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https://www.readbyqxmd.com/read/28544494/4-substituted-thieno-2-3-d-pyrimidines-as-potent-antibacterial-agents-rational-design-microwave-assisted-synthesis-biological-evaluation-and-molecular-docking-studies
#1
Rupinder K Gill, Harpreet Singh, Tilak Raj, Anuradha Sharma, Gagandeep Singh, Jitender Bariwal
In an attempt to discover a new class of antibacterial agents with improved efficacy and to overcome the drug resistant problems, some novel 4-substituted thieno[2,3-d]pyrimidines have been synthesized via microwave assisted methodology and evaluated for their in vitro antibacterial activity against various pathogenic bacterial strains. Compounds 12b and 13c showed the promising inhibitory potencies against S. aureus, B. subtilis, P. aeruginosa and E. coli with MICs ranging from 2 to 10 μg/ml. Compound 13c was also found to be highly potent against methicillin resistant S...
May 23, 2017: Chemical Biology & Drug Design
https://www.readbyqxmd.com/read/28544485/preservation-of-surface-conductivity-and-dielectric-loss-tangent-in-large-scale-encapsulated-epitaxial-graphene-measured-by-noncontact-microwave-cavity-perturbations
#2
Albert F Rigosi, Nicholas R Glavin, Chieh-I Liu, Yanfei Yang, Jan Obrzut, Heather M Hill, Jiuning Hu, Hsin-Yen Lee, Angela R Hight Walker, Curt A Richter, Randolph E Elmquist, David B Newell
Regarding the improvement of current quantized Hall resistance (QHR) standards, one promising avenue is the growth of homogeneous monolayer epitaxial graphene (EG). A clean and simple process is used to produce large, precise areas of EG. Properties like the surface conductivity and dielectric loss tangent remain unstable when EG is exposed to air due to doping from molecular adsorption. Experimental results are reported on the extraction of the surface conductivity and dielectric loss tangent from data taken with a noncontact resonance microwave cavity, assembled with an air-filled, standard R100 rectangular waveguide configuration...
May 19, 2017: Small
https://www.readbyqxmd.com/read/28544389/bimetal-organic-framework-derivation-of-ball-cactus-like-ni-sn-p-c-cnt-as-long-cycle-anode-for-lithium-ion-battery
#3
Ruoling Dai, Weiwei Sun, Li-Ping Lv, Minghong Wu, Hao Liu, Guoxiu Wang, Yong Wang
Metal phosphides are a new class of potential high-capacity anodes for lithium ion batteries, but their short cycle life is the critical problem to hinder its practical application. A unique ball-cactus-like microsphere of carbon coated NiP2 /Ni3 Sn4 with deep-rooted carbon nanotubes (Ni-Sn-P@C-CNT) is demonstrated in this work to solve this problem. Bimetal-organic-frameworks (BMOFs, Ni-Sn-BTC, BTC refers to 1,3,5-benzenetricarboxylic acid) are formed by a two-step uniform microwave-assisted irradiation approach and used as the precursor to grow Ni-Sn@C-CNT, Ni-Sn-P@C-CNT, yolk-shell Ni-Sn@C, and Ni-Sn-P@C...
May 22, 2017: Small
https://www.readbyqxmd.com/read/28544164/rapid-production-of-high-purity-hydrogen-fuel-through-microwave-promoted-deep-catalytic-dehydrogenation-of-liquid-alkanes-with-abundant-metals
#4
Xiangyu Jie, Sergio Gonzalez-Cortes, Tiancun Xiao, Jiale Wang, Benzhen Yao, Daniel R Slocombe, Hamid A Al-Megren, Jonathan R Dilworth, John M Thomas, Peter P Edwards
Hydrogen as an energy carrier promises a sustainable energy revolution. However, one of the greatest challenges for any future hydrogen economy is the necessity for large scale hydrogen production not involving concurrent CO2 production. The high intrinsic hydrogen content of liquid-range alkane hydrocarbons (including diesel) offers a potential route to CO2 -free hydrogen production through their catalytic deep dehydrogenation. We report here a means of rapidly liberating high-purity hydrogen by microwave-promoted catalytic dehydrogenation of liquid alkanes using Fe and Ni particles supported on silicon carbide...
May 23, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28543913/from-ligand-to-phosphor-rapid-machine-assisted-syntheses-of-substituted-iridium-iii-pyrazolate-complexes-with-tuneable-luminescence
#5
Simon J Pope, Lara Groves, Christiane Schotten, Joseph Beames, James Platts, Duncan Browne, Simon Coles, Peter Horton
A first generation machine-assisted approach towards the preparation of hybrid ligand/metal materials has been explored. A comparison of synthetic approaches demonstrates that incorporation of both flow chemistry and microwave heating, can be successfully applied to the rapid synthesis of a range of new phenyl-1H-pyrazoles (ppz) substituted with electron withdrawing groups (-F, -CF3, -OCF3, -SF5), and these, in turn, can be translated in to heteroleptic complexes, [Ir(ppz)2(bipy)]BF4 (bipy = 2,2'-bipyridine)...
May 22, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28543820/design-synthesis-and-biological-evaluation-of-coumarin-triazole-hybrid-molecules-as-potential-antitumor-and-pancreatic-lipase-agents
#6
Bahittin Kahveci, Fatih Yılmaz, Emre Menteşe, Serdar Ülker
The design, synthesis, and investigation of antitumor and anti-lipase activities of some coumarin-triazole hybrid molecules are reported. The synthesis of these hybrid molecules was performed under microwave irradiation and conventional heating procedures. The newly synthesized hybrid molecules were investigated as inhibitors against four tumor cell lines (BT20 human breast carcinoma, SK-Mel 128 melanoma, DU-145 prostate carcinoma, and A549 lung carcinoma) and porcine pancreatic lipase (PPL). Most of these compounds showed notable antitumor activities against the tested tumor cell lines, and compounds 8i and 8l showed the best anti-lipase activity of 99...
May 22, 2017: Archiv der Pharmazie
https://www.readbyqxmd.com/read/28543540/computational-modeling-of-915-mhz-microwave-ablation-comparative-assessment-of-temperature-dependent-tissue-dielectric-models
#7
Garron Deshazer, Mark Hagmann, Derek Merck, Jan Sebek, Kent B Moore, Punit Prakash
PURPOSE: The objective of this study is to develop a computational model for simulating 915 MHz microwave ablation (MWA), and verify the simulation predictions of transient temperature profiles against experimental measurements. Due to the limited experimental data characterizing temperature-dependent changes of tissue dielectric properties at 915 MHz, we comparatively assess two temperature dependent approaches of modeling of dielectric properties: model A- piecewise linear temperature dependencies based on existing, but limited, experimental data, and model B- similar to model A, but augmented with linear decrease in electrical conductivity above 95 °C, as guided by our experimental measurements...
May 23, 2017: Medical Physics
https://www.readbyqxmd.com/read/28541947/methylene-blue-removal-using-a-low-cost-activated-carbon-adsorbent-from-tobacco-stems-kinetic-and-equilibrium-studies
#8
Bellington Mudyawabikwa, Henry H Mungondori, Lilian Tichagwa, David M Katwire
The aim of this study was to prepare activated carbon from tobacco stalks using microwave heating. The prepared activated carbon was applied as an adsorbent in methylene blue (MB) removal from water. The optimum conditions for activated carbon preparation were a radiation power of 280 W for a period of 6 minutes after the impregnation of the precursor material with 30% ZnCl2 for 24 hours. The activated carbon yield and iodine number were 49.43% and 1,264.51 mg/g respectively. The activated carbon also had a point of zero charge of 5...
May 2017: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/28540971/a-sialosyl-sulfonate-as-a-potent-inhibitor-of-influenza-virus-replication
#9
Ádám Hadházi, Mauro Pascolutti, Benjamin Bailly, Jeffrey C Dyason, Anikó Borbás, Robin J Thomson, Mark von Itzstein
A new direction for influenza virus sialidase inhibitor development was identified using a sulfonate congener of 2-deoxy-2-β-H N-acetylneuraminic acid. Sialosyl sulfonates can be synthesised efficiently in four steps from N-acetylneuraminic acid via a microwave assisted decarboxylation. The presence of the sulfonate group significantly increases inhibition of influenza virus sialidase and viral infection when compared to the carboxylate congener, and also to the benchmark sialidase inhibitor 2,3-dehydro-2-deoxy-N-acetylneuraminic acid, Neu5Ac2en...
May 25, 2017: Organic & Biomolecular Chemistry
https://www.readbyqxmd.com/read/28540822/clinical-and-survival-outcomes-of-percutaneous-microwave-ablation-for-intrahepatic-cholangiocarcinoma
#10
Kai Zhang, Jie Yu, Xiaoling Yu, Zhiyu Han, Zhigang Cheng, Fangyi Liu, Ping Liang
OBJECTIVE: To evaluate the outcomes of percutaneous microwave ablation (MWA) and explore the prognostic factors for the survival of patients with intrahepatic cholangiocarcinoma (ICC). METHODS: A total of 107 patients (age: mean 58.0 years, range 15-85 years) with 171 ICCs (maximum size ≤5 cm, tumour number per patient ≤3) who underwent MWA for ICC during January 2009 to February 2016 were selected, and their clinical and pathological data were collected and reviewed...
May 19, 2017: International Journal of Hyperthermia
https://www.readbyqxmd.com/read/28540805/the-in-vivo-performance-of-a-novel-thermal-accelerant-agent-used-for-augmentation-of-microwave-energy-delivery-within-biologic-tissues-during-image-guided-thermal-ablation-a-porcine-study
#11
William Keun Chan Park, Aaron Wilhelm Palmer Maxwell, Victoria Elizabeth Frank, Michael Patrick Primmer, Jarod Brian Paul, Scott Andrew Collins, Kara Anne Lombardo, Shaolei Lu, Tiffany Marie Borjeson, Grayson Luderman Baird, Damian Edward Dupuy
OBJECTIVES: To investigate the effects of a novel caesium-based thermal accelerant (TA) agent on ablation zone volumes following in vivo microwave ablation of porcine liver and skeletal muscle, and to correlate the effects of TA with target organ perfusion. MATERIALS AND METHODS: This prospective study was performed following institutional animal care and use committee approval. Microwave ablation was performed in liver and resting skeletal muscle in eight Sus scrofa domesticus swine following administration of TA at concentrations of 0 mg/mL (control), 100 mg/mL and 250 mg/mL...
April 24, 2017: International Journal of Hyperthermia
https://www.readbyqxmd.com/read/28540791/ablation-therapy-of-non-colorectal-cancer-lung-metastases-retrospective-analysis-of-tumour-response-post-laser-induced-interstitial-thermotherapy-litt-radiofrequency-ablation-rfa-and-microwave-ablation-mwa
#12
Nour-Eldin A Nour-Eldin, Sybille Exner, Mohammed Al-Subhi, Nagy N N Naguib, Benjamin Kaltenbach, Andrei Roman, Thomas J Vogl
PURPOSE: To retrospectively compare the local tumour response and survival rates in patients with non-colorectal cancer lung metastases post-ablation therapy using laser-induced thermotherapy (LITT), radiofrequency ablation (RFA) and microwave ablation (MWA). MATERIAL AND METHODS: Retrospective analysis of 175 computed tomography (CT)-guided ablation sessions performed on 109 patients (43 males and 66 females, mean age: 56.6 years). Seventeen patients with 22 lesions underwent LITT treatment (tumour size: 1...
April 3, 2017: International Journal of Hyperthermia
https://www.readbyqxmd.com/read/28540787/microwave-ablation-is-effective-against-liver-metastases-from-gastric-adenocarcinoma
#13
Fubo Zhou, Xiao-Ling Yu, Ping Liang, Zhigang Cheng, Zhi-Yu Han, Jie Yu, Fangyi Liu, Yi Hu
PURPOSE: The resection rate for liver metastases from gastric cancer is only 1.4-21.1%. This study aimed to evaluate the safety and therapeutic efficacy of microwave ablation (MWA) for liver metastases from gastric adenocarcinoma (LMGC). MATERIALS AND METHODS: A database of 108 gastric adenocarcinoma patients with liver metastases who underwent MWA (n = 32) or systemic chemotherapy (n = 76) for LMGC between 2008 and 2016 was reviewed. Overall survival curves were assessed and compared based on different therapies...
March 29, 2017: International Journal of Hyperthermia
https://www.readbyqxmd.com/read/28540377/lightweight-and-efficient-microwave-absorbing-materials-based-on-walnut-shell-derived-nano-porous-carbon
#14
Xu Qiu, Lixi Wang, Hongli Zhu, Yongkang Guan, Qitu Zhang
Lightweight microwave absorbing materials have drawn tremendous attention. Herein, nano-porous biomass carbon materials have been prepared by carbonization with a subsequent potassium hydroxide activation of walnut shells and the microwave absorption properties have also been investigated. The obtained samples have large specific surface areas with numerous micropores and nanopores. The sample activated at 600 °C with a specific surface area of 736.2 m(2) g(-1) exhibits the most enhanced microwave absorption performance...
May 25, 2017: Nanoscale
https://www.readbyqxmd.com/read/28539860/comparative-evaluation-of-different-histoprocessing-methods
#15
Kartesh Singla, Simarpreet Virk Sandhu, Rana A G K Pal, Himanta Bansal, Ramanpreet Kaur Bhullar, Preetinder Kaur
OBJECTIVES: Tissue processing for years is carried out by the conventional method, which is a time-consuming technique resulting in 1-day delay in diagnosis. However, in this area of modernization and managed care, rapid diagnosis is increasingly desirable to fulfill the needs of clinicians. The objective of the present study was to compare and determine the positive impact on turnaround times of different tissue processing methods by comparing the color intensity, cytoplasmic details, and nuclear details of the tissues processed by three methods...
April 2017: International Journal of Health Sciences
https://www.readbyqxmd.com/read/28539712/betulinic-acid-from-zizyphus-joazeiro-bark-using-focused-microwave-assisted-extraction-and-response-surface-methodology
#16
Fernanda Carolina Sousa Fonseca, Letícia Caribé Batista Reis, Jener David Gonçalves Dos Santos, Carla Rodrigues Cardoso Branco, Sergio Luis da Costa Ferreira, Jorge Mauricio David, Alexsandro Branco
BACKGROUND: The effect of the extraction time (min) and temperature (°C) on the yield of betulinic acid (BA) from Zizyphus joazeiro barks using focused microwave-assisted extraction was investigated. MATERIALS AND METHODS: The ethyl acetate was used as extractor solvent because it was shown to provide a betulinic acid-clean extract. A full two-level statistical factorial design was applied to determine the important effects and interactions of these independent variables upon the yield of BA...
April 2017: Pharmacognosy Magazine
https://www.readbyqxmd.com/read/28537307/microwave-absorbing-property-optimization-of-starlike-zno-reduced-graphene-oxide-doped-by-zno-nanocrystal-composites
#17
Wei Feng, Yaming Wang, Junchen Chen, Lixin Guo, Jiahu Ouyang, Dechang Jia, Yu Zhou
This study constructs a unique structure of reduced graphene oxide (RGO)/ZnO composite combining starlike ZnO with RGO doped by ZnO nanocrystals through an in situ crystallization method. After mixing graphene oxide (GO) dispersion with Zn(NO3)2 and KOH solution, zinc ions absorbed on graphene oxide sheets transform ZnO nanocrystals, and the free zinc ions form starlike ZnO. After thermal treatment, RGO sheets doped by uniformly dispersed ZnO nanocrystals wrap the starlike ZnO or insert in the gap between them...
May 24, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28537028/enhanced-larvicidal-antibacterial-and-photocatalytic-efficacy-of-tio2-nanohybrids-green-synthesized-using-the-aqueous-leaf-extract-of-parthenium-hysterophorus
#18
Keerthika Thandapani, Manikandan Kathiravan, Elangovan Namasivayam, Indira Arulselvi Padiksan, Geetha Natesan, Manish Tiwari, Benelli Giovanni, Venkatachalam Perumal
Titanium dioxide nanoparticles are emerging as a biocompatible nanomaterial with multipurpose bioactivities. In this study, titanium dioxide (TiO2) nanoparticles were effectively synthesized using the aqueous leaf extracts of Parthenium hysterophorus prepared by microwave irradiation. TiO2 nanoparticles were fabricated by treating the P. hysterophorus leaf extracts with the TiO4 solution. Biologically active compounds such as alcohols, phenols, alkanes, and fluoroalkanes were involved in bioreduction of TiO4 into TiO2...
May 23, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28534917/charge-stabilizing-tris-triphenylamine-zinc-porphyrin-carbon-nanotube-hybrids-synthesis-characterization-and-excited-state-charge-transfer-studies
#19
Luis M Arellano, Myriam Barrejón, Habtom B Gobeze, María J Gómez-Escalonilla, José Luis G Fierro, Francis D'Souza, Fernando Langa
Functionalization of single-walled (SWCNTs) and double-walled carbon nanotubes (DWCNTs) with a charge stabilizing zinc porphyrin functionalized with triphenylamine entities has been accomplished. The synthetic approach involved the reaction of tris-(triphenylamine)porphyrinato zinc(ii) with iodobenzene functionalized nanotubes through a Sonogashira C-C cross coupling reaction under microwave irradiation conditions. Evidence of covalent functionalization and the extent of functionalization was obtained from systematic studies carried out by AFM, TGA, XPS and Raman spectroscopy techniques...
May 23, 2017: Nanoscale
https://www.readbyqxmd.com/read/28534403/laminated-and-two-dimensional-carbon-supported-microwave-absorbers-derived-from-mxenes
#20
Meikang Han, Xiaowei Yin, Xinliang Li, Babak Anasori, Litong Zhang, Laifei Cheng, Yury Gogotsi
Microwave absorbers with layered structures that can provide abundant interfaces are highly desirable for enhancing electromagnetic absorbing capability and decreasing the thickness. The atomically thin layers of two-dimensional (2D) transition metal carbides (MXenes) make them a convenient precursor for synthesis of other 2D and layered structures. Here, laminated carbon/TiO2 hybrid materials composed of well-aligned 2D carbon sheets with embedded TiO2 nanoparticles were synthesized and showed excellent microwave absorption...
May 23, 2017: ACS Applied Materials & Interfaces
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