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1-20 of 36
Keywords: Action potential
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Journal Articles
Cardiac arrhythmias in fish induced by natural and anthropogenic changes in environmental conditions
Journal:
Journal of Experimental Biology
J Exp Biol (2024) 227 (20): jeb247446.
Published: 9 August 2024
... of toxic substances – is atrioventricular block, which is the inability of the action potential to progress from the atrium to the ventricle. Early and delayed afterdepolarizations are less common in fish hearts than in the hearts of endotherms, perhaps owing to the excitation–contraction coupling...
Includes: Supplementary data
Journal Articles
Journal:
Journal of Experimental Biology
J Exp Biol (2024) 227 (20): jeb247712.
Published: 25 June 2024
... metamorphosis caused shortening of atrial and ventricular action potentials (APs), with no changes in resting membrane potential or maximum velocity of AP upstroke, favoring higher heart rate possible in metamorphic animals. Potential-dependent potassium currents in axolotl myocardium were represented...
Journal Articles
Michael W. Country, Kristina Haase, Katrin Blank, Carlos R. Canez, Joshua A. Roberts, Benjamin F. N. Campbell, Jeffrey C. Smith, Andrew E. Pelling, Michael G. Jonz
Journal:
Journal of Experimental Biology
J Exp Biol (2022) 225 (10): jeb244238.
Published: 27 May 2022
... of a decrease in membrane excitability during the winter. Subsequent measurement of intracellular Ca 2+ activity using Fura-2 microspectrofluorometry confirmed a reduction in action potential activity, including duration and action potential profile, in neurons isolated during the winter. These studies...
Includes: Supplementary data
Journal Articles
Journal:
Journal of Experimental Biology
J Exp Biol (2021) 224 (19): jeb242793.
Published: 6 October 2021
... cerebral cortex. Our results show that an acute reduction in temperature from 20 to 5°C decreases membrane potential, action potential width and amplitude, and whole-cell conductance. Importantly, acute exposure to 5°C considerably slows membrane repolarization by voltage-gated K + channels. Exposing...
Journal Articles
Journal:
Journal of Experimental Biology
J Exp Biol (2021) 224 (16): jeb242778.
Published: 24 August 2021
... between the left leaflet of sinoatrial valve and the posterior horn of the sinus venosus. Heart Reptile Acetylcholine Ionic currents Action potential Pacemaker Danmarks Frie Forskningsfond http://dx.doi.org/10.13039/501100011958 Russian Science Foundation http...
Journal Articles
Journal:
Journal of Experimental Biology
J Exp Biol (2021) 224 (10): jeb238147.
Published: 28 May 2021
...Varshinie Pillai; Leslie Buck; Ebrahim Lari ABSTRACT Goldfish are one of a few species able to avoid cellular damage during month-long periods in severely hypoxic environments. By suppressing action potentials in excitatory glutamatergic neurons, the goldfish brain decreases its overall energy...
Journal Articles
Jonathan A. W. Stecyk, Christine S. Couturier, Denis V. Abramochkin, Diarmid Hall, Asia Arrant-Howell, Kerry L. Kubly, Shyanne Lockmann, Kyle Logue, Lenett Trueblood, Connor Swalling, Jessica Pinard, Angela Vogt
Journal:
Journal of Experimental Biology
J Exp Biol (2020) 223 (22): jeb225730.
Published: 16 November 2020
... (5H fish), on in vivo and spontaneous heart rate ( f H ), electrocardiogram, ventricular action potential (AP) shape and duration (APD), the background inward rectifier ( I K1 ) and rapid delayed rectifier ( I Kr ) K + currents and ventricular gene expression of proteins involved in excitation...
Journal Articles
Journal:
Journal of Experimental Biology
J Exp Biol (2019) 222 (16): jeb202242.
Published: 20 August 2019
... in March (‘winter-acclimatized’). At a common test temperature of 7.5°C, action potential (AP) was shortened by both winter acclimatization and cold acclimation compared with summer acclimation; however, winter acclimatization caused a greater shortening than did cold acclimation. Shortening of AP...
Journal Articles
Journal:
Journal of Experimental Biology
J Exp Biol (2017) 220 (4): 695–704.
Published: 15 February 2017
... remained mostly quiescent, action potential frequency (AP f ) of the stellate neurons increased 68-fold. Furthermore, the GABA A receptor reversal potential ( E GABA ) was determined using the gramicidin perforated-patch-clamp method and found to be depolarizing in pyramidal (−53.8 mV) and stellate...
Journal Articles
Journal:
Journal of Experimental Biology
J Exp Biol (2016) 219 (13): 1941–1952.
Published: 1 July 2016
... and the duration of atrial and ventricular action potentials (APs). Prolonged exposure to new thermal conditions induces compensatory changes in ion channel expression and function, which usually partially alleviate the direct effects of temperature on cardiac APs and heart rate. The most heat-sensitive molecular...
Journal Articles
Journal:
Journal of Experimental Biology
J Exp Biol (2016) 219 (10): 1495–1504.
Published: 15 May 2016
... temperature changes, thermal sensitivity of cardiac excitation in a eurythermal teleost, the roach ( Rutilus rutilus ), was examined. Excitability of the heart was determined from in vivo electrocardiograms and in vitro microelectrode recordings of action potentials (APs) from winter and summer roach...
Journal Articles
Journal:
Journal of Experimental Biology
J Exp Biol (2016) 219 (3): 445–456.
Published: 1 February 2016
... Acartia tonsa elicited fast (∼20 ms) animal-like action potentials accompanied by rapid contraction of the cell to avoid predation. We have shown that the sensory mechanisms of Favella sp. are finely tuned to the type, location, and intensity of stimuli from prey and predators. * Author...
Includes: Supplementary data
Journal Articles
Journal:
Journal of Experimental Biology
J Exp Biol (2014) 217 (2): 299–309.
Published: 15 January 2014
... of I Na was reflected as a low BPT for the rate of action potential upstroke in vitro (21.7±1.2°C) and the velocity of impulse transmission in vivo (21.9±2.2°C). These findings from different levels of biological organization strongly suggest that heat-dependent deterioration of Na + channel function...
Includes: Supplementary data
Journal Articles
Journal:
Journal of Experimental Biology
J Exp Biol (2013) 216 (13): 2459–2468.
Published: 1 July 2013
... of action potentials by cells in the PN, spinal cord and EO. Thus, to provide a biological context for the electric field estimates, we next consider the energetic cost of action potential generation in neurons. It is generally agreed that this cost arises primarily from the Na + /K + -ATPase, which...
Journal Articles
Journal:
Journal of Experimental Biology
J Exp Biol (2006) 209 (16): 3091–3100.
Published: 15 August 2006
... (e-mail: [email protected] ) 10 5 2006 © The Company of Biologists Limited 2006 2006 action potential Na + -Ca 2+ exchange l -type Ca 2+ channel K + channel I Ca I Kr I K1 sarcoplasmic reticulum (SR) temperature fish heart caffeine...
Journal Articles
Journal:
Journal of Experimental Biology
J Exp Biol (2005) 208 (16): 3055–3063.
Published: 15 August 2005
...Steven D. Buckingham; Declan W. Ali SUMMARY Larval somatic muscle of the zebrafish, Danio rerio , like that of some other organisms, responds to a sustained depolarization with one, and only one, action potential. Here, we report computer simulations, using the NEURON simulation programme...
Journal Articles
Journal:
Journal of Experimental Biology
J Exp Biol (2005) 208 (11): 2191–2203.
Published: 1 June 2005
... initiation of action potentials in response to stimulation by the MC motor neuron. Loss of cca-1 function decreases the chance that excitatory input from MC will successfully trigger an action potential, and reduces the ability of an animal to take in food. Intracellular voltage recordings demonstrate...
Includes: Supplementary data
Journal Articles
Journal:
Journal of Experimental Biology
J Exp Biol (2004) 207 (5): 841–852.
Published: 15 February 2004
...-inactivated at–30.4 mV, and completely inactivated within 100 ms of depolarization. The inward currents of inner fibres were half-activated at –7.3 mV and half-inactivated at –74.5 mV and completely inactivated within 5 ms of depolarization. Inner muscle fibres were found to support action potentials,while...
Journal Articles
Journal:
Journal of Experimental Biology
J Exp Biol (2003) 206 (9): 1575–1588.
Published: 1 May 2003
... cells could be distinguished from non-bombykal-sensitive cells in each trichoid sensillum because the bombykal-responsive cell always generated the action potentials of larger initial amplitude. The bombykal cell, which was recorded at a defined location within a distal flagellar annulus, can resolve...
Journal Articles
Journal:
Journal of Experimental Biology
J Exp Biol (2003) 206 (2): 223–231.
Published: 15 January 2003
... two additional aspects of pharyngeal behavior. Serotonin decreases the duration of the pharyngeal action potential and enhances activity of the pharyngeal M3 motor neurons. Gramine, a competitive serotonin antagonist, and octopamine have effects opposite to those of serotonin: gramine and octopamine...
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