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A method for quick‐freezing live muscles at known instants during contraction with simultaneous recording of mechanical tension
Author(s) -
Padrón Raúl,
Alamo Lorenzo,
Craig Roger,
Caputo Carlo
Publication year - 1988
Publication title -
journal of microscopy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.569
H-Index - 111
eISSN - 1365-2818
pISSN - 0022-2720
DOI - 10.1111/j.1365-2818.1988.tb04616.x
Subject(s) - liquid nitrogen , cryoprotectant , tension (geology) , striated muscles , biophysics , contraction (grammar) , chemistry , materials science , anatomy , composite material , cryopreservation , biology , compression (physics) , embryo , organic chemistry , endocrinology , microbiology and biotechnology
SUMMARY We have developed a quick‐freezing method, using a copper block cooled with liquid helium or nitrogen, which permits us to freeze muscles without any cryoprotectant at predetermined, precisely measured points in the recorded tension time‐course of a single twitch or tetanus. Our aim is to arrest structural intermediates of the cross‐bridge cycle for observation in the electron microscope. Chemically stimulated, demembranated muscles as well as electrically stimulated, live muscles can be frozen on the same apparatus. Good freezing of relaxed and contracting muscles has been obtained to a depth of 10–20 μm, with excellent structural preservation after freeze‐substitution.