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Thermoregulation

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https://www.readbyqxmd.com/read/28438982/the-histaminergic-system-is-involved-in-psychological-stress-induced-hyperthermia-in-rats
#1
Battuvshin Lkhagvasuren, Takakazu Oka
The histaminergic system modulates numerous physiological functions such as wakefulness, circadian rhythm, feeding, and thermoregulation. However, it is not yet known if this system is also involved in psychological stress-induced hyperthermia (PSH) and, if so, which histamine (H) receptor subtype mediates the effect. Therefore, we investigated the effects of pretreatments with intraperitoneal injections of mepyramine (an H1 receptor inverse agonist), cimetidine (an H2 receptor antagonist), and ciproxifan (an H3 receptor inverse agonist) on cage-exchange stress-induced hyperthermia (a model of PSH) by monitoring core body temperature (Tc) during both light (10:00 am-12:00 pm) and dark (10:00 pm-12:00 am) phases in conscious, freely moving rats...
April 2017: Physiological Reports
https://www.readbyqxmd.com/read/28437174/more-than-fever-thermoregulatory-responses-to-immunological-stimulation-and-consequences-of-thermoregulatory-strategy-on-innate-immunity-in-gopher-tortoises-gopherus-polyphemus
#2
Jeffrey M Goessling, Craig Guyer, Mary T Mendonça
Organisms possess a range of thermoregulatory strategies that may vary in response to sickness, thereby driving important life-history consequences. Because the immune system is vital to maintaining organism function, understanding the suite of immune responses to infection indicates basic costs and benefits of physiological strategies. Here, we assessed consequences of thermoregulation and seasonality on immune function in both immunologically stimulated and nonstimulated gopher tortoises (Gopherus polyphemus)...
July 2017: Physiological and Biochemical Zoology: PBZ
https://www.readbyqxmd.com/read/28436200/randomised-controlled-trial-shows-that-co-bedding-twins-may-reduce-birth-weight-recovery-delay-parenteral-nutrition-weaning-time-and-hospitalisation
#3
Arnaud Legrand, Anne Frondas, Fabien Aubret, Anne Corre, Cyril Flamant, Laure Simon, Clothilde Desrobert, Jean-Christophe Rozé
AIM: Cobedding describes a technique where premature twins are kept within the same incubator, inside a common cocoon, to prolong the alleged in utero behavioral bond and reduce post-natal stress. However there is no consensus amongst neonatologists regarding any clinical or developmental benefits cobedding may provide, in particular when performed early after the birth. The NEOCOB (NEOnatology & COBedding) trial aimed to assess, for the first time, early cobedding in preterm newborn twins...
April 24, 2017: Acta Paediatrica
https://www.readbyqxmd.com/read/28434746/supplementing-an-immunomodulatory-feed-ingredient-to-modulate-thermoregulation-physiologic-and-production-responses-in-lactating-dairy-cows-under-heat-stress-conditions
#4
T Leiva, R F Cooke, A P Brandão, K M Schubach, L F D Batista, M F Miranda, E A Colombo, R O Rodrigues, J R G Junior, R L A Cerri, J L M Vasconcelos
This study compared vaginal temperature, physiologic, and productive parameters in lactating dairy cows supplemented or not with Omnigen-AF (Phibro Animal Health, Teaneck, NJ) during the summer months in a tropical environment. Thirty-two lactating, primiparous (n = 16) and multiparous (n = 16) pregnant Holstein × Gir cows were ranked by parity, days in milk, body weight, and body condition score (BCS), and assigned to receive (SUPP; n = 16) or not (CON; n = 16) Omnigen-AF (Phibro Animal Health, Teaneck, NJ) at 56 g/cow daily (as-fed basis)...
April 20, 2017: Journal of Dairy Science
https://www.readbyqxmd.com/read/28432150/specialist-generalist-model-of-body-temperature-regulation-can-be-applied-on-the-intraspecific-level
#5
Anna S Przybylska, Jan S Boratyński, Michał S Wojciechowski, Małgorzata Jefimow
According to theoretical predictions endothermic homeotherms can be classified as either thermal specialists and thermal generalists. In high cost environments thermal specialists are supposed to be more prone to use facultative heterothermy than generalists. We tested this hypothesis on the intraspecific level using laboratory male mice (C57BL/cmdb) fasted under different thermal conditions (20 and 10°C), and for different time periods (12-48 h). We predicted that variability of body temperature (Tb) and time spent with Tb below normothermy increase with the increase of environmental demands (duration of fasting and cold)...
April 21, 2017: Journal of Experimental Biology
https://www.readbyqxmd.com/read/28425422/mass-mortality-of-eastern-box-turtles-with-upper-respiratory-disease-following-atypical-cold-weather
#6
Mickey Agha, Steven J Price, A Justin Nowakowski, Ben Augustine, Brian D Todd
Emerging infectious diseases cause population declines in many ectotherms, with outbreaks frequently punctuated by periods of mass mortality. It remains unclear, however, whether thermoregulation by ectotherms and variation in environmental temperature is associated with mortality risk and disease progression, especially in wild populations. Here, we examined environmental and body temperatures of free-ranging eastern box turtles Terrapene carolina during a mass die-off coincident with upper respiratory disease...
April 20, 2017: Diseases of Aquatic Organisms
https://www.readbyqxmd.com/read/28422539/the-effect-of-nitrate-supplementation-on-cycling-performance-in-the-heat-in-well-trained-cyclists
#7
Joseph A McQuillan, Julia R Casadio, Deborah K Dulson, Paul B Laursen, Andrew E Kilding
PURPOSE: The aim of this study was to determine the effect of NO3(-) consumption on measures of perception, thermoregulation and cycling performance in hot conditions. METHODS: Using a randomised, double-blind, crossover-design, 8 well-trained cyclists (mean ± SD: age: 25 ± 8 y, V̇O2peak: 64 ± 5 ml·kg(-1)·min(-1)) performed 2 separate trials, in hot (35°C, 60% relative humidity) environments, having ingested either 140 ml NO3(-)-rich beetroot juice ~8 mmol NO3(-) (NIT), or placebo (PLA), daily for 3-days with a 7-day washout period separating trials...
April 19, 2017: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/28421269/thermal-balance-of-nellore-cattle
#8
Cíntia Carol de Melo Costa, Alex Sandro Campos Maia, Sheila Tavares Nascimento, Carolina Cardoso Nagib Nascimento, Marcos Chiquitelli Neto, Vinícius de França Carvalho Fonsêca
This work aimed at characterizing the thermal balance of Nellore cattle from the system of indirect calorimetry using a facial mask. The study was conducted at the Animal Biometeorology Laboratory of the São Paulo State University, Jaboticabal, Brazil. Five male Nellore weighing 750 ± 62 kg, at similar ages and body conditions were distributed in four 5 × 5 Latin squares (5 days of records and five schedules) during 20 days. Physiological and environmental measurements were obtained from the indirect calorimetry system using a facial mask...
April 18, 2017: International Journal of Biometeorology
https://www.readbyqxmd.com/read/28420550/effect-of-a-moderate-caffeine-dose-on-endurance-cycle-performance-and-thermoregulation-during-prolonged-exercise-in-the-heat
#9
Ross E Beaumont, Lewis J James
OBJECTIVES: This study investigated the influence of a moderate caffeine dose on endurance cycle performance and thermoregulation during prolonged exercise in high ambient temperature. DESIGN: Double-blind cross-over study. METHODS: Eight healthy, recreationally active males (mean±SD; age: 22±1 years; body mass: 71.1±8.5kg; VO2peak: 55.9±5.8mLkg(-1)min(-1); Wmax: 318±37W) completed one VO2peak test, one familiarisation trial and two experimental trials...
March 31, 2017: Journal of Science and Medicine in Sport
https://www.readbyqxmd.com/read/28412531/vagus-nerve-is-involved-in-the-changes-in-body-temperature-induced-by-intragastric-administration-of-1-8-cineole-via-trpm8-in-mice
#10
Tomomi Urata, Noriyuki Mori, Tsutomu Fukuwatari
Transient Receptor Potential Melastatin 8 (TRPM8) is a cold receptor activated by mild cold temperature (<28°C). TRPM8 expressed in cutaneous sensory nerves is involved in cold sensation and thermoregulation. TRPM8 mRNA is detected in various tissues, including the gastrointestinal mucosa, and in the vagal afferent nerve. The relationship between vagal afferent nerve-specific expression of TRPM8 and thermoregulation remains unclear. In this study, we aimed to investigate whether TRPM8 expression in the vagal afferent nerve is involved in autonomic thermoregulation...
April 12, 2017: Neuroscience Letters
https://www.readbyqxmd.com/read/28406486/promoting-teamwork-may-improve-infant-care-processes-during-delivery-room-management-florida-perinatal-quality-collaborative-s-approach
#11
M Balakrishnan, N Falk-Smith, L A Detman, B Miladinovic, W M Sappenfield, J S Curran, T L Ashmeade
BACKGROUND: LOCAL PROBLEM: Inadequate understanding of compliance with standardized evidence-based DR management. INTERVENTIONS: Promote inter-professional teamwork and a bundle of interventions focusing on resuscitation team roles, equipment check, and debriefing using QI methodology. Optimize delivery room (DR) management to achieve 10-min SPO2 targets, delayed-cord clamping (DCC), team role assignment and debriefings in >50% of deliveries, and achieve normothermia in >75% of infants...
April 13, 2017: Journal of Perinatology: Official Journal of the California Perinatal Association
https://www.readbyqxmd.com/read/28401293/how-low-can-you-go-an-adaptive-energetic-framework-for-interpreting-basal-metabolic-rate-variation-in-endotherms
#12
REVIEW
David L Swanson, Andrew E McKechnie, François Vézina
Adaptive explanations for both high and low body mass-independent basal metabolic rate (BMR) in endotherms are pervasive in evolutionary physiology, but arguments implying a direct adaptive benefit of high BMR are troublesome from an energetic standpoint. Here, we argue that conclusions about the adaptive benefit of BMR need to be interpreted, first and foremost, in terms of energetics, with particular attention to physiological traits on which natural selection is directly acting. We further argue from an energetic perspective that selection should always act to reduce BMR (i...
April 11, 2017: Journal of Comparative Physiology. B, Biochemical, Systemic, and Environmental Physiology
https://www.readbyqxmd.com/read/28398581/agricultural-landscape-and-pesticide-effects-on-honey-bee-hymenoptera-apidae-biological-traits
#13
Mohamed Alburaki, Sandra J Steckel, Matthew T Williams, John A Skinner, David R Tarpy, William G Meikle, John Adamczyk, Scott D Stewart
Sixteen honey bee (Apis mellifera L.) colonies were placed in four different agricultural landscapes to study the effects of agricultural landscape and exposure to pesticides on honey bee health. Colonies were located in three different agricultural areas with varying levels of agricultural intensity (AG areas) and one nonagricultural area (NAG area). Colonies were monitored for their performance and productivity for one year by measuring colony weight changes, brood production, and colony thermoregulation...
April 8, 2017: Journal of Economic Entomology
https://www.readbyqxmd.com/read/28384421/beetle-exoskeleton-may-facilitate-body-heat-acting-differentially-across-the-electromagnetic-spectrum
#14
Luis M Carrascal, Yolanda Jiménez Ruiz, Jorge M Lobo
Exoskeletons of beetles and their associated morphological characteristics can serve many different functions, including thermoregulation. We study the thermal role of the exoskeleton in 13 Geotrupidae dung beetle species using heating experiments under controlled conditions. The main purpose was to measure the influence of heating sources (solar radiance vs. infrared), animal position (dorsal exposure vs. ventral exposure), species identity, and phylogenetic relationships on internal asymptotic temperatures and heating rates...
May 2017: Physiological and Biochemical Zoology: PBZ
https://www.readbyqxmd.com/read/28379961/mapping-black-panthers-macroecological-modeling-of-melanism-in-leopards-panthera-pardus
#15
Lucas G da Silva, Kae Kawanishi, Philipp Henschel, Andrew Kittle, Arezoo Sanei, Alexander Reebin, Dale Miquelle, Andrew B Stein, Anjali Watson, Laurence Bruce Kekule, Ricardo B Machado, Eduardo Eizirik
The geographic distribution and habitat association of most mammalian polymorphic phenotypes are still poorly known, hampering assessments of their adaptive significance. Even in the case of the black panther, an iconic melanistic variant of the leopard (Panthera pardus), no map exists describing its distribution. We constructed a large database of verified records sampled across the species' range, and used it to map the geographic occurrence of melanism. We then estimated the potential distribution of melanistic and non-melanistic leopards using niche-modeling algorithms...
2017: PloS One
https://www.readbyqxmd.com/read/28374542/to-eat-or-get-heat-behavioral-trade-offs-between-thermoregulation-and-feeding-in-gregarious-necrophagous-larvae
#16
Jana Podhorna, Cindy Aubernon, Marie Borkovcova, Julien Boulay, Valery Hedouin, Damien Charabidze
The thermoregulation behavior of Lucilia sericata larvae (Diptera: Calliphoridae), a necrophagous species that feeds on vertebrate cadavers, was investigated. These larvae require high heat incomes to develop, and can elevate temperatures by forming large aggregates. We hypothesized that L. sericata larvae should continue to feed at temperatures up to 38°C, which can be reached inside larval masses. Thermal regulation behavior such as movement between a hot food spot and colder areas was also postulated. The hypotheses were tested by tracking for 1h the activity of single, starved third instar larvae in a Petri dish containing one food spot (FS) that was heated to a constant temperature of 25°C, 34°C or 38°C with an ambient temperature of 25°C...
April 4, 2017: Insect Science
https://www.readbyqxmd.com/read/28374069/mu-and-kappa-opioid-receptors-of-the-periaqueductal-gray-stimulate-and-inhibit-thermogenesis-respectively-during-psychological-stress-in-rats
#17
Caroline Cristina-Silva, Victor Martins, Luciane H Gargaglioni, Kênia C Bícego
The periaqueductal gray matter (PAG) is rich in mu and kappa opioid receptors, and this system is involved in thermoregulation, analgesia, and defensive behaviors. No study approached the involvement of the PAG opioids in body temperature (Tb) regulation during psychological stress such as restraint. Because activation of mu and kappa receptors increases and reduces Tb, respectively, we tested the hypothesis that they exert excitatory and inhibitory modulation, respectively, of the restraint-induced fever in rats...
April 4, 2017: Pflügers Archiv: European Journal of Physiology
https://www.readbyqxmd.com/read/28365313/transcriptome-analysis-provides-insights-into-hepatic-responses-to-moderate-heat-stress-in-the-rainbow-trout-oncorhynchus-mykiss
#18
Yongjuan Li, Jinqiang Huang, Zhe Liu, Yanjing Zhou, Binpeng Xia, Yongjie Wang, Yujun Kang, Jianfu Wang
The rainbow trout is an economically important fish in the world. The limited stress tolerance of this species to high summer-like temperatures usually leads to mass mortality and great economic loss. However, there is limited information on the mechanisms underlying moderate heat responses in the liver of the rainbow trout. Here, we performed transcriptome profiling of rainbow trout liver under moderate heat stress by using the Hiseq™ 4000 sequencing platform. >277 million clean reads were obtained from 6 libraries and aligned against the rainbow trout genome...
March 29, 2017: Gene
https://www.readbyqxmd.com/read/28358505/temperature-responsive-ionic-liquids-fundamental-behaviors-and-catalytic-applications
#19
Yunxiang Qiao, Wenbao Ma, Nils Theyssen, Chen Chen, Zhenshan Hou
Temperature-responsive ionic liquids (ILs), their fundanmental behaviors, and catalytic applications were introduced, especially the concepts of upper critical solution temperature (UCST) and lower critical solution temperature (LCST). It is described that, during a catalytic reaction, they form a homogeneous mixture with the reactants and products at reaction temperature but separate from them afterward at ambient conditions. It is shown that this behavior offers an effective alternative approach to overcome gas/liquid-solid interface mass transfer limitations in many catalytic transformations...
March 30, 2017: Chemical Reviews
https://www.readbyqxmd.com/read/28355309/the-differential-expression-of-mc1r-regulators-in-dorsal-and-ventral-quail-plumages-during-embryogenesis-implications-for-plumage-pattern-formation
#20
Thanh-Lan Gluckman, Nicholas I Mundy
Melanin pigmentation patterns are ubiquitous in animals and function in crypsis, physical protection, thermoregulation and signalling. In vertebrates, pigmentation patterns formed over large body regions as well as within appendages (hair/feathers) may be due to the differential distribution of pigment producing cells (melanocytes) and/or regulation of the melanin synthesis pathway. We took advantage of the pigmentation patterns of Japanese quail embryos (pale ventrum and patterned feathers dorsally) to explore the role of genes and their transcripts in regulating the function of the melanocortin-1-receptor (MC1R) via 1...
2017: PloS One
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