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Keywords: energy
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Journal Articles
J Exp Biol (2021) 224 (Suppl_1): jeb228031.
Published: 24 February 2021
... variability and change. Separately considering fitness components can clarify organismal responses: fecundity is primarily an integrated, additive response to chronic environmental conditions over time via mechanisms such as energy use and acquisition, whereas survival can be strongly influenced by short-term...
Journal Articles
J Exp Biol (2020) 223 (14): jeb228379.
Published: 22 July 2020
... because such diets reduce glycogen stores and thereby energy expenditure via physical activity. To explore the effect of a low-carbohydrate diet on activity and glycogen utilisation, we fed adult Drosophila melanogaster a standard or low-carbohydrate diet for 9 days and measured patterns of flight...
Includes: Supplementary data
Journal Articles
J Exp Biol (2020) 223 (12): jeb207472.
Published: 26 June 2020
...Nikolaos Papachatzis; Philippe Malcolm; Carl A. Nelson; Kota Z. Takahashi ABSTRACT The human foot serves numerous functional roles during walking, including shock absorption and energy return. Here, we investigated walking with added mass to determine how the foot would alter its mechanical work...
Includes: Supplementary data
Journal Articles
J Exp Biol (2020) 223 (4): jeb208678.
Published: 25 February 2020
... in water than they do in air. Biomechanics Energy Kinematics Power amplification Stomatopod Diverse biological systems, including locusts and mantis shrimp, use latch-mediated, spring-actuated systems to generate movements with incredibly high speeds and mechanical power ( Gronenberg...
Includes: Supplementary data
Journal Articles
J Exp Biol (2019) 222 (13): jeb203877.
Published: 10 July 2019
...–time integral) whenever there is active force. The energetic costs of these functions are important components in the energy budget during locomotion. We investigated how the pattern of stimulation and movement affects the mechanics and energetics of muscle fibre bundles isolated from wild rabbits...
Includes: Supplementary data
Journal Articles
J Exp Biol (2019) 222 (10): jeb199448.
Published: 29 May 2019
..., their metabolic fuel is unknown. Here, we report that NKA- and VHA-rich cells have large glycogen stores. Glycogen abundance in NKA-rich cells was lower in starved sharks compared with 24 h post-fed sharks, reflecting higher energy demand for acid secretion during normal activity and glycogen replenishment during...
Journal Articles
J Exp Biol (2019) 222 (7): jeb198085.
Published: 04 April 2019
...P. A. Green; M. J. McHenry; S. N. Patek ABSTRACT Measurements of energy use, and its scaling with size, are critical to understanding how organisms accomplish myriad tasks. For example, energy budgets are central to game theory models of assessment during contests and underlie patterns of feeding...
Journal Articles
J Exp Biol (2018) 221 (22): jeb187294.
Published: 16 November 2018
... between gripping for prey capture, gripping for dispersal of materials or gripping during reproduction. The second half of the Review is focused on specific physical parameters that influence puncture mechanics, such as material properties, stress, energy, speed and the medium within which puncture occurs...
Journal Articles
J Exp Biol (2018) 221 (22): jeb181834.
Published: 12 November 2018
... ). Derivation of formulae used to calculate energy expenditure in man . Hum. Nutr. Clin. Nutr.   41 , 463 - 471 . Browning , R. C. and Kram , R. ( 2005 ). Energetic cost and preferred speed of walking in obese vs. normal weight women . Obes. Res.   13 , 891 - 899 . 10.1038/oby.2005.103...
Includes: Supplementary data
Journal Articles
J Exp Biol (2018) 221 (3): jeb165373.
Published: 07 February 2018
... are an ecologically essential nutrient. Tree swallows HUFA ALA Energy Nutrients Compound-specific stable isotopes Carbon stable isotope tracer Although dietary resources are crucial for animals throughout their life cycle, energy and nutrients are particularly critical during early life...
Includes: Supplementary data
Journal Articles
J Exp Biol (2017) 220 (23): 4440–4449.
Published: 01 December 2017
... , R 2 =0.858). The choice of metric employed for estimating energy costs (i.e. how costs are expressed) also affects the outcome and any interpretation of costs of sexual signalling. For example, the absolute, relative and cumulative metabolic costs of calling yielded strongly divergent estimates...
Includes: Supplementary data
Journal Articles
J Exp Biol (2012) 215 (8): 1259–1265.
Published: 15 April 2012
... investigated the feeding and energy expenditure for digestion in two flea species Parapulex chephrenis and Xenopsylla ramesis on a principal host ( Acomys cahirinus and Meriones crassus , respectively) and eight auxiliary host species. We predicted that fleas would perform better – that is (i) a higher...
Journal Articles
J Exp Biol (2011) 214 (23): 3972–3976.
Published: 01 December 2011
... in geographic distribution and remain within the continental shelf region where predator pressure is probably relatively constant. For this reason, flatback hatchlings might use only part of their energy reserves during a less vigorous frenzy phase, with lower overall energy expenditure during the first day...
Journal Articles
J Exp Biol (2008) 211 (20): 3266–3271.
Published: 15 October 2008
...M. N. Scholz; M. F. Bobbert; A. J. van Soest; J. R. Clark; J. van Heerden SUMMARY Better running economy (i.e. a lower rate of energy consumption at a given speed) is correlated with superior distance running performance. There is substantial variation in running economy, even among elite runners...
Journal Articles
J Exp Biol (2007) 210 (16): 2843–2850.
Published: 15 August 2007
...% if stretch preceded the shortening phase ( P =0.003). The energy(oxygen) used during a stretch–shorten cycle was the same as for an isometric-shorten contraction ( P =0.34). Likewise, the efficiency of net work (net work/energy used) was only marginally different between shortening contractions preceded...
Journal Articles
J Exp Biol (2007) 210 (8): 1446–1454.
Published: 15 April 2007
... in the field cricket Gryllus bimaculatus . Compared with control (intact) crickets, animals that had autotomised a single hindlimb were slower, stopped more often, moved a shorter distance and expended more energy doing so. Both the cost of locomotion (COT)and minimal cost of locomotion (MCOT) were...
Journal Articles
J Exp Biol (2003) 206 (12): 2039–2047.
Published: 15 June 2003
.... Here, we provide an overview of the role of spatially arranged enzymatic networks, catalyzed by creatine kinase,adenylate kinase, carbonic anhydrase and glycolytic enzymes, in efficient high-energy phosphoryl transfer and signal communication in the cell. Studies of transgenic creatine kinase...
Journal Articles
J Exp Biol (2003) 206 (10): 1631–1642.
Published: 15 May 2003
...James R. Usherwood; John E. A. Bertram SUMMARY Gibbons are able to brachiate effectively through the forest canopy with a suspended swinging motion via contact with handholds. The swing phase is unlikely to be a cause of significant energy loss as pendulums are able to oscillate with only gradual...
Journal Articles
J Exp Biol (2002) 205 (17): 2665–2676.
Published: 01 September 2002
..., the energy cost (C) when swimming with fins was about 40 %lower than when swimming without them; when compared at the same metabolic power, the decrease in C allowed an increase in v of about 0.2 ms -1 . Fins only slightly decrease the amplitude of the kick (by about 10 %) but cause a large reduction (about...
Journal Articles
J Exp Biol (1991) 158 (1): 355–368.
Published: 01 July 1991
... acclimation. For example, the frequency and duration of Key words: birds, Pygoscelis adeliae, hydrodynamics, swimming, drag, implantation devices, tastruments, telemetry, energy, respirometry, power, polar, Antarctic, metabolic rate. 356 B. CULIK AND R. P. WILSON foraging trips were significantly changed...