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https://www.readbyqxmd.com/read/28214590/green-engineered-biomolecule-capped-silver-and-copper-nanohybrids-using-prosopis-cineraria-leaf-extract-enhanced-antibacterial-activity-against-microbial-pathogens-of-public-health-relevance-and-cytotoxicity-on-human-breast-cancer-cells-mcf-7
#1
U Jinu, M Gomathi, I Saiqa, N Geetha, G Benelli, P Venkatachalam
This research focused on green engineering and characterization of silver (PcAgNPs) and copper nanoparticles (PcCuNPs) using Prosopis cineraria (Pc) leaf extract prepared by using microwave irradiation. We studied their enhanced antimicrobial activity on human pathogens as well as cytotoxicity on breast cancer cells (MCF-7). Biofabricated silver and copper nanoparticles exhibited UV-Visible absorbance peaks at 420 nm and 575 nm, confirming the bioreduction and stabilization of nanoparticles. Nanoparticles were characterized by FTIR, XRD, FESEM, and EDX analysis...
February 15, 2017: Microbial Pathogenesis
https://www.readbyqxmd.com/read/28213327/visualizing-bpa-by-molecularly-imprinted-ratiometric-fluorescence-sensor-based-on-dual-emission-nanoparticles
#2
Hongzhi Lu, Shoufang Xu
Construction of ratiometric fluorescent probe often involved in tedious multistep preparation or complicated coupling or chemical modification process. The emergence of dual emission fluorescent nanoparticles would simplify the construction process and avoids the tedious chemical coupling. Herein, we reported a facile strategy to prepare ratiometric fluorescence molecularly imprinted sensor based on dual emission nanoparticles (d-NPs) which comprised of carbon dots and gold nanoclusters for detection of Bisphenol A (BPA)...
February 11, 2017: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/28213325/carbon-dots-based-fret-for-the-detection-of-dna-damage
#3
Jiri Kudr, Lukas Richtera, Kledi Xhaxhiu, David Hynek, Zbynek Heger, Ondrej Zitka, Vojtech Adam
Here, we aimed our attention at the synthesis of carbon dots (C-dots) with the ability to interact with DNA to suggest an approach for the detection of DNA damage. Primarily, C-dots modified with amine moieties were synthesized using the one-step microwave pyrolysis of citric acid in the presence of diethylenetriamine. The C-dots showed strong photoluminescence with a quantum yield of 4%. In addition, the C-dots (2.8±0.8nm) possessed a good colloidal stability and exhibited a positive surface charge (ζ=36mV) at a neutral pH...
February 9, 2017: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/28213226/a-feasible-method-for-indirect-quantification-of-l-t4-in-drugs-by-iodine-determination
#4
Marcia Foster Mesko, Alessandra Cortes Teotonio, Dirce Taina Teixeira Oliveira, Diogo La Rosa Novo, Vanize Caldeira Costa
In this work, a method combining microwave-induced combustion (MIC) for sample preparation of commercial levothyroxine sodium (L-T4) drugs (L-T4: 25-200µg/tablet), and potentiometry with ion selective electrode (ISE) for iodine determination and subsequent indirect quantification of L-T4 was proposed. The type and concentration of the absorbing solution were evaluated to select the most suitable conditions for this study. Using the MIC method, it was possible to use solutions as diluted as 150mmolL(-1) (NH4)2CO3 (for samples containing 25-200µg of L-T4/tablet) for I absorption...
May 1, 2017: Talanta
https://www.readbyqxmd.com/read/28212459/structural-studies-of-nicotinoids-cotinine-vs-nicotine
#5
Iciar Uriarte, Cristóbal Pérez, Elena Caballero-Mancebo, Francisco J Basterretxea, Alberto Lesarri, José A Fernández, Emilio J Cocinero
Nicotinoids are agonists of the acetylcholine receptor (nAChR) and play important biochemical and pharmacological roles. Here we report on the structural and conformational landscape of cotinine, and compare its molecular properties with the nicotine prototype, from which it only differs in the addition of a carbonyl group. The investigation of cotinine included a theoretical survey of the effects of rotamerization of the pyridine moiety, the puckering of the pyrrolidinone ring and the internal rotation of the methyl group...
February 17, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28212344/green-microwave-assisted-combustion-synthesis-of-zinc-oxide-nanoparticles-with-citrullus-colocynthis-l-schrad-characterization-and-biomedical-applications
#6
Susan Azizi, Rosfarizan Mohamad, Mahnaz Mahdavi Shahri
In this paper, a green microwave-assisted combustion approach to synthesize ZnO-NPs using zinc nitrate and Citrullus colocynthis (L.) Schrad (fruit, seed and pulp) extracts as bio-fuels is reported. The structure, optical, and colloidal properties of the synthesized ZnO-NP samples were studied. Results illustrate that the morphology and particle size of the ZnO samples are different and depend on the bio-fuel. The XRD results revealed that hexagonal wurtzite ZnO-NPs with mean particle size of 27-85 nm were produced by different bio-fuels...
February 16, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/28212092/modeling-contrast-imaging-assisted-optimal-targeted-drug-delivery-a-touchable-communication-channel-estimation-and-waveform-design-perspective
#7
Yifan Chen, Yu Zhou, Ross Murch, Panagiotis Kosmas
To maximize the effect of treatment and minimize the adverse effect on patients, we propose to optimize nanorobotsassisted targeted drug delivery (TDD) for locoregional treatment of tumor from the perspective of touchable communication channel estimation and waveform design. The drug particles are the information molecules; the loading/injection and unloading of the drug correspond to the transmitting and receiving processes; the concentration-time profile of the drug particles administered corresponds to the signalling pulse...
February 15, 2017: IEEE Transactions on Nanobioscience
https://www.readbyqxmd.com/read/28212044/microwave-assisted-cp-co-iii-catalyzed-c-h-activation-double-c-n-bond-formation-reactions-to-thiadiazine-1-oxides
#8
Jiapian Huang, Yangfei Huang, Tao Wang, Qin Huang, Zhihua Wang, Zhiyuan Chen
A microwave-assisted, Cp*Co(III)-catalyzed direct C-H activation/double C-N bond formation reaction of simple NH-sulfoximines with 1,4,2-dioxazol-5-ones to produce diverse thiadiazine-1-oxides is reported. The reaction tolerates a broad range of functional groups under external oxidant-free conditions and only releases CO2 and H2O as the sole byproducts. The preliminary mechanistic studies revealed an electrophilic metalation pathway is likely involved in the reaction.
February 17, 2017: Organic Letters
https://www.readbyqxmd.com/read/28209407/life-cycle-assessment-of-facile-microwave-assisted-zinc-oxide-zno-nanostructures
#9
D Papadaki, S Foteinis, G H Mhlongo, S S Nkosi, D E Motaung, S S Ray, T Tsoutsos, G Kiriakidis
The life cycle assessment of several zinc oxide (ZnO) nanostructures, fabricated by a facile microwave technique, is presented. Key synthesis parameters such as annealing temperature, varied from 90°C to 220°C, and microwave power, varied from 110W to 710W, are assessed. The effect of these parameters on both the structural characteristics and the environmental sustainability of the nanostructures is examined. The nanostructures were characterized by means of X-ray diffraction (XRD), focused ion beam scanning electron microscopy (FIB-SEM), ultraviolet-visible spectroscopy (UV-Vis), Photoluminescence (PL) and Brunauer-Emmett-Teller (BET) analysis...
February 13, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28208633/compact-planar-ultrawideband-antennas-with-3-5-5-2-5-8-ghz-triple-band-notched-characteristics-for-internet-of-things-applications
#10
Jian Dong, Qianqian Li, Lianwen Deng
Ultrawideband (UWB) antennas, as core devices in high-speed wireless communication, are widely applied to mobile handsets, wireless sensor networks, and Internet of Things (IoT). A compact printed monopole antenna for UWB applications with triple band-notched characteristics is proposed in this paper. The antenna has a very compact size of 10 x 16 mm2 and is composed of a square slotted radiation patch and a narrow rectangular ground plane on the back of the substrate. First, by etching a pair of inverted T-shaped slots at the bottom of the radiation patch, one notched band at 5-6 GHz for rejecting the Wireless Local Area Network (WLAN) is generated...
February 10, 2017: Sensors
https://www.readbyqxmd.com/read/28208091/high-temperature-dielectric-properties-of-spent-adsorbent-with-zinc-sulfate-by-cavity-perturbation-technique
#11
Guo Lin, Chenhui Liu, Libo Zhang, Tu Hu, Jinhui Peng, Jing Li, Shixing Wang
Dielectric properties of spent adsorbent with zinc sulfate are investigated by cavity perturbation technique at 2450MHz from 20°C to approximately 1000°C. Two weight loss stages are observed for spent adsorbent by thermogravimetric-differential scanning calorimeter (TG-DSC) analysis, and zinc sulfate is decomposed to ZnO·2ZnSO4 and ZnO at about 750°C and 860°C. Microwave absorption capability of ZnSO4 increases with increasing temperature and declines after ZnO generation on account of the poor dielectric properties...
February 7, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28207260/theoretical-investigations-of-the-reactions-of-n-and-o-containing-species-on-a-c-100-h-2%C3%A3-1-reconstructed-diamond-surface
#12
Mark W Kelly, Sarah C Halliwell, W Jeff Rodgers, Jason D Pattle, Jeremy N Harvey, Michael N R Ashfold
Quantum mechanical and hybrid quantum mechanical/molecular mechanical (QM/MM) cluster models have been used to investigate possible reaction mechanisms whereby gas phase NHx (x = 0-2), CNHx (x = 0, 1) and OH radicals can add to, and incorporate in, a C-C dimer bond on the C(100):H 21 diamond surface during chemical vapor deposition from microwave activated C/H containing gas mixtures containing trace amounts of added N or O. Three N incorporation routes are identified, initiated by N, NH and CN(H) addition to a surface radical site, whereas only OH addition was considered as the precursor to O incorporation...
February 16, 2017: Journal of Physical Chemistry. A
https://www.readbyqxmd.com/read/28205507/a-facile-self-template-strategy-for-synthesizing-1d-porous-ni-c-nanorods-towards-efficient-microwave-absorption
#13
Yanan Zhang, Xingmiao Zhang, Bin Quan, Guangbin Ji, Xiaohui Liang, Wei Liu, Youwei Du
Ni@C composites, which simultaneously possess porous, core-shell and 1D nanostructures have been synthesized with a facile self-template strategy. The precursors were obtained by a hydrothermal process using NiCl2 · 6H2O and nitrilotriacetic acid as the starting material and then annealed at 400 °C, 500 °C, and 600 °C. The Ni@C composites annealed at 500 °C display a nanorod feature with a length of ∼3 μm and diameter of 230-500 nm. In addition, about 3 nm carbon shells and 4 nm Ni cores can be found in Ni@C nanorods...
February 16, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28205216/the-diagnostic-value-of-quantitative-assessment-of-diatom-test-for-drowning-an-analysis-of-128-water-related-death-cases-using-microwave-digestion-vacuum-filtration-automated-scanning-electron-microscopy
#14
Jian Zhao, Chao Liu, Adham Sameer A Bardeesi, Yeda Wu, Yanbing Ma, Sunlin Hu, He Shi, Jianding Cheng
The value of diatom test for the diagnosis of drowning remains controversial. The conventional forensic diatom test with low sensitivity is not a useful tool to provide accurate information about diatom in the tissues and organs. To improve the sensitivity of the diatom test, we developed a novel method called the Microwave Digestion-Vacuum Filtration-Automated Scanning Electron Microscopy (MD-VF-Auto SEM) method which resulted in a high recovery of diatoms. In this article, we analyzed 128 water-related death cases...
February 15, 2017: Journal of Forensic Sciences
https://www.readbyqxmd.com/read/28204838/a-preliminary-investigation-on-metal-bioaccumulation-by-perenniporia-fraxinea
#15
M Sturini, C Girometta, F Maraschi, E Savino, A Profumo
The lignicolous macrofungus Perenniporia fraxinea has drawn increased attention due to its role as a pathogen of ornamentals in urban sites. The present study investigated the bioaccumulation of heavy metals by P. fraxinea. Sporophores were collected from urban and suburban areas in Pavia (Northern Italy) and analyzed for metals content (Cd, Hg, Pb, Ni, Cr, Cu, Fe, Mn, Zn) by inductively coupled plasma mass spectrometer and inductively coupled plasma optical emission spectroscopy, after microwave acidic digestion...
February 15, 2017: Bulletin of Environmental Contamination and Toxicology
https://www.readbyqxmd.com/read/28203621/comparative-study-evaluating-the-efficiency-of-cooled-and-uncooled-single-treatment-mwa-in-thyroid-nodules-after-a-3-month-follow-up
#16
Oscar Maximilian Mader, Nadine Farivar Tanha, Alexander Mader, Christian Happel, Yücel Korkusuz, Frank Grünwald
OBJECTIVE: The aim of this study was to evaluate and compare the efficacy of single-treatment cooled and uncooled microwave ablation in thyroid nodules. METHODS: Eighteen patients (11 women) with an average age of 62 years (range: 41-80) with 18 cold, mainly solid or solid thyroid nodules were treated with cooled or uncooled microwave ablation. Pain during the treatment was measured on a 10-point score. Side effects revealed by ultrasound or patients' complaints were documented...
2017: European Journal of Radiology Open
https://www.readbyqxmd.com/read/28202903/dynamic-control-of-asymmetric-electromagnetic-wave-transmission-by-active-chiral-metamaterial
#17
Ke Chen, Yijun Feng, Li Cui, Junming Zhao, Tian Jiang, Bo Zhu
The asymmetric transmission of electromagnetic (EM) wave can be fully manipulated by chiral metamaterials, but little can achieve real-time and high efficient tunability due to challenges in practically deployable solutions. Here, we proposed a new scheme for flexibly and dynamically controlling the asymmetric EM wave transmission at microwave frequencies using planar metamaterial of deep subwavelength thickness incorporated with active components of PIN diodes. The asymmetric transmission of linearly polarized EM wave exhibits a high efficiency and a pronounced real-time continuous tunability controlled by the external stimulation of voltage biasing...
February 16, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28199947/environmental-biomonitoring-of-essential-and-toxic-elements-in-human-scalp-hair-using-accelerated-microwave-assisted-sample-digestion-and-inductively-coupled-plasma-optical-emission-spectroscopy
#18
Hope Kumakli, A'ja V Duncan, Kiara McDaniel, Tsdale F Mehari, Jamira Stephenson, Lareisha Maple, Zaria Crawford, Calvin L Macemore, Carol M Babyak, Sayo O Fakayode
Human scalp hair samples were collected and used to assess exposure to toxic elements and essential elements in the state of North Carolina, USA using accelerated microwave assisted acid digestion and inductively coupled plasma optical emission spectroscopy (ICP-OES). The figures-of-merit of the ICP-OES were appropriate for elemental analysis in scalp hair with detection limits as low as 0.0001 mg/L for Cd, good linearity (R(2) > 0.9978), and percent recoveries that ranged from 96 to 106% for laboratory-fortified-blanks and 88-112% for sample spike recovery study...
February 6, 2017: Chemosphere
https://www.readbyqxmd.com/read/28199121/smart-contact-lenses-with-graphene-coating-for-electromagnetic-interference-shielding-and-dehydration-protection
#19
Sangkyu Lee, Insu Jo, Sangmin Kang, Bongchul Jang, Joonhee Moon, Jong Bo Park, Soochang Lee, Sichul Rho, Youngsoo Kim, Byung Hee Hong
Recently, smart contact lenses with electronic circuits have been proposed for various sensor and display applications, where the use of flexible and biologically stable electrode materials is essential. Graphene is an atomically thin carbon materials with 2-dimensional hexagonal lattice, showing outstanding electrical and mechanical properties as well as excellent biocompatibility. In addition, graphene is capable of protecting eyes from electromagnectic (EM) waves that may cause eye diseases such as cataracts...
February 15, 2017: ACS Nano
https://www.readbyqxmd.com/read/28198866/trapped-spoof-surface-plasmons-with-structured-defects-in-textured-closed-surfaces
#20
Hong-Wei Wu, Hua-Jun Chen, Hui-Ying Fan, Yang Li, Xian-Wen Fang
We demonstrate that a defect unit in periodic textured closed surfaces is able to trap spoof surface plasmons (SPs) into a deep subwavelength scale. The resonant frequency of a trapped spoof SP can be tuned freely by properly tailoring the dimension of the defect unit. By introducing multiple defect units with different dimensions at different positions of the textured closed surfaces, the spoof SPs with different frequencies trapped effectively at desired places are also demonstrated. In addition, we further design a graded defect structure with continuously variable dimensions to trap the spoof SPs over an ultrawide spectral band...
February 15, 2017: Optics Letters
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