J Physiol Boston Smyposia
HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS
QUICK SEARCH:   [advanced]


     

J Physiol Vol 270, Issue 2 pp 311-320
Copyright © 1977 by The Physiological Society
This Article
Right arrow Full Text (PDF)
Services
Right arrow Email this article to a friend
Right arrow Similar articles in this journal
Right arrow Similar articles in PubMed
Right arrow Alert me to new issues of the journal
Right arrow Download to citation manager
Citing Articles
Right arrow Citing Articles via HighWire
Right arrow Citing Articles via Google Scholar
Google Scholar
Right arrow Articles by Matsubara, I
Right arrow Articles by Yagi, N
Right arrow Search for Related Content
PubMed
Right arrow PubMed Citation
Right arrow Articles by Matsubara, I
Right arrow Articles by Yagi, N

An X-ray diffraction study of the cross-circulated canine heart.

 I Matsubara, H Suga and N Yagi

1. The equatorial X-ray diffraction pattern was recorded from a papillary muscle of a cross-circulated canine heart at different phases of the cardiac cycle. The intensity ratio of the 1, 0 and the 1, 1 reflexions (I1, o/I1,1) was 0-79 in the systolic phase and 1-19 in the diastolic phase. 2. Using the intensity ratio obtained, the approximate proportion of the myosin projections present in the vicinity of the thin filaments was calculated. This was 70-71% in the systolic phase and 51-52% in the diastolic phase of the total myosin projections. 3. The peak systolic tension was roughly proportional to the proportion of the projections present in the vicinity of the thin filaments during systole. 4. The projections which stayed in the vicinity of the thin filaments during diastole did not produce significant contractile force.




This article has been cited by other articles:


Home page
 Biophys. JHome page
J. T. Pearson, M. Shirai, H. Tsuchimochi, D. O. Schwenke, T. Ishida, K. Kangawa, H. Suga, and N. Yagi
Effects of Sustained Length-Dependent Activation on In Situ Cross-Bridge Dynamics in Rat Hearts
Biophys. J., December 15, 2007; 93(12): 4319 - 4329.
[Abstract] [Full Text] [PDF]

Home page
 CirculationHome page
J. T. Pearson, M. Shirai, H. Ito, N. Tokunaga, H. Tsuchimochi, N. Nishiura, D. O. Schwenke, H. Ishibashi-Ueda, R. Akiyama, H. Mori, et al.
In Situ Measurements of Crossbridge Dynamics and Lattice Spacing in Rat Hearts by X-Ray Diffraction: Sensitivity to Regional Ischemia
Circulation, June 22, 2004; 109(24): 2976 - 2979.
[Abstract] [Full Text] [PDF]

Home page
 Am. J. Physiol. Heart Circ. Physiol.Home page
J. Araki, H. Matsubara, J. Shimizu, T. Mikane, S. Mohri, J. Mizuno, M. Takaki, T. Ohe, M. Hirakawa, and H. Suga
Weibull distribution function for cardiac contraction: integrative analysis
Am J Physiol Heart Circ Physiol, November 1, 1999; 277(5): H1940 - H1945.
[Abstract] [Full Text] [PDF]

Home page
 Physiol. Rev.Home page
B. M. MILLMAN
The Filament Lattice of Striated Muscle
Physiol Rev, April 1, 1998; 78(2): 359 - 391.
[Abstract] [Full Text] [PDF]

Home page
 Cardiovasc ResHome page
J.A Lee and D.G Allen
Calcium sensitisers: mechanisms of action and potential usefulness as inotropes
Cardiovasc Res, October 1, 1997; 36(1): 10 - 20.
[Full Text] [PDF]


HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS
Copyright © 1977 The Physiological Society.