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Steven R Niedermeier, Nisha Crouser, Amy Speeckaert, Kanu S Goyal
BACKGROUND: The aim of the study is to investigate current management strategies for lateral epicondylitis by fellowship-trained upper extremity surgeons. METHODS: A 17-question survey of treatment approaches and outcomes related to lateral epicondylitis was sent to 3354 surgeons using the American Society for Surgery of the Hand and American Shoulder and Elbow Surgeons member databases. RESULTS: Six hundred twelve upper extremity surgeons completed the survey...
April 1, 2018: Hand: Official Journal of the American Association for Hand Surgery
Francesco Silvio Gentile, Simone Salustro, Jacques Kontak Desmarais, Anna Maria Ferrari, Philippe D'Arco, Roberto Dovesi
The electronic and vibrational features of the VHn (n = 1 to 4) family of defects in diamond (hydrogen atoms saturating the dangling bonds of the atoms surrounding a vacancy) are investigated at the quantum mechanical level by using the periodic supercell approach, an all electron Gaussian type basis set, hybrid functionals, and the Crystal code. Most of the results have been collected for supercells containing 64 atoms; however, in order to explore the effect of the defect concentration on both the IR and Raman spectra, supercells containing 216, 512 and 1000 atoms have also been considered in the VH4 case...
April 18, 2018: Physical Chemistry Chemical Physics: PCCP
Naoki Mugii, Takashi Matsushita, Sachie Oohata, Hirokazu Okita, Tetsutarou Yahata, Fujiko Someya, Minoru Hasegawa, Manabu Fujimoto, Kazuhiko Takehara, Yasuhito Hamaguchi
OBJECTIVE: Severe skin sclerosis in patients with systemic sclerosis (SSc) can result in a loss of hand function. The aim of this study is to examine the long-term changes of finger passive range of motion (ROM) in Japanese SSc patients treated with self-administered stretching. METHODS: This is a single center, retrospective, observational cohort study. Forty-three Japanese patients with SSc were given instructions on self-administered stretching. ROM was assessed using a goniometer on their first visit and after 1 year, 3 years, 5 years, and 9 years...
April 18, 2018: Modern Rheumatology
P Vivek Vardhan, Lata Israni Shukla
The present article focuses on the influence of gamma irradiation and post-irradiation storage conditions on FT-IR spectra of 1 mm thick polystyrene irradiated with 51, 77 and 129 kGy. The increase in amplitude corresponding to 3600, 3400 and 2100 cm- 1 stretching frequencies clearly showing the formation of O-H and C=O bonds (~ 25%). On prolonged storage (2160 h) in the dark, there is an increase in O-H group (~ 28%). The electron cloud facilitates the formation of hydroxyl group in irradiated polystyrene...
April 17, 2018: Radiation and Environmental Biophysics
N Pairet, S Mang, G Fois, M Keck, M Kühnbach, J Gindele, M Frick, P Dietl, D J Lamb
Mechanical ventilation is an important tool for supporting critically ill patients but may also exert pathological forces on lung cells leading to Ventilator-Induced Lung Injury (VILI). We hypothesised that inhibition of the force-sensitive transient receptor potential vanilloid (TRPV4) ion channel may attenuate the negative effects of mechanical ventilation. Mechanical stretch increased intracellular Ca2+ influx and induced release of pro-inflammatory cytokines in lung epithelial cells that was partially blocked by about 30% with the selective TRPV4 inhibitor GSK2193874, but nearly completely blocked with the pan-calcium channel blocker ruthenium red, suggesting the involvement of more than one calcium channel in the response to mechanical stress...
2018: PloS One
Pähr Engström, Kristina Tedroff
BACKGROUND: Children with idiopathic toe-walking, a common pediatric condition, walk some or all of the time on their toes. This condition often causes parental concern, with repeated medical contacts and a range of interventions including stretching, casts, injection of botulinum toxin A, and surgical procedures. The purpose of this cohort study was to document the natural history of this condition. METHODS: In a population-based cohort of 1,401 healthy 5.5-year-old Swedish children, we found the prevalence of idiopathic toe-walking to be approximately 5% (63 of 1,401)...
April 18, 2018: Journal of Bone and Joint Surgery. American Volume
Atul Kumar Sharma, Nitesh Arora, M M Joglekar
This paper reports an energy-based method for the dynamic pull-in instability analysis of a spherical dielectric elastomer (DE) balloon subjected to a quasi-statically applied inflation pressure and a Heaviside step voltage across the balloon wall. The proposed technique relies on establishing the energy balance at the point of maximum stretch in an oscillation cycle, followed by the imposition of an instability condition for extracting the threshold parameters. The material models of the Ogden family are employed for describing the hyperelasticity of the balloon...
March 2018: Proceedings. Mathematical, Physical, and Engineering Sciences
K E N'souglo, A Srivastava, S Osovski, J A Rodríguez-Martínez
At high strain rates, the fragmentation of expanding structures of ductile materials, in general, starts by the localization of plastic deformation in multiple necks. Two distinct mechanisms have been proposed to explain multiple necking and fragmentation process in ductile materials. One view is that the necking pattern is related to the distribution of material properties and defects. The second view is that it is due to the activation of specific instability modes of the structure. Following this, we investigate the emergence of necking patterns in porous ductile bars subjected to dynamic stretching at strain rates varying from 103   s -1 to 0...
March 2018: Proceedings. Mathematical, Physical, and Engineering Sciences
Janet E Del Bene, José Elguero, Ibon Alkorta
Ab initio MP2/aug'-cc-pVTZ calculations have been performed to investigate the complexes of CO₂ with the azoles pyrrole, pyrazole, imidazole, 1,2,3- and 1,2,4-triazole, tetrazole and pentazole. Three types of complexes have been found on the CO₂:azole potential surfaces. These include ten complexes stabilized by tetrel bonds that have the azole molecule in the symmetry plane of the complex; seven tetrel-bonded complexes in which the CO₂ molecule is perpendicular to the symmetry plane; and four hydrogen-bonded complexes...
April 14, 2018: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
Marcelo Camargo Saad, Rodrigo Antunes de Vasconcelos, Letícia Villani de Oliveira Mancinelli, Matheus Soares de Barros Munno, Rogério Ferreira Liporaci, Débora Bevilaqua Grossi
OBJECTIVE: To evaluate the effect of three types of exercise intervention in patients with patellofemoral pain and to verify the contributions of each intervention to pain control, function, and lower extremity kinematics. METHODS: A randomized controlled, single-blinded trial was conducted. Forty women with patellofemoral pain were randomly allocated into four groups: hip exercises, quadriceps exercises, stretching exercises and a control group (no intervention)...
April 4, 2018: Brazilian Journal of Physical Therapy
Jonathan M Voss, Kaitlyn C Fischer, Etienne Garand
We present the infrared predissociation (IRPD) study of microsolvated GlyH+ (H2 O)n and GlyH+ (D2 O)n clusters, formed inside a cryogenic ion trap via condensation of H2 O or D2 O onto the protonated glycine ions. The resulting IRPD spectra, showing characteristic O-H and O-D stretches, indicate that H/D exchange reactions are quenched when the ion trap is held at 80K, minimizing the presence of isotopomers. Comparisons of GlyH+ (H2 O)n and GlyH+ (D2 O)n spectra clearly highlight and distinguish the vibrational signatures of the water solvent molecules from those of the core GlyH+ ion, allowing for quick assessment of solvation structures...
April 16, 2018: Journal of Physical Chemistry Letters
Lina Zheng, Pramod Kulkarni, M Eileen Birch, Kevin Ashley, Shijun Wei
A Raman spectroscopy based method has been developed for measurement of trace airborne concentrations of respirable crystalline silica (RCS) using various aerosol sampling and analysis techniques. Three aerosol micro-concentration techniques were investigated for effective coupling of collected particulate samples with micro-Raman spectroscopy: i) direct analysis on a particulate filter after focused aerosol collection using a converging nozzle; ii) analysis of dried particulate de-posit on a filter obtained directly from the aerosol phase using the Spotsampler™ device; and iii) analysis of a spot (~1-3 mm diameter) obtained by redepositing the particulate sample, after low-temperature plasma ashing, of an air sample collected on a filter...
April 16, 2018: Analytical Chemistry
Luka Lipar, Pia Vovk, Tereza Weiss, Jus Ksela
Swallow syncope is a rare dysautonomic syndrome characterized by temporary loss of consciousness upon swallowing solid foods or liquids, displaying primarily in individuals with an underlying structural or functional esophageal or cardiac pathology. However, the evidence also suggests that isolated vagal dysfunction or abnormal reactions of esophageal mechanoreceptors after mechanical irritation, demyelination, or trauma can potentially evoke  a cardioinhibitory response or vasodepression upon swallowing. We present a case of a 49-year-old otherwise healthy female patient who developed swallow syncope two weeks after whiplash neck injury acquired in a rear-end collision...
March 5, 2018: Heart Surgery Forum
Lester Andrews, Han-Gook Cho, Zongtang Fang, Monica Vasiliu, David A Dixon
Laser ablation of tungsten metal provides W atoms which react with phosphine and arsine during condensation in excess argon and neon, leading to major new infrared (IR) absorptions. Annealing, UV irradiation, and deuterium substitution experiments coupled with electronic structure calculations at the density functional theory level led to the assignment of the observed IR absorptions to the E≡WH3 and HE═WH2 molecules for E = P and As. The potential energy surfaces for hydrogen transfer from PH3 to the W were calculated at the coupled-cluster CCSD(T)/complete basis set level...
April 16, 2018: Inorganic Chemistry
Bethany A Wellen Rudd, Andrew S Vidalis, Heather C Allen
Of the major cations in seawater (Na+, Mg2+, Ca2+, K+), Ca2+ is found to be the most enriched in fine sea spray aerosols (SSA). In this work, we investigate the binding of Ca2+ to the carboxylic acid headgroup of palmitic acid (PA), a marine-abundant fatty acid, and the impact such binding has on the stability of PA monolayers in both equilibrium and non-equilibrium systems. A range of Ca2+ conditions from 10 μM to 300 mM was utilized to represent the relative concentration of Ca2+ in high and low relative humidity aerosol environments...
April 16, 2018: Physical Chemistry Chemical Physics: PCCP
Yasuyuki Morita, Takahiro Yamashita, Toku Toku, Yang Ju
PURPOSE: There is a need for efficient stem cell-to-tenocyte differentiation techniques for tendon tissue engineering. More than 1 week is required for tenogenic differentiation with chemical stimuli, including co-culturing. Research has begun to examine the utility of mechanical stimuli, which reduces the differentiation time to several days. However, the precise length of time required to differentiate human bone marrow-derived mesenchymal stem cells (hBMSCs) into tenocytes has not been clarified...
2018: Acta of Bioengineering and Biomechanics
Olfa Ferchichi, Alexander Alijah, Thibaud Cours, Nejm-Eddine Jaidane, Najoua Derbel
Dioxygen difluoride is a tough molecule that has defied accurate theoretical description for many decades. In the present work we have identified the reason for this resistance: the flatness of the OO, and more important OF, stretching potential energy curves, which make it difficult to localise the global minimum. It is not related to the weak multi-reference character. Using high-level CCSD(T)-F12/VTZ-F12 ab initio theory, the global minimum has been properly located and vibrationally averaged bond lengths obtained...
April 16, 2018: Physical Chemistry Chemical Physics: PCCP
Meena Siddiqui, Ahhyun S Nam, Serhat Tozburun, Norman Lippok, Cedric Blatter, Benjamin J Vakoc
Existing three-dimensional optical imaging methods excel in controlled environments but are difficult to deploy over large, irregular and dynamic fields. This has limited imaging in areas such as material inspection and medicine. To better address these applications, we developed methods in optical coherence tomography (OCT) to efficiently interrogate sparse scattering fields, i.e., those in which most locations (voxels) do not generate meaningful signal. Frequency comb sources are used to superimpose reflected signals from equispaced locations through optical subsampling...
2018: Nature Photonics
Anna Powers, Yohann Scribano, David Lauvergnat, Elsy Mebe, David M Benoit, Zlatko Bačić
We report a theoretical study of the frequency shift (redshift) of the stretching fundamental transition of an H2 molecule confined inside the small dodecahedral cage of the structure II clathrate hydrate and its dependence on the condensed-phase environment. In order to determine how much the hydrate water molecules beyond the confining small cage contribute to the vibrational frequency shift, quantum five-dimensional (5D) calculations of the coupled translation-rotation eigenstates are performed for H2 in the v=0 and v=1 vibrational states inside spherical clathrate hydrate domains of increasing radius and a growing number of water molecules, ranging from 20 for the isolated small cage to over 1900...
April 14, 2018: Journal of Chemical Physics
Hiroshi Kohguchi, Pavol Jusko, Koichi M T Yamada, Stephan Schlemmer, Oskar Asvany
The protonated oxygen molecule, O2 H+ , and its helium complex, He-O2 H+ , have been investigated by vibrational action spectroscopy in a cryogenic 22-pole ion trap. For the He-O2 H+ complex, the frequencies of three vibrational bands have been determined by predissociation spectroscopy. The elusive O2 H+ has been characterized for the first time by high-resolution rovibrational spectroscopy via its ν1 OH-stretching band. Thirty-eight rovibrational fine structure transitions with partly resolved hyperfine satellites were measured (56 resolved lines in total)...
April 14, 2018: Journal of Chemical Physics
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