keyword
MENU ▼
Read by QxMD icon Read
search

Microwave

keyword
https://www.readbyqxmd.com/read/28813061/indole-synthesis-by-palladium-catalyzed-tandem-allylic-isomerization-furan-diels-alder-reaction
#1
Jie Xu, Peter Wipf
A Pd(0)-catalyzed elimination of an allylic acetate generates a π-allyl complex that is postulated to initiate a novel intramolecular Diels-Alder cycloaddition to a tethered furan (IMDAF). Under the reaction conditions, this convergent, microwave-accelerated cascade process provides substituted indoles in moderate to good yields after Pd-hydride elimination, aromatization by dehydration, and in situ N-Boc cleavage.
August 16, 2017: Organic & Biomolecular Chemistry
https://www.readbyqxmd.com/read/28812661/human-population-growth-offsets-climate-driven-increase-in-woody-vegetation-in-sub-saharan-africa
#2
Martin Brandt, Kjeld Rasmussen, Josep Peñuelas, Feng Tian, Guy Schurgers, Aleixandre Verger, Ole Mertz, John R B Palmer, Rasmus Fensholt
The rapidly growing human population in sub-Saharan Africa generates increasing demand for agricultural land and forest products, which presumably leads to deforestation. Conversely, a greening of African drylands has been reported, but this has been difficult to associate with changes in woody vegetation. There is thus an incomplete understanding of how woody vegetation responds to socio-economic and environmental change. Here we used a passive microwave Earth observation data set to document two different trends in land area with woody cover for 1992-2011: 36% of the land area (6,870,000 km(2)) had an increase in woody cover largely in drylands, and 11% had a decrease (2,150,000 km(2)), mostly in humid zones...
March 6, 2017: Nature ecology & evolution
https://www.readbyqxmd.com/read/28812344/in-vitro-bile-acid-binding-capacities-of-red-leaf-lettuce-and-cruciferous-vegetables
#3
Isabelle Yang, Guddadarangavvanahal Jayaprakasha, Bhimanagouda S Patil
In the present study, we tested the bile acid binding capacity of red leaf lettuce, red cabbage, red kale, green kale, and Brussels sprouts in vitro digestion process by simulating mouth, gastric, and intestinal digestion using six bile acids at physiological pH. Green and red kale exhibited significantly higher (86.5±2.9 and 89.7±0.9%) bile acid binding capacity compared with the other samples. Further, three different compositions of bile acids were tested to understand the effect on different health conditions...
August 16, 2017: Journal of Agricultural and Food Chemistry
https://www.readbyqxmd.com/read/28812002/image-guided-thermal-ablation-with-mr-based-thermometry
#4
REVIEW
Mingming Zhu, Ziqi Sun, Chin K Ng
Thermal ablation techniques such as radiofrequency, microwave, high intensity focused ultrasound (HIFU) and laser have been used as minimally invasive strategies for the treatment of variety of cancers. MR thermometry methods are readily available for monitoring thermal distribution and deposition in real time, leading to decrease of incidents of normal tissue damage around targeted lesion. HIFU and laser-induced thermal therapy (LITT) are the two widely accepted tumor ablation techniques because of their compatibility with MR systems...
June 2017: Quantitative Imaging in Medicine and Surgery
https://www.readbyqxmd.com/read/28811888/performance-test-and-verification-of-an-off-the-shelf-automated-avian-radar-tracking-system
#5
Roel May, Yngve Steinheim, Pål Kvaløy, Roald Vang, Frank Hanssen
Microwave radar is an important tool for observation of birds in flight and represents a tremendous increase in observation capability in terms of amount of surveillance space that can be covered at relatively low cost. Based on off-the-shelf radar hardware, automated radar tracking systems have been developed for monitoring avian movements. However, radar used as an observation instrument in biological research has its limitations that are important to be aware of when analyzing recorded radar data. This article describes a method for exploring the detection capabilities of a dedicated short-range avian radar system used inside the operational Smøla wind-power plant...
August 2017: Ecology and Evolution
https://www.readbyqxmd.com/read/28811144/microwave-induced-plasma-for-solid-fuels-and-waste-processing-a-review-on-affecting-factors-and-performance-criteria
#6
REVIEW
Guan Sem Ho, Hasan Mohd Faizal, Farid Nasir Ani
High temperature thermal plasma has a major drawback which consumes high energy. Therefore, non-thermal plasma which uses comparatively lower energy, for instance, microwave plasma is more attractive to be applied in gasification process. Microwave-induced plasma gasification also carries the advantages in terms of simplicity, compactness, lightweight, uniform heating and the ability to operate under atmospheric pressure that gains attention from researchers. The present paper synthesizes the current knowledge available for microwave plasma gasification on solid fuels and waste, specifically on affecting parameters and their performance...
August 12, 2017: Waste Management
https://www.readbyqxmd.com/read/28810124/ferroelectric-phase-transition-induced-a-large-fmr-tuning-in-self-assembled-batio3-y3fe5o12-multiferroic-composites
#7
Guohua Dong, Ziyao Zhou, Xu Xue, Yijun Zhang, Bin Peng, Mengmeng Guan, Shishun Zhao, Zhongqiang Hu, Wei Ren, Zuo-Guang Ye, Ming Liu
Yttrium iron garnet (YIG) is of great importance in RF/microwave devices for its low loss, low intrinsic damping and high permeability. Nevertheless, tuning of YIG based multiferroics is still a challenge due to its near zero magnetostriction and the difficulty of building epitaxial interface between ferromagnetic garnet and ferroelectric perovskite phases. In this work, the vertical aligned heterostructure of YIG:BTO/STO(001) with local epitaxial interface between BTO and YIG is well-constructed, where the single crystal BTO pillars are embedded in YIG matrix...
August 15, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28809902/tunable-low-phase-noise-microwave-signals-from-an-optically-injected-semiconductor-laser-with-opto-electronic-feedback
#8
Joseph S Suelzer, Thomas B Simpson, Preetpaul Devgan, Nicholas G Usechak
We experimentally demonstrate the generation of microwave signals with linewidths below 3 Hz and a tuning range over 35 GHz from a semiconductor laser subject to optical injection and opto-electronic feedback. The feedback loop uses neither a microwave spectral filter nor an amplifier to achieve a reduction in the microwave linewidth of six orders of magnitude. Two microwave frequencies, 25.4 and 45.9 GHz, are chosen to highlight single-sideband phase measurements of -105 and -95  dBc/Hz at a 10-kHz offset, respectively...
August 15, 2017: Optics Letters
https://www.readbyqxmd.com/read/28809823/non-equilibrium-microwave-plasma-for-efficient-high-temperature-chemistry
#9
Dirk van den Bekerom, Niek den Harder, Teofil Minea, Nicola Gatti, Jose Palomares Linares, Waldo Bongers, Richard van de Sanden, Gerard van Rooij
A flowing microwave plasma based methodology for converting electric energy into internal and/or translational modes of stable molecules with the purpose of efficiently driving non-equilibrium chemistry is discussed. The advantage of a flowing plasma reactor is that continuous chemical processes can be driven with the flexibility of startup times in the seconds timescale. The plasma approach is generically suitable for conversion/activation of stable molecules such as CO2, N2 and CH4. Here the reduction of CO2 to CO is used as a model system: the complementary diagnostics illustrate how a baseline thermodynamic equilibrium conversion can be exceeded by the intrinsic non-equilibrium from high vibrational excitation...
August 1, 2017: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/28807875/bioactive-isoflavones-from-pueraria-lobata-root-and-starch-different-extraction-techniques-and-carbonic-anhydrase-inhibition
#10
Andrei Mocan, Simone Carradori, Marcello Locatelli, Daniela Secci, Stefania Cesa, Adriano Mollica, Simona Riga, Andrea Angeli, Claudiu T Supuran, Christian Celia, Luisa Di Marzio
Kudzu, the dried root of an important edible plant (Pueraria lobata), is used in Traditional Chinese Medicine for the important nutritional value strictly related to its isoflavone derivatives. These compounds characterize the quality of kudzu contained in different preparations, as pharmaceutical ingredient as well as dietary/food supplement (e.g. starch). The optimization of the isoflavones recovery, monitored by HPLC-PDA, through different innovative and conventional extraction techniques, e.g. microwave-assisted, ultrasound-assisted and conventional extraction, represented a suitable challenge in food industry and natural products evaluation...
August 11, 2017: Food and Chemical Toxicology
https://www.readbyqxmd.com/read/28804530/evolution-of-reduced-graphene-oxide-sns2-hybrid-nanoparticle-electrodes-in-li-ion-batteries
#11
Mohammad H Modarres, Jonathan Hua-Wei Lim, Chandramohan George, Michael De Volder
Hybrid nanomaterials where active battery nanoparticles are synthesized directly onto conductive additives such as graphene hold the promise of improving the cyclability and energy density of conversion and alloying type Li-ion battery electrodes. Here we investigate the evolution of hybrid reduced graphene oxide-tin sulfide (rGO-SnS2) electrodes during battery cycling. These hybrid nanoparticles are synthesized by a one-step solvothermal microwave reaction which allows for simultaneous synthesis of the SnS2 nanocrystals and reduction of GO...
June 22, 2017: Journal of Physical Chemistry. C, Nanomaterials and Interfaces
https://www.readbyqxmd.com/read/28803099/renewable-platform-chemicals-from-directional-microwave-assisted-liquefaction-coupling-stepwise-extraction-of-waste-biomass
#12
Junfeng Feng, Chungyun Hse, Zhongzhi Yang, Kui Wang, Jianchun Jiang, Junming Xu
Directional microwave-assisted liquefaction and stepwise extraction are introduced for producing platform chemicals: aromatics and monosaccharides. When sulfuric acid was used as a catalyst, a 45% monosaccharides yield and a 29% aromatics yield were obtained from bamboo with 0.3g catalyst per 18g methanol and 2g bamboo at 160°C with 10min. Approximately 78-86wt% of the six biomass materials were converted into liquid products. After the stepwise extraction and precipitation process, the yields of monosaccharide derivatives and three phenolic compound fractions were 39-45% and 28-32%, respectively...
August 3, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28803092/uniform-field-loop-gap-resonator-and-rectangular-teu02-for-aqueous-sample-epr-at-94ghz
#13
Jason W Sidabras, Tadeusz Sarna, Richard R Mett, James S Hyde
In this work we present the design and implementation of two uniform-field resonators: a seven-loop-six-gap loop-gap resonator (LGR) and a rectangular TEU02 cavity resonator. Each resonator has uniform-field-producing end-sections. These resonators have been designed for electron paramagnetic resonance (EPR) of aqueous samples at 94GHz. The LGR geometry employs low-loss Rexolite end-sections to improve the field homogeneity over a 3mm sample region-of-interest from near-cosine distribution to 90% uniform. The LGR was designed to accommodate large degassable Polytetrafluorethylen (PTFE) tubes (0...
August 5, 2017: Journal of Magnetic Resonance
https://www.readbyqxmd.com/read/28802197/enhanced-electrochemical-performance-of-nickel-cobalt-oxide-reduced-graphene-oxide-activated-carbon-asymmetric-supercapacitors-by-the-addition-of-a-redox-active-electrolyte
#14
Charmaine Lamiel, Yong Rok Lee, Moo Hwan Cho, Dirk Tuma, Jae-Jin Shim
Supercapacitors are an emerging energy-storage system with a wide range of potential applications. In this study, highly porous nickel-cobalt-oxide@reduced graphene oxide (Ni-Co-O@RGO-s) nanosheets were synthesized as an active material for supercapacitors using a surfactant-assisted microwave irradiation technique. The RGO-modified nanocomposite showed a larger specific area, better conductivity, and lower resistivity than the unmodified nanocomposite because the RGO facilitated faster ion diffusion/transport for improved redox activity...
August 2, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28802017/volatile-composition-and-sensory-profile-of-shiitake-mushrooms-as-affected-by-drying-method
#15
Joanna Politowicz, Krzysztof Lech, Leontina Lipan, Adam Figiel, Ángel A Carbonell-Barrachina
BACKGROUND: One of the best preservation method for long-term storage is drying. In this work, the influence of different drying methods on aroma and sensory profile of shiitake mushroom was evaluated. The drying methods tested were: convective drying (CD), freeze-drying (FD), vacuum-microwave drying (VMD), and a combination of convective pre-drying and vacuum-microwave finish-drying (CPD-VMFD). RESULTS: The volatile composition of fresh and dried shiitake mushrooms was analyzed by SPME, GC-MS and GC-FID, and showed the presence of 71 volatile compounds, most of them present in all dried samples but with quantitative variation...
August 12, 2017: Journal of the Science of Food and Agriculture
https://www.readbyqxmd.com/read/28802001/a-simple-time-saving-microwave-assisted-periodic-acid-schiff%C3%A2-s-staining-of-glycoproteins-on-1d-electrophoretic-gels
#16
Jiri Moravec, Jan Mares
We introduce an optimized periodic acid - Schiff´s staining of glycoproteins on 1D electrophoretic gels. Thanks to heating in a household microwave oven the protocol of standard periodic acid - Schiff´s staining has been accelerated from 6 h to below 10 min employing standard chemistry. At the same time, we show that the microwave-assisted glycoprotein staining is at least as sensitive as the conventional approach. This article is protected by copyright. All rights reserved.
August 12, 2017: Electrophoresis
https://www.readbyqxmd.com/read/28800540/rapid-extraction-of-amomum-tsao-ko-essential-oil-and-determination-of-its-chemical-composition-antioxidant-and-antimicrobial-activities
#17
Qi Cui, Li-Tao Wang, Ju-Zhao Liu, Hui-Mei Wang, Na Guo, Cheng-Bo Gu, Yu-Jie Fu
A simple, green and efficient extraction method named modified-solvent free microwave extraction (M-SFME) was employed for the extraction of essential oils (EOs) from Amomun tsao-ko. The process of M-SFME was optimized with the prominent preponderance of such higher extraction yield (1.13%) than those of solvent free microwave extraction (SFME, 0.91%) and hydrodistillation (HD, 0.84%) under the optimal parameters. Thirty-four volatile substances representing 95.4% were identified. The IC50 values of EOs determined by DPPH radical scavenging activity and β-carotene/linoleic acid bleaching assay were 5...
August 3, 2017: Journal of Chromatography. B, Analytical Technologies in the Biomedical and Life Sciences
https://www.readbyqxmd.com/read/28799842/midterm-safety-and-efficacy-of-irreversible-electroporation-of-malignant-liver-tumors-located-close-to-major-portal-or-hepatic-veins
#18
Martina Distelmaier, Alexandra Barabasch, Philipp Heil, Nils A Kraemer, Peter Isfort, Sebastian Keil, Christiane K Kuhl, Philipp Bruners
Purpose To investigate the efficacy and safety of irreversible electroporation (IRE) in the treatment of hepatic tumors not suitable for thermal ablation (radiofrequency ablation [RFA] or microwave ablation). Materials and Methods This was an institutional review board-approved prospective study in 29 patients (15 men, 14 women; mean age, 63 years ± 12 [standard deviation]) with 43 primary (n = 8) or secondary (n = 35) malignant liver tumors who underwent computed tomography (CT)-guided IRE. All target tumors were located immediately adjacent to major hepatic veins, portal veins, or both; thus, they were not considered suitable for RFA or microwave ablation...
August 11, 2017: Radiology
https://www.readbyqxmd.com/read/28799792/effects-of-daily-food-processing-on-allergenicity
#19
Beatriz Cabanillas, Natalija Novak
Daily food processing has the potential to alter the allergenicity of foods due to modification of the physico-chemical properties of proteins. The degree of such modifications depends on factors such as processing conditions, type of food considered, allergenic content, etc. The impact of daily food processing like boiling, roasting, frying or baking on food allergenicity have been extensively studied. The influence of other thermal treatments such as microwave heating or pressure cooking on allergenicity has also been analyzed...
August 11, 2017: Critical Reviews in Food Science and Nutrition
https://www.readbyqxmd.com/read/28799651/thermal-mapping-on-male-genital-and-skin-tissues-of-laptop-thermal-sources-and-electromagnetic-interaction
#20
Mahdi Safari, Navid Mosleminiya, Ali Abdolali
Since the development of communication devices and expansion of their applications, there have been concerns about their harmful health effects. The main aim of this study was to investigate laptop thermal effects caused by exposure to electromagnetic fields and thermal sources simultaneously; propose a nondestructive, replicable process that is less expensive than clinical measurements; and to study the effects of positioning any new device near the human body in steady state conditions to ensure safety by U...
August 11, 2017: Bioelectromagnetics
keyword
keyword
44194
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"