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Keywords: diffusion
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Journal Articles
J Exp Biol (2017) 220 (23): 4432–4439.
Published: 01 December 2017
...Edward P. Snelling; Rebecca Duncker; Karl K. Jones; Erinn P. Fagan-Jeffries; Roger S. Seymour ABSTRACT Flying insects have the highest mass-specific metabolic rate of all animals. Oxygen is supplied to the flight muscles by a combination of diffusion and convection along the internal air-filled...
Journal Articles
J Exp Biol (2015) 218 (2): 170–175.
Published: 15 January 2015
... be overcome by either diffusion gas exchange within the burrow or some means of capturing wind energy to power steady or quasi-steady bulk flows of air through it. Both are examples of what may be called ‘DC’ models, namely steady to quasi-steady flows powered by steady to quasi-steady winds. Natural...
Includes: Supplementary data
Journal Articles
J Exp Biol (2012) 215 (13): 2301–2307.
Published: 01 July 2012
...Berlizé Groenewald; Stefan K. Hetz; Steven L. Chown; John S. Terblanche SUMMARY Gas exchange dynamics in insects is of fundamental importance to understanding evolved variation in breathing patterns, such as discontinuous gas exchange cycles (DGCs). Most insects do not rely solely on diffusion for...
Journal Articles
J Exp Biol (2012) 215 (6): 1017–1030.
Published: 15 March 2012
...George A. Jackson Summary The interactions between planktonic organisms and their aquatic environment are mediated by diffusive processes on the scale of millimeters and smaller. The uptake of nutrients and food and the release of metabolic products creates localized patchiness that diffusive...
Journal Articles
J Exp Biol (2011) 214 (2): 263–274.
Published: 15 January 2011
...Stephen T. Kinsey; Bruce R. Locke; Richard M. Dillaman Summary Metabolic processes are often represented as a group of metabolites that interact through enzymatic reactions, thus forming a network of linked biochemical pathways. Implicit in this view is that diffusion of metabolites to and from...
Journal Articles
J Exp Biol (2010) 213 (16): 2713–2725.
Published: 15 August 2010
...Gerolf Gros; Beatrice A. Wittenberg; Thomas Jue SUMMARY Myoglobin, a mobile carrier of oxygen, is without a doubt an important player central to the physiological function of heart and skeletal muscle. Recently, researchers have surmounted technical challenges to measure Mb diffusion in the living...
Journal Articles
J Exp Biol (2008) 211 (20): 3214–3225.
Published: 15 October 2008
...Ana Gabriela Jimenez; Bruce R. Locke; Stephen T. Kinsey SUMMARY We examined the influence of intracellular diffusion of O 2 and high-energy phosphate (HEP) molecules on the scaling with body mass of the post-exercise whole-animal rate of O 2 consumption( V̇ O 2 ) and muscle arginine phosphate (AP...
Journal Articles
J Exp Biol (2008) 211 (5): 798–804.
Published: 01 March 2008
...H. Arthur Woods; Amy L. Moran SUMMARY The Southern Ocean is one of the coldest, most stable marine environments on Earth and represents a unique environment for investigating metabolic consequences of low temperature. Here we test predictions of a new diffusion–reaction model of O 2 distributions...
Journal Articles
J Exp Biol (2007) 210 (20): 3505–3512.
Published: 15 October 2007
...Stephen T. Kinsey; Kristin M. Hardy; Bruce R. Locke SUMMARY A fundamental principle of physiology is that cells are small in order to minimize diffusion distances for O 2 and intracellular metabolites. In skeletal muscle, it has long been recognized that aerobic fibers that are used for steady...
Journal Articles
J Exp Biol (2006) 209 (18): 3610–3620.
Published: 15 September 2006
... diffusion in giant muscle fibers of the spiny lobster, Panulirus argus. J. Exp. Biol. 205 , 3377 -3386. Kinsey, S. T., Penke, B., Locke, B. R. and Moerland, T. S. ( 1999 ). Diffusional anisotropy is induced by subcellular barriers in skeletal muscle. NMR Biomed. 11 , 1 -7. Kinsey, S. T...
Journal Articles
J Exp Biol (2005) 208 (14): 2641–2652.
Published: 15 July 2005
... small crabs have fiber diameters that are typical of most cells (<60 μm) while in adult animals the fibers are giant (>600 μm). Thus, as the animals grow, their muscle fibers cross and greatly exceed the surface area to volume ratio( SA : V ) and intracellular diffusion distance threshold that is...
Journal Articles
J Exp Biol (2004) 207 (25): 4393–4405.
Published: 01 December 2004
... along different paths by diffusion. The present study made use of the oxygen-sensitive phosphorescence probe Oxyphor R2 to analyze the internal oxygen pathway in the transparent microcrustacean Daphnia magna . Oxyphor R2 was injected into the circulatory system and the distribution of oxygen partial...
Journal Articles
J Exp Biol (2004) 207 (23): 4045–4056.
Published: 01 November 2004
... Moerland, T. S. ( 1999 ). Diffusional anisotropy is induced by subcellular barriers in skeletal muscle. NMR Biomed. 11 , 1 -7. Kinsey, S. T. and Moerland, T. S. ( 2002 ). Metabolite diffusion in giant muscle fibers of the spiny lobster, Panulirus argus. J. Exp. Biol. 205 , 3377 -3386...
Journal Articles
J Exp Biol (2004) 207 (4): 683–696.
Published: 01 February 2004
... ventilatory and circulatory system diffusion convection mathematical modelling To cope with fluctuations in ambient oxygen tension( P O 2amb ), oxyregulating water breathers must respond with appropriate adjustments of their ventilatory and circulatory systems. Systemic regulation enables these...
Journal Articles
J Exp Biol (2003) 206 (12): 2001–2009.
Published: 15 June 2003
... catalytic `perfection': any further improvement in the enzyme's efficiency would not be expressed in higher reaction rates because it would be limited by diffusion-based enzyme–substrate encounter. Most metabolic pathways also contain allosteric enzymes that function under quite different conditions and...
Journal Articles
J Exp Biol (2003) 206 (12): 2021–2029.
Published: 15 June 2003
... analysis of pathways. This approach has served biology well and continues to be useful. Here, we consider the diffusion of small and large molecules in muscles and energy metabolism in the context of intracellular space. We find that in attempting to explain certain phenomena, a purely kinetic paradigm...
Journal Articles
J Exp Biol (2003) 206 (12): 2073–2082.
Published: 15 June 2003
...-induced membrane recruitment of the cytoplasmic protein SOS results in the activation of the Ras/MAPK cascade. It has been suggested that the membrane recruitment of signaling proteins causes an increase in the diffusion-limited rates. We have recently shown that this increase is too small to be...
Journal Articles
J Exp Biol (2003) 206 (12): 1955–1961.
Published: 15 June 2003
... argued that it is only in the `dead' state that diffusion reigns supreme in the body and the cell. If this is so, it follows that if we stop all convection inside the cell, it will be completely reliant on diffusional activity, and the question is raised of whether any level of metabolic activity that...
Journal Articles
J Exp Biol (2002) 205 (21): 3377–3386.
Published: 01 November 2002
...Stephen T. Kinsey; Timothy S. Moerland SUMMARY The time- and orientation-dependence of metabolite diffusion in giant muscle fibers of the lobster Panulirus argus was examined using 31 P- and 1 H-pulsed-field gradient nuclear magnetic resonance. The 31 P resonance for arginine phosphate and the 1 H...
Journal Articles
J Exp Biol (2002) 205 (6): 769–779.
Published: 15 March 2002
... derived from stereological analysis of electron micrographs, mean fibre P O 2 was calculated on the basis of temperature-corrected rates of mitochondrial respiration and oxygen diffusion. The mean muscle fibre diameter (MFD) among Antarctic notothenioids was in the range 17–61 μm and mitochondrial volume...