of the cells would be exported from within the living cells to outside of the cell organism where it could be acted upon without further catabolism by any other organism to produce electrons with a negative standard reduction potential as close as possible to hydrogen u2212 0 42 volts oxygen 0 82 volts produced by the water splitting activity of photosynthesis would constitute a readily available source of oxidant and should be thought of as the oxidant of choice for accepting electrons at the cathode whether the cathode is separated from the living cells to which oxygen is delivered or is spatially set among the cells to which oxygen diffuses to demonstrate biomass voltage as a result of the redox process a simple test was conducted to determine the voltage and conductivity of a 500 mg dried alga mass as follows in respiration and photosynthesis processes by which living cells produce or use energy a change within the liquid medium occurs which is reflected in the metric ph potential hydrogen as ph is a measurement for the potential of hydrogen ionic value in an aqueous solution the reduction potential is a measure of the tendency of the solution to either gain or lose electrons when it is subject to change by introduction of a.