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Stress Action on Biological Tissue and Tissue Models Detected by the Py Value
Author(s) -
PLIQUETT FRITZ,
PLIQUETT UWE
Publication year - 1999
Publication title -
annals of the new york academy of sciences
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.712
H-Index - 248
eISSN - 1749-6632
pISSN - 0077-8923
DOI - 10.1111/j.1749-6632.1999.tb09471.x
Subject(s) - economic shortage , biological tissue , dispersion (optics) , electrical resistivity and conductivity , stress (linguistics) , electric field , stimulation , measure (data warehouse) , field (mathematics) , action (physics) , biophysics , materials science , biomedical engineering , chemistry , physics , mathematics , computer science , biology , medicine , optics , philosophy , quantum mechanics , database , government (linguistics) , pure mathematics , linguistics
A bstract : The Py value, a fast measurable combination of the conductivity at the corner frequencies of the β‐dispersion, is a measure of the relative cell volume concentration in tissue. In many cases, if the biological object is stressed, for instance, by mechanical deformation, shortage of oxygen, electric field strength, temperature rise, or ischemia, Py increases. Depending on the object and the kind of stress, Py plateaus for minutes up to hours and then it decreases continuously. Values of passive electrical parameters of biological tissues are often given without information about the time following a stimulation or stress situation, for example, death, surgery, field application, etc. However, since the passive electrical properties change with time, information about their history, for example, time after death, should be given.