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Keywords: Rana pipiens
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Journal Articles
J Exp Biol (2013) 216 (15): 2908–2916.
Published: 1 August 2013
... a role. Using the northern leopard frog, Rana pipiens, we show here that injection of noradrenaline (norepinephrine) brings about a long-term depletion of skin peptides (initial concentrations do not recover until after day 56). When peptide stores recovered, the renewed peptides were similar...
Journal Articles
J Exp Biol (2005) 208 (6): 1117–1124.
Published: 15 March 2005
... 2005 2005 anoxia bone buffering Ca 2+ exercise lactic acid leopard frog Rana pipiens Exhaustive exercise and environmental hypoxia or anoxia lead to metabolic acidosis in amphibians, characterized by acidemia, decreased plasma bicarbonate and increased blood and tissue lactate...
Journal Articles
J Exp Biol (2005) 208 (6): 1201–1208.
Published: 15 March 2005
... size, or high thyroxine or mitochondrial content. standard metabolic rate thyroxine mitochondria leopard frog Rana pipiens As an index of metabolic rate, we measured carbon dioxide production of postabsorptive leopard frogs at 22°C for 24 h under constant light conditions using an open...
Journal Articles
J Exp Biol (2004) 207 (22): 3945–3958.
Published: 15 October 2004
... (DPIV) to quantify the flow structure of the wake produced by the feet during the propulsion phase of the kick of surface swimming frogs( Rana pipiens ). These frogs use two different gaits, asynchronous and synchronous kicking, and the magnitude of the thrust produced by the feet differs between...
Includes: Multimedia, Supplementary data
Journal Articles
J Exp Biol (2004) 207 (16): 2787–2791.
Published: 15 July 2004
... on the ascending limb of the force–length relationship. Twenty-nine stretch experiments on ten single fibres from the lumbrical muscle of the frog Rana pipiens were carried out on the ascending limb of the force–length relationship. Force enhancement was observed in 28 out of the 29 tests. Moreover, the force...
Journal Articles
J Exp Biol (2004) 207 (8): 1361–1368.
Published: 15 March 2004
..., cineradiography, electromyography and nerve transection experiments to evaluate the contribution of eye retraction to swallowing in the northern leopard frog, Rana pipiens . Behavioral observations of frogs feeding on 1.5 cm long crickets reveal a high degree of variability in eye retraction and swallowing. Eye...
Includes: Multimedia, Supplementary data
Journal Articles
J Exp Biol (2003) 206 (22): 4021–4028.
Published: 15 November 2003
... and 3-4 h anoxic frog Rana pipiens , in order to determine whether their neurotransmitter responses resemble the anoxia-vulnerable or anoxia-tolerant response. Increases in whole brain serine, glycine, alanine and GABA levels were similar to those seen in anoxia-tolerant species, although the levels...
Journal Articles
J Exp Biol (2002) 205 (14): 1987–2004.
Published: 15 July 2002
... of a realistic model of the frog Rana pipiens . We measured the anatomical properties of 13 proximal muscles in the frog hindlimb and incorporated these measurements into a set of musculotendon actuators. We examined whether the interaction between this musculotendon subsystem and a previously developed skeleton...
Journal Articles
J Exp Biol (2002) 205 (12): 1683–1702.
Published: 15 June 2002
... may have evolved specifically to extend the limits of performance. Little is known about how the joints of the frog contribute to and limit jumping performance. To address these issues, we developed a skeletal model of the frog Rana pipiens that contained realistic bones, joints and body-segment...
Journal Articles
J Exp Biol (2001) 204 (24): 4237–4248.
Published: 15 December 2001
...Gordon J. Lutz; Shannon N. Bremner; Michael J. Bade; Richard L. Lieber SUMMARY Isoforms of myosin heavy chain (MHC) and myosin light chain (MLC) influence contractile kinetics of skeletal muscle. We previously showed that the four major skeletal muscle fibre types in Rana pipiens (type 1, type 2...
Journal Articles
J Exp Biol (2001) 204 (20): 3547–3551.
Published: 15 October 2001
... neuronal death. The few species that survive brain anoxia for days or months, such as the freshwater turtle Trachemys scripta , avoid anoxic depolarization and maintain brain ATP levels through a coordinated downregulation of brain energy demand processes. The frog Rana pipiens represents an intermediate...
Journal Articles
J Exp Biol (1990) 154 (1): 537–556.
Published: 1 November 1990
...TIMOTHY ZOLTAN VITALIS; GRAHAM SHELTON The mechanism and pattern of ventilation in unrestrained Rana pipiens were investigated by simultaneous measurements of pulmonary pressure, buccal pressure and air flow at the nostrils. The buccal cavity was ventilated continuously at a rate of 90...