Colonic tissue from the turtle (Psrudemys scriptu) was exposed in a Ussing chamber to simultaneously applied static and time-varying magnetic fields. Transepithelial differences of potential were monitored as frequency of the AC field was varied continuously or in discrete steps from 3 to 770 Hz. De
On the cyclotron resonance model of ion transport
β Scribed by Dr. Jack Sandweiss
- Publisher
- John Wiley and Sons
- Year
- 1990
- Tongue
- English
- Weight
- 125 KB
- Volume
- 11
- Category
- Article
- ISSN
- 0197-8462
No coin nor oath required. For personal study only.
β¦ Synopsis
The cyclotron-resonance model, which has been suggested as an explanation of a purported enhancement of transport of ions through the membranes of cells exposed to weak, lowfrequency-modulated RF fields, is shown to be inconsistent with basic physical principles.
Under the conditions of the model, in which the ions are presumed to circulate under the constraint of the earth's magnetic field, the radii of gyration of the ions would approximate 50 m and, thus, are much larger than the cells. Moreover, from general considerations, the collision-damping time of such ions is expected to be less than lO-"s, much smaller than the times of the order of lo--* s, shown to be necessary if the conditions for low-frequency resonance are to be satisfied.
π SIMILAR VOLUMES
The cyclotron resonance model, recently proposed to account for physiological response to weak environmental magnetic fields, is shown to violate the laws of classical mechanics. Further, it is argued that the ubiquitous presence of dynamic friction in fluid media precludes significant magnetic effe
Using laser microprobe and Fourier transform ion cyclotron resonance (FTICR) mass spectrometry, we have produced and trapped aromatic species which might well be laboratory analogues of interstellar polycyclic aromatic hydrocarbons. These species are produced by laser ablation of a sample of pyrolys
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We have determined the mas spectra of three polypeptides which have been designed as an effective reagent to be used in the diagnosis of a Chinese strain of Hepatitis E Virus (HEV). The spectra were determined by elecbrospwy ionization-Fourier transform ion cyclotron resonance mass spectrometer. The