... of Biologists Ltd 2018 http://www.biologists.com/user-licence-1-1/ Summary: In Pacific spiny dogfish, cardiorespiratory synchrony only occurs during progressive hyperoxia post-atropine, when heart rate is uninhibited and ventilation is slowed owing to the increase in available oxygen...

...N. A. Curtin; F. Lou; R. C. Woledge SUMMARY The mechanical performance of red and white muscle fibres from dogfish was compared during a long series of contractions with sinusoidal movement or under isometric conditions at 12°C (normal in vivo temperature). Power output was measured during...

...Chris M. Wood; Makiko Kajimura; Carol Bucking; Patrick J. Walsh SUMMARY In order to study the physiological consequences of voluntary feeding in the gastrointestinal tract of a ureotelic marine elasmobranch, dogfish (fasted for 96 h) were sampled at various times up to 360 h after consuming a 5–6...

... dogfish. To further investigate this putative base-secretive process we performed similar experiments with the addition of colchicine, an inhibitor of cytoskeleton-dependent cellular trafficking processes. Blood pH and plasma total CO 2 were significantly higher in the colchicines-treated,HCO 3 - -infused...

...Martin Tresguerres; Fumi Katoh; Heather Fenton; Edyta Jasinska; Greg G. Goss SUMMARY To study the mechanisms of branchial acid-base regulation, Pacific spiny dogfish were infused intravenously for 24 h with either HCl (495± 79μmol kg -1 h -1 ) or NaHCO 3 (981±235μmol kg -1 h -1 ). Infusion of HCl...

...Paolo Domenici; Emily M. Standen; Robert P. Levine SUMMARY The locomotor performance of dogfish during escape responses was observed by means of high-speed video. Dogfish show C-type escape responses that are comparable with those shown previously in teleosts. Dogfish show high variability...

... urea transporter (UT) in the kidney of the dogfish Triakis scyllia . We isolated a cDNA encoding a UT that is homologous to the facilitative UT cloned from another dogfish species, Squalus acanthias . The Triakis UT mRNA is abundantly expressed in the kidney, while low levels of expression were...

... of the calcium-sensing receptor, relaxing the rectal gland artery and permitting salt secretion by the rectal gland tubules. * Author for correspondence (e-mail: [email protected] ) 17 4 2002 © The Company of Biologists Limited 2002 2002 dogfish Squalus acanthias norepinephrine...

...F. Lou; N. A. Curtin; R. C. Woledge SUMMARY Maximum isometric tetanic force produced by bundles of red muscle fibres from dogfish, Scyliorhinus canicula (L.), was 142.4±10.3 kN m -2 ( N =35 fibre bundles); this was significantly less than that produced by white fibres 289.2±8.4 kN m -2 ( N =25...

.../hyperosmoregulatory strategy. * e-mail: [email protected] 28 1 2002 © The Company of Biologists Limited 2002 2002 elasmobranch hypovolaemia hyperosmoraemia drinking rate dogfish Scyliorhinus canicula Triakis scyllia Drinking has long been established as an essential...

... relative contributions of CO 2 versus H + in promoting the cardiorespiratory responses of dogfish ( Squalus acanthias ) and Atlantic salmon ( Salmo salar ) to hypercarbia and to evaluate the relative contributions of externally versus internally oriented receptors in dogfish. In dogfish, the preferential...

...S. F. Perry; K. M. Gilmour; N. J. Bernier; C. M. Wood ABSTRACT In vivo experiments were conducted on spiny dogfish ( Squalus acanthias ) and rainbow trout ( Oncorhynchus mykiss ) in sea water to determine the potential role of externally oriented or gill boundary layer carbonic anhydrase in carbon...

... the dogfish Scyliorhinus canicula . Heat production was also measured because the sum of work and heat is equivalent to the energy cost of the contraction (ATP used). These energy fluxes were evaluated in contractions with constant-velocity shortening either during stimulation or during relaxation. The muscle...

... increase was greatly reduced by covering the artificial muscle with a Teflon film. Experiments on living muscle from the dogfish Scyliorhinus canicula showed that muscle temperature was higher 2 min after a series of 20 twitches at 3 Hz if the muscle was not covered by Teflon than if it was covered...

... fibres isolated from dogfish Scyliorhinus canicula were used to characterize the force–velocity relationship of the contractile component (CC) and the stress–strain relationship of the passive, elastic component (SEC) in series with the CC. A simple model of the time course of crossbridge activation...

...N. A. Curtin; M. J. Kushmerick; R. W. Wiseman; R. C. Woledge ABSTRACT Recovery after contraction of white muscle fibres of dogfish was investigated using 31 P-NMR and measurements of heat production. The muscle fibres were stimulated to perform either a single isometric tetanus or a series of brief...

...F. Lou; N. A. Curtin; R. C. Woledge ABSTRACT The energetic cost of activation was measured during an isometric tetanus of white muscle fibres from the dogfish Scyliorhinus canicula . The total heat production by the fibres was taken as a measure of the total energetic cost. This energy consists...

... from the SR. This apparent difference in myocardial excitation–contraction (E–C) coupling was investigated further by determining DHPR and RyR densities in ventricular homogenate preparations from rat, trout, dogfish and hagfish. DHPR B max values (means ± S.E.M.) were highest in rat (0.30±0.01 pmol mg...

...N. A. Curtin; R. C. Woledge ABSTRACT Work and heat production of white myotomal muscle fibres from dogfish were measured during sinusoidal movement (0.71–5.0 Hz) at 12 ˚C. Stimulus phase (stimulus timing relative to movement) and duty cycle (stimulus duration as a fraction of movement cycle...

...Chris. M. Wood; Peter Pärt; Patricia A. Wright ABSTRACT Nitrogenous waste excretion in resting dogfish occurred largely (>90 %) as urea-nitrogen (urea-N) efflux across the gills, with a very small urea efflux via the kidney. Ammonia excretion, almost entirely at the gills, accounted for less...