Journal Article Action potential Chara corallina Chara internodal cells Characeae Chlorophyll fluorescence Chlorophyll fluorescence transients Chloroplast membrane transporters Cytoplasmic streaming Electrical Signaling Excitable membranes Hyperpolarizing response K(+)-conductive state Long-distance transport NADPH oxidase Oxygen Plasma membrane H(+)/OH(−) transport Plasma membrane–chloroplast interactions Research Support, Non-U.S. Gov't S88TT14065 cytoskeleton mechanical stress oxygen platinum nanoelectrodes