期刊名称：Proceedings of the National Academy of Sciences
印刷版ISSN：0027-8424
电子版ISSN：1091-6490
出版年度：1974
卷号：71
期号：5
页码：2096-2097
DOI：10.1073/pnas.71.5.2096
语种：English
出版社：The National Academy of Sciences of the United States of America
摘要：The 13C spin-lattice relaxation times, T1's, of several amino acids have been measured as a function of pD and concentration. A strong dependence of the carboxyl carbon T1 was observed for both pD and concentration and is believed to be due to intermolecular associations. For the carboxyl carbon, spin rotation is proposed as the predominant relaxation mechanism, whereas the other carbons are relaxed mainly by the dipole-dipole mechanism, and their relaxation times are relatively independent of changes in concentration and pD.
