Efficiency of light diffraction by cross-striated muscle fibers under stretch and during isometric contraction

Biophysical Journal
R Rüdel, F Zite-Ferenczy

Abstract

When light is diffracted by a single frog muscle fiber the intensities I kappa of the different orders kappa (kappa = 1,2,3) strongly depend on the angle between the axis of the incident beam and the fiber axis. Maximum intensity is not obtained with perpendicular incidence (omega = 0 degree) but at angles that can be calculated for each order number and sarcomere length using Bragg's formula. In analogy to techniques developed for x-ray structure analysis of mosaic crystals we have rotated the fiber around an axis perpendicular to the fiber axis and to the incident beam axis within an angular range delta omega = +/- 35 degrees and recorded the light intensities I kappa. Diffraction efficiencies defined as E kappa = integral of I kappa d omega were studied as a function of sarcomere length and during isometric contraction. The sarcomere length dependences of the efficiencies E kappa of the first three orders show characteristic trends. E1 increases with fiber stretch, E2 has a minimum at a sarcomere length near 2.8 micrometers, and E3 has a maximum near 2.5 micrometers. These trends as well as the observed efficiency ratios are in fairly good agreement with predictions by the intensity formula developed for x-ray structure anal...Continue Reading

References

Oct 1, 1979·Biophysical Journal·R J BaskinY Yeh
Apr 25, 1978·Pflügers Archiv : European journal of physiology·F Zite-Ferenczy, R Rüdel
Sep 1, 1978·Biophysical Chemistry·S Fujime, S Yoshino
May 1, 1975·The Journal of General Physiology·R F Bonner, F D Carlson
Jul 1, 1975·Biophysical Journal·F D Carlson
Sep 1, 1973·Biophysical Journal·M Kawai, I D Kuntz

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Citations

Sep 1, 1989·Pflügers Archiv : European journal of physiology·A F LeungJ C Hwang
Apr 1, 1986·Pflügers Archiv : European journal of physiology·K Burton, R J Baskin
Jun 1, 1986·Journal of Muscle Research and Cell Motility·F Zite-FerenczyW Wilke
Jun 1, 1981·Journal of Muscle Research and Cell Motility·T ObaR L Lieber
Apr 1, 1987·Journal of Muscle Research and Cell Motility·P Haugen, O Sten-Knudsen
Oct 1, 1984·Journal of Muscle Research and Cell Motility·S Fujime
Dec 1, 1982·Journal of Muscle Research and Cell Motility·A F Leung
Oct 1, 1984·Journal of Muscle Research and Cell Motility·A F Leung
Nov 28, 2008·Journal of the Optical Society of America. A, Optics, Image Science, and Vision·Janaka Ranasinghesagara, Gang Yao

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