Bounds on "bound water": transverse nuclear magnetic resonance relaxation in barnacle muscle

Science  15 Oct 1976:
Vol. 194, Issue 4262, pp. 324-326
DOI: 10.1126/science.968484


Relatively mobile protons that do not exchange with D2O exist in barnacle muscle cells. These are not part of the nonfreezing "bound water" that does exchange. Ninety-seven percent of the muscle water exhibits a single transverse relaxation time of 35 milliseconds: one water molecule per thousand, which is briefly and irrotationally bound, will produce the observed relaxation properties.