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These effects restrict amino acid chronologies to materials with known environmental histories and/or relative intercomparisons with other dating methods.Temperature and humidity histories of microenvironments are being produced at ever increasing rates as technologies advance and technologists accumulate data.In this article we shall discuss the principles behind amino acid dating (also known as racemization dating); we shall discuss how it ought to work, and why it often doesn't.An object is said to have chirality if it is not possible to make it into a mirror-image of itself by turning it round.

A change in neutrino radiation into our atmosphere, in earlier times, would also dramatically affect radiocarbon dating. In spite of these complications, fossils of similar characteristics, and which have experienced similar conditions of preservation, can be placed in a relative age sequence on the basis of D/L ratios.Due to the strong dependency of racemization rates on temperature, water concentration, and alkalinity, uncertainties regarding conditions of preservation can leave amino-acid-based age relationships among even similar fossils open to question.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.Also, D/L concentration thresholds appear to occur as sudden decreases in the rate of racemization.




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