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butanedione/accidente cerebrovascular
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9 resultados
Pre-power stroke cross bridges contribute to force during stretch of skeletal muscle myofibrils.
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When activated skeletal muscle is stretched, force increases in two phases. This study tested the hypothesis that the increase in stretch force during the first phase is produced by pre-power stroke cross bridges. Myofibrils were activated in sarcomere lengths (SLs) between 2.2 and 2.5 microm, and
Recovery of contractile function of postischemic, reperfused myocardium: influence of 2,3-butanedione-2-monoxime.
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Inhibition of mechanical activity during ischemia could improve recovery of stunned myocardium. In this study, the effect of 2,3-butanedione-2-monoxime (BDM), an agent that disrupts excitation-contraction coupling, on the time course of recovery of contractile function of postischemic reperfused
Increase of atrial ANP release by 2,3-butanedione monoxime in beating rabbit atria.
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2,3-Butanedione monoxime (BDM) is a chemical phosphatase and has been known to dissociate mechanical contraction in the excitation-contraction coupling via inhibition of myofibrillar ATPase. BDM has also been found to decrease sarcolemmal L-type Ca(2+) channel activity and intracellular Ca(2+) in
BDM affects nucleotide binding and force generation steps of the cross-bridge cycle in rabbit psoas muscle fibers.
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The effect of 2,3-butanedione monoxime (BDM) on elementary steps of the cross-bridge cycle was studied with the sinusoidal analysis technique in skinned rabbit psoas muscle fibers. Our results showed that isometric tension and stiffness decreased progressively with an increase in the BDM
Characterization of the cross-bridge force-generating step using inorganic phosphate and BDM in myofibrils from rabbit skeletal muscles.
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The inhibitory effects of inorganic phosphate (P(i)) on isometric force in striated muscle suggest that in the ATPase reaction P(i) release is coupled to force generation. Whether P(i) release and the power stroke are synchronous events or force is generated by an isomerization of the quaternary
Incomplete recovery of working heart function after twenty-four-hour preservation with a modified University of Wisconsin solution.
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METHODS
This study was designed to determine the function of isolated rabbit hearts after static preservation with modified University of Wisconsin solution for 24 hours. Commercially available University of Wisconsin solution, modified with CaCl2 1 mmol/L and 2,3-butanedione monoxime 30 mmol/L, was
Force enhancement and relaxation rates after stretch of activated muscle fibres.
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The residual force enhancement following muscle stretch might be associated with an increase in the proportion of attached cross-bridges, as supported by stiffness measurements. In this case, it could be caused by an increase in the attachment or a decrease in the detachment rate of cross-bridges,
Detachment of low-force bridges contributes to the rapid tension transients of skinned rabbit skeletal muscle fibres.
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1. To probe the cross-bridge cycle and to learn more about the cardioplegic agent BDM (2,3-butanedione monoxime), its effects on the force-velocity properties and tension transients of skinned rabbit muscle fibres were studied at 1-2 degrees C and pH 7.0. 2. Three millimolar BDM decreased isometric
Myosin Activator Omecamtiv Mecarbil Increases Myocardial Oxygen Consumption and Impairs Cardiac Efficiency Mediated by Resting Myosin ATPase Activity.
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BACKGROUND
Omecamtiv mecarbil (OM) is a novel inotropic agent that prolongs systolic ejection time and increases ejection fraction through myosin ATPase activation. We hypothesized that a potentially favorable energetic effect of unloading the left ventricle, and thus reduction of wall stress, could
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