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Light to Electrical Energy Conversion
in Photosynthetic Bacteria Cells and Cell Fragments Located between Semiconducting and
Metal Electrodes Arkadiusz Ptak and Danuta Frackowiak E-mail: frackow@phys.put.poznan.pl
or aptak@phys.put.poznan.pl
Photopotential action spectra as well kinetics of their generation and decay for green bacteria Prosthecochloris aestuarii cells and cell fragments were measured. The sample was located between two transparent electrodes, both semiconducting or one semiconducting and second one - metallic. In the photopotential action spectrum the maximum at 747 nm responsible
for the bacteriochlorophyll c oligomers absorption is absent. It shows that
bacteriochlorophyll c molecules located in chlorosome oligomers are not taking part
in the photopotential generation. The photopotential amplitudes increased with the sample
pheophytinization. The samples exhibit the light gradient effect it means the change of
the sign of the photopotential with the change of the side of illumination of the
electrochemical cell. |