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https://www.readbyqxmd.com/read/29350938/cyclotron-orbits-of-composite-fermions-in-the-fractional-quantum-hall-regime
#1
Insun Jo, Hao Deng, Yang Liu, L N Pfeiffer, K W West, K W Baldwin, M Shayegan
We study a bilayer GaAs hole system that hosts two distinct many-body phases at low temperatures and high perpendicular magnetic fields. The higher-density (top) layer develops a Fermi sea of composite fermions (CFs) in its half-filled lowest Landau level, while the lower-density (bottom) layer forms a Wigner crystal (WC) as its filling becomes very small. Owing to the interlayer interaction, the CFs in the top layer feel the periodic Coulomb potential of the WC in the bottom layer. We measure the magnetoresistance of the top layer while changing the bottom-layer density...
January 5, 2018: Physical Review Letters
https://www.readbyqxmd.com/read/29350740/full-dimensional-analytical-potential-energy-surface-describing-the-gas-phase-cl-c2h6-reaction-and-kinetics-study-of-rate-constants-and-kinetic-isotope-effects
#2
Cipriano Rangel, Joaquin Espinosa-Garcia
Within the Born-Oppenheimer approximation a full-dimensional analytical potential energy surface, PES-2017, was developed for the gas-phase hydrogen abstraction reaction between the chlorine atom and ethane, which is a nine body system. This surface presents a valence-bond/molecular mechanics functional form dependent on 60 parameters and is fitted to high-level ab initio calculations. This reaction presents little exothermicity, -2.30 kcal mol-1, with a low height barrier, 2.44 kcal mol-1, and intermediate complexes in the entrance and exit channels...
January 19, 2018: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/29348199/origins-of-low-symmetry-phases-in-asymmetric-diblock-copolymer-melts
#3
Kyungtae Kim, Akash Arora, Ronald M Lewis, Meijiao Liu, Weihua Li, An-Chang Shi, Kevin D Dorfman, Frank S Bates
Cooling disordered compositionally asymmetric diblock copolymers leads to the formation of nearly spherical particles, each containing hundreds of molecules, which crystallize upon cooling below the order-disorder transition temperature (TODT). Self-consistent field theory (SCFT) reveals that dispersity in the block degrees of polymerization stabilizes various Frank-Kasper phases, including the C14 and C15 Laves phases, which have been accessed experimentally in low-molar-mass poly(isoprene)-b-poly(lactide) (PI-PLA) diblock copolymers using thermal processing strategies...
January 18, 2018: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/29346953/quantum-statistical-effects-in-the-mass-transport-of-interstitial-solutes-in-a-crystalline-solid
#4
C H Woo, Haohua Wen
The impact of quantum statistics on the many-body dynamics of a crystalline solid at finite temperatures containing an interstitial solute atom (ISA) is investigated. The Mori-Zwanzig theory allows the many-body dynamics of the crystal to be formulated and solved analytically within a pseudo-one-particle approach using the Langevin equation with a quantum fluctuation-dissipation relation (FDR) based on the Debye model. At the same time, the many-body dynamics is also directly solved numerically via the molecular dynamics approach with a Langevin heat bath based on the quantum FDR...
September 2017: Physical Review. E
https://www.readbyqxmd.com/read/29346048/risk-factors-and-prognostic-indicators-for-surgical-outcome-of-dogs-with-esophageal-foreign-body-obstructions
#5
Brigitte A Brisson, Shannon H Wainberg, Sarah Malek, Stephanie Reabel, Alice Defarges, William C Sears
OBJECTIVE To determine risk factors for surgical intervention, complications, and outcome in dogs with an esophageal foreign body (EFB). DESIGN Retrospective observational study. ANIMALS 224 incidents of EFB in 223 dogs evaluated at a veterinary teaching hospital from 1995 through 2014. PROCEDURES Hospital records were reviewed to collect data regarding signalment, history, clinical signs, EFB type and location, procedures, complications, and outcomes. Breed distributions were compared between dogs with EFB and the entire canine patient population during the study period...
February 1, 2018: Journal of the American Veterinary Medical Association
https://www.readbyqxmd.com/read/29339061/dose-dependent-photochemical-photothermal-toxicity-of-indocyanine-green-based-therapy-on-three-different-cancer-cell-lines
#6
Mustafa Kemal Ruhi, Ayşe Ak Can, Murat Gülsoy
The Food and Drug Administration-approved Indocyanine Green can be used as a photosensitizer to kill cancer cells selectively. Although indocyanine green is advantageous as a photosensitizer in terms of strong absorption in the near-infrared region, indocyanine green-based cancer treatment is still not approved as a clinical method. Some reasons for this are aggregation at high concentrations, rapid clearance of the photosensitizer from the body, low singlet oxygen quantum yield, and the uncertainty concerning its action mechanism...
January 12, 2018: Photodiagnosis and Photodynamic Therapy
https://www.readbyqxmd.com/read/29337567/ultrafast-graphene-light-emitter
#7
Young Duck Kim, Yuanda Gao, Ren-Jye Shiue, Lei Wang, Ozgur Burak Aslan, Myung-Ho Bae, Hyungsik Kim, Dongjea Seo, Heon-Jin Choi, Suk Hyun Kim, Andrei Nemilentsau, Tony Low, Cheng Tan, Dmitri K Efetov, Takashi Taniguchi, Kenji Watanabe, Kenneth L Shepard, Tony F Heinz, Dirk Englund, James C Hone
Ultrafast electrically driven nanoscale light sources are critical components in nanophotonics. Compound semiconductor-based light sources for the nanophotonic platforms have been extensively investigated over the past decades. However, monolithic ultrafast light sources with a small footprint remain a challenge. Here, we demonstrate electrically driven ultrafast graphene light emitters that achieve light pulse generation with up to 10 GHz bandwidth, across a broad spectral range from the visible to the near-infrared...
January 16, 2018: Nano Letters
https://www.readbyqxmd.com/read/29332061/design-and-implementation-of-an-advanced-telemedicine-model-for-the-rural-people-of-bangladesh
#8
Uzzal Kumar Prodhan, Mohammad Zahidur Rahman, Israt Jahan
OBJECTIVES: Telemedicine based healthcare service faces different difficulties especially in the remote people of Bangladesh. The objective of this study was to implement an advanced telemedicine model in order to provide the healthcare services for the rural people of Bangladesh. METHODS: We developed the telemedicine model using an ardunio based low cost portable telemedicine tool kit by interfacing android application. Then we collected ECG, blood pressure, temperature, concentration of glucose in blood, SPO2, body position, airflow, height and weight through our developed model...
January 5, 2018: Technology and Health Care: Official Journal of the European Society for Engineering and Medicine
https://www.readbyqxmd.com/read/29330589/impact-of-valve-less-vs-standard-insufflation-on-pneumoperitoneum-volume-inflammation-and-peritoneal-physiology-in-a-laparoscopic-sigmoid-resection-experimental-model
#9
Michele Diana, Eric Noll, Andras Legnèr, Seong-Ho Kong, Yu-Yin Liu, Luigi Schiraldi, Francesco Marchegiani, Jordan Bano, Bernard Geny, Anne-Laure Charles, Bernard Dallemagne, Véronique Lindner, Didier Mutter, Pierre Diemunsch, Jacques Marescaux
BACKGROUND: Standard insufflators compensate for intra-abdominal pressure variations with pressure spikes. Our aim was to evaluate the impact of a stable, low-pressure pneumoperitoneum induced by a valve-less insufflator, on working space, hemodynamics, inflammation, and peritoneal physiology, in a model of laparoscopic sigmoid resection. MATERIALS AND METHODS: Twelve pigs (47 ± 3.3 kg) were equipped for invasive hemodynamic monitoring and randomly assigned to Standard (n = 6) vs...
January 12, 2018: Surgical Endoscopy
https://www.readbyqxmd.com/read/29328691/landau-phonon-roton-theory-revisited-for-superfluid-4-he-and-fermi-gases
#10
Yvan Castin, Alice Sinatra, Hadrien Kurkjian
Liquid helium and spin-1/2 cold-atom Fermi gases both exhibit in their superfluid phase two distinct types of excitations, gapless phonons and gapped rotons or fermionic pair-breaking excitations. In the long wavelength limit, revising and extending the theory of Landau and Khalatnikov initially developed for helium [Zh. Exp. Teor. Fiz. 19, 637 (1949)], we obtain universal expressions for three- and four-body couplings among these two types of excitations. We calculate the corresponding phonon damping rates at low temperature and compare them to those of a pure phononic origin in high-pressure liquid helium and in strongly interacting Fermi gases, paving the way to experimental observations...
December 29, 2017: Physical Review Letters
https://www.readbyqxmd.com/read/29325094/functional-rescue-of-misfolding-abca3-mutations-by-small-molecular-correctors
#11
Susanna Kinting, Stefanie Höppner, Ulrike Schindlbeck, Maria E Forstner, Jacqueline Harfst, Thomas Wittmann, Matthias Griese
ABCA3, a phospholipid transporter in lung lamellar bodies (LB), is essential for the assembly of pulmonary surfactant and LB biogenesis. Mutations in the ABCA3 gene are an important genetic cause for respiratory distress syndrome in neonates and interstitial lung disease in children and adults, for which there is currently no cure.The aim of this study was to prove that disease causing misfolding ABCA3 mutations can be corrected in vitro and to investigate available options for correction.We stably expressed HA-tagged wild type ABCA3 or variants p...
January 9, 2018: Human Molecular Genetics
https://www.readbyqxmd.com/read/29323039/neuronal-injury-and-tumor-necrosis-factor-alpha-immunoreactivity-in-the-rat-hippocampus-in-the-early-period-of-asphyxia-induced-cardiac-arrest-under-normothermia
#12
Hyun-Jin Tae, Il Jun Kang, Tae-Kyeong Lee, Jeong Hwi Cho, Jae-Chul Lee, Myoung Cheol Shin, Yoon Sung Kim, Jun Hwi Cho, Jong-Dai Kim, Ji Hyeon Ahn, Joon Ha Park, In-Shik Kim, Hyang-Ah Lee, Yang Hee Kim, Moo-Ho Won, Young Joo Lee
Low survival rate occurs in patients who initially experience a spontaneous return of circulation after cardiac arrest (CA). In this study, we induced asphyxial CA in adult male Sprague-Daley rats, maintained their body temperature at 37 ± 0.5°C, and then observed the survival rate during the post-resuscitation phase. We examined neuronal damage in the hippocampus using cresyl violet (CV) and Fluore-Jade B (F-J B) staining, and pro-inflammatory response using ionized calcium-binding adapter molecule 1 (Iba-1), glial fibrillary acidic protein (GFAP), and tumor necrosis factor-alpha (TNF-α) immunohistochemistry in the hippocampus after asphyxial CA in rats under normothermia...
December 2017: Neural Regeneration Research
https://www.readbyqxmd.com/read/29320155/transparent-and-waterproof-ionic-liquids-based-fibers-for-highly-durable-multifunctional-sensors-and-strain-insensitive-stretchable-conductors
#13
Song Chen, Haizhou Liu, Shuqi Liu, Pingping Wang, Songshan Zeng, Luyi Sun, Lan Liu
Ionic liquids (ILs) are regarded as ideal components in the next generation of strain sensors because their ultralow modulus can commendably circumvent or manage the mechanical mismatch in traditional strain sensors. In addition to strain sensors, stretchable conductors with strain-insensitive conductance are also indispensable in artificial systems for connecting and transporting electrons, similar to the function of blood vessels in the human body. In this work, two types of ILs-based conductive fibers were fabricated by developing hollow fibers with specific micro-scale channels which were then filled with ILs...
January 10, 2018: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29318413/evaluation-of-postoperative-fever-after-surgical-correction-of-neuromuscular-scoliosis-implication-on-management
#14
Mohamed Abdelhamid Ali Yousef, Scott Rosenfeld
BACKGROUND: Scoliosis is a common deformity in patients with neuromuscular disorders which usually necessitates surgical correction. Patients with neuromuscular scoliosis are characterized by increased incidence of associated medical co-morbidities and higher postoperative complication rate; therefore, these patients are often managed with a wide multidisciplinary care team. Postoperative fever is a frequent complication after surgery which is often routinely investigated using different workup tests to rule out infection...
January 9, 2018: European Spine Journal
https://www.readbyqxmd.com/read/29305660/psychophysiological-body-composition-biomechanical-and-autonomic-modulation-analysis-procedures-in-an-ultraendurance-mountain-race
#15
Pedro Belinchon-deMiguel, Vicente Javier Clemente-Suárez
The current research aimed to analyze psychophysiological, body composition, biomechanical and autonomic modifications in an ultraendurance mountain race. We analyzed 11 finisher voluntary athletes that participated in a 51.2 km ultraendurance mountain race. We measured before and after the mountain ultraendurance event the following parameters: Rate of perceived exertion, body composition, cortical arousal, blood pressure, body temperature, forced vital capacity, blood oxygen saturation, isometric hand strength and heart rate variability parameters...
January 5, 2018: Journal of Medical Systems
https://www.readbyqxmd.com/read/29303352/anomalous-composition-induced-crossover-in-the-magnetic-properties-of-the-itinerant-electron-antiferromagnet-ca_-1-x-sr_-x-co_-2-y-as_-2
#16
N S Sangeetha, V Smetana, A-V Mudring, D C Johnston
The inference of Ying et al. [Europhys. Lett. 104, 67005 (2013)EULEEJ0295-507510.1209/0295-5075/104/67005] of a composition-induced change from c-axis ordered-moment alignment in a collinear A-type antiferromagnetic (AFM) structure at small x to ab-plane alignment in an unknown AFM structure at larger x in Ca_{1-x}Sr_{x}Co_{2-y}As_{2} with the body-centered tetragonal ThCr_{2}Si_{2} structure is confirmed. Our major finding is an anomalous magnetic behavior in the crossover region 0.2≲x≲0.3 between these two phases...
December 22, 2017: Physical Review Letters
https://www.readbyqxmd.com/read/29303118/universal-many-body-response-of-heavy-impurities-coupled-to-a-fermi-sea-a-review-of-recent-progress
#17
Richard Schmidt, Michael Knap, Dmitri A Ivanov, Jhih-Shih You, Marko Cetina, Eugene Demler
In this report we discuss the dynamical response of heavy quantum impurities immersed in a Fermi gas at zero and at finite temperature. Studying both the frequency and the time domain allows one to identify interaction regimes that are characterized by distinct many-body dynamics. From this theoretical study a picture emerges in which impurity dynamics is universal on essentially all time scales, and where the high-frequency few-body response is related to the long-time dynamics of the Anderson orthogonality catastrophe by Tan relations...
February 2018: Reports on Progress in Physics
https://www.readbyqxmd.com/read/29301701/thermoregulatory-challenges-in-the-habitat-of-the-world-s-smallest-tortoise-chersobius-signatus
#18
Victor J T Loehr
Ectotherms have various means of dealing with low environmental temperatures, but relatively few species have been rigorously investigated. Consequently, we have little information to predict how ectotherm populations might respond to global temperature changes. Tortoises from temperate and subtropical regions often overcome periodically cool conditions by hibernation, but speckled dwarf tortoises (Chersobius signatus) need to remain active to exploit ephemeral resources in their arid winter-rainfall habitat...
January 2018: Journal of Thermal Biology
https://www.readbyqxmd.com/read/29301682/altitude-influences-thermal-ecology-and-thermal-sensitivity-of-locomotor-performance-in-a-toad-headed-lizard
#19
Qiong Wu, Wei Dang, Ying-Chao Hu, Hong-Liang Lu
Population differentiation in ectotherm physiological performance may be driven by adapting to different thermal environments. In this study, we measured locomotor performance in two different altitude populations of the Qinghai toad-headed lizards (Phrynocephalus vlangalii) at different test temperatures to assess between-population differences in thermal sensitivity of sprint speed. Low-elevation lizards ran faster than high-elevation lizards at most test temperatures. Sprint speed varied with test temperature similarly between populations, but the thermal sensitivity (performance breadth) differed significantly...
January 2018: Journal of Thermal Biology
https://www.readbyqxmd.com/read/29299670/flexibility-is-the-key-metabolic-and-thermoregulatory-behaviour-in-a-small-endotherm
#20
Franz Langer, Nadine Havenstein, Joanna Fietz
Hibernation is the most effective way to reduce thermoregulatory costs during periods of unfavourable environmental conditions. In preparation to hibernation, fat-storing hibernators accumulate large quantities of body fat, which increases their locomotor costs and also the risk of predation. As a consequence, there should be a strong selective pressure to restrict pre-hibernation fattening to a short-time period before the onset of hibernation. The edible dormouse (Glis glis) is characterized by having adapted its whole life history to the irregularly occurring mast-seeding pattern of the European beech (Fagus sylvaticus)...
January 3, 2018: Journal of Comparative Physiology. B, Biochemical, Systemic, and Environmental Physiology
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