[The use of several types of metal cations--a new approach to the study of the metallophilia of Ranvier's nodes of nerve fibers].

Mechanisms of metal affinity of Ranvier's nodes of myelinated nerve fibers in the peripheral nerve system have been investigated. It is indicated that Fe(3+)-ions are able to reduce to Fe(2+)-ions. Ag(+)-ions compete with Fe(3+)-ions for places of adsorption in a gap [correction of chick] between myelinated segments of Ranvier's node. It is demonstrated that Fe(3+)- and Fe(2+)-ions are adsorbed in the gap [correction of chink], while Ag(+)-ions are adsorbed in the gap [correction of chink] and axon in the bulbs of the node. One can increase ferrocyanide of ferrous sediment by several times by ferricyanide of ferrous sediment as well as by ferrocyanide of silver and of metal silver ones. A possibility to use several kinds of metal ions for demonstration of cytochemical heterogeneity of nerve fibre membrane is discussed.