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Glycerol-extracted rabbit psoas muscle fibers were examined by electron microscopy both before and after ATP-induced isotonic shortening. Ultrastructural changes were correlated with the initial sarcomere length and the degree of shortening. The ultrastructural appearance of the resting fiber at rest length was identical with that described by H. E. Huxley and Hanson. At sarcomere lengths greater than 3.7 to 3.8 micro, the A and I filaments were detached and separated by a gap. The presence of "gap" filaments was confirmed, and evidence is presented which indicates that these filaments form connections between the ends of the A and I filaments. Shortening from initial sarcomere lengths at which the filaments overlapped took place through sliding of the filaments. If shortening was initiated from sarcomere lengths at which there was a gap, a narrowing of the I band was brought about by a curling of the I filaments at the boundary between the A and I bands. No evidence could be found that the I filaments moved into the A band.
F Carlsen, and
F Fuchs, and
G G Knappeis
January 1969,
Protoplasma,
F Carlsen, and
F Fuchs, and
G G Knappeis
January 1970,
Archives of biochemistry and biophysics,
F Carlsen, and
F Fuchs, and
G G Knappeis
August 1967,
American zoologist,
F Carlsen, and
F Fuchs, and
G G Knappeis
June 1963,
The Japanese journal of physiology,
F Carlsen, and
F Fuchs, and
G G Knappeis
January 1964,
Sapporo igaku zasshi. The Sapporo medical journal,
F Carlsen, and
F Fuchs, and
G G Knappeis
January 1955,
Biochemische Zeitschrift,
F Carlsen, and
F Fuchs, and
G G Knappeis
September 1981,
Pflugers Archiv : European journal of physiology,
F Carlsen, and
F Fuchs, and
G G Knappeis
April 1965,
Journal of cellular physiology,
F Carlsen, and
F Fuchs, and
G G Knappeis
October 1971,
The American journal of physiology,
F Carlsen, and
F Fuchs, and
G G Knappeis
March 1953,
Experientia,
