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https://www.readbyqxmd.com/read/28529799/new-m-m-3-arsenates-the-framework-structures-of-agm-3-haso4-2-m-3-al-ga-and-m-gaas2o7-m-na-ag
#1
Karolina Schwendtner, Uwe Kolitsch
The crystal structures of hydro-thermally synthesized silver(I) aluminium bis-[hydrogen arsenate(V)], AgAl(HAsO4)2, silver(I) gallium bis-[hydrogen arsenate(V)], AgGa(HAsO4)2, silver gallium diarsenate(V), AgGaAs2O7, and sodium gallium diarsenate(V), NaGaAs2O7, were determined from single-crystal X-ray diffraction data collected at room temperature. The first two compounds are representatives of the MCV-3 structure type known for KSc(HAsO4)2, which is characterized by a three-dimensional anionic framework of corner-sharing alternating M(3+)O6 octa-hedra (M = Al, Ga) and singly protonated AsO4 tetra-hedra...
May 1, 2017: Acta Crystallographica. Section E, Crystallographic Communications
https://www.readbyqxmd.com/read/28529797/crystal-structure-of-aqua-trans-bis-dimethyl-sulfoxide-%C3%AE%C2%BAo-pyridine-2-6-di-carboxyl-ato-%C3%AE%C2%BA-3-o-2-n-o-6-nickel-ii
#2
Chen Liu, Ashley C Felts, Daisuke Takahashi, Wesley S Kinden, Khalil A Abboud
In the title complex, [Ni(C7H3NO4)(C2H6OS)2(H2O)], the Ni(II) cation is situated on a twofold rotation axis and exhibits a distorted octa-hedral NO5 coordination environment defined by a tridentate pyridine-2,6-di-carb-oxy-lic acid dianion (dpa(2-)), two dimethyl sulfoxide (DMSO) mol-ecules, and a water mol-ecule. In the crystal, the complex mol-ecules are linked by O-H⋯O and C-H⋯O hydrogen bonds into a three-dimensional network whereby DMSO mol-ecules from neighboring complexes overlap to form layers parallel to (001), alternating with layers of Ni(II)-dpa(2-) moieties...
May 1, 2017: Acta Crystallographica. Section E, Crystallographic Communications
https://www.readbyqxmd.com/read/28529794/crystal-structures-of-two-alkaline-earth-m-ba-and-sr-dimanganese-ii-iron-iii-tris-orthophosphates
#3
Ghaleb Alhakmi, Abderrazzak Assani, Mohamed Saadi, Lahcen El Ammari
Two new orthophosphates, BaMn2Fe(PO4)3 [barium dimanganese(II) iron(III) tris-(orthophosphate)] and SrMn2Fe(PO4)3 [strontium dimanganese(II) iron(III) tris-(orthophosphate)], were synthesized by solid-state reactions. They are isotypic and crystallize in the ortho-rhom-bic system with space group type Pbcn. Their crystal structures comprise infinite zigzag chains of edge-sharing FeO6 octa-hedra (point group symmetry .2.) and Mn2O10 double octa-hedra running parallel to [001], linked by two types of PO4 tetra-hedra...
May 1, 2017: Acta Crystallographica. Section E, Crystallographic Communications
https://www.readbyqxmd.com/read/28529782/crystal-structure-of-the-mixed-metal-tris-ulfide-bacu1-3ta2-3s3
#4
Kejun Bu, Jianqiao He, Dong Wang, Chong Zheng, Fuqiang Huang
The mixed-metal title compound, BaCu1/3Ta2/3S3 [barium copper(II) tantalum(V) tris-ulfide], was prepared through solid-state reactions. The crystal structure adopts the BaTaS3 structure type and consists of face-sharing [MS6] (M = Ta,Cu) octa-hedra (point-group symmetry -3m.) that are condensed into infinite chains along [001]. Adjacent chains are linked through the barium cations (site symmetry -6m2), which exhibit a coordination number of twelve. The M site is occupied by 2/3 of Ta(V) and 1/3 of Cu(II), whereby the average M-S distances are slightly longer than those of ordered BaTaS3...
May 1, 2017: Acta Crystallographica. Section E, Crystallographic Communications
https://www.readbyqxmd.com/read/28529781/crystal-structure-of-catena-poly-di-aqua-bis-2-4-6-tri-methyl-benzoato-%C3%AE%C2%BAo-cobalt-ii-%C3%AE-aqua-%C3%AE%C2%BA-2-o-o-dihydrate
#5
Tuncer Hökelek, Nurcan Akduran, Safiye Özkaya, Hacali Necefoğlu
The asymmetric unit of the title one-dimensional polymeric compound, {[Co(C10H11O2)2(H2O)3]·2H2O} n , contains one Co(II) cation situated on a centre of inversion, one-half of a coordinating water mol-ecule, one 2,4,6-tri-methyl-benzoate (TMB) anion together with one coordinating and one non-coordinating water mol-ecule; the TMB anion acts as a monodentate ligand. In the anion, the carboxyl-ate group is twisted away from the attached benzene ring by 84.9 (2)°. The Co(II) atom is coordinated by two TMB anions and two water mol-ecules in the basal plane, while another water mol-ecule bridges the Co(II) atoms in the axial directions, forming polymeric chains running along [001]...
May 1, 2017: Acta Crystallographica. Section E, Crystallographic Communications
https://www.readbyqxmd.com/read/28529772/trans-di-chlorido-bis-dimethyl-sulfoxide-%C3%AE%C2%BAo-bis-4-fluoro-benzyl-%C3%AE%C2%BAc-1-tin-iv-crystal-structure-and-hirshfeld-surface-analysis
#6
Nur Adibah Binti Mohd Amin, Rusnah Syahila Duali Hussen, See Mun Lee, Nathan R Halcovitch, Mukesh M Jotani, Edward R T Tiekink
The Sn(IV) atom in the title diorganotin compound, [Sn(C7H6F)2Cl2(C2H6OS)2], is located on a centre of inversion, resulting in the C2Cl2O2 donor set having an all-trans disposition of like atoms. The coordination geometry approximates an octa-hedron. The crystal features C-H⋯F, C-H⋯Cl and C-H⋯π inter-actions, giving rise to a three-dimensional network. The respective influences of the Cl⋯H/H⋯Cl and F⋯H/H⋯F contacts to the mol-ecular packing are clearly evident from the analysis of the Hirshfeld surface...
May 1, 2017: Acta Crystallographica. Section E, Crystallographic Communications
https://www.readbyqxmd.com/read/28525681/unveiling-idiopathic-macular-telangiectasia-clinical-applications-of-optical-coherence-tomography-angiography
#7
Marco A Gonzalez, Diana Shechtman, Jay M Haynie, Leo Semes
PURPOSE: Idiopathic macular telangiectasia type 2 (IMT2) is a bilateral acquired maculopathy, with a spectrum of clinical presentations associated with inner retinal telangiectatic vascular anomalies. Cases often are underdiagnosed or misdiagnosed. Current diagnostic modalities such as spectral-domain optical coherence tomography (SD-OCT) and fluorescein angiography (FA) are valuable to the understanding of the clinicopathology. More recently, optical coherence tomography angiography (OCTA), as an emerging noninvasive technology, has been shown to be particularly useful in the assessment and management of IMT2...
May 19, 2017: European Journal of Ophthalmology
https://www.readbyqxmd.com/read/28515959/impact-of-image-quality-on-oct-angiography-based-quantitative-measurements
#8
Mayss Al-Sheikh, Khalil Ghasemi Falavarjani, Handan Akil, SriniVas R Sadda
BACKGROUND: To study the impact of image quality on quantitative measurements and the frequency of segmentation error with optical coherence tomography angiography (OCTA). METHODS: Seventeen eyes of 10 healthy individuals were included in this study. OCTA was performed using a swept-source device (Triton, Topcon). Each subject underwent three scanning sessions 1-2 min apart; the first two scans were obtained under standard conditions and for the third session, the image quality index was reduced using application of a topical ointment...
2017: International Journal of Retina and Vitreous
https://www.readbyqxmd.com/read/28514814/-possibilities-and-limitations-of-oct-angiography-in-patients-with-central-serous-chorioretinopathy
#9
B Cakir, M Reich, S J Lang, A Bühler, A Stahl, D Böhringer, H Agostini, C Lange
Purpose Central serous chorioretinopathy (CSC) is a commonly acquired maculopathy characterized by the accumulation of subretinal fluid at the posterior pole. This study aims to analyze optical coherence tomography angiography (OCTA) findings in patients with acute and chronic CSC and to compare them to conventional imaging methods. Methods A series of 43 consecutive eyes of 29 patients diagnosed with CSC and 18 eyes of 9 healthy control subjects were included in this retrospective study. The OCTA images were assessed and compared to conventional fluorescence (FAG) and indocyanine green angiography (ICG)...
May 17, 2017: Klinische Monatsblätter Für Augenheilkunde
https://www.readbyqxmd.com/read/28513181/synthesis-of-8-cycloparaphenylene-octacarboxylates-via-rh-catalyzed-stepwise-cross-alkyne-cyclotrimerization
#10
Norihiko Hayase, Yuta Miyauchi, Yukimasa Aida, Haruki Sugiyama, Hidehiro Uekusa, Yu Shibata, Ken Tanaka
The synthesis of C4- and C2-symmetrical [8]cycloparaphenylene (CPP)-octacarboxylates has been achieved via macrocyclization by the rhodium-catalyzed intermolecular stepwise cross-cyclotrimerization and subsequent reductive aromatization. The C4-symmetrical octa-tert-butyl [8]CPP-octacarboxylate forms a dimer in which eight ester moieties face each other. The dimers are aligned so as to make a one-dimensional column with a channel structure inside. Both absorption and fluorescence maxima of [8]CPP-octacarboxylates in CHCl3 were significantly blue-shifted compared to those of [8]CPP due to the presence of eight electron-withdrawing ester moieties...
May 17, 2017: Organic Letters
https://www.readbyqxmd.com/read/28512424/optical-coherence-tomography-angiography-of-retinal-microvascular-changes-overlying-choroidal-nodules-in-neurofibromatosis-type-1
#11
Catherine Cassiman, Ingele Casteels, Peter Stalmans, Eric Legius, Julie Jacob
PURPOSE: To report 3 cases of neurofibromatosis type 1 (NF1) with choroidal nodules associated with retinal microvascular changes imaged with optical coherence tomography angiography (OCTA). METHODS: Small case series in 3 NF1 patients. OCTA examinations were performed by a trained examiner (J.J.) after pupillary dilation. A standard scan, centered over the macula measuring 6 × 6 mm and 3 × 3 mm was obtained according to the findings on standard color photography...
January 2017: Case Reports in Ophthalmology
https://www.readbyqxmd.com/read/28510295/scandium-mediated-formation-of-a-bis-tetrahydropentalene
#12
Janek Rausch, Phil Liebing, Volker Lorenz, Liane Hilfert, Sabine Busse, Caecilia Maichle-Mössmer, Frank T Edelmann
The reactivity of Li[Sc(COT'')2 ] (1; COT''=1,4-bis(trimethylsilyl)cyclooctatetraenyl) towards CoCl2 is considerably different from that of related lanthanide triple-decker sandwich complexes. In addition to the expected triple-decker complex Sc2 (COT'')3 (2), the complex Sc2 {μ-BTHP}(COT'')2 (3) is formed, which comprises the novel BTHP(2-) ligand (BTHP(2-) =bis(3,5-bis(trimethylsilyl)-1,3a,6,6a-tetrahydropentalene-1-yl)diide or bis(2,7-bis(trimethylsilyl)bicyclo[3.3.0]octa-2,7-dien-4-yl)diide, C16 H10 (SiMe3 )4(2-) )...
May 16, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28501447/comparison-of-quantitative-measurement-of-foveal-avascular-zone-and-macular-vessel-density-in-eyes-of-children-with-amblyopia-and-healthy-controls-an-optical-coherence-tomography-angiography-study
#13
Ihsan Yilmaz, Osman Bulut Ocak, Basak Saracoglu Yilmaz, Aslı Inal, Birsen Gokyigit, Muhittin Taskapili
PURPOSE: To quantify vessel density of superficial capillary plexus (SCP), deep capillary plexus (DCP), and the foveal avascular zone (FAZ) of children's amblyopic eyes and to compare the measurements with those of companion eyes and age-matched controls. METHODS: Fifteen patients with strabismic amblyopia, and 15 age-matched controls were included in this cross-sectional study. SCP, DCP, and FAZ were measured via optical coherence tomographic angiography (OCTA)...
May 10, 2017: Journal of AAPOS: the Official Publication of the American Association for Pediatric Ophthalmology and Strabismus
https://www.readbyqxmd.com/read/28499049/quantitative-comparison-of-swept-source-and-spectral-domain-oct-angiography-in-healthy-eyes
#14
Mayss Al-Sheikh, Khalil Ghasemi Falavarjani, Tudor C Tepelus, SriniVas R Sadda
BACKGROUND AND OBJECTIVE: To compare macular vessel density (VD) and foveal avascular zone (FAZ) area in healthy individuals using two different optical coherence tomography angiography (OCTA) devices. PATIENTS AND METHODS: In this prospective, comparative study, 25 eyes of 14 healthy subjects underwent fovea-centered 3 mm × 3 mm OCTA-imaging using the Triton (Topcon, Tokyo, Japan) and RS-3000 (Nidek, Gamagori, Japan) OCTA devices. Superficial and deep retinal layers (SRL/DRL) and FAZ were manually graded after threshold standardization to determine macular VD and area of the FAZ...
May 1, 2017: Ophthalmic Surgery, Lasers & Imaging Retina
https://www.readbyqxmd.com/read/28499048/three-different-optical-coherence-tomography-angiography-measurement-methods-for-assessing-capillary-density-changes-in-diabetic-retinopathy
#15
Alexandre Pedinielli, Sophie Bonnin, Mohamed El Sanharawi, Valérie Mané, Ali Erginay, Aude Couturier, Ramin Tadayoni
BACKGROUND AND OBJECTIVE: To compare capillary density (CD) changes assessed by optical coherence tomography angiography (OCTA) during diabetic retinopathy (DR) progression using three previously published methods: binarization, skeletonization, and automated flow density (AFD). PATIENTS AND METHODS: Retrospective study of 98 eyes of 74 patients with diabetes and 18 control eyes imaged using OCTA. The macular CD at each stage of DR was assessed using the three methods and were compared to control eyes...
May 1, 2017: Ophthalmic Surgery, Lasers & Imaging Retina
https://www.readbyqxmd.com/read/28494517/exploration-of-peripapillary-vessel-density-in-highly-myopic-eyes-with-peripapillary-intrachoroidal-cavitation-and-its-relationship-with-ocular-parameters-using-optical-coherence-tomography-angiography
#16
Chen Qiuying, He Jiangnan, Hua Yihong, Fan Ying
IMPORTANCE: Identifying changes of peripapillary vessel density in highly myopic eyes with peripapillary intrachoroidal cavitation (PICC) by optical coherence tomography angiography (OCTA). BACKGROUND: To investigate peripapillary vessel density and its relationship with other ocular parameters in highly myopic eyes with PICC. DESIGN: This was a hospital-based, cross-sectional study. PARTICIPANTS: Thirty-five highly myopic eyes with PICC, 46 highly myopic eyes without PICC and 36 normal eyes were included in this study...
May 11, 2017: Clinical & Experimental Ophthalmology
https://www.readbyqxmd.com/read/28493437/extended-axial-imaging-range-widefield-swept-source-optical-coherence-tomography-angiography
#17
Gangjun Liu, Jianlong Yang, Jie Wang, Yan Li, Pengxiao Zang, Yali Jia, David Huang
We developed a high-speed, swept source OCT system for widefield OCT angiography (OCTA) imaging. The system has an extended axial imaging range of 6.6 mm. An electrical lens is used for fast, automatic focusing. The recently developed split-spectrum amplitude and phase-gradient angiography allow high-resolution OCTA imaging with only two B-scan repetitions. An improved post-processing algorithm effectively removed trigger jitter artifacts and reduced noise in the flow signal. We demonstrated high contrast 3 mm×3 mm OCTA image with 400×400 pixels acquired in 3 seconds and high-definition 8 mm×6 mm and 12 mm×6 mm OCTA images with 850×400 pixels obtained in 4 seconds...
May 11, 2017: Journal of Biophotonics
https://www.readbyqxmd.com/read/28485132/robust-numerical-phase-stabilization-for-long-range-swept-source-optical-coherence-tomography
#18
Shaozhen Song, Jingjiang Xu, Shaojie Men, Tueng T Shen, Ruikang K Wang
A novel phase stabilization technique is demonstrated with significant improvement in the phase stability of a micro-electromechanical (MEMS) vertical cavity surface-emitting laser (VCSEL) based swept-source optical coherence tomography (SS-OCT) system. Without any requirements of hardware modifications, the new fully numerical phase stabilization technique features high tolerance to acquisition jitter, and significantly reduced budget in computational effort. We demonstrate that when measured with biological tissue, this technique enables a phase sensitivity of 89 mrad in highly scattering tissue, with image ranging distance of up to 12...
May 9, 2017: Journal of Biophotonics
https://www.readbyqxmd.com/read/28483496/relationship-between-internal-reflectivity-of-diabetic-microaneurysms-on-sd-oct-and-detection-on-oct-angiography
#19
Mariacristina Parravano, Daniele De Geronimo, Fabio Scarinci, Lea Querques, Gianni Virgili, Joseph Michael Simonett, Monica Varano, Francesco Bandello, Giuseppe Querques
PURPOSE: To correlate the appearance of Microaneurysms (MAs) on structural spectral-domain optical coherence tomography (SD-OCT) with their detection on OCT angiography (OCTA) in patients with non-proliferative diabetic retinopathy (NPDR). DESIGN: Inter-instrument reliability study. METHODS: Sixteen patients with NPDR without macular edema underwent SD-OCT and OCTA. To compare MAs seen on OCTA to those on SD-OCT, we superimposed the OCTA superficial capillary plexus (SCP) vascular landmarks onto those of the near infrared...
May 5, 2017: American Journal of Ophthalmology
https://www.readbyqxmd.com/read/28465249/the-application-of-optical-coherence-tomography-angiography-in-uveitis-and-inflammatory-eye-diseases
#20
REVIEW
Francesco Pichi, David Sarraf, Sruthi Arepalli, Careen Y Lowder, Emmett T Cunningham, Piergiorgio Neri, Thomas A Albini, Vishali Gupta, Kimberly Baynes, Sunil K Srivastava
Since its introduction in the early 1990s, optical coherence tomography (OCT) has evolved in resolution and technological advances, and in recent years its initial application of assessing the morphology of a tissue has been implemented by the study of its functional blood flow, through optical coherence tomography angiography (OCTA). This novel technique details capillary networks by comparing the amount of light returned from static and moving targets without the need for intravenous dye administration. While this imaging modality has been used for various ocular conditions, the application OCTA to uveitis conditions remains sparse...
April 29, 2017: Progress in Retinal and Eye Research
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