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https://www.readbyqxmd.com/read/29906845/quantum-molecular-dynamics-of-warm-dense-iron-and-a-five-phase-equation-of-state
#1
Travis Sjostrom, Scott Crockett
Through quantum molecular dynamics (QMD), utilizing both Kohn-Sham (orbital-based) and orbital-free density functional theory, we calculate the equation of state of warm dense iron in the density range 7-30g/cm^{3} and temperatures from 1 to 100 eV. A critical examination of the iron pseudopotential is made, from which we find a significant improvement at high pressure to the previous QMD calculations of Wang et al. [Phys. Rev. E 89, 023101 (2014)10.1103/PhysRevE.89.023101]. Our results also significantly extend the ranges of density and temperature that were attempted in that prior work...
May 2018: Physical Review. E
https://www.readbyqxmd.com/read/29891774/genome-wide-identification-and-characterization-of-warming-related-genes-in-brassica-rapa-ssp-pekinensis
#2
Hayoung Song, Xiangshu Dong, Hankuil Yi, Ju Young Ahn, Keunho Yun, Myungchul Song, Ching-Tack Han, Yoonkang Hur
For sustainable crop cultivation in the face of global warming, it is important to unravel the genetic mechanisms underlying plant adaptation to a warming climate and apply this information to breeding. Thermomorphogenesis and ambient temperature signaling pathways have been well studied in model plants, but little information is available for vegetable crops. Here, we investigated genes responsive to warming conditions from two Brassica rapa inbred lines with different geographic origins: subtropical (Kenshin) and temperate (Chiifu)...
June 11, 2018: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/29891651/future-warming-increases-probability-of-globally-synchronized-maize-production-shocks
#3
Michelle Tigchelaar, David S Battisti, Rosamond L Naylor, Deepak K Ray
Meeting the global food demand of roughly 10 billion people by the middle of the 21st century will become increasingly challenging as the Earth's climate continues to warm. Earlier studies suggest that once the optimum growing temperature is exceeded, mean crop yields decline and the variability of yield increases even if interannual climate variability remains unchanged. Here, we use global datasets of maize production and climate variability combined with future temperature projections to quantify how yield variability will change in the world's major maize-producing and -exporting countries under 2 °C and 4 °C of global warming...
June 11, 2018: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/29803557/regulation-of-corneal-noradrenaline-release-and-topography-of-sympathetic-innervation-functional-implications-for-adrenergic-mechanisms-in-the-human-cornea
#4
Luis Figueira, Catarina Janeiro, Fatima Ferreirinha, Paula Serrao, Sara Perestrelo, Fernando Falcao-Reis, Paulo Correia-de-Sa, Daniel Moura
Having established a main neuronal origin for noradrenaline (NA) in the cornea, we set out to study the physiologic determinants of its release and to correlate functional findings with sympathetic nerve density and overall topography. Whole corneas were obtained from 3 to 4 month-old rabbits and human donors. Study of prejunctional effects was carried out after incubation with radiolabelled NA (3H-NA). Corneas were superfused with warm aerated amine-free medium with cocaine and hydrocortisone to block subsequent neuronal and extraneuronal NA uptake...
May 24, 2018: Experimental Eye Research
https://www.readbyqxmd.com/read/29801638/studies-on-chill-coma-recovery-in-the-ladybird-harmonia-axyridis-ontogenetic-profile-effect-of-repeated-cold-exposures-and-capacity-to-predict-winter-survival
#5
Michal Knapp, Philippe Vernon, David Renault
The harlequin ladybird, Harmonia axyridis, is one of the most successful invasive insect species worldwide. We investigated whether (i) chill coma recovery time (CCRt) changes during the ontogenetic development of this species, (ii) CCRt varies in response to repeated cold shocks, and (iii) CCRt could be a good predictor of winter survival ability in adults. CCRt decreased during larval development, the lowest CCRt values were observed in teneral adults (one and four days old), and significantly higher values were observed for older adults (16 and 32 days old)...
May 2018: Journal of Thermal Biology
https://www.readbyqxmd.com/read/29801621/culex-quinquefasciatus-say-larva-adapts-to-temperature-shock-through-changes-in-protein-turn-over-and-amino-acid-catabolism
#6
R V Ayana Gayathri, D A Evans
Exposure of Culex quinquefasciatus larvae to hypothermia or hyperthermia in relation to ecological temperature has resulted in alteration of enzyme activities related to maintenance of free amino acid pool and protein degradation. Sudden changes in water temperature have led to elevation of protein content particularly in molecular weight between 66 and 97.4 kDa. MALDI TOF analysis revealed the presence of putative uncharacterized protein and Phospholipase A2 activating protein in larvae subjected to 40°C for 1 hour which was not found in control and other temperature treated larvae...
May 2018: Journal of Thermal Biology
https://www.readbyqxmd.com/read/29776593/heat-shock-influences-the-fatty-acid-composition-of-the-muscle-of-the-antarctic-fish-trematomus-bernacchii
#7
C Truzzi, S Illuminati, M Antonucci, G Scarponi, A Annibaldi
In the Ross Sea region (average temperature of -1.87 °C), shelf water warming up to +0.8-+1.4 °C is predicted by 2200, so there is an urgent need to understand how organisms can respond to rising temperatures. In this study, we analyzed the effect of a heat shock on the fatty acid (FAs) composition of muscle of the Antarctic teleost Trematomus bernacchii, caught in Terra Nova Bay (Ross Sea), and held in fish tanks at 0, +1 or +2 °C, for 1, 5 and 10 days. In general, heat shock produced, beyond a reduction in total lipid content correlated to the temperature, an increase in the percentage of saturated FAs, and a decrease in mono-unsaturated FAs; however, the level of poly-unsaturated FAs did not seem to directly correlate with temperature...
April 3, 2018: Marine Environmental Research
https://www.readbyqxmd.com/read/29754331/cellular-stress-responses-to-chronic-heat-shock-and-shell-damage-in-temperate-mya-truncata
#8
Victoria A Sleight, Lloyd S Peck, Elisabeth A Dyrynda, Valerie J Smith, Melody S Clark
Acclimation, via phenotypic flexibility, is a potential means for a fast response to climate change. Understanding the molecular mechanisms underpinning phenotypic flexibility can provide a fine-scale cellular understanding of how organisms acclimate. In the last 30 years, Mya truncata populations around the UK have faced an average increase in sea surface temperature of 0.7 °C and further warming of between 1.5 and 4 °C, in all marine regions adjacent to the UK, is predicted by the end of the century...
May 12, 2018: Cell Stress & Chaperones
https://www.readbyqxmd.com/read/29739320/mobilization-of-retrotransposons-as-a-cause-of-chromosomal-diversification-and-rapid-speciation-the-case-for-the-antarctic-teleost-genus-trematomus
#9
J Auvinet, P Graça, L Belkadi, L Petit, E Bonnivard, A Dettaï, W H Detrich, C Ozouf-Costaz, D Higuet
BACKGROUND: The importance of transposable elements (TEs) in the genomic remodeling and chromosomal rearrangements that accompany lineage diversification in vertebrates remains the subject of debate. The major impediment to understanding the roles of TEs in genome evolution is the lack of comparative and integrative analyses on complete taxonomic groups. To help overcome this problem, we have focused on the Antarctic teleost genus Trematomus (Notothenioidei: Nototheniidae), as they experienced rapid speciation accompanied by dramatic chromosomal diversity...
May 9, 2018: BMC Genomics
https://www.readbyqxmd.com/read/29720454/data-driven-dynamical-model-indicates-that-the-heat-shock-response-in-chlamydomonas-reinhardtii-is-tailored-to-handle-natural-temperature-variation
#10
Stefano Magni, Antonella Succurro, Alexander Skupin, Oliver Ebenhöh
Global warming exposes plants to severe heat stress, with consequent crop yield reduction. Organisms exposed to high temperature stresses typically protect themselves with a heat shock response (HSR), where accumulation of unfolded proteins initiates the synthesis of heat shock proteins through the heat shock transcription factor HSF1. While the molecular mechanisms are qualitatively well characterized, our quantitative understanding of the underlying dynamics is still very limited. Here, we study the dynamics of HSR in the photosynthetic model organism Chlamydomonas reinhardtii with a data-driven mathematical model of HSR...
May 2018: Journal of the Royal Society, Interface
https://www.readbyqxmd.com/read/29718705/influence-of-ex-vivo-perfusion-on-the-biomolecular-profile-of-rat-lungs
#11
Caterina Lonati, Giulia A Bassani, Daniela Brambilla, Patrizia Leonardi, Andrea Carlin, Alice Faversani, Stefano Gatti, Franco Valenza
Despite increasing clinical adoption, biologic influences of ex vivo lung perfusion (EVLP) remain insufficiently elucidated. The aim of the current study was to investigate biomolecular changes induced by EVLP in rat lungs. EVLP was maintained for 180 min. Hyaluronan, mediators, and cells were assessed in the perfusate. Gene expression, signaling pathways, and ATP content were investigated in lung tissue. EVLP induced the release of medium-high molecular weight hyaluronan and transcription of hyaluronan synthases ( P < 0...
May 2, 2018: FASEB Journal: Official Publication of the Federation of American Societies for Experimental Biology
https://www.readbyqxmd.com/read/29694388/transcriptomic-study-to-understand-thermal-adaptation-in-a-high-temperature-tolerant-strain-of-pyropia-haitanensis
#12
Wenlei Wang, Fei Teng, Yinghui Lin, Dehua Ji, Yan Xu, Changsheng Chen, Chaotian Xie
Pyropia haitanensis, a high-yield commercial seaweed in China, is currently undergoing increasing levels of high-temperature stress due to gradual global warming. The mechanisms of plant responses to high temperature stress vary with not only plant type but also the degree and duration of high temperature. To understand the mechanism underlying thermal tolerance in P. haitanensis, gene expression and regulation in response to short- and long-term temperature stresses (SHS and LHS) was investigated by performing genome-wide high-throughput transcriptomic sequencing for a high temperature tolerant strain (HTT)...
2018: PloS One
https://www.readbyqxmd.com/read/29688561/integrative-transcriptional-and-metabolic-analyses-provide-insights-into-cold-spell-response-mechanisms-in-young-shoots-of-the-tea-plant
#13
Xinyuan Hao, Hu Tang, Bo Wang, Chuan Yue, Lu Wang, Jianming Zeng, Yajun Yang, Xinchao Wang
Green tea has attracted an increasing number of consumers worldwide due to its multiple health benefits. With the increase in global warming, more frequent cold spells in the spring often cause more serious damage to green tea production because of the young leaves used. We recorded the changes in climatic conditions during a typical cold spell and the damage symptoms caused by the cold spell in different tea cultivars and breeding lines. By simulating the low temperature of a cold spell under controlled conditions, comparative transcriptome and metabolic analyses were performed with sprouting shoots...
April 23, 2018: Tree Physiology
https://www.readbyqxmd.com/read/29663449/mild-hypothermia-33%C3%A2-c-increases-the-inducibility-of-atrial-fibrillation-an-in-vivo-large-animal-model-study
#14
Martin Manninger, Alessio Alogna, David Zweiker, Birgit Zirngast, Stefan Reiter, Viktoria Herbst, Heinrich Maechler, Burkert M Pieske, Frank R Heinzel, Helmut Brussee, Heiner Post, Daniel Scherr
OBJECTIVE: Application of therapeutic mild hypothermia in patients after resuscitation, often accompanied by myocardial infarction, cardiogenic shock, and systemic inflammation may impact on cardiac rhythm. We therefore tested susceptibility to atrial arrhythmias during hyperthermia (HT, 40.5°C), normothermia (NT, 38.0°C), and mild hypothermia (MH, 33.0°C). METHODS: Nine healthy, anesthetized closed-chest landrace pigs were instrumented with a quadripolar stimulation catheter in the high right atrium and a decapolar catheter in the coronary sinus...
April 16, 2018: Pacing and Clinical Electrophysiology: PACE
https://www.readbyqxmd.com/read/29573750/genome-wide-association-of-changes-in-swine-feeding-behaviour-due-to-heat-stress
#15
Amanda J Cross, Brittney N Keel, Tami M Brown-Brandl, Joseph P Cassady, Gary A Rohrer
BACKGROUND: Heat stress has a negative impact on pork production, particularly during the grow-finish phase. As temperature increases, feeding behaviour changes in order for pigs to decrease heat production. The objective of this study was to identify genetic markers associated with changes in feeding behaviour due to heat stress. Feeding data were collected on 1154 grow-finish pigs using an electronic feeding system from July 2011 to March 2016. In this study, days were classified based on the maximum temperature humidity index (THI) during the day as "Normal" (< 23...
March 25, 2018: Genetics, Selection, Evolution: GSE
https://www.readbyqxmd.com/read/29549990/geographic-variation-in-responses-of-european-yellow-dung-flies-to-thermal-stress
#16
Stephanie S Bauerfeind, Jesper G Sørensen, Volker Loeschcke, David Berger, E Dale Broder, Madeleine Geiger, Manuela Ferrari, Wolf U Blanckenhorn
Climatic conditions can be very heterogeneous even over small geographic scales, and are believed to be major determinants of the abundance and distribution of species and populations. Organisms are expected to evolve in response to the frequency and magnitude of local thermal extremes, resulting in local adaptation. Using replicate yellow dung fly (Scathophaga stercoraria; Diptera: Scathophagidae) populations from cold (northern Europe) and warm climates (southern Europe), we compared 1) responses to short-term heat and cold shocks in both sexes, 2) heat shock protein (Hsp70) expression in adults and eggs, and 3) female reproductive traits when facing short-term heat stress during egg maturation...
April 2018: Journal of Thermal Biology
https://www.readbyqxmd.com/read/29544329/path-integral-monte-carlo-simulations-of-dense-carbon-hydrogen-plasmas
#17
Shuai Zhang, Burkhard Militzer, Lorin X Benedict, François Soubiran, Philip A Sterne, Kevin P Driver
Carbon-hydrogen plasmas and hydrocarbon materials are of broad interest to laser shock experimentalists, high energy density physicists, and astrophysicists. Accurate equations of state (EOSs) of hydrocarbons are valuable for various studies from inertial confinement fusion to planetary science. By combining path integral Monte Carlo (PIMC) results at high temperatures and density functional theory molecular dynamics results at lower temperatures, we compute the EOSs for hydrocarbons from simulations performed at 1473 separate (ρ, T)-points distributed over a range of compositions...
March 14, 2018: Journal of Chemical Physics
https://www.readbyqxmd.com/read/29507734/divergence-in-the-transcriptional-landscape-between-low-temperature-and-freeze-shock-in-cultivated-grapevine-vitis-vinifera
#18
Jason P Londo, Alisson P Kovaleski, Jacquelyn A Lillis
Low-temperature stresses limit the sustainability and productivity of grapevines when early spring frosts damage young grapevine leaves. Spring conditions often expose grapevines to low, but not damaging, chilling temperatures and these temperatures have been shown to increase freeze resistance in other model systems. In this study, we examined whole-transcriptome gene expression patterns of young leaf tissue from cuttings of five different grapevine cultivars, exposed to chill and freeze shock, in order to understand the underlying transcriptional landscape associated with cold stress response...
2018: Horticulture Research
https://www.readbyqxmd.com/read/29456455/resilient-futures-of-a-small-island-a-participatory-approach-in-tenerife-canary-islands-to-address-climate-change
#19
Yeray Hernandez, Ângela Guimarães Pereira, Paulo Barbosa
Adaptation to climate change has been considered to be crucial to current societies, especially for small islands. In this paper the case of Tenerife (in the Canary Islands) is analysed. Tenerife is a small island located northwest of the African continent, in the Atlantic Ocean. Tenerife presents a high vulnerability to heatwaves and Saharan dust events as a consequence of its closeness to the Saharan desert. In fact, increasing frequency of heatwaves and Saharan dust events has been reported and could worsen in the future due to global warming...
February 2018: Environmental Science & Policy
https://www.readbyqxmd.com/read/29449855/microrna160-modulates-plant-development-and-heat-shock-protein-gene-expression-to-mediate-heat-tolerance-in-arabidopsis
#20
Jeng-Shane Lin, Chia-Chia Kuo, I-Chu Yang, Wei-An Tsai, Yu-Hsing Shen, Chih-Ching Lin, Yi-Chen Liang, Yu-Chi Li, Yun-Wei Kuo, Yu-Chi King, Hsi-Mei Lai, Shih-Tong Jeng
Global warming is causing a negative impact on plant growth and adversely impacts on crop yield. MicroRNAs (miRNAs) are critical in regulating the expression of genes involved in plant development as well as defense responses. The effects of miRNAs on heat-stressed Arabidopsis warrants further investigation. Heat stress increased the expression of miR160 and its precursors but considerably reduced that of its targets, ARF10, ARF16 , and ARF17 . To study the roles of miR160 during heat stress, transgenic Arabidopsis plants overexpressing miR160 precursor a (160OE) and artificial miR160 (MIM160), which mimics an inhibitor of miR160, were created...
2018: Frontiers in Plant Science
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