[Influence of propagating electrical signals on delayed luminescence of geranium leaves. II. Theoretical analysis].

A mathematical model of delayed luminescence was devised. It is based on the description of primary photosynthetic reactions, which takes the donor and acceptor parties of photosystem II and the electrochemical gradient on thylakoid membranes into account. The model was used for the theoretical analysis of the mechanisms of changes in delayed luminescence characteristics, induced by variation potentials.

[Influence of propagating electrical signals on delayed fluorescence of geranium leaves. 1. Experimental analysis].

It was shown that local damaging stimulation of geranium graft induced the generation and propagation of electrical signals (variation potential), which changed the parameters of delayed luminescence in the leaf blade. The responses of delayed luminescence included two stages, which probably occur by different mechanisms.

Reversible Change of Extracellular pH at the Generation of Mechano-Induced Electrical Reaction in a Stem of Cucurbita pepo.

As was shown recently the generation of cooling-induced action potential accompanies the reversible change of extracellular pH.1 The pH changes are linked to the Ca(2+)-induced transient inhibition of the plasma membrane H(+)-ATPase. Generation of mechano-induced local bioelectrical reaction (LBER) also accompanies the reversible change of extracellular pH.

Subthreshold changes in excitable membranes of Cucurbits pepo L. stem cells during cooling-induced action-potential generation.

The nature of subthreshold changes in excitable plasma membranes has been investigated in stem parenchyma cells of Cucurbita pepo L. during action-potential generation induced by gradual cooling (from 23 to 10 ° C). The character of the subthreshold depolarization of excitable cells is shown to be mainly defined by a decrease in the activity of the plasma-membrane electrogenie pump (H(+)-ATPase).

[Possible apical respiration in the olfactory epithelium of the frog Rana temporaria].

Bioluminescent analysis has been made of the effect of oxygen supply on the content of ATP in the isolated olfactory epithelium of the frog. It was shown that storage of epithelium preparations in the air increases their ATP content. When preparations are kept in the atmosphere of an inert gas, ATP level in the epithelium rapidly decreases, being recovered after transition of preparations to the air medium.