RESUMEN
New remains of a Taymyr mammoth, including bones, bone collagen, hairs, skin, and soft (muscle and fat) tissues were studied comprehensively by mineralogical, spectroscopic, chromatographic, and isotope-geochemical methods. The results were used to infer the mammoth's biological age and diet, paleoclimatic conditions, and the mechanisms and degree of fossilization of the remains.
RESUMEN
The purpose of work is to determine the ratio of amino acid enantimers in bioapatite of human teeth and the influence of pathological processes in periodontium on the degree of racemization of amino acids. Objects of research - enamel without signs of caries, root dentin of permanent teeth and enamel of human carious milk teeth (n=16). Identification and determination of amino acid content in the samples was performed on a GC-17A gas chromatograph (Shimadzu, Chirasil-L-Val capillary column). D-forms were detected for three amino acids: alanine (Ala), aspartic (Asp) and glutamic (Glu) acids. Studies have shown the highest D/L Asp and Glu ratios for bioapatite enamel of tooth, removed due to pathological changes in periodontal tissues, and root dentin of the retained teeth. The ratio D/L Asp indicates the absence of relationship between the degree of racemization of aspartic acid in the teeth involved in pathological processes and biological age. Low D/L ratios of Asp, Glu and Ala are determined in teeth removed by orthodontic indications. It was noted that the use of racemization degree of aspartic acid in enamel and dentin bioapatite as one of the methods for assessing the exact biological age of unidentified remains is problematic without identifying inflammatory and degenerative processes in periodontal tissue.