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Thermoregulation

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https://www.readbyqxmd.com/read/29334694/home-alone-a-systematic-review-and-meta-analysis-on-the-effects-of-individual-housing-on-body-weight-food-intake-and-visceral-fat-mass-in-rodents
#1
REVIEW
L Schipper, L Harvey, E M van der Beek, G van Dijk
Rats and mice are widely used to study environmental effects on psychological and metabolic health. Study designs differ widely and are often characterized by varying (social) housing conditions. In itself, housing has a profound influence on physiology and behaviour of rodents, affecting energy balance and sustainable metabolic health. However, evidence for potential long-term consequences of individual versus social housing on body weight and metabolic phenotype is inconsistent. We conducted a systematic literature review and meta-analyses assessing effects of individual versus social housing of rats and mice, living under well-accepted laboratory conditions, on measures of metabolic health, including body weight, food intake and visceral adipose tissue mass...
January 15, 2018: Obesity Reviews: An Official Journal of the International Association for the Study of Obesity
https://www.readbyqxmd.com/read/29323578/effects-of-black-cohosh-and-estrogen-on-core-body-and-tail-skin-temperatures-in-ovariectomized-rats-by-telemetric-monitoring-with-dual-thermistor-probes
#2
Y Sun, L H Qin, X Chen, X Yan, L Mao, W Bai, J Kang
OBJECTIVES: To investigate the effects of black cohosh and estrogen on the temperature in ovariectomized rats, the core body temperature (CBT) and tail-skin temperature (TST) were simultaneously monitored and the relationship between these two temperatures was explored. METHODS: Twenty-four female Sprague-Dawley rats aged 8 weeks were randomly divided into four groups: sham-operated (SHAM), ovariectomized (OVX), OVX treated with estradiol valerate (OVX + E), and OVX treated with isopropanolic black cohosh extract (OVX + ICR)...
January 11, 2018: Climacteric: the Journal of the International Menopause Society
https://www.readbyqxmd.com/read/29323241/integrative-approach-using-liver-and-duodenum-rna-seq-data-identifies-candidate-genes-and-pathways-associated-with-feed-efficiency-in-pigs
#3
Yuliaxis Ramayo-Caldas, Maria Ballester, Juan Pablo Sánchez, Olga González-Rodríguez, Manuel Revilla, Henry Reyer, Klaus Wimmers, David Torrallardona, Raquel Quintanilla
This study aims identifying candidate genes and pathways associated with feed efficiency (FE) in pigs. Liver and duodenum transcriptomes of 37 gilts showing high and low residual feed intake (RFI) were analysed by RNA-Seq. Gene expression data was explored through differential expression (DE) and weighted gene co-expression network analyses. DE analysis revealed 55 and 112 differentially regulated genes in liver and duodenum tissues, respectively. Clustering genes according to their connectivity resulted in 23 (liver) and 25 (duodenum) modules of genes with a co-expression pattern...
January 11, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29319645/improving-thermoregulation-for-trauma-patients-in-the-emergency-department-an-evidence-based-practice-project
#4
(no author information available yet)
No abstract text is available yet for this article.
January 2018: Journal of Trauma Nursing: the Official Journal of the Society of Trauma Nurses
https://www.readbyqxmd.com/read/29319644/improving-thermoregulation-for-trauma-patients-in-the-emergency-department-an-evidence-based-practice-project
#5
Ada Saqe-Rockoff, Finn D Schubert, Amanda Ciardiello, Elizabeth Douglas
Extensive evidence exists on the association between hypothermia and increased morbidity and mortality in trauma patients. Gaps in practice related to temperature assessment have been identified in literature, along with limited personnel knowledge regarding management of patients with accidental hypothermia. An interdisciplinary team identified gaps in practice in our institution regarding temperature assessment and documentation of rewarming and initiated an evidence-based practice project to change practice at our institution...
January 2018: Journal of Trauma Nursing: the Official Journal of the Society of Trauma Nurses
https://www.readbyqxmd.com/read/29316302/oxygen-supply-did-not-affect-how-lizards-responded-to-thermal-stress
#6
Agustin Camacho Guerrero, John M VandenBrooks, Angela Riley, Rory S Telemeco, Michael J Angilletta
Zoologists rely on mechanistic niche models of behavioral thermoregulation to understand how animals respond to climate change. These models predict that species will need to disperse to higher altitudes to persist in a warmer world. However, thermal stress and thus thermoregulatory behavior may depend on atmospheric oxygen as well as environmental temperatures. Severe hypoxia causes animals to prefer lower body temperatures, which could be interpreted as evidence that oxygen supply limits heat tolerance. Such a constraint could prevent animals from successfully dispersing to high elevations during climate change...
January 9, 2018: Integrative Zoology
https://www.readbyqxmd.com/read/29311229/integrated-analysis-of-proteomic-and-transcriptomic-data-highlights-late-fetal-muscle-maturation-process
#7
Valentin Voillet, Magali San Cristobal, Marie-Christine Pere, Yvon Billon, Laurianne Canario, Laurence Liaubet, Louis Lefaucheur
BACKGROUND: In pigs, the perinatal period is the most critical time for survival. Piglet maturation, which occurs at the end of gestation, leads to a state of full development after birth. Maturity is thus an important determinant of early survival. Skeletal muscle plays a key role in adaptation to extra-uterine life, e.g. motor function and thermoregulation. Progeny from two breeds with extreme neonatal mortality rates were analyzed at 90 and 110 days of gestation (dg). The Large White breed is a highly selected breed for lean growth with a high rate of mortality at birth, whereas the Chinese Meishan breed is fatter and more robust and has a low mortality rate...
January 8, 2018: Molecular & Cellular Proteomics: MCP
https://www.readbyqxmd.com/read/29310661/temperature-elevation-in-the-human-brain-and-skin-with-thermoregulation-during-exposure-to-rf-energy
#8
Sachiko Kodera, Jose Gomez-Tames, Akimasa Hirata
BACKGROUND: Two international guidelines/standards for human protection from electromagnetic fields define the specific absorption rate (SAR) averaged over 10 g of tissue as a metric for protection against localized radio frequency field exposure due to portable devices operating below 3-10 GHz. Temperature elevation is suggested to be a dominant effect for exposure at frequencies higher than 100 kHz. No previous studies have evaluated temperature elevation in the human head for local exposure considering thermoregulation...
January 8, 2018: Biomedical Engineering Online
https://www.readbyqxmd.com/read/29308244/hovering-in-the-heat-effects-of-environmental-temperature-on-heat-regulation-in-foraging-hummingbirds
#9
Donald R Powers, Kathleen M Langland, Susan M Wethington, Sean D Powers, Catherine H Graham, Bret W Tobalske
At high temperature (greater than 40°C) endotherms experience reduced passive heat dissipation (radiation, conduction and convection) and increased reliance on evaporative heat loss. High temperatures challenge flying birds due to heat produced by wing muscles. Hummingbirds depend on flight for foraging, yet inhabit hot regions. We used infrared thermography to explore how lower passive heat dissipation during flight impacts body-heat management in broad-billed (Cynanthus latirostris, 3.0 g), black-chinned (Archilochus alexandri, 3...
December 2017: Royal Society Open Science
https://www.readbyqxmd.com/read/29305466/thermoregulatory-postures-limit-antipredator-responses-in-peafowl
#10
Jessica L Yorzinski, Jennifer Lam, Rachel Schultz, Melissa Davis
Many animals inhabit environments where they experience temperature fluctuations. One way in which animals can adjust to these temperature changes is through behavioral thermoregulation. However, we know little about the thermal benefits of postural changes and the costs they may incur. In this study, we examined the thermoregulatory role of two postures, the head-tuck and leg-tuck posture, in peafowl (Pavo cristatus) and evaluated whether the head-tuck posture imposes a predation cost. The heads and legs of peafowl are significantly warmer when the birds exhibit these postures, demonstrating that these postures serve an important thermoregulatory role...
January 5, 2018: Biology Open
https://www.readbyqxmd.com/read/29301701/thermoregulatory-challenges-in-the-habitat-of-the-world-s-smallest-tortoise-chersobius-signatus
#11
Victor J T Loehr
Ectotherms have various means of dealing with low environmental temperatures, but relatively few species have been rigorously investigated. Consequently, we have little information to predict how ectotherm populations might respond to global temperature changes. Tortoises from temperate and subtropical regions often overcome periodically cool conditions by hibernation, but speckled dwarf tortoises (Chersobius signatus) need to remain active to exploit ephemeral resources in their arid winter-rainfall habitat...
January 2018: Journal of Thermal Biology
https://www.readbyqxmd.com/read/29301693/the-relation-between-melanism-and-thermal-biology-in-a-colour-polymorphic-bush-cricket-isophya-rizeensis
#12
Arda Cem Kuyucu, Mehmet Kursat Sahin, Selim Sualp Caglar
According to the thermal melanism hypothesis, darker coloured melanic individuals heat up faster and to higher temperatures than lighter coloured individuals due to lower skin reflectance. Consequently, it is assumed that darker melanic types may be advantageous compared to light coloured types in colder regions. As temperature gradually decreases with elevation and latitude the degree of melanism is expected to increase along these gradients in ectothermic species. Isophya rizeensis, a colour polymorphic bush cricket species endemic to Northeastern Turkey is an interesting case since the degree of melanism decreases with elevation, contrary to the thermal melanism hypothesis...
January 2018: Journal of Thermal Biology
https://www.readbyqxmd.com/read/29301686/is-there-an-effect-of-environmental-temperature-on-the-response-to-an-antigen-and-the-metabolic-rate-in-pups-of-the-rodent-octodon-degus
#13
Natalia Ramirez-Otarola, Janyra Espinoza, Alexis M Kalergis, Pablo Sabat
Environmental temperature is a variable that influences all aspects of organisms, from physiological, e.g. immune function, and morphological traits to behavior. Recent studies have reported that environmental temperature modulates organisms' thermoregulatory capacity and immune response, suggesting that trade-offs must be made between thermoregulation and immune function. Despite this, studies that evaluate this trade-off in developing endotherms are scarce. The aim of this study was to evaluate the effects of environmental temperature experienced during development on the response to an antigen and its energetic costs in the precocial rodent Octodon degus...
January 2018: Journal of Thermal Biology
https://www.readbyqxmd.com/read/29301680/moderate-intensity-exercise-induced-catecholamine-release-in-the-preoptic-area-and-anterior-hypothalamus-in-rats-is-enhanced-in-a-warm-environment
#14
Xinyan Zheng, Satomi Takatsu, Ryo Ishikawa, Hiroshi Hasegawa
Thermoeffector responses and core body temperature (Tcore) homeostasis during exercise are affected by both ambient temperature and exercise intensity. We have previously reported that Tcore, heat loss responses, and catecholamine release in the preoptic area and anterior hypothalamus (PO/AH) increased during incremental treadmill running. However, no previous study has examined whether changes in the thermoregulatory responses at warm ambient temperature are related to catecholamine responses during moderate intensity exercise in rats...
January 2018: Journal of Thermal Biology
https://www.readbyqxmd.com/read/29301043/seasonality-of-insulin-resistance-glucose-and-insulin-among-middle-aged-and-elderly-population-the-rotterdam-study
#15
Magda Cepeda, Taulant Muka, M Arfan Ikram, Oscar H Franco, Josje D Schoufour
Context: There are discrepancies in the seasonality of insulin resistance (IR) across the literature, probably due to age-related differences in the seasonality of lifestyle factors and thermoregulation mechanisms. Objective: To estimate the seasonality of IR according to the homeostatic model assessment-insulin resistance (HOMA-IR), glucose, and insulin levels; and to examine the role of lifestyle markers (body mass index (BMI) and physical activity) and meteorological factors, according to age...
December 28, 2017: Journal of Clinical Endocrinology and Metabolism
https://www.readbyqxmd.com/read/29299251/the-more-the-merrier-conspecific-density-improves-performance-of-gregarious-larvae-and-reduces-susceptibility-to-a-pupal-parasitoid
#16
Elena Rosa, Saskya van Nouhuys, Marjo Saastamoinen
Aggregation can confer advantages in animal foraging, defense, and thermoregulation. There is a tight connection between the evolution of insect sociality and a highly effective immune system, presumably to inhibit rapid disease spread in a crowded environment. This connection is less evident for animals that spend only part of their life cycle in a social environment, such as noneusocial gregarious insects. Our aim was to elucidate the effects of group living by the gregarious larvae of the Glanville fritillary butterfly with respect to individual performance, immunity, and susceptibility to a parasitoid...
December 2017: Ecology and Evolution
https://www.readbyqxmd.com/read/29291081/modelling-the-emergence-of-rodent-filial-huddling-from-physiological-huddling
#17
Stuart P Wilson
Huddling behaviour in neonatal rodents reduces the metabolic costs of physiological thermoregulation. However, animals continue to huddle into adulthood, at ambient temperatures where they are able to sustain a basal metabolism in isolation from the huddle. This 'filial huddling' in older animals is known to be guided by olfactory rather than thermal cues. The present study aimed to test whether thermally rewarding contacts between young mice, experienced when thermogenesis in brown adipose fat tissue (BAT) is highest, could give rise to olfactory preferences that persist as filial huddling interactions in adults...
November 2017: Royal Society Open Science
https://www.readbyqxmd.com/read/29284184/disparate-patterns-of-thermal-adaptation-between-life-stages-in-temperate-vs-tropical-drosophila-melanogaster
#18
Brent L Lockwood, Tarun Gupta, Rosemary Scavotto
Many terrestrial ectothermic species exhibit limited variation in upper thermal tolerance across latitude. However, these trends may not signify limited adaptive capacity to increase thermal tolerance in the face of climate change. Instead, thermal tolerance may be similar among populations because behavioral thermoregulation by mobile organisms or life stages may buffer natural selection for thermal tolerance. We compared thermal tolerance of adults and embryos among natural populations of Drosophila melanogaster from a broad range of thermal habitats around the globe to assess natural variation of thermal tolerance in mobile vs...
December 28, 2017: Journal of Evolutionary Biology
https://www.readbyqxmd.com/read/29284051/morphological-and-colour-morph-clines-along-an-altitudinal-gradient-in-the-meadow-grasshopper-pseudochorthippus-parallelus
#19
Günter Köhler, Jörg Samietz, Holger Schielzeth
Many animals show altitudinal clines in size, shape and body colour. Increases in body size and reduction in the length of body appendices in colder habitats are usually attributed to improved heat conservation at lower surface-to-volume ratios (known as Bergmann's and Allen's rule, respectively). However, the patterns are more variable and sometimes reversed in small ectotherms that are affected by shortened growing seasons. Altitude can also affect colouration. The thermal melanism hypothesis predicts darker colours under cooler conditions because of a thermoregulatory advantage...
2017: PloS One
https://www.readbyqxmd.com/read/29282354/using-polyethylene-plastic-bag-to-prevent-moderate-hypothermia-during-transport-in-very-low-birth-weight-infants-a-randomized-trial
#20
Xiao-Jing Hu, Li Wang, Ru-Yi Zheng, Tian-Chan Lv, Yu-Xia Zhang, Yun Cao, Guo-Ying Huang
OBJECTIVE: Hypothermia remains a significant problem among very low birth weight (VLBW) infants. The use of occlusive polyethylene plastic bags immediately after birth has been proven to be effective for preterm infants to reduce hypothermia. This study aims to determine whether placing VLBW infants in plastic bags during transport reduces hypothermia. STUDY DESIGN: Study infants were randomly assigned to a standard thermoregulation protocol or to a standard thermoregulation protocol with placement of the torso and lower extremities inside a polyethylene plastic bag during transport...
December 27, 2017: Journal of Perinatology: Official Journal of the California Perinatal Association
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