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Regular fluctuations in the height of phase profile of isolated neuron were studied by laser interference microscopy. The resultant spectra of frequencies of changes in the phase profile height indicate regular local changes in the optical density and/or geometry of neurons. The frequency spectra for the central and pri-membrane regions of the cells are different.

The ’’diode’’ equation, which describes the behavior of the Cu2S/CdS solar cell, was derived from the first principles. The key results are the independence of the Voc from the field in CdS and an explanation of the intersection of the dark and illuminated portions of the I-V curves. The limiting factors and correlation with experimental results are discussed.