17 April 2001 Photovoltaic response of Tolypothrix tenuis cells and their fragments in photoelectrochemical cell
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We have studied spectral properties and photo potential/photo current generation in cyanobacterium Tolypothrix tenuis cells and their fragments in native and DCMU-treated samples. DCMU is known as an inhibitor of charge carrier process which is able to block the electron flow in photo synthetic apparatus. Since there is a competition among radiative, non-radiative and charge separation processes which lead to deactivation of excited states of molecules following spectroscopic methods have been used in the experiment: absorption, photo acoustics and photo voltage action spectrum (dependence of photo voltage on the excitation wavelength). Spectroscopic investigation was accompanied by photoelectric measurements for which specially photo- electrochemical cell constructed of semiconducting and gold electrodes with Tolypothrix tenuis suspended in polyvinyl alcohol (PVA) - water solution (15%v/v) and immersed between them was used. Kinetics of photo current have been examined in time of seconds. Thermal deactivation process in DCMU-free and DCMU- treated cyanobacterium is discussed and participation of various biliproteins and Chl (alpha) -complexes in light energy conversion is indicated. It has been shown the influence of DCMU treatment on the photo signal generation in Tolypothrix tenuis cyanobacterium. We have shown that Tolypothrix tenuis can be used in a system for light energy conversion into electric energy.
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Danuta Wrobel, Danuta Wrobel, Izabela Hanyz, Izabela Hanyz, Jedrzej Lukasiewicz, Jedrzej Lukasiewicz, } "Photovoltaic response of Tolypothrix tenuis cells and their fragments in photoelectrochemical cell", Proc. SPIE 4413, International Conference on Solid State Crystals 2000: Epilayers and Heterostructures in Optoelectronics and Semiconductor Technology, (17 April 2001); doi: 10.1117/12.425453; https://doi.org/10.1117/12.425453

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