Figure 1.

(A) The mode stirring reverberation chamber. This is a large room with metal walls (dark lines) to exclude external EMF, an antenna (lower left) to emit tunable EMF, a rotary stirrer to make the EMF homogeneous (right side) and a plant culture chamber placed within the working volume (gray area). (B) Schematic representation of EMF types. a, non-polarized (isotropic) and homogeneous field, where the field components align in all possible directions and the field has the same amplitude at all points. b, polarized, nonhomogeneous field, where the field components align in a single direction while the amplitude varies (heterogeneity).