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https://www.readbyqxmd.com/read/28732420/letter-to-the-editor-regarding-impact-of-intraoperative-monitoring-during-elective-complex-spinal-fusions-%C3%A2-4-levels-on-30-day-complication-and-readmission-rates-a-single-institutional-study-of-643-adult-spinal-deformity-patients
#1
https://www.readbyqxmd.com/read/28732313/biomechanics-of-cell-rearrangements-in-drosophila
#2
REVIEW
Boris Guirao, Yohanns Bellaïche
To acquire their adequate size and shape, living tissues grow and substantially deform as they develop. To do so, the cells making up the tissue can grow and deform as well, but they can also divide, intercalate and die. Among those cell behaviors, cell intercalation, also named cell rearrangement, is a major contributor to the morphogenesis of many cohesive tissues since it enables tissues to drastically deform as they develop while keeping their cohesiveness and avoiding extreme deformation of their cells...
July 18, 2017: Current Opinion in Cell Biology
https://www.readbyqxmd.com/read/28731878/correlation-of-corneal-biomechanical-stiffness-with-refractive-error-and-ocular-biometry-in-a-pediatric-population
#3
Jyoti Matalia, Mathew Francis, Pooja Gogri, Pratibha Panmand, Himanshu Matalia, Abhijit Sinha Roy
PURPOSE: To assess the correlation between corneal biomechanical stiffness and refractive error (RE) in the pediatric population. METHODS: A total of 733 pediatric eyes were included in the study retrospectively. All eyes underwent corneal tomography (Pentacam), RE assessment, and air-puff deformation (Corvis-ST). Waveform analyses of deformation provided corneal stiffness (CS) and extraocular tissue stiffness (EOS). Eyes were subgrouped into emmetropia [manifest refraction spherical equivalent (MRSE) ∼ 0 D], hyperopia (MRSE > 0 D), myopia I (MRSE between 0 D and -3 D), myopia II (MRSE between -3 D and -6 D), and myopia III (MRSE greater than -6 D) for multivariate analyses...
July 19, 2017: Cornea
https://www.readbyqxmd.com/read/28731746/transference-of-fermi-contour-anisotropy-to-composite-fermions
#4
Insun Jo, K A Villegas Rosales, M A Mueed, L N Pfeiffer, K W West, K W Baldwin, R Winkler, Medini Padmanabhan, M Shayegan
There has been a surge of recent interest in the role of anisotropy in interaction-induced phenomena in two-dimensional (2D) charged carrier systems. A fundamental question is how an anisotropy in the energy-band structure of the carriers at zero magnetic field affects the properties of the interacting particles at high fields, in particular of the composite fermions (CFs) and the fractional quantum Hall states (FQHSs). We demonstrate here tunable anisotropy for holes and hole-flux CFs confined to GaAs quantum wells, via applying in situ in-plane strain and measuring their Fermi wave vector anisotropy through commensurability oscillations...
July 7, 2017: Physical Review Letters
https://www.readbyqxmd.com/read/28731083/mutable-polyelectrolyte-tube-arrays-mesoscale-modeling-and-lateral-force-microscopy
#5
Steven W Cranford, Lin Han, Christine Ortiz, Markus J Buehler
In this study, the pH-dependent friction of layer-by-layer assemblies of poly(allylamine hydrochloride) and poly(acrylic acid) (PAH/PAA) are quantified for microtube array structures via experimental and simulated lateral force microscopy (LFM). A novel coarse-grain tube model is developed, utilizing a molecular dynamics (MD) framework with a Hertzian soft contact potential (such that F ∼ δ(3/2)) to allow the efficient dynamic simulation of 3D arrays consisting of hundreds of tubes at micrometer length scales...
July 21, 2017: Soft Matter
https://www.readbyqxmd.com/read/28730818/nanoscale-mechanics-of-the-solid-electrolyte-interphase-on-lithiated-silicon-electrodes
#6
Haoran Wang, Huck Beng Chew
The ~300% volume changes of lithiated silicon electrodes (LixSi) during electrochemical cycling lead to cracking of the solid electrolyte interface (SEI). Here, we report how strain is transferred from LixSi to two primary inorganic SEI components: LiF and Li2O. Our first principle calculations show that LiF, effectively bonded on LixSi at x > 1, enables the entire interface structure to deform plastically by forming delocalized stable voids. In contrast, Li2O tightly bonded to LixSi is stiffer, and deforms rigidly across all x...
July 21, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28730248/clavicle-anatomical-osteosynthesis-plate-breakage-failure-analysis-report-based-on-patient-morphological-parameters
#7
Rodica Marinescu, Vasile Iulian Antoniac, Dan Ioan Stoia, Dan Constantin Lăptoiu
Clavicle fracture reported incidence is about 5% of fractures in adult; among them, those located in the middle third of the shaft represent more than 80% from the total of cases. Due to the special morphological and biomechanical constraints of the clavicle, several methods for restoring morphological integrity in these fractures are described, including conservative, non-surgical treatment. The last 10 years of clinical studies in the field have favored the surgical treatment for selected cases; several osteosynthesis implants are in use - mostly anatomical plates with specific advantages and documented complications...
2017: Romanian Journal of Morphology and Embryology, Revue Roumaine de Morphologie et Embryologie
https://www.readbyqxmd.com/read/28729893/mechanically-and-electrically-robust-self-assembled-monolayers-for-large-area-tunneling-junctions
#8
Yanxi Zhang, Xinkai Qiu, Pavlo Gordiichuk, Saurabh Soni, Theodorus L Krijger, Andreas Herrmann, Ryan C Chiechi
This paper examines the relationship between mechanical deformation and the electronic properties of self-assembled monolayers (SAMs) of the oligothiophene 4-([2,2':5',2″:5″,2‴-quaterthiophen]-5-yl)butane-1-thiol (T4C4) in tunneling junctions using conductive probe atomic force microscopy (CP-AFM) and eutectic Ga-In (EGaIn). We compared shifts in conductivity, transition voltages of T4C4 with increasing AFM tip loading force to alkanethiolates. While these shifts result from an increasing tilt angle from penetration of the SAM by the AFM tip for the latter, we ascribe them to distortions of the π system present in T4C4, which is more mechanically robust than alkanethiolates of comparable length; SAMs comprising T4C4 shows about five times higher Young's modulus than alkanethiolates...
July 13, 2017: Journal of Physical Chemistry. C, Nanomaterials and Interfaces
https://www.readbyqxmd.com/read/28729671/linking-rheology-and-printability-for-dense-and-strong-ceramics-by-direct-ink-writing
#9
Amin M'Barki, Lydéric Bocquet, Adam Stevenson
Direct ink writing of dense and strong ceramic objects remains an important open challenge. We develop a universal dimensionless criterion for printing such objects. Boehmite, an Al2O3 precursor, was used to assess the rheological properties leading to dense structures in ceramics manufactured by direct ink writing. Boehmite suspensions undergo time dependent gelation, thus providing a rheological laboratory of flow behaviours that can be correlated with printability requirements. We measured the evolution of rheological properties over several days and quantified the deformation of simple printed shapes at different aging times...
July 20, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28729350/structures-of-the-crispr-genome-integration-complex
#10
Addison V Wright, Jun-Jie Liu, Gavin J Knott, Kevin W Doxzen, Eva Nogales, Jennifer A Doudna
CRISPR-Cas systems depend on the Cas1-Cas2 integrase to capture and integrate short foreign DNA fragments into the CRISPR locus, enabling adaptation to new viruses. We present crystal structures of Cas1-Cas2 bound to both donor and target DNA in intermediate and product integration complexes, as well as a cryo-electron microscopy structure of the full CRISPR locus integration complex including the accessory protein Integration Host Factor (IHF). The structures show unexpectedly that indirect sequence recognition dictates integration site selection by favoring deformation of the repeat and the flanking sequences...
July 20, 2017: Science
https://www.readbyqxmd.com/read/28728866/deformability-and-size-based-microcapsule-sorting
#11
Doriane Vesperini, Oriane Chaput, Nadège Munier, Pauline Maire, Florence Edwards-Lévy, Anne-Virginie Salsac, Anne Le Goff
Biomedical applications often require to sort cells according to their physical properties, such as size, density or deformability. In recent years, microfluidics has provided a variety of tools to sort micro-objects. We present here a simple microfluidic device consisting of a channel containing a semi-cylindrical obstacle against which capsules are squeezed by the flow, followed by a diverging chamber where streamlines separate. We demonstrate that this basic system is capable of sorting elastic microcapsules according to their size at low flow strength, and according to the stiffness of their membrane at high flow strength...
July 17, 2017: Medical Engineering & Physics
https://www.readbyqxmd.com/read/28728741/surgical-correction-of-maxillofacial-skeletal-deformities
#12
David A Cottrell, Brian Farrell, Luis Ferrer-Nuin, Sanford Ratner
No abstract text is available yet for this article.
August 2017: Journal of Oral and Maxillofacial Surgery
https://www.readbyqxmd.com/read/28728387/effects-of-environmental-enrichment-on-behaviour-physiology-and-performance-of-pigs-a-review
#13
Mbusiseni Vusumuzi Mkwanazi, Cyprial Ndumiso Ncobela, Arnold Tapera Kanengoni, Michael Chimonyo
The aim of this paper is to critically analyse and synthesise existing knowledge concerning the use of environmental enrichment and its effect on behaviour, physiology and performance of pigs housed in intensive production systems. The objective is also to provide clarity as to what constitute successful enrichment and recommend on when and how enrichment should be used. Environmental enrichment is usually understood as an attempt to improve animal welfare and to lesser extent, performance. Common enrichment objects used are straw bedding, suspended rope and wood shavings, toys, rubber tubing, coloured plastic keys, table tennis balls, chains and strings...
June 26, 2017: Asian-Australasian Journal of Animal Sciences
https://www.readbyqxmd.com/read/28728261/-characteristics-of-the-joint-involvement-in-fibrodysplasia-ossificans-progressiva-and-follow-up
#14
J Zhu, Y Liu, Y Yang, J M Lai, G X Su, M Kang, S N Li, Z X Zhou, F Q Wu
Objective: To summarize the clinical data of 15 patients with fibrodysplasia ossificans progressiva (FOP), follow up and analyze the characteristics of the joint involvement in FOP. Method: From May 2005 to December 2016, fifteen FOP cases had been diagnosed in the Children's Hospital Capital Institute of Pediatrics. All medical records and follow-up data were collected and a retrospective analysis was made on the joint involvement in FOP. Pearson correlation analysis was used for data, P<0.05 for the difference was statistically significant...
July 2, 2017: Zhonghua Er Ke za Zhi. Chinese Journal of Pediatrics
https://www.readbyqxmd.com/read/28728206/-subaxial-cervical-spine-injuries-treatment-recommendations-of-the-german-orthopedic-and-trauma-society
#15
Philipp Schleicher, Matti Scholz, Frank Kandziora, Andreas Badke, Florian Hans Brakopp, Helmut Klaus Friedrich Ekkerlein, Erol Gercek, Rene Hartensuer, Philipp Hartung, Jan-Sven Gilbert Jarvers, Philipp Kobbe, Stefan Matschke, Robert Morrison, Christian W Müller, Miguel Pishnamaz, Maximilian Reinhold, Klaus John Schnake, Gregor Schmeiser, Gregor Stein, Bernhard Ullrich, Thomas Weiß, Volker Zimmermann
In a consensus process during four sessions in 2016, the working group "lower cervical spine" of the German Society for Orthopedic and Trauma Surgery (DGOU), formulated "Therapeutic Recommendations for the Lower Cervical Spine", taking into consideration the current literature. Therapeutic goals are a permanently stable, painless cervical spine and the protection against secondary neurologic damage while retaining the greatest possible amount of motion and spinal profile. Due to its ease of use and its proven good reliability, the AOSpine classification for subaxial cervical injuries should be used...
July 20, 2017: Zeitschrift Für Orthopädie und Unfallchirurgie
https://www.readbyqxmd.com/read/28728047/early-life-co-exposures-to-a-real-world-pah-mixture-and-hypoxia-result-in-later-life-and-next-generation-consequences-in-medaka-oryzias-latipes
#16
Jingli Mu, Melissa Chernick, Wu Dong, Richard T Di Giulio, David E Hinton
Acute effects of individual and complex mixtures of polycyclic aromatic hydrocarbons (PAHs) are well documented in vertebrate species. Hypoxia in fish reduces metabolic rate and reproduction. However, less is known about the later life consequences stemming from early-life exposure to PAHs or hypoxia, particularly their co-exposure. To address this, medaka (Oryzias latipes) embryos were exposed to a complex PAH mixture sediment extract from the Elizabeth River, VA (ERSE) at concentrations of 0.1, 0.5, or 1...
June 27, 2017: Aquatic Toxicology
https://www.readbyqxmd.com/read/28728013/dynamic-and-elastic-shape-transitions-in-curved-escrt-iii-filaments
#17
REVIEW
Nicolas Chiaruttini, Aurélien Roux
The ESCRT-III complex is an evolutionary ancient and conserved complex that catalyzes fission of lipid membranes from the lumen of the neck in many, if not all processes requiring this specific fission reaction. The ESCRT-III membrane remodeling complex is unique as its molecular and polymeric structures do not intuitively suggests how it could deform and break lipid membranes. Here we review the common structural features of the ESCRT-III subunits, and the shape diversity of the various filamentous forms. We propose a simple geometry and elasticity framework that could help to isolate which features of the ESCRT-III filaments are common to all filamentous forms as well as to explain their diversity...
July 17, 2017: Current Opinion in Cell Biology
https://www.readbyqxmd.com/read/28727996/efficacy-and-safety-of-one-stage-posterior-hemivertebral-resection-for-unbalanced-multiple-hemivertebrae-a-more-than-2-year-follow-up
#18
Yong Huang, Ganjun Feng, Yueming Song, Limin Liu, Chunguang Zhou, Lei Wang, Zhongjie Zhou, Xi Yang
OBJECTIVE: One-stage posterior hemivertebral resection has been proven to be an effective, reliable surgical option for treating congenital scoliosis due to a single hemivertebra. To date, however, no studies of treating unbalanced multiple hemivertebrae have appeared. This study evaluated the efficacy and safety of one-stage posterior hemivertebral resection for unbalanced multiple hemivertebrae. PATIENTS AND METHODS: Altogether, we studied 15 patients with unbalanced multiple hemivertebrae who had undergone hemivertebral resection using the one-stage posterior approach with at least 2 years of follow-up...
July 12, 2017: Clinical Neurology and Neurosurgery
https://www.readbyqxmd.com/read/28727745/evaluation-of-tissue-displacement-and-regional-strain-in-the-achilles-tendon-using-quantitative-high-frequency-ultrasound
#19
Stijn Bogaerts, Catarina De Brito Carvalho, Lennart Scheys, Kaat Desloovere, Jan D'hooge, Frederik Maes, Paul Suetens, Koen Peers
The Achilles tendon has a unique structure-function relationship thanks to its innate hierarchical architecture in combination with the rotational anatomy of the sub-tendons from the triceps surae muscles. Previous research has provided valuable insight in global Achilles tendon mechanics, but limitations with the technique used remain. Furthermore, given the global approach evaluating muscle-tendon junction to insertion, regional differences in tendon mechanical properties might be overlooked. However, recent advancements in the field of ultrasound imaging in combination with speckle tracking have made an intratendinous evaluation possible...
2017: PloS One
https://www.readbyqxmd.com/read/28727414/graphene-based-three-dimensional-capacitive-touch-sensor-for-wearable-electronics
#20
Minpyo Kang, Jejung Kim, Bongkyun Jang, Youngcheol Chae, Jae-Hyun Kim, Jong-Hyun Ahn
The development of input device technology in a conformal and stretchable format is important for the advancement of various wearable electronics. Herein, we report a capacitive touch sensor with good sensing capabilities in both contact and non-contact modes, enabled by the use of graphene and a thin device geometry. This device can be integrated with highly deformable areas of the human body, such as the forearms and palms. This touch sensor detects multiple touch signals in acute recordings and recognizes the distance and shape of the approaching objects before direct contact is made...
July 20, 2017: ACS Nano
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