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Shiqing Deng, Shaobo Cheng, Changsong Xu, Binghui Ge, Xuefeng Sun, Rong Yu, Wenhui Duan, Jing Zhu
The broken symmetry along with anomalous defect structures and charging conditions at multiferroics surface can alter both crystal structures and electronic configurations, bringing in emergent physical properties. Extraordinary surface states are induced into original mutually-coupled order parameters in such strongly correlated oxides, which flourish in diverse properties, however remain less explored. Here, we report the peculiar surface ferroelectric states and reconfigurable functionalities driven by the relaxation of surface and consequent changes in O-2p and Y-4d orbital (p-d) hybridization within a representative hexagonal multiferroics YMnO3...
July 21, 2017: ACS Applied Materials & Interfaces
Maria E Florian-Rodriguez, Jennifer Hamner, Marlene M Corton
BACKGROUND: The recommended location of graft attachment during sacrocolpopexy is at or below the sacral promontory on the anterior surface of the first sacral vertebra. Graft fixation below the sacral promontory may potentially involve the first sacral nerve. OBJECTIVES: The objectives of this study were to examine the anatomy of the right first sacral nerve relative to the midpoint of the sacral promontory and to evaluate the thickness and ultrastructural composition of the anterior longitudinal ligament at the sacral promontory level...
July 11, 2017: American Journal of Obstetrics and Gynecology
Arunkumar Bupathy, Varsha Banerjee, Sanjay Puri
Magnetic and dielectric solids are well-represented by the Ising model with dipolar interactions (IM+DI). The latter are long-ranged, fluctuating in sign, and anisotropic. Equilibrium studies have revealed novel consequences of these complicated interactions, but their effect on nonequilibrium behavior is not explored. We perform a deep temperature quench to study the kinetics of domain growth in the d=3 IM+DI. Our main observations are (i) the emergence of columnar domains along the z axis (Ising axis) with a transient periodicity in the xy plane; (ii) anisotropic growth laws: ℓ_{ρ}(t)∼t^{ϕ}; ℓ_{z}(t)∼t^{ψ}, where ρ[over ⃗]=(x,y) and ℓ is the characteristic length scale; (iii) generalized dynamical scaling for the correlation function: C(ρ,z;t)=g(ρ/ℓ_{ρ},z/ℓ_{z}); and (iv) an asymptotic Porod tail in the corresponding structure factor: S(k_{ρ},0;t)∼k_{ρ}^{-3}; S(0,k_{z};t)∼k_{z}^{-2}...
June 2017: Physical Review. E
Federica Aprigliano, Dario Martelli, Peppino Tropea, Guido Pasquini, Silvestro Micera, Vito Monaco
This study was aimed at verifying whether ageing modifies intralimb coordination strategy during corrective responses elicited by unexpected slip-like perturbations delivered during steady walking on a treadmill. To this end, ten young and ten elderly subjects were asked to manage unexpected slippages of different intensities. We analyzed the planar covariation law of the lower limb segments, using the principal component analysis, in order to verify whether elevation angles of older subjects covaried along a plane, before and after the perturbation...
July 12, 2017: Journal of Neurophysiology
P Rowghanian, O Campàs
Many cell behaviors involve cell-shape transformations that impose considerable changes in the cell's surface area, requiring a constant adaptation of the cell's plasma membrane area to prevent cell lysis. Here, we theoretically describe the interplay between the plasma membrane dynamics and a physically connected cell cortex or wall, accounting for spatial variations in membrane recycling and tension. In-plane membrane net flows result naturally from these dynamics and, in the presence of an expanding cell cortex or wall, regions of converging or diverging flow patterns emerge...
July 11, 2017: Biophysical Journal
Chih-Shan Tan, Michael Hsuan-Yi Huang
Density functional theory calculations have been performed on Si (100), (110), (111), and (112) planes with tunable number of planes for evaluation of their band structures and density of states profiles. The purpose is to see whether silicon can exhibit facet-dependent properties derived from the presence of a thin surface layer having different band structures. No changes have been observed for single to multiple layers of Si (100) and (110) planes with a consistent band gap between the valence band and the conduction band...
July 11, 2017: Chemistry: a European Journal
Feray Bakan, Goknur Kara, Melike Cokol Cakmak, Murat Cokol, Emir Baki Denkbas
Small interfering RNAs (siRNA) are short nucleic acid fragments of about 20-27 nucleotides, which can inhibit the expression of specific genes. siRNA based RNAi technology has emerged as a promising method for the treatment of a variety of diseases. However, a major limitation in the therapeutic use of siRNA is its rapid degradation in plasma and cellular cytoplasm, resulting in short half-life. In addition, as siRNA molecules cannot penetrate into the cell efficiently, it is required to use a carrier system for its delivery...
June 27, 2017: Colloids and Surfaces. B, Biointerfaces
M A Corvetto, J C Pedemonte, D Varas, C Fuentes, F R Altermatt
BACKGROUND: Current evidence supports the utility of simulation training for bedside procedures such as ultrasound-guided jugular central venous catheter (CVC) insertion. However, a standardized methodology to teach procedural skills has not been determined yet. The aim of this study was to evaluate the effectiveness of a simulation-based training program for improving novice technical performance during ultrasound-guided internal jugular CVC placement. METHODS: Postgraduate year 1 (PGY-1) residents from anesthesiology, emergency medicine, cardiology, ICU, and nephrology specialties were trained in four deliberate practice sessions...
July 6, 2017: Acta Anaesthesiologica Scandinavica
Arun Nissimagoudar, Jinlong Ma, Yani Chen, Wu Li
Two-dimensional InSe, a recently synthesized semiconductor having a moderate band gap, has gained attention due to its ultra high mobility and high photo-responsivity. In this work, we calculate the lattice thermal conductivity (κ) of monolayer InSe by solving the phonon Boltzmann transport equation (BTE) with first-principles calculated inter atomic force constants. κ of monolayer InSe is isotropic and found to be around 27.6 W/m-K at room temperature along the in-plane direction. The size dependence of κ shows the size effect can persist up-to 20 μm...
June 23, 2017: Journal of Physics. Condensed Matter: An Institute of Physics Journal
Minhua Zheng, Junjun Ma
Since the emergence of minimally invasive technology twenty years ago, as a surgical concept and surgical technique for colorectal cancer surgery, its obvious advantages have been recognized. Laparoscopic technology, as one of the most important technology platform, has got a lot of evidence-based support for the oncological safety and effectiveness in colorectal cancer surgery Laparoscopic technique has advantages in terms of identification of anatomic plane and autonomic nerve, protection of pelvic structure, and fine dissection of vessels...
June 25, 2017: Zhonghua Wei Chang Wai Ke za Zhi, Chinese Journal of Gastrointestinal Surgery
Naohiro Takemura, Toshio Inui, Takao Fukui
Pointing is one of the communicative actions that infants acquire during their first year of life. Based on a hypothesis that early pointing is triggered by emergent reaching behavior toward objects placed at out-of-reach distances, we proposed a neural network model that acquires reaching without explicit representation of 'targets'. The proposed model controls a two-joint arm in a horizontal plane, and it learns a loop of internal forward and inverse transformations; the former predicts the visual feedback of hand position and the latter generates motor commands from the visual input through random generation of the motor commands...
June 20, 2017: Developmental Science
Harald Ittrich, Maximilian Bockhorn, Hans Klose, Marcel Simon
BACKGROUND: Hemoptysis, i.e., the expectoration of blood from the lower airways, has an annual incidence of approximately 0.1% in ambulatory patients and 0.2% in inpatients. It is a potentially life-threatening medical emergency and carries a high mortality. METHODS: This review article is based on pertinent publications retrieved by a selective search in PubMed. RESULTS: Hemoptysis can be a sign of many different diseases. Its cause remains unknown in about half of all cases...
June 5, 2017: Deutsches Ärzteblatt International
Paolo Luchini
For nearly a century, the universal logarithmic law of the mean velocity profile has been a mainstay of turbulent fluid mechanics and its teaching. Yet many experiments and numerical simulations are not fit exceedingly well by it, and the question whether the logarithmic law is indeed universal keeps turning up in discussion and in writing. Large experiments have been set up in various parts of the world to confirm or deny the logarithmic law and accurately estimate von Kármán's constant, the coefficient that governs it...
June 2, 2017: Physical Review Letters
Baris Baykant Alagoz
With power mapping (conformal mapping), stability analyses of fractional order linear time invariant (LTI) systems are carried out by consideration of the root locus of expanded degree integer order polynomials in the principal Riemann sheet. However, it is essential to show the left half plane (LHP) stability analysis of fractional order characteristic polynomials in the s plane in order to close the gap emerging in stability analyses of fractional order and integer order systems. In this study, after briefly discussing the relation between the characteristic root orientations and the system stability, the author presents a methodology to establish principal characteristic polynomials to perform the LHP stability analysis of fractional order systems...
June 9, 2017: ISA Transactions
Maria A Palacios, Joscha Nehrkorn, Elizaveta A Suturina, Eliseo Ruiz, Silvia Gomez-Coca, Karsten Holldack, Alexander Schnegg, J Krzystek, Jose M Moreno, Enrique Colacio
Three new closely related CoIIYIII complexes of general formula [Co(-L)(-X)Y(NO3)2] (X- = NO3- 1, benzoate, 2 and 9-anthracenecarboxylato, 3) have been prepared with the compartmental ligand N,N',N"-trimethyl-N,N"-bis(2-hydroxy-3-methoxy-5-methylbenzyl)diethylenetriamine (H2L). In these complexes CoII and YIII are triply bridged by two phenoxide groups belonging to the dideprotonated ligand (L2-) and one ancillary anion X-. The change of the ancillary bridging group connecting CoII and YIII ions induces small differences in the trigonally distorted CoN3O3 coordination sphere with a concomitant tuning of the magnetic anisotropy and intermolecular interactions...
June 12, 2017: Chemistry: a European Journal
Sam Khamis, Eli Carmeli
Controversy still exists as to the clinical significance of leg length discrepancy (LLD) in spite of the fact that further evidence has been emerging regarding the relationship between several clinical conditions and LLD. The objectives of our study were to review the available research with regard to LLD as a cause of clinically significant gait deviations, to determine if there is a relationship between the magnitude of LLD and the presence of gait deviations and to identify the most common gait deviations associated with LLD...
May 31, 2017: Gait & Posture
Ricardo B Fontes, Richard G Fessler
Surgery for adult spinal deformity (ASD) has emerged as an efficient treatment alternative, but it is fraught with potential perioperative morbidity, incompletely mitigated by emerging minimally invasive surgical techniques. In mild-to-moderate ASD balanced in the sagittal plane, there are situations in which the counterintuitive simple decompression through a foraminotomy or laminectomy, or even a short-segment fusion may be an attractive treatment. This article presents a case example and the authors' treatment rationale and reviews the limited available literature supporting it...
July 2017: Neurosurgery Clinics of North America
Ann Peters, Noah B Rindos, Richard S Guido, Nicole M Donnellan
To demonstrate surgical techniques utilized during uterine-sparing laparoscopic resections of accessory cavitated uterine masses (ACUM) BACKGROUND: ACUM represent a rare uterine entity observed in premenopausal women suffering from dysmenorrhea and recurrent pelvic pain. The diagnosis is made when an isolated extra-cavitated uterine mass is resected from an otherwise normal appearing uterus with unremarkable endometrial lumen and adnexal structures. Pathologic confirmation requires an accessory cavity lined with endometrial epithelium (and corresponding glands and stroma) filled with chocolate-brown fluid...
June 6, 2017: Journal of Minimally Invasive Gynecology
Hongmei Xiao, Lishuang Ma, Weihai Fang, Xuebo Chen
Utilization of photoinitiated isomerization reaction has recently emerged as a very promising platform to modulate the basicity of compounds; however, theoretical insight into its regulatory mechanism remains largely unknown and needs to be addressed. For the first time, an unexpected trans-cis photoisomerization via the N═N out of plane (NOOP) motion triggered by an in-plane inversion of N-N═N moiety was computationally demonstrated to regulate the pOH jump of water-solvated triazabutadiene by using the multiconfigurational perturbation theory together with the calculation of rate constants of protonation-deprotonation reactions...
June 21, 2017: Journal of Physical Chemistry. A
Chandra Chowdhury, Ayan Datta
Phosphorene, the monolayer form of black phosphorus, is the most recent addition to graphene-like van der Waals two-dimensional (2D) systems. Due to its several interesting properties, namely its tunable direct band gap, high carrier mobility, and unique in-plane anisotropy, it has emerged as a promising candidate for electronic and optoelectronic devices. Phosphorene (Pn) reveals a much richer phase diagram than graphene, and it comprises the two forms namely the stapler-clip like (black Pn, α form) and chairlike (blue Pn, β form) structures...
June 14, 2017: Journal of Physical Chemistry Letters
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