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https://www.readbyqxmd.com/read/28098279/eu-3-doped-y3-xndxal3o12-garnet-synthesis-and-structural-investigation
#1
L Pavasaryte, A Katelnikovas, V Klimavicius, V Balevicius, A Krajnc, G Mali, J Plavec, A Kareiva
Nd(3+)-Doped yttrium aluminium garnet and Eu(3+)-Nd(3+)-co-doped yttrium aluminium garnet were synthesized using an environmentally friendly sol-gel method at low temperatures. The results of X-ray diffraction (XRD) analysis of the powders sintered at 1000 °C showed the purity and formation of monophasic compounds. The phase composition and purity confirmation of the samples were also characterized via FTIR spectroscopy. Desirable microstructural features and particle size of phosphorous materials of the polycrystalline samples were studied via scanning electron microscopy (SEM)...
January 18, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28095562/the-efficacy-of-q-switched-nd-yag-1064-nm-laser-in-recalcitrant-macular-amyloidosis-a-case-report
#2
Nevil Khurana, Christine Urman
Macular amyloidosis typically presents as small, dusky-brown or greyish pigmented macules, the result of altered keratin deposition. Treatment of these hyperpigmented regions with topical and systemic therapies remains challenging, however Q-Switched neodymi- um-doped yttrium aluminum garnet (ND:YAG) laser has proven to be an effective treatment modality to reduce hyperpigmentation. In this case report we investigated the ef cacy of Q-Switched Nd:YAG laser treatment on a 34-year old woman with recalcitrant macular amyloidosis who failed to respond to over-the-counter bleaching creams...
November 1, 2016: Journal of Drugs in Dermatology: JDD
https://www.readbyqxmd.com/read/28078375/assessing-intra-arterial-complications-of-planning-and-treatment-angiograms-for-y-90-radioembolization
#3
Osman Ahmed, Mikin V Patel, Abdulrahman Masrani, Bradford Chong, Mohammed Osman, Jordan Tasse, Jayesh Soni, Ulku Cenk Turba, Bulent Arslan
PURPOSE: To report hepatic arterial-related complications encountered during planning and treatment angiograms for radioembolization and understand any potential-associated risk factors. MATERIALS AND METHODS: 518 mapping or treatment angiograms for 180 patients with primary or metastatic disease to the liver treated by Yttrium-90 radioembolization between 2/2010 and 12/2015 were retrospectively reviewed. Intra-procedural complications were recorded per SIR guidelines...
January 11, 2017: Cardiovascular and Interventional Radiology
https://www.readbyqxmd.com/read/28078116/pretreatment-tumor-volume-as-a-prognostic-factor-in-metastatic-colorectal-cancer-treated-with-selective-internal-radiation-to-the-liver-using-yttrium-90-resin-microspheres
#4
Neha Bhooshan, Navesh K Sharma, Shahed Badiyan, Adeel Kaiser, Fred M Moeslein, Young Kwok, Pradip P Amin, Svetlana Kudryasheva, Michael D Chuong
BACKGROUND: Yttrium-90 ((90)Y)-resin microspheres can prolong intrahepatic disease control and improve overall survival (OS) in patients with metastatic colorectal cancer (CRC). Prognostic factors for improved outcomes in patients undergoing selective internal radiation therapy (SIRT) have been studied, but the relationship between pre-SIRT liver tumor volume and outcomes has not well described. METHODS: We retrospectively reviewed the records of patients with metastatic CRC who were treated at our institution with (90)Y-resin microspheres...
December 2016: Journal of Gastrointestinal Oncology
https://www.readbyqxmd.com/read/28073261/insulating-nanomagnets-driven-by-spin-torque
#5
Matthias B Jungfleisch, Junjia Ding, Wei Zhang, Wanjun Jiang, John E Pearson, Valentine Novosad, Axel Hoffmann
Magnetic insulators, such as yttrium iron garnet (Y3Fe5O12), are ideal materials for ultralow power spintronics applications due to their low energy dissipation and efficient spin current generation and transmission. Recently, it has been realized that spin dynamics can be driven very effectively in micrometer-sized Y3Fe5O12/Pt heterostructures by spin-Hall effects. We demonstrate here the excitation and detection of spin dynamics in Y3Fe5O12/Pt nanowires by spin-torque ferromagnetic resonance. The nanowires defined via electron-beam lithography are fabricated by conventional room temperature sputtering deposition on Gd3Ga5O12 substrates and lift-off...
January 11, 2017: Nano Letters
https://www.readbyqxmd.com/read/28068567/anthropogenic-rare-earth-elements-and-their-spatial-distributions-in-the-han-river-south-korea
#6
Hyeongseok Song, Woo-Jin Shin, Jong-Sik Ryu, Hyung Seon Shin, Heesun Chung, Kwang-Sik Lee
Rare earth elements (REE) consist of lanthanides (from La to Lu), together with yttrium and scandium, in which anthropogenic REE, such as gadolinium (Gd), lanthanum (La), and samarium (Sm), has emerged as micro-contaminants in natural waters in highly developed countries. Here, we collected water samples in the Han River (HR) and its tributaries flowing through Seoul Capital Area, the world's second largest metropolitan area in order to examine how and to what extent anthropogenic REE anomalies may occur. Water samples show higher light REE concentrations than heavy REE concentrations, while wastewater treatment plant (WWTP) samples display much higher heavy REE concentrations due to high Gd concentration...
December 29, 2016: Chemosphere
https://www.readbyqxmd.com/read/28065436/long-term-posterior-capsule-opacification-reduction-with-square-edge-polymethylmethacrylate-intraocular-lens-randomized-controlled-study
#7
Aravind Haripriya, David F Chang, Balakrishnan Vijayakumar, Agrawal Niraj, Madhu Shekhar, Singh Tanpreet, Srinivasan Aravind
PURPOSE: To objectively assess the long-term posterior capsule opacification (PCO) and neodymium-doped yttrium aluminium garnet (Nd:YAG) capsulotomy rate of a square-edge (SE) polymethylmethacrylate (PMMA) intraocular lens (IOL) modification in comparison with a round-edge (RE) PMMA IOL or an SE hydrophobic acrylic IOL (SE-Acrylic). DESIGN: Prospective, randomized, controlled fellow eye clinical study. PARTICIPANTS: Ninety-four patients scheduled for bilateral phacoemulsification had an SE-PMMA IOL implanted in 1 eye...
January 5, 2017: Ophthalmology
https://www.readbyqxmd.com/read/28061356/clinical-differences-in-autofluorescence-between-viable-and-nonvital-bone-a-case-report-with-histopathologic-evaluation-performed-on-medication-related-osteonecrosis-of-the-jaws
#8
Ilaria Giovannacci, Marco Meleti, Domenico Corradi, Paolo Vescovi
Medication-related osteonecrosis of the jaws (MRONJ) is an adverse side effect of several drug therapies, including bisphosphonates (BPs). Osteonecrosis of the jaw specifically related to BP therapy is usually referred to using the acronym BRONJ. However, no consensus has yet been reached regarding the most appropriate management of BRONJ. The greatest success rates have been recorded with surgical removal of necrotic bone. In particular, erbium:yttrium-aluminum-garnet (Er:YAG) laser-assisted surgery has shown significantly better results than conventional surgical approaches...
December 15, 2016: Journal of Oral and Maxillofacial Surgery
https://www.readbyqxmd.com/read/28060468/reducing-hysteresis-and-enhancing-performance-of-perovskite-solar-cells-using-low-temperature-processed-y-doped-sno2-nanosheets-as-electron-selective-layers
#9
Guang Yang, Hongwei Lei, Hong Tao, Xiaolu Zheng, Junjie Ma, Qin Liu, Weijun Ke, Zhiliang Chen, Liangbin Xiong, Pingli Qin, Zhao Chen, Minchao Qin, Xinhui Lu, Yanfa Yan, Guojia Fang
Despite the rapid increase of efficiency, perovskite solar cells (PSCs) still face some challenges, one of which is the current-voltage hysteresis. Herein, it is reported that yttrium-doped tin dioxide (Y-SnO2 ) electron selective layer (ESL) synthesized by an in situ hydrothermal growth process at 95 °C can significantly reduce the hysteresis and improve the performance of PSCs. Comparison studies reveal two main effects of Y doping of SnO2 ESLs: (1) it promotes the formation of well-aligned and more homogeneous distribution of SnO2 nanosheet arrays (NSAs), which allows better perovskite infiltration, better contacts of perovskite with SnO2 nanosheets, and improves electron transfer from perovskite to ESL; (2) it enlarges the band gap and upshifts the band energy levels, resulting in better energy level alignment with perovskite and reduced charge recombination at NSA/perovskite interfaces...
January 2017: Small
https://www.readbyqxmd.com/read/28059929/hepatic-progression-free-and-overall-survival-after-regional-therapy-to-the-liver-for-metastatic-melanoma
#10
Andrea M Abbott, Matthew P Doepker, Youngchul Kim, Matthew C Perez, Cassandra Gandle, Kerry L Thomas, Junsung Choi, Ravi Shridhar, Jonathan S Zager
OBJECTIVES: Regional therapy for metastatic melanoma to the liver represents an alternative to systemic therapy. Hepatic progression-free survival (HPFS), progression-free survival (PFS), and overall survival (OS) were evaluated. MATERIALS AND METHODS: A retrospective review of patients with liver metastases from cutaneous or uveal melanoma treated with yttrium-90 (Y90), chemoembolization (CE), or percutaneous hepatic perfusion (PHP) was conducted. RESULTS: Thirty patients (6 Y90, 10 PHP, 12 CE, 1 PHP then Y90, 1 CE then PHP) were included...
January 4, 2017: American Journal of Clinical Oncology
https://www.readbyqxmd.com/read/28058161/posterior-capsular-opacification-in-preschool-and-school-age-patients-after-pediatric-cataract-surgery-without-posterior-capsulotomy
#11
Muhammed Batur, Adem Gül, Erbil Seven, Ertuğrul Can, Tekin Yaşar
OBJECTIVES: We aimed to evaluate the development of posterior capsular opacification (PCO) in preschool- and school-age children with cataract who underwent cataract surgery without posterior capsulotomy and anterior vitrectomy. MATERIALS AND METHODS: The records of 30 eyes of 21 patients who underwent pediatric cataract surgery and intraocular lens (IOL) implantation were retrospectively reviewed. Patients' age, PCO status and duration, need for neodymium-doped yttrium aluminium garnet (Nd:YAG) laser treatment based on coverage of visual axis, and follow-up period were recorded...
October 2016: Turkish Journal of Ophthalmology
https://www.readbyqxmd.com/read/28048361/we-de-201-07-measurement-of-real-time-dose-for-tandem-and-ovoid-brachytherapy-procedures-using-a-high-precision-optical-fiber-radiation-detector
#12
M D Belley, A Faught, B Moore, E Subashi, B Langloss, M J Therien, T T Yoshizumi, J P Chino, O Craciunescu
PURPOSE: Development of a novel on-line dosimetry tool is needed to move toward patient-specific quality assurance measurements for Ir-192 HDR brachytherapy to verify accurate dose delivery to the intended location. This work describes the development and use of a nano-crystalline yttrium oxide inorganic scintillator based optical-fiber detector capable of acquiring real-time high-precision dose measurements during tandem and ovoid (T&O) gynecological (GYN) applicator Ir-192 HDR brachytherapy procedures...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28047827/su-c-204-01-a-dosimetric-investigation-into-the-effects-of-yttrium-90-radioembolization-on-the-gi-tract-in-vivo-and-histological-analysis-in-an-animal-model
#13
A Pasciak, L Nodit, A Bourgeois, B Paxton, A Arepally, Y Bradley
PURPOSE: In Yttrium-90 (90Y) radioembolization, non-target embolization (NTE) to the stomach or small bowel can result in ulceration, a rare but difficult to manage clinical complication. However, dosimetric thresholds for toxicity to these tissues from radioembolization have never been evaluated in a controlled setting. We performed an analysis of the effect of 90Y radioembolization in a porcine model at different absorbed-dose endpoints. METHODS: Under approval of the University of Tennessee IACUC, 6 female pigs were included in this study...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28047017/su-c-204-07-radiation-therapy-as-a-potential-treatment-for-obesity-initial-data-from-a-preclinical-investigation
#14
A Pasciak, Y Bradley, L Nodit, A Bourgeois, B Paxton, A Arepally
PURPOSE: To evaluate the feasibility of Yttrium-90 (90Y) radionuclide therapy as a potential treatment for obesity in a porcine model. As the only appetite-stimulating hormone, localized targeting of ghrelin-producing X/A cells in the fundus of the stomach using 90Y may reduce serum ghrelin levels and decrease hunger. METHODS: Under approval of the University of Tennessee IACUC, 8 young female pigs aged 12-13 weeks and weighing 21.8-28.1 Kg were included in this study...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28046479/we-ab-bra-05-pet-guided-delivery-quality-evaluation-of-yttrium-90-microsphere-radioembolizaton-for-hepatocellular-carcinoma-patients-the-optimal-sequence-of-radioembolizaton-and-chemoembolization-treatments
#15
M Lin, B Saboury
PURPOSE: Selective-internal-radiation-therapy (SIRT) and transarterial-chemoembolization (TACE) are commonly used for treatment of liver tumors. The use of TACE, which is macroembolic, prior to SIRT may cause hemodynamic changes in tumor vasculature that impair yttrium-90 (90Y) microsphere delivery to the targeted lesions. This work aims to quantify dosimetric tumor coverage using 90Y positron emission tomography (PET) dosimetry after SIRT alone compared to TACE followed by SIRT. METHODS: A total of 40 consecutive hepatocellular carcinoma (HCC) SIRT patients who had a post-SIRT 90Y PET/CT scan were evaluated...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28040851/impact-of-laser-pulse-duration-on-the-reduction-of-intraocular-pressure-during-selective-laser-trabeculoplasty
#16
Spela Stunf Pukl, Brigita Drnovšek-Olup
PURPOSE: To evaluate the efficacy of selective laser trabeculoplasty (SLT) to lower intraocular pressure (IOP) in patients with primary open-angle glaucoma (POAG), normal tension glaucoma (NTG) or ocular hypertension (OHT), when performed with laser pulse duration of 1 ns compared with standard 3-5 ns. METHODS: Bilateral SLT with a 532 nm Q-switched neodymium-doped yttrium aluminium garnet laser was conducted in 30 patients (60 eyes) with POAG (n = 5), NTG (n = 2) or OHT (n = 23)...
December 31, 2016: International Ophthalmology
https://www.readbyqxmd.com/read/28032953/ultrasmall-yig-nanoparticles-with-high-coercivity-at-low-temperature-synthesized-by-laser-ablation-and-fragmentation-of-pressed-powders
#17
Tim Schmitz, Ulf Wiedwald, Carsten Dubs, Bilal Gökce
Pulsed laser ablation of pressed yttrium-ion-garnet powders in water is studied and compared to the ablation of a single crystal target. We find that target porosity is a crucial factor which has far-reaching implications on nanoparticle productivity. Although nanoparticle size distributions obtained by analytical disc centrifugation and transmission electron microscopy (TEM) are in agreement, X-ray diffraction and energy dispersive X-ray analysis show that only nanoparticles obtained from targets with densities close to that of a bulk target lead to comparable properties...
December 29, 2016: Chemphyschem: a European Journal of Chemical Physics and Physical Chemistry
https://www.readbyqxmd.com/read/28018941/modularized-compact-positron-emission-tomography-detector-for-rapid-system-development
#18
Daoming Xi, Xiang Liu, Chen Zeng, Wei Liu, Yanzhao Li, Yuexuan Hua, Xiongze Mei, Heejong Kim, Peng Xiao, Chien-Min Kao, Qingguo Xie
We report the development of a modularized compact positron emission tomography (PET) detector that outputs serial streams of digital samples of PET event pulses via an Ethernet interface using the UDP/IP protocol to enable rapid configuration of a PET system by connecting multiple such detectors via a network switch to a computer. Presently, the detector is [Formula: see text] in extent (excluding I/O connectors) and contains an [Formula: see text] array of [Formula: see text] one-to-one coupled lutetium-yttrium oxyorthosilicate/silicon photomultiplier pixels...
January 2017: Journal of Medical Imaging
https://www.readbyqxmd.com/read/28012419/formulation-and-purification-of-therapeutic-dose-of-90-y-labeled-peptides-some-interesting-radiochemistry-aspects
#19
Rubel Chakravarty, Sudipta Chakraborty, Ashutosh Dash
Yttrium-90 obtained from most of the (90)Sr/(90)Y generators contains (90)Sr impurity above permissible limit for human administration. A protocol has been optimized for formulation of therapeutic dose of (90)Y-DOTA-Tyr(3)-octreotate ((90)Y-DOTA-TATE) and removal of (90)Sr impurity from it. The radiochemical purity of (90)Y-DOTA-TATE was found to be >98% and it met the requirements for clinical use. The radiopharmaceutical was used in preliminary clinical investigation in patients with neuroendocrine tumors...
December 19, 2016: Applied Radiation and Isotopes
https://www.readbyqxmd.com/read/28009880/ln-polyoxocations-yttrium-oxide-solution-speciation-solution-deposited-thin-films
#20
David A Marsh, Sara Goberna-Ferrón, Mary K Baumeister, Lev N Zakharov, May Nyman, Darren W Johnson
Rare earth oxide materials, including thin film coatings, are critically important in magnetic, luminescent and microelectric devices, and few substitutes have been discovered with comparable performance. Thin film coatings from solution are almost unknown for rare earth oxides, likely due to their high activity towards hydrolysis which yields poor quality thin films. The hexamer [Ln6(O)(OH)8(H2O)12(NO3)6](2+) is a rare example of a metal-oxo cluster isolated and stabilized without additional supporting organic ligands...
December 23, 2016: Dalton Transactions: An International Journal of Inorganic Chemistry
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