Instant rerouting of photosynthetic electron transport to O reduction after the plasma membrane excitation of Chara in the presence of methyl viologen.

-Action potential (AP) of excitable plant cells is an important signaling event that can differentially alter physicochemical and physiological processes in various parts of the same cell. In giant cells of characean algae, the AP propagation has minor effect on photosynthetic electron transport in areas with high activity of plasmalemmal H-pump but inhibits linear electron flow in regions featuring high passive H/OH conductance of the plasma membrane (PM). Uneven spatial distributions of local periplasmic and cytoplasmic pH facilitate the operation of distinct (CO-dependent and O-mediated) pathways of photoinduced electron flow, which presumably accounts for differential influence of AP on photosynthesis.

Effects of chloroplast-cytoplasm exchange and lateral mass transfer on slow induction of chlorophyll fluorescence in Characeae.

Rapid cytoplasmic streaming in characean algae mediates communications between remote cell regions exposed to uneven irradiance. The metabolites exported from brightly illuminated chloroplasts spread along the internode with the liquid flow and cause transient changes in chlorophyll fluorescence at cell areas that are exposed to dim light or placed shortly in darkness. The largest distance to which the photometabolites can be transported has not yet been determined.

Photoinduction of electron transport on the acceptor side of PSI in Synechocystis PCC 6803 mutant deficient in flavodiiron proteins Flv1 and Flv3.

After transferring the dark-acclimated cyanobacteria to light, flavodiiron proteins Flv1/Flv3 serve as a main electron acceptor for PSI within the first seconds because Calvin cycle enzymes are inactive in the dark. Synechocystis PCC 6803 mutant Δflv1/Δflv3 devoid of Flv1 and Flv3 retained the PSI chlorophyll P700 in the reduced state over 10 s (Helman et al., 2003; Allahverdiyeva et al.

Self-Organization Induced by Self-Assembly in Microheterogeneous Reaction-Diffusion System.

When acrylamide (AA) monomers are added to the Belousov-Zhabotinsky (BZ) reaction incorporated into nanodroplets of water-in-oil aerosol OT (AOT) microemulsion (the BZ-AOT system), free radicals produced in the BZ reaction initiate polymerization of AA monomers and polyacrylamide particles are formed. These particles change the microstructure of the AOT microemulsion thus inducing the transition from Turing patterns to new dissipative patterns which can be either stationary "black" spots or waves.

Discontinuously propagating waves in the bathoferroin-catalyzed Belousov-Zhabotinsky reaction incorporated into a microemulsion.

Three new types of discontinuously propagating waves are reported in the bathoferroin-catalyzed Belousov-Zhabotinsky (BZ) reaction dispersed in water-in-oil Aerosol OT microemulsion. Jumping waves (JWs) are typically observed at or above room temperature and develop from the familiar trigger waves. Bubble waves (BWs) typically emerge from trigger or JWs at similar temperatures, while rotating waves (RWs) evolve from JW at higher temperatures (>40 degrees C).