[Weak magnetic fields and cognitive activity].

The influence of natural level of uniform magnetic field (to 200 microT) on Wistar rat cognition was studied in this work. It was found that influence of disturbed Earth magnetic field has caused a long depression of explorative activity only in the presence of information loading. Such depression was removed only after short external stimulation.

[Autoregulated mechanochemical models].

Systems are analysed which consists of connected in parallel or series contractile (reactor-Rc) and elastic (elastic body-EB) parts similar to Kelvin or Maxwell's rheological models and to sarcomeres of the insect flying muscle (IFM) or vertebrate skeletal muscle. The feedback takes place if EB is a deformable sorbent of the mobile activator or inhibitor (effector--E) of the mechanochemical process proceeding in Rc. The condition of oscillative instability of mechanical rest was found for the system of the parallel type.