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Brittney A Luc-Harkey, Jason R Franz, Elena Losina, Brian Pietrosimone
BACKGROUND: Individuals with anterior cruciate ligament reconstruction (ACLR) demonstrate persistent alterations in walking gait characteristics that contribute to poor long-term outcomes. Higher kinesiophobia, or fear of movement/re-injury, may result in the avoidance of movements that increase loading on the ACLR limb. RESEARCH QUESTION: Determine the association between kinesiophobia and walking gait characteristics in physically active individuals with ACLR...
June 18, 2018: Gait & Posture
Matthias Paul, Lun Yue, Stefanie Gräfe
We examine the circular dichroism in the angular distribution of photoelectrons of triatomic model systems ionized by strong-field ionization. Following our recent work on this effect [Paul, Yue, and Gräfe, J. Mod. Opt. 64, 1104 (2017)JMOPEW0950-034010.1080/09500340.2017.1299883], we demonstrate how the symmetry and electronic structure of the system is imprinted into the photoelectron momentum distribution. We use classical trajectories to reveal the origin of the threefolded pattern in the photoelectron momentum distribution, and show how an asymmetric nuclear configuration of the triatomic system effects the photoelectron spectra...
June 8, 2018: Physical Review Letters
Sebastian Wilde, Dongxin Ma, Tobias Koch, Anne Bakker, Dario Gonzalez-Abradelo, Linda Stegemann, Constantin G Daniliuc, Harald Fuchs, Hongying Gao, Nikos L Doltsinis, Lian Duan, Cristian A Strassert
The synthesis of new Pt(II) complexes bearing tailored cyclometalated C^N*N^C luminophores is reported along with their photophysical properties. The emission of the monomeric species can be blue shifted upon formal isosteric replacement of two C-H units by N atoms at the two cyclometalating rings. Their remarkable stability upon sublimation was demonstrated by means of scanning tunneling microscopy, which also revealed a defined self-assembly behavior leading to supramolecular arrays, showing a 3-fold symmetry in 2D-confined monolayers...
June 22, 2018: ACS Applied Materials & Interfaces
Luca Cera, Christoph A Schalley
Self-organization in synthetic chemical systems is quickly developing into a powerful strategy for designing new functional materials. As self-organization requires the system to exist far from thermodynamic equilibrium, chemists have begun to go beyond the classical equilibrium self-assembly that is often applied in bottom-up supramolecular synthesis, and to learn about the surprising and unpredicted emergent properties of chemical systems that are characterized by a higher level of complexity and extended reactivity networks...
June 21, 2018: Advanced Materials
Peter C Revenaugh, Ryan M Smith, Max A Plitt, Lisa Ishii, Kofi Boahene, Patrick J Byrne
Importance: Facial nerve deficits cause significant functional and social consequences for those affected. Existing techniques for dynamic restoration of facial nerve function are imperfect and result in a wide variety of outcomes. Currently, there is no standard objective instrument for facial movement as it relates to restorative techniques. Objective: To determine what objective instruments of midface movement are used in outcome measurements for patients treated with dynamic methods for facial paralysis...
June 21, 2018: JAMA Facial Plastic Surgery
Wayne M Itano, Lance L Lambert
Background: Paleozoic holocephalian tooth plates are rarely found articulated in their original positions. When they are found isolated, it is difficult to associate the small, anterior tooth plates with the larger, more posterior ones. Tooth plates are presumed to have evolved from fusion of tooth files. However, there is little fossil evidence for this hypothesis. Results: We report a tooth plate having nearly perfect bilateral symmetry from the Mississippian (Chesterian Stage) Bangor Limestone of Franklin County, Alabama, USA...
2018: Zoological Letters
Derek Richards
Data sourcesPubMed, Scopus, Web of Science and Google Scholar databases. Websites of scientific societies of dental traumatology, paediatric dentistry, endodontics, oral-maxillofacial surgery and World Health Organization and the US Centres for Disease Control and Prevention were searched. There were no language restrictions, but the search was limited to the years 1996-2016.Study selectionObservational studies reporting proportions of individuals with at least one TDI (prevalence) and who developed TDI (incidence rate) were considered...
June 2018: Evidence-based Dentistry
Augusto L Araújo, Gerson J Ferreira, Tome M Schmidt
We combine first principles calculations with a group theory analysis to investigate topological phase transitions in the stacking of SnTe monolayers. We show that distinct finite stacking yields different symmetry-imposed degeneracy, which dictates the hybridization properties of opposite surface states. For SnTe aligned along the [001] direction, an (even) odd number of monolayers yields a (non)symmorphic space group. For the symmorphic case, the hybridization of surface states lead to band inversions and topological phase transitions as the sample height is reduced...
June 21, 2018: Scientific Reports
Gwanho Yoon, Dasol Lee, Ki Tae Nam, Junsuk Rho
A polarization independent holographic beam splitter that generates equal-intensity beams based on geometric metasurface is demonstrated. Although conventional geometric metasurfaces have the advantages of working over a broad frequency range and having intuitive design principles, geometric metasurfaces have the limitation that they only work for circular polarization. In this work, Fourier holography is used to overcome this limitation. A perfect overlap resulting from the origin-symmetry of the encoded image enables polarization independent operation of geometric metasurfaces...
June 21, 2018: Scientific Reports
Isidoro Martínez, Coriolan Tiusan, Michel Hehn, Mairbek Chshiev, Farkhad G Aliev
The observation of perpendicular magnetic anisotropy (PMA) at MgO/Fe interfaces boosted the development of spintronic devices based on ultrathin ferromagnetic layers. Yet, magnetization reversal in the standard magnetic tunnel junctions (MTJs) with competing PMA and in-plane anisotropies remains unclear. Here we report on the field induced nonvolatile broken symmetry magnetization reorientation transition from the in-plane to the perpendicular (out of plane) state at temperatures below 50 K. The samples were 10 nm thick Fe in MgO/Fe(100)/MgO as stacking components of V/MgO/Fe/MgO/Fe/Co double barrier MTJs with an area of 20 × 20 μm2 ...
June 21, 2018: Scientific Reports
Liwen Chen, Han Seung Lee, Sangwoo Lee
Close-packed structures of uniformly sized spheres are ubiquitous across diverse material systems including elements, micelles, and colloidal assemblies. However, the controlled access to a specific symmetry of self-assembled close-packed spherical particles has not been well established. We investigated the ordering of spherical block copolymer micelles in aqueous solutions that was induced by rapid temperature changes referred to as quenching. As a function of quench depth, the quenched self-assembled block copolymer micelles formed three different close-packed structures: face-centered cubic (fcc), random stacking of hexagonal-close-packed layers (rhcp), and hexagonal-close-packed (hcp)...
June 21, 2018: Proceedings of the National Academy of Sciences of the United States of America
Jagadeesan Ganapathy, Malathy Palayam, Gautam Pennathur, Aravindhan Sanmargam, Gunasekaran Krishnasamy
BACKGROUND: Hemoglobin (Hb) molecule consists of α2β2 dimers arranged in fashion having pseudo-222 symmetry. The subunits are composed of the specific functional prosthetic group "heme'' and a protein moiety "globin". Bird Hbs are functionally similar to mammalian Hbs and regulated by inositol pentaphosphate (IPP) but they are structurally dissimilar with mammalian Hbs in adaptation to vital environment such as high altitudes, high speed flights and oxygen affinity. The insufficient structural studies on avian Hbs limit us to understand their degree of adaptation to such critical environments...
June 20, 2018: Protein and Peptide Letters
Manuel Robustillo, Luis Parra Pont, Georgios Pafitanis, Pedro Ciudad, Daniel Grandes, Israel Iglesias
DIEP flap has become the gold standard method for patients undergoing autologous breast reconstruction; however, previous surgery or scars in the abdominal area have been considered a relative contraindication for the use of abdominal tissue. Longitudinal midline abdominal scars may be specially problematic because of the poor midline crossover of blood and the high risk of necrosis of the distal flap. Patients with small breast may be easily reconstructed with hemi-DIEP flap; however, patients with large breast need more tissue available...
January 2018: Indian Journal of Plastic Surgery: Official Publication of the Association of Plastic Surgeons of India
Jodi Vertz, Diana Deblanc, Marie Rhodin, Thilo Pfau
In trotting horses, movement asymmetry is associated with ground reaction force asymmetry. In humans, limb length differences influence contralateral force production. Here we investigate whether horses, in immediate reaction to limb length changes, show movement asymmetry adaptations consistent with reported force differences. Aim of this study was to quantify pelvic and compensatory head and withers movement asymmetry as a function of limb length changes after application of orthotic lifts. In this experimental study movement asymmetry of eleven trotting horses was calculated from vertical displacement of poll, withers, sacrum and left and right tuber coxae with inertial sensors...
2018: PloS One
Ping Yu, Jianxiong Li, Shuang Zhang, Zhongwei Jin, Gisela Schütz, Chengwei Qiu, Michael Hirscher, Na Liu
Janus monolayers have long been captivated as a popular notion for breaking in-plane and out-of-plane structural symmetry. Originated from chemistry and materials science, the concept of Janus functions have been recently extended to ultrathin metasurfaces by arranging meta-atoms asymmetrically with respect to the propagation or polarization direction of the incident light. However, such metasurfaces are intrinsically static and the information they carry can be straightforwardly decrypted by scanning the incident light directions and polarization states, once the devices are fabricated...
June 21, 2018: Nano Letters
Ronak Sandy, Quentin Hennocq, Johan Nysjö, Guillaume Giran, Martin Friess, Roman Hossein Khonsari
Intentional cranial deformations are the result of external mechanical forces exerted on the skull vault that modify the morphology of various craniofacial structures such as the skull base, the orbits and the zygoma. In this controlled study, we investigated the 3D shape of the orbital inner mould and the orbital volume in various types of intentional deformations and in adult non-operated scaphocephaly - the most common type of craniosynostosis - using dedicated morphometric methods. CT scans were performed on 32 adult skulls with intentional deformations, 21 adult skull with scaphocephaly and 17 non-deformed adult skulls from the collections of the Muséum national d'Histoire naturelle in Paris, France...
June 21, 2018: Journal of Anatomy
Ella Been, Sara Shefi, Leonid Kalichman, Jeannie F Bailey, Michalle Soudack
Spinal muscle cross-sectional area has been highly associated with spinal pathology. Despite the medium-high prevalence of spinal pathology in children, there is very limited knowledge regarding muscle size and growth pattern in individuals younger than 20 years of age. The aim of this study is to analyze the change in size and symmetry of spinal muscles (erector spinae, multifidus, psoas and quadratus lumborum) in children 2-20 years of age. We studied reformatted images from 91 abdominal computed tomographic scans of children aged 2-20 years, from an existing imaging dataset...
June 21, 2018: Journal of Anatomy
Olga A Stasyuk, Robert Sedlak, Célia Fonseca Guerra, Pavel Hobza
Interaction energies computed with density functional theory can be divided into physically meaningful components by symmetry-adapted perturbation theory (DFT-SAPT) or the canonical energy decomposition analysis (EDA). In this work, the decomposition results obtained by these schemes were compared for more than 200 hydrogen-, halogen-, and pnicogen-bonded, dispersion-bound, and mixed complexes to investigate their similarity in the evaluation of the nature of noncovalent interactions. BLYP functional with D3(BJ) correction was used for the EDA scheme, whereas asymptotically corrected PBE0 functional for DFT-SAPT provided some of the best combinations for description of noncovalent interactions...
June 21, 2018: Journal of Chemical Theory and Computation
Huynh V Phuc, Nguyen N Hieu, Bui D Hoi, Chuong V Nguyen
In this work, using density functional theory we investigated systematically the electronic properties and Schottky barrier modulation in a multilayer graphene/bilayer-GaSe heterostructure by varying the interlayer spacing and by applying an external electric field. At the equilibrium state, the graphene is bound to bilayer-GaSe by a weak van der Waals interaction with the interlayer distance d of 3.40 Å with the binding energy per carbon atom of -37.71 meV. The projected band structure of the graphene/bilayer-GaSe heterostructure appears as a combination of each band structure of graphene and bilayer-GaSe...
June 21, 2018: Physical Chemistry Chemical Physics: PCCP
Kai Ma, Yunye Gong, Tangi Aubert, Melik Z Turker, Teresa Kao, Peter C Doerschuk, Ulrich Wiesner
Nanometre-sized objects with highly symmetrical, cage-like polyhedral shapes, often with icosahedral symmetry, have recently been assembled from DNA1-3 , RNA 4 or proteins5,6 for applications in biology and medicine. These achievements relied on advances in the development of programmable self-assembling biological materials7-10 , and on rapidly developing techniques for generating three-dimensional (3D) reconstructions from cryo-electron microscopy images of single particles, which provide high-resolution structural characterization of biological complexes11-13 ...
June 20, 2018: Nature
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