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https://www.readbyqxmd.com/read/28742966/the-decisive-role-of-hydrophobicity-on-the-effect-of-alkylammonium-chlorides-on-protein-stability-a-terahertz-spectroscopic-finding
#1
Debasish Das Mahanta, Rajib Kumar Mitra, Nirnay Samanta
Many biologically important processes involve a subtle interplay between Columbic and hydrophobic interactions among molecular groups with water. A comprehensive understanding of such processes, specially while occurring simultaneously in the same molecule is of practical importance. In this contribution we report the ultrafast (sub-ps to ps) collective hydrogen bond dynamics of water in the extended hydration layers in a series of alkylammonium chloride salts using THz time domain spectroscopic (TTDS) technique (0...
July 25, 2017: Journal of Physical Chemistry. B
https://www.readbyqxmd.com/read/28742961/solid-solid-phase-transitions-and-t-butyl-and-methyl-group-rotation-in-an-organic-solid-x-ray-diffractometry-differential-scanning-calorimetry-and-solid-state-1h-nuclear-spin-relaxation
#2
Peter A Beckmann, Andrew R McGhie, Arnold L Rheingold, Gilbert J Sloan, Steven T Szewczyk
Using solid state 1H nuclear magnetic resonance (NMR) spin-lattice relaxation experiments, we have investigated the effects of several solid-solid phase transitions on t-butyl group and methyl group rotation in solid 1,3,5-tri-t-butylbenzene. The goal is to relate the dynamics of the t-butyl groups and their constituent methyl groups to properties of the solid determined using single-crystal X-ray diffraction and differential scanning calorimetry (DSC). On cooling, the DSC experiments see a first-order, solid-solid phase transition at either 268 K or 155 K (but not both) depending on thermal history...
July 25, 2017: Journal of Physical Chemistry. A
https://www.readbyqxmd.com/read/28742824/how-do-rehomed-laboratory-beagles-behave-in-everyday-situations-results-from-an-observational-test-and-a-survey-of-new-owners
#3
Dorothea Döring, Ophelia Nick, Alexander Bauer, Helmut Küchenhoff, Michael H Erhard
When laboratory dogs are rehomed into private households, they experience an extreme change in their life situation. They leave their familiar, limited environment in the research facility and encounter a multitude of animate and inanimate stimuli in their new home. Although literature reports have described the experiences with rehoming as being mostly positive, scientific observations of the dogs in everyday situations have not been done. Hence, we conducted an observational test with 74 laboratory beagles 6 weeks after adoption in their new homes...
2017: PloS One
https://www.readbyqxmd.com/read/28742609/the-efficacy-of-dynamic-contract-relax-stretching-on-delayed-onset-muscle-soreness-among-healthy-individuals-a-randomized-clinical-trial
#4
Yanfei Xie, Beibei Feng, Kedi Chen, Lars L Andersen, Phil Page, Yuling Wang
OBJECTIVE: To evaluate the efficacy of dynamic contract-relax stretching on delayed-onset muscle soreness (DOMS) in the calf muscle of healthy individuals. DESIGN: Randomized clinical trial. SETTING: Research laboratory. PARTICIPANTS: Three groups of 16 healthy participants (n = 48) were recruited by convenience sampling. INTERVENTIONS: Three sets of resisted bilateral heel-raising exercises until exhaustion were conducted to initiate DOMS...
July 21, 2017: Clinical Journal of Sport Medicine: Official Journal of the Canadian Academy of Sport Medicine
https://www.readbyqxmd.com/read/28742423/chemical-immobilization-of-free-ranging-yellow-armadillos-euphractus-sexcinctus-for-implantation-of-intra-abdominal-transmitters
#5
Vinicius Peron de Oliveira Gasparotto, Nina Attias, Flávia Regina Miranda, Grazielle Cristina Garcia Soresini, Ariel da Costa Canena, Guilherme Mourão
Free-ranging yellow armadillos (Euphractus sexcinctus) from the Brazilian Pantanal were captured for surgical implantation of intra-abdominal radio transmitters. During March 2014, 11 animals were chemically immobilized with a combination of intramuscular ketamine hydrochloride, xylazine hydrochloride, midazolam maleate, and atropine sulfate. The mean induction time and initial heart rate in males was higher than in females. The sex of armadillos did not affect the respiratory rate, which increased from the beginning to end of the monitoring time...
July 25, 2017: Journal of Wildlife Diseases
https://www.readbyqxmd.com/read/28742323/response-characteristics-of-hydrogen-sensors-based-on-pmma-membrane-coated-palladium-nanoparticle-films
#6
Minrui Chen, Peng Mao, Yuyuan Qin, Jue Wang, Bo Xie, Xiuzhang Wang, Deyan Han, Guo-Hong Wang, Fengqi Song, Min Han, Jun-Ming Liu, Guanghou Wang
Coating polymeric membrane for gas separation is a feasible approach to fabricate gas sensors with selectivity. In this study, poly(methyl methacrylate) (PMMA) membrane-coated palladium (Pd) nanoparticle (NP) films were fabricated for high-performance hydrogen (H2) gas sensing by carrying out gas phase cluster deposition and PMMA spin coating. No changes were induced by the PMMA spin coating in the electrical transport and H2 sensing mechanisms of the Pd NP films. Measurements of H2 sensing demonstrated that the devices were capable of detecting H2 gas within the concentration range of 0-10% at room temperature and showed high selectivity to H2 due to the filtration effect of the PMMA membrane layer...
July 25, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28742132/theory-and-development-of-biplanar-active-shim-coils-for-a-permanent-nmr-analyzer
#7
Tian Xia, Zhiying Miao, Shanshan Chen, Hongzhi Wang, Yefeng Yao
The general expression for magnetic induction in the z axis direction is derived from magnetic scalar potential, and magnetic induction for biplanar shimming coils (BSCs) is also derived from magnetic vector potentials and Green functions, which simultaneously include Sin and Cos harmonic fields. The relationship between these expressions is discussed, and we show they are partially consistent. Magnetic induction generated Sin and Cos stream functions, which are presented and discussed, and we conclude that the type of stream function determines the type of harmonic field, and that BSCs can not only generate specific harmonic fields directly using Cos stream function, but also generate the rest of the harmonic fields through some specific operations...
2017: PloS One
https://www.readbyqxmd.com/read/28742050/asymptotic-tracking-controller-design-for-nonlinear-systems-with-guaranteed-performance
#8
Bo Fan, Qinmin Yang, Sarangapani Jagannathan, Youxian Sun
In this paper, a novel adaptive control strategy is presented for the tracking control of a class of multi-input-multioutput uncertain nonlinear systems with external disturbances to place user-defined time-varying constraints on the system state. Our contribution includes a step forward beyond the usual stabilization result to show that the states of the plant converge asymptotically, as well as remain within user-defined time-varying bounds. To achieve the new results, an error transformation technique is first established to generate an equivalent nonlinear system from the original one, whose asymptotic stability guarantees both the satisfaction of the time-varying restrictions and the asymptotic tracking performance of the original system...
July 21, 2017: IEEE Transactions on Cybernetics
https://www.readbyqxmd.com/read/28742030/maximum-persistency-via-iterative-relaxed-inference-with-graphical-models
#9
Alexander Shekhovtsov, Paul Swoboda, Bogdan Savchynskyy
We consider the NP-hard problem of MAP-inference for undirected discrete graphical models. We propose a polynomial time and practically efficient algorithm for finding a part of its optimal solution. Specifically, our algorithm marks some labels of the considered graphical model either as (i) optimal, meaning that they belong to all optimal solutions of the inference problem; (ii) non-optimal if they provably do not belong to any solution. With access to an exact solver of a linear programming relaxation to the MAP-inference problem, our algorithm marks the maximal possible (in a specified sense) number of labels...
July 24, 2017: IEEE Transactions on Pattern Analysis and Machine Intelligence
https://www.readbyqxmd.com/read/28741599/dynamics-and-heat-diffusion-of-abrikosov-s-vortex-antivortex-pairs-during-an-annihilation-process
#10
Elwis Carlos Sartorelli Duarte, Rafael Zadorosny, W A Ortiz, Edson Sardella
The manipulation and control of vortex states in superconducting systems are of great interest in view of possible applications, for which mesoscopic materials are good candidates. In this work, we studied the annihilation dynamics and the dissipative aspects of an Abrikosov's vortex-antivortex pair in a mesoscopic superconducting system with a concentric hole. The time-dependent Ginzburg-Landau equations were numerically solved. The main result is the appearance of a phase slip-like line due to the elongation of the vortex and antivortex cores...
July 25, 2017: Journal of Physics. Condensed Matter: An Institute of Physics Journal
https://www.readbyqxmd.com/read/28741295/early-segmental-relaxation-abnormalities-in-hypertrophic-cardiomyopathy-for-differential-diagnostic-of-patients-with-left-ventricular-hypertrophy
#11
Christian Voigt, Julia Münch, Maxim Avanesov, Anna Suling, Katrin Witzel, Gunnar Lund, Monica Patten
BACKGROUND: Hypertrophic cardiomyopathy (HCM) is characterized by asymmetric left ventricular hypertrophy (LVH). However, clinical signs can be subtle and differentiation from other causes of LVH is challenging. HYPOTHESIS: As diastolic dysfunction (DD) is an early sign in HCM, we aimed to find regional changes in relaxation pattern for differentiation from other entities of LVH. METHODS: In 148 patients (81 HCM, 55 arterial hypertension (AHT), 12 Fabry disease) and 63 healthy controls, relaxation patterns were assessed using regional tissue Doppler imaging...
July 24, 2017: Clinical Cardiology
https://www.readbyqxmd.com/read/28741075/brain-relaxometry-after-macrocyclic-gd-based-contrast-agent
#12
Andreas Müller, Alina Jurcoane, Burkhard Mädler, Philip Ditter, Hans Schild, Elke Hattingen
PURPOSE: To assess if ratios of T1-weighted (T1w) signal intensity (SI) and quantitative T1 relaxometry (qT1) change on serial administration of macrocyclic gadobutrol. METHODS: A total of 17 glioblastoma patients were scanned at 3.0 T magnetic resonance imaging (MRI) every 6 weeks after tumor resection with standard MRI and T1 and T2 relaxometry before and after gadobutrol administration. On co-registered images T1w SI was measured and relaxation times T1 (qT1) and quantitative T2 (qT2) were quantified in several deep grey matter nuclei as ratios relative to frontal white matter and to the pons...
July 24, 2017: Clinical Neuroradiology
https://www.readbyqxmd.com/read/28741055/effects-of-tunable-excitation-in-carotenoids-explained-by-the-vibrational-energy-relaxation-approach
#13
Vytautas Balevičius, Craig N Lincoln, Daniele Viola, Giulio Cerullo, Jürgen Hauer, Darius Abramavicius
Carotenoids are fundamental building blocks of natural light harvesters with convoluted and ultrafast energy deactivation networks. In order to disentangle such complex relaxation dynamics, several studies focused on transient absorption measurements and their dependence on the pump wavelength. However, such findings are inconclusive and sometimes contradictory. In this study, we compare internal conversion dynamics in [Formula: see text]-carotene, pumped at the first, second, and third vibronic progression peak...
July 24, 2017: Photosynthesis Research
https://www.readbyqxmd.com/read/28739730/comparison-of-different-muscle-relaxant-anesthetics-on-growth-migration-and-invasion-of-gastric-cancer-cells
#14
Aihua Jiang, Huishan Zhao, Xiaofei Liu, Mingwei Yu, Jian Chen, Wen G Jiang
BACKGROUND/AIM: Muscle relaxants, also known as neuromuscular blocking agents, can block nerve impulses to the muscles and are always used in surgery for general anesthesia. However, the effect of muscle-relaxant anesthetics on cell activity in gastric cancer is currently unknown. The present study aimed to examine and compare the role of three different muscle-relaxant anesthetics in gastric cancer cells. MATERIALS AND METHODS: Gastric cancer cells (SGC7901 and BGC 823) were treated with a different dose of muscle-relaxant anesthetics, Rocuronium bromide (Rb), Vecuronium bromide (Vb) and Cisatracurium Besilate (CB)...
August 2017: Anticancer Research
https://www.readbyqxmd.com/read/28739079/individual-confidence-weighting-and-group-decision-making
#15
REVIEW
James A R Marshall, Gavin Brown, Andrew N Radford
Group-living species frequently pool individual information so as to reach consensus decisions such as when and where to move, or whether a predator is present. Such opinion-pooling has been demonstrated empirically, and theoretical models have been proposed to explain why group decisions are more reliable than individual decisions. Behavioural ecology theory frequently assumes that all individuals have equal decision-making abilities, but decision theory relaxes this assumption and has been tested in human groups...
July 21, 2017: Trends in Ecology & Evolution
https://www.readbyqxmd.com/read/28738269/an-anti-inflammatory-effect-of-red-microalga-polysaccharides-in-coronary-artery-endothelial-cells
#16
Oshrat Levy-Ontman, Mahmoud Huleihel, Rachel Hamias, Talya Wolak, Esther Paran
BACKGROUND AND AIMS: Polysaccharides (PSs) produced by the red microalga Porphyridium sp. were reported to exhibit anti-inflammatory bioactivities in the human skin. The primary goal of the present research was to assess whether PSs attenuate inflammatory processes by interfering with tumour necrosis factor-alpha (TNF-α)-induced inflammation, in human coronary artery endothelial cells (HCAECs). METHODS: Functional and inflammatory markers were quantified in TNF-α-stimulated HCAECs, with and without pre-treatment with PSs...
July 16, 2017: Atherosclerosis
https://www.readbyqxmd.com/read/28738106/predictors-of-clinically-significant-outcome-for-adolescents-with-temporomandibular-disorders
#17
Kerstin Wahlund, Bo Larsson
AIMS: To evaluate and identify baseline characteristics of the adolescent patients included in two previous randomized controlled trials (RCTs) that may predict a clinically significant outcome after treatment of temporomandibular disorders (TMD) with an occlusal appliance (OA) or relaxation training (RT) in a clinical sample of adolescents. METHODS: This study combined two patient samples from the earlier RCTs for a total of 167 adolescents with frequent TMD pain (once a week or more often), diagnosed according to the Research Diagnostic Criteria for TMD...
July 2017: Journal of Oral & Facial Pain and Headache
https://www.readbyqxmd.com/read/28737954/an-app-a-day-keeps-the-doctor-away-guided-education-and-training-via-smartphones-in-subthreshold-post-traumatic-stress-disorder
#18
Michael J Roy, Michelle E Costanzo, Krista B Highland, Cara Olsen, Denece Clayborne, Wendy Law
Post traumatic stress disorder (PTSD) symptoms are common in military service members (SMs), but stigma can impede treatment initiation. Smartphone applications (apps) are available anywhere, anytime, with the potential to both mitigate the impact of stigma and reduce PTSD symptom severity. We provided 144 SMs or family members, with subthreshold PTSD symptoms (PTSD Checklist [PCL] scores of 28-49), with apps promoting psychoeducation, social engagement, and relaxation and randomized them to 6 weeks of resilience enhancement (brief cognitive-behavioral session, followed by daily text messages directing app use) or a control group (daily text messages of inspirational quotes)...
July 24, 2017: Cyberpsychology, Behavior and Social Networking
https://www.readbyqxmd.com/read/28737942/the-role-of-rydberg-valence-coupling-in-the-ultrafast-relaxation-dynamics-of-acetone
#19
Markus Koch, Bernhard Thaler, Pascal Heim, Wolfgang E Ernst
The electronic structure of excited states of acetone is represented by a Rydberg manifold that is coupled to valence states which provide very fast and efficient relaxation pathways. We observe and characterize the transfer of population from photoexcited Rydberg states (6p, 6d, 7s) to a whole series of lower Rydberg states (3p to 4d) and a simultaneous decay of population from these states. We obtain these results with time-resolved photoelectron-photoion coincidence (PEPICO) detection in combination with the application of Bayesian statistics for data analysis...
July 24, 2017: Journal of Physical Chemistry. A
https://www.readbyqxmd.com/read/28737940/defining-the-structural-basis-for-allosteric-product-release-from-e-coli-dihydrofolate-reductase-using-nmr-relaxation-dispersion
#20
David Oyen, R Bryn Fenwick, Phillip C Aoto, Robyn L Stanfield, Ian A Wilson, H Jane Dyson, Peter E Wright
The rate-determining step in the catalytic cycle of E.coli dihydrofolate reductase is tetrahydrofolate (THF) product release, which can occur via an allosteric or an intrinsic pathway. The allosteric pathway, which becomes accessible when the reduced cofactor NADPH is bound, involves transient sampling of a higher energy conformational state, greatly increasing the product dissociation rate compared to the intrinsic pathway that obtains when NADPH is absent. Although the kinetics of this process are known, the enzyme structure and the THF product conformation in the transiently formed excited state remains elusive...
July 24, 2017: Journal of the American Chemical Society
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