... at cold temperatures, and its response to increased demands, depends on exposure duration; and suggest that AS does not constrain swimming capacity in salmon when chronically exposed to temperatures approaching their lower limit. * Author for correspondence ( [email protected] ) Competing...

...Sulayman A. Lyons; Grant B. McClelland ABSTRACT Highland native deer mice ( Peromyscus maniculatus ) have greater rates of lipid oxidation during maximal cold challenge in hypoxia (hypoxic cold-induced V̇ O 2 ,max ) compared with their lowland conspecifics. Lipid oxidation is also increased in deer...

... facing metabolic trade-offs (reduced energy supply/increased energy demand) favor a regulated hypothermic response at the expense of fever. To test this hypothesis, we compared 5 day old broiler chicks exposed to fasting, cold (25°C), and fasting combined with cold with a control group fed under...

... exchange ratio Cutaneous Gas exchange Calorimetry Cold Amphibian Indirect calorimetry, commonly referred to as respirometry, is a technique used to measure the oxygen uptake ( V̇ O 2 ) and/or carbon dioxide emission ( V̇ CO 2 ) of animals and is used as a common proxy for energy...

... might greatly differ in terms of oxidative costs. We used a cold challenge to investigate the oxidative stress consequences of an increased metabolism achieved either by the activation of an uncoupled mechanism (i.e. UCP1 activity) in the brown adipose tissue (BAT) of wild-type mice or by ATP-dependent...

... absorptive demand. We measured absorption of l -arabinose, intestinal size and gene expression of several tight junction proteins (claudin-2, claudin-4, claudin-15 and ZO-1) at three time points: pre-exposure, and after 1 day and 2 weeks of cold exposure. Cold exposure increased food intake by 62% after 2...

...Agnieszka K. Dymowska; Thomas Manfredi; Joshua J. C. Rosenthal; Brad A. Seibel SUMMARY In ectotherms living in cold waters, locomotory performance is constrained by a slower generation of the ATP that is needed to fuel muscle contraction. Both polar and temperate pteropods of the genus Clione...

... to cold acclimation. Mechanisms involved in avian NST are still unclear but may involve reduced energetic coupling in skeletal muscle mitochondria through the expression of an avian homologue of mammalian uncoupling proteins. The aim of this work was to investigate whether the expression of avian...

...,respectively. The gill transcriptome profiles revealed that ionoregulation-related genes were highly upregulated in cold-acclimated zebrafish. This paved the way to investigate the role of ionoregulatory genes in zebrafish gills during cold acclimation. Cold acclimation caused upregulation of genes...

...H. Battam; M. A. Chappell; W. A. Buttemer SUMMARY Heat generated by the specific dynamic action (SDA) associated with feeding is known to substitute for the thermoregulatory costs of cold-exposed endotherms; however, the effectiveness of this depends on food temperature. When food is cooler than...

...Vesna Petrović; Biljana Buzadžić; Aleksandra Korać; Ana Vasilijević; Aleksandra Janković; Ksenija Mićunović; Bato Korać SUMMARY Early in cold acclimation (1–7 days), heat is produced by shivering,while late in cold acclimation (12–45 days), skeletal muscle contributes to thermogenesis...

.... Allele frequencies at the enzyme locus phosphoglucose isomerase (PGI) vary across a climatic latitudinal gradient in these populations, with PGI allele 1 being most common in cooler regions and PGI allele 4 in warmer ones. PGI genotypes differ in heat and cold tolerance and in expression of a 70 kDa heat...

...David L. Swanson; Eric T. Liknes SUMMARY Small birds showing marked seasonal changes in cold tolerance also exhibit winter increases in summit metabolic rate ( M sum =maximum cold-induced thermogenesis or thermogenic capacity) relative to summer birds. However, some birds show modest seasonal...

... receiving l -arginine ( l -Arg; 2.25%) or N -nitro- l -arginine methyl ester ( l -NAME; 0.01%)as a drinking liquid and maintained at low (4±1°C) or room(22±1°C) temperature for 45 days. Cold generally diminished both iNOS immunopositivity and protein level in IBAT, as well as the rate of apoptosis. Among...