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https://www.readbyqxmd.com/read/28810731/the-impact-of-hydrogen-bonding-on-the-dynamics-and-structure-of-protic-ionic-liquid-water-binary-mixtures
#1
Heather E Bailey, Yong-Lei Wang, Michael D Fayer
The orientational dynamics and microscopic liquid structure of a protic ionic liquid, 1-ethylimidazolium bis(trifluoromethylsulfonyl)imide (EhimNTf2), and its aprotic analogue, 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide (EmimNTf2), were studied at various water concentrations using optical heterodyne-detected optical Kerr Effect (OHD-OKE) spectroscopy, linear infrared spectroscopy, and atomistic simulations. The OHD-OKE experiments essentially measure the orientational relaxation of the Ehim+ and Emim+ cations...
August 15, 2017: Journal of Physical Chemistry. B
https://www.readbyqxmd.com/read/28809537/confined-water-structure-dynamics-and-thermodynamics
#2
Sudip Chakraborty, Hemant Kumar, Chandan Dasgupta, Prabal K Maiti
Understanding the properties of strongly confined water is important for a variety of applications such as fast flow and desalination devices, voltage generation, flow sensing, and nanofluidics. Confined water also plays an important role in many biological processes such as flow through ion channels. Water in the bulk exhibits many unusual properties that arise primarily from the presence of a network of hydrogen bonds. Strong confinement in structures such as carbon nanotubes (CNTs) substantially modifies the structural, thermodynamic, and dynamic (both translational and orientational) properties of water by changing the structure of the hydrogen bond network...
August 15, 2017: Accounts of Chemical Research
https://www.readbyqxmd.com/read/28806086/role-of-electrostatics-in-protein-rna-binding-the-global-vs-the-local-energy-landscape
#3
Zhaleh Ghaemi, Irisbel Guzman, David Gnutt, Zaida Luthey-Schulten, Martin Gruebele
U1A protein - stem loop 2 RNA association is a basic step in the assembly of the spliceosomal U1 small nuclear ribonucleoprotein. Long-range electrostatic interactions due to the positive charge of U1A are thought to provide high binding affinity for the negatively charged RNA. Short range interactions, such as hydrogen bonds and contacts between RNA bases and protein side chains, favor a specific binding site. Here, we propose that electrostatic interactions are as important as local contacts in biasing the protein-RNA energy landscape towards a specific binding site...
August 14, 2017: Journal of Physical Chemistry. B
https://www.readbyqxmd.com/read/28803215/structural-tribological-and-mechanical-properties-of-the-hind-leg-joint-of-a-jumping-insect-using-katydids-to-inform-bioinspired-lubrication-systems
#4
Jun Kyun Oh, Spencer T Behmer, Richelle Marquess, Cengiz Yegin, Ethan A Scholar, Mustafa Akbulut
This study investigates the structural properties of the hind leg femur-tibia joint in adult katydids (Orthoptera: Tettigoniidae), including its tribological and mechanical properties. It is of particular interest because the orthopteran (e.g., grasshoppers, crickets, and katydids) hind leg is highly specialized for jumping. We show that the katydid hind leg femur-tibia joint had unique surfaces and textures, with a friction coefficient (μ) at its coupling surface of 0.053 ± 0.001. Importantly, the sheared surfaces at this joint showed no sign of wear or damage, even though it had undergone thousands of external shearing cycles...
August 9, 2017: Acta Biomaterialia
https://www.readbyqxmd.com/read/28802644/rapid-characterization-of-the-cho-platform-cell-line-and-identification-of-pseudo-attp-sites-for-phic31-integrase
#5
Narges Damavandi, Mozhgan Raigani, Atefeh Joudaki, Fatemeh Davami, Sirous Zeinali
The Chinese Hamster Ovary (CHO) cell lines, applicable to post-translational modifications, are preferred systems for biopharmaceutical protein production. In this study, by using the Jump-In™ TI™ technology which employs PhiC31 and R4 bacteriophage recombinases, a platform CHO-K1 cell line containing a R4-attP site was generated. Here, a combination of Quantitative Fluorescent-Polymerase Chain Reaction (QF-PCR) and semi-random, two-step PCR (ST-PCR), was performed to feature the platform cell clones. Our results show that QF-PCR and ST-PCR, can be utilized for efficient and accelerated cell line characterization...
August 9, 2017: Protein Expression and Purification
https://www.readbyqxmd.com/read/28799030/transfer-of-improved-movement-technique-after-receiving-verbal-external-focus-and-video-instruction
#6
Anne Benjaminse, Wouter Welling, Bert Otten, Alli Gokeler
PURPOSE: It is unknown how movement patterns that are learned carry over to the field. The objective was to determine whether training during a jump-landing task would transfer to lower extremity kinematics and kinetics during sidestep cutting. METHODS: Forty healthy athletes were assigned to the verbal internal focus (IF, n = 10), verbal external focus (EF, n = 10), video (VI, n = 10) or control (CTRL, n = 10) group. A jump-landing task was performed as baseline followed by training blocks (TR1 and TR2) and a post-test...
August 10, 2017: Knee Surgery, Sports Traumatology, Arthroscopy: Official Journal of the ESSKA
https://www.readbyqxmd.com/read/28798475/molecular-identification-of-spiders-preying-on-empoasca-vitis-in-a-tea-plantation
#7
Ting-Bang Yang, Jie Liu, Long-Yu Yuan, Yang Zhang, Dai-Qin Li, Ingi Agnarsson, Jian Chen
Biological control using predators of key pest species is an attractive option in integrated pest management (IPM). Molecular gut analysis can provide an estimation of predator efficiency on a given prey. Here we use a combination of various experimental approaches, both in field and lab, to identify a potential biological control species of the common pest of commercially grown tea, Empoasca vitis (Göthe) (Hemiptera), in a Chinese plantation. We collected 2655 spiders from plantations and established relative abundances of spider species and their temporal overlap with the pest species in tea canopy...
August 10, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28791436/musculoskeletal-health-in-newly-diagnosed-children-with-crohn-s-disease
#8
L M Ward, J Ma, F Rauch, E I Benchimol, J Hay, M B Leonard, M A Matzinger, N Shenouda, B Lentle, H Cosgrove, M Scharke, V N Konji, D R Mack
We evaluated the impact of Crohn's disease on muscle and bone strength, mass, density, and geometry in children with newly diagnosed CD and found profound muscle and bone deficits; nevertheless, the prevalence of vertebral fractures at this time point was low. INTRODUCTION: Crohn's disease (CD) is an inflammatory condition of the gastrointestinal tract that can affect the musculoskeletal system. The objective of this study was to determine the prevalence of vertebral fractures and the impact of CD on muscle and bone mass, strength, density, and geometry in children with newly diagnosed CD...
August 8, 2017: Osteoporosis International
https://www.readbyqxmd.com/read/28789536/computational-simulations-of-solvation-force-and-squeezing-out-of-dodecane-chain-molecules-in-an-atomic-force-microscope
#9
Rong-Guang Xu, Yuan Xiang, Yongsheng Leng
Understanding the squeeze out behaviors of liquid films at nanometer scale in an atomic force microscope (AFM) has been a significant interest since the 1990s. We carry out all-atom static-mode AFM simulations in a liquid-vapor molecular dynamics ensemble to investigate the solvation force oscillation and squeeze out mechanisms of a confined linear dodecane fluid between a gold AFM tip and a mica substrate. Solvation force oscillations are found to be associated with the layering transition of the liquid film and unstable jumps of the AFM tip...
August 7, 2017: Journal of Chemical Physics
https://www.readbyqxmd.com/read/28783846/cardiorespiratory-responses-to-continuous-and-intermittent-exercises-in-children
#10
Georges Baquet, François-Xavier Gamelin, Julien Aucouturier, Serge Berthoin
The aim of the study was to characterize aerobic responses to high intensity intermittent (HIIE) and continuous (CE) exercises in prepubertal children. 26 children aged 8 to 11-year-old took part in a preliminary session to determine peakVO2 and Maximal Aerobic Velocity (MAV). In 5 subsequent experimental visits, the participants completed 2 CE and 3 HIIE sessions in a randomized order. HIIE consisted of short intermittent 10-s and 20-s running bouts at 100 to 130% MAV, interspersed with recovery periods of equal duration (S-HIIE1 and S-HIIE2 respectively) and 5-s of sprinting and jumping at maximal intensity with 15-s recovery periods (S-HIIE3)...
August 7, 2017: International Journal of Sports Medicine
https://www.readbyqxmd.com/read/28782061/ubiquitous-accessibility-for-people-with-visual-impairments-are-we-there-yet
#11
Syed Masum Billah, Vikas Ashok, Donald E Porter, I V Ramakrishnan
Ubiquitous access is an increasingly common vision of computing, wherein users can interact with any computing device or service from anywhere, at any time. In the era of personal computing, users with visual impairments required special-purpose, assistive technologies, such as screen readers, to interact with computers. This paper investigates whether technologies like screen readers have kept pace with, or have created a barrier to, the trend toward ubiquitous access, with a specific focus on desktop computing as this is still the primary way computers are used in education and employment...
May 2017: Proceedings of the SIGCHI Conference on Human Factors in Computing Systems
https://www.readbyqxmd.com/read/28780886/reliability-of-unipodal-and-bipodal-counter-movement-jump-landings-in-a-recreational-male-population
#12
Cédric Schwartz, Bénédicte Forthomme, Julien Paulus, Jean-François Kaux, Olivier Brüls, Vincent Denoël, Jean-Louis Croisier
Movement patterns during landing have been suggested to be related to injury risk. The purpose of this study was to determine the inter-session reliability of kinematic variables and ground reaction forces during landing in a population of male recreational athletes after a counter movement jump. Both unipodal and bipodal landings were evaluated. Furthermore, the possibility to improve landing reliability with a verbal instruction was also studied. Twenty-four male volunteers with no history of lower extremity trauma were randomly assigned to two groups (with and without verbal landing instruction)...
August 6, 2017: European Journal of Sport Science
https://www.readbyqxmd.com/read/28775069/the-effect-of-a-pre-hop-on-the-muscle-tendon-interaction-during-vertical-jumps
#13
Jeroen Aeles, Glen A Lichtwark, Dries Peeters, Christophe Delecluse, Ilse Jonkers, Benedicte Vanwanseele
Many movements use stretch-shortening cycles of a muscle-tendon unit (MTU) for storing and releasing elastic energy. The required stretching of medial gastrocnemius (MG) tendinous tissue during jumps, however, requires large length changes of the muscle fascicles, due to the lack of MTU length changes. This has a negative impact on the force generating capacity of the muscle fascicles. The purpose of this study was to induce a MG MTU stretch prior to shortening by adding a pre-hop to the squat jump. Eleven well-trained athletes specialized in jumping performed a pre-hop squat jump (PHSJ) and a standard squat jump (SSJ)...
August 3, 2017: Journal of Applied Physiology
https://www.readbyqxmd.com/read/28772918/switching-vo%C3%A2-single-crystals-and-related-phenomena-sliding-domains-and-crack-formation
#14
Bertina Fisher, Larisa Patlagan
VO₂ is the prototype material for insulator-metal transition (IMT). Its transition at TIMT = 340 K is fast and consists of a large resistance jump (up to approximately five orders of magnitude), a large change in its optical properties in the visible range, and symmetry change from monoclinic to tetragonal (expansion by 1% along the tetragonal c-axis and 0.5% contraction in the perpendicular direction). It is a candidate for potential applications such as smart windows, fast optoelectronic switches, and field-effect transistors...
May 19, 2017: Materials
https://www.readbyqxmd.com/read/28771514/sign-realized-jump-risk-and-the-cross-section-of-stock-returns-evidence-from-china-s-stock-market
#15
Youcong Chao, Xiaoqun Liu, Shijun Guo
Using 5-minute high frequency data from the Chinese stock market, we employ a non-parametric method to estimate Fama-French portfolio realized jumps and investigate whether the estimated positive, negative and sign realized jumps could forecast or explain the cross-sectional stock returns. The Fama-MacBeth regression results show that not only have the realized jump components and the continuous volatility been compensated with risk premium, but also that the negative jump risk, the positive jump risk and the sign jump risk, to some extent, could explain the return of the stock portfolios...
2017: PloS One
https://www.readbyqxmd.com/read/28768866/reverse-engineering-field-isolates-of-myxoma-virus-demonstrates-that-some-gene-disruptions-or-loss-of-function-do-not-explain-virulence-changes-observed-in-the-field
#16
June Liu, Isabella M Cattadori, Derek G Sim, John-Sebastian Eden, Edward C Holmes, Andrew F Read, Peter J Kerr
The coevolution of myxoma virus (MYXV) and wild European rabbits in Australia and Europe is a paradigm for the evolution of a pathogen in a new host species. Genomic analyses have identified the mutations that have characterized this evolutionary process, but defining causal mutations in the pathways from virulence to attenuation and back to virulence has not been possible. Using reverse genetics we examined the role of six selected mutations found in Australian field isolates of MYXV that fall in known or potential virulence genes...
August 2, 2017: Journal of Virology
https://www.readbyqxmd.com/read/28767250/insights-into-the-impact-of-surface-hydrophobicity-on-droplet-coalescence-and-jumping-dynamics
#17
Hongxia Li, Weilin Yang, Abulimiti Aili, TieJun Zhang
Droplet coalescence jumping on superhydrophobic surfaces attracts much research attention owing to its capability in enhancing condensation for energy and water applications. In this work, we reveal the impact of the finite surface adhesion to explain velocity discrepancies observed in recent droplet jumping studies, particularly when droplet sizes are a few micrometers (1-10 µm). Surface adhesion, which is usually neglected, can significantly affect both droplet coalescence and departure dynamics. It causes oscillations on velocity and contact area in the droplet coalescence process, as observed numerically and experimentally...
August 2, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28767248/spreading-dynamics-of-molten-polymer-drops-on-glass-substrates
#18
Yichuan Zhang, Carlos A Fuentes, Robin Koekoekx, Christian Clasen, Aart Willem van Vuure, Joel De Coninck, David Seveno
Wetting dynamics drive numerous processes involving liquids in contact with solid substrates with a wide range of geometries. The spreading dynamics of organic liquids and liquid metals at, respectively, room temperature and above 1000 °C have been studied extensively, both experimentally and numerically. However, almost no attention has been paid to the wetting behavior of molten drops of thermoplastic polymers, despite its importance, for example, in the processing of fiber-reinforced polymer composites...
August 2, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28766630/the-dynamics-of-benzene-on-cu-111-a-combined-helium-spin-echo-and-dispersion-corrected-dft-study-into-the-diffusion-of-physisorbed-aromatics-on-metal-surfaces
#19
M Sacchi, P Singh, D M Chisnall, D J Ward, A P Jardine, W Allison, J Ellis, H Hedgeland
We use helium spin-echo spectroscopy (HeSE) to investigate the dynamics of the diffusion of benzene adsorbed on Cu(111). The results of these measurements show that benzene moves on the surface through an activated jump-diffusion process between the adsorption sites on a Bravais lattice. Density Functional Theory (DFT) calculations with van der Waals (vdW) corrections help us understand that the molecule diffuses by jumping through non-degenerate hollow sites. The results of the calculations shed light on the nature of the binding interaction between this prototypical aromatic molecule and the metallic surface...
August 2, 2017: Faraday Discussions
https://www.readbyqxmd.com/read/28766333/monitoring-hydrogen-exchange-during-protein-folding-by-fast-pressure-jump-nmr-spectroscopy
#20
T Reid Alderson, Cyril Charlier, Dennis A Torchia, Philip Anfinrud, Ad Bax
A method is introduced that permits direct observation of the rates at which backbone amide hydrogens become protected from solvent exchange after rapidly dropping the hydrostatic pressure inside the NMR sample cell from denaturing (2.5 kbar) to native (1 bar) conditions. The method is demonstrated for a pressure-sensitized ubiquitin variant that contains two Val to Ala mutations. Increased protection against hydrogen exchange with solvent is monitored as a function of time during the folding process. Results for 53 backbone amides show narrow clustering with protection occurring with a time constant of ca...
August 16, 2017: Journal of the American Chemical Society
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