keyword
MENU ▼
Read by QxMD icon Read
search

Heat acclimation

keyword
https://www.readbyqxmd.com/read/29156142/cutaneous-vasomotor-adaptation-following-repeated-isothermal-heat-exposures-evidence-of-adaptation-specificity
#1
Sean R Notley, Elizabeth A Taylor, Norikazu Ohnishi, Nigel A S Taylor
Unequivocal enhancement of cutaneous vasomotor function has yet to be demonstrated following heat acclimation, possibly because the adaptation stimulus was not sustained, or because thermoeffector function was not assessed at equivalent deep-body temperatures. Therefore, forearm and local cutaneous vascular conductances were evaluated during exercise eliciting matched deep-body temperatures (37.5oC, 38.5oC), before and after isothermal heat acclimation. Both indices increased (21% and 25%), confirming cutaneous vasomotor adaptation can occur, provided those experimental design specifications are satisfied...
November 20, 2017: Applied Physiology, Nutrition, and Metabolism, Physiologie Appliquée, Nutrition et Métabolisme
https://www.readbyqxmd.com/read/29153170/a-100-year-review-stress-physiology-including-heat-stress
#2
R J Collier, B J Renquist, Y Xiao
Stress is an external event or condition that places a strain on a biological system. The animal response to a stress involves the expenditure of energy to remove or reduce the impact of the stress. This increases maintenance requirements of the animal and results in loss of production. The biological response to stress is divided into acute and chronic phases, with the acute phase lasting hours to a few days and the chronic phase lasting several days to weeks. The acute response is driven by homeostatic regulators of the nervous and endocrine systems and the chronic phase by homeorhetic regulators of the endocrine system...
December 2017: Journal of Dairy Science
https://www.readbyqxmd.com/read/29141954/tropical-drosophila-ananassae-of-wet-dry-seasons-show-cross-resistance-to-heat-drought-and-starvation
#3
Chanderkala Lambhod, Ankita Pathak, Ashok K Munjal, Ravi Parkash
Plastic responses to multiple environmental stressors in wet or dry seasonal populations of tropical Drosophila species have received less attention. We tested plastic effects of heat hardening, acclimation to drought or starvation, and changes in trehalose, proline and body lipids in Drosophila ananassae flies reared under wet or dry season-specific conditions. Wet season flies revealed significant increase in heat knockdown, starvation resistance and body lipids after heat hardening. However, accumulation of proline was observed only after desiccation acclimation of dry season flies while wet season flies elicited no proline but trehalose only...
November 15, 2017: Biology Open
https://www.readbyqxmd.com/read/29134788/thermal-acclimation-in-arabidopsis-lyrata-genotypic-costs-and-transcriptional-changes
#4
Guillaume Wos, Yvonne Willi
Frost and heat events can be challenging for sessile organisms that cannot escape thermal extremes. However, adverse effects of thermal stress on fitness may be reduced by pre-exposure to cold or heat, a process known as acclimation. To understand the ecological and evolutionary implications of acclimation, we investigated (1) the reduction in performance due to stress pre-exposure, (2) the magnitude of increased leaf resistance to subsequent stress, (3) the costs of acclimation, and (4) the genes differing in expression due to stress pre-exposure...
November 13, 2017: Journal of Evolutionary Biology
https://www.readbyqxmd.com/read/29129022/heat-acclimation-decay-and-re-induction-a-systematic-review-and-meta-analysis
#5
REVIEW
Hein A M Daanen, Sebastien Racinais, Julien D Périard
BACKGROUND: Although the acquisition of heat acclimation (HA) is well-documented, less is known about HA decay (HAD) and heat re-acclimation (HRA). The available literature suggests 1 day of HA is lost following 2 days of HAD. Understanding this relationship has the potential to impact upon the manner in which athletes prepare for major competitions, as a HA regimen may be disruptive during final preparations (i.e., taper). OBJECTIVE: The aim of this systematic review and meta-analysis was to determine the rate of HAD and HRA in three of the main physiological adaptations occurring during HA: heart rate (HR), core temperature (T c), and sweat rate (SR)...
November 11, 2017: Sports Medicine
https://www.readbyqxmd.com/read/29122558/optimal-housing-temperatures-for-mice-to-mimic-the-thermal-environment-of-humans-an%C3%A2-experimental-study
#6
Alexander W Fischer, Barbara Cannon, Jan Nedergaard
OBJECTIVES: The laboratory mouse is presently the most common model for examining mechanisms of human physiology and disease. Housing temperatures can have a large impact on the outcome of such experiments and on their translatability to the human situation. Humans usually create for themselves a thermoneutral environment without cold stress, while laboratory mice under standard conditions (≈20° C) are under constant cold stress. In a well-cited, theoretical paper by Speakman and Keijer in Molecular Metabolism, it was argued that housing mice under close to standard conditions is the optimal way of modeling the human metabolic situation...
October 31, 2017: Molecular Metabolism
https://www.readbyqxmd.com/read/29111595/prominent-alterations-of-wild-barley-leaf-transcriptome-in-response-to-individual-and-combined-drought-acclimation-and-heat-shock-conditions
#7
Ahmed Ashoub, Niels Müller, José M Jiménez-Gómez, Wolfgang Brüggemann
Under field conditions, drought and heat stress typically happen simultaneously and their negative impact on the agricultural production is expected to increase worldwide under the climate change scenario. In this study, we performed RNA sequencing analysis on leaves of wild barley (Hordeum spontaneum) originated from the northern coastal region of Egypt following individual drought acclimation (DA) and heat shock (HS) treatments and their combination (CS) to distinguish the unique and shared differentially expressed genes...
November 7, 2017: Physiologia Plantarum
https://www.readbyqxmd.com/read/29109689/molecular-plasticity-under-ocean-warming-proteomics-and-fitness-data-provides-clues-for-a-better-understanding-of-the-thermal-tolerance-in-fish
#8
Diana Madeira, José E Araújo, Rui Vitorino, Pedro M Costa, José L Capelo, Catarina Vinagre, Mário S Diniz
Ocean warming is known to alter the performance and fitness of marine organisms albeit the proteome underpinnings of species thermal tolerance are still largely unknown. In this 1-month experiment we assessed the vulnerability of the gilt-head sea bream Sparus aurata, taken here as a biological model for some key fisheries species, to ocean warming (control 18°C, nursery ground temperature 24°C and heat wave 30°C). Survival was impaired after 28 days, mainly at 30°C although fishes' condition was unaltered...
2017: Frontiers in Physiology
https://www.readbyqxmd.com/read/29108560/the-change-in-metabolic-heat-production-is-a-primary-mediator-of-heat-acclimation-in-adults
#9
Eric Rivas, Manisha Rao, Todd Castleberry, Vic Ben-Ezra
PURPOSE: This study examined whether heat acclimation (HA) results in either predominate improvements in heat dissipation or reduced endogenous heat production via individual components of the human heat balance equation. METHODS: Twelve healthy inactive subjects (5 females, mean ± SD): age 28 ± 6y, 77.9 ± 2kg), completed a 10-day HA (42°C, 28% RH) hyperthermia clamp (90min/day exercise, ∆1.5°C in rectal temperature (Tre)) and control workload matched (CON: 23°C, 42% RH) protocols in a counterbalanced design separated by at least 2 mo...
December 2017: Journal of Thermal Biology
https://www.readbyqxmd.com/read/29103951/low-and-high-thermal-tolerance-characteristics-for-unfed-larvae-of-the-winter-tick-dermacentor-albipictus-acari-ixodidae-with-special-reference-to-moose
#10
Christopher J Holmes, Cameron J Dobrotka, David W Farrow, Andrew J Rosendale, Joshua B Benoit, Peter J Pekins, Jay A Yoder
We report that larvae of the winter tick Dermacentor albipictus, the only stage that will quest for a host, can tolerate short-term cold shock down to -25°C and short-term heat shock as high as 46°C. Unlike a three host-tick, larvae of D. albipictus have no preconditioning response to low or high temperature exposure by rapid cold hardening (RCH) or heat hardening, and poor ability to acclimate to low and high temperature extremes. Thermal tolerance limits were not improved as the result of larval clustering, and there was only a minimal effect due to changes in photoperiod...
October 31, 2017: Ticks and Tick-borne Diseases
https://www.readbyqxmd.com/read/29097716/dynamics-of-coral-associated-bacterial-communities-acclimated-to-temperature-stress-based-on-recent-thermal-history
#11
Jia-Ho Shiu, Shashank Keshavmurthy, Pei-Wen Chiang, Hsing-Ju Chen, Shueh-Ping Lou, Ching-Hung Tseng, Hernyi Justin Hsieh, Chaolun Allen Chen, Sen-Lin Tang
Seasonal variation in temperature fluctuations may provide corals and their algal symbionts varying abilities to acclimate to changing temperatures. We hypothesized that different temperature ranges between seasons may promote temperature-tolerance of corals, which would increase stability of a bacterial community following thermal stress. Acropora muricata coral colonies were collected in summer and winter (water temperatures were 23.4-30.2 and 12.1-23.1 °C, respectively) from the Penghu Archipelago in Taiwan, then exposed to 6 temperature treatments (10-33 °C)...
November 2, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29094278/substrates-of-the-chloroplast-small-heat-shock-proteins-22e-f-point-to-thermolability-as-a-regulative-switch-for-heat-acclimation-in-chlamydomonas-reinhardtii
#12
Mark Rütgers, Ligia Segatto Muranaka, Timo Mühlhaus, Frederik Sommer, Sylvia Thoms, Juliane Schurig, Felix Willmund, Miriam Schulz-Raffelt, Michael Schroda
We have identified 39 proteins that interact directly or indirectly with high confidence with chloroplast HSP22E/F under heat stress thus revealing chloroplast processes affected by heat. Under conditions promoting protein unfolding, small heat shock proteins (sHsps) prevent the irreversible aggregation of unfolding proteins by integrating into forming aggregates. Aggregates containing sHsps facilitate the access of Hsp70 and ClpB/Hsp104 chaperones, which in ATP-dependent reactions disentangle individual proteins from the aggregates and assist in their refolding to the native state...
November 1, 2017: Plant Molecular Biology
https://www.readbyqxmd.com/read/29090427/on-the-origin-of-the-slow-m-t-chlorophyll-a-fluorescence-decline-in-cyanobacteria-interplay-of-short-term-light-responses
#13
Gábor Bernát, Gábor Steinbach, Radek Kaňa, Govindjee, Amarendra N Misra, Ondřej Prašil
The slow kinetic phases of the chlorophyll a fluorescence transient (induction) are valuable tools in studying dynamic regulation of light harvesting, light energy distribution between photosystems, and heat dissipation in photosynthetic organisms. However, the origin of these phases are not yet fully understood. This is especially true in the case of prokaryotic oxygenic photoautotrophs, the cyanobacteria. To understand the origin of the slowest (tens of minutes) kinetic phase, the M-T fluorescence decline, in the context of light acclimation of these globally important microorganisms, we have compared spectrally resolved fluorescence induction data from the wild type Synechocystis sp...
October 31, 2017: Photosynthesis Research
https://www.readbyqxmd.com/read/29080375/plasticity-and-cross-tolerance-to-heterogeneous-environments-divergent-stress-responses-co-evolved-in-an-african-fruit-fly
#14
Nonofo Gotcha, John S Terblanche, Casper Nyamukondiwa
Plastic adjustments of physiological tolerance to a particular stressor can result in fitness benefits for resistance that might manifest not only in that same environment but also be advantageous when faced with alternative environmental stressors, a phenomenon termed 'cross-tolerance'. The nature and magnitude of cross-tolerance responses can provide important insights into the underlying genetic architecture, potential constraints on, or versatility of an organism's stress responses. In this study, we tested for cross-tolerance to a suite of abiotic factors that likely contribute to setting insect population dynamics and geographic range limits: heat, cold, desiccation and starvation resistance in adult Ceratitis rosa following acclimation to all these isolated individual conditions prior to stress assays...
October 28, 2017: Journal of Evolutionary Biology
https://www.readbyqxmd.com/read/29062280/heat-and-dehydration-additively-enhance-cardiovascular-outcomes-following-orthostatically-stressful-calisthenics-exercise
#15
Ashley P Akerman, Samuel J E Lucas, Rajesh Katare, James D Cotter
Exercise and exogenous heat each stimulate multiple adaptations, but their roles are not well delineated, and that of the related stressor, dehydration, is largely unknown. While severe and prolonged hypohydration potentially "silences" the long-term heat acclimated phenotype, mild and transient dehydration may enhance cardiovascular and fluid-regulatory adaptations. We tested the hypothesis that exogenous heat stress and dehydration additively potentiate acute (24 h) cardiovascular and hematological outcomes following exercise...
2017: Frontiers in Physiology
https://www.readbyqxmd.com/read/29045433/integrated-mrna-and-microrna-transcriptome-analyses-reveal-regulation-of-thermal-acclimation-in-gymnocypris-przewalskii-a-case-study-in-tibetan-schizothoracine-fish
#16
Cunfang Zhang, Chao Tong, Fei Tian, Kai Zhao
Environmental acclimation is important episode in wildlife occupation of the high-altitude Tibetan Plateau (TP). Transcriptome-wide studies on thermal acclimation mechanism in fish species are rarely revealed in Tibetan Plateau fish at high altitude. Thus, we used mRNA and miRNA transcriptome sequencing to investigate regulation of thermal acclimation in larval Tibetan naked carp, Gymnocypris przewalskii. We first remodeled the regulation network of mRNA and miRNA in thermal acclimation, and then identified differential expression of miRNAs and target mRNAs enriched in metabolic and digestive pathways...
2017: PloS One
https://www.readbyqxmd.com/read/28992016/determining-the-effects-of-early-gestation-in-utero-heat-stress-on-postnatal-fasting-heat-production-and-circulating-biomarkers-associated-with-metabolism-in-growing-pigs
#17
N M Chapel, C J Byrd, D W Lugar, G M Morello, L H Baumgard, J W Ross, T J Safranski, M C Lucy, J S Johnson
The study objective was to characterize effects of early gestation in utero heat stress (IUHS) on postnatal fasting heat production (FHP) and blood biomarkers associated with metabolism in growing pigs. Based on previous observation of increased postnatal core body temperature set point in IUHS pigs, we hypothesized that FHP would be altered during postnatal life because of IUHS. Pregnant first-parity gilts were exposed to thermoneutral (TN; = 4; 17.8 ± 0.1°C) or heat stress (HS; = 4; cyclical 28 to 38°C) conditions from d 30 to 60 of gestation...
September 2017: Journal of Animal Science
https://www.readbyqxmd.com/read/28991042/maximum-skin-wettedness-following-aerobic-training-with-and-without-heat-acclimation
#18
Nicholas Ravanelli, Geoff Coombs, Pascal Imbeault, Ollie Jay
PURPOSE: To quantify how maximum skin wettedness (ωmax), i.e. the determinant of the boundary between compensable and uncompensable heat stress, is i) altered by aerobic training in previously unfit individuals, and ii) further augmented by heat acclimation. METHODS: Eight untrained individuals completed an 8-week aerobic training program immediately followed by 8 days of hot/humid (38°C, 65%RH) heat acclimation. Participants completed a humidity ramp protocol pre-training (PRE-TRN), post-training (POST-TRN), and post-heat acclimation (POST-HA), involving treadmill marching at a heat production of 450 W for 105 mins in 37...
October 3, 2017: Medicine and Science in Sports and Exercise
https://www.readbyqxmd.com/read/28982965/critical-thermal-limits-affected-differently-by-developmental-and-adult-thermal-fluctuations
#19
Paul Vinu Salachan, Jesper Givskov Sørensen
Means and variances of the environmental thermal regime play an important role in determining the fitness of terrestrial ectotherms. Adaptive phenotypic responses induced by heterogeneous temperatures have been shown to be mediated by molecular pathways independent of the classic heat shock responses, however, an in-depth understanding of plasticity induced by fluctuating temperatures is still lacking. We investigated high and low temperature acclimation induced by fluctuating thermal regimes at two different mean temperatures, at two different amplitudes of fluctuation and across the developmental and adult life stages...
October 5, 2017: Journal of Experimental Biology
https://www.readbyqxmd.com/read/28956008/skin-mucus-proteins-of-lumpsucker-cyclopterus-lumpus
#20
Deepti Manjari Patel, Monica F Brinchmann
Fish skin mucus serves as a first line of defense against pathogens and external stressors. In this study the proteomic profile of lumpsucker skin mucus was characterized using 2D gels coupled with tandem mass spectrometry. Mucosal proteins were identified by homology searches across the databases SwissProt, NCBInr and vertebrate EST. The identified proteins were clustered into ten groups based on their gene ontology biological process in PANTHER (www.patherdb.org). Calmodulin, cystatin-B, histone H2B, peroxiredoxin1, apolipoprotein A1, natterin-2, 14-3-3 protein, alfa enolase, pentraxin, warm temperature acclimation 65 kDa (WAP65kDa) and heat shock proteins were identified...
March 2017: Biochemistry and Biophysics Reports
keyword
keyword
84569
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"