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https://www.readbyqxmd.com/read/28102957/rf-safety-assessment-of-a-bilateral-four-channel-transmit-receive-7-tesla-breast-coil-sar-versus-tissue-temperature-limits
#1
Thomas M Fiedler, Mark E Ladd, Andreas K Bitz
PURPOSE: The purpose of this work was to perform an RF safety evaluation for a bilateral four-channel transmit/receive breast coil and to determine the maximum permissible input power for which RF exposure of the subject stays within recommended limits. The safety evaluation was done based on SAR as well as on temperature simulations. In comparison to SAR, temperature is more directly correlated with tissue damage, which allows a more precise safety assessment. The temperature simulations were performed by applying three different blood perfusion models as well as two different ambient temperatures...
January 2017: Medical Physics
https://www.readbyqxmd.com/read/28072840/locomotor-activity-and-body-temperature-patterns-over-a-temperature-gradient-in-the-highveld-mole-rat-cryptomys-hottentotus-pretoriae
#2
Meghan Haupt, Nigel C Bennett, Maria K Oosthuizen
African mole-rats are strictly subterranean mammals that live in extensive burrow systems. High humidity levels in the burrows prevent mole-rats from thermoregulating using evaporative cooling. However, the relatively stable environment of the burrows promotes moderate temperatures and small daily temperature fluctuations. Mole-rats therefore display a relatively wide range of thermoregulation abilities. Some species cannot maintain their body temperatures at a constant level, whereas others employ behavioural thermoregulation...
2017: PloS One
https://www.readbyqxmd.com/read/28070288/getting-to-the-core-internal-body-temperatures-help-reveal-the-ecological-function-and-thermal-implications-of-the-lions-mane
#3
Paul Trethowan, Andrea Fuller, Anna Haw, Tom Hart, Andrew Markham, Andrew Loveridge, Robyn Hetem, Byron du Preez, David W Macdonald
It has been proposed that there is a thermal cost of the mane to male lions, potentially leading to increased body surface temperatures (Ts), increased sperm abnormalities, and to lower food intake during hot summer months. To test whether a mane imposes thermal costs on males, we measured core body temperature (Tb) continuously for approximately 1 year in 18 free-living lions. There was no difference in the 24-hr maximum Tb of males (n = 12) and females (n = 6), and males had a 24-hr mean Tb that was 0...
January 2017: Ecology and Evolution
https://www.readbyqxmd.com/read/28068165/physiological-and-perceived-effects-of-forearm-or-head-cooling-during-simulated-firefighting-activity-and-rehabilitation
#4
Susan Yeargin, Amy L McKenzie, Lindsey E Eberman, J Derek Kingsley, David J Dziedzicki, Patrick Yoder
CONTEXT:  Cooling devices aim to protect firefighters by attenuating a rise in body temperature. Devices for head cooling (HC) while firefighting and forearm cooling (FC) during rehabilitation (RHB) intervals are commonly marketed, but research regarding their efficacy is limited. OBJECTIVE:  To investigate the physiological and perceived effects of HC and FC during firefighting drills and RHB. DESIGN:  Randomized controlled clinical trial...
November 2016: Journal of Athletic Training
https://www.readbyqxmd.com/read/28065662/hot-heads-cool-bodies-the-conundrums-of-human-bat-activity-research
#5
REVIEW
Lonneke Bahler, Frits Holleman, Jan Booij, Joost B Hoekstra, Hein J Verberne
Brown adipose tissue is able to increase energy expenditure by converting glucose and fatty acids into heat. Therefore, BAT is able to increase energy expenditure and could thereby facilitate weight loss or at least weight maintenance. Since cold is a strong activator of BAT, most prospective research is performed during cold to activate BAT. In current research, there are roughly two methods of cooling. Cooling by lowering ambient air temperature, which uses a fixed temperature for all subjects and personalized cooling, which uses cooling blankets or vests with temperatures that can be adjusted to the individual set point of shivering...
January 5, 2017: European Journal of Internal Medicine
https://www.readbyqxmd.com/read/28060909/long-term-depletion-of-conventional-dendritic-cells-cannot-be-maintained-in-an-atherosclerotic-zbtb46-dtr-mouse-model
#6
Miche Rombouts, Nathalie Cools, Mandy O J Grootaert, Flore de Bakker, Ilse Van Brussel, An Wouters, Guido R Y De Meyer, Benedicte Y De Winter, Dorien M Schrijvers
BACKGROUND AND AIMS: Increased evidence suggests a pro-atherogenic role for conventional dendritic cells (cDC). However, due to the lack of an exclusive marker for cDC, their exact contribution to atherosclerosis remains elusive. Recently, a unique transcription factor was described for cDC, namely Zbtb46, enabling us to selectively target this cell type in mice. METHODS: Low-density lipoprotein receptor-deficient (Ldlr-/-) mice were transplanted with bone marrow from Zbtb46-diphtheria toxin receptor (DTR) transgenic mice following total body irradiation...
2017: PloS One
https://www.readbyqxmd.com/read/28060003/clinical-characteristics-of-mixed-arteriovenous-leg-ulcers-a-descriptive-study
#7
Joseph A Marin, Kevin Y Woo
PURPOSE: The purpose of this study was to identify the clinical characteristics of mixed arteriovenous leg ulcers (MLU) that differentiated them from venous leg ulcers (VLU). DESIGN: Secondary analysis of data from larger electronic database. SUBJECTS AND SETTING: The sample comprised 1007 persons with lower extremity ulcers. Two hundred sixty three individuals with MLU were compared to 744 individuals with VLU; their ankle brachial indices were 0...
January 2017: Journal of Wound, Ostomy, and Continence Nursing
https://www.readbyqxmd.com/read/28059520/the-role-of-electronic-and-phononic-excitation-in-the-optical-response-of-monolayer-ws2-after-ultrafast-excitation
#8
Claudia Ruppert, Alexey Chernikov, Heather M Hill, Albert F Rigosi, Tony F Heinz
Transient changes of the optical response of WS2 monolayers are studied by femtosecond broadband pump-probe spectroscopy. Time-dependent absorption spectra are analyzed by tracking the line width broadening, bleaching, and energy shift of the main exciton resonance as a function of time delay after the excitation. Two main sources for the pump-induced changes of the optical response are identified. Specifically, we find an interplay between modifications induced by many-body interactions from photoexcited carriers and by the subsequent transfer of the excitation to the phonon system followed by cooling of the material through the heat transfer to the substrate...
January 11, 2017: Nano Letters
https://www.readbyqxmd.com/read/28057077/ice-ingestion-with-a-long-rest-interval-increases-the-endurance-exercise-capacity-and-reduces-the-core-temperature-in-the-heat
#9
Takashi Naito, Yuka Iribe, Tetsuro Ogaki
BACKGROUND: The timing in which ice before exercise should be ingested plays an important role in optimizing its success. However, the effects of differences in the timing of ice ingestion before exercise on cycling capacity, and thermoregulation has not been studied. The aim of the present study was to assess the effect of length of time after ice ingestion on endurance exercise capacity in the heat. METHODS: Seven males ingested 1.25 g kg body mass(-1) of ice (0...
January 5, 2017: Journal of Physiological Anthropology
https://www.readbyqxmd.com/read/28056054/effect-of-dietary-types-on-feed-intakes-growth-performance-and-economic-benefit-in-tibetan-sheep-and-yaks-on-the-qinghai-tibet-plateau-during-cold-season
#10
Tianwei Xu, Shixiao Xu, Linyong Hu, Na Zhao, Zhe Liu, Li Ma, Hongjin Liu, Xinquan Zhao
Pastoralists on the Tibetan alpine rangeland suffered great economic loss in cold season, due to serious live-weight loss of domestic livestock under traditional grazing management. This study aimed to evaluate the effect of dietary types (crude protein levels) on feed intakes, growth performance and economic returns of local Tibetan sheep and yaks during cold season. Twenty-four yearling Tibetan sheep (25.29±3.95 kg LW) and twenty two-year-old yaks (100.62±4.55 kg LW) with familiar body conditions were randomly assigned to four groups, fed oats hay (OH), oats silage (OS), total mixed ration (TMR) and traditionally grazed on the local cool-season pasture (TG), respectively, over a 135-day experiment...
2017: PloS One
https://www.readbyqxmd.com/read/28054805/executive-function-and-parenting-in-the-context-of-homelessness
#11
Amy R Monn, Angela J Narayan, Amanda W Kalstabakken, Erin C Schubert, Ann S Masten
There is mounting evidence that maternal executive function (EF) plays a critical role in parenting behavior. However, the majority of the research on this topic has been conducted in low-risk samples. The purpose of the present study was to investigate whether individual differences in maternal EF are associated with parenting behavior in the high-risk, high adversity context of family homelessness. The study included 94 mothers and their children, ages 4 to 6 years, living in emergency homeless shelters. Mothers completed a battery of "hot" and "cool" EF tasks as well as a self-report questionnaire of perceived stress...
January 5, 2017: Journal of Family Psychology: JFP
https://www.readbyqxmd.com/read/28051939/ecologically-relevant-cooling-early-in-life-alters-prefledging-adrenocortical-response-in-free-living-songbirds
#12
Sharon E Lynn, Michael D Kern
In vertebrates, exposure to stressful stimuli early in development may alter the activity of the hypothalamo-pituitary-adrenal (HPA) axis, with the potential for fitness consequences later in life. For altricial species, whose young rely on their parents for food, warmth, and protection from predators, adult behavior can modify the impact of some stressors on their offspring after birth or hatching. We have shown that single bouts of cooling that normally occur when brooding females leave the nest elevate corticosterone secretion in very young free-living eastern bluebird (Sialia sialis) chicks...
January 2017: Physiological and Biochemical Zoology: PBZ
https://www.readbyqxmd.com/read/28051172/therapeutic-hypothermia-for-neonatal-encephalopathy-a-report-from-the-first-3-years-of-the-baby-cooling-registry-of-japan
#13
Kennosuke Tsuda, Takeo Mukai, Sachiko Iwata, Jun Shibasaki, Takuya Tokuhisa, Tomoaki Ioroi, Hiroyuki Sano, Nanae Yutaka, Akihito Takahashi, Akihito Takeuchi, Toshiki Takenouchi, Yuko Araki, Hisanori Sobajima, Masanori Tamura, Shigeharu Hosono, Makoto Nabetani, Osuke Iwata
Therapeutic hypothermia is recommended for moderate and severe neonatal encephalopathy, but is being applied to a wider range of neonates than originally envisaged. To examine the clinical use of therapeutic hypothermia, data collected during the first 3 years (2012-2014) of the Baby Cooling Registry of Japan were analysed. Of 485 cooled neonates, 96.5% were ≥36 weeks gestation and 99.4% weighed ≥1,800 g. Severe acidosis (pH < 7 or base deficit ≥16 mmol/L) was present in 68.9%, and 96.7% required resuscitation for >10 min...
January 4, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28050930/the-effects-of-crushed-ice-ingestion-prior-to-steady-state-exercise-in-the-heat
#14
Matthew Zimmermann, Grant Landers, Karen E Wallman, Jacinta Saldaris
This study examined the physiological effects of crushed ice ingestion prior to steady state exercise in the heat. Ten healthy males with age (23±3 y), height (176.9±8.7 cm), body-mass (73.5±8.0 kg), V̇O2peak (48.5±3.6 mL·kg·min(-1)) participated in the study. Participants completed 60 min of cycling at 55% of their V̇O2peak preceded by 30 min of pre-cooling whereby 7 g·kg(-1) of thermoneutral water (CON) or crushed ice (ICE) was ingested. The reduction in Tc at the conclusion of pre-cooling was greater in ICE (-0...
January 4, 2017: International Journal of Sport Nutrition and Exercise Metabolism
https://www.readbyqxmd.com/read/28042937/trigeminal-receptor-study-of-high-intensity-cooling-agents
#15
Sonya Johnson, Minmin Tian, Gloria Sheldon, Eric Dowd
Compounds capable of providing trigeminal effects are important to the flavor industry. Cooling agents activate a class of transient receptor potential (TRP) channels. The objective of this study was to evaluate the effect of 18 cooling agents by high-throughput screening through TRPM-8 and TRPA-1 channels. These coolants were further evaluated by a sensory analysis panel in a sucrose solution testing for a perceived activity. The results reveal that WS-5 activates both TRPA-1 and TRPM-8 receptor channels; WS-3 actives primarily TRPM-8, whereas FEMA-4557 activates the TRPA-1 channel...
January 11, 2017: Journal of Agricultural and Food Chemistry
https://www.readbyqxmd.com/read/28038481/selective-brain-cooling-after-traumatic-brain-injury-effects-of-three-different-cooling-methods-case-report
#16
Thomas Westermaier, Robert Nickl, Stefan Koehler, Patrick Fricke, Christian Stetter, Stefan Mark Rueckriegel, Ralf-Ingo Ernestus
Background In experimental models of neuronal damage, therapeutic hypothermia proved to be a powerful neuroprotective method. In clinical studies of traumatic brain injury (TBI), this very distinct effect was not reproducible. Several meta-analyses draw different conclusions about whether therapeutic hypothermia can improve outcome after TBI. Adverse side effects of systemic hypothermia, such as severe pneumonia, have been held responsible by some authors to counteract the neuroprotective effect. Selective brain cooling (SBC) attempts to take advantage of the protective effects of therapeutic hypothermia without the adverse side effects of systemic hypothermia...
December 30, 2016: Journal of Neurological Surgery. Part A, Central European Neurosurgery
https://www.readbyqxmd.com/read/28036109/developmental-effects-of-the-industrial-cooling-water-additives-morpholine-and-sodium-hypochlorite-on-lake-whitefish-coregonus-clupeaformis
#17
Christopher Thome, Charlotte Mitz, Shayenthiran Sreetharan, Charles Mitz, Christopher M Somers, Richard G Manzon, Douglas R Boreham, Joanna Y Wilson
Chemicals used in the prevention of corrosion and biofouling may be released into the environment via industrial cooling water discharges. We assessed the impacts of two commonly used chemicals, morpholine and sodium hypochlorite, on development in lake whitefish (Coregonus clupeaformis). Embryos were exposed chronically, beginning at fertilization or at the eyed stage. Acute 96 hour exposures were also examined at four development stages. Chronic morpholine resulted in an LC50 of 219 ± 54 mg/L when exposure began at fertilization and 674 ± 12 mg/L when exposure began at the eyed stage, suggesting that embryos are more sensitive earlier in development...
December 30, 2016: Environmental Toxicology and Chemistry
https://www.readbyqxmd.com/read/28010805/hybrid-cooling-vest-for-cooling-between-exercise-bouts-in-the-heat-effects-and-practical-considerations
#18
Albert P C Chan, Yang Yang, Wen-Fang Song, Del P Wong
While continuous cooling strategies may induce some ergonomic problems to occupational workers, cooling between work bouts may be an alternative for cooling them down in hot environments. The purpose of this study was to assess the effects of wearing a newly designed hybrid cooling vest (HCV) between two bouts of exercise. Inside a climatic chamber set at an air temperature of 37°C and a relative humidity of 60%, twelve male participants underwent two bouts of intermittent exercise interspersed with a 30min between-bout recovery session, during which HCV or a passive rest without any cooling (PAS) was administered...
January 2017: Journal of Thermal Biology
https://www.readbyqxmd.com/read/28009205/dynamics-of-a-ground-state-cooled-ion-colliding-with-ultracold-atoms
#19
Ziv Meir, Tomas Sikorsky, Ruti Ben-Shlomi, Nitzan Akerman, Yehonatan Dallal, Roee Ozeri
Ultracold atom-ion mixtures are gaining increasing interest due to their potential applications in ultracold and state-controlled chemistry, quantum computing, and many-body physics. Here, we studied the dynamics of a single ground-state cooled ion during few, to many, Langevin (spiraling) collisions with ultracold atoms. We measured the ion's energy distribution and observed a clear deviation from the Maxwell-Boltzmann distribution, characterized by an exponential tail, to a power-law distribution best described by a Tsallis function...
December 9, 2016: Physical Review Letters
https://www.readbyqxmd.com/read/28005584/postmortem-increase-in-body-core-temperature-how-inaccurate-we-can-be-in-time-since-death-calculations
#20
Tomáš Vojtíšek, Štěpánka Kučerová, Jan Krajsa, Bülent Eren, Petra Vysočanová, Petr Hejna
Postmortem increase in body core temperature is a well-known phenomenon in forensic practice. Despite this, cases of reliably documented postmortem hyperthermia are rarely reported in the forensic literature, and it is still not clear how frequently postmortem hyperthermia occurs and in which cases we may it predict. In routine forensic practice, the standard course of body cooling is expected, and the prediction of normal body core temperature in the time of death is used for back-calculating the time of death by Henssge method...
December 21, 2016: American Journal of Forensic Medicine and Pathology
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