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Thermoregulation

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https://www.readbyqxmd.com/read/28734790/organ-weights-and-histopathology-of-double-crested-cormorants-phalacrocorax-auritus-dosed-orally-or-dermally-with-artificially-weathered-mississippi-canyon-252-crude-oil
#1
Kendal E Harr, Drury R Reavill, Steven J Bursian, Dave Cacela, Fred L Cunningham, Karen M Dean, Brian S Dorr, Katie C Hanson-Dorr, Kate Healy, Katherine Horak, Jane E Link, Susan Shriner, Robert E Schmidt
A series of toxicity tests were conducted to assess the effects of low to moderate exposure to artificially weathered Deepwater Horizon Mississippi Canyon 252 crude oil on representative avian species as part of the Natural Resource Damage Assessment. The present report summarizes effects of oral exposure (n=26) of double-crested cormorants (DCCO; Phalacrocorax auritus) to 5 or 10ml oil kg(-1) day(-1) for up to 21 days or dermal application (n=25) of 13ml oil to breast and back feathers every three days totaling 6 applications in 21 days on organ weights and histopathology...
July 19, 2017: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/28726791/implementation-of-a-multidisciplinary-guideline-improves-preterm-infant-admission-temperatures
#2
M W Harer, B Vergales, T Cady, A Early, C Chisholm, J R Swanson
BACKGROUND: Hypothermia is a common problem in preterm infants immediately following delivery.Local problem:The rate of admission hypothermia in our neonatal intensive care unit (NICU) was above the rate of comparable NICUs in the Vermont Oxford Network. METHODS: To reduce the rate of preterm admission hypothermia, a quality improvement (QI) project was implemented, utilizing the plan-do-study-act (PDSA) methodology. A guideline for delivery room thermoregulation management in <35-week infants at the University of Virginia was created and put into practice by a multidisciplinary team...
July 20, 2017: Journal of Perinatology: Official Journal of the California Perinatal Association
https://www.readbyqxmd.com/read/28726024/thermal-physiology-of-three-sympatric-and-syntopic-liolaemidae-lizards-in-cold-and-arid-environments-of-patagonia-argentina
#3
F Duran, E L Kubisch, Jorgelina M Boretto
The thermal physiology determines the whole biology of ectotherm organisms, by limiting their acquisition and allocation of resources. Herein, we aim to add knowledge on how different species use the thermal resources when they coexist in a habitat, studying the thermal physiology of three sympatric and syntopic liolaemid lizards, Phymaturus querque, Phymaturus zapalensis, and Liolaemus elongatus during the summer season. We measured the body temperatures at capture places, the operative microenvironmental temperatures in the field, and the preferred body temperature in an experimental thermal gradient in the laboratory...
July 19, 2017: Journal of Comparative Physiology. B, Biochemical, Systemic, and Environmental Physiology
https://www.readbyqxmd.com/read/28716184/oxygen-isotopes-suggest-elevated-thermometabolism-within-multiple-permo-triassic-therapsid-clades
#4
Kévin Rey, Romain Amiot, François Fourel, Fernando Abdala, Frédéric Fluteau, Nour-Eddine Jalil, Jun Liu, Bruce S Rubidge, Roger Mh Smith, J Sébastien Steyer, Pia A Viglietti, Xu Wang, Christophe Lécuyer
The only true living endothermic vertebrates are birds and mammals, which produce and regulate their internal temperature quite independently from their surroundings. For mammal ancestors, anatomical clues suggest that endothermy originated during the Permian or Triassic. Here we investigate the origin of mammalian thermoregulation by analysing apatite stable oxygen isotope compositions (δ(18)Op) of some of their Permo-Triassic therapsid relatives. Comparing of the δ(18)Op values of therapsid bone and tooth apatites to those of co-existing non-therapsid tetrapods, demonstrates different body temperatures and thermoregulatory strategies...
July 18, 2017: ELife
https://www.readbyqxmd.com/read/28714085/neural-control-of-sweat-secretion-a-review
#5
REVIEW
Y Hu, C Converse, M C Lyons, W H Hsu
Humans have 4 million exocrine sweat glands, which can be classified into two types: eccrine and apocrine glands. Sweat secretion is a constitutive feature, which is directly involved in thermoregulation and metabolism. Sweat secretion is regulated by both the central nervous system(1) and autonomic nervous system.(2) In peripheral areas, the ANS, especially the sympathetic nervous system (SNS), mediates the transmission of neurotransmitters to sweat glands. Two principal chemical mediators, acetylcholine and noradrenaline (NA)/adrenaline (ADR), are released by the SNS, which stimulate sweat secretion...
July 17, 2017: British Journal of Dermatology
https://www.readbyqxmd.com/read/28712483/corrigendum-to-improvements-in-scrotal-thermoregulation-in-patients-with-varicoceles-treated-by-using-traditional-korean-medicine-two-case-reports-j%C3%A2-acupunct-meridian-stud-9-3-2016-156-160
#6
Junyoung Jo, Hyunho Kim, Ui Min Jerng
No abstract text is available yet for this article.
June 2017: Journal of Acupuncture and Meridian Studies
https://www.readbyqxmd.com/read/28711354/the-roles-of-metabolic-thermogenesis-in-body-fat-regulation-in-striped-hamsters-fed-high-fat-diet-at-different-temperatures
#7
Lu-Lu Shi, Wei-Jia Fan, Ji-Ying Zhang, Xiao-Ya Zhao, Song Tan, Jing Wen, Jing Cao, Xue-Ying Zhang, Qing-Sheng Chi, De-Hua Wang, Zhi-Jun Zhao
The metabolic thermogenesis plays important roles in thermoregulation, and it may be also involved in body fat regulation. The thermogenesis of brown adipose tissue (BAT) is largely affected by ambient temperature, but it is unclear if the roles in body fat regulation are dependent on the temperature. In the present study, uncoupling protein 1 (ucp1)-based BAT thermogenesis, energy budget and body fat content were examined in the striped hamsters fed high fat diet (HF) at cold (5°C) and warm (30°C) temperatures...
July 12, 2017: Comparative Biochemistry and Physiology. Part A, Molecular & Integrative Physiology
https://www.readbyqxmd.com/read/28700095/smaller-beaks-for-colder-winters-thermoregulation-drives-beak-size-evolution-in-australasian-songbirds
#8
Nicholas R Friedman, Lenka Harmáčková, Evan P Economo, Vladimír Remeš
Birds' beaks play a key role in foraging, and most research on their size and shape has focused on this function. Recent findings suggest that beaks may also be important for thermoregulation, and this may drive morphological evolution as predicted by Allen's rule. However, the role of thermoregulation in the evolution of beak size across species remains largely unexplored. In particular, it remains unclear whether the need for retaining heat in the winter or dissipating heat in the summer plays the greater role in selection for beak size...
July 12, 2017: Evolution; International Journal of Organic Evolution
https://www.readbyqxmd.com/read/28697018/the-renaissance-man-of-burn-surgery-basil-a-pruitt-jr
#9
Karel D Capek, Guillermo Foncerrada, R Patrick Clayton, Michaela Sljivich, Charles D Voigt, Gabriel Hundeshagen, Janos Cambiaso-Daniel, Craig Porter, Ashley Guillory, David N Herndon
Dr. Basil A. Pruitt Jr., a consummate clinical and translational surgeon-scientist, has been spent over half a century at the forefront of an advancing standard of burn care. Commanding the US Army Institute for Surgical Research in San Antonio, he trained generations of leading burn clinicians and allied scientists. At his direction, there were forged discoveries in resuscitation from shock, treatment of inhalation injury, control of burn-related infections, prevention of iatrogenic complications, and understanding the sympathetic, endocrine, and immune responses to burn injury...
July 8, 2017: Journal of Trauma and Acute Care Surgery
https://www.readbyqxmd.com/read/28696940/multiple-selective-events-at-the-prdm16-functional-pathway-shaped-adaptation-of-western-european-populations-to-different-climate-conditions
#10
Andrea Quagliarello, Sara De Fanti, Cristina Giuliani, Paolo Abondio, Patrizia Serventi, Stefania Sarno, Marco Sazzini, Donata Luiselli
Several studies highlighted the role of climate in shaping many human evolutionary processes. This occurred even in relatively recent times, having affected various human phenotypic traits, among which metabolic processes that orchestrate absorption and accumulation of substances to maintain energy homeostasis, that is critical for the survival of individuals in high energy-expenditure environments. To date, most researches have focalized on detection of climatic influence on SNPs' frequency in populations exposed to extreme environmental conditions or by comparing variation patterns between populations from different continents...
July 10, 2017: Journal of Anthropological Sciences, Rivista di Antropologia: JASS
https://www.readbyqxmd.com/read/28694517/the-lateral-parabrachial-nucleus-but-not-the-thalamus-mediates-thermosensory-pathways-for-behavioural-thermoregulation
#11
Takaki Yahiro, Naoya Kataoka, Yoshiko Nakamura, Kazuhiro Nakamura
Thermoregulatory behaviour, such as migration to a comfortable thermal environment, is a representative innate animal behaviour and facilitates effective autonomic regulation of body temperature with a reduced cost of resources. Here we determine the central thermosensory ascending pathway that transmits information on environmental temperature from cutaneous thermoreceptors to elicit thermoregulatory behaviour. To examine the contribution of the spinothalamocortical pathway, which is known to mediate thermosensory transmission for perception of skin temperature, we lesioned thalamic regions mediating this pathway in rats...
July 10, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28689725/phylogenetic-analysis-of-the-allometry-of-metabolic-rate-and-mitochondrial-basal-proton-leak
#12
Elias T Polymeropoulos, R Oelkrug, C R White, M Jastroch
The mitochondrial basal proton leak (MBPL) significantly contributes to high body temperatures (Tb) and basal metabolic rates (BMR) in endotherms. In endotherms at a given body mass (M), liver MBPL is higher than in ectotherms, supporting the notion that MBPL may partly explain the evolutionary increase in metabolic rate (MR), fostering endothermy. Here, we re-addressed this assumption by performing a phylogenetic analysis comparing all available liver MBPL data for ecto- and endotherms. While MBPL within endotherms negatively scales with M and BMR as shown previously, MBPL of ectotherms does not scale allometrically with M...
August 2017: Journal of Thermal Biology
https://www.readbyqxmd.com/read/28689724/thermal-biology-in-two-syntopic-lizards-phymaturus-extrilidus-and-liolaemus-parvus-in-the-puna-region-of-argentina
#13
Rodrigo Gómez Alés, Juan Carlos Acosta, Alejandro Laspiur
Body temperature is the most important ecophysiological variable affecting reptiles' life history. Moreover, thermoregulation in ectotherms implies a struggle to reach preferred temperatures in natural conditions due to the influence of biotic and abiotic factors. Our objective was to evaluate and compare the thermal biology of two syntopic species, Phymaturus extrilidus and Liolaemus parvus, in the Puna region of San Juan, Argentina. We determined body temperature (Tb), micro-environmental temperatures (Ta and Ts) and operative temperatures (Te) in the field...
August 2017: Journal of Thermal Biology
https://www.readbyqxmd.com/read/28689717/compensation-of-thermal-constraints-along-a-natural-environmental-gradient-in-a-malagasy-iguanid-lizard-oplurus-quadrimaculatus
#14
Ole Theisinger, W Berg, K H Dausmann
Physiological or behavioural adjustments are a prerequisite for ectotherms to cope with different thermal environments. One of the world's steepest environmental gradients in temperature and precipitation can be found in southeastern Madagascar. This unique gradient allowed us to study the compensation of thermal constraints in the heliothermic lizard Oplurus quadrimaculatus on a very small geographic scale. The lizard occurs from hot spiny forest to intermediate gallery and transitional forest to cooler rain forest and we investigated whether these habitat differences are compensated behaviourally or physiologically...
August 2017: Journal of Thermal Biology
https://www.readbyqxmd.com/read/28689303/direct-calorimetry-a-brief-historical-review-of-its-use-in-the-study-of-human-metabolism-and-thermoregulation
#15
REVIEW
Glen P Kenny, Sean R Notley, Daniel Gagnon
Direct calorimetry is the gold standard means of measuring human metabolic rate and its use has been fundamental for understanding metabolism in health and disease. While metabolic rate is now more commonly estimated indirectly from measures of the oxygen consumed during respiration, direct calorimetry provides the user with the unique capacity to quantify the heat produced from aerobic and anaerobic metabolism by measuring heat exchange between the body and the environment. This review provides a brief historical overview of the fundamental concepts which underlie direct calorimetry, of pioneer scientists which developed these concepts into functional pieces of equipment and the subsequent use of direct calorimetry to advance our understanding of energy balance, nutrition, and the pathogenesis of metabolic diseases...
July 8, 2017: European Journal of Applied Physiology
https://www.readbyqxmd.com/read/28686927/servo-controlled-versus-manual-cooling-methods-in-neonates-with-hypoxic-ischemic-encephalopathy
#16
Ashok Buchiboyina, Eric Ma, Andrew Yip, Deepika Wagh, Jason Tan, Judy McMichael, Max Bulsara, Shripada Rao
BACKGROUND: Therapeutic hypothermia is known to improve outcomes in neonates with hypoxic ischemic encephalopathy (HIE). There are no studies that have compared servo controlled cooling (SCC) versus manually controlled cooling (MCC) methods in HIE. AIM: To compare the outcomes of SCC versus MCC in neonates with HIE. METHODS AND OUTCOME MEASURES: Between Jan 2008 and May 2011, MCC with cool-gel packs was used to achieve rectal temperatures of 33...
July 4, 2017: Early Human Development
https://www.readbyqxmd.com/read/28684465/avian-thermoregulation-in-the-heat-resting-metabolism-evaporative-cooling-and-heat-tolerance-in-sonoran-desert-songbirds
#17
Eric Krabbe Smith, Jacqueline J O'Neill, Alexander R Gerson, Andrew E McKechnie, Blair O Wolf
We examined thermoregulatory performance in seven Sonoran Desert passerine bird species varying in body mass from 10 to 70g - Lesser Goldfinch, House Finch, Pyrrhuloxia, Cactus Wren, Northern Cardinal, Abert's Towhee and Curve-billed Thrasher. Using flow-through respirometry we measured daytime resting metabolism, evaporative water loss and body temperature at air temperatures (Tair) between 30° and 52°C. We found marked increases in resting metabolism above the upper critical temperature (Tuc), which for six of the seven species fell within a relatively narrow range (36...
July 6, 2017: Journal of Experimental Biology
https://www.readbyqxmd.com/read/28678857/effects-of-a-compound-from-the-group-of-substituted-thiadiazines-with-hypothermia-inducing-properties-on-brain-metabolism-in-rats-a-study-in-vivo-and-in-vitro
#18
O B Shevelev, N B Illarionova, D V Petrovski, A P Sarapultsev, O N Chupakhin, M P Moshkin
The aim of the present study was to examine how administration of a compound of 1,3,4- thiadiazine class 2-morpholino-5-phenyl-6H-1,3,4-thiadiazine, hydrobromide (L-17) with hypothermia inducing properties affects the brain metabolism. The mechanism by which L-17 induces hypothermia is unknown; it may involve hypothalamic central thermoregulation as well as act via inhibition of energy metabolism. We tested the hypothesis that L-17 may induce hypothermia by directly inhibiting energy metabolism. The study in vivo was carried out on Sprague-Dawley adult rats...
2017: PloS One
https://www.readbyqxmd.com/read/28663858/infrared-radiative-properties-and-thermal-modeling-of-ceramic-embedded-textile-fabrics
#19
David M Anderson, John R Fessler, Matthew A Pooley, Scott Seidel, Michael R Hamblin, Haskell W Beckham, James F Brennan
The infrared optical properties of textiles are of great importance in numerous applications, including infrared therapy and body thermoregulation. Tuning the spectral response of fabrics by the engineering of composite textile materials can produce fabrics targeted for use in these applications. We present spectroscopic data for engineered polyester fabric containing varying amounts of ceramic microparticles within the fiber core and report a spectrally-dependent shift in infrared reflectance, transmittance and absorptance...
March 1, 2017: Biomedical Optics Express
https://www.readbyqxmd.com/read/28663093/heat-stress-induced-neuroinflammation-and-aberration-in-monoamine-levels-in-hypothalamus-are-associated-with-temperature-dysregulation
#20
Nishant Ranjan Chauhan, Medha Kapoor, Laxmi Prabha Singh, Rajinder Kumar Gupta, Ramesh Chand Meena, Rajkumar Tulsawani, Sarita Nanda, Shashi Bala Singh
Heat Stress (HS) induces diverse pathophysiological changes, which include brain ischemia, oxidative stress and neuronal damage. The present study was undertaken with the objective to ascertain whether neuroinflammation in Hypothalamus (HTH) caused under HS affects monoamine levels and hence, its physiological role in thermoregulation. Rats were exposed to HS in a heat simulation environmental chamber (Ambient temperature, Ta=45±0.5°C and Relative Humidity, RH=30±10%) with real-time measurement of core temperature (Tc) and skin temperature (Ts)...
June 27, 2017: Neuroscience
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