Bulletin of the American Physical Society
APS March Meeting 2011
Volume 56, Number 1
Monday–Friday, March 21–25, 2011; Dallas, Texas
Abstract: C1.00226 : Range of spectral exponents in rigor-state muscle fibers -- a 1/f noise family affair?
Author:
Using EPR spectroscopy, we have followed changes in crossbridge
state in
rigor-state muscle fibers as a function of time. These observed
changes were
of two types -- erratic fluctuations taking place on multiple
time scales,
and slowly-relaxing transients in response to substrate analog.
For both
types of change, the resulting power spectra had a 1/f-like
power-law form
with spectral exponents ranging from near 0 (white noise) to
around 2 (brown
noise). The average exponent was around 1 (pink noise). This
observed broad
range of spectral exponents is similar to that seen in the
extended-family
model of 1/f noise processes -- a model that includes members
ranging from
white noise to pink to brown (JM Halley, Trends. Ecol. Evoln.
\underline
{11}, 33, 1996). Properties of this extended family model include
self-affinity, long correlation times (memory), and
non-stationarity (JM
Halley {\&} P Inchausti, Fluct. Noise. Lett \underline {4}, R1,
2004). We
conclude that the broad range of spectral exponents observed in
rigor-state
muscle fibers reflects a type of underlying 1/f process. However,
this
particular type of process is unusual in that, although produced
by a
\underline {single} biological source (rigor muscle fibers), it
appears to
include not just one but \underline {all} of the members of the
extended 1/f
noise family -- from white to pink to brown.
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2011.MAR.C1.226
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