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https://www.readbyqxmd.com/read/28929295/characterization-of-phenolic-pellets-for-esr-dosimetry-in-photon-beam-radiotherapy
#1
Salvatore Gallo, Giuseppina Iacoviello, Salvatore Panzeca, Ivan Veronese, Antonio Bartolotta, Daniele Dondi, Anna Maria Gueli, Gianfranco Loi, Anna Longo, Eleonora Mones, Maurizio Marrale
This work deals with the dosimetric features of a particular phenolic compound (IRGANOX 1076(®)) for dosimetry of clinical photon beams by using electron spin resonance (ESR) spectroscopy. After the optimization of the ESR readout parameters (namely modulation amplitude and microwave power) to maximise the signal without excessive spectrum distortions, basic dosimetric properties of laboratory-made phenolic dosimeters in pellet form, such as reproducibility, dose-response, sensitivity, linearity and dose rate dependence were investigated...
September 19, 2017: Radiation and Environmental Biophysics
https://www.readbyqxmd.com/read/28928535/effects-of-concentration-method-and-storage-time-on-some-bioactive-compounds-and-color-of-jujube-ziziphus-jujuba-var-vulgaris-concentrate
#2
Najmeh Shams Najafabadi, Mohammad Ali Sahari, Mohsen Barzegar, Zohreh Hamidi Esfahani
Jujube extract was concentrated by various heating methods including vacuum, microwave and conventional heating. The effect of concentration methods and storage time (for 90 days at 4 °C) on total phenolic and total monomeric anthocyanin contents, individual anthocyanins, individual organic acids, and color values of jujube concentrate was investigated separately. The desired level of concentration (65.0 °Brix) was achieved in 45, 96 and 117 min by the microwave, vacuum and conventional heating methods, respectively...
August 2017: Journal of Food Science and Technology
https://www.readbyqxmd.com/read/28928481/erratum-determination-of-low-loss-in-isotopically-pure-single-crystal-28-si-at-low-temperatures-and-single-microwave-photon-energy
#3
Nikita Kostylev, Maxim Goryachev, Andrey D Bulanov, Vladimir A Gavva, Michael E Tobar
This corrects the article DOI: 10.1038/srep44813.
September 20, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28928450/nonreciprocal-reconfigurable-microwave-optomechanical-circuit
#4
N R Bernier, L D Tóth, A Koottandavida, M A Ioannou, D Malz, A Nunnenkamp, A K Feofanov, T J Kippenberg
Nonreciprocal microwave devices are ubiquitous in radar and radio communication and indispensable in the readout chains of superconducting quantum circuits. Since they commonly rely on ferrite materials requiring large magnetic fields that make them bulky and lossy, there has been significant interest in magnetic-field-free on-chip alternatives, such as those recently implemented using the Josephson nonlinearity. Here, we realize reconfigurable nonreciprocal transmission between two microwave modes using purely optomechanical interactions in a superconducting electromechanical circuit...
September 19, 2017: Nature Communications
https://www.readbyqxmd.com/read/28927661/local-control-and-survival-after-image-guided-percutaneous-ablation-of%C3%A2-adrenal%C3%A2-metastases
#5
Nathan E Frenk, Dania Daye, Kemal Tuncali, Ronald S Arellano, Paul B Shyn, Stuart G Silverman, Florian J Fintelmann, Raul N Uppot
PURPOSE: To evaluate local control and survival after image-guided ablation of adrenal gland metastases. MATERIALS AND METHODS: Image-guided ablations of adrenal metastases measuring < 5 cm performed at 2 academic medical centers between July 2002 and June 2016 were analyzed. There were 51 procedures performed on 46 tumors (mean diameter 2.8 cm ± 1.1; range, 0.7-4.9 cm) in 38 patients (mean age 66 y; range, 41-80 y) with renal cell carcinoma (n = 17 patients; 45%), non-small cell lung cancer (n = 10 patients; 26%), and other primary malignancies (n = 11 patients; 29%)...
September 16, 2017: Journal of Vascular and Interventional Radiology: JVIR
https://www.readbyqxmd.com/read/28927614/fast-microwave-assisted-green-synthesis-of-xanthan-gum-grafted-acrylic-acid-for-enhanced-methylene-blue-dye-removal-from-aqueous-solution
#6
Edwin Makhado, Sadanand Pandey, Philiswa N Nomngongo, James Ramontja
In the present project, graft polymerization was employed to synthesis a novel adsorbent using acrylic acid (AA) and xanthan gum (XG) for cationic methylene dye (MB(+)) removal from aqueous solution. The XG was rapidly grafted with acrylic acid (CH2=CHCOOH) under microwave heating. Fourier-transform infrared spectroscopy (FTIR), Proton Nuclear magnetic resonance spectroscopy ((1)H NMR), scanning electron microscopy (SEM), X-ray diffraction (XRD) and Thermal gravimetric analysis (TGA) techniques were used to verify the adsorbent formed under optimized reaction conditions...
November 15, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28926244/weak-hydrogen-bond-network-a-rotational-study-of-1-1-1-2-tetrafluoroethane-dimer
#7
Xiaolong Li, Yang Zheng, Junhua Chen, Jens-Uwe Grabow, Qian Gou, Zhining Xia, Gang Feng
The 1,1,1,2-tetrafluoroethane dimer has been investigated by pulsed jet Fourier transform microwave spectroscopy. One conformer, stabilized through a network of four C-H∙∙∙F-C interactions, has been observed although several almost isoenergetic configurations were suggested by ab initio. The measurements, extended to four 13C species in natural abundance, allow to determine the carbon skeleton structures and to evaluate the weak hydrogen bond parameters. Information on the dissociation energy is also provided...
September 19, 2017: Journal of Physical Chemistry. A
https://www.readbyqxmd.com/read/28926078/an-expedient-synthesis-of-flexible-nucleosides-via-a-regiocontrolled-enzymatic-glycosylation-of-functionalized-imidazoles
#8
S Vichier-Guerre, L Dugué, F Bonhomme, S Pochet
A versatile two-step synthesis of C4- and C5-arylated 2'-deoxyribosylimidazoles was elaborated using enzymatic N-transglycosylation followed by microwave-assisted Pd-catalysed arylation reactions. We report herein the reaction conditions that permit managing regioselectivity (N3 versus N1-isomers) in the enzymatic glycosylation of 4-iodoimidazole using the nucleoside N-deoxyribosyltransferase from L. leichmannii. Regiocontrolled glycosylation was also observed among several other imidazole derivatives studied, providing simple access to isomers not readily accessible by chemical routes...
September 19, 2017: Organic & Biomolecular Chemistry
https://www.readbyqxmd.com/read/28925381/cavity-qed-with-hybrid-nanocircuits-from-atomic-like-physics-to-condensed-matter-phenomena
#9
Audrey Cottet, Matthieu C Dartiailh, Matthieu M Desjardins, Tino Cubaynes, Lauriane C Contamin, Matthieu Delbecq, Jérémie J Viennot, Laure E Bruhat, Benoit Douçot, Takis Kontos
Circuit QED techniques have been instrumental in manipulating and probing with exquisite sensitivity the quantum state of superconducting quantum bits coupled to microwave cavities. Recently, it has become possible to fabricate new devices in which the superconducting quantum bits are replaced by hybrid mesoscopic circuits combining nanoconductors and metallic reservoirs. This mesoscopic QED provides a new experimental playground to study the light-matter interaction in electronic circuits. Here, we present the experimental state of the art of mesoscopic QED and its theoretical description...
September 19, 2017: Journal of Physics. Condensed Matter: An Institute of Physics Journal
https://www.readbyqxmd.com/read/28924629/a-psma-ligand-labeled-with-cobalt-55-for-pet-imaging-of-prostate-cancer
#10
Johan Hygum Dam, Birgitte Brinkmann Olsen, Christina Baun, Poul Flemming Høilund-Carlsen, Helge Thisgaard
PURPOSE: Prostate-specific membrane antigen (PSMA) comprises a recognized target for molecular imaging of prostate cancer. As such, radiolabeled PSMA inhibitors are of great value for diagnosis and staging of this disease. Herein, we disclose the preclinical characterization of [(55)Co]PSMA-617 for positron emission tomography (PET)/x-ray computed tomography (CT) imaging of prostate cancer lesions. PROCEDURES: By the application of microwave heating, PSMA-617 in acetate buffer (0...
September 18, 2017: Molecular Imaging and Biology: MIB: the Official Publication of the Academy of Molecular Imaging
https://www.readbyqxmd.com/read/28924173/interfacial-origin-of-the-magnetisation-suppression-of-thin-film-yttrium-iron-garnet
#11
A Mitra, O Cespedes, Q Ramasse, M Ali, S Marmion, M Ward, R M D Brydson, C J Kinane, J F K Cooper, S Langridge, B J Hickey
Yttrium iron garnet has a very high Verdet constant, is transparent in the infrared and is an insulating ferrimagnet leading to its use in optical and magneto-optical applications. Its high Q-factor has been exploited to make resonators and filters in microwave devices, but it also has the lowest magnetic damping of any known material. In this article we describe the structural and magnetic properties of single crystal thin-film YIG where the temperature dependence of the magnetisation reveals a decrease in the low temperature region...
September 18, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28923737/enhancing-the-microwave-absorption-properties-of-amorphous-coo-nanosheet-coated-co-hexagonal-and-cubic-phases-through-interfacial-polarizations
#12
Jiushuai Deng, Shimei Li, Yuanyuan Zhou, Luyang Liang, Biao Zhao, Xi Zhang, Rui Zhang
Core-shell flower-like composites were successfully prepared by a simple polyol method. These composites were formed by coating dual-phased (face-centered cubic [fcc] and hexagonal close-packed [hcp]) Co with amorphous CoO nanosheets. The microwave absorption properties of the flower-like Co@CoO paraffin composites with various Co@CoO amounts were then investigated. Results showed that the paraffin-based composite containing 70wt% flower-like Co@CoO displayed excellent microwave absorption properties (RE=24...
September 8, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28923716/investigation-of-the-effect-of-pomegranate-extract-and-monodisperse-silver-nanoparticle-combination-on-mcf-7-cell-line
#13
Birgütay Şahin, Enes Demir, Ayşenur Aygün, Hülya Gündüz, Fatih Şen
In this study, we aimed to investigate whether the combination therapy of pomegranate extract and silver nanoparticle is effective on MCF-7 cell culture. The pomegranate extract was mixed and incubated with silver nitrate for the microwave assisted green synthesized of silver nanoparticle. Obtained nanoparticles were investigated using X-ray diffraction (XRD), Fourier Transform Infrared Spectroscopy (FTIR), UV-visible, Field Emission Scanning Electron Microscopy (FESEM), and Transmission Electron Microscopy (TEM) methods The spectroscopic and morphological studies of the monodisperse Ag NPs which have particle size of 15...
September 15, 2017: Journal of Biotechnology
https://www.readbyqxmd.com/read/28922946/temperature-simulation-of-microwave-ablation-based-on-improved-specific-absorption-rate-method-compared-to-phantom-measurements
#14
Hongjian Gao, Shuicai Wu, Xiaoru Wang, Rui Hu, Zhuhuang Zhou, Xuecong Sun
PURPOSE: To propose an improved specific absorption rate (SAR) computation method by incorporating a thermal conductivity item, develop mathematical simulation models based on the SAR, and enhance the accuracy of temperature simulation for 2450-MHz microwave fields. MATERIALS AND METHODS: Experimental data of 2450-MHz microwave antenna were obtained with a phantom and then new SAR equations were calculated according to Pennes bio-heat transfer equation. Next, the SAR equations were regarded as heating sources and SAR-derived temperature changes were simulated numerically; Finally, temperature measurement results were compared with simulation data to validate the accuracy of the new SAR method...
September 18, 2017: Computer Assisted Surgery (Abingdon, England)
https://www.readbyqxmd.com/read/28922111/optimization-of-the-working-conditions-for-magnetic-nanoparticle-enhanced-microwave-diagnostics-of-breast-cancer
#15
Gennaro Bellizzi, Gennaro G Bellizzi, Ovidio M Bucci, Lorenzo Crocco, Marko Helbig, Sebastian Ley, Juergen Sachs
Magnetic nanoparticle-aided microwave imaging is recently gaining an increasing interest as potential tool for breast cancer diagnostics. This is due to the peculiar features of magnetic nanoparticles, which are biocompatible, can be selectively targeted to the tumor and may change their microwave magnetic response when modulated by a polarizing magnetic field. This latter aspect is particularly appealing, as it enables the physical separation of the microwave signal due the malignancy, targeted by the nanoparticles, from that due to healthy tissue...
September 18, 2017: IEEE Transactions on Bio-medical Engineering
https://www.readbyqxmd.com/read/28921945/multiwalled-carbon-nanotubes-dramatically-affect-the-fruit-metabolome-of-exposed-tomato-plants
#16
Diamond L McGehee, Mohamed H Lahiani, Fahmida Irin, Micah J Green, Mariya V Khodakovskaya
Here, we reported that multiwalled carbon nanotubes (MWCNT) added to hydroponics system can enhance fruit production of exposed tomato plants. We quantified the exact amount of MWCNT accumulated inside of fruits collected by MWCNT-exposed plants using an advanced microwave induced heating technique (MIH). We found that absorption of MWCNT by tomato fruits significantly affected total fruit metabolome as was confirmed by LC-MS. Our data highlight the importance of comprehensive toxicological risk assessment of plants contaminated with carbon nanomaterials...
September 18, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28921588/integrating-prior-information-into-microwave-tomography-part-2-impact-of-errors-in-prior-information-on-microwave-tomography-image-quality
#17
Douglas Kurrant, Anastasia Baran, Joe LoVetri, Elise Fear
PURPOSE: The authors have developed a method to combine a patient-specific map of tissue structure and average dielectric properties with microwave tomography. The patient-specific map is acquired with radar-based techniques and serves as prior information for microwave tomography. The impact that the degree of structural detail included in this prior information has on image quality was reported in a previous investigation. The aim of the present study is to extend this previous work by identifying and quantifying the impact that errors in the prior information have on image quality, including the reconstruction of internal structures and lesions embedded in fibroglandular tissue...
September 17, 2017: Medical Physics
https://www.readbyqxmd.com/read/28921580/integrating-prior-information-into-microwave-tomography-part-1-impact-of-detail-on-image-quality
#18
Douglas Kurrant, Anastasia Baran, Joe LoVetri, Elise Fear
PURPOSE: The authors investigate the impact that incremental increases in the level of detail of patient-specific prior information have on image quality and the convergence behavior of an inversion algorithm in the context of near-field microwave breast imaging. A methodology is presented that uses image quality measures to characterize the ability of the algorithm to reconstruct both internal structures and lesions embedded in fibroglandular tissue. The approach permits key aspects that impact the quality of reconstruction of these structures to be identified and quantified...
September 17, 2017: Medical Physics
https://www.readbyqxmd.com/read/28920126/high-energy-product-chemically-synthesized-exchange-coupled-nd2fe14b-%C3%AE-fe-magnetic-powders
#19
Harshida Parmar, T Xiao, V Chaudhary, Y Zhong, R V Ramanujan
The excellent hard magnetic properties of Nd2Fe14B based magnets have an enormous range of technological applications. Exchange-coupled Nd2Fe14B/α-Fe magnets were chemically synthesized by a microwave assisted combustion process to produce mixed oxides, followed by a reduction diffusion process to form magnetic nano-composite powder. This synthesis technique offers an inexpensive and facile platform to produce exchange coupled hard magnets. The size dependent magnetic properties were investigated. The formation mechanisms of the oxide powders and the reduction diffusion mechanism were identified...
September 18, 2017: Nanoscale
https://www.readbyqxmd.com/read/28919740/low-toxic-maghemite-nanoparticles-for-theranostic-applications
#20
Elena A Kuchma, Peter V Zolotukhin, Anna A Belanova, Mikhail A Soldatov, Tatiana A Lastovina, Stanislav P Kubrin, Anatoliy V Nikolsky, Lidia I Mirmikova, Alexander V Soldatov
BACKGROUND: Iron oxide nanoparticles have numerous and versatile biological properties, ranging from direct and immediate biochemical effects to prolonged influences on tissues. Most applications have strict requirements with respect to the chemical and physical properties of such agents. Therefore, developing rational design methods of synthesis of iron oxide nanoparticles remains of vital importance in nanobiomedicine. METHODS: Low toxic superparamagnetic iron oxide nanoparticles (SPIONs) for theranostic applications in oncology having spherical shape and maghemite structure were produced using the fast microwave synthesis technique and were fully characterized by several complementary methods (transmission electron microscopy [TEM], X-ray diffraction [XRD], dynamic light scattering [DLS], X-ray photoelectron spectroscopy [XPS], X-ray absorption near edge structure [XANES], Mossbauer spectroscopy, and HeLa cells toxicity testing)...
2017: International Journal of Nanomedicine
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