Beta dispersion
cell biology
Beta dispersion is the phenomenon associated with the ability of a biological cell membrane to filter out low frequency currents and allow high frequency currents to pass through. It was originally hypothesized by Rudolf Höber in 1910 and confirmed through a series of experiments between 1910 and 1913.
Höber observed that living tissue has greater electrical resistance compared to dead tissue and that there could be two reasons for this. His first hypothesis was that ions do not pass freely through the cell surface. This property maintains ions within the cell. Upon cell death, the insulating property of the cell membrane is lost. He also hypothesized that electrolytes within the cell were bound to internal structures and would dissociate from these structures during cell death and would then be able to exit the cell. Höber then performed a series of experiments to test these hypotheses.
Höber used centrifugation to obtain a dense pellet of red blood cells then measured the conductivity of the cell sample at low frequencies (100 – 200 Hz) by using methods developed by Friedrich Kohlrausch. It was determined that the cells had a conductivity equal to 0.02% NaCl solution.
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