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https://www.readbyqxmd.com/read/29167938/multi-isotope-calibration-for-inductively-coupled-plasma-mass-spectrometry
#1
Alex Virgilio, Joaquim A Nóbrega, George L Donati
Multi-isotope calibration (MICal) is a novel approach to calibration for inductively coupled plasma mass spectrometry (ICP-MS). In MICal, only two calibration solutions are required: solution A, composed of 50% v v(-1) of sample and 50% v v(-1) of a standard solution containing the analytes, and solution B, composed of 50% v v(-1) of sample and 50% v v(-1) of a blank solution. MICal is based on monitoring the signal intensities of several isotopes of the same analyte in solutions A and B. By plotting the analytical signals from solution A in the x-axis, and from solution B in the y-axis, the analyte concentration in the sample is calculated using the slope of that graph and the concentration of the reference standard added to solution A...
November 22, 2017: Analytical and Bioanalytical Chemistry
https://www.readbyqxmd.com/read/29161574/fast-spectroscopic-monitoring-of-inhibitors-in-the-2g-ethanol-process
#2
Ariane S S Pinto, Marcelo P A Ribeiro, Cristiane S Farinas
One of the main challenges of second generation (2G) ethanol production is the high quantities of phenolic compounds and furan derivatives generated in the pretreatment of the lignocellulosic biomass, which inhibit the enzymatic hydrolysis and fermentation steps. Fast monitoring of these inhibitory compounds could provide better control of the pretreatment, hydrolysis, and fermentation processes by enabling the implementation of strategic process control actions. We investigated the feasibility of monitoring these inhibitory compounds by ultraviolet-visible (UV-Vis) spectroscopy associated with partial least squares (PLS) regression...
November 14, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/29147443/4-nitroquinoline-1-oxide-induced-tongue-and-esophagus-carcinogenesis-in-obese-and-diabetic-tsod-mice
#3
Takuji Tanaka, Kunihiro Kawabata, Shigeyuki Sugie
Background: Obesity and diabetes mellitus are associated with lifestyle-related carcinogenesis. They are also risk factors of esophageal adenocarcinoma, but there are only a few reports on association between obesity/diabetes and development of squamous cell carcinoma in the oral cavity and esophagus. In this study, we therefore aimed to determine whether obesity and diabetes affect oral and esophageal carcinogenesis using model mice of obesity and diabetes, the Tsumura Suzuki obese diabetes (TSOD) and Tsumura Suzuki non-obesity (TSNO) control mice, which were treated with 4-nitroquinoline 1-oxide (4-NQO) to produce tongue and esophageal carcinomas...
August 2017: World Journal of Oncology
https://www.readbyqxmd.com/read/29145018/nitrogen-phosphorus-dual-doped-molybdenum-carbide-molybdenum-phosphide-carbon-nanospheres-for-efficient-hydrogen-evolution-over-the-whole-ph-range
#4
Jing-Qi Chi, Wen-Kun Gao, Jia-Hui Lin, Bin Dong, Kai-Li Yan, Jun-Feng Qin, Zi-Zhang Liu, Yong-Ming Chai, Chen-Guang Liu
MoO4(2-)@aniline-pyrrole (MoO4(2-)@polymer) spheres as precursors have been used to synthesize unique core-shell nanostructure consisting of molybdenum carbide and molybdenum phosphide composites encapsulated into uniformly dual N, P-doped carbon shells (Mo2C/MoP@NPC) through a facile two-step strategy. Firstly, porous core-shell N-doped Mo2C@C (Mo2C@NC) nanospheres have been synthesized with ultrafine Mo2C nanoparticles as core and ultrathin NC as shell by a annealing route. Secondly, Mo2C/MoP@NPC has been obtained maintaining intact spherical-like morphology through a phosphidation reaction in high temperature...
November 10, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/29143930/photovoltaic-cell-electrical-heating-system-for-removing-snow-on-panel-including-verification
#5
Agnes Weiss, Helmut Weiss
Small photovoltaic plants in private ownership are typically rated at 5 kW (peak). The panels are mounted on roofs at a decline angle of 20° to 45°. In winter time, a dense layer of snow at a width of e.g., 10 cm keeps off solar radiation from the photovoltaic cells for weeks under continental climate conditions. Practically, no energy is produced over the time of snow coverage. Only until outside air temperature has risen high enough for a rather long-time interval to allow partial melting of snow; the snow layer rushes down in an avalanche...
November 16, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/29122414/the-effect-of-hydration-on-voice-quality-in-adults-a-systematic-review
#6
REVIEW
Maxine Alves, Esedra Krüger, Bhavani Pillay, Kristiane van Lierde, Jeannie van der Linde
OBJECTIVES: We aimed to critically appraise scientific, peer-reviewed articles, published in the past 10 years on the effects of hydration on voice quality in adults. STUDY DESIGN: This is a systematic review. METHODS: Five databases were searched using the key words "vocal fold hydration", "voice quality", "vocal fold dehydration", and "hygienic voice therapy". The Preferred Reporting Items for Systematic Review and Meta-Analyses (PRISMA) guidelines were followed...
November 6, 2017: Journal of Voice: Official Journal of the Voice Foundation
https://www.readbyqxmd.com/read/29120756/centrifugeless-dispersive-liquid-liquid-microextraction-based-on-salting-out-phenomenon-followed-by-high-performance-liquid-chromatography-for-determination-of-sudan-dyes-in-different-species
#7
Mohammad Bazregar, Maryam Rajabi, Yadollah Yamini, Somayeh Arghavani-Beydokhti, Alireza Asghari
In this work, a novel method, namely centrifugeless dispersive liquid-liquid microextraction, is introduced for the efficient extraction of banned Sudan dyes from foodstuff and water samples. In this method, which is based upon the salting-out phenomenon, in order to accelerate the extraction process, the extraction solvent (1-undecanol, 75 μL) is dispersed into the sample solution. Then the mixture is passed through a small column filled with 5 g sodium chloride, used as a separating reagent. In this condition, fine droplets of the extraction solvent are floated on the mixture, and the phase separation is simply achieved...
April 1, 2018: Food Chemistry
https://www.readbyqxmd.com/read/29093483/rotational-dynamics-and-dynamical-transition-of-water-inside-hydrophobic-pores-of-carbon-nanotubes
#8
Haruka Kyakuno, Kazuyuki Matsuda, Yusuke Nakai, Ryota Ichimura, Takeshi Saito, Yasumitsu Miyata, Kenji Hata, Yutaka Maniwa
Water in a nanoconfined geometry has attracted great interest from the viewpoint of not only basic science but also nanofluidic applications. Here, the rotational dynamics of water inside single-walled carbon nanotubes (SWCNTs) with mean diameters larger than ca. 1.4 nm were investigated systematically using (2)H nuclear magnetic resonance spectroscopy with high-purity SWCNTs and molecular dynamics calculations. The results were compared with those for hydrophilic pores. It was found that faster water dynamics could be achieved by increasing the hydrophobicity of the pore walls and decreasing the pore diameters...
November 1, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29080813/arginine-reverses-growth-hormone-resistance-through-the-inhibition-of-toll-like-receptor-4-mediated-inflammatory-pathway
#9
Jingren Xu, Canjun Zhu, Mengyuan Zhang, Qingchun Tong, Xiaojuan Wan, Zhengrui Liao, Xingcai Cai, Yaqiong Xu, Yexian Yuan, Lina Wang, Xiaotong Zhu, Songbo Wang, Ping Gao, Qianyun Xi, Yong Xu, Qingyan Jiang, Gang Shu
OBJECTIVE: Growth hormone stimulates growth by increasing insulin-like growth factor 1 expression and secretion. In the presence of insufficient nutrients, GH increases, whereas IGF-1 expression becomes severely suppressed, leading to GH resistance. This study aimed to explore the effect of arginine (Arg) on GH resistance during malnutrition and to describe its underlying mechanism. METHODS: C57BL/6J mice were injected intraperitoneally with Arg for 1 h or subjected to caloric restriction with Arg supplement in drinking water for 18 days...
October 25, 2017: Metabolism: Clinical and Experimental
https://www.readbyqxmd.com/read/29072195/evaluation-of-water-mimicking-solid-phantom-materials-for-use-in-hdr-and-ldr-brachytherapy-dosimetry
#10
Andreas Alexander Schoenfeld, Maike Thieben, Dietrich Harder, Bjoern Poppe, Ndimofor Chofor
In modern HDR or LDR brachytherapy with photon emitters, fast checks of the dose profiles generated in water or a water-equivalent phantom have to be available in the interest of patient safety. However, the commercially available brachytherapy photon sources cover a wide range of photon emission spectra, and the range of the in-phantom photon spectrum is further widened by Compton scattering, so that the achievement of water-mimicking properties of such phantoms involves high requirements on their atomic composition...
October 26, 2017: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/29068657/non-continuum-intercalated-water-diffusion-explains-fast-permeation-through-graphene-oxide-membranes
#11
Shuping Jiao, Zhiping Xu
Recent experimental studies have revealed unconventional phase and transport behaviors of water confined within lamellar graphene oxide membranes, which hold great promise not only in improving our current understanding of nanoconfined water but also in developing high-performance filtration and separation applications. In this work, we explore molecular structures and diffusive dynamics of water intercalated between graphene or graphene oxide sheets. We identify the monolayer structured water between graphene sheets at temperature T below Tc = ∼315 K and an interlayer distance d = 0...
November 2, 2017: ACS Nano
https://www.readbyqxmd.com/read/29063927/dealloying-directed-synthesis-of-efficient-mesoporous-cofe-based-catalysts-towards-the-oxygen-evolution-reaction-and-overall-water-splitting
#12
Lulu Han, Chaoqun Dong, Chi Zhang, Yulai Gao, Jie Zhang, Hui Gao, Ying Wang, Zhonghua Zhang
It is a great challenge to design highly active, stable and low-cost catalysts for electrochemically splitting water to realize the clean energy generation and renewable energy storage. Herein, a facile one-step dealloying strategy was proposed to synthesize mesoporous CoFe-based oxides and layered double hydroxides (LDHs). Benefitting from the fast mass transfer and more active sites caused by the open mesoporous structure, the CoFe-based materials exhibit excellent electrocatalytic activities and stability towards the oxygen evolution reaction (OER) in an alkaline electrolyte (1 M KOH)...
November 2, 2017: Nanoscale
https://www.readbyqxmd.com/read/29054146/highly-sensitive-and-rapid-colorimetric-sensing-platform-based-on-water-soluble-wox-quantum-dots-with-intrinsic-peroxidase-like-activity
#13
Huaping Peng, Danwei Lin, Pan Liu, Yanhong Wu, Shanhong Li, Yun Lei, Wei Chen, Yuanzhong Chen, Xinhua Lin, Xinghua Xia, Ailin Liu
This report outlines a rapid and highly sensitive colorimetric sensing platform based on a novel water-soluble WOx quantum dots (QDs) as enzymatic mimics. The WOx QDs, synthesized by a green hydrothermal method, were proven to possess excellent intrinsic peroxidase-like activity. The peroxidase substrate, 2, 2'-azinobis (3-ethylbenzthiazoline-6-sulfonic acid) diammonium salt (ABTS) could be catalyzed oxidation by WOx QDs quickly in the present of H2O2 to form a green color. Due to its excellent properties such as excellent water-solublity, good biocompatibility, easy preparation, and high stability, the proposed system showed typical Michaelis-Menten kinetics and high affinity for ABTS and H2O2, indicating WOx QDs can be used as satisfactory peroxidase mimics...
November 1, 2017: Analytica Chimica Acta
https://www.readbyqxmd.com/read/29046302/a-1-h-time-interval-between-a-meal-containing-iron-and-consumption-of-tea-attenuates-the-inhibitory-effects-on-iron-absorption-a-controlled-trial-in-a-cohort-of-healthy-uk-women-using-a-stable-iron-isotope
#14
Salma F Ahmad Fuzi, Dagmar Koller, Sylvaine Bruggraber, Dora Ia Pereira, Jack R Dainty, Sohail Mushtaq
Background: Tea has been shown to be a potent inhibitor of nonheme iron absorption, but it remains unclear whether the timing of tea consumption relative to a meal influences iron bioavailability.Objective: The aim of the study was to investigate the effect of a 1-h time interval of tea consumption on nonheme iron absorption in an iron-containing meal in a cohort of iron-replete, nonanemic female subjects with the use of a stable isotope ((57)Fe).Design: Twelve women (mean ± SD age: 24.8 ± 6.9 y) were administered a standardized porridge meal extrinsically labeled with 4 mg (57)Fe as FeSO4 on 3 separate occasions, with a 14-d time interval between each test meal (TM)...
October 18, 2017: American Journal of Clinical Nutrition
https://www.readbyqxmd.com/read/29045600/development-and-validation-of-a-stability-indicating-reversed-phase-uplc-uv-method-for-the-assay-of-imidacloprid-and-estimation-of-its-related-compounds
#15
Jingzhi Tian, Abu Rustum
Imidacloprid is used as an active pharmaceutical ingredient (API) in veterinary drugs to control fleas and ticks for dogs and cats. Here we are reporting for the first time a validated stability-indicating reversed-phase UPLC-UV method for the assay of imidacloprid and estimation of its related compounds. The stability-indicating capability of this method has been demonstrated by a forced degradation study. All related compounds including processing impurities, imidacloprid API and degradates from stressed samples were well separated from each other...
October 17, 2017: Journal of Chromatographic Science
https://www.readbyqxmd.com/read/29040955/protective-role-of-epigallocatechin-3-gallate-on-arsenic-induced-testicular-toxicity-in-swiss-albino-mice
#16
Pushpa Rani Guvvala, Janivara Parameswaraiah Ravindra, Chukkath Vijayan Rajani, Muniandy Sivaram, Sellappan Selvaraju
Arsenic, often referred to as the king of poisons is carcinogenic in humans and animals. It affects multiorgan systems including reproduction. The present study was undertaken to explore the protective role of green tea compound, epigallocatechin-3-gallate (EGCG) on arsenic induced testicular toxicity in Swiss albino mice. Thirty two adult male mice were randomly assigned to four groups (n=8). Group I served as control without test chemical. The group II received arsenic (200ppm) through drinking water, group III received only EGCG (20mg/kgb...
October 13, 2017: Biomedicine & Pharmacotherapy, Biomédecine & Pharmacothérapie
https://www.readbyqxmd.com/read/29034519/flexible-aqueous-li-ion-battery-with-high-energy-and-power-densities
#17
Chongyin Yang, Xiao Ji, Xiulin Fan, Tao Gao, Liumin Suo, Fei Wang, Wei Sun, Ji Chen, Long Chen, Fudong Han, Ling Miao, Kang Xu, Konstantinos Gerasopoulos, Chunsheng Wang
A flexible and wearable aqueous symmetrical lithium-ion battery is developed using a single LiVPO4 F material as both cathode and anode in a "water-in-salt" gel polymer electrolyte. The symmetric lithium-ion chemistry exhibits high energy and power density and long cycle life, due to the formation of a robust solid electrolyte interphase consisting of Li2 CO3 -LiF, which enables fast Li-ion transport. Energy densities of 141 Wh kg(-1) , power densities of 20 600 W kg(-1) , and output voltage of 2.4 V can be delivered during >4000 cycles, which is far superior to reported aqueous energy storage devices at the same power level...
October 16, 2017: Advanced Materials
https://www.readbyqxmd.com/read/29031953/stable-and-fast-dissolving-amorphous-drug-composites-preparation-via-impregnation-of-neusilin-%C3%A2-ufl2
#18
Mohammad Azad, Jacqueline Moreno, Rajesh Davé
A promising approach to increase the aqueous solubility, hence the bioavailability, of poorly water-soluble drugs is to convert them into their amorphous state through impregnation into mesoporous silica. Unfortunately, mesoporous silica is not yet available in bulk quantities due to high manufacturing costs. In this work, feasibility of using a commercially available cost-effective mesoporous fine grade Neusilin(®) UFL2 to prepare amorphous drug composites of two model poorly soluble drugs, Fenofibrate and Itraconazole, is established...
October 12, 2017: Journal of Pharmaceutical Sciences
https://www.readbyqxmd.com/read/29026513/quantification-of-monoterpene-emission-sources-of-a-conifer-species-in-response-to-experimental-drought
#19
Marvin Lüpke, Michael Leuchner, Rainer Steinbrecher, Annette Menzel
Monoterpene (MT) emissions of conifer tree species, emitted from de novo synthesis and storage pools, play an important role in plant ecology and physiology. During drought stress both emission sources are affected differently and with conventional measuring techniques they are difficult to separate. We investigated (13)C labelled MT emission of eight 3-year-old Scots pine seedlings in a drought stress experiment using a dynamic gas exchange chamber system (Tree DEMON). Monoterpene, water vapour and CO2 gas exchange were measured for a 2-day normal watering, a 11-day treatment and a 3-day re-watering period...
September 2017: AoB Plants
https://www.readbyqxmd.com/read/28983506/newly-recognized-turbidity-current-structure-can-explain-prolonged-flushing-of-submarine-canyons
#20
Maria Azpiroz-Zabala, Matthieu J B Cartigny, Peter J Talling, Daniel R Parsons, Esther J Sumner, Michael A Clare, Stephen M Simmons, Cortis Cooper, Ed L Pope
Seabed-hugging flows called turbidity currents are the volumetrically most important process transporting sediment across our planet and form its largest sediment accumulations. We seek to understand the internal structure and behavior of turbidity currents by reanalyzing the most detailed direct measurements yet of velocities and densities within oceanic turbidity currents, obtained from weeklong flows in the Congo Canyon. We provide a new model for turbidity current structure that can explain why these are far more prolonged than all previously monitored oceanic turbidity currents, which lasted for only hours or minutes at other locations...
October 2017: Science Advances
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