Sinyukhin began by cutting one branch from each of a series of tomato plants....

Sinyukhin began by cutting one branch from each of a series of tomato plants. Then he took electrical measurements around the wound as each plant healed and sent out a new shoot near the cut. He found a negative current-a stream of electrons-flowing from the wound for the first few days. A similar "current of injury" is emitted from all wounds in animals. During the second week, after a callus had formed over the wound and the new branch had begun to form, the current became stronger and reversed its polarity to positive. The important point wasn't the polarity-the position of the measuring electrode with respect to a reference electrode often determines whether a current registers as positive or negative. Rather, Sinyukhin's work was significant because he found a change in the current that seemed related to reparative growth. Sinyukhin found a direct correlation between these orderly electrical events and biochemical changes: As the positive current increased,cells in the area more than doubled their metabolic rate, also becoming more acidic and producing more vitamin C than before. Sinyukhin then applied extra current, using small batteries, to a group of newly lopped plants, augmenting the regeneration current.These battery-assisted plants restored their branches up to three times faster than the control plants. The currents were very small-only 2 to 3 microamperes for five days. {An ampere is a standard unit of electric current, and a microampere is one millionth of an ampere.} Larger amounts of electricity killed the cells and had no growth-enhancing effect. Moreover, the polarity had to match that normally found in the plant. When Sinyukhin used current of the opposite polarity, nullifying the plant's own current, restitution was delayed by two or three weeks.

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