The model for the interaction of weak magnetic fields with biosystems,
which has been suggested earlier by the author for the case of impuls
e-like excitation of oscillators (i.e. of ions bound in the Ca2+-depen
dent enzymes or in the protein-enzyme complexes) is extended for the m
ore realistic case of continuous excitation of oscillators. The expres
sions for the polarization degree of oscillator's vibrations in combin
ed, static and alternating magnetic fields are derived. It is postulat
ed that the value of bioeffect induced by magnetic field in a biosyste
m is proportional to the polarization degree of the ion's vibration. T
he available experimental data are shown to be in a remarkably good fi
t with theoretical predictions.