Abstract
Spin-lattice relaxation times (T 1) of intracellular water of the nonmyelinated fibers of rabbit cervical vagus nerve were measured using a paramagnetic shift reagent, s-FDF. Spin-lattice relaxation decay curves were composed of the fast (T 1,F) and slow (T 1,S) relaxation components. The mean values of T 1,F and T 1,S in the polarized nerve fibers at 25°C were 0.12 ± 0.04 and 0.61 ± 0.13 sec., respectively, and their fractions were 0.71 ± 0.07 and 0.29 ± 0.07, respectively (n = 21). On the other hand, those values in the depolarized nerve fibers were 0.16 ± 0.01 sec., 0.77 ± 0.17 sec., 0.77 ± 0.10 and 0.23 ± 0.10, respectively (n = 15). T 1,F and T 1,S for the depolarized nerve fibers were significantly elongated (P < 0.01).
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