The Oxford dates were all between 4,500 and 8,500 years BP and the Arizona dates were between 3,000 and 6,600 years BP.Bada et al., (1984) stated that the Oxford AMS results reveal no clear relationship between the radiocarbon ages of the various skeletons and the extent of the aspartic acid racemization.They did note that there appeared to be a direct relationship between the extent of racemization and the level of preservation of collagen in the bones.Those samples with the most racemization had the lowest amino acid content and this poor preservation of protein would contribute to anomalous AAR recalculated the AAR dates of the other Paleo-Indian samples.
Although Bada claimed consistency between AAR and AMS dates others (Pollard and Heron 1996, p.
Conventional plus accelerator mass spectrometry (AMS) radiocarbon dating (Taylor et al.
1983) was carried out on the Sunnyvale skeleton and results of between 3,600 and 4,850 years BP were obtained.
These two forms are called "enantiomers", "chirals", or "stereoisomers", which basically means that they have the same molecular and structural formula but cannot be superimposed on each other no matter how they are oriented in space.
Such extrapolations have been fairly recently (1999) called into question by experiments showing that models based on high temperature kinetics fail to predict racemization kinetics at physiologic temperatures (i.e., 37 C). We argue that the D: L ratio of Asx reflects the proportion of non-helical to helical collagen "The local buffering effects of bone and shell matrixes are supposed to limit this effect, but it is still something to consider as potentially significant when acting over the course of tens of thousands to millions of years.replacement of the asparagine residue with aspartic acid resulted in a 34-fold decrease in the rate of succinimide (Asu) formation.