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Keywords: action potential
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Journal Articles
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
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
J Exp Biol (2021) 224 (16): jeb242778.
Published: 24 August 2021
... Summary: Contraction of the python heart is initiated by pacemaker cells in the region 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...
Journal Articles
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
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
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
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
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
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
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
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
J Exp Biol (2013) 216 (13): 2459–2468.
Published: 1 July 2013
.... , Fay R. R. ), pp. 360 - 409 . New York, NY : Springer . Alle H. , Roth A. , Geiger J. R. P. ( 2009 ). Energy-efficient action potentials in hippocampal mossy fibers . Science 325 , 1405 - 1408 . Assad C. , Rasnow B. , Stoddard P. K. ( 1999...
Journal Articles
J Exp Biol (2006) 209 (16): 3091–3100.
Published: 15 August 2006
...; 0.75 mg ml -1 ) were added to this solution. The external solution used for measuring ventricular action potentials (AP)contained (mmol l -1 ): NaCl 150, KCl 3, MgSO 4 1.2,NaH 2 PO 4 1.2, CaCl 2 1.8, glucose 10 and Hepes 10, adjusted to pH 7.6 with NaOH. The external solution used for measuring K...
Journal Articles
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
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
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
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
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...
Journal Articles
J Exp Biol (2002) 205 (23): 3641–3650.
Published: 1 December 2002
... for correspondence at present address: School of Biomedical Sciences,University of Leeds, Leeds, LS2 9JT, UK (e-mail: hollys@sfu.ca ) 21 8 2002 © The Company of Biologists Limited 2002 2002 L-type Ca 2+ current (I Ca ) calcium transient sarcoplasmic reticulum action potential frequency fish...
Journal Articles
J Exp Biol (2002) 205 (12): 1819–1830.
Published: 15 June 2002
...Joshua J. C. Rosenthal; Francisco Bezanilla SUMMARY To determine which physiological properties contribute to temperature adaptation in the squid giant axon, action potentials were recorded from four species of squid whose habitats span a temperature range of 20°C. The environments of these species...