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https://www.readbyqxmd.com/read/27910660/low-noise-heterodyne-receiver-for-electron-cyclotron-emission-imaging-and-microwave-imaging-reflectometry
#1
B Tobias, C W Domier, N C Luhmann, C Luo, M Mamidanna, T Phan, A-V Pham, Y Wang
The critical component enabling electron cyclotron emission imaging (ECEI) and microwave imaging reflectometry (MIR) to resolve 2D and 3D electron temperature and density perturbations is the heterodyne imaging array that collects and downconverts radiated emission and/or reflected signals (50-150 GHz) to an intermediate frequency (IF) band (e.g. 0.1-18 GHz) that can be transmitted by a shielded coaxial cable for further filtering and detection. New circuitry has been developed for this task, integrating gallium arsenide (GaAs) monolithic microwave integrated circuits (MMICs) mounted on a liquid crystal polymer (LCP) substrate...
November 2016: Review of Scientific Instruments
https://www.readbyqxmd.com/read/27910132/a-simple-method-for-preparation-of-pure-68-ga-acetate-precursor-for-formulation-of-radiopharmaceuticals-physicochemical-characteristics-of-the-68-ga-eluate-of-the-sno2-based-68-ge-68-ga-column-generator
#2
Sankha Chattopadhyay, Md Neyar Alam, Madhu Smita, Umesh Kumar, Sujata Saha Das, Luna Barua
Gallium-68 radioisotope is an excellent source in clinical positron emission tomography application due to its ease of availability from germanium-68 ((68) Ge)/gallium-68 ((68) Ga) generator having a shelf life of 1 year. In this paper, a modified method for purification of the primary eluate of (68) Ge-(68) Ga generator by using a small cation exchange resin (Dowex-50) column has been described. The breakthrough of (68) Ge before and after purification of (68) Ga eluate was 0.014% and 0.00027%, respectively...
December 1, 2016: Journal of Labelled Compounds & Radiopharmaceuticals
https://www.readbyqxmd.com/read/27904870/preclinical-study-of-68-ga-dotatoc-biodistribution-assessment-in-syrian-rats-and-evaluation-of-absorbed-dose-in-human-organs
#3
Mojdeh Naderi, Samaneh Zolghadri, Hassan Yousefnia, Ali Ramazani, Amir Reza Jalilian
OBJECTIVES: Gallium-68 DOTA-DPhe(1)-Tyr(3)-Octreotide ((68)Ga-DOTATOC) has been applied by several European centers for the treatment of a variety of human malignancies. Nevertheless, definitive dosimetric data are yet unavailable. According to the Society of Nuclear Medicine and Molecular Imaging, researchers are investigating the safety and efficacy of this radiotracer to meet Food and Drug Administration requirements. The aim of this study was to introduce the optimized procedure for (68)Ga-DOTATOC preparation, using a novel germanium-68 ((68)Ge)/(68)Ga generator in Iran and evaluate the absorbed doses in numerous organs with high accuracy...
2016: Asia Oceania Journal of Nuclear Medicine & Biology
https://www.readbyqxmd.com/read/27897250/fluorinated-benzalkylsilane-molecular-rectifiers
#4
Zachary A Lamport, Angela D Broadnax, David Harrison, Katrina J Barth, Lee Mendenhall, Clayton T Hamilton, Martin Guthold, Timo Thonhauser, Mark E Welker, Oana D Jurchescu
We report on the synthesis and electrical properties of nine new alkylated silane self-assembled monolayers (SAMs) - (EtO)3Si(CH2)nN = CHPhX where n = 3 or 11 and X = 4-CF3, 3,5-CF3, 3-F-4-CF3, 4-F, or 2,3,4,5,6-F, and explore their rectification behavior in relation to their molecular structure. The electrical properties of the films were examined in a metal/insulator/metal configuration, with a highly-doped silicon bottom contact and a eutectic gallium-indium liquid metal (EGaIn) top contact. The junctions exhibit high yields (>90%), a remarkable resistance to bias stress, and current rectification ratios (R) between 20 and 200 depending on the structure, degree of order, and internal dipole of each molecule...
November 29, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27892523/ultraviolet-optomechanical-crystal-cavities-with-ultrasmall-modal-mass-and-high-optomechanical-coupling-rate
#5
Wen Zhou, Zejie Yu, Jingwen Ma, Bingqing Zhu, Hon Ki Tsang, Xiankai Sun
Optomechanical crystal (OMC) cavities which exploit the simultaneous photonic and phononic bandgaps in periodic nanostructures have been utilized to colocalize, couple, and transduce optical and mechanical resonances for nonlinear interactions and precision measurements. The development of near-infrared OMC cavities has difficulty in maintaining a high optomechanical coupling rate when scaling to smaller mechanical modal mass because of the reduction of the spatial overlap between the optical and mechanical modes...
November 28, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27887852/morphological-and-functional-imaging-of-neck-paragangliomas
#6
J-P Guichard, N Fakhry, J Franc, P Herman, C-A Righini, D Taieb
OBJECTIVE: To review the optimal techniques for localization and characterization of neck paragangliomas (PGL). MATERIAL AND METHODS: Systematic review of the literature from the PubMed/Medline database. RESULTS: Neck PGL are hypervascular tumours essentially arising from paraganglionic tissue situated at the carotid bifurcation (carotid body) and along the vagus nerve. Morphological and functional imaging are indicated to confirm the diagnosis, identify multifocal disease and for local and regional staging...
November 22, 2016: European Annals of Otorhinolaryngology, Head and Neck Diseases
https://www.readbyqxmd.com/read/27878437/neurosarcoidosis-a-clinical-approach-to-diagnosis-and-management
#7
Richard T Ibitoye, A Wilkins, N J Scolding
Sarcoidosis is a rare but important cause of neurological morbidity, and neurological symptoms often herald the diagnosis. Our understanding of neurosarcoidosis has evolved from early descriptions of a uveoparotid fever to include presentations involving every part of the neural axis. The diagnosis should be suspected in patients with sarcoidosis who develop new neurological symptoms, those presenting with syndromes highly suggestive of neurosarcoidosis, or neuro-inflammatory disease where more common causes have been excluded...
November 22, 2016: Journal of Neurology
https://www.readbyqxmd.com/read/27877874/growth-condition-dependence-of-unintentional-oxygen-incorporation-in-epitaxial-gan
#8
Felix Schubert, Steffen Wirth, Friederike Zimmermann, Johannes Heitmann, Thomas Mikolajick, Stefan Schmult
Growth conditions have a tremendous impact on the unintentional background impurity concentration in gallium nitride (GaN) synthesized by molecular beam epitaxy and its resulting chemical and physical properties. In particular for oxygen identified as the dominant background impurity we demonstrate that under optimized growth stoichiometry the growth temperature is the key parameter to control its incorporation and that an increase by 55 °C leads to an oxygen reduction by one order of magnitude. Quantitatively this reduction and the resulting optical and electrical properties are analyzed by secondary ion mass spectroscopy, photoluminescence, capacitance versus voltage measurements, low temperature magneto-transport and parasitic current paths in lateral transistor test structures based on two-dimensional electron gases...
2016: Science and Technology of Advanced Materials
https://www.readbyqxmd.com/read/27876341/imaging-of-neuroendocrine-tumors-of-the-pancreas
#9
C Dromain, D Déandréis, J-Y Scoazec, D Goere, M Ducreux, E Baudin, L Tselikas
Pancreatic neuroendocrine tumors (PNETs) are rare and represent a heterogeneous disease. PNET can be functioning or non-functioning with different clinical presentations and different prognosis based on WHO and pTNM classifications. The role of imaging includes the localization of small functioning tumor, differentiation of these tumors from adenocarcinoma, identification of signs of malignancy and evaluation of extent. PNETs have a broad spectrum of appearance. On CT and MRI, most of functioning PNETs are well defined small tumors with intense and homogeneous enhancement on arterial and portal phases...
December 2016: Diagnostic and Interventional Imaging
https://www.readbyqxmd.com/read/27867531/steroid-pulse-therapy-was-effective-for-cardiac-sarcoidosis-with-ventricular-tachycardia-and-systolic-dysfunction
#10
Toshitaka Okabe, Tadayuki Yakushiji, Michiaki Hiroe, Yuji Oyama, Wataru Igawa, Morio Ono, Takehiko Kido, Seitaro Ebara, Kennosuke Yamashita, Myong Hwa Yamamoto, Shigeo Saito, Koichi Hoshimoto, Amemiya Kisaki, Naoei Isomura, Hiroshi Araki, Masahiko Ochiai
A 32-year-old man presented with palpitation. He was diagnosed with pulmonary sarcoidosis by lung biopsy. The electrocardiogram showed first-degree atrioventricular block and complete right bundle branch block (CRBBB). We planned to examine laboratory data, echocardiography, Holter monitoring, and gallium-67 scintigraphy. Before he went through all these exams, he developed ventricular tachycardia. After defibrillation was performed, his electrocardiogram revealed complete atrioventricular block. We observed elevation of serum angiotensin-converting enzyme levels...
December 2016: ESC Heart Failure
https://www.readbyqxmd.com/read/27865023/layered-post-transition-metal-dichalcogenides-x-m-m-x-and-their-properties
#11
Jan Luxa, Yong Wang, Zdenek Sofer, Martin Pumera
A(III) B(VI) chalcogenides are an interesting group of layered semiconductors with several attractive properties, such as tunable band gaps and the formation of solid solutions. Unlike the typically sandwiched structure of transition-metal dichalcogenides, A(III) B(VI) layered chalcogenides with hexagonal symmetry are stacked through the X-M-M-X motif, in which M is gallium and indium, and X is sulfur, selenium, and tellurium. In view of the inadequate study of the electrochemical properties and great interest in layered materials towards energy-related research, herein the inherent electrochemistry of GaS, GaSe, GaTe, and InSe has been studied, as well as the exploration of their potential as hydrogen evolution reaction (HER) electrocatalysts...
November 16, 2016: Chemistry: a European Journal
https://www.readbyqxmd.com/read/27862456/heat-resistant-mechanoluminescent-chromism-of-the-hybrid-molecule-based-on-boron-ketoiminate-modified-octa-substituted-polyhedral-oligomeric-silsesquioxane
#12
Kazumasa Suenaga, Kazuo Tanaka, Yoshiki Chujo
This manuscript reports the rational design and development of the heat-resistant mechanoluminescent chromic (MLC) molecule based on a photoluminescent organoboron dye and an organic-inorganic hybrid molecular scaffold. Luminescent organoboron complexes were introduced into polyhedral oligomeric silsesquioxane (POSS) at each vertex via the rigid linker structure not only for suppressing molecular interaction which induces concentration quenching but also for obtaining high molecular symmetry which would be favorable to enhance heat resistance...
November 14, 2016: Chemistry: a European Journal
https://www.readbyqxmd.com/read/27859732/semiconductor-metal-organic-frameworks-future-low-bandgap-materials
#13
Muhammad Usman, Shruti Mendiratta, Kuang-Lieh Lu
Metal-organic frameworks (MOFs) with low density, high porosity, and easy tunability of functionality and structural properties, represent potential candidates for use as semiconductor materials. The rapid development of the semiconductor industry and the continuous miniaturization of feature sizes of integrated circuits toward the nanometer (nm) scale require novel semiconductor materials instead of traditional materials like silicon, germanium, and gallium arsenide etc. MOFs with advantageous properties of both the inorganic and the organic components promise to serve as the next generation of semiconductor materials for the microelectronics industry with the potential to be extremely stable, cheap, and mechanically flexible...
November 18, 2016: Advanced Materials
https://www.readbyqxmd.com/read/27858258/application-of-reflectance-confocal-microscopy-to-evaluate-skin-damage-after-irradiation-with-an-yttrium-scandium-gallium-garnet-ysgg-laser
#14
Xueping Yue, Hongwei Wang, Qing Li, Linfeng Li
The objective of this study was to observe the characteristics of the skin after irradiation with a 2790-nm yttrium-scandium-gallium-garnet (YSGG) laser using reflectance confocal microscopy (RCM). A 2790-nm YSGG laser was used to irradiate fresh foreskin (four doses, at spot density 3) in vitro. The characteristics of microscopic ablative columns (MAC), thermal coagulation zone (TCZ), and microscopic treatment zones (MTZ) were observed immediately after irradiation using digital microscope and RCM. The characteristics of MAC, TCZ, and MTZ with variations in pulse energy were comparatively analyzed...
November 17, 2016: Lasers in Medical Science
https://www.readbyqxmd.com/read/27857354/low-temperature-grown-gaas-carrier-lifetime-evaluation-by-double-optical-pump-terahertz-time-domain-emission-spectroscopy
#15
Valynn Katrine Mag-Usara, Stefan Funkner, Gudrun Niehues, Elizabeth Ann Prieto, Maria Herminia Balgos, Armando Somintac, Elmer Estacio, Arnel Salvador, Kohji Yamamoto, Muneaki Hase, Masahiko Tani
We present the use of a "double optical pump" technique in terahertz time-domain emission spectroscopy as an alternative method to investigate the lifetime of photo-excited carriers in semiconductors. Compared to the commonly employed optical pump-probe transient photo-reflectance, this non-contact and room temperature characterization technique allows relative ease in achieving optical alignment. The technique was implemented to evaluate the carrier lifetime in low temperature-grown gallium arsenide (LT-GaAs)...
November 14, 2016: Optics Express
https://www.readbyqxmd.com/read/27856328/the-therapeutic-potential-of-iron-targeting-gallium-compounds-in-human-disease-from-basic-research-to-clinical-application
#16
REVIEW
Christopher R Chitambar
Gallium, group IIIa metal, shares certain chemical characteristics with iron which enable it to function as an iron mimetic that can disrupt iron-dependent tumor cell growth. Gallium may also display antimicrobial activity by disrupting iron homeostasis in certain bacteria and fungi. Gallium's action on iron homeostasis leads to inhibition of ribonucleotide reductase, mitochondrial function, and changes in proteins of iron transport and storage. In addition, gallium induces an increase in mitochondrial reactive oxygen species in cells which triggers downstream upregulation of metallothionein and hemoxygenase-1...
November 14, 2016: Pharmacological Research: the Official Journal of the Italian Pharmacological Society
https://www.readbyqxmd.com/read/27846819/clinical-features-treatment-and-outcome-in-neurosarcoidosis-systematic-review-and-meta-analysis
#17
Daan Fritz, Diederik van de Beek, Matthijs C Brouwer
BACKGROUND: Neurosarcoidosis is a rare variant of sarcoidosis and is only described in small cohort studies. We define clinical features, treatment and outcome of patients with neurosarcoidosis over the last 35 years. METHODS: We performed a systematic review and meta-analysis of studies on neurosarcoidosis published between 1980 and 2016. Studies were included if they reported at least 5 cases. Studies describing one specific neurological presentation were excluded...
November 15, 2016: BMC Neurology
https://www.readbyqxmd.com/read/27846559/subthreshold-schottky-barrier-thin-film-transistors-with-ultralow-power-and-high-intrinsic-gain
#18
Sungsik Lee, Arokia Nathan
The quest for low power becomes highly compelling in newly emerging application areas related to wearable devices in the Internet of Things. Here, we report on a Schottky-barrier indium-gallium-zinc-oxide thin-film transistor operating in the deep subthreshold regime (i.e., near the OFF state) at low supply voltages (<1 volt) and ultralow power (<1 nanowatt). By using a Schottky-barrier at the source and drain contacts, the current-voltage characteristics of the transistor were virtually channel-length independent with an infinite output resistance...
October 21, 2016: Science
https://www.readbyqxmd.com/read/27843513/bilateral-choroidal-metastases-from-endobronchial-carcinoid-treated-with-somatostatin-analogues
#19
Deborah De Bruyn, Jan Lamont, Erik Vanderstraeten, Simon Van Belle, Elise Platteau, Julie De Zaeytijd, Kristien P Hoornaert
OBJECTIVE: To describe a patient with bilateral multifocal choroidal metastases from an endobronchial carcinoid treated with a somatostatin analogue. METHOD: A 60-year-old woman presenting with photopsia in the left eye underwent an extensive ophthalmic examination, including fluorescein angiography, OCT and ultrasound. RESULTS: Fundoscopy revealed a small retinal tear in the left eye, for which she received laser treatment. In addition, choroidal masses were detected in both eyes...
2016: Open Ophthalmology Journal
https://www.readbyqxmd.com/read/27834429/correction-ga-osi-o-t-bu-3-3%C3%A2-thf-a-thermolytic-molecular-precursor-for-high-surface-area-gallium-containing-silica-materials-of-controlled-dispersion-and-stoichiometry
#20
James P Dombrowski, Gregory R Johnson, Alexis T Bell, T Don Tilley
Correction for 'Ga[OSi(O(t)Bu)3]3·THF, a thermolytic molecular precursor for high surface area gallium-containing silica materials of controlled dispersion and stoichiometry' by James P. Dombrowski et al., Dalton Trans., 2016, 45, 11025-11034.
November 11, 2016: Dalton Transactions: An International Journal of Inorganic Chemistry
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