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https://www.readbyqxmd.com/read/28505720/first-principles-equation-of-state-table-of-silicon-and-its-effects-on-high-energy-density-plasma-simulations
#1
S X Hu, R Gao, Y Ding, L A Collins, J D Kress
Using density-functional theory-based molecular-dynamics simulations, we have investigated the equation of state for silicon in a wide range of plasma density and temperature conditions of ρ=0.001-500g/cm^{3} and T=2000-10^{8}K. With these calculations, we have established a first-principles equation-of-state (FPEOS) table of silicon for high-energy-density (HED) plasma simulations. When compared with the widely used SESAME-EOS model (Table 3810), we find that the FPEOS-predicted Hugoniot is ∼20% softer; for off-Hugoniot plasma conditions, the pressure and internal energy in FPEOS are lower than those of SESAME EOS for temperatures above T ≈ 1-10 eV (depending on density), while the former becomes higher in the low-T regime...
April 2017: Physical Review. E
https://www.readbyqxmd.com/read/28482796/effects-of-cold-acclimation-on-gene-expression-in-fall-field-cricket-gryllus-pennsylvanicus-ionoregulatory-tissues
#2
Lauren E Des Marteaux, Alexander H McKinnon, Hiroko Udaka, Jantina Toxopeus, Brent J Sinclair
BACKGROUND: Cold tolerance is a key determinant of temperate insect distribution and performance. Chill-susceptible insects lose ion and water homeostasis during cold exposure, but prior cold acclimation improves both cold tolerance and defense of homeostasis. The mechanisms underlying these processes are mostly unknown; cold acclimation is thought to enhance ion transport in the cold and/or prevent leak of water and ions. To identify candidate mechanisms of cold tolerance plasticity we generated transcriptomes of ionoregulatory tissues (hindgut and Malpighian tubules) from Gryllus pennsylvanicus crickets and compared gene expression in warm- and cold-acclimated individuals...
May 8, 2017: BMC Genomics
https://www.readbyqxmd.com/read/28439669/effects-of-desiccation-and-starvation-on-thermal-tolerance-and-the-heat-shock-response-in-forest-ants
#3
Andrew D Nguyen, Kerri DeNovellis, Skyler Resendez, Jeremy D Pustilnik, Nicholas J Gotelli, Joel D Parker, Sara Helms Cahan
Temperature increases associated with global climate change are likely to be accompanied by additional environmental stressors such as desiccation and food limitation, which may alter how temperature impacts organismal performance. To investigate how interactions between stressors influence thermal tolerance in the common forest ant, Aphaenogaster picea, we compared the thermal resistance of workers to heat shock with and without pre-exposure to desiccation or starvation stress. Knockdown (KD) time at 40.5 °C of desiccated ants was reduced 6% compared to controls, although longer exposure to desiccation did not further reduce thermal tolerance...
April 24, 2017: Journal of Comparative Physiology. B, Biochemical, Systemic, and Environmental Physiology
https://www.readbyqxmd.com/read/28414789/effect-of-ph-on-temperature-controlled-degradation-of-reactive-oxygen-species-heat-shock-protein-expression-and-mucosal-immunity-in-the-sea-cucumber-isostichopus-badionotus
#4
Mariel Gullian Klanian, Montserrat Terrats Preciat
This study evaluated the effect of pH on the activity of antioxidant and immune enzymes in the sea cucumber Isostichopus badionotus exposed to different temperatures. The organisms (530 ±110 g) were exposed to 16, 20, 24, 28, 30, 34 and 36°C for 6 h to evaluate thermal limits at two water pH values (treatment = 7.70; control = 8.17). For the thermal tolerance experiment, the organisms were exposed to sublethal temperature of 34°C for 3, 6, 12, 24, and 48 h. I. badionotus showed signs of thermal stress by synthesizing heat shock protein 70 (hsp70) at the cold (16°C) and warm thermal limits (34°C)...
2017: PloS One
https://www.readbyqxmd.com/read/28413684/physiological-effects-of-environmentally-relevant-multi-day-thermal-stress-on-wild-juvenile-atlantic-salmon-salmo-salar
#5
Emily Corey, Tommi Linnansaari, Richard A Cunjak, Suzanne Currie
The frequency of extreme thermal events in temperate freshwater systems is expected to increase alongside global surface temperature. The Miramichi River, located in eastern Canada, is a prominent Atlantic salmon (Salmo salar) river where water temperatures can exceed the proposed upper thermal limit for the species (~27°C). Current legislation closes the river to recreational angling when water temperatures exceed 20°C for two consecutive nights. We aimed to examine how natural thermal variation, representative of extreme high thermal events, affected the thermal tolerance and physiology of wild, juvenile Atlantic salmon...
2017: Conservation Physiology
https://www.readbyqxmd.com/read/28322249/the-protective-effects-of-shikonin-on-hepatic-ischemia-reperfusion-injury-are-mediated-by-the-activation-of-the-pi3k-akt-pathway
#6
Tong Liu, QingHui Zhang, Wenhui Mo, Qiang Yu, Shizan Xu, Jingjing Li, Sainan Li, Jiao Feng, Liwei Wu, Xiya Lu, Rong Zhang, Linqiang Li, Keran Cheng, Yuqing Zhou, Shunfeng Zhou, Rui Kong, Fan Wang, Weiqi Dai, Kan Chen, Yujing Xia, Jie Lu, Yingqun Zhou, Yan Zhao, Chuanyong Guo
Hepatic ischemia/reperfusion (I/R) injury, which can result in severe liver injury and dysfunction, occurs in a variety of conditions such as liver transplantation, shock, and trauma. Cell death in hepatic I/R injury has been linked to apoptosis and autophagy. Shikonin plays a significant protective role in ischemia/reperfusion injury. The purpose of the present study was to investigate the protective effect of shikonin on hepatic I/R injury and explore the underlying mechanism. Mice were subjected to segmental (70%) hepatic warm ischemia to induce hepatic I/R injury...
March 21, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28315162/dietary-supplementation-of-curcumin-augments-heat-stress-tolerance-through-upregulation-of-nrf-2-mediated-antioxidative-enzymes-and-hsps-in-puntius-sophore
#7
Arabinda Mahanty, Sasmita Mohanty, Bimal P Mohanty
Heat stress is one of the major environmental concerns in global warming regime and rising temperature has resulted in mass mortalities of animals including fishes. Therefore, strategies for high temperature stress tolerance and ameliorating the effects of heat stress are being looked for. In an earlier study, we reported that Nrf-2 (nuclear factor E2-related factor 2) mediated upregulation of antioxidative enzymes and heat shock proteins (Hsps) provide survivability to fish under heat stress. In this study, we have evaluated the ameliorative potential of dietary curcumin, a potential Nrf-2 inducer in heat stressed cyprinid Puntius sophore...
March 17, 2017: Fish Physiology and Biochemistry
https://www.readbyqxmd.com/read/28296881/transcriptomic-responses-to-environmental-temperature-by-turtles-with-temperature-dependent-and-genotypic-sex-determination-assessed-by-rnaseq-inform-the-genetic-architecture-of-embryonic-gonadal-development
#8
Srihari Radhakrishnan, Robert Literman, Jennifer Neuwald, Andrew Severin, Nicole Valenzuela
Vertebrate sexual fate is decided primarily by the individual's genotype (GSD), by the environmental temperature during development (TSD), or both. Turtles exhibit TSD and GSD, making them ideal to study the evolution of sex determination. Here we analyze temperature-specific gonadal transcriptomes (RNA-sequencing validated by qPCR) of painted turtles (Chrysemys picta TSD) before and during the thermosensitive period, and at equivalent stages in soft-shell turtles (Apalone spinifera-GSD), to test whether TSD's and GSD's transcriptional circuitry is identical but deployed differently between mechanisms...
2017: PloS One
https://www.readbyqxmd.com/read/28228019/equation-of-state-and-shock-compression-of-warm-dense-sodium-a-first-principles-study
#9
Shuai Zhang, Kevin P Driver, François Soubiran, Burkhard Militzer
As one of the simple alkali metals, sodium has been of fundamental interest for shock physics experiments, but knowledge of its equation of state (EOS) in hot, dense regimes is not well known. By combining path integral Monte Carlo (PIMC) results for partially ionized states [B. Militzer and K. P. Driver, Phys. Rev. Lett. 115, 176403 (2015)] at high temperatures and density functional theory molecular dynamics (DFT-MD) results at lower temperatures, we have constructed a coherent equation of state for sodium over a wide density-temperature range of 1...
February 21, 2017: Journal of Chemical Physics
https://www.readbyqxmd.com/read/28062700/intravital-imaging-of-neutrophil-recruitment-reveals-the-efficacy-of-fpr1-blockade-in-hepatic-ischemia-reperfusion-injury
#10
Masaki Honda, Takayuki Takeichi, Shintaro Hashimoto, Daiki Yoshii, Kaori Isono, Shintaro Hayashida, Yuki Ohya, Hidekazu Yamamoto, Yasuhiko Sugawara, Yukihiro Inomata
Neutrophils are considered responsible for the pathophysiological changes resulting from hepatic ischemia-reperfusion (I/R) injury, which is a complication of trauma, shock, liver resection, and transplantation. Recently, evidence is accumulating that formyl-peptide receptor (FPR) signaling constitutes an important danger signal that guides neutrophils to sites of inflammation. This study aimed to investigate dynamic neutrophil recruitment using two-photon laser-scanning microscopy (TPLSM) in response to FPR1 blockade during hepatic I/R...
January 6, 2017: Journal of Immunology: Official Journal of the American Association of Immunologists
https://www.readbyqxmd.com/read/27995990/long-term-acclimation-to-different-thermal-regimes-affects-molecular-responses-to-heat-stress-in-a-freshwater-clam-corbicula-fluminea
#11
Halina I Falfushynska, Tuan Phan, Inna M Sokolova
Global climate change (GCC) can negatively affect freshwater ecosystems. However, the degree to which freshwater populations can acclimate to long-term warming and the underlying molecular mechanisms are not yet fully understood. We used the cooling water discharge (CWD) area of a power plant as a model for long-term warming. Survival and molecular stress responses (expression of molecular chaperones, antioxidants, bioenergetic and protein synthesis biomarkers) to experimental warming (20-41 °C, +1.5 °C per day) were assessed in invasive clams Corbicula fluminea from two pristine populations and a CWD population...
December 20, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27975298/capsaicin-partially-mimics-heat-in-mouse-fibroblast-cells-in-vitro
#12
COMPARATIVE STUDY
Naotoshi Sugimoto, Masanori Katakura, Kentaro Matsuzaki, Hiroyuki Nakamura, Akihiro Yachie, Osamu Shido
Capsaicin activates transient receptor potential vanilloid 1 (TRPV1), a cation channel in the transient receptor potential family, resulting in the transient entry of Ca(2+) and Mg(2+) and a warm sensation. However, the effects of capsaicin on cells have not fully elucidated in fibroblasts. In this study, we investigated whether capsaicin could induce signal transduction in mouse fibroblast cells and compared the effect with that of heat-induced signal transduction. The activation of the mitogen-activated protein kinases (MAPKs) ERK and p38 MAPK, expression levels of heat shock protein 70 (HSP70) and HSP90, actin assembly, and cell proliferation were analyzed in NIH3T3 mouse fibroblast cells...
March 2017: Naunyn-Schmiedeberg's Archives of Pharmacology
https://www.readbyqxmd.com/read/27894882/comparing-biomarker-responses-during-thermal-acclimation-a-lethal-vs-non-lethal-approach-in-a-tropical-reef-clownfish
#13
Carolina Madeira, Diana Madeira, Mário S Diniz, Henrique N Cabral, Catarina Vinagre
Knowledge of thermal stress biology for most tropical fish species in reef ecosystems under climate change is still quite limited. Thus, the objective of this study was to measure the time-course changes of thermal stress biomarkers in the commercially exploited coral reef fish Amphiprion ocellaris, during a laboratory simulated event of increased temperature. Heat shock protein 70kDa (Hsp70) and total ubiquitin (Ub) were determined in the muscle (lethal method) and in the fin (non-lethal alternative method) under two temperature treatments (control - 26°C and elevated temperature - 30°C) throughout one month with weekly samplings...
February 2017: Comparative Biochemistry and Physiology. Part A, Molecular & Integrative Physiology
https://www.readbyqxmd.com/read/27829710/early-norepinephrine-decreases-fluid-and-ventilatory-requirements-in-pediatric-vasodilatory-septic-shock
#14
Suchitra Ranjit, Rajeswari Natraj, Sathish Kumar Kandath, Niranjan Kissoon, Balasubramaniam Ramakrishnan, Paul E Marik
AIMS: We previously reported that vasodilatation was common in pediatric septic shock, regardless of whether they were warm or cold, providing a rationale for early norepinephrine (NE) to increase venous return (VR) and arterial tone. Our primary aim was to evaluate the effect of smaller fluid bolus plus early-NE versus the American College of Critical Care Medicine (ACCM) approach to more liberal fluid boluses and vasoactive-inotropic agents on fluid balance, shock resolution, ventilator support and mortality in children with septic shock...
October 2016: Indian Journal of Critical Care Medicine
https://www.readbyqxmd.com/read/27627404/dissociation-along-the-principal-hugoniot-of-the-laser-m%C3%A3-gajoule-ablator-material
#15
P Colin-Lalu, V Recoules, G Salin, T Plisson, E Brambrink, T Vinci, R Bolis, G Huser
Glow discharge polymer hydrocarbon (GDP-CH) is used as the ablator material in inertial confinement fusion (ICF) capsules for the Laser Mégajoule and National Ignition Facility. Due to its fabrication process, GDP-CH chemical composition and structure differ from commercially available plastics and detailed knowledge of its properties in the warm dense matter regime is needed to achieve accurate design of ICF capsules. First-principles ab initio simulations of the GDP-CH principal Hugoniot up to 8 Mbar were performed using the quantum molecular dynamics (QMD) code abinit and showed that atomic bond dissociation has an effect on the compressibility...
August 2016: Physical Review. E
https://www.readbyqxmd.com/read/27606618/translation-regulation-and-rna-granule-formation-after-heat-shock-of-procyclic-form-trypanosoma-brucei-many-heat-induced-mrnas-are-also-increased-during-differentiation-to-mammalian-infective-forms
#16
Igor Minia, Clementine Merce, Monica Terrao, Christine Clayton
African trypanosome procyclic forms multiply in the midgut of tsetse flies, and are routinely cultured at 27°C. Heat shocks of 37°C and above result in general inhibition of translation, and severe heat shock (41°C) results in sequestration of mRNA in granules. The mRNAs that are bound by the zinc-finger protein ZC3H11, including those encoding refolding chaperones, escape heat-induced translation inhibition. At 27°C, ZC3H11 mRNA is predominantly present as an untranslated cytosolic messenger ribonucleoprotein particle, but after heat shocks of 37°C-41°C, the ZC3H11 mRNA moves into the polysomal fraction...
September 2016: PLoS Neglected Tropical Diseases
https://www.readbyqxmd.com/read/27595556/anaerobic-metabolism-and-thermal-tolerance-the-importance-of-opine-pathways-on-survival-of-a-gastropod-after-cardiac-dysfunction
#17
Guodong Han, Shu Zhang, Yunwei Dong
Organisms on the rocky shore frequently suffer from high temperature, which consequently causes disability of cardiac function and retards the cellular oxygen delivery. However, some gastropods can survive in several Celsius degrees higher than their Arrhenius break temperature of cardiac function (ABT), indicating the importance of anaerobic metabolism for their thermal tolerance. We measured the global molecular responses to heat stress in limpet Cellana toreuma using 454 GS-FLX to investigate the variations of genes involving in anaerobic metabolism at high temperature...
September 5, 2016: Integrative Zoology
https://www.readbyqxmd.com/read/27591318/comparative-physiological-biochemical-and-molecular-thermal-stress-response-profiles-for-two-unionid-freshwater-mussel-species
#18
Samantha L Payton, Paul D Johnson, Matthew J Jenny
Freshwater mussels, aquatic keystone species, are in global decline. Long life spans, sedentary lifestyles, and unique reproductive strategies involving obligate parasitic stages make unionid freshwater mussels particularly sensitive to environmental perturbations resulting from global climate change. A greater understanding of the mechanisms by which closely related species differ in their response to thermal challenge is critical for successful conservation and management practices. As such, both an acute heat shock and a chronic warming simulation were conducted in order to evaluate responses between hypothesized thermally tolerant (Villosa lienosa) and thermally sensitive (Villosa nebulosa) freshwater mussels in response to predicted thermal warming...
November 15, 2016: Journal of Experimental Biology
https://www.readbyqxmd.com/read/27586989/-the-452th-case-rash-hypotension-abdominal-pain-and-headache
#19
S N Bian, H H Yang, Q Wang, D Xu, Y Zhao
Systemic lupus erythematosus (SLE) is an autoimmune disease characterized with multiple organ involvements. Acute acalculous cholecystitis(AAC) is an extremely rare manifestation of digestive system involvement in SLE. We reported a case of 32-year-old woman who complained skin rashes for two weeks and stomachache and oliguria for one day. She had rashes at onset, and developed fever, stomachache, hypotension and headache. Physical examination at admission indicated blood pressure 76/47 mmHg(1 mmHg=0.133 kPa), heart rate 107 beats/min, warm acra...
September 1, 2016: Zhonghua Nei Ke za Zhi [Chinese Journal of Internal Medicine]
https://www.readbyqxmd.com/read/27561907/use-of-methylene-blue-to-treat-hypovolemic-shock-followed-by-ischemia-reperfusion-injury-in-the-postoperative-orthotopic-liver-transplant-patient-a-case-report
#20
Kelvin Henrique Vilalva, Fabrícia Teixeira Mumic, Marina Rodrigues Garcia Silveira, Enio David Mente, Paulo Roberto Barbosa Evora, Orlando Castro E Silva
A 57-year-old female patient received elective liver transplant due to nonalcoholic steatohepatitis complicated by hepatocellular carcinoma. Her preoperative Model for End-Stage Liver Disease score was 11. The total transplant ischemic time was 10 hours and 35 minutes, and the warm ischemic time was 35 minutes. Even with aggressive fluid overload and use of high concentrations of vasoactive amines, the patient developed possible primary graft dysfunction with poor response to fluids and vasopressor support, suggesting vasoplegic syndrome...
August 24, 2016: Experimental and Clinical Transplantation
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