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https://www.readbyqxmd.com/read/28738635/microwave-induced-combustion-thermal-and-morphological-aspects-for-understanding-the-mechanism-of-ignition-process-for-analytical-applications
#1
Matheus F Pedrotti, Leticia S F Pereira, Cezar A Bizzi, Jose N G Paniz, Juliano S Barin, Erico M M Flores
In the present work, for the first time a systematic study was performed using an infrared camera and scanning electron microscopy (SEM) coupled to energy dispersive X-ray spectrometry (EDS) to evaluate the mechanisms involved in microwave-induced combustion method, which has been extensively used for sample preparation. Cellulose and glass fiber discs, wetted with the igniter solution (6molL(-1) NH4NO3), were evaluated under microwave field in a monomode system. The temperature of the discs surface was recorded during microwave irradiation and the effect of NH4NO3 concentration and irradiation time on cellulose oxidation was evaluated...
November 1, 2017: Talanta
https://www.readbyqxmd.com/read/28738605/rapid-one-pot-synthesis-of-mmta-protected-fluorescent-gold-nanoclusters-for-selective-and-sensitive-detection-of-ferric-ion
#2
Jingjing Jiang, Pengfei Gao, Yan Zhang, Guomei Zhang, Ying Zhou, Chuan Dong, Shaomin Shuang
Herein, we demonstrate a straightforward synthesis of fluorescent gold nanoclusters (AuNCs), employing 2-Mercapto-4-methyl-5-thiazoleacetic acid (MMTA) as a reducing and protecting agent by a rapid one-pot synthesis method with a short time of 20min. The as-synthesized MMTA-AuNCs exhibited bright blue emission with a strong peak centered at 430nm and the quantum yield (QY) was evaluated to be 4.0%. Based on the fluorescence quenching mechanism of a surface chelating reaction between MMTA and ferric ion (Fe(3+)), the MMTA-AuNCs were exploited as a fluorescence sensor for sensitive and selective detection of Fe(3+)...
November 1, 2017: Talanta
https://www.readbyqxmd.com/read/28738547/effect-of-reflux-ratio-on-nitrogen-removal-in-a-novel-upflow-microaerobic-sludge-reactor-treating-piggery-wastewater-with-high-ammonium-and-low-cod-tn-ratio-efficiency-and-quantitative-molecular-mechanism
#3
Jia Meng, Jiuling Li, Jianzheng Li, Kaiwen Deng, Jun Nan, Pianpian Xu
A novel upflow microaerobic sludge reactor (UMSR) was constructed to treat manure-free piggery wastewater with high NH4(+)-N and low COD/TN ratio. In the light of the potential effect of effluent reflux ratio (RR) on nitrogen removal, performance of the UMSR was evaluated at 35°C and hydraulic retention time 8h with RR decreased from 45 to 25 by stages. A COD, NH4(+)-N and TN removal of above 77.1%, 80.0% and 86.6%, respectively, was kept with a RR over 35. To get an effluent of TN not more than 80mg/L with a TN load removal above 0...
July 11, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28738472/-effect-of-interleukin-6-and-interleukin-12-on-immune-response-to-hepatitis-b-vaccination-in-infants-of-hbsag-positive-mothers
#4
X F Wang, X H Shi, X X Xu, Z Q Yang, H Y Hao, F Zhang, B Wang, H X Wen, Z D Fu, T Wang, S Y Feng, B Wang, S P Wang
Objective: To explore the effect of interleukin-6 (IL-6) and Interleukin-12 (IL-12) on immune response to hepatitis B vaccination in infants of HBsAg-positive mothers. Methods: A total of 91 neonates whose mothers were HBsAg-positive were included and followed up for 12 months. HBV DNA and HBV serological markers in the peripheral blood of the neonates and infants were detected with fluorescence quantitative polymerase chain reaction (FQ-PCR) and chemiluminescence immunoassay (CLIA), and the levels of IL-6 and IL-12 in the peripheral blood of the neonates and infants were detected with enzyme-linked immunosorbent assay (ELISA)...
July 10, 2017: Zhonghua Liu Xing Bing Xue za Zhi, Zhonghua Liuxingbingxue Zazhi
https://www.readbyqxmd.com/read/28738423/continued-statin-prescriptions-after-adverse-reactions-and-patient-outcomes-a-cohort-study
#5
Huabing Zhang, Jorge Plutzky, Maria Shubina, Alexander Turchin
Background: Many patients discontinue statin treatment, often after having a possible adverse reaction. The risks and benefits of continued statin therapy after an adverse reaction are not known. Objective: To examine the relationship between continuation of statin therapy (any prescription within 12 months after an adverse reaction) and clinical outcomes. Design: Retrospective cohort study. Setting: Primary care practices affiliated with 2 academic medical centers...
July 25, 2017: Annals of Internal Medicine
https://www.readbyqxmd.com/read/28738356/thermal-preconditioning-may-prevent-tendon-adhesion-by-up-regulating-hsp72-in-rats
#6
Yang Tan, Qin-Fen Wu, Qiang Wu, Xin-Ti Tan, Liao-Bin Chen, Xin Wang
BACKGROUND/AIMS: The study aims to determine the effects of thermal preconditioning on tendon adhesion by regulating the expression of heat shock protein 72 (HSP72) in rat models. METHODS: Sixty male Wistar rats were collected and randomly assigned into the thermal preconditioning and control groups. During the 4th and 8th weeks following surgery, 15 rats were sacrificed in each period respectively, and their tendon adhesion was observed and evaluated. Biomechanical testing was performed to measure the tensile strength and gliding distance of tendons...
July 24, 2017: Cellular Physiology and Biochemistry
https://www.readbyqxmd.com/read/28738278/well-dispersed-rhenium-nanoparticles-on-three-dimensional-carbon-nanostructures-efficient-catalysts-for-the-reduction-of-aromatic-nitro-compounds
#7
Pitchaimani Veerakumar, Pounraj Thanasekaran, King-Chuen Lin, Shang-Bin Liu
Rhenium nanoparticles (ReNPs) supported on ordered mesoporous carbon (OMC) as a catalyst (Re/OMC) through a solvent-evaporation induced self-assembly (ELSA) method were prepared. The synthesized heterogonous catalyst was fully characterized using X-ray diffraction, field emission transmission electron microscopy, N2 sorption, metal dispersion, thermogravimetric analysis, Raman, Fourier-transform infrared, and X-ray photon spectroscopies. In addition, the catalyst was applied to reduce the aromatic nitro compounds (ANCs) for the first time in aqueous media and the reactions were monitored by following the intensity changes in the UV-vis absorption spectra with respect to time...
July 18, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28738243/both-facilitatory-and-inhibitory-impairments-underlie-age-related-differences-of-proactive-cognitive-control-across-the-adult-lifespan
#8
Pascal W M Van Gerven, Petra P M Hurks, Jos J Adam
We investigated two components of proactive cognitive control, response facilitation and response inhibition, in an adult lifespan sample (N=544, age range=18-91years) by administering two response-preparation tasks: a procue task, primarily involving facilitation, and an anticue task, involving both facilitation and inhibition. Cues in both tasks corresponded with the index and middle fingers of either the left or right hand. After a random preparation interval (PI) of 100-850ms following the onset of the cue signal, a single-target stimulus indicated the required response...
July 21, 2017: Acta Psychologica
https://www.readbyqxmd.com/read/28738226/shock-attenuation-characteristics-of-three-different-military-boots-during-gait
#9
A M S Muniz, R R Bini
Musculoskeletal injuries are related to the cushioning properties of boots in military populations. This study aimed to compare ground reaction force (GRF) and subjective perceived comfort from two different military boots supplied by the Brazilian Army with a commercial boot. Twenty army recruits volunteered for a GRF assessment during walking on a 10-m walkway and a perceived comfort test after 20min walking on a treadmill. Both experiments were conducted with three different military boots: CC10 (styrene-butadiene rubber - SBR - midsole 30mm thickness, 65 Shore A; 631...
July 15, 2017: Gait & Posture
https://www.readbyqxmd.com/read/28738169/behavior-of-sulfur-mustard-in-sand-concrete-and-asphalt-matrices-evaporation-degradation-and-decontamination
#10
Hyunsook Jung, Seungki Choi
The evaporation, degradation, and decontamination of sulfur mustard on environmental matrices including sand, concrete, and asphalt are described. A specially designed wind tunnel and thermal desorber in combination with gas chromatograph (GC) produced profiles of vapor concentration obtained from samples of the chemical agent deposited as a drop on the surfaces of the matrices. The matrices were exposed to the chemical agent at room temperature, and the degradation reactions were monitored and characterized...
July 24, 2017: Journal of Environmental Science and Health. Part A, Toxic/hazardous Substances & Environmental Engineering
https://www.readbyqxmd.com/read/28737927/a-facile-non-reactive-hydrogen-peroxide-h2o2-detection-method-enabled-by-ion-chromatography-with-uv-detector
#11
Mingrui Song, Junli Wang, Baiyang Chen, Lei Wang
Hydrogen peroxide (H2O2) is present ubiquitously in natural environment and nowadays widely used in water and wastewater treatment processes for pollutant control. However, current analytical methods for H2O2 inevitably require reactions between H2O2 and other reactants to yield signals, thus likely subjective to interferences of coexisting colored, oxidative, and reductive compounds. In order to overcome these barriers, we herein for the first time propose to analyze H2O2 by ion chromatography (IC) equipped with ultraviolet (UV) detector...
July 24, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28737906/role-of-the-protein-dimeric-interface-in-allosteric-inhibition-of-n-acetyl-aspartate-hydrolysis-by-human-aspartoacylase
#12
Ekaterina D Kots, Sofya V Lushchekina, Sergey D Varfolomeev, Alexander V Nemukhin
The results of molecular modeling suggest a mechanism of allosteric inhibition upon hydrolysis of N-acetyl-aspartate (NAA), one of the most abundant amino acid derivatives in brain, by human aspartoacylase (hAsp). Details of this reaction are important to suggest the practical ways to control the enzyme activity. Search for allosteric sites using the Allosite web server and SiteMap analysis allowed us to identify substrate binding pockets located at the interface between the subunits of the hAsp dimer molecule...
July 24, 2017: Journal of Chemical Information and Modeling
https://www.readbyqxmd.com/read/28737897/biogenic-hydroxyapatite-a-new-material-for-the-preservation-and-restoration-of-the-built-environment
#13
Ronald Joseph Turner, Joanna C Renshaw, Andrea Hamilton
Ordinary Portland Cement (OPC) is by weight the world's most produced man-made material, and consequently is used in a variety of applications in environments ranging from buildings, to nuclear wasteforms, and within the human body. In this paper, we present for the first time the direct deposition of biogenic hydroxyapatite onto the surface of OPC, in a synergistic process which relies upon the unique properties of the cement substrate. The synthesised hydroxyapatite is very similar to that found in nature; having a crystallite size, iron and carbonate substitution, and a semi-crystalline structure which identify that this biogenic hydroxyapatite is akin to that found in natural bone and tooth enamel...
July 24, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28737821/structure-and-reactivity-of-ru-ii-terpy-n-n-cl-cl-complexes-consequences-for-biological-applications
#14
Marta Chrzanowska, Anna Katafias, Olga Impert, Anna Kozakiewicz, Andrzej Surdykowski, Paulina Brzozowska, Alicja Franke, Achim Zahl, Ralph Puchta, Rudi van Eldik
The crystal structures of [Ru(II)(terpy)(bipy)Cl]Cl·2H2O and [Ru(II)(terpy)(en)Cl]Cl·3H2O, where terpy = 2,2':6',2''-terpyridine, bipy = 2,2'-bipyridine and en = ethylenediamine, were determined and compared to the structure of the complexes in solution obtained by multi-nuclear NMR spectroscopy in DMSOd-6 as a solvent. In aqueous solution, both chlorido complexes aquate fully to the corresponding aqua complexes, viz. [Ru(II)(terpy)(bipy)(H2O)](2+) and [Ru(II)(terpy)(en)(H2O)](2+), within ca. 2 h and ca. 2 min at 37 °C, respectively...
July 24, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/28737819/insertion-reactions-of-small-unsaturated-molecules-in-the-n-b-bonds-of-boron-guanidinates
#15
Alberto Ramos, Antonio Antiñolo, Fernando Carrillo-Hermosilla, Rafael Fernández-Galán, María Del Pilar Montero-Rama, Elena Villaseñor, Antonio Rodríguez-Diéguez, Daniel García-Vivó
We report here 1,1- and 1,2-insertion reactions of small unsaturated molecules in the N-B bonds of two boron guanidinates, (Me2N)C(N(i)Pr)2BCy2 (1) and {(i)Pr(H)N}C(N(i)Pr){N(p-(t)Bu-C6H4)}BCy2 (2), and two bisboron guanidinates(2-), {(i)Pr(BCy2)N}C(N(i)Pr){N(p-(t)Bu-C6H4)}BCy2 (3) and {(i)Pr(C8H14B)N}C(N(i)Pr){N(p-Me-C6H4)}BC8H14 (4), the latter being prepared for the first time by double deprotonation of the corresponding guanidine with the 9-borabicyclo[3.3.1]nonane dimer, (H-BC8H14)2. Compounds 1-4 easily insert aromatic isonitriles, XylNC (Xyl = 2,6-Me2-C6H3) and (p-MeO-C6H4)NC, to give the expected diazaboroles 5-12, some of them being structurally characterised by X-ray diffraction...
July 24, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/28737747/a-spatially-localized-architecture-for-fast-and-modular-dna-computing
#16
Gourab Chatterjee, Neil Dalchau, Richard A Muscat, Andrew Phillips, Georg Seelig
Cells use spatial constraints to control and accelerate the flow of information in enzyme cascades and signalling networks. Synthetic silicon-based circuitry similarly relies on spatial constraints to process information. Here, we show that spatial organization can be a similarly powerful design principle for overcoming limitations of speed and modularity in engineered molecular circuits. We create logic gates and signal transmission lines by spatially arranging reactive DNA hairpins on a DNA origami. Signal propagation is demonstrated across transmission lines of different lengths and orientations and logic gates are modularly combined into circuits that establish the universality of our approach...
July 24, 2017: Nature Nanotechnology
https://www.readbyqxmd.com/read/28737683/increased-risk-of-drug-induced-hyponatremia-during-high-temperatures
#17
Anna K Jönsson, Henrik Lövborg, Wolfgang Lohr, Bertil Ekman, Joacim Rocklöv
PURPOSE: To investigate the relationship between outdoor temperature in Sweden and the reporting of drug-induced hyponatremia to the Medical Products Agency (MPA). METHODS: All individual adverse drug reactions (ADR) reported to MPA from 1 January 2010 to 31 October 2013 of suspected drug-induced hyponatremia and random controls were identified. Reports where the ADR had been assessed as having at least a possible relation to the suspected drug were included. Information on administered drugs, onset date, causality assessment, sodium levels, and the geographical origin of the reports was extracted...
July 22, 2017: International Journal of Environmental Research and Public Health
https://www.readbyqxmd.com/read/28737446/quantitative-in-vitro-phenotyping-and-prediction-of-drug-interaction-potential-of-cyp2b6-substrates-as-victims
#18
Raghava Choudary Palacharla, Ramakrishna Nirogi, Venkatesham Uthukam, Arunkumar Manoharan, Ranjith Kumar Ponnamaneni, Ilayaraja Kalaikadhiban
1. Determination of fm, CYP for a compound is critical to assess the potential risk of a drug candidate as a victim of DDI. Several compounds are identified as CYP2B6 substrates but the fm, CYP2B6 values are not determined quantitatively 2. Two methods of reaction phenotyping, the chemical inhibition method, and metabolism in rCYP enzymes, were used to determine the relative contributions of the enzymes. Chemical inhibition method was also conducted in the presence of BSA (0.5% w/v) 3. The results confirm with the earlier studies concerning the identity of the CYP2B6 enzyme...
July 24, 2017: Xenobiotica; the Fate of Foreign Compounds in Biological Systems
https://www.readbyqxmd.com/read/28737405/enhanced-gas-sensitivity-and-sensing-mechanism-of-network-structures-assembled-from-%C3%AE-fe2o3-nanosheets-with-exposed-104-facets
#19
Yong Ma, Juan Yang, Yukun Yuan, Hua Zhao, Qian Shi, Fangjuan Zhang, Cuijin Pei, Bin Liu, Heqing Yang
Network structures assembled from -Fe2O3 nanosheets with exposed {104} facets were successfully prepared by heating Fe(NO3)3 solution containing polyvinyl pyrrolidone (PVP) in air. The -Fe2O3 nanosheets based network structures demonstrate significantly higher response to ethanol and triethylamine than -Fe2O3 sea urchin-like nanostructures and commercial powders. The response to 200 ppb of C2H5OH and 90 ppb of N(C2H5)3 is 1.27 and 1.12, respectively. The excellent sensing performances can be ascribed to the exposed (104) facet terminated with Fe atoms...
July 24, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28737397/conformational-nonequilibrium-enzyme-kinetics-generalized-michaelis-menten-equation
#20
D Evan Piephoff, Jianlan Wu, Jianshu Cao
In a conformational nonequilibrium steady state (cNESS), enzyme turnover is modulated by the underlying conformational dynamics. On the basis of a discrete kinetic network model, we use an integrated probability flux balance method to derive the cNESS turnover rate for a conformation-modulated enzymatic reaction. The traditional Michaelis-Menten (MM) rate equation is extended to a generalized form, which includes non-MM corrections induced by conformational population currents within combined cyclic kinetic loops...
July 24, 2017: Journal of Physical Chemistry Letters
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