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rdf:type |
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lifeskim:mentions |
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pubmed:dateCreated |
1990-3-19
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pubmed:abstractText |
1. By applying the X-ray diffraction method to chemically skinned papillary muscles of the rat, the transfer of myosin heads from the thick to the thin filaments was studied as a function of Ca2+ concentration. 2. No significant transfer of the heads occurred when the Ca2+ concentration was below the threshold of contraction (pCa 6.2). 3. During the maximum isometric contraction at pCa 4.4, 80% of the myosin heads were transferred to the thin filament. 4. When the muscle was activated isometrically at low Ca2+ concentrations (pCa 6.2-5.8), where the average tension was less than 20% of the maximum, a disproportionately large number of myosin heads were transferred to the thin filament. 5. It was concluded that a significant fraction of the heads transferred at the low Ca2+ concentrations does not produce tension.
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pubmed:commentsCorrections |
http://linkedlifedata.com/resource/pubmed/commentcorrection/2621610-1079574,
http://linkedlifedata.com/resource/pubmed/commentcorrection/2621610-1185677,
http://linkedlifedata.com/resource/pubmed/commentcorrection/2621610-14058441,
http://linkedlifedata.com/resource/pubmed/commentcorrection/2621610-2419483,
http://linkedlifedata.com/resource/pubmed/commentcorrection/2621610-2580968,
http://linkedlifedata.com/resource/pubmed/commentcorrection/2621610-307597,
http://linkedlifedata.com/resource/pubmed/commentcorrection/2621610-3156404,
http://linkedlifedata.com/resource/pubmed/commentcorrection/2621610-3719928,
http://linkedlifedata.com/resource/pubmed/commentcorrection/2621610-3900426,
http://linkedlifedata.com/resource/pubmed/commentcorrection/2621610-4243851,
http://linkedlifedata.com/resource/pubmed/commentcorrection/2621610-4541885,
http://linkedlifedata.com/resource/pubmed/commentcorrection/2621610-4817795,
http://linkedlifedata.com/resource/pubmed/commentcorrection/2621610-5719221,
http://linkedlifedata.com/resource/pubmed/commentcorrection/2621610-5902558,
http://linkedlifedata.com/resource/pubmed/commentcorrection/2621610-6049687,
http://linkedlifedata.com/resource/pubmed/commentcorrection/2621610-6248019,
http://linkedlifedata.com/resource/pubmed/commentcorrection/2621610-6266539,
http://linkedlifedata.com/resource/pubmed/commentcorrection/2621610-6771253,
http://linkedlifedata.com/resource/pubmed/commentcorrection/2621610-6961408,
http://linkedlifedata.com/resource/pubmed/commentcorrection/2621610-6994598,
http://linkedlifedata.com/resource/pubmed/commentcorrection/2621610-7143258,
http://linkedlifedata.com/resource/pubmed/commentcorrection/2621610-903897,
http://linkedlifedata.com/resource/pubmed/commentcorrection/2621610-958428
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pubmed:language |
eng
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pubmed:journal |
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pubmed:citationSubset |
IM
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pubmed:chemical |
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pubmed:status |
MEDLINE
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pubmed:month |
Oct
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pubmed:issn |
0022-3751
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pubmed:author |
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pubmed:issnType |
Print
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pubmed:volume |
417
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pubmed:owner |
NLM
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pubmed:authorsComplete |
Y
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pubmed:pagination |
555-65
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pubmed:dateRevised |
2009-11-19
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pubmed:meshHeading |
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pubmed:year |
1989
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pubmed:articleTitle |
Cross-bridge movement in rat cardiac muscle as a function of calcium concentration.
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pubmed:affiliation |
Department of Pharmacology, University of Tohoku School of Medicine, Sendai, Japan.
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pubmed:publicationType |
Journal Article,
In Vitro,
Research Support, Non-U.S. Gov't
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