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Abhinanda Kundu, Mariko Inoue, Haruki Nagae, Hayato Tsurugi, Kazushi Mashima
A mixed ligated amidoyttrium complex, Y(NBn2 )(L1)(THF)2 (8, L1 = N,N'-bis(2,6-diisopropylphenyl)ethylenediamine), served as a catalyst for addition of the ortho-pyridyl C(sp2 )-H bond of 2-substituted pyridines to non-activated imines; complex 8 showed superior catalytic performance compared with Y[N(SiMe3 )2 ]3 (1) and Y[N(SiMe3 )2 ]2 (NBn2 )(THF) (2). Concerning the reaction mechanism, we conducted a stoichiometric reaction of an alkylyttrium complex, Y(CH2 SiMe3 )(L1)(THF)2 (7), with 2-ethylpyridine (4e), giving a mixture of (η3 -pyridylmethyl)yttrium complex 9 and (η2 -pyridyl)yttrium complex 10 along with elimination of SiMe4 ...
May 18, 2018: Journal of the American Chemical Society
Roberta Guzzinati, Elena Sarti, Martina Catani, Valentina Costa, Antonella Pagnoni, Annalisa Martucci, Elisa Rodeghero, Donatella Capitani, Massimiliana Pietrantonio, Alberto Cavazzini, Luisa Pasti
The adsorption behavior of neodymium (Nd3+) and yttrium (Y3+) cations on synthetic FAU zeolite 13X in its sodium form (Na13X) has been investigated by means of an approach based on both macroscopic (namely, adsorption isotherm determination and thermal analysis) and microscopic measurements (including solid-state NMR spectroscopy and X-ray powder diffraction). The multidisciplinary study has revealed some unexpected features. Firstly, adsorption constants of cations are not correlated to their ionic radii (or hydration enthalpy)...
May 18, 2018: Chemphyschem: a European Journal of Chemical Physics and Physical Chemistry
Daniel S Dale, Valeriia N Starovoitova, Tony A Forest, Emily Oliphant
The use of fracing has risen over the past decade and revolutionized energy production in the US. However, there is still an impetus for further optimization of the extraction of oil and natural gas from vast shale reservoirs. In this work, we discuss photonuclear production of yttrium-88 as a promising radiotracer for fracing operations. Single neutron knock-out from natural monoisotopic yttrium-89 is an inexpensive process resulting in high activity of 88 Y with minimal impurities. MCNPX simulations were performed to estimate the 88 Y yield...
May 5, 2018: Applied Radiation and Isotopes
Teerapon Pirom, Amornchai Arponwichanop, Ura Pancharoen, Tetsu Yonezawa, Soorathep Kheawhom
Yttrium (Y) is an essential lanthanide rare earth element and can be effectively extracted and purified using a hollow fiber supported liquid membrane (HFSLM) system. However, the stability of HFSLM system is a significant challenge. Pseudoemulsion-hollow fiber strip dispersion (PEHFSD) system, providing excellent stability, is attracting research attention. In this work, the recovery of Y(III) by PEHFSD system using di(2-ethylhexyl)phosphoric acid (D2EHPA) as a carrier was investigated. The effects of several operating parameters, including the initial concentration of Y(III) in the feed phase, the flow rate of feed, the stirring speed and the volumetric ratio of feed to strip on Y(III) separation were studied...
May 16, 2018: Scientific Reports
Alexandra Ya Freidzon, Ilia A Kurbatov, Vitaliy I Vovna
The energy levels of Ln3+ ions are known to be only slightly dependent on the ion environment. This allows one to predict the spectra of f-f transitions in Ln3+ complexes using group theory and simple semiempirical models: Russell-Saunders scheme for spin-orbit coupling, ligand-field theory for the splitting of the electronic levels, and Judd-Ofelt parameterization for reproducing the intensity of f-f transitions. Nevertheless, a fully ab initio computational scheme employing no empirical parameterization and suitable for any asymmetrical environment of Ln3+ would be instructive...
May 16, 2018: Physical Chemistry Chemical Physics: PCCP
Cátia Figueiredo, Tiago F Grilo, Clara Lopes, Pedro Brito, Mário Diniz, Miguel Caetano, Rui Rosa, Joana Raimundo
Rare earth elements (REEs) comprise elements from lanthanum to lutetium that together with yttrium and scandium are emergent contaminants of critical importance for numerous groundbreaking environmental technologies. Transfer to aquatic ecosystems is expected to increase, however, little information is known about their potential impacts in marine biota. Considering the endangered conservation status of the European eel (Anguilla anguilla) and the vulnerability of early fish life stages to contaminants, we exposed glass eels, through water, to an environmentally relevant concentration (120 ng...
May 7, 2018: Chemosphere
Young-Jun Choi, Jung Yup Kim, Jae-Hui Nam, Ga-Young Lee, Won-Serk Kim
BACKGROUND: Currently no study has evaluated the effect of the novel 1064-nm picosecond neodymium-doped:yttrium aluminium garnet laser (ps-Nd:YAG) for reducing Hypertrophic scarring (HS). OBJECTIVE: The aim of this study was to verify the efficacy and safety of a 1064-nm ps-Nd:YAG in the management of HS. MATERIALS AND METHODS: A retrospective chart review and photographic analysis were conducted on patients treated with a low-fluence 1064-nm ps-Nd:YAG for HS improvement...
May 14, 2018: Journal of Cosmetic and Laser Therapy: Official Publication of the European Society for Laser Dermatology
Ashley A Weiner, Bin Gui, Neil B Newman, John L Nosher, Fady Yousseff, Shou-En Lu, Gretchen M Foltz, Darren Carpizo, Jonathan Lowenthal, Darryl A Zuckerman, Ben Benson, Jeffrey R Olsen, Salma K Jabbour, Parag J Parikh
PURPOSE: To identify clinical parameters that are prognostic for improved overall survival (OS) after yttrium-90 radioembolization (RE) in patients with liver metastases from colorectal cancer (CRC). MATERIALS AND METHODS: A total of 131 patients who underwent RE for liver metastases from CRC, treated at 2 academic centers, were reviewed. Twenty-one baseline pretreatment clinical factors were analyzed in relation to OS by the Kaplan-Meier method along with log-rank tests and univariate and multivariate Cox regression analyses...
May 10, 2018: Journal of Vascular and Interventional Radiology: JVIR
Joshua Loewenstern, Colton Welch, Safet Lekperic, Vivian Bishay, Mona Ranade, Rahul S Patel, Edward Kim, F Scott Nowakowski, Robert A Lookstein, Aaron M Fischman
PURPOSE: To compare differences in patient radiation exposure (PRE) during transarterial yttrium-90 (90 Y) radioembolization (TARE) between transradial access (TRA) and transfemoral access (TFA). MATERIALS AND METHODS: A total of 810 consecutive first-time TARE procedures in patients from 2013 to 2017 were retrospectively reviewed. A propensity score-matching (PSM) analysis matched TRA and TFA groups on the basis of patient age, sex, weight, height, cancer type, 90 Y microsphere type, and number of previous procedures from the same and opposite approaches...
May 9, 2018: Journal of Vascular and Interventional Radiology: JVIR
Frederico Goyatá, Yvna Galvão, Thamyryz-Rafaela Simões, Luiz-Felipe Goyatá, José-Alcides Arruda, Amália Moreno
Background: The purpose of this in vitro study was to evaluate the effect of conventional surface treatment with acid solutions on the surface roughness of a zirconia-based ceramic. Material and Methods: Specimens of yttrium-tetragonal zirconia polycrystal (Y-TZP) -based ceramic were fabricated (5.0 x 5.0 x 2.0 mm, n=40). The specimens were submitted to the tested surface treatment method and divided into 4 groups (n=10): no treatment-control (GI), airborne 110 µm aluminum oxide particle abrasion for 1 minute-conventional method (GII); etching with 48% hydrofluoric acid for 2 minutes (GIII), and nitric acid/hydrofluoric acid etching for 2 minutes (GIV)...
April 2018: Journal of Clinical and Experimental Dentistry
Ilaria Giovannacci, Giovanna Giunta, Giuseppe Pedrazzi, Marco Meleti, Maddalena Manfredi, Mario Migliario, Matteo Brucoli, Alberta Greco Lucchina, Carmen Mortellaro, Paolo Vescovi
INTRODUCTION: Different osteotomy techniques have been proposed in order to improve postoperative course of impacted third molar extraction. The aim is to evaluate the possible advantages achieved with erbium yttrium-aluminum-garnet (Er:YAG) laser osteotomy compared with traditional burs. MATERIALS AND METHODS: Seventy-six extractions were randomly classified into 2 groups according to osteotomy instrument: group 1 (G1)-Er:YAG laser: 35 patients; group 2 (G2)-traditional bur: 41 patients...
May 8, 2018: Journal of Craniofacial Surgery
Wen Deng, Yulong An, Guoliang Hou, Shuangjian Li, Huidi Zhou, Jianmin Chen
Inconel 718 was used as the substrate and preheated at different temperatures to deposit yttrium stabilized zirconia (denoted as YSZ) coatings by atmospheric plasma spraying. The microstructure of the as-deposited YSZ coatings and those after cavitation-erosion tests were characterized by field emission scanning electron microscopy, Raman spectroscopy, and their hardness and toughness as well as cavitation-erosion resistance were evaluated in relation to the effect of substrate preheating temperature. Results indicate that the as-deposited YSZ coatings exhibit typical layered structure and consist of columnar crystals...
September 2018: Ultrasonics Sonochemistry
Kavi K Devulapalli, Nicholas Fidelman, Michael C Soulen, Matthew Miller, Matthew S Johnson, Eric Addo, Ghassan El-Haddad, Charles Nutting, James Morrison, Khashayar Farsad, R Peter Lokken, Ron C Gaba, Jacob Fleming, Daniel B Brown, Sharon W Kwan, Steven C Rose, Kevin A Pennycooke, David M Liu, Sarah B White, Ripal Gandhi, Ann A Lazar, Robert K Kerlan
Purpose To determine the frequency of hepatobiliary infections after transarterial radioembolization (TARE) with yttrium 90 (90 Y) in patients with liver malignancy and a history of biliary intervention. Materials and Methods For this retrospective study, records of all consecutive patients with liver malignancy and history of biliary intervention treated with TARE at 14 centers between 2005 and 2015 were reviewed. Data regarding liver function, 90 Y dosimetry, antibiotic prophylaxis, and bowel preparation prophylaxis were collected...
May 8, 2018: Radiology
Gerardo Garces, Sandra Cabeza, Rafael Barea, Pablo Pérez, Paloma Adeva
Alternative processing routes such as powder metallurgy, the extrusion of recycled chips, or equal channel angular pressing (ECAP) have been considered for effective methods of maintaining the high mechanical strength of Mg-Y-Zn alloys containing long-period stacking ordered structures with respect to the alloy processed by the conventional extrusion of as-cast ingots with the advantage of minimizing the yttrium content. A yield stress similar to that found for extruded Mg97 Y₂Zn₁ alloy can be attained with only half of the usual yttrium and zinc additions thanks to the grain refinement induced by ECAP processing...
May 5, 2018: Materials
Ryan Yudistiro, Hirofumi Hanaoka, Natsumi Katsumata, Aiko Yamaguchi, Yoshito Tsushima
The overexpression of vascular endothelial growth factor (VEGF) in varying types of solid tumor renders radioimmunotherapy (RIT) with the anti-VEGF antibody bevacizumab (BV) a promising treatment. However, the slow blood clearance of BV, which may increase the occurrence risk of hematotoxicity, hinders the application of BV-RIT. Using the avidin chase is a long-known blood clearance enhancement strategy for biotinylated-mAb. To enhance RIT efficacy by increasing the radioactivity dose, we evaluated the ability of avidin to accelerate the blood clearance of yttrium-90 (90 Y)-labeled biotinylated BV (90 Y-Bt-BV) in a xenograft mouse model of triple-negative breast cancer (TNBC)...
May 7, 2018: Molecular Pharmaceutics
Xiaoyu Che, Koichi Murata, Lei Pan, Qing Lin He, Guoqiang Yu, Qiming Shao, Gen Yin, Peng Deng, Yabin Fan, Bo Ma, Xiao Liang, Bin Zhang, Xiaodong Han, Lei Bi, Qing-Hui Yang, Huaiwu Zhang, Kang L Wang
Breaking the time reversal symmetry (TRS) in a topological insulator (TI) by introducing a magnetic order gives rise to exotic quantum phenomena. One of the promising routes to inducing a magnetic order in a TI is utilizing magnetic proximity effect between a TI and a strong magnetic insulator (MI). In this article, we demonstrate a TI/MI heterostructure prepared through transferring a molecular beam epitaxy (MBE)-grown Bi2Se3 film onto a yttrium iron garnet (YIG) substrate via wet-transfer. The transferred Bi2Se3 exhibits excellent quality over a large scale...
May 7, 2018: ACS Nano
Osama Ali Mohammed, Amr Mounir, Amin Aboali Hassan, Alahmady Hamad Alsmman, Engy Mohamed Mostafa
PURPOSE: To evaluate the efficacy of neodymium:yttrium-aluminum-garnet (Nd:YAG) laser for treatment of epithelial ingrowth after laser in situ keratomileusis (LASIK). PATIENTS AND METHODS: Fifty-eight patients with epithelial ingrowth presented to Sohag refractive center, Sohag, Egypt, between January 2015 and March 2017. Only 41 patients (18 females and 23 males, mean age: 33.4 years) involving 41 eyes were indicated for treatment by Nd:YAG laser as the rest of the eyes were only under observation...
May 4, 2018: International Ophthalmology
Jin Ok Baek, Il-Joong Park, Kyung Real Lee, Ha Ryeong Ryu, Jeongsoo Kim, Seulki Lee, Yu Ri Kim, Hoon Hur
OBJECTIVES: Café-au-lait macules (CALMs) are benign cutaneous hyperpigmentary disorders. Usually, laser therapies for cosmetic concerns result in more severe side effects in the people of Asian descent than that of Caucasians. Unfortunately, there is no gold standard for the laser treatment of CALMs in skin of people of Asian descent. To investigate the efficacy and safety of a high-fluence 1064-nm Q-switched neodymium-doped yttrium aluminum garnet (Nd:YAG) laser treatment of CALMs in Asian patients...
May 3, 2018: Journal of Cosmetic Dermatology
Yuki Tomozawa, Younes Jahangiri, Priya Pathak, Kenneth J Kolbeck, Ryan C Schenning, John A Kaufman, Khashayar Farsad
PURPOSE: To evaluate long-term effects of yttrium-90 (90 Y) transarterial radioembolization (TARE) for unresectable hepatic metastases of neuroendocrine tumors (NETs). MATERIALS AND METHODS: Retrospective analysis of 93 patients (47 women, 46 men; mean age 59 y) who underwent resin-based 90 Y TARE was performed. Variables associated with overall survival were analyzed using univariate and multivariate models. Changes in serologic values and imaging characteristics were assessed with long-term follow-up...
April 30, 2018: Journal of Vascular and Interventional Radiology: JVIR
Matthew D Miller, Daniel Y Sze, Siddharth A Padia, Robert J Lewandowski, Riad Salem, Philani Mpofu, Paul M Haste, Matthew S Johnson
PURPOSE: To evaluate the effectiveness and safety of yttrium-90 transarterial radioembolization (TARE) for the treatment of primary and metastatic soft tissue sarcoma (STS) of the liver. MATERIALS AND METHODS: A retrospective review of 39 patients with primary (n = 2) and metastatic (n = 37) hepatic STS treated with TARE at 4 institutions was performed. Fourteen STS subtypes were included, with leiomyosarcoma being the most common (51%). TARE with glass (22 patients) or resin (17 patients) microspheres was performed, with single lobe (17 patients) or bilobar treatment (22 patients) based on disease burden...
April 30, 2018: Journal of Vascular and Interventional Radiology: JVIR
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