Newteen camsporn - Aspartic acid racemization dating
Age estimation by telomere length did not show any correlation with GLG ages and is not recommended for harp seals.
) in the southeastern Barents Sea for the purpose of comparing age estimates obtained by 3 different methods, the traditional technique of counting growth layer groups (GLGs) in teeth and 2 novel approaches, aspartic acid racemization (AAR) in eye lens nuclei and telomere sequence analyses as a proxy for telomere length.
A significant correlation between age estimates obtained using GLGs and AAR was found, whereas no correlation was found between GLGs and telomere length.
Asp racemization thus provides a means of dating recent faunal assemblages of molluscs and other biogenic carbonates, as well as recent terrestrial, fluvial and marine sedimentary sequences that contain molluscs.
At a widely publicized news conference in August of 1972, Dr.
The amino group of one amino acid can combine with the carboxyl group of a second amino acid to form a "peptide" bond, and its carboxyl group can combine with the amino group of a third amino acid, and the chain can thus be extended indefinitely.