[Dependence of the rate of EPR spin-lattice relaxation of certain proteins on temperatures in the interval 6-22 K].

It was shown, that rate of spin-lattice relaxation EPR signals of ferredoxin in temperature interval 9-22 K is proportional to T5. The mechanism of spin-lattice relaxation of non crystalline systems that explains the experimentally observed strange peculiarities of temperature dependence of relaxation rate, for a number of globular proteins, has been considered.