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Min Hee Suh, Linda M Zangwill, Patricia Isabel C Manalastas, Akram Belghith, Adeleh Yarmohammadi, Felipe A Medeiros, Alberto Diniz-Filho, Luke J Saunders, Robert N Weinreb
PURPOSE: To investigate factors associated with dropout of the parapapillary deep retinal layer microvasculature assessed by optical coherence tomography angiography (OCTA) in glaucomatous eyes. DESIGN: Cross-sectional study. PARTICIPANTS: Seventy-one eyes from 71 primary open-angle glaucoma (POAG) patients with β-zone parapapillary atrophy (βPPA) enrolled in the Diagnostic Innovations in Glaucoma Study. METHODS: Parapapillary deep-layer microvasculature dropout was defined as a complete loss of the microvasculature located within the deep retinal layer of the βPPA from OCTA-derived optic nerve head vessel density maps by standardized qualitative assessment...
October 18, 2016: Ophthalmology
Jessica Lee, Richard Rosen
Diabetic retinopathy is a progressive microvascular disease that leads to increased vessel permeability, retinal ischemia, and retinal neovascularization. Optical coherence tomography angiography (OCTA) is a novel angiography technique that has the capability to advance our understanding of diabetic eye disease by providing high-resolution images of retinal and choroidal microvasculature blood flow and structure. Using OCTA, the vascular changes of diabetic retinopathy including microaneurysms, retinal non-perfusion, intraretinal microvascular abnormalities, and neovascularization can be clearly visualized...
December 2016: Current Diabetes Reports
Rohan Chawla, Kanhaiya Mittal, Rajpal Vohra
The authors report the use of optical coherence tomography angiography (OCTA) (DRI OCT Triton; Topcon, Tokyo, Japan) to localize, characterize, and confirm the presence of a choroidal neovascular membrane in a patient of focal choroidal excavation (FCE) with recent-onset metamorphopsia and visual blurring. En face OCTA images just above the level of the retinal pigment epithelium-Bruch's membrane complex typically showed the presence of a glomerulus-like neovascular network with an adjacent dark area suggestive of a Type 2 choroidal neovascularization (CNV)...
October 1, 2016: Ophthalmic Surgery, Lasers & Imaging Retina
Ricardo Noguera Louzada, Daniela Ferrara, Eduardo Amorim Novais, Eric Moult, Emily Cole, Mark Lane, James Fujimoto, Jay S Duker, Caroline R Baumal
To describe the appearance of a scleral-derived feeder vessel in a highly myopic eye with secondary choroidal neovascularization (CNV) as visualized on both en face high-speed swept-source (SS) optical coherence tomography angiography (OCTA) prototype, and a commercially available spectral-domain (SD) OCTA, with the corresponding en face and cross-sectional structural OCT images. In this case report, a 60-year-old white male presented with high myopia and secondary CNV in the right eye, previously treated with anti-vascular endothelial growth factor, and was imaged on both SD-OCT and SS-OCT...
October 1, 2016: Ophthalmic Surgery, Lasers & Imaging Retina
Stefan J Lang, Bertan Cakir, Charlotte Evers, Franziska Ludwig, Clemens A K Lange, Hansjürgen T Agostini
BACKGROUND AND OBJECTIVE: The introduction of optical coherence tomography angiography (OCTA) provides new insights into the retinal vasculature. The aim of this study was to explore the value of OCTA in imaging retinal hemangioblastomas and monitoring laser treatment in patients with von Hippel-Lindau (VHL) disease. PATIENTS AND METHODS: Ten eyes of 10 patients with VHL disease were included in this retrospective case series. All patients underwent complete ophthalmological work-up including OCTA for retinal and optic nerve head hemangioblastoma...
October 1, 2016: Ophthalmic Surgery, Lasers & Imaging Retina
Jeanne Crassous, Chengshuo Shen, Monika Srebro-Hooper, Marion Jean, Nicolas Vanthuyne, Gilles Muller, Loïc Toupet, J A Gareth Williams, Jochen Autschbach, Alexis Torres, Adrian Riives
Four members of a new class of cycloborylated hexa- to deca-helicenes (1a-d) have been prepared in enantiopure forms, along with cycloplatinated deca-helicenes (1d', 1d1) further extending a family of cycloplatinated hexa- to octa-helicenes reported previously. The azabora[n]helicenes display intense electronic circular dichroism and strong optical rotations, whose dependence on the size of the helix (n = 6, 8, or 10) and number of boron atoms (1 or 2) has been examined in detail both experimentally and theoretically...
October 18, 2016: Chemistry: a European Journal
Marcus Ang, Yijun Cai, Anna C S Tan
Purpose. To describe a novel technique of adapting a swept-source optical coherence tomography angiography (OCTA) to image corneal vascularization. Methods. In this pilot cross-sectional study, we obtained 3 × 3 mm scans, where 100,000 A-scans are acquired per second with optical axial resolution of 8 μm and lateral resolution of 20 μm. This was performed with manual "XYZ" focus without the anterior segment lens, until the focus of the corneoscleral surface was clearly seen and the vessels of interest were in focus on the corresponding red-free image...
2016: Journal of Ophthalmology
Eric M Moult, Nadia K Waheed, Eduardo A Novais, WooJhon Choi, ByungKun Lee, Stefan B Ploner, Emily D Cole, Ricardo N Louzada, Chen D Lu, Philip J Rosenfeld, Jay S Duker, James G Fujimoto
PURPOSE: To investigate choriocapillaris (CC) alteration in patients with nascent geographic atrophy (nGA) and/or drusen-associated geographic atrophy (DAGA) using swept-source optical coherence tomography angiography (OCTA). METHODS: A 1,050-nm wavelength, 400 kHz A-scan rate swept-source optical coherence tomography prototype was used to perform volumetric swept-source optical coherence tomography angiography over 6 mm × 6 mm fields of view in patients with nGA and/or DAGA...
September 30, 2016: Retina
Anna C S Tan, Kunal K Dansingani, Lawrence A Yannuzzi, David Sarraf, K Bailey Freund
PURPOSE: To study the cross-sectional and en face optical coherence tomography angiography (OCTA) findings in Type 3 neovascularization (NV). METHODS: Optical coherence tomography angiography imaging of 27 eyes of 23 patients with Type 3 NV was analyzed with 9 eyes having consecutive follow-up OCTA studies. RESULTS: Type 3 NV appeared as a linear high-flow structure on cross-sectional OCTA corresponding to a high-flow tuft of vessels seen on en face OCTA...
October 5, 2016: Retina
Stefan Suckert, Inke Jess, Christian Näther
The asymmetric unit of the title compound, [Ni(NCS)2(C5H4ClN)2(H2O)2], consists of one nickel(II) cation that is located on a center of inversion and one thio-cyanate anion, one water mol-ecule and one 2-chloro-pyridine ligand all occupying general positions. The Ni(II) cation is octa-hedrally coordinated by two terminal N-bound thio-cyanato ligands, two aqua ligands and two N-bound 2-chloro-pyridine ligands into discrete complexes. Individual complexes are linked by inter-molecular O-H⋯S and O-H⋯Cl hydrogen-bonding inter-actions into a layered network extending parallel to the bc plane...
October 1, 2016: Acta Crystallographica. Section E, Crystallographic Communications
Fatima Setifi, Dohyun Moon, Robeyns Koen, Zouaoui Setifi, Morad Lamsayah, Rachid Touzani
The search for new mol-ecular materials with inter-esting magnetic properties using the pseudohalide azide ion and quinolin-8-amine (aqin, C9H8N2) as a chelating ligand, led to the synthesis and structure determination of the title complex, [Fe(N3)2(C9H8N2)2]. The complex shows an octa-hedral geometry, with the Fe(II) atom surrounded by six N atoms; the two N3(-) anions coordinate in a cis configuration, while the remaining N atoms originate from the two quinolin-8-amine ligands with the quinoline N atoms lying on opposite sides of the Fe atom...
October 1, 2016: Acta Crystallographica. Section E, Crystallographic Communications
A Dominic Fortes, Christopher M Howard, Ian G Wood, Matthias J Gutmann
Single crystals of glycine zinc sulfate penta-hydrate [systematic name: hexa-aqua-zinc tetra-aquadiglycinezinc bis-(sulfate)], [Zn(H2O)6][Zn(C2H5NO2)2(H2O)4](SO4)2, have been grown by isothermal evaporation from aqueous solution at room temperature and characterized by single-crystal neutron diffraction. The unit cell contains two unique ZnO6 octa-hedra on sites of symmetry -1 and two SO4 tetra-hedra with site symmetry 1; the octa-hedra comprise one [tetra-aqua-diglycine zinc](2+) ion (centred on one Zn atom) and one [hexa-aqua-zinc](2+) ion (centred on the other Zn atom); the glycine zwitterion, NH3(+)CH2COO(-), adopts a monodentate coordination to the first Zn atom...
October 1, 2016: Acta Crystallographica. Section E, Crystallographic Communications
Nicolas Massoni, Pierrick Chevreux
The structure of triclinic disodium hafnium disilicate, Na2HfSi2O7, has been determined by laboratory powder X-ray diffraction and refined by the Rietveld refinement. The structure is a framework made of alternate layers of HfO6 octa-hedra and SiO4 tetra-hedra linked by common O atoms. Sodium atoms are located in the voids of the framework, aligned into tunnels along the [010] direction. Na2HfSi2O7 is isostructural with the parakeldyshite Na2ZrSi2O7 phase.
October 1, 2016: Acta Crystallographica. Section E, Crystallographic Communications
Dmitry S Poplevin, Fedor I Zubkov, Pavel V Dorovatovskii, Yan V Zubavichus, Victor N Khrustalev
The isomeric title compounds, C12H13NO4 (Ia) and C12H13NO4 (IIa), the products of an usual thermal C6-epimerization of 5-oxo-1,2,3,5,5a,6,7,9b-octa-hydro-7,9a-ep-oxy-pyrrolo-[2,1-a]iso-indole-6-carb-oxy-lic acid, represent the two different diastereomers and have very similar mol-ecular geometries. The mol-ecules of both compounds comprise a fused tetra-cyclic system containing four five-membered rings (pyrrolidine, pyrrolidinone, di-hydro-furan and tetra-hydro-furan), all of which adopt the usual envelope conformations...
October 1, 2016: Acta Crystallographica. Section E, Crystallographic Communications
Yang Liu, Hai-Hui Liu
In the polymeric title compound, [CdCl2(C6H6N4)] n , the central Cd(II) atom is coordinated by four chloride ligands and two N atoms from a chelating 2,2'-bi-1H-imidazole mol-ecule, leading to a distorted octa-hedral Cl4N2 coordination set. As a result of the μ2-bridging character of the Cl ligands, chains parallel to the c axis are formed, with the chelating 2,2'-bi-1H-imidazole ligands decorated on both sides of the chain. The luminescence properties of the complex dispersed in di-methyl-formamide shows that the emission intensities are significantly quenched by nitro-benzene...
October 1, 2016: Acta Crystallographica. Section E, Crystallographic Communications
Dohyun Moon, Jong-Ha Choi
In the asymmetric unit of the title compound, [CrCl2(C10H24N4)][Cr(C2O4)(C10H24N4)](ClO4)2 (C10H24N4 = 1,4,8,11-tetra-aza-cyclo-tetra-decane, cyclam; C2O4 = oxalate, ox), there are two independent halves of the [CrCl2(cyclam)](+) and [Cr(ox)(cyclam)](+) cations, and one perchlorate anion. In the complex cations, which are completed by application of twofold rotation symmetry, the Cr(III) ions are coordinated by the four N atoms of a cyclam ligand, and by two chloride ions or one oxalate bidentate ligand in a cis arrangement, displaying an overall distorted octa-hedral coordination environment...
October 1, 2016: Acta Crystallographica. Section E, Crystallographic Communications
See Mun Lee, Kong Mun Lo, Sang Loon Tan, Edward R T Tiekink
The Yb(III) atom in the title complex, [Yb(C27H24Cl3N4O3)] [systematic name: (2,2',2''-{(nitrilo)-tris-[ethane-2,1-di-yl(nitrilo)-methylyl-idene]}tris-(4-chloro-phenolato)ytterbium(III)], is coordinated by a trinegative, hepta-dentate ligand and exists within an N4O3 donor set, which defines a capped octa-hedral geometry whereby the amine N atom caps the triangular face defined by the three imine N atoms. The packing features supra-molecular layers that stack along the a axis, sustained by a combination of aryl-C-H⋯O, imine-C-H⋯O, methyl-ene-C-H⋯π(ar-yl) and end-on C-Cl⋯π(ar-yl) inter-actions...
October 1, 2016: Acta Crystallographica. Section E, Crystallographic Communications
Krzysztof Lyczko
A new polymorph of the title compound, [Re(NCS)(C7H8N2O)(CO)3], crystallizing in the space group P21/n, has been obtained and structurally characterized by the experiment and DFT calculations. In this complex, the rhenium(I) cation is octa-hedrally coordinated by three carbonyl groups in a facial configuration, the N,O-bidentate N-methyl-pyridine-2-carboxamide ligand and the N-bonded thio-cyanate anion. Neighbouring mol-ecules are linked into a three-dimensional network by inter-molecular N-H⋯S and C-H⋯S inter-actions...
October 1, 2016: Acta Crystallographica. Section E, Crystallographic Communications
Hannah F Drake, Kraig A Wheeler, Brian J Bellott
The centrosymmetric title complex, [μ-ethane-1,2-diylbis(di-phenyl-phosphane)-κ(2)P:P']bis-[penta-carbonyl-tungsten(0)], [W2(C26H24P2)(CO)10], consists of two W(CO)5 moieties bridged by a bis-(di-phenyl-phosphan-yl)ethane (dppe) ligand. The W(0) atom has a slightly distorted octa-hedral coordination environment consisting of 5 carbonyl ligands and one P atom from the bridging dppe ligand with the nearest W(0) atom 5.625 (5) Å away. The complex resides on a center of symmetry.
October 1, 2016: Acta Crystallographica. Section E, Crystallographic Communications
Nurcan Akduran, Hacali Necefoğlu, Ömer Aydoğdu, Tuncer Hökelek
In the title complex, [Zn(C8H4NO2)2(C10H14N2O)2(H2O)2], the Zn(II) cation, located on an inversion centre, is coordinated by two water mol-ecules, two 4-cyano-benzoate (CB) anions and two di-ethyl-nicotinamide (DENA) ligands in a distorted N2O4 octa-hedral geometry. In the mol-ecule, the dihedral angle between the planar carboxyl-ate group and the adjacent benzene ring is 9.50 (14)°, while the benzene and pyridine rings are oriented at a dihedral angle of 56.99 (5)°. The water mol-ecules exhibit both an intra-molecular hydrogen bond [to the non-coordinating carboxyl-ate O atom, enclosing an S(6) hydrogen-bonding motif, where O⋯O = 2...
October 1, 2016: Acta Crystallographica. Section E, Crystallographic Communications
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