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Eman Allam, Philani Mpofu, Ahmed Ghoneima, Mihran Tuceryan, Katherine Kula
This study using three-dimensional cone beam computed tomography (CBCT) images of children determined relationships between nasal skeletal and soft tissue measurements and assessed the association with sex, age, and skeletal maturation stage. Following reliability studies, skeletal and soft tissue parameters were measured on coded CBCTs of 73 children (28M:45F;6-13 yoa). Pearson and Mantel correlations were used to analyze associations between skeletal and soft tissues. Partial Mantel correlations were used to study the associations between skeletal and soft tissue, adjusting for sex, age, and skeletal maturation...
April 23, 2018: Journal of Forensic Sciences
Megan C Kirkland, Alice Chen, Matthew B Downer, Brett J Holloway, Elizabeth M Wallack, Evan J Lockyer, Natasha C M Buckle, Courtney L Abbott, Michelle Ploughman
BACKGROUND: People with mild multiple sclerosis (MS) often report subtle deficits in balance and cognition but display no measurable impairment on clinical assessments. We examined whether hopping to a metronome beat had the potential to detect anticipatory motor control deficits among people with mild MS (Expanded Disability Status Scale ≤ 3.5). METHODS: Participants with MS (n = 13), matched controls (n = 9), and elderly subjects (n = 13) completed tests of cognition (Montreal Cognitive Assessment (MoCA)) and motor performance (Timed 25 Foot Walk Test (T25FWT))...
April 13, 2018: Clinical Biomechanics
Martin Riemer, Jonathan Shine, Thomas Wolbers
Cross-dimensional interference between spatial and temporal processing is well documented in humans, but the direction of these interactions remains unclear. The theory of metaphoric structuring states that space is the dominant concept influencing time perception, whereas time has little effect upon the perception of space. In contrast, theories proposing a common neuronal mechanism representing magnitudes argue for a symmetric interaction between space and time perception. Here, we investigated space-time interactions in realistic, large-scale virtual environments...
April 23, 2018: Hippocampus
Chengcheng Li, Yiye Ouyang, Chunjun Liu
No abstract text is available yet for this article.
March 31, 2018: Plastic and Reconstructive Surgery
Jose Mª Serra-Mestre, Francesco D'Andrea, Jose Maria Serra-Renom
No abstract text is available yet for this article.
March 31, 2018: Plastic and Reconstructive Surgery
Duc Nguyen, Gyeongwon Kang, Naihao Chiang, Xu Chen, Tamar Seideman, Mark C Hersam, George C Schatz, Richard P Van Duyne
Ultrahigh vacuum tip-enhanced Raman spectroscopy (UHV-TERS) is used to investigate adsorption of molecular oxygen (O2 ) on cobalt (II) phthalocyanine (CoPc) supported on Ag(111) single crystal surfaces, which is the initial step for the oxygen reduction reaction (ORR) using metal Pc catalysts. Two adsorption configurations are primarily observed, assigned as O2 /CoPc/Ag(111) and O/CoPc/Ag(111) based on scanning tunneling microscopy (STM) imaging, TERS, isotopologue substitution, and density functional theory (DFT) calculations...
April 23, 2018: Journal of the American Chemical Society
Daniel C Ashley, Elena Jakubikova
Twisting motions in six-coordinate trischelate transition-metal complexes have long been recognized as a potential reaction coordinate for nondissociative racemization by changing the coordination geometry from octahedral to trigonal prismatic in the transition state. These pathways have been previously established as the Bailar twist (conversion to D3 h symmetry) and the Ray-Dutt twist (conversion to C2 v symmetry). Twisting motions have been shown to be associated with changes in spin state and are therefore of relevance not only to thermal isomerization pathways but also to spin-crossover (SCO) and intersystem crossing mechanisms...
April 23, 2018: Inorganic Chemistry
Alexander N Bugrov, Anastasia Yu Zavialova, Ruslan Yu Smyslov, Tatyana D Anan'eva, Elena N Vlasova, Maxim V Mokeev, Artem E Kryukov, Gennady P Kopitsa, Vitaliy Pipich
Spherical nanoparticles of ZrO2 with 2 and 10 mol% EuO1.5 up to 20 nm size were prepared by the method of hydrothermal synthesis for luminescent functionalization of the polymer-inorganic nanocomposites based on poly(methyl methacrylate). Surface modification of oxide nanoparticles was carried out by 3-(trimethoxysilyl)propyl methacrylate, dimethoxymethylvinyl silane and 2-hydroxyethyl methacrylate to provide uniform distribution and to prevent agglomeration of nanosized filler in the polymer matrix. Polymer-inorganic composites were synthesized by in situ free radical polymerization in bulk...
April 23, 2018: Luminescence: the Journal of Biological and Chemical Luminescence
Jordan N Smith, Nigel T Lucas
Container molecules (cavitands) derived from resorcin[4]arene are of broad interest in supramolecular chemistry as hosts and fragments of larger constructs. Herein is presented a new class of rigid cavitand where the resorcin[4]arene carbon framework is extended with four bridging arylene rings. Two tenable, isomeric precursors of differing symmetry (C2v and C4) were prepared, of which only one afforded the desired fused bowl. X-ray crystallographic studies provide conformational insight, and show that the cavitand can bind small molecules in the solid state...
April 23, 2018: Chemical Communications: Chem Comm
P Novodvorsky, A Bernjak, E J Robinson, A Iqbal, I A Macdonald, R M Jacques, J L B Marques, P J Sheridan, S R Heller
AIMS: Hypoglycaemia causes QT-interval prolongation and appears pro-arrhythmogenic. Salbutamol, a β2 -adrenoreceptor agonist also causes QT-interval prolongation. We hypothesized that the magnitude of electrophysiological changes induced by salbutamol and hypoglycaemia might relate to each other and that salbutamol could be used as a non-invasive screening tool for predicting an individual's electrophysiological response to hypoglycaemia. METHODS: Eighteen individuals with Type 1 diabetes were administered 2...
April 23, 2018: Diabetic Medicine: a Journal of the British Diabetic Association
Daniel L Mullendore, Timothy Ross-Elliott, Yan Liu, Hanjo H Hellmann, Eric H Roalson, Winfried S Peters, Michael Knoblauch
Differentiating sieve elements in the phloem of angiosperms produce abundant phloem-specific proteins before their protein synthesis machinery is degraded. These P-proteins initially form dense bodies, which disperse into individual filaments when the sieve element matures. In some cases, however, the dense protein agglomerations remain intact and are visible in functional sieve tubes as non-dispersive P-protein bodies, or NPBs. Species exhibiting NPBs are distributed across the entire angiosperm clade. We found that NPBs in the model tree, Populus trichocarpa , resemble the protein bodies described from other species of the order Malpighiales as they all consist of coaligned tubular fibrils bundled in hexagonal symmetry...
2018: PeerJ
M Deluca, Z G Al-Jlaihawi, K Reichmann, A M T Bell, A Feteira
In situ Raman spectroscopy shows the simultaneous incorporation of small amounts of Bi3+ and Yb3+ into the lattice of BaTiO3 to break the average symmetry inferred from X-ray powder diffraction analysis and permittivity measurements. In particular, Bi3+ with a stereochemically active lone-pair of electrons induces severe lattice strain and the coexistence of different local crystal symmetries over a wide temperature range, effectively controlling the physical properties, such as the temperature dependence of the permittivity and the Curie temperature...
April 7, 2018: Journal of Materials Chemistry. A, Materials for Energy and Sustainability
Sandhya Arvind Gunnal, Mujibuddin S Farooqui, Rajendra N Wabale
Objective: Although posterior communicating artery (PCoA) is a smaller branch of the internal carotid artery, it gives the main contribution in the formation of circle of Willis (CW) by communicating with the internal carotid arterial system and the vertebro-basilar arterial system. The size of PCoA varies frequently. The present work aims to study the PCoA regarding its morphology, morphometry, and symmetry. Materials and Methods: This study was conducted on 170 human cadaveric brains...
April 2018: Asian Journal of Neurosurgery
Yoshi-Ichi Suzuki
The photoelectron asymmetry parameter β, which characterizes the direction of electrons ejected from a randomly oriented molecular ensemble by linearly polarized light, is investigated for degenerate orbitals. We show that β is totally symmetric under the symmetry operation of the point group of a molecule, and it has mixed properties under time reversal. Therefore, all degenerate molecular orbitals, except for the case of degeneracy due to time reversal, have the same β (Wigner-Eckart theorem). The exceptions are e-type complex orbitals of the Cn , Sn , Cnh , T, and Th point groups, and calculations on boric acid (C3h symmetry) are performed as an example...
April 21, 2018: Journal of Chemical Physics
Shuai Yang, Ying Liu
Liquid crystal nematic elastomers are one kind of smart anisotropic and viscoelastic solids simultaneously combing the properties of rubber and liquid crystals, which is thermal sensitivity. In this paper, the wave dispersion in a liquid crystal nematic elastomer porous phononic crystal subjected to an external thermal stimulus is theoretically investigated. Firstly, an energy function is proposed to determine thermo-induced deformation in NE periodic structures. Based on this function, thermo-induced band variation in liquid crystal nematic elastomer porous phononic crystals is investigated in detail...
April 5, 2018: Ultrasonics
John Pickavance, Arianne Azmoodeh, Andrew D Wilson
The stability of coordinated rhythmic movement is primarily affected by the required mean relative phase. In general, symmetrical coordination is more stable than asymmetrical coordination; however, there are two ways to define relative phase and the associated symmetries. The first is in an egocentric frame of reference, with symmetry defined relative to the sagittal plane down the midline of the body. The second is in an allocentric frame of reference, with symmetry defined in terms of the relative direction of motion...
April 18, 2018: Human Movement Science
Pravin G Vanol, Mallika Sanyal, Priyanka A Shah, Pranav S Shrivastav
A highly selective and sensitive liquid chromatography-tandem mass spectrometry (LC MS/MS) method is developed for the quantification of metronidazole (MTZ) in human feces. The analyte was recovered from feces after liquid-liquid extraction with ethyl acetate and separated on Waters Symmetry® C18 (100 × 4.6 mm, 5 μm) column using 0.1 % formic acid in water and acetonitrile (40:60, v/v) as the mobile phase. A stable-deuterated internal standard metronidazole-d4 (MTZ-d4) was used in the study. Mass analysis was performed on a triple quadrupole mass spectrometer in the positive electrospray ionization mode...
April 21, 2018: Biomedical Chromatography: BMC
Thierry Tondu, Wiebren A A Tjalma, Filip E F Thiessen
Reconstructive surgery aims to improve quality of life by recreating a natural-looking breast that is warm to the touch. To obtain symmetry and body contour alignment, restoration of volume within the skin envelope is mandatory. The chosen reconstruction technique depends on the characteristics of the diseased breast, the shape and volume of the contralateral breast, and the technical skills of the surgical team. Timing, type and different possibilities of breast reconstruction are discussed.
April 14, 2018: European Journal of Obstetrics, Gynecology, and Reproductive Biology
Ol'ha O Brovarets', Dmytro M Hovorun
In this Review we have summarized and generalized the results of the investigation of the microstructural mechanisms of the tautomerisation by the counter movement of the protons along the neighboring intermolecular H-bonds in 22 biologically important pairs of nucleotide bases in the framework of the original method, which allows to trace the evolution of the physico-chemical parameters, that characterize these processes along the intrinsic reaction coordinate (IRC). It was demonstrated the performance of the introduction of the conception of the key points (KPs) (from nine to five, depending on the symmetry and nature of system), which exhaustively characterize the flow of the tautomerisation processes...
April 20, 2018: Journal of Biomolecular Structure & Dynamics
Ons Alouini, Dirk Wiechmann
INTRODUCTION: Completely-customized lingual orthodontics is an efficient, predictable and esthetic solution for our patients. Adolescents showing a class II malocclusion represent the majority of patients in orthodontic practices. Several modes of treatment are available to correct this sagittal discrepancy such as inter-maxillary elastics, flexible or rigid protrusion devices, maxillary distalization using mini-screws or symmetric and asymmetric extractions. The choice depends on several decision criteria such as the severity of the malocclusion, the symmetry of the class II discrepancy as well as the age and the motivation of the patient...
March 2018: L' Orthodontie Française
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