Amino acid racemization dating techniques

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Sie beruht darauf, dass sich nach Ableben eines Organismus das Mengenverhältnis zwischen der L - und der D -Form enantiomerer Aminosäuren verschiebt: Da die Racemisierung stark temperaturabhängig ist, ist eine verlässliche Datierung nur möglich, wenn das Fossil stabilen Temperaturen ausgesetzt war. Weil zudem nach einer gewissen Zeit der gesamte Überschuss an L -Formen abgebaut ist, liegt die Obergrenze des bestimmbaren Alters bei etwa Spektrum Online-Lexikon Biologie. Mebus A. Geyh, Helmut Schleicher:
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Dating methods wikipedia

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➤ Dating methods wikipedia

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Category:Geochronological dating methods

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This means that the amino acid can have two different configurations, "D" or "L" which are mirror images of each other. With a few important exceptions, living organisms keep all their amino acids in the "L" configuration. When an organism dies, control over the configuration of the amino acids ceases, wikipedia the ratio of D to L moves from a value near 0 towards an equilibrium value near 1, a process called racemization.

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