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Juan Olvido Perea García, Tomáš Grenzner, Gabriela Hešková, Panagiotis Mitkidis
The notion that phenomenologically observable differences in the human eye are correlated with behavioral tendencies (other than gaze-following) has been addressed poorly in the psychological literature. Most notably, the proposed correlations are based on an arbitrary categorization in discrete categories of the continuous variability across various traits that could be contributing to individual eye morphologies. We review the relevant literature and assume a view of human eyes as sign stimuli, identifying the relative contrast between the iridal and scleral areas as the main contributor to the strength of the signal...
2017: Communicative & Integrative Biology
Cyril Martins, Markus Aichhorn, Silke Biermann
The interplay of spin-orbit coupling and Coulomb correlations has become a hot topic in condensed matter theory and is especially at stake in 4d and 5d transition metal oxides, like iridates or rhodates. Here, we review recent advances in dynamical mean-field theory(DMFT)-based electronic structure calculations for treating such compounds, introducing all necessary implementation details. We also discuss the evaluation of Hubbard interactions in spin-orbit materials. As an example, we perform DMFT calculations on insulating strontium iridate (Sr<sub>2</sub>IrO<sub>4</sub>) and its 4d metallic counterpart strontium rhodate (Sr<sub>2</sub>RhO<sub>4</sub>)...
March 6, 2017: Journal of Physics. Condensed Matter: An Institute of Physics Journal
Satoshi Okamoto, John Nichols, Changhee Sohn, So Yeun Kim, Tae Won Noh, Ho Nyung Lee
Charge transfer in superlattices consisting of SrIrO3 and SrMnO3 is investigated using density functional theory. Despite the nearly identical work function and nonpolar interfaces between SrIrO3 and SrMnO3, rather large charge transfer was experimentally reported at the interface between them. Here, we report a microscopic model that captures the mechanism behind this phenomenon, providing a qualitative understanding of the experimental observation. This leads to unique strain dependence of such charge transfer in iridate-manganite superlattices...
March 7, 2017: Nano Letters
Alexander J LoPinto, Chris G Pirie, Sandra L Ayres, Daniela Bedenice
OBJECTIVE To compare results of anterior segment angiography of ophthalmically normal eyes of goats, sheep, and alpacas performed by use of indocyanine green (ICG) and sodium fluorescein (SF). ANIMALS 10 female goats (mean ± SD age, 6.8 ± 1.7 years), 10 female sheep (3.0 ± 2.2 years), and 10 alpacas (7 females and 3 males; 6.8 ± 3.8 years). PROCEDURES A catheter was aseptically placed into a jugular vein. Each animal was anesthetized and properly positioned, and 0.25% ICG was administered. Images were obtained by use of an adaptor system consisting of a modified digital single-lens reflex camera, camera adaptor, and camera lens...
March 2017: American Journal of Veterinary Research
Xingye Lu, D E McNally, M Moretti Sala, J Terzic, M H Upton, D Casa, G Ingold, G Cao, T Schmitt
We use resonant elastic and inelastic x-ray scattering at the Ir-L_{3} edge to study the doping-dependent magnetic order, magnetic excitations, and spin-orbit excitons in the electron-doped bilayer iridate (Sr_{1-x}La_{x})_{3}Ir_{2}O_{7} (0≤x≤0.065). With increasing doping x, the three-dimensional long range antiferromagnetic order is gradually suppressed and evolves into a three-dimensional short range order across the insulator-to-metal transition from x=0 to 0.05, followed by a transition to two-dimensional short range order between x=0...
January 13, 2017: Physical Review Letters
Hongbin Zhang, Kristjan Haule, David Vanderbilt
Combining density functional theory (DFT) and embedded dynamical mean-field theory (DMFT) methods, we study the metal-insulator transition in R_{2}Ir_{2}O_{7} (R=Y, Eu, Sm, Nd, Pr, and Bi) and the topological nature of the insulating compounds. Accurate free energies evaluated using the charge self-consistent DFT+DMFT method reveal that the metal-insulator transition occurs for an A-cation radius between that of Nd and Pr, in agreement with experiments. The all-in-all-out magnetic phase, which is stable in the Nd compound but not the Pr one, gives rise to a small Ir^{4+} magnetic moment of ≈0...
January 13, 2017: Physical Review Letters
H Chu, L Zhao, A de la Torre, T Hogan, S D Wilson, D Hsieh
Layered perovskite iridates realize a rare class of Mott insulators that are predicted to be strongly spin-orbit coupled analogues of the parent state of cuprate high-temperature superconductors. Recent discoveries of pseudogap, magnetic multipolar ordered and possible d-wave superconducting phases in doped Sr2IrO4 have reinforced this analogy among the single layer variants. However, unlike the bilayer cuprates, no electronic instabilities have been reported in the doped bilayer iridate Sr3Ir2O7. Here we show that Sr3Ir2O7 realizes a weak Mott state with no cuprate analogue by using ultrafast time-resolved optical reflectivity to uncover an intimate connection between its insulating gap and antiferromagnetism...
January 16, 2017: Nature Materials
Chun-Lei Zhang, Zhi-You Hao, Yan-Fei Liu, Yan Wang, Guo-Ru Shi, Zhi-Bo Jiang, Ruo-Yun Chen, Zheng-Yu Cao, De-Quan Yu
Six new iridal-type triterpenoids containing an unprecedented cyclopentane ring, polycycloiridals E-J (1-6), were isolated from a large-scale re-extraction of Iris tectorum. A possible biosynthesis pathway is postulated. The known spirioiridotectal D (7) was also obtained in the current investigation, and its structure was unequivocally defined using X-ray diffraction data. Compound 7 suppressed LPS-activated NO production in the BV2 cell line with an IC50 value of 0.54 μM.
January 27, 2017: Journal of Natural Products
Sarah Larney, Amy Peacock, Bradley M Mathers, Matthew Hickman, Louisa Degenhardt
BACKGROUND: Non-viral injecting-related injuries and diseases (IRID), such as abscesses and vascular damage, can result in significant morbidity and mortality if untreated. There has been no systematic assessment of the prevalence of non-viral IRID among people who inject drugs; this review aimed to address this gap, as well as identify risk factors for experience of specific IRID. METHODS: We searched MEDLINE, Embase and CINAHL databases to identify studies on the prevalence of, or risk factors for, IRID directly linked to injecting in samples of people who inject illicit drugs...
December 8, 2016: Drug and Alcohol Dependence
S V Saakyan, E B Myakoshina
This is a case report of rare iridal involvement in intraocular lymphoma confirmed by the full range of diagnostic measures, including ultrasound biomicroscopy, optical coherence tomography of the anterior segment of the eye, iridectomy with biopsy and further cytological and histopathological examination of the obtained material.
2016: Vestnik Oftalmologii
Wei Sun, Ji-Yuan Liu, Xue-Qing Gong, Waqas-Qamar Zaman, Li-Mei Cao, Ji Yang
The anodic reaction of oxygen evolution reaction (OER), an important point for electrolysis, however, remains the obstacle due to its complicated reaction at electrochemical interfaces. Iridium oxide (IrO2) is the only currently known 5d transition metal oxide possessing admirable OER activity. Tremendous efforts have been carried out to enhance the activity of iridium oxides. Unfortunately there lies a gap in understanding what factors responsible for the activity in doped IrO2 or the novel crystal structure...
December 2, 2016: Scientific Reports
Antonio Alfonzo, Claudia Miceli, Anna Nasca, Elena Franciosi, Giusi Ventimiglia, Rosalia Di Gerlando, Kieran Tuohy, Nicola Francesca, Giancarlo Moschetti, Luca Settanni
The present work was carried out to retrieve the origin of lactic acid bacteria (LAB) in sourdough. To this purpose, wheat LAB were monitored from ear harvest until the first step of fermentation for sourdough development. The influence of the geographical area and variety on LAB species/strain composition was also determined. The ears of four Triticum durum varieties (Duilio, Iride, Saragolla and Simeto) were collected from several fields located within the Palermo province (Sicily, Italy) and microbiologically investigated...
April 2017: Food Microbiology
Fenghe Liang, Min Zhao, Lynn Fan, Hongyan Zhang, Yang Shi, Rui Han, Chunyan Qu
OBJECTIVES: Waardenburg syndrome is a rare genetic disorder, characterized by the association of sensorineural hearing loss and pigmentation abnormalities. Four subtypes have been classified. The present study aimed to analyze the clinical feature and investigate the genetic cause for a Chinese case of Waardenburg type IV (WS4). METHODS: The patient and his family members were subjected to mutation detection in the candidate gene SOX10 by Sanger sequencing. RESULTS: The patient has the clinical features of WS4, including sensorineural hearing loss, bright blue irides, premature graying of the hair and Hirschsprung disease...
December 2016: International Journal of Pediatric Otorhinolaryngology
Alison H Skalet, Yan Li, Chen D Lu, Yali Jia, ByungKun Lee, Lennart Husvogt, Andreas Maier, James G Fujimoto, Charles R Thomas, David Huang
PURPOSE: To evaluate tumor vasculature with optical coherence tomography angiography (OCTA) in malignant iris melanomas and benign iris lesions. DESIGN: Cross-sectional observational clinical study. PARTICIPANTS: Patients with iris lesions and healthy volunteers. METHODS: Eyes were imaged using OCTA systems operating at 1050- and 840-nm wavelengths. Three-dimensional OCTA scans were acquired. Iris melanoma patients treated with radiation therapy were imaged again after I-125 plaque brachytherapy at 6 and 18 months...
February 2017: Ophthalmology
T Kalezic, I Vukovic, M Andjelkovic, M Gajic, J Potic, M Stojkovic
PURPOSE: Whether cycloplegics affect standard keratorefractometric and tomographic measurements is unknown. The purpose of our study was to compare the effects of cycloplegics (cyclopentolate and atropine) on corneal shape and refractive power of the eye. METHODS: This study was performed on 84 eyes of 49 study participants. Patients were randomized into two groups: atropine 1% (32 eyes) and cyclopentolate 1% (52 eyes). Corneal tomography was performed with the Orbscan IIz...
December 2016: Journal Français D'ophtalmologie
Q Cui, J-G Cheng, W Fan, A E Taylor, S Calder, M A McGuire, J-Q Yan, D Meyers, X Li, Y Q Cai, Y Y Jiao, Y Choi, D Haskel, H Gotou, Y Uwatoko, J Chakhalian, A D Christianson, S Yunoki, J B Goodenough, J-S Zhou
The perovskite SrIrO_{3} is an exotic narrow-band metal owing to a confluence of the strengths of the spin-orbit coupling (SOC) and the electron-electron correlations. It has been proposed that topological and magnetic insulating phases can be achieved by tuning the SOC, Hubbard interactions, and/or lattice symmetry. Here, we report that the substitution of nonmagnetic, isovalent Sn^{4+} for Ir^{4+} in the SrIr_{1-x}Sn_{x}O_{3} perovskites synthesized under high pressure leads to a metal-insulator transition to an antiferromagnetic (AF) phase at T_{N}≥225  K...
October 21, 2016: Physical Review Letters
Carlos Córdova-Fletes, Horacio Rivera, Eduardo A Garza-Villarreal, Norma A Vázquéz-Cárdenas, Lizeth A Martínez-Jacobo, Talia Moreno-Andrade
No abstract text is available yet for this article.
January 2017: Clinical Dysmorphology
H Gretarsson, N H Sung, J Porras, J Bertinshaw, C Dietl, Jan A N Bruin, A F Bangura, Y K Kim, R Dinnebier, Jungho Kim, A Al-Zein, M Moretti Sala, M Krisch, M Le Tacon, B Keimer, B J Kim
We have studied the magnetic excitations of electron-doped Sr_{2-x}La_{x}IrO_{4} (0≤x≤0.10) using resonant inelastic x-ray scattering at the Ir L_{3} edge. The long-range magnetic order is rapidly lost with increasing x, but two-dimensional short-range order (SRO) and dispersive magnon excitations with nearly undiminished spectral weight persist well into the metallic part of the phase diagram. The magnons in the SRO phase are heavily damped and exhibit anisotropic softening. Their dispersions are well described by a pseudospin-1/2 Heisenberg model with exchange interactions whose spatial range increases with doping...
September 2, 2016: Physical Review Letters
Vianney Cortés-González, Juan Carlos Zenteno, Martín Guzmán-Sánchez, Verónica Giordano-Herrera, Dalia Guadarrama-Vallejo, Narlly Ruíz-Quintero, Cristina Villanueva-Mendoza
Tietz syndrome and Waardenburg syndrome type 2A are allelic conditions caused by MITF mutations. Tietz syndrome is inherited in an autosomal dominant pattern and is characterized by congenital deafness and generalized skin, hair, and eye hypopigmentation, while Waardenburg syndrome type 2A typically includes variable degrees of sensorineural hearing loss and patches of de-pigmented skin, hair, and irides. In this paper, we report two unrelated families with MITF mutations. The first family showed an autosomal dominant pattern and variable expressivity...
September 8, 2016: American Journal of Medical Genetics. Part A
John Nichols, Xiang Gao, Shinbuhm Lee, Tricia L Meyer, John W Freeland, Valeria Lauter, Di Yi, Jian Liu, Daniel Haskel, Jonathan R Petrie, Er-Jia Guo, Andreas Herklotz, Dongkyu Lee, Thomas Z Ward, Gyula Eres, Michael R Fitzsimmons, Ho Nyung Lee
Strong Coulomb repulsion and spin-orbit coupling are known to give rise to exotic physical phenomena in transition metal oxides. Initial attempts to investigate systems, where both of these fundamental interactions are comparably strong, such as 3d and 5d complex oxide superlattices, have revealed properties that only slightly differ from the bulk ones of the constituent materials. Here we observe that the interfacial coupling between the 3d antiferromagnetic insulator SrMnO3 and the 5d paramagnetic metal SrIrO3 is enormously strong, yielding an anomalous Hall response as the result of charge transfer driven interfacial ferromagnetism...
2016: Nature Communications
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