[Measurement of the magnetic relaxation of water molecules in biological systems by the impulse NMR technic with calculation of their volume].

Impulse sequences are presented for selective by biological system volume measurements of the times of spin--spin, spin--lattice relaxation of water molecules by means of NMR spin echo. Selectivity of the programs is based on the fact that in the presence of magnetic field impulse gradient diffusion quenching of the echo differs for water molecules limited or unlimited in their diffusion displacement by some barriers (membranes) and it also differs for molecules limited in compartments of different size. Selective measurement of the times of spin--spin relaxation (T2) of water in intracellular structures of the yeast cells gave the value 24.4 msec, which is 1.3 times lower than the specimen volume measured by standard method.