Base de dados : MEDLINE
Pesquisa : G07.110.232 [Categoria DeCS]
Referências encontradas : 21347 [refinar]
Mostrando: 1 .. 10   no formato [Detalhado]

página 1 de 2135 ir para página                         

  1 / 21347 MEDLINE  
              next record last record
seleciona
para imprimir
Fotocópia
Texto completo
[PMID]:29335818
[Au] Autor:Ohrnberger SA; Brinkmann K; Palme R; Valencak TG
[Ad] Endereço:Institute of Physiology, Pathophysiology and Biophysics, Department of Biomedical Sciences, University of Veterinary Medicine Vienna, Veterinärplatz 1, 1210, Vienna, Austria. sarah.ohrnberger@vetmeduni.ac.at.
[Ti] Título:Dorsal shaving affects concentrations of faecal cortisol metabolites in lactating golden hamsters.
[So] Source:Naturwissenschaften;105(1-2):13, 2018 Jan 15.
[Is] ISSN:1432-1904
[Cp] País de publicação:Germany
[La] Idioma:eng
[Ab] Resumo:Breeding of golden hamsters is classically performed at thermal conditions ranging from 20 to 24 °C. However, growing evidence suggests that lactating females suffer from heat stress. We hypothesised that shaving females dorsally to maximise heat dissipation may reduce stress during reproduction. We thus compared faecal cortisol metabolites (FCM) from shaved golden hamster mothers with those from unshaved controls. We observed significantly lower FCM levels in the shaved mothers (F = 8.69, p = 0.0075) pointing to lower stress due to ameliorated heat dissipation over the body surface. In addition, we observed 0.4 °C lower mean subcutaneous body temperatures in the shaved females, although this effect did not reach significance (F = 1.86, p = 0.18). Our results suggest that golden hamsters having body masses being more than four times that of laboratory mice provide a very interesting model to study aspects of lactation and heat production at the same time.
[Mh] Termos MeSH primário: Regulação da Temperatura Corporal
Cricetinae/fisiologia
[Mh] Termos MeSH secundário: Animais
Animais Domésticos
Temperatura Corporal/fisiologia
Fezes/química
Feminino
Remoção de Cabelo/veterinária
Hidrocortisona/metabolismo
Lactação
Reprodução/fisiologia
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
WI4X0X7BPJ (Hydrocortisone)
[Em] Mês de entrada:1803
[Cu] Atualização por classe:180302
[Lr] Data última revisão:
180302
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:180117
[St] Status:MEDLINE
[do] DOI:10.1007/s00114-017-1536-7


  2 / 21347 MEDLINE  
              first record previous record next record last record
seleciona
para imprimir
Fotocópia
Texto completo
[PMID]:29294204
[Au] Autor:Yang C; Huang Q; Wang L; Du WG; Liang W; Møller AP
[Ad] Endereço:Ministry of Education Key Laboratory for Ecology of Tropical Islands, College of Life Sciences, Hainan Normal University, Haikou 571158, China.
[Ti] Título:Keeping eggs warm: thermal and developmental advantages for parasitic cuckoos of laying unusually thick-shelled eggs.
[So] Source:Naturwissenschaften;105(1-2):10, 2018 Jan 02.
[Is] ISSN:1432-1904
[Cp] País de publicação:Germany
[La] Idioma:eng
[Ab] Resumo:Obligate brood parasites have evolved unusually thick-shelled eggs, which are hypothesized to possess a variety of functions such as resistance to puncture ejection by their hosts. In this study, we tested the hypothesis that obligate brood parasites lay unusually thick-shelled eggs to retain more heat for the developing embryo and thus contribute to early hatching of parasite eggs. By doing so, we used an infrared thermal imaging system as a non-invasive method to quantify the temperature of eggshells of common cuckoos (Cuculus canorus) and their Oriental reed warbler (Acrocephalus orientalis) hosts in an experiment that artificially altered the duration of incubation. Our results showed that cuckoo eggshells had higher temperature than host eggs during incubation, but also less fluctuations in temperature during incubation disturbance. Therefore, there was a thermal and hence a developmental advantage for brood parasitic cuckoos of laying thick-shelled eggs, providing another possible explanation for the unusually thick-shelled eggs of obligate brood parasites and earlier hatching of cuckoo eggs compared to those of the host.
[Mh] Termos MeSH primário: Evolução Biológica
Aves/anatomia & histologia
Regulação da Temperatura Corporal
Casca de Ovo/anatomia & histologia
[Mh] Termos MeSH secundário: Animais
Aves/embriologia
Aves/fisiologia
Interações Hospedeiro-Parasita
Reprodução
Aves Canoras/parasitologia
Temperatura Ambiente
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Em] Mês de entrada:1803
[Cu] Atualização por classe:180302
[Lr] Data última revisão:
180302
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:180103
[St] Status:MEDLINE
[do] DOI:10.1007/s00114-017-1532-y


  3 / 21347 MEDLINE  
              first record previous record next record last record
seleciona
para imprimir
Fotocópia
Texto completo
[PMID]:28457645
[Au] Autor:Maggini I; Kennedy LV; Bursian SJ; Dean KM; Gerson AR; Harr KE; Link JE; Pritsos CA; Pritsos KL; Guglielmo CG
[Ad] Endereço:Advanced Facility for Avian Research, University of Western Ontario, London, ON, Canada N6G 1G9; Konrad-Lorenz Institute of Ethology, University of Veterinary Medicine, Savoyenstrasse 1a, 1160 Vienna, Austria. Electronic address: ivan.maggini@vetmeduni.ac.at.
[Ti] Título:Toxicological and thermoregulatory effects of feather contamination with artificially weathered MC 252 oil in western sandpipers (Calidris mauri).
[So] Source:Ecotoxicol Environ Saf;146:118-128, 2017 Dec.
[Is] ISSN:1090-2414
[Cp] País de publicação:Netherlands
[La] Idioma:eng
[Ab] Resumo:The external contamination of bird feathers with crude oil might have effects on feather structure and thus on thermoregulation. We tested the thermoregulatory ability of western sandpipers (Calidris mauri) in a respirometry chamber with oil applied either immediately prior, or three days before the experiment. The birds were then exposed to a sliding cold temperature challenge between 27°C and -3°C to calculate thermal conductance. After the experiment, a large blood sample was taken and the liver extracted to measure a range of parameters linked to toxicology and oxidative stress. No differences in thermal conductance were observed among groups, but birds exposed to oil for three days had reduced body temperatures and lost more body mass during that period. At necropsy, oiled birds showed a decrease in plasma albumin and sodium, and an increase in urea. This is reflective of dysfunction in the kidney at the loop of Henle. Birds, especially when exposed to the oil for three days, showed signs of oxidative stress and oxidative damage. These results show that the ingestion of externally applied oil through preening or drinking can cause toxic effects even in low doses, while we did not detect a direct effect of the external oil on thermoregulation over the temperature range tested.
[Mh] Termos MeSH primário: Regulação da Temperatura Corporal/efeitos dos fármacos
Charadriiformes/fisiologia
Plumas/química
Estresse Oxidativo/efeitos dos fármacos
Petróleo/toxicidade
Poluentes Químicos da Água/toxicidade
[Mh] Termos MeSH secundário: Administração Cutânea
Animais
Peso Corporal/efeitos dos fármacos
Charadriiformes/sangue
Metabolismo Energético/efeitos dos fármacos
Fígado/efeitos dos fármacos
Fígado/metabolismo
Poluição por Petróleo/efeitos adversos
Testes de Toxicidade
Tempo (Meteorologia)
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Petroleum); 0 (Water Pollutants, Chemical)
[Em] Mês de entrada:1803
[Cu] Atualização por classe:180302
[Lr] Data última revisão:
180302
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170502
[St] Status:MEDLINE


  4 / 21347 MEDLINE  
              first record previous record next record last record
seleciona
para imprimir
Fotocópia
Texto completo
[PMID]:28376678
[Au] Autor:Lee BJ; Clarke ND; Hankey J; Thake CD
[Ad] Endereço:a Department of Sport and Exercise Sciences , University of Chichester , Chichester , UK.
[Ti] Título:Whole body precooling attenuates the extracellular HSP72, IL-6 and IL-10 responses after an acute bout of running in the heat.
[So] Source:J Sports Sci;36(4):414-421, 2018 Feb.
[Is] ISSN:1466-447X
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:The impact of whole-body precooling on the extracellular heat shock protein 72 (eHSP72) and cytokine responses to running in the heat is undefined. The aim of this study was to determine whether precooling would attenuate post-exercise eHSP72 and cytokine responses. Eight male recreational runners completed two 90-minute bouts of running at 65% [Formula: see text]O max in 32 ± 0.9°C and 47 ± 6 % relative humidity (RH) preceded by either 60-minutes of precooling in 20.3 ± 0.3°C water (COOL) or 60 min rest in an air-conditioned laboratory (20.2 ± 1.7°C, 60 ± 3% RH; CON). eHSP72, TNF-α, IL-6, IL-10 IL-1ra were determined before and immediately after exercise. The elevation in post-exercise eHSP72 was attenuated after COOL (+0.04 ± 0.10 ng.mL ) compared to CON (+ 0.29 ± 0.26 ng.mL ;P < 0.001). No changes in TNF-α were observed at any stage. COOL reduced the absolute post-exercise change in IL-6 (P = 0.011) and IL-10 (P = 0.03) compared to CON. IL-1ra followed this trend (P = 0.063). A precooling-induced attenuation of eHSP72 and proinflammatory cytokines may aid recovery during multi-day sporting events, but could be counterproductive if a training response or adaptation to environmental stress is a desired outcome.
[Mh] Termos MeSH primário: Crioterapia/métodos
Proteínas de Choque Térmico HSP72/sangue
Temperatura Alta/efeitos adversos
Interleucina-10/sangue
Interleucina-6/sangue
Corrida/fisiologia
[Mh] Termos MeSH secundário: Adulto
Regulação da Temperatura Corporal
Seres Humanos
Interleucina-1/sangue
Masculino
Fator de Necrose Tumoral alfa/sangue
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (HSP72 Heat-Shock Proteins); 0 (Interleukin-1); 0 (Interleukin-6); 0 (Tumor Necrosis Factor-alpha); 130068-27-8 (Interleukin-10)
[Em] Mês de entrada:1803
[Cu] Atualização por classe:180302
[Lr] Data última revisão:
180302
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170406
[St] Status:MEDLINE
[do] DOI:10.1080/02640414.2017.1313441


  5 / 21347 MEDLINE  
              first record previous record next record last record
seleciona
para imprimir
Fotocópia
Texto completo
[PMID]:27167826
[Au] Autor:Okamoto-Mizuno K; Mizuno K; Shirakawa S
[Ad] Endereço:a Kansei Fukushi Research Center , Tohoku Fukushi University , Miyagi , Japan.
[Ti] Título:Sleep and Skin Temperature in Preschool Children and Their Mothers.
[So] Source:Behav Sleep Med;16(1):64-78, 2018 Jan-Feb.
[Is] ISSN:1540-2010
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:The purpose of this study was to investigate and compare sleep and skin temperature (Tsk) of preschool children with those of their mothers. The subjects included 18 pairs of preschool children and their mothers. The actigraphic measurement of sleep, Tsk, heart rate, bedroom climate, and the microclimate temperature and humidity (bed climate) were measured. Proximal and distal Tsk, the temperature gradient of distal and proximal Tsk (DPG), and bed climate temperature were significantly lower in the children. Approximately 70% of the children slept without bed covering. Heat dissipation during sleep in preschool children may primarily rely on the proximal Tsk. The lower Tsk than adults, and behavioral thermoregulation, may be important for sleep in preschoolers.
[Mh] Termos MeSH primário: Mães
Temperatura Cutânea
Sono/fisiologia
[Mh] Termos MeSH secundário: Actigrafia
Adulto
Regulação da Temperatura Corporal/fisiologia
Pré-Escolar
Feminino
Frequência Cardíaca
Seres Humanos
Umidade
Masculino
Temperatura Ambiente
[Pt] Tipo de publicação:COMPARATIVE STUDY; JOURNAL ARTICLE; RESEARCH SUPPORT, NON-U.S. GOV'T
[Em] Mês de entrada:1712
[Cu] Atualização por classe:180216
[Lr] Data última revisão:
180216
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:160512
[St] Status:MEDLINE
[do] DOI:10.1080/15402002.2016.1173552


  6 / 21347 MEDLINE  
              first record previous record next record last record
seleciona
para imprimir
Fotocópia
Texto completo
[PMID]:29240763
[Au] Autor:Radeva T; Dornhaus A; Lynch N; Nagpal R; Su HH
[Ad] Endereço:Electrical Engineering and Computer Science Department, Massachusetts Institute of Technology, Cambridge, MA, USA.
[Ti] Título:Costs of task allocation with local feedback: Effects of colony size and extra workers in social insects and other multi-agent systems.
[So] Source:PLoS Comput Biol;13(12):e1005904, 2017 12.
[Is] ISSN:1553-7358
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:Adaptive collective systems are common in biology and beyond. Typically, such systems require a task allocation algorithm: a mechanism or rule-set by which individuals select particular roles. Here we study the performance of such task allocation mechanisms measured in terms of the time for individuals to allocate to tasks. We ask: (1) Is task allocation fundamentally difficult, and thus costly? (2) Does the performance of task allocation mechanisms depend on the number of individuals? And (3) what other parameters may affect their efficiency? We use techniques from distributed computing theory to develop a model of a social insect colony, where workers have to be allocated to a set of tasks; however, our model is generalizable to other systems. We show, first, that the ability of workers to quickly assess demand for work in tasks they are not currently engaged in crucially affects whether task allocation is quickly achieved or not. This indicates that in social insect tasks such as thermoregulation, where temperature may provide a global and near instantaneous stimulus to measure the need for cooling, for example, it should be easy to match the number of workers to the need for work. In other tasks, such as nest repair, it may be impossible for workers not directly at the work site to know that this task needs more workers. We argue that this affects whether task allocation mechanisms are under strong selection. Second, we show that colony size does not affect task allocation performance under our assumptions. This implies that when effects of colony size are found, they are not inherent in the process of task allocation itself, but due to processes not modeled here, such as higher variation in task demand for smaller colonies, benefits of specialized workers, or constant overhead costs. Third, we show that the ratio of the number of available workers to the workload crucially affects performance. Thus, workers in excess of those needed to complete all tasks improve task allocation performance. This provides a potential explanation for the phenomenon that social insect colonies commonly contain inactive workers: these may be a 'surplus' set of workers that improves colony function by speeding up optimal allocation of workers to tasks. Overall our study shows how limitations at the individual level can affect group level outcomes, and suggests new hypotheses that can be explored empirically.
[Mh] Termos MeSH primário: Insetos/fisiologia
Modelos Biológicos
Comportamento Social
[Mh] Termos MeSH secundário: Algoritmos
Animais
Comportamento Animal/fisiologia
Regulação da Temperatura Corporal
Biologia Computacional
Simulação por Computador
Retroalimentação Fisiológica
Biologia de Sistemas
Análise e Desempenho de Tarefas
[Pt] Tipo de publicação:JOURNAL ARTICLE; RESEARCH SUPPORT, NON-U.S. GOV'T
[Em] Mês de entrada:1801
[Cu] Atualização por classe:180123
[Lr] Data última revisão:
180123
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:171215
[St] Status:MEDLINE
[do] DOI:10.1371/journal.pcbi.1005904


  7 / 21347 MEDLINE  
              first record previous record next record last record
seleciona
para imprimir
Fotocópia
Texto completo
[PMID]:29212523
[Au] Autor:Maeda T
[Ad] Endereço:Department of Human Science, Faculty of Design, Kyushu University, 4-9-1, Shiobaru, Minami-ku, Fukuoka, 815-8540, Japan. maeda@design.kyushu-u.ac.jp.
[Ti] Título:Relationship between maximum oxygen uptake and peripheral vasoconstriction in a cold environment.
[So] Source:J Physiol Anthropol;36(1):42, 2017 Dec 06.
[Is] ISSN:1880-6805
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:BACKGROUND: Various individual characteristics affect environmental adaptability of a human. The present study evaluates the relationship between physical fitness and peripheral vasoconstriction in a cold environment. METHODS: Seven healthy male students (aged 22.0 years) participated in this study. Cold exposure tests consisted of supine rest for 60 min at 28 °C followed by 90 min at 10 °C. Rectal and skin temperatures at seven sites, oxygen consumption, and the diameter of a finger vein were measured during the experiment. Metabolic heat production, skin heat conductance, and the rate of vasoconstriction were calculated. Individual maximum oxygen consumption, a direct index of aerobic fitness, was measured on the day following the cold exposure test. RESULTS: Decreases in temperature of the hand negatively correlated with the changes in rectal temperature. Maximum oxygen consumption and the rate of vasoconstriction are positively correlated. Furthermore, pairs of the following three factors are also significantly correlated: rate of metabolic heat production, skin heat conductance, and the rate of vasoconstriction. CONCLUSION: The results of this study suggested that the capacity for peripheral vasoconstriction can be improved by physical exercise. Furthermore, when exposed to a cold environment, fitter individuals could maintain metabolic heat production at the resting metabolic level of a thermoneutral condition, as they correspondingly lost less heat.
[Mh] Termos MeSH primário: Regulação da Temperatura Corporal/fisiologia
Consumo de Oxigênio/fisiologia
Termogênese/fisiologia
Vasoconstrição/fisiologia
[Mh] Termos MeSH secundário: Adulto
Temperatura Baixa
Dedos/irrigação sanguínea
Dedos/fisiologia
Seres Humanos
Masculino
Espectroscopia de Luz Próxima ao Infravermelho
Adulto Jovem
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Em] Mês de entrada:1712
[Cu] Atualização por classe:171227
[Lr] Data última revisão:
171227
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:171208
[St] Status:MEDLINE
[do] DOI:10.1186/s40101-017-0158-2


  8 / 21347 MEDLINE  
              first record previous record next record last record
seleciona
para imprimir
Fotocópia
Texto completo
[PMID]:29176781
[Au] Autor:Dou S; Villa-Vialaneix N; Liaubet L; Billon Y; Giorgi M; Gilbert H; Gourdine JL; Riquet J; Renaudeau D
[Ad] Endereço:PEGASE, INRA, Agrocampus Ouest, St Gilles, France.
[Ti] Título:1HNMR-Based metabolomic profiling method to develop plasma biomarkers for sensitivity to chronic heat stress in growing pigs.
[So] Source:PLoS One;12(11):e0188469, 2017.
[Is] ISSN:1932-6203
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:The negative impact of heat stress (HS) on the production performances in pig faming is of particular concern. Novel diagnostic methods are needed to predict the robustness of pigs to HS. Our study aimed to assess the reliability of blood metabolome to predict the sensitivity to chronic HS of 10 F1 (Large White × Creole) sire families (SF) reared in temperate (TEMP) and in tropical (TROP) regions (n = 56±5 offsprings/region/SF). Live body weight (BW) and rectal temperature (RT) were recorded at 23 weeks of age. Average daily feed intake (AFDI) and average daily gain were calculated from weeks 11 to 23 of age, together with feed conversion ratio. Plasma blood metabolome profiles were obtained by Nuclear Magnetic Resonance spectroscopy (1HNMR) from blood samples collected at week 23 in TEMP. The sensitivity to hot climatic conditions of each SF was estimated by computing a composite index of sensitivity (Isens) derived from a linear combination of t statistics applied to familial BW, ADFI and RT in TEMP and TROP climates. A model of prediction of sensitivity was established with sparse Partial Least Square Discriminant Analysis (sPLS-DA) between the two most robust SF (n = 102) and the two most sensitive ones (n = 121) using individual metabolomic profiles measured in TEMP. The sPLS-DA selected 29 buckets that enabled 78% of prediction accuracy by cross-validation. On the basis of this training, we predicted the proportion of sensitive pigs within the 6 remaining families (n = 337). This proportion was defined as the predicted membership of families to the sensitive category. The positive correlation between this proportion and Isens (r = 0.97, P < 0.01) suggests that plasma metabolome can be used to predict the sensitivity of pigs to hot climate.
[Mh] Termos MeSH primário: Biomarcadores/sangue
Transtornos de Estresse por Calor/metabolismo
Metabolômica
Suínos/crescimento & desenvolvimento
[Mh] Termos MeSH secundário: Animais
Regulação da Temperatura Corporal
Clima
Espectroscopia de Prótons por Ressonância Magnética
[Pt] Tipo de publicação:JOURNAL ARTICLE; VALIDATION STUDIES
[Nm] Nome de substância:
0 (Biomarkers)
[Em] Mês de entrada:1712
[Cu] Atualização por classe:171226
[Lr] Data última revisão:
171226
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:171128
[St] Status:MEDLINE
[do] DOI:10.1371/journal.pone.0188469


  9 / 21347 MEDLINE  
              first record previous record next record last record
seleciona
para imprimir
Fotocópia
Texto completo
[PMID]:29155610
[Au] Autor:Richardson CS; Heeren T; Kunz TH
[Ti] Título:Seasonal and Sexual Variation in Metabolism, Thermoregulation, and Hormones in the Big Brown Bat (Eptesicus fuscus).
[So] Source:Physiol Biochem Zool;91(1):705-715, 2018 Jan/Feb.
[Is] ISSN:1537-5293
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:In response to seasonal variation in energy availability and thermal environment, physiological and endocrine mechanisms have evolved in temperate zone animals. Seasonal changes in hormone activity affect metabolism, body temperature, and reproductive activity. We examined the seasonal regulatory role of hormones on basal metabolic rate (BMR) and regulatory nonshivering thermogenesis (RNST) in 98 female and 17 male adult Eptesicus fuscus (big brown bat). We measured BMR, RNST, and plasma levels of thyroid hormone (T ), leptin, and cortisol in bats captured in maternity colonies in eastern Massachusetts from May to August (from arousal from the hibernation phase to the prehibernation phase). We hypothesized that all three hormones are seasonally primarily metabolic hormones and secondarily thermogenic hormones. In males, only BMR significantly changed seasonally. In females, all five variables significantly changed seasonally. The seasonal pattern of plasma leptin and cortisol levels correlated with the seasonal pattern of BMR, with an initial increase followed by a decrease, suggesting that leptin and cortisol are primarily metabolic hormones. The seasonal pattern of plasma T levels generally paralleled the basic seasonal pattern of RNST, with both increasing at the second half of the season, suggesting that T is primarily a thermogenic hormone. The observed decrease in plasma leptin levels may be necessary to allow for the observed seasonal decrease in BMR, with the similar cortisol pattern important for leptin regulation. While T is needed to maintain BMR, it may play a more critical role in the seasonal regulation of RNST than of BMR.
[Mh] Termos MeSH primário: Regulação da Temperatura Corporal/fisiologia
Quirópteros/fisiologia
Metabolismo Energético/fisiologia
Hidrocortisona/sangue
Leptina/sangue
[Mh] Termos MeSH secundário: Animais
Quirópteros/sangue
Feminino
Masculino
Estações do Ano
Fatores Sexuais
Tiroxina/sangue
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Leptin); Q51BO43MG4 (Thyroxine); WI4X0X7BPJ (Hydrocortisone)
[Em] Mês de entrada:1712
[Cu] Atualização por classe:171215
[Lr] Data última revisão:
171215
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:171121
[St] Status:MEDLINE
[do] DOI:10.1086/695424


  10 / 21347 MEDLINE  
              first record previous record
seleciona
para imprimir
Fotocópia
Texto completo
[PMID]:29023468
[Au] Autor:Ong RH; King AJC; Kaandorp JA; Mullins BJ; Caley MJ
[Ad] Endereço:Fluid Dynamics Research Group, Curtin Institute for Computation, Department of Mechanical Engineering, Curtin University, Perth, Australia.
[Ti] Título:The effect of allometric scaling in coral thermal microenvironments.
[So] Source:PLoS One;12(10):e0184214, 2017.
[Is] ISSN:1932-6203
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:A long-standing interest in marine science is in the degree to which environmental conditions of flow and irradiance, combined with optical, thermal and morphological characteristics of individual coral colonies, affects their sensitivity of thermal microenvironments and susceptibility to stress-induced bleaching within and/or among colonies. The physiological processes in Scleractinian corals tend to scale allometrically as a result of physical and geometric constraints on body size and shape. There is a direct relationship between scaling to thermal stress, thus, the relationship between allometric scaling and rates of heating and cooling in coral microenvironments is a subject of great interest. The primary aim of this study was to develop an approximation that predicts coral thermal microenvironments as a function of colony morphology (shape and size), light or irradiance, and flow velocity or regime. To do so, we provided intuitive interpretation of their energy budgets for both massive and branching colonies, and then quantified the heat-size exponent (b*) and allometric constant (m) using logarithmic linear regression. The data demonstrated a positive relationship between thermal rates and changes in irradiance, A/V ratio, and flow, with an interaction where turbulent regime had less influence on overall stress which may serve to ameliorate the effects of temperature rise compared to the laminar regime. These findings indicated that smaller corals have disproportionately higher stress, however they can reach thermal equilibrium quicker. Moreover, excellent agreements between the predicted and simulated microscale temperature values with no significant bias were observed for both the massive and branching colonies, indicating that the numerical approximation should be within the accuracy with which they could be measured. This study may assist in estimating the coral microscale temperature under known conditions of water flow and irradiance, in particular when examining the intra- and inter-colony variability found during periods of bleaching conditions.
[Mh] Termos MeSH primário: Antozoários/fisiologia
Regulação da Temperatura Corporal/fisiologia
Temperatura Alta
Modelos Teóricos
[Mh] Termos MeSH secundário: Animais
Ecossistema
Meio Ambiente
Hidrodinâmica
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Em] Mês de entrada:1710
[Cu] Atualização por classe:171027
[Lr] Data última revisão:
171027
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:171013
[St] Status:MEDLINE
[do] DOI:10.1371/journal.pone.0184214



página 1 de 2135 ir para página                         
   


Refinar a pesquisa
  Base de dados : MEDLINE Formulário avançado   

    Pesquisar no campo  
1  
2
3
 
           



Search engine: iAH v2.6 powered by WWWISIS

BIREME/OPAS/OMS - Centro Latino-Americano e do Caribe de Informação em Ciências da Saúde