Zobrazeno 1 - 5
of 5
pro vyhledávání: '"Patricia Masters Helfman"'
Publikováno v:
Proceedings of the National Academy of Sciences. 72:2891-2894
The aspartic acid in human tooth enamel shows increasing racemization with age. This increase is not seen in the metabolically active protein hemoglobin. The rate constant for the racemization reaction of aspartic acid in human tooth enamel was found
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::a1eda2199627757049b959edaaf890ed
https://doi.org/10.1073/pnas.72.8.2891
https://doi.org/10.1073/pnas.72.8.2891
Publikováno v:
Gerontology. 23:419-425
Racemization of aspartyl residues in human dentine and enamel proteins has been shown to occur at a rate which corresponds to an enrichment in the D-aspartic acid content of 0.1 % per year. This rate can be used to calculate the ages of living people
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::2cb592522b35fd410dd28637e36b1cad
https://doi.org/10.1159/000212218
https://doi.org/10.1159/000212218
Autor:
L. Pierquin, A.N. Bozcuk, J.J. Askenazi, R. H. Fagard, Per Lund-Johansen, H. Ernould, W. H. Birkenhäger, J Hellemans, M. Streifler, Ming-Yung Shou, Colin T. Dollery, Jeffrey L. Bada, Françoise Forette, Berthaux P, Denis Clement, J. Vardi, Patricia Masters Helfman, Lynn S. Grinna, Christopher J. Bulpitt, J. M. Rabey, T. Kho, J. Meurice, A.N.G. Clark, Charles L. Goodrick, A Amery, A. De Schaepdryver
Publikováno v:
Gerontology. 23:I-VI
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::14b385594ed97f759ab56d7fab9a2654
https://doi.org/10.1159/000212215
https://doi.org/10.1159/000212215
Publikováno v:
Nature. 262:279-281
THE L-amino acids initially present in bone protein undergo slow racemisation over geological time at a rate which is proportional to temperature1,2. We have shown3 that at the human body temperature of ∼37°C aspartyl residues in tooth enamel prot
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::af9fc64311008c41d4548f479b944a96
https://doi.org/10.1038/262279b0
https://doi.org/10.1038/262279b0
Publikováno v:
World archaeology. 7(2)
The development of amino acid racemization as a dating technique holds considerable promise for resolving questions of human evolution and culture histories. The advantages of this method are: fossil bone can be directly dated; only gram quantities a
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::0edce7b7345a934020aed40e00c93d16
https://pubmed.ncbi.nlm.nih.gov/16470964
https://pubmed.ncbi.nlm.nih.gov/16470964