نتایج جستجو برای: thermal stress

تعداد نتایج: 644216  

Journal: :The Journal of experimental biology 2010
H-O Pörtner

The concept of oxygen- and capacity-dependent thermal tolerance in aquatic ectotherms has successfully explained climate-induced effects of rising temperatures on species abundance in the field. Oxygen supply to tissues and the resulting aerobic performance characters thus form a primary link between organismal fitness and its role and functioning at the ecosystem level. The thermal window of p...

2015
Ray Tobler Joachim Hermisson Christian Schlötterer

Thermal stress is a pervasive selective agent in natural populations that impacts organismal growth, survival, and reproduction. Drosophila melanogaster exhibits a variety of putatively adaptive phenotypic responses to thermal stress in natural and experimental settings; however, accompanying assessments of fitness are typically lacking. Here, we quantify changes in fitness and known thermal to...

The Universal Thermal Climate Index (UTCI) addresses these shortcomings by using an advanced thermo-physiological model. The aim of this study was to investigate and prepare zoning of thermal comfort condition using UTCI. Meteorological data including temperature, wind speed, cloudiness and relative humidity were obtained on a daily time scale from 10 synoptic stations during (2004-2013) period...

2009
Xi Wang Younes Ezzahri James Christofferson Ali Shakouri

The relationship of the biasing condition and the self-heating effect of a multi-channel metallic oxide semiconductor field effect transistor (MOSFET) device was examined using various channel currents ranging from triode to saturation regimes. When temperature non-uniformity is generated due to transistor self-heating, the local thermal resistance is conventionally defined through the differen...

2015
Zhe Li Kar Ho Chiu Raja Shahid Ashraf Sarah Fearn Rajeev Dattani Him Cheng Wong Ching-Hong Tan Jiaying Wu João T. Cabral James R. Durrant

UNLABELLED Morphological stability is a key requirement for outdoor operation of organic solar cells. We demonstrate that morphological stability and lifetime of polymer/fullerene based solar cells under thermal stress depend strongly on the substrate interface on which the active layer is deposited. In particular, we find that the stability of benchmark PCDTBT/PCBM solar cells under modest the...

M. Kalantar and G. Fantozzi,

Dense Silicon nitride was investigated to determine the effect of its microstructural parameters and densification on thermo-mechanical properties and thermal stress resistance to fracture initiation during a hot or cold mechanical and thermal shock testing. The different materials and microstructures were obtained by changing the parameters such as the type of the powder, additive, forming p...

2015
Xiaoduan Tang William Ross Morrow Chenxu Yu Wei Hong

Micro/nanoparticle induced nearfield laser ultrafocusing and heating has been widely used in laser-assisted nanopatterning and nanolithography to pattern nanoscale features on a large-area substrate. Probing of the temperature, stress, and optical fields induced by the nanoscale nearfield laser heating remains a great challenge since the heating area is very small (~100 nm or less) and not imme...

Journal: :Molecular ecology 2013
Shawn R Narum Nathan R Campbell Kevin A Meyer Michael R Miller Ronald W Hardy

To elucidate the mechanisms of thermal adaptation and acclimation in ectothermic aquatic organisms from differing climates, we used a common-garden experiment for thermal stress to investigate the heat shock response of redband trout (Oncorhynchus mykiss gairdneri) from desert and montane populations. Evidence for adaptation was observed as expression of heat shock genes in fish from the desert...

ژورنال: سلامت کار ایران 2016

Background and aims: When speaking of stress, it is considered to be the most negative aspects. Stress can develop some of physical, psychological and social illness. Too much stress can reduce performance and increase in accidents in the workplace. In the Cement production lines, there are many deleterious effects that play in outbreak of stress and endanger the health of workers. Methods: ...

2005
Michael S. Marber David S. Latchman Derek M. Yellon

Background. To test the hypothesis that the heat shock response is associated with myocardial salvage, the heat stress protein (HSP) content of cardiac tissue was increased by either ischemic or thermal stress. Methods and Results. Rabbits were divided into four groups. Ischemic pretreatment (n= 15) comprised four 5-minute episodes of coronary ligation separated by 10 minutes of reperfusion. Th...

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