Stochastic resonance at the single-cell level

Article Abstract:

It has been hypothesized by some researchers that stochastic resonance might be responsible for the sensitivity of organisms to industrial low-frequency magnetic and/or electric fields. Stochastic resonance is a mechanism wherein a system's response to an external signal is increased by the addition of noise. Sergey M. Bezrukov and Igor Vodyanov have developed a stochastic resonance model to test the theory. An application of their model to the signal detection at the level of a single cell suggests that adding noise does not make a hardly detectable signal detectable.

Models, Evaluation, Learning models (Stochastic processes), Stochastic processes, Stochastic models, Random noise theory

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Confounding influence of magnetic fabric on sedimentary records of a field reversal

Article Abstract:

High-resolution sedimentary records of the Upper Olduvai reversal from Confidence Hills, CA, show that the directions of remnant magnetization during the reversal is similar to those of the optimum horizontal axes of the ellipsoids of magnetic anisotropy. This observation suggests that during low geomagnetic intensity, the orientation of elongated grains is influenced by factors other than the geomagnetic field.

Natural history, Death Valley

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Biological sensing of small field differences by magnetically sensitive chemical reactions

Article Abstract:

Research into whether chemical reactions whose rates are affected by the orientation of reactants in magnetic fields could act as the basis of a biological compass is presented. It is shown that a chemically based biological compass is feasible.

Chemical reaction, Conditions and laws of

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