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E T Connolly, P Reeves, D Boldrin, A S Wills
Kagome antiferromagnets (KAFMs) have long been known to host exotic electronic states due to their strong geometric frustration, including the quantum spin liquid state in [Formula: see text] systems. Away from that limit, S  =  1 KAFMs are also predicted to host unconventional ground states such as spin nematic phases, but a paucity of studies on known model materials has restricted progress. Here, we present the crystal structure and preliminary magnetization measurements on the newly synthesized S  =  1 KAFM, NH4Ni2...
December 11, 2017: Journal of Physics. Condensed Matter: An Institute of Physics Journal
Adam S Grabell, Theodore J Huppert, Frank A Fishburn, Yanwei Li, Hannah M Jones, Aimee E Wilett, Lisa M Bemis, Susan B Perlman
Individual differences in young children's frustration responses set the stage for myriad developmental outcomes and represent an area of intense empirical interest. Emotion regulation is hypothesized to comprise the interplay of complex behaviors, such as facial expressions, and activation of concurrent underlying neural systems. At present, however, the literature has mostly examined children's observed emotion regulation behaviors and assumed underlying brain activation through separate investigations, resulting in theoretical gaps in our understanding of how children regulate emotion in vivo...
December 11, 2017: Developmental Science
Joseph R Scalea, Lauren Pettinato, Blythe Fiscella, Amanda Bartosic, Allison Piedmonte, Jastine Paran, Niket Todi, Eric J Siskind, Stephen T Bartlett
BACKGROUND: The benefits of pancreas transplantation are often difficult to measure. Here, we sought to determine the difference in quality of life for diabetic patients with and without a functional pancreas transplant alone (PTA). METHODS: PTA cases from 1993-2015 were considered. An IRB-approved survey inclusive of 15 questions spanning 4 domains was employed. Chi-square, Fischer's exact, and the T-test were used where appropriate. RESULTS: 137 PTAs were performed during the study period...
December 11, 2017: Clinical Transplantation
Luis Pinillos, Joseph A Pinto, Gustavo Sarria
Radiotherapy was the first nonsurgical treatment for malignant tumours and represents one of the oldest disciplines of oncology. In Latin America, as in many parts of the world, the history of modern oncology begins with the implementation of radiation therapy facilities. The development of radiotherapy in Latin America was possible thanks to the seminal work of radiation oncologists in different countries. As a large territory, there is a need to implement modern facilities and equipment, but unfortunately there are disparities in the access and quality of radiotherapy services across Latin America and even within individual countries...
2017: Ecancermedicalscience
Eric S Shinwell
Bronchopulmonary Dysplasia (BPD) represents a major threat to the short and long-term health and development of very preterm infants. Unfortunately, despite much study and progress in neonatology in recent years and some modest improvements in survival, both the incidence and severity of BPD remain frustratingly stable (1). This article is protected by copyright. All rights reserved.
December 9, 2017: Acta Paediatrica
Rebecca Girardet, Kelly Bolton, Syed Hashmi, Emily Sedlock, Rachna Khatri, Nina Lahoti, James Lukefahr
Several children's hospitals and medical schools across Texas have child abuse pediatricians (CAPs) who work closely with child protection workers to help ensure accurate assessments of the likelihood of maltreatment in cases of suspected abuse and neglect. Since the state does not mandate which cases should be referred to a CAP center, we were interested in studying factors that may influence workers' decisions to consult a CAP. We used a mixed methods study design consisting of a focus group followed by a survey...
December 6, 2017: Child Abuse & Neglect
Leonor Morgado, Björn M Burmann, Timothy Sharpe, Adam Mazur, Sebastian Hiller
The chaperone Trigger Factor (TF) from Escherichia coli forms a dimer at cellular concentrations. While the monomer structure of TF is well known, the spatial arrangement of this dimeric chaperone storage form has remained unclear. Here, we determine its structure by a combination of high-resolution NMR spectroscopy and biophysical methods. TF forms a symmetric head-to-tail dimer, where the ribosome binding domain is in contact with the substrate binding domain, while the peptidyl-prolyl isomerase domain contributes only slightly to the dimer affinity...
December 8, 2017: Nature Communications
Catherine de Brabois
The question of commitment and its limits can be envisaged from the point of view of supervision in healthcare institutions or in home hospital care. When the commitment appears to be frustrated in the healthcare relationship, it must be supported and its limits should be defined.
December 2017: Soins; la Revue de Référence Infirmière
Zifikile Phindile Shangase, Joyce Mahlako Tsoka-Gwegweni, Catherine O Egbe
BACKGROUND: Drug-resistant tuberculosis (DR-TB) remains a significant cause of morbidity and mortality. The long-term health effects of smoking and the risk of adverse TB outcomes, including increased periods of infectiousness, have been reported among DR-TB patients in South Africa. OBJECTIVES: This study aimed to identify the barriers to smoking cessation among DR-TB inpatients at a hospital in Durban, South Africa. METHODS: A qualitative design using in-depth interviews with a purposive sample of 20 DR-TB inpatients was employed...
May 2017: Annals of Global Health
Antoine Carof, Samuele Giannini, Jochen Blumberger
We have recently introduced an efficient semi-empirical non-adiabatic molecular dynamics method for the simulation of charge transfer/transport in molecules and molecular materials, denoted fragment orbital-based surface hopping (FOB-SH) [J. Spencer et al., J. Chem. Phys. 145, 064102 (2016)]. In this method, the charge carrier wavefunction is expanded in a set of charge localized, diabatic electronic states and propagated in the time-dependent potential due to classical nuclear motion. Here we derive and implement an exact expression for the non-adiabatic coupling vectors between the adiabatic electronic states in terms of nuclear gradients of the diabatic electronic states...
December 7, 2017: Journal of Chemical Physics
Ali Akbar, Muhammad Waleed Khalid, Muhammad Sabieh Anwar
Magnetic linear birefringence and dichroism are investigated for the paramagnetic terbium gallium garnet (TGG) single crystal in the temperature range 8-100 K. The reciprocal nature is confirmed for the linear birefringence. Furthermore a theoretical model is validated that describes the intermixing of linear and circular birefringence. The ellipticity and rotation of the polarization ellipse are investigated in the light of these measurements. These otherwise minuscule magnetically induced effects are amplified at cryogenic temperatures and are determined by a phase-sensitive technique based on the Fourier decomposition of detected signal intensities...
November 27, 2017: Optics Express
Evgeny S Gerasimov, Anna A Gasparyan, Iosif Kaurov, Boris Tichý, Maria D Logacheva, Alexander A Kolesnikov, Julius Lukeš, Vyacheslav Yurchenko, Sara L Zimmer, Pavel Flegontov
RNA editing by targeted insertion and deletion of uridine is crucial to generate translatable mRNAs from the cryptogenes of the mitochondrial genome of kinetoplastids. This type of editing consists of a stepwise cascade of reactions generally proceeding from 3' to 5' on a transcript, resulting in a population of partially edited as well as pre-edited and completely edited molecules for each mitochondrial cryptogene of these protozoans. Often, the number of uridines inserted and deleted exceed the number of nucleotides that are genome-encoded...
December 6, 2017: Nucleic Acids Research
A M Hallas, J Gaudet, N P Butch, Guangyong Xu, M Tachibana, C R Wiebe, G M Luke, B D Gaulin
We report neutron scattering measurements on Er_{2}Pt_{2}O_{7}, a new addition to the XY family of frustrated pyrochlore magnets. Symmetry analysis of our elastic scattering data shows that Er_{2}Pt_{2}O_{7} orders into the k=0, Γ_{7} magnetic structure (the Palmer-Chalker state), at T_{N}=0.38  K. This contrasts with its sister XY pyrochlore antiferromagnets Er_{2}Ti_{2}O_{7} and Er_{2}Ge_{2}O_{7}, both of which order into Γ_{5} magnetic structures at much higher temperatures, T_{N}=1.2 and 1.4 K, respectively...
November 3, 2017: Physical Review Letters
S Petit, E Lhotel, F Damay, P Boutrouille, A Forget, D Colson
Er_{2}Sn_{2}O_{7} remains a puzzling case among the extensively studied frustrated compounds of the rare-earth pyrochlore family. Indeed, while a first-order transition towards a long-range antiferromagnetic state with the so-called Palmer-Chalker structure is theoretically predicted, it has not yet been observed, leaving the issue as to whether it is a spin-liquid candidate open. We report on neutron scattering and magnetization measurements which evidence a second-order transition towards this Palmer-Chalker ordered state around 108 mK...
November 3, 2017: Physical Review Letters
Michael Foss-Feig, Jeremy T Young, Victor V Albert, Alexey V Gorshkov, Mohammad F Maghrebi
Exactly solvable models have played an important role in establishing the sophisticated modern understanding of equilibrium many-body physics. Conversely, the relative scarcity of solutions for nonequilibrium models greatly limits our understanding of systems away from thermal equilibrium. We study a family of nonequilibrium models, some of which can be viewed as dissipative analogues of the transverse-field Ising model, in that an effectively classical Hamiltonian is frustrated by dissipative processes that drive the system toward states that do not commute with the Hamiltonian...
November 10, 2017: Physical Review Letters
Shunsuke Yabunaka, Bertrand Delamotte
We find that the multicritical fixed point structure of the O(N) models is much more complicated than widely believed. In particular, we find new nonperturbative fixed points in three dimensions (d=3) as well as at N=∞. These fixed points come together with an intricate double-valued structure when they are considered as functions of d and N. Many features found for the O(N) models are shared by the O(N)⊗O(2) models relevant to frustrated magnetic systems.
November 10, 2017: Physical Review Letters
Y A Kharkov, O P Sushkov, M Mostovoy
We study topological defects in anisotropic ferromagnets with competing interactions near the Lifshitz point. We show that Skyrmions and bimerons are stable in a large part of the phase diagram. We calculate Skyrmion-Skyrmion and meron-meron interactions and show that Skyrmions attract each other and form ring-shaped bound states in a zero magnetic field. At the Lifshitz point merons carrying a fractional topological charge become deconfined. These results imply that unusual topological excitations may exist in weakly frustrated magnets with conventional crystal lattices...
November 17, 2017: Physical Review Letters
Rebecca L Melen
The end of the metal age: Recent developments in small-molecule activation and chemical transformations of main-group species pose the question as to whether metal catalysts could be avoided altogether in the activation of dinitrogen. A ground-breaking study by Stephan and co-workers clearly implies that the metal-free activation of N2 with frustrated Lewis pairs may be achievable in the not-too-distant future.
December 8, 2017: Angewandte Chemie
Joan Ostaszkiewicz
AIMS AND OBJECTIVES: To describe and critically analyse the thinking that led to the concept of an association between incontinence, care dependence and elder abuse. BACKGROUND: Coercive or abusive continence care practices include chastising a person for their incontinence and overriding their attempts to resist continence care. Neglect in continence care is characterised by withholding or delaying responding to requests for help to maintain continence or to manage incontinence, and restricting a person's access to toileting assistance, incontinence aids or hygiene care...
December 8, 2017: International Journal of Older People Nursing
Brian J Malys, Michelle L Piotrowski, Kevin G Owens
Frustrated by worse than expected error for both peak area and time-of-flight (TOF) in matrix assisted laser desorption ionization (MALDI) experiments using samples prepared by electrospray deposition, it was finally determined that there was a correlation between sample location on the target plate and the measured TOF/peak area. Variations in both TOF and peak area were found to be due to small differences in the initial position of ions formed in the source region of the TOF mass spectrometer. These differences arise largely from misalignment of the instrument sample stage, with a smaller contribution arising from the non-ideal shape of the target plates used...
December 7, 2017: Journal of the American Society for Mass Spectrometry
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