Titlebook: Origin of Life; Proceedings of the T Yecheskel Wolman Conference proceedings 1981 D. Reidel Publishing Company, Dordrecht, Holland 1981 Cam

GALL

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DEFER

tenuous

On the Origin of Organic Molecules in Interstellar Space and Some of its Consequences,s cannot possibly explain the observed amounts of complex organic molecules. They are probably formed in interstellar clouds, either free in space or on the surface of grains. This opens the possibility that planets (also the earth) moving through such clouds may have collected appreciable amounts o

枕墊

一回合

Nature and Origin of Organic Molecules in Comets,lar grains that have later accreted into comets, or they represent the “snows” that condensed onto silicate grains during the cooling phase of the presolar nebula. Even if one does not accept the speculations of Hoyle and Wickramashinghe (1977), the fact that prebiotic chemistry could have been brou

breadth

Liquid Water on a Planet over Cosmic Periods,se effect of the planet, if not properly compensated, can elliminate liquid water from the surface of the planet either through runaway glaciation or through a runaway greenhouse effect. Since active life, at least as we know it, requires the presence of liquid water, and since its evolution to high

男生戴手銬

割讓

Nitrogen Compounds in Carbonaceous Meteorites: A Reassessment,laboratory. The positive identification of the pyrimidine uracil and the purines adenine, guanine, xanthine and hypoxanthine is reported. The .-triazines melamine, ammeline, ammelide and cyanuric acid could not be detected in any meteorite, above a detection limit of 50 ppb.

發(fā)誓放棄

comely