Titlebook: Cosmochemistry and the Origin of Life; Proceedings of the N Cyril Ponnamperuma Conference proceedings 1983 D. Reidel Publishing Company, Do

貪婪地吃

易碎

Synthesis of the Chemical Elements,to develop a self-consistent explanation of these processes, extensive information from many diverse fields of science is required. First, one must know the characteristic abundances of the elements and their isotopes in the universe, for it is these values that any successful theory of nucleosynthe

過于平凡

The Largest Molecules in Space: Interstellar Dust,lly contains some 10. atoms of oxygen, carbon and nitrogen in an amorphous molecular mixture. As a result of chemical processing of the particles by ultraviolet photons over times spanning ~ 10.-10. years a substantial portion of each dust grain is converted into complex organic molecules whose maxi

arsenal

Comets, Interstellar Molecules, and the Origin of Life,ication for a joint treatment lies in the possibility that comets may consist of a frozen matrix of interstellar volatiles and grains, formed during the early stages of the collapse of the molecular cloud which ultimately produced the Sun and planets. These topics may in turn be related to the origi

Override

Impact of Solar System Exploration on Theories of Chemical Evolution and the Origin of Life,ions to Mercury, Venus, the Moon, Mars, Jupiter, Saturn, and Titan are reviewed and implications for prebiotic chemistry are discussed. Among the major conclusions are: prebiotic chemistry is widespread throughout the solar system and universe; chemical evolution and the origin of life are intimatel

北京人起源

,The Chemical Composition and Climatology of the Earth’s Early Atmosphere, climate which is revealed seems to be a direct result of the existence of a global hydrosphere. Analysis of the chemical and physical processes operating within the Earth’s atmosphere--surface environment around the critical period of the origin and earliest evolution of life suggests that the like

indubitable

The Dating of the Earliest Sediments on Earth,an sometimes be obtained by direct analysis of the sediments themselves, but more frequently by age measurements on stratigraphically related volcanic rocks, or by interpolation between dated older basement rocks and younger intrusive rocks. Provided that stratigraphical/geochronological correlation

要求比…更好

Inorganic Chemistry of Earliest Sediments: Bioinorganic Chemical Aspects of the Origin and Evolutioygen have been studied intensively and extensively, but the other essential elements have been rather neglected in the studies of chemical and biological evolution. This article attempts to assess the significance of inorganic chemistry in chemical and biological evolutionary processes on the earth.

flourish

Biologically Mediated Isotope Fractionations: Biochemistry, Geochemical Significance and Preservatial scale, with the light species (.C, .S) markedly concentrated in biogenic materials. Since the biological effects are basically retained when carbon and sulfur are incorporated in sediments, the respective fractionations are propagated into the rock section of the geochemical cycle, this having co

固定某物

,Organic Molecules as Chemical Fossils — The Molecular Fossil Record, hundreds of millions of years, if they are not exposed to raised temperatures and are stored in the sedimentary column in such a way that they are not subject to oxidation or microbial attack. The signature of environments is written in sediments in the form of specific “biological marker” componen