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https://www.readbyqxmd.com/read/28107901/high-peroxidase-like-activity-of-iron-and-nitrogen-co-doped-carbon-dots-and-its-application-in-immunosorbent-assay
#1
Weiqiang Yang, TingTing Huang, Mengmeng Zhao, Fang Luo, Wen Weng, Qiaohua Wei, Zhenyu Lin, Guonan Chen
Herein, iron and nitrogen co-doped carbon dots (Fe-N-CDs) were synthesized through a solvothermal method assisting with the microwave synthesis system for the first time. Multiple techniques were employed to characterize the properties of the obtained particles. The emphasis of current work was the confirmation of their intrinsic peroxidase activity due to the Fe doping, which is similar to natural ferriporphyrin. Through catalyzing the oxidization of 3,3',5,5'-Tetramethylbenzidine (TMB) in the presence of H2O2, the Fe-N-CDs exhibited a superior catalytic performance over horseradish peroxidase (HRP), suggesting their potential applications in catalytic area...
March 1, 2017: Talanta
https://www.readbyqxmd.com/read/28107709/quantification-of-fatty-acids-in-the-muscle-of-antarctic-fish-trematomus-bernacchii-by-gas-chromatography-mass-spectrometry-optimization-of-the-analytical-methodology
#2
C Truzzi, S Illuminati, A Annibaldi, M Antonucci, G Scarponi
This work presents data on the quantification of fatty acids (FAs, in terms of mass unit per tissue weight) in the muscle of Trematomus bernacchii, a key species in Antarctica, often used as bioindicator for contamination studies. Modifications in fatty acids content should be considered a useful biomarker to study how contaminants affect Antarctic biota. Until now, very few studies quantified fatty acids of muscle of T. bernacchii, and only as percentage of a single fatty acid on total lipids. To perform the quantification of fatty acids, we used an analytical method based on a fast microwave-assisted extraction of lipids from a lyophilized sample, a base-catalyzed trans-esterification of lipid extract to obtain Fatty Acids Methyl Esters (FAMEs), and a separation and identification of FAMEs by gas chromatography-mass spectrometry...
December 31, 2016: Chemosphere
https://www.readbyqxmd.com/read/28107666/development-of-a-microwave-energy-delivery-system-for-reversible-stunning-of-cattle
#3
D McLean, L Meers, J Ralph, J S Owen, A Small
Stunning prior to slaughter is commonly used to render the animal insensible to pain. However, for certain markets, stunning is disallowed, unless the animal can fully recover if not slaughtered. There are very few available methods of inducing a fully recoverable stun. This paper describes the development of a microwave energy application system for stunning cattle. Cadaver heads were used to demonstrate that brain temperature could be raised to a point at which insensibility would be expected to occur (44°C), and to calculate the power and time combinations required to achieve this in a range of cattle weights...
January 7, 2017: Research in Veterinary Science
https://www.readbyqxmd.com/read/28107618/carbon-hollow-microspheres-with-a-designable-mesoporous-shell-for-high-performance-electromagnetic-wave-absorption
#4
Hailong Xu, Xiaowei Yin, Meng Zhu, Meikang Han, Zexin Hou, Xinliang Li, Litong Zhang, Laifei Cheng
In this work, mesoporous carbon hollow microspheres (PCHMs) with designable mesoporous shell and interior void are constructed by a facile in situ stöber templating approach and a pyrolysis-etching process. The PCHMs are characterized by scanning electron microscopy, transmission electron microscopy, X-ray photoelectron spectra, Raman, nitrogen adsorption and desorption system. A uniform mesoporous shell (pore size 4.7 nm) with a thickness of 55 nm and a cavity size of 345 nm is realized. The composite of paraffin mixed with 20 wt...
January 20, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28106986/microwave-assisted-synthesis-of-nacopo4-red-phase-and-initial-characterization-as-high-voltage-cathode-for-sodium-ion-batteries
#5
Arturo Gutierrez, Soojeong Kim, Timothy T Fister, Christopher S Johnson
Transition metal-containing polyanion compounds are attractive for use as cathode materials in sodium-ion batteries (SIB) because they possess elevated higher intrinsic electrochemical potentials versus oxide analogs given the same M(n+/(n+1)+) redox couple, which leads to higher energy densities. NaMPO4 (M = transition metal) compounds have a driving force to form into the electrochemically inactive maricite phase when using conventional methods. Herein we report on the synthesis of a NaCoPO4 (NCP) polymorph ("Red"-phase) by a microwave-assisted solvothermal process at 200 °C using tetraethylene glycol as the solvent...
January 20, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28106822/red-fruits-extraction-of-antioxidants-phenolic-content-and-radical-scavenging-determination-a-review
#6
REVIEW
Gádor-Indra Hidalgo, María Pilar Almajano
Red fruits, as rich antioxidant foods, have gained over recent years capital importance for consumers and manufacturers. The industrial extraction of the phenolic molecules from this source has been taking place with the conventional solvent extraction method. New non-conventional extraction methods have been devised as environmentally friendly alternatives to the former method, such as ultrasound, microwave, and pressure assisted extractions. The aim of this review is to compile the results of recent studies using different extraction methodologies, identify the red fruits with higher antioxidant activity, and give a global overview of the research trends regarding this topic...
January 19, 2017: Antioxidants (Basel, Switzerland)
https://www.readbyqxmd.com/read/28106421/breaking-of-galilean-invariance-in-the-hydrodynamic-formulation-of-ferromagnetic-thin-films
#7
Ezio Iacocca, T J Silva, Mark A Hoefer
Microwave magnetodynamics in ferromagnets are often studied in the small-amplitude or weakly nonlinear regime corresponding to modulations of a well-defined magnetic state. However, strongly nonlinear regimes, where the aforementioned approximations are not applicable, have become experimentally accessible. By reinterpreting the governing Landau-Lifshitz equation of motion, we derive an exact set of equations of dispersive hydrodynamic form that are amenable to analytical study even when full nonlinearity and exchange dispersion are included...
January 6, 2017: Physical Review Letters
https://www.readbyqxmd.com/read/28106214/copper-nanoparticle-interspersed-mos2-nanoflowers-with-enhanced-efficiency-for-co2-electrochemical-reduction-to-fuel
#8
Guodong Shi, Luo Yu, Xin Ba, Xiaoshu Zhang, Jianqing Zhou, Ying Yu
Electrocatalytic conversion of carbon dioxide (CO2) has been considered as an ideal method to simultaneously solve the energy crisis and environmental issue around the world. In this work, ultrasmall Cu nanoparticle interspersed flower-like MoS2 was successfully fabricated via a facile microwave hydrothermal method. The designed optimal hierarchical Cu/MoS2 composite not only exhibited remarkably enhanced electronic conductivity and specific surface area but also possessed improved CO2 adsorption capacity, resulting in a significant increase in overall faradaic efficiency and a 7-fold augmentation of the faradaic efficiency of CH4 in comparison with bare MoS2...
January 20, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/28106185/direct-mapping-of-the-electric-permittivity-of-heterogeneous-non-planar-thin-films-at-gigahertz-frequencies-by-scanning-microwave-microscopy
#9
Maria Chiara Biagi, Giorgio Badino, Rene Fabregas, Georg Gramse, Laura Fumagalli, Gabriel Gomila
We obtained maps of electric permittivity at ∼19 GHz frequencies on non-planar thin film heterogeneous samples by means of combined atomic force-scanning microwave microscopy (AFM-SMM). We show that the electric permittivity maps can be obtained directly from the capacitance images acquired in contact mode, after removing the topographic cross-talk effects. This result demonstrates the possibility of identifying the electric permittivity of different materials in a thin film sample irrespectively of their thickness by just direct imaging and processing...
January 20, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28106115/broadband-unidirectional-behavior-of-electromagnetic-waves-based-on-transformation-optics
#10
XiaoFei Zang, YiMing Zhu, XueBin Ji, Lin Chen, Qing Hu, SongLin Zhuang
High directive antennas are fundamental elements for microwave communication and information processing. Here, inspired by the method of transformation optics, we propose and demonstrate a transformation medium to control the transmission path of a point source, resulting in the unidirectional behavior of electromagnetic waves (directional emitter) without any reflectors. The network of inductor-capacitor transmission lines is designed to experimentally realize the transformation medium. Furthermore, the designed device can work in a broadband frequency range...
January 20, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28103953/microwave-ablation-is-as-effective-as-radiofrequency-ablation-for-very-early-stage-hepatocellular-carcinoma
#11
Yun Xu, Qiang Shen, Neng Wang, Pan-Pan Wu, Bin Huang, Ming Kuang, Guo-Jun Qian
BACKGROUND: Percutaneous radiofrequency ablation (RFA) is a first-line treatment for very-early-stage hepatocellular carcinoma (HCC), whereas the efficacy of percutaneous microwave ablation (MWA) for very-early-stage HCC remains unclear. The purpose of this study was to clarify this issue by comparing the safety and efficacy of percutaneous MWA with percutaneous RFA in treating very-early-stage HCC. METHODS: Clinical data of 460 patients who were diagnosed with very-early-stage HCC and treated with percutaneous MWA or RFA between January 2007 and July 2012 at the Eastern Hepatobiliary Surgery Hospital, The Second Military Medical University, in Shanghai, China were retrospectively analyzed...
January 19, 2017: Chinese Journal of Cancer
https://www.readbyqxmd.com/read/28103487/a-turn-on-thiol-functionalized-fluorescent-carbon-quantum-dot-based-chemosensory-system-for-arsenite-detection
#12
Pooja D, Sonia Saini, Anupma Thakur, Baban Kumar, Sachin Tyagi, Manoj K Nayak
Carbon quantum dots (CQDs) have emerged out as promising fluorescent probes for hazardous heavy metals detection in recent past. In this study, water soluble CQDs were synthesized by facile microwave pyrolysis of citric acid & cysteamine, and functionalized with ditheritheritol to impart thiol functionalities at surface for selective detection of toxic arsenite in water. Microscopic analysis reveals that the synthesized CQDs are of uniform size (diameter ∼5nm) and confirmed to have surface SH groups by FT-IR...
January 12, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28103194/optical-stabilization-of-a-microwave-oscillator-for-fountain-clock-interrogation
#13
Burghard Lipphardt, Vladislav Gerginov, Stefan Weyers
We describe an optical frequency stabilization scheme of a microwave oscillator that is used for the interrogation of primary caesium fountain clocks. Because of its superior phase noise properties, this scheme, which is based on an ultrastable laser and a femtosecond laser frequency comb, overcomes the frequency instability limitations of fountain clocks given by the previously utilized quartz-oscillator-based frequency synthesis. The presented scheme combines the transfer of the short-term frequency instability of an optical cavity and the long-term frequency instability of a hydrogen maser to the microwave oscillator and is designed to provide continuous long-term operation for extended measurement periods of several weeks...
January 5, 2017: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
https://www.readbyqxmd.com/read/28102407/introducing-tetramethylurea-as-a-new-methylene-precursor-a-microwave-assisted-rucl3-catalyzed-cross-dehydrogenative-coupling-approach-to-bis-indolyl-methanes
#14
Mohit L Deb, Paran J Borpatra, Prakash J Saikia, Pranjal K Baruah
Herein we report a microwave assisted Ru(iii)/TBHP-mediated reaction of indoles with tetramethylurea (TMU) synthesizing symmetrical as well as unsymmetrical bis(indolyl)methanes, where TMU acts as a methylenating agent. This is the first report where TMU is used as a methylene source. Moreover, the synthesis of unsymmetrical bis(indolyl)methanes by using a carbon precursor is also reported herein for the first time. Various substituted indoles are used for the reaction. The reaction is high yielding and takes a much shorter time to accomplish compared to the existing methods...
January 19, 2017: Organic & Biomolecular Chemistry
https://www.readbyqxmd.com/read/28102239/subcycle-quantum-electrodynamics
#15
C Riek, P Sulzer, M Seeger, A S Moskalenko, G Burkard, D V Seletskiy, A Leitenstorfer
Squeezed states of electromagnetic radiation have quantum fluctuations below those of the vacuum field. They offer a unique resource for quantum information systems and precision metrology, including gravitational wave detectors, which require unprecedented sensitivity. Since the first experiments on this non-classical form of light, quantum analysis has been based on homodyning techniques and photon correlation measurements. These methods currently function in the visible to near-infrared and microwave spectral ranges...
January 18, 2017: Nature
https://www.readbyqxmd.com/read/28102178/fast-synthesis-of-ultrathin-zno-nanowires-by-oxidation-of-cu-zn-stacks-in-low-pressure-afterglow
#16
A Altaweel, A Imam, J Ghanbaja, D Mangin, P Miska, T Gries, T Belmonte
The synthesis of ultrathin, single-crystalline zinc oxide nanowires was achieved by treating in a flowing microwave plasma oxidation process, zinc films coated beforehand by a sputtered thin buffer layer of copper. The aspect ratio of the nanowires can be controlled by the following experimental parameters: treatment duration, furnace temperature, oxygen concentration. An average diameter of 6 nm correlated with a mean length of 750 nm can be reached with a fairly high surface number density for very short treatments, typically less than 1 min...
January 19, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28102018/microwave-assisted-rapid-synthesis-of-self-assembled-t-nb2o5-nanowires-for-high-energy-hybrid-supercapacitors
#17
Huiling Yang, Henghui Xu, Libin Wang, Lei Zhang, Yunhui Huang, Xianluo Hu
Recently ion-intercalation hybrid supercapacitors with high energy density at high power density have been widely investigated to meet the ever-increasing practical applications. Here a unique hybrid supercapacitor is designed and fabricated using self-assembled orthorhombic-phase niobium oxide@carbon (T-Nb2O5@C) nanowires as an anode and commercially available activated carbon as a cathode. The 3D-interconnected T-Nb2O5@C nanowires have been synthesized via a highly efficient microwave-solvothermal method combined with subsequent thermal treatment...
January 19, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28101853/investigation-on-the-effects-of-the-formation-of-a-silver-flower-like-structure-on-graphene
#18
Rozalina Zakaria, Siti Fatimah Az Zahra Yusoff, Kok Chung Law, Chin Seong Lim, Harith Ahmad
In this report, we experimentally investigate the formation of "flower-like silver structures" on graphene. Using an electrochemical deposition technique with deposition times of 2.5 and 5 min, agglomerations of silver nanoparticles (AgNPs) were deposited on the graphene surfaces, causing the formation of "flower-like structures" on the graphene substrate. Localized surface plasmon resonance (LSPR) was observed in the interaction between the structures and the graphene substrate. The morphology of the samples was observed using a field-emission scanning electron microscope (FESEM) and Raman spectroscopy...
December 2017: Nanoscale Research Letters
https://www.readbyqxmd.com/read/28101682/synthesis-spectral-and-extended-spectrum-beta-lactamase-studies-of-transition-metal-tetraaza-macrocyclic-complexes
#19
Dinesh Kumar, Nutan Sharma, Manjula Nair
Urinary tract infections commonly occur in humans due to microbial pathogens invading the urinary tract, which can bring about a range of clinical symptoms and potentially fatal sequelae. The present study is aimed at addressing the development of a new antimicrobial agent against extended spectrum beta lactamase (ESBL) producing E. coli bacteria. We have synthesised some biologically potent (NNNN) donor macrocycles (L 1  = dibenzo[f,n]dipyrido[3,4-b:4',3'-j][1,4,9,12]tetraazacyclohexadecine-6,11,18,23(5H,12H, 7H, 24H)-tetraone, and L 2  = 6,12,19,25-tetraoxo-4,6,11,12,16,18,23,24-octahydrotetrabenzo [b,g,k,p][1,5,10,14]tetra azacyclooctadecine-2,13-dicarboxylic acid) and their Ti and Zr metal complexes in alcoholic media using microwave protocol...
January 18, 2017: Journal of Biological Inorganic Chemistry: JBIC
https://www.readbyqxmd.com/read/28100826/biomechanical-properties-of-wheat-grains-the-implications-on-milling
#20
James E Hourston, Michael Ignatz, Martin Reith, Gerhard Leubner-Metzger, Tina Steinbrecher
Millennia of continuous innovation have driven ever increasing efficiency in the milling process. Mechanically characterizing wheat grains and discerning the structure and function of the wheat bran layers can contribute to continuing innovation. We present novel shear force and puncture force testing regimes to characterize different wheat grain cultivars. The forces endured by wheat grains during the milling process can be quantified, enabling us to measure the impact of commonly applied grain pretreatments, such as microwave heating, extended tempering, enzyme and hormone treatments on grains of different 'hardness'...
January 2017: Journal of the Royal Society, Interface
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