prevent the complete freezing of the oceans (Kasting, 1993). However, a frozen Earth has some adUniversidad Nacional Autónoma de Mexico Apartado Postal 70-407 vantages for prebiotic chemistry...
متن کاملWhat Does “the RNA World” Mean to “the Origin of Life”?
Corresponding to life's two distinct aspects: Darwinian evolution and self-sustainment, the origin of life should also split into two issues: the origin of Darwinian evolution and the arising of self-sustainment. Because the "self-sustainment" we concern about life should be the self-sustainment of a relevant system that is "defined" by its genetic information, the self-sustainment could not ha...
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ژورنال
عنوان ژورنال: Nature
سال: 1986
ISSN: 0028-0836,1476-4687
DOI: 10.1038/319618a0