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Journal of Thermal Biology

Farah Mneimneh, Nesreen Ghaddar, Kamel Ghali, Ibrahim Omeis, Charbel Moussalem
The objective of this work is to develop a Bioheat model to predict the thermal responses of people with tetraplegia (TP) under hot, cold and neutral ambient conditions as well as different physical activities suitable for their level of injury. The focus is on TP with impairment or loss of motor and/or sensory function in C1 to C7 segments of the spinal cord due to damage of neural elements within the spinal canal. Starting from transient multi-segmented Bioheat model of able-bodied (AB) people, specific modifications were performed reflecting the changes in physiology due to the injury affecting the blood circulation system, energy expenditure, and thermoregulatory functions in the body...
October 2018: Journal of Thermal Biology
Sueli Ferreira da Fonseca, Vanessa Amaral Mendonça, Sara Barros Silva, Talita Emanuela Domingues, Dirceu Sousa Melo, Jeanne Brenda Martins, Washington Pires, Cynthia Ferreira Fernandes Santos, Wagner de Fátima Pereira, Laura Hora Rios Leite, Cândido Celso Coimbra, Hércules Ribeiro Leite, Ana Cristina Rodrigues Lacerda
There is evidence that central cholinergic stimulation increases heat dissipation in normotensive rats besides causing changes on the cardiovascular system via modulation of baroreceptors activity. However, the contribution of the central cholinergic system on thermoregulatory responses and its relationship with cardiovascular adjustments in spontaneously hypertensive rats (SHRs), an animal model of reduced baroreceptor sensitivity and thermoregulatory deficit, has not been completely clarified. Therefore, the aim of this study was to verify the involvement of the central cholinergic system in cardiovascular and thermoregulatory adjustments in SHRs...
October 2018: Journal of Thermal Biology
Gyanendra Singh Sengar, Rajiv Kant, Rajib Deb, Preetam Verma
Heat shock protein 70 (Hsp70) is a widely known mammalian stress-inducible protein critical for cytoprotection against different stressors. Despite the chaperone based cytoprotective functions, intracellular Hsp70 also participates in diverse immune modulatory activities. To investigate the immune modulatory effect of inducible bovine Hsp70, we examined the expression profile of four major pattern recognition receptors (PRRs) viz. TLR2/4 and NOD1/2 using two different invitro cell cultured models. We observed that, invitro acute heat stress and Geranylgeranylacetone (GGA) induction increased the level of Hsp70 which upregulated the expression of all the four PRRs in both the cell cultured models...
October 2018: Journal of Thermal Biology
Carlos Garcia-Robledo, Mariela Charlotten-Silva, Christopher Cruz, Erin K Kuprewicz
Determining responses of organisms to changing temperatures is a research priority, as global warming threatens populations and ecosystems worldwide. Upper thermal limits are frequently measured as the critical thermal maximum (CTmax ), a quick bioassay where organisms are exposed to increasing temperatures until individuals are not able to perform basic motor activities such as walking or flying. A more informative approach to understand organism responses to global warming is to evaluate how vital rates, such as growth or survival, change with temperatures...
October 2018: Journal of Thermal Biology
Julia Heinicke, Gundula Hoffmann, Christian Ammon, Barbara Amon, Thomas Amon
In recent years, the problem of the welfare and heat load of dairy cows has become increasingly important in moderate climate zones. The objective of the present study was to determine heat load thresholds of average daily temperature-humidity index (THI) that lead to changes in different activity traits of lactating high-yielding dairy cows. Furthermore, we studied how the activity of the cows to heat load was influenced by the daily heat load duration which exceeded the heat load we had determined as threshold in our experiments...
October 2018: Journal of Thermal Biology
Patrick B Wilson
Research has shown that carbohydrate consumption can increase body temperature at rest and, in some cases, during exercise. Most exercise studies, however, haven't matched exercise intensity between carbohydrate and placebo conditions. The purpose of this randomized, double-blind, placebo-controlled trial was to examine whether pre-exercise carbohydrate consumption independently accelerates the usual temperature rise with intense exercise. Twenty-eight runners self-reported 5-km performance (16-23 min) and were randomized, using a matched-pairs design, to 750 ml water containing 100 g sucrose or 0...
October 2018: Journal of Thermal Biology
I Khmelinskii, V I Makarov
Presently we communicate a newly developed method of resonant radiofrequency heating, applicable in hyperthermal therapy. This method uses electron paramagnetic resonance (EPR) to transform the electromagnetic field energy into heat. We report the growth dynamics of the S. cerevisiae yeast cells exposed to EPR heating with superparamagnetic magnetite (Fe3 O4 ) nanoparticles, with only 4% of yeast cells surviving hyperthermia. Given that EPR functions independently of type of the biologic species exposed, and produces spatially localized heating in conjunction with MRI hardware, it may be used in hyperthermal therapy of cancer and other diseases...
October 2018: Journal of Thermal Biology
Malikeh Nabaei, Mehrdad Karimi
Cryosurgery is an efficient cancer treatment which can be used for non-invasive ablation of some internal tumors such as liver and prostate. Tumors are usually located near the large blood vessels and the heat convection may affect the progression of the ice ball. Hence it is necessary to predict the surgery procedure and its consequences earlier. In spite of the recent studies it is still unclear that which arteries will significantly affect the freezing treatment of tumors and which can be ignored. Therefore a numerical model of a spherical 3 cm diameter liver tumor, subjected to cryosurgery was developed...
October 2018: Journal of Thermal Biology
Audrey Trochet, Andréaz Dupoué, Jérémie Souchet, Romain Bertrand, Marine Deluen, Sophie Murarasu, Olivier Calvez, Albert Martinez-Silvestre, Isabel Verdaguer-Foz, Elodie Darnet, Hugo Le Chevalier, Marc Mossoll-Torres, Olivier Guillaume, Fabien Aubret
Temperature affects the physiological functions of ectotherms. To maintain optimal body temperature and ensure physiological performance, these organisms can use behavioral adjustments to keep the body temperature in their specific temperature range, so-called preferred temperature (Tpref ). It is therefore crucial to describe and understand how Tpref vary within and amongst populations to predict the effects of climate change of altitudinal range shifts in organisms. We aimed at determining the altitudinal variations in Tpref in three ectothermic species (the Pyrenean brook salamander - a semi-aquatic and thigmothermic amphibian - the European common lizard and the wall lizard - both heliothermic species)...
October 2018: Journal of Thermal Biology
Xiaoshuai Wang, Bjarne Schmidt Bjerg, Christopher Y Choi, Chao Zong, Guoqiang Zhang
Many thermal indices have been developed to assess the levels of heat stress imposed on cattle during hot weather. In this paper, the 16 cattle-related thermal indices are critically reviewed. The primary emphasis is to evaluate each index's coherence to the typical heat transfer characteristics of a cow. Other perspectives including incorporated environmental parameters in the equation(s), experimental data, correlated physiological responses, heat-stress thresholds, scope of application, specific cattle breed involved, and experiment location(s) are also well categorised and discussed...
October 2018: Journal of Thermal Biology
Wei-Lin Tu, Chuen-Yu Cheng, Chao-Jung Chen, Hong-Lin Chan, Shih-Han Wang, Pin-Chi Tang, Chih-Feng Chen, Yen-Pai Lee, Shuen-Ei Chen, San-Yuan Huang
The hypothalamus is the coordinating center for maintaining temperature homeostasis. In this study, global protein expression in the hypothalami of layer-type Taiwan country chickens in response to acute heat stress was investigated. Twelve 30-week-old female TCCs were divided into three acute heat-stressed groups, namely acute heat stress at 36 °C for 4 h with 0 h (without recovery, H4R0), 2 h (H4R2), or 6 h (H4R6) of recovery. A control group was maintained at 25 °C. Hypothalamus samples were collected at the end of each time point for proteomic analysis...
October 2018: Journal of Thermal Biology
Alexandra Malgoyre, Pierre-Emmanuel Tardo-Dino, Nathalie Koulmann, Benoît Lepetit, Loïc Jousseaume, Keyne Charlot
Heat acclimatization may help personnel who travel to areas with a hot climate (WBGT > 27 °C), making them operationally more efficient and performant through improvements in physiological and psychological parameters. Their work-related physical activities may aid active heat acclimatization. However, it is unknown whether adding physical training to improve adaptation is effective, particularly if there is sufficient time for full acclimatization, classically reached after 15 days. Thirty French soldiers (Training group, T) performed a progressive and moderate (from three to five 8-min running sets at 50-60% of their speed at VO2max with 4-min periods of active recovery in between) aerobic training program upon arriving at their base in United Arab Emirates (~40 °C and 20% RH)...
October 2018: Journal of Thermal Biology
Guilherme M J Costa, Samyra M S N Lacerda, André F A Figueiredo, Marcelo C Leal, José V Rezende-Neto, Luiz R França
Temperature is considered a crucial modulator of reproductive activity and testis homeostasis. It is well known that elevated temperatures cause several effects on testicular components, particularly on germ cells, which might lead to the impairment of spermatogenesis and loss of male fertility. The present study aimed to evaluate the effects of different environmental temperatures on several morphofunctional testis parameters, with emphasis on duration of spermatogenesis and spermatogenic efficiency. Thirty sexually mature Swiss mice (Mus musculus) were allocated in three different experimental groups, being kept in vivarium for three weeks at 16 °C, 23 °C (control group) and 32 °C...
October 2018: Journal of Thermal Biology
Kasiphak Kaikaew, Johanna C van den Beukel, Sebastian J C M M Neggers, Axel P N Themmen, Jenny A Visser, Aldo Grefhorst
To maintain a thermal balance when experiencing cold, humans reduce heat loss and enhance heat production. A potent and rapid mechanism for heat generation is shivering. Research has shown that women prefer a warmer environment and feel less comfortable than men in the same thermal condition. Using the Blanketrol® III, a temperature management device commonly used to study brown adipose tissue activity, we tested whether the experimental temperature (TE ) at which men and women start to shiver differs. Twenty male and 23 female volunteers underwent a cooling protocol, starting at 24 °C and gradually decreasing by 1-2 °C every 5 min until an electromyogram detected the shivering or the temperature reached 9 °C...
October 2018: Journal of Thermal Biology
Jesús E Fajardo, C Manuel Carlevaro, Fernando Vericat, Enrique Berjano, Ramiro M Irastorza
The objective of this work is to quantify the relation between the value of the effective thermal conductivity of trabecular bone and its microstructure and marrow content. The thermal conductivity of twenty bovine trabecular bone samples was measured prior to and after defatting at 37, 47, and 57 °C. Computer models were built including the microstructure geometry and the gap between the tissue and measurement probe. The thermal conductivity (k) measured was 0.39 ± 0.06 W m-1 K-1 at 37 °C, with a temperature dependence of + 0...
October 2018: Journal of Thermal Biology
Hairui Xin, Xiaojun Zhang, Dengsheng Sun, Chuang Zhang, Yue Hao, Xianhong Gu
The insulin-like activity of insulin-like growth factor-1 (IGF-1) is heavily blunted by IGF binding proteins (IGFBPs, including IGFBP-1 and IGFBP-3). The effects of heat stress (HS) on the IGF-1 and IGFBPs in growing pigs are still not clear. This study aimed to investigate the alterations of IGF-1 and IGFBPs under chronic HS in growing pigs. Twenty-seven growing large white barrows with similar body weight were collected from nine litters and were assigned into three treatments. The litter effect is balanced in all treatments...
October 2018: Journal of Thermal Biology
Neeraj Kumar, K K Krishnani, Paritosh Kumar, Rupam Sharma, Raju Baitha, Dilip Kumar Singh, Narendra Pratap Singh
Unexpected fluctuations in weather parameters due to global climate change have been observed in all ecosystems worldwide. The aquatic ecosystem shelters a great diversity of fishes in the upper region of the ecosystem which adversely get affected due to their poikilothermic nature. The present study was designed to elucidate the impact of critical temperature minima (CTMin), lethal temperature minima (LTMin), critical temperature maxima (CTMax), and lethal temperature maxima (LTMax) on Channa striatus. Biologically synthesized silver nanoparticles (Ag-NPs) were evaluated for their potential to enhance thermal tolerance and improve the activities of biochemical enzymes of C...
October 2018: Journal of Thermal Biology
Martin Holmstrup
Springtails (Collembola) are ubiquitous and help ecosystem processes such as the decomposition of dead plant material. Their ability to survive low winter temperatures is an important trait that partly defines their geographic distribution. The cold tolerances of 15 laboratory-reared species of springtails were investigated. Springtails were cold acclimated in the laboratory over two months in order to simulate a seasonal change in temperature during autumn. Springtails were then exposed to decreasing sub-zero temperatures and at the same time simulating the moisture conditions in frozen soil...
October 2018: Journal of Thermal Biology
Lucia E Biddle, Adrian M Goodman, D Charles Deeming
Thermal properties of nests have been investigated using a variety of techniques. Infrared (IR) thermography has the advantage of being a non-invasive technique allowing the integrity of the nest wall to be retained during measurement. This study investigated the insulative properties of nests of the Eurasian Bullfinch (Pyrrhula pyrrhula), the Common Blackbird (Turdus merula) and the Song Thrush (Turdus philomelos) using IR thermography. Nests were inverted over a heat source and the temperature of the external nest surface was recorded...
August 2018: Journal of Thermal Biology
Ming Ma, Yu Zhang, Ning Gu
The treatment of cancer by hyperthermia requires prediction, monitoring and control of the temperature within the tumor. Infrared thermography (IRT) was presented in this paper as a noninvasive temperature monitoring method used in magnetic nanoparticle hyperthermia (MNH). We tried to use this surface temperature measurement method to get information about the intratumoral temperature. Experimental in vitro MNH studies were performed on gel tumor-tissue phantoms which were constructed to simulate the real tumor and overlying healthy tissue...
August 2018: Journal of Thermal Biology
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