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https://www.readbyqxmd.com/read/28228037/water-dissociation-on-ni-100-ni-110-and-ni-111-surfaces-reaction-path-approach-to-mode-selectivity
#1
H Seenivasan, Bret Jackson, Ashwani K Tiwari
A comparative study of mode-selectivity of water dissociation on Ni(100), Ni(110), and Ni(111) surfaces is performed at the same level of theory using a fully quantum approach based on the reaction path Hamiltonian. Calculations show that the barrier to water dissociation on the Ni(110) surface is significantly lower compared to its close-packed counterparts. Transition states for this reaction on all three surfaces involve the elongation of one of the O-H bonds. A significant decrease in the symmetric stretching and bending mode frequencies near the transition state is observed in all three cases and in the vibrational adiabatic approximation, excitation of these softened modes results in a significant enhancement in reactivity...
February 21, 2017: Journal of Chemical Physics
https://www.readbyqxmd.com/read/28228028/characterization-of-the-electronic-states-of-the-biological-relevant-ssno-molecule
#2
Tarek Ayari, Majdi Hochlaf, Muneerah Mogren Al-Mogren, Joseph S Francisco
Using configuration interaction ab initio methods, we investigate the lowest electronic states of doublet and quartet spin multiplicities of SSNO where the one-dimensional cuts of the six-dimensional potential energy surfaces of these electronic states along the stretching and bending coordinates are computed. Mainly, these electronic states are found to be repulsive along the central SN distance. A high density of electronic states is computed even at low excitation energies that may favor their couplings...
February 21, 2017: Journal of Chemical Physics
https://www.readbyqxmd.com/read/28226938/a-wearable-skin-stretch-haptic-feedback-device-towards-improving-balance-control-in-lower-limb-amputees
#3
M A B Husman, H F Maqbool, M I Awad, A Abouhossein, A A Dehghani-Sanij, M A B Husman, H F Maqbool, M I Awad, A Abouhossein, A A Dehghani-Sanij, A Abouhossein, A A Dehghani-Sanij, M A B Husman, M I Awad, H F Maqbool
Haptic feedback to lower limb amputees is essential to maximize the functionality of a prosthetic device by providing information to the user about the interaction with the environment and the position of the prostheses in space. Severed sensory pathway and the absence of connection between the prosthesis and the Central Nervous System (CNS) after lower limb amputation reduces balance control, increases visual dependency and increases risk of falls among amputees. This work describes the design of a wearable haptic feedback device for lower limb amputees using lateral skin-stretch modality intended to serve as a feedback cue during ambulation...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28217418/maximum-repetition-performance-after-different-antagonist-foam-rolling-volumes-in-the-inter-set-rest-period
#4
Estêvão Rios Monteiro, Jakob Škarabot, Andrew D Vigotsky, Amanda Fernandes Brown, Thiago Matassoli Gomes, Jefferson da Silva Novaes
BACKGROUND: Foam rollers, or other similar devices, are a method for acutely increasing range of motion, but in contrast to static stretching, do not appear to have detrimental effects on neuromuscular performance. PURPOSE: The purpose of this study was to investigate the effects of different volumes (60 and 120 seconds) of foam rolling of the hamstrings during the inter-set rest period on repetition performance of the knee extension exercise. METHODS: Twenty-five recreationally active females were recruited for the study (27...
February 2017: International Journal of Sports Physical Therapy
https://www.readbyqxmd.com/read/28184390/gold-nanoparticle-interactions-with-endothelial-cells-cultured-under-physiological-conditions
#5
C Freese, L Anspach, R C Deller, S-J Richards, M I Gibson, C J Kirkpatrick, R E Unger
PEGylated gold nanoparticles (AuNPs) have an extended circulation time after intravenous injection in vivo and exhibit favorable properties for biosensing, diagnostic imaging, and cancer treatment. No impact of PEGylated AuNPs on the barrier forming properties of endothelial cells (ECs) has been reported, but recent studies demonstrated that unexpected effects on erythrocytes are observed. Almost all studies to date have been with static-cultured ECs. Herein, ECs maintained under physiological cyclic stretch and flow conditions and used to generate a blood-brain barrier model were exposed to 20 nm PEGylated AuNPs...
February 10, 2017: Biomaterials Science
https://www.readbyqxmd.com/read/28182516/the-effectiveness-of-pnf-vs-static-stretching-on-increasing-hip-flexion-range-of-motion
#6
Landon Lempke, Rebecca Green, Caitlin Murray, Justin Stanek
No abstract text is available yet for this article.
February 9, 2017: Journal of Sport Rehabilitation
https://www.readbyqxmd.com/read/28179885/plyometric-training-favors-optimizing-muscle-tendon-behavior-during-depth-jumping
#7
Kuniaki Hirayama, Soichiro Iwanuma, Naoki Ikeda, Ayumi Yoshikawa, Ryoichi Ema, Yasuo Kawakami
The purpose of the present study was to elucidate how plyometric training improves stretch-shortening cycle (SSC) exercise performance in terms of muscle strength, tendon stiffness, and muscle-tendon behavior during SSC exercise. Eleven men were assigned to a training group and ten to a control group. Subjects in the training group performed depth jumps (DJ) using only the ankle joint for 12 weeks. Before and after the period, we observed reaction forces at foot, muscle-tendon behavior of the gastrocnemius, and electromyographic activities of the triceps surae and tibialis anterior during DJ...
2017: Frontiers in Physiology
https://www.readbyqxmd.com/read/28167188/the-effect-of-kinesio-taping-versus-stretching-techniques-on-muscle-soreness-and-flexibility-during-recovery-from-nordic-hamstring-exercise
#8
Tarik Ozmen, Gokce Yagmur Gunes, Hanife Dogan, Ilyas Ucar, Mark Willems
The purpose of this study was to examine the effects of static stretching, proprioceptive neuromuscular facilitation (PNF) stretching, or kinesio taping (KT) on muscle soreness and flexibility during recovery from exercise. Sixty-five females were randomly assigned to four groups: PNF stretching (n = 15), static stretching (n = 16), KT (n = 17), and control (n = 17). All participants performed nordic hamstring exercise (5 sets of 8 repetitions). In all groups, hamstring flexibility at 24 h and 48 h was not changed from baseline (p > ...
January 2017: Journal of Bodywork and Movement Therapies
https://www.readbyqxmd.com/read/28162971/comparison-of-friction-forces-between-stainless-orthodontic-steel-brackets-and-tini-wires-in-wet-and-dry-conditions
#9
Aphinan Phukaoluan, Anak Khantachawana, Pongpan Kaewtatip, Surachai Dechkunakorn, Niwat Anuwongnukroh, Peerapong Santiwong, Julathep Kajornchaiyakul
In sliding mechanics, frictional force is an important counter-balancing element to orthodontic tooth movement, which must be controlled in order to allow application of light continuous forces. The purpose of this study was to compare the frictional forces between a stainless steel bracket and five different wire alloys under dry and wet (artificial saliva) conditions. TiNi, TiNiCu, TiNiCo, commercial wires A and commercial wires B with equal dimensions of 0.016×0.022'' were tested in this experiment. The stainless steel bracket was chosen with a slot dimension of 0...
February 2, 2017: International Orthodontics
https://www.readbyqxmd.com/read/28161870/acute-effect-of-static-stretching-on-passive-stiffness-of-the-human-gastrocnemius-fascicle-measured-by-ultrasound-shear-wave-elastography
#10
Kosuke Hirata, Hiroaki Kanehisa, Naokazu Miyamoto
PURPOSE: Passive muscle stiffness and muscle architecture at a given joint angle, as well as slack angle of the muscle have been shown to change after an acute bout of stretching. However, it remains unclear whether passive muscle stiffness at a given fascicle length is reduced after stretching. We aimed to elucidate the acute effect of static stretching on the passive fascicle stiffness using ultrasound shear wave elastography. METHODS: Shear modulus, fascicle length, and slack angle of the medial gastrocnemius (MG) as well as passive plantar flexion torque during passive dorsiflexion were measured before and after a 5-min static stretching in 14 healthy males...
February 4, 2017: European Journal of Applied Physiology
https://www.readbyqxmd.com/read/28155694/%C3%AE-1-integrin-signaling-in-asymmetric-migration-of-keratinocytes-under-mechanical-stretch-in-a-co-cultured-wound-repair-model
#11
Dongyuan Lü, Zhan Li, Yuxin Gao, Chunhua Luo, Fan Zhang, Lu Zheng, Jiawen Wang, Shujin Sun, Mian Long
BACKGROUND: Keratinocyte (KC) migration in re-epithelization is crucial in repairing injured skin. But the mechanisms of how mechanical stimuli regulate the migration of keratinocytes have been poorly understood. METHODS: Human immortalized keratinocyte HaCaT cells were co-cultured with skin fibroblasts on PDMS membranes and transferred to the static stretch device developed in-house for additional 6 day culture under mechanical stretch to mimic surface tension in skin...
December 28, 2016: Biomedical Engineering Online
https://www.readbyqxmd.com/read/28149355/acute-effect-of-different-combined-stretching-methods-on-acceleration-and-speed-in-soccer-players
#12
Mohammadtaghi Amiri-Khorasani, Julio Calleja-Gonzalez, Mansooreh Mogharabi-Manzari
The purpose of this study was to investigate the acute effect of different stretching methods, during a warm-up, on the acceleration and speed of soccer players. The acceleration performance of 20 collegiate soccer players (body height: 177.25 ± 5.31 cm; body mass: 65.10 ± 5.62 kg; age: 16.85 ± 0.87 years; BMI: 20.70 ± 5.54; experience: 8.46 ± 1.49 years) was evaluated after different warm-up procedures, using 10 and 20 m tests. Subjects performed five types of a warm-up: static, dynamic, combined static + dynamic, combined dynamic + static, and no-stretching...
April 1, 2016: Journal of Human Kinetics
https://www.readbyqxmd.com/read/28149064/effect-of-a-12-week-yoga-therapy-program-on-mental-health-status-in-elderly-women-inmates-of-a-hospice
#13
Meena Ramanathan, Ananda Balayogi Bhavanani, Madanmohan Trakroo
AIM AND OBJECTIVES: This study was undertaken to evaluate the effectiveness of yoga on the mental health status of elderly women inmates residing in a hospice in Puducherry. MATERIALS AND METHODS: Forty elderly women were randomly divided into yoga and wait-listed control group. A yoga therapy program of 60 min was given twice a week for 12 weeks. This protocol was specially designed for senior citizens, keeping in mind their health status and physical limitations that included simple warm-up and breath-body movement coordination practices (jathis and kriyas), static stretching postures (asanas), breathing techniques (pranayamas), and relaxation...
January 2017: International Journal of Yoga
https://www.readbyqxmd.com/read/28129596/tissue-engineering-the-mechanosensory-circuit-of-the-stretch-reflex-arc-with-human-stem-cells-sensory-neuron-innervation-of-intrafusal-muscle-fibers
#14
Xiufang Guo, Alisha Colon, Nesar Akanda, Severo Spradling, Maria Stancescu, Candace Martin, James J Hickman
Muscle spindles are sensory organs embedded in the belly of skeletal muscles that serve as mechanoreceptors detecting static and dynamic information about muscle length and stretch. Through their connection with proprioceptive sensory neurons, sensation of axial body position and muscle movement are transmitted to the central nervous system. Impairment of this sensory circuit causes motor deficits and has been linked to a wide range of diseases. To date, no defined human-based in vitro model of the proprioceptive sensory circuit has been developed...
April 2017: Biomaterials
https://www.readbyqxmd.com/read/28126731/prestretched-airway-smooth-muscle-response-to-length-oscillation
#15
Ahmed M Al-Jumaily, Kevin Roos, Sandy Bessaguet, Miguel Jo Avila
Airway smooth muscle (ASM) hyperconstriction is the cause of many respiratory diseases including asthma. In vitro testing has demonstrated that the active forces of ASM are reduced by length oscillation (LO) mimicking tidal breathing. In a previous study, we demonstrated that this force reduction can be further enhanced when superimposing oscillations (with certain frequencies and amplitudes) on this LO In contrast, it has been reported that pressurizing the lung may help in relieving asthmatic airway constrictions...
January 2017: Physiological Reports
https://www.readbyqxmd.com/read/28124872/the-change-in-muscle-hardness-after-static-stretching-evaluated-by-different-ultrasound-elastography-techniques-may-be-equivalent
#16
Takayuki Inami, Takuya Shimizu
No abstract text is available yet for this article.
January 2017: Journal of Sports Medicine and Physical Fitness
https://www.readbyqxmd.com/read/28123009/distribution-of-ttx-sensitive-voltage-gated-sodium-channels-in-primary-sensory-endings-of-mammalian-muscle-spindles
#17
Dario Ivan Carrasco, Jacob A Vincent, Timothy C Cope
Knowledge of the molecular mechanisms underlying signaling of mechanical stimuli by muscle spindles remains incomplete. In particular, the ionic conductances that sustain tonic firing during static muscle stretch are unknown. We hypothesized that tonic firing by spindle afferents depends on sodium persistent inward current (INaP), and we tested for the necessary presence of the appropriate voltage-gated sodium (NaV) channels in primary sensory endings. We began study of the NaV1.6 isoform, selected both for its capacity to produce INaP and for its presence in other mechanosensors that fire tonically...
January 25, 2017: Journal of Neurophysiology
https://www.readbyqxmd.com/read/28121177/effects-of-elastic-taping-non-elastic-taping-and-static-stretching-on-recovery-after-intensive-eccentric-exercise
#18
Disaphon Boobphachart, Nuttaset Manimmanakorn, Apiwan Manimmanakorn, Worrawut Thuwakum, Michael J Hamlin
The purpose of this study was to compare the effect of elastic tape (Kinesio tape) to placebo tape or static stretching on delayed onset muscle soreness. Fifty-one untrained female healthy volunteers were randomly assigned into three groups (n = 17/group), elastic tape, placebo tape and stretching group. Muscle soreness was induced by 4 sets of 25 maximal isokinetic (60°.s(-1)) eccentric contractions of dominant quadriceps on an isokinetic dynamometer. Compared with placebo tape, the elastic tape participants had less muscle soreness at 72 h post-exercise (p = 0...
January 25, 2017: Research in Sports Medicine
https://www.readbyqxmd.com/read/28118311/acute-effects-of-static-stretching-of-hamstring-on-performance-and-acl-injury-risk-during-stop-jump-and-cutting-tasks-in-female-athletes
#19
Mianfang Ruan, Qiang Zhang, Xie Wu
There is limited research investigating antagonist stretch. The purpose of this study was to evaluate the influence of SSH on performance and ACL injury risk during stop-jump and 180° cutting tasks. Twelve female college athletes (age 20.8 ± 0.7 years; height 1.61 ± 0.05 m; mass 54.25 ± 4.22 kg) participated in this study. Subjects performed stop-jump and 180° cutting tasks under two conditions: after warm-up with 4×30 s SSH or after warm-up without SSH. Three-dimensional kinematic and kinetic data as well as EMG of biceps femoris (BF), rectus femoris (RF), vastus medialis (VM), and gastrocnemius medialis (GM) were collected during testing...
January 11, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28118306/acute-effects-of-stretching-on-leg-and-vertical-stiffness-during-treadmill-running
#20
Panagiotis Pappas, Giorgos P Paradisis, Timothy A Exell, Athanasia Smirniotou, Charilaos Tsolakis, Adamantios Arampatzis
The implementation of static (SS) and dynamic (DS) stretching during warm-up routines produces significant changes in biological and functional properties of the human musculoskeletal system. These properties could affect the leg and vertical stiffness characteristics that are considered important factors for the success of athletic activities. The aim of this study was to investigate the influence of SS and DS on selected kinematic variables, and leg and vertical stiffness during treadmill running. Fourteen males (age: 22...
January 11, 2017: Journal of Strength and Conditioning Research
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