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Keywords: proton leak
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Journal Articles
J Exp Biol (2020) 223 (15): jeb222513.
Published: 04 August 2020
... (metabolic rate, proton leak, oxidative phosphorylation, maximal mitochondrial capacity and mitochondrial inefficiency). We assessed oxidative damage caused by reactive oxygen species (ROS) metabolites as well as the total non-enzymatic antioxidant protection in plasma. Compared with control nestlings, Cort...
Includes: Supplementary data
Journal Articles
J Exp Biol (2020) 223 (13): jeb226332.
Published: 08 July 2020
... marine ectotherm, the mussel Mytilus edulis , as a model. Mussels from a single cohort that considerably differed in body size were selected, implying faster growth in the larger specimens. We determined the body mass-dependent scaling of the mitochondrial proton leak respiration, respiration...
Journal Articles
J Exp Biol (2016) 219 (11): 1659–1674.
Published: 01 June 2016
... Mitochondria Phosphorylation Proton leak Substrate oxidation Fluctuations in oxygen (O 2 ) availability represent a major challenge to aerobic organisms. The degree of hypoxia tolerance varies among animals, from terrestrial mammals that survive only minutes to hours without O 2 to hypoxia-tolerant...
Includes: Supplementary data
Journal Articles
J Exp Biol (2016) 219 (9): 1356–1362.
Published: 01 May 2016
... 2016 Summary: Variation in performance among individual fish is associated with differences in their mitochondrial leak respiration rate and respiratory control ratio. Ecophysiology Food intake Global warming Proton leak Respiratory control ratio Respiration rate Increasing...
Includes: Supplementary data
Journal Articles
J Exp Biol (2015) 218 (20): 3222–3228.
Published: 01 October 2015
... of radical oxygen species than those from the smaller frogs. Collectively, the data show that key bioenergetics parameters of mitochondria (proton leak, ATP production efficiency and radical oxygen species production) are correlated with body mass in frogs. This research expands our understanding...
Journal Articles
J Exp Biol (2014) 217 (6): 831–840.
Published: 15 March 2014
... and uncoupler-stimulated (state 3u) respiration while concomitantly stimulating states 4 and 4 ol (proton leak) respiration, thus reducing phosphorylation and coupling efficiencies. Low doses of Cd (≤5 μmol l −1 ) reduced, while higher doses enhanced, hypoxia-stimulated proton leak. This was in contrast...
Includes: Supplementary data
Journal Articles
J Exp Biol (2012) 215 (18): 3142–3154.
Published: 15 September 2012
... showed high resilience to transient hypoxia. In control oysters at 20°C, hypoxia/reoxygenation induced elevated flux capacity of all three studied mitochondrial subsystems (substrate oxidation, phosphorylation and proton leak) and resulted in a mild depolarization of resting mitochondria. Elevated proton...
Journal Articles
J Exp Biol (2012) 215 (17): 2992–3000.
Published: 01 September 2012
... sensitivity of mitochondrial substrate oxidation was high for proline and pyruvate but low for succinate. Oxygen efficiency of catabolism rose as temperature changed from 11 to 21°C via shifts to oxygen-conserving oxidation of proline and pyruvate and via reduced relative proton leak. The changes observed...
Includes: Supplementary data
Journal Articles
J Exp Biol (2008) 211 (16): 2689–2699.
Published: 15 August 2008
... metabolism, all animals hibernated with no differences in bout durations, body temperatures or whole-animal metabolic rates among the diet groups. The reduced mitochondrial proton leak in the 15, 35 and 55 mg g –1 18:2 diet groups might compensate for the inability to suppress respiration, permitting whole...
Journal Articles
J Exp Biol (2006) 209 (14): 2678–2685.
Published: 15 July 2006
...Cindy A. Duong; Chugey A. Sepulveda; Jeffrey B. Graham; Kathryn A. Dickson SUMMARY Mitochondrial proton leak was assessed as a potential heat source in the slow, oxidative (red) locomotor muscle and liver of the shortfin mako shark( Isurus oxyrinchus ), a regional endotherm that maintains...
Includes: Supplementary data
Journal Articles
J Exp Biol (2006) 209 (7): 1274–1284.
Published: 01 April 2006
..., Crassostrea virginica (eastern oysters), using oxygen demand for ATP turnover, protein synthesis, mitochondrial proton leak and non-mitochondrial respiration in isolated gill and hepatopancreas cells as demand-side endpoints and mitochondrial oxidation capacity, abundance and fractional volume as supply-side...
Journal Articles
J Exp Biol (2004) 207 (15): 2639–2648.
Published: 01 July 2004
... acclimated at 15°C. It was found that both cadmium and temperature significantly affect mitochondrial function in oysters. Elevated temperature had a rate-enhancing effect on state 3 (ADP-stimulated) and states 4 and 4+ (representative of proton leak) respiration, and the rate of temperature-dependent...
Journal Articles
J Exp Biol (2004) 207 (14): 2529–2538.
Published: 15 June 2004
..., state 4+ respiration was recorded, which comprises the oxygen consumption by the proton leak through the inner mitochondrial membrane, plus the amount of oxygen molecules converted to ROS per unit time( Brand et al., 1994a ; Heise et al., 2003 ). The oxygen solubility (β O 2 ) of the assay medium...
Journal Articles
J Exp Biol (2004) 207 (13): 2305–2311.
Published: 01 June 2004
... production,(ii) mitochondrial proton leak and (iii) non-mitochondrial processes were estimated by using excess amounts of appropriate inhibitors. It was found that although hepatocyte respiration rate varied with body mass in birds, these processes constitute a relatively constant proportion of hepatocyte...
Journal Articles
J Exp Biol (2002) 205 (15): 2287–2296.
Published: 01 August 2002
... skeletal muscle mitochondria proton leak hibernation hypoxia oxyconformation metabolic depression Rana temporaria Metabolic depression is a common organismal response to environmental pressures such as cold, desiccation, hypoxia and food shortage( Hochachka and Guppy, 1987 ; Storey...