Aspartic acid racemization dating
Temperature and humidity histories of microenvironments are being produced at ever increasing rates as technologies advance and technologists accumulate data.
Sample preparation entails the identification, raw extraction, and separation of proteins into their constituent amino acids, typically by grinding followed by acid hydrolysis.Also, D/L concentration thresholds appear to occur as sudden decreases in the rate of racemization.These effects restrict amino acid chronologies to materials with known environmental histories and/or relative intercomparisons with other dating methods.Thus, measuring the ratio of D to L in a sample enables one to estimate how long ago the specimen died.The rate at which racemization proceeds depends on the type of amino acid and on the average temperature, humidity, acidity (p H), and other characteristics of the enclosing matrix.Bone, shell, and sediment studies have contributed much to the paleontological record, including that relating to hominoids.
Verification of radiocarbon and other dating techniques by amino acid racemization and vice versa has occurred.
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used to estimate the age of a specimen in paleobiology, molecular paleontology, archaeology, forensic science, taphonomy, sedimentary geology and other fields.
The differentiation of cooked from uncooked bone, shell, and residue is sometimes possible.
Human cultural changes and their effects on local ecologies have been assessed using this technique.
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