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https://www.readbyqxmd.com/read/28738624/multiplexed-analysis-combining-distinctly-sized-cdte-mpa-quantum-dots-and-chemometrics-for-multiple-mutually-interfering-analyte-determination
#1
Dayana B Bittar, David S M Ribeiro, Ricardo N M J Páscoa, José X Soares, S Sofia M Rodrigues, Rafael C Castro, Leonardo Pezza, Helena R Pezza, João L M Santos
Semiconductor quantum dots (QDs) have demonstrated a great potential as fluorescent probes for heavy metals monitoring. However, their great reactivity, whose tunability could be difficult to attain, could impair selectivity yielding analytical results with poor accuracy. In this work, the combination in the same analysis of multiple QDs, each with a particular ability to interact with the analyte, assured a multi-point detection that was not only exploited for a more precise analyte discrimination but also for the simultaneous discrimination of multiple mutually interfering species, in the same sample...
November 1, 2017: Talanta
https://www.readbyqxmd.com/read/28737930/self-collapse-lithography
#2
Chuanzhen Zhao, Xiaobin Xu, Qing Yang, Tianxing Man, Steven Jonas, Jeffrey J Schwartz, Anne M Andrews, Paul S Weiss
We report a facile, high-throughput soft lithography process that utilizes nanoscale channels formed naturally at the edges of microscale relief features on soft, elastomeric stamps. Upon contact with self-assembled monolayer (SAM) functionalized substrates, the roof of the stamp collapses, resulting in the selective removal of SAM molecules via a chemical lift-off process. With this technique, which we call self-collapse lithography (SCL), sub-30-nm patterns were achieved readily using masters with microscale features prepared by conventional photolithography...
July 24, 2017: Nano Letters
https://www.readbyqxmd.com/read/28737683/increased-risk-of-drug-induced-hyponatremia-during-high-temperatures
#3
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/28737164/nanofluidic-chip-for-liquid-tem-cell-fabricated-by-parylene-and-silicon-nitride-direct-bonding
#4
Heejun Jang, Il-Suk Kang, Jihye Kim, Jonghyun Kim, Yun Jeong Cha, Dong Ki Yoon, Wonhee Lee
Despite the importance of nanofluidic TEM chips, a simple fabrication method has yet to be developed due to the difficulty of wafer bonding techniques using a nanoscale thick bonding layer. We present a simple and robust wafer scale bonding technique using parylene as a bonding layer. A nanoscale thick parylene layer was deposited on a SiN wafer and patterned to construct nanofluidic channels. The patterned parylene layer was directly bonded to another SiN wafer by thermal surface activation and bonding, with a bonding strength of ~3 MPa...
July 24, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28736690/decellularization-of-human-internal-mammary-artery-biomechanical-properties-and-histopathological-evaluation
#5
Abdol-Mohammad Kajbafzadeh, Reza Khorramirouz, Seyede Maryam Kameli, Javad Hashemi, Amin Bagheri
This study undertook to create small-diameter vascular grafts and assess their structure and mechanical properties to withstand arterial implantation. Twenty samples of intact human internal mammary arteries (IMAs) were collected and decellularized using detergent-based methods. To evaluate residual cellular and extracellular matrix (ECM) components, histological analysis was performed. Moreover, collagen typing and ECM structure were analyzed by Picrosirius red and Movat's pentachrome staining. Scanning electron microscopy was also applied to assess microarchitecture of both endothelial and adventitial surfaces of native and decellularized arterial samples...
2017: BioResearch Open Access
https://www.readbyqxmd.com/read/28736604/comparison-between-three-glass-fiber-post-cementation-techniques
#6
Guido Migliau, Luca Piccoli, Stefano Di Carlo, Giorgio Pompa, Laith Konstantinos Besharat, Marco Dolci
OBJECTIVE: The aim of this experimental study was to compare the traditional cement systems with those of the latest generation, to assess if indeed these could represent of viable substitutes in the cementation of indirect restorations, and in the specific case of endodontic posts. METHODS: The assessment of the validity of the cementing methods was performed according to the test of the push-out, conducted on sections obtained from the roots of treated teeth. The samples were divided into three groups...
January 2017: Annali di Stomatologia
https://www.readbyqxmd.com/read/28736460/reference-correlation-for-the-viscosity-of-carbon-dioxide
#7
Arno Laesecke, Chris D Muzny
A comprehensive database of experimental and computed data for the viscosity of carbon dioxide (CO2) was compiled and a new reference correlation was developed. Literature results based on an ab initio potential energy surface were the foundation of the correlation of the viscosity in the limit of zero density in the temperature range from 100 K to 2000 K. Guided symbolic regression was employed to obtain a new functional form that extrapolates correctly to T → 0 K and to 10 000 K. Coordinated measurements at low density made it possible to implement the temperature dependence of the Rainwater-Friend theory in the linear-in-density viscosity term...
2017: Journal of Physical and Chemical Reference Data
https://www.readbyqxmd.com/read/28736459/final-report-on-the-key-comparison-ccm-p-k15-in-the-pressure-range-from-1-0-%C3%A3-10-4-pa-to-1-0-pa
#8
Christian Wuethrich, Kenta Arai, Mercede Bergoglio, James A Fedchak, Karl Jousten, Seung Soo Hong, Jorge Torres Guzman
The comparison CCM.P-K15 is a key comparison in pressure involving six laboratories in three regional metrological organizations (RMO). The measurand of the comparison is the accommodation coefficient of two spinning rotating gauge characterized in nitrogen from 0.1 mPa up to 1.0 Pa. The two transfer standards were circulated from November 2009 until March 2011. The circulation consisted of three loops, one for each RMO, and a new calibration by the pilot between each loop. The stability of one of the transfer standards was poor and was worse than expected based on the previous history of the transfer standard while the other transfer standard demonstrated good stability while circulated in Europe and America and a fair stability while circulated in Asia...
2017: Metrologia
https://www.readbyqxmd.com/read/28735734/variation-of-high-intensity-therapeutic-ultrasound-hitu-pressure-field-characterization-effects-of-hydrophone-choice-nonlinearity-spatial-averaging-and-complex-deconvolution
#9
Yunbo Liu, Keith A Wear, Gerald R Harris
Reliable acoustic characterization is fundamental for patient safety and clinical efficacy during high-intensity therapeutic ultrasound (HITU) treatment. Technical challenges, such as measurement variation and signal analysis, still exist for HITU exposimetry using ultrasound hydrophones. In this work, four hydrophones were compared for pressure measurement: a robust needle hydrophone, a small polyvinylidene fluoride capsule hydrophone and two fiberoptic hydrophones. The focal waveform and beam distribution of a single-element HITU transducer (1...
July 20, 2017: Ultrasound in Medicine & Biology
https://www.readbyqxmd.com/read/28733934/draft-genome-sequence-of-the-deep-sea-bacterium-moritella-sp-jt01-and-identification-of-biotechnologically-relevant-genes
#10
Robert Cardoso de Freitas, Estácio Jussie Odisi, Chiaki Kato, Marcus Adonai Castro da Silva, André Oliveira de Souza Lima
Deep-sea bacteria can produce various biotechnologically relevant enzymes due to their adaptations to high pressures and low temperatures. To identify such enzymes, we have sequenced the genome of the polycaprolactone-degrading bacterium Moritella sp. JT01, isolated from sediment samples from Japan Trench (6957 m depth), using a Illumina HiSeq2000 sequencer (12.1 million paired-end reads) and CLC Genomics Workbench (version 6.5.1) for the assembly, resulting in a 4.83-Mb genome (42 scaffolds). The genome was annotated using Rapid Annotation using Subsystem Technology (RAST), Protein Homology/analogY Recognition Engine V 2...
July 22, 2017: Marine Biotechnology
https://www.readbyqxmd.com/read/28733791/current-clinical-evidence-of-tocilizumab-for-the-treatment-of-anca-associated-vasculitis-a-prospective-case-series-for-microscopic-polyangiitis-in-a-combination-with-corticosteroids-and-literature-review
#11
REVIEW
Ryota Sakai, Tsuneo Kondo, Takahiko Kurasawa, Eiko Nishi, Ayumi Okuyama, Kentaro Chino, Akiko Shibata, Yusuke Okada, Hirofumi Takei, Hayato Nagasawa, Koichi Amano
The purpose of this study is to report the efficacy and safety of a combination of tocilizumab (TCZ) and high-dose corticosteroid (CS) in two patients with microscopic polyangiitis (MPA) and review the published current clinical evidence on TCZ in patients with anti-neutrophil cytoplasmic antibody-associated vasculitis (AAV), except for large vessel vasculitis (LVV) and polymyalgia rheumatica (PMR). Two MPA patients were treated with TCZ at 8 mg/kg every month for 1 year and CS (prednisolone 1 mg/kg/day for 2 weeks, followed by tapering) in a prospective single-arm, single-center, cohort, open-label pilot study (UMIN clinical trials: 000012072)...
July 21, 2017: Clinical Rheumatology
https://www.readbyqxmd.com/read/28733651/synthesis-of-renewable-high-density-fuel-with-isophorone
#12
Wei Wang, Yanting Liu, Ning Li, Guangyi Li, Wentao Wang, Aiqin Wang, Xiaodong Wang, Tao Zhang
1,1,3-Trimethyl-5-(2,4,4-trimethylcyclohexyl)cyclohexane, a renewable high density fuel, was first produced in a high overall carbon yield (~70%) with isophorone which can be derived from hemicellulose. The synthetic route used this work contains three steps. In the first step, 3,3,5-trimethylcyclohexanone was synthesized by the selective hydrogenation of isophorone. Among the investigated catalysts, the Pd/C exhibited the highest activity and selectivity. Over this catalyst, a high carbon yield (99.0%) of 3,3,5-trimethylcyclohexanone was achieved under mild conditions (298 K, 2 MPa H2, 1 h)...
July 21, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28733579/the-permeability-of-fractured-rocks-in-pressurised-volcanic-and-geothermal-systems
#13
A Lamur, J E Kendrick, G H Eggertsson, R J Wall, J D Ashworth, Y Lavallée
The connectivity of rocks' porous structure and the presence of fractures influence the transfer of fluids in the Earth's crust. Here, we employed laboratory experiments to measure the influence of macro-fractures and effective pressure on the permeability of volcanic rocks with a wide range of initial porosities (1-41 vol. %) comprised of both vesicles and micro-cracks. We used a hand-held permeameter and hydrostatic cell to measure the permeability of intact rock cores at effective pressures up to 30 MPa; we then induced a macro-fracture to each sample using Brazilian tensile tests and measured the permeability of these macro-fractured rocks again...
July 21, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28731365/chemical-composition-and-antimigraine-activity-of-essential-oil-of-angelicae-dahuricae-radix
#14
Jingbo Sun, He Li, Jinghui Sun, Huimin Liu, Jianguang Chen, Chunmei Wang
The aim of this study was to explore the chemical composition and the effect of essential oil of Angelicae dahuricae radix on a nitroglycerin (NTG)-induced rat model of migraine. The CO2 supercritical fluid extraction method was optimized for the extraction of essential oil of A. dahuricae radix (EOAD) and its chemical composition was determined. The migraine model was established by subcutaneous injection of NTG (10 mg/kg) 1 h after the last administration of EOAD. The therapeutic effect of EOAD and its underlying mechanism were assessed by monitoring behavioral changes, levels of nitric oxide (NO) in serum and brain tissues, plasma levels of calcitonin gene-related peptide (CGRP) and endothelin (ET), and ET/NO ratio...
July 21, 2017: Journal of Medicinal Food
https://www.readbyqxmd.com/read/28731220/mechanically-tunable-bioink-for-3d-bioprinting-of-human-cells
#15
Aurelien Forget, Andreas Blaeser, Florian Miessmer, Marius Köpf, Daniela F Duarte Campos, Nicolas H Voelcker, Anton Blencowe, Horst Fischer, V Prasad Shastri
This study introduces a thermogelling bioink based on carboxylated agarose (CA) for bioprinting of mechanically defined microenvironments mimicking natural tissues. In CA system, by adjusting the degree of carboxylation, the elastic modulus of printed gels can be tuned over several orders of magnitudes (5-230 Pa) while ensuring almost no change to the shear viscosity (10-17 mPa) of the bioink solution; thus enabling the fabrication of 3D structures made of different mechanical domains under identical printing parameters and low nozzle shear stress...
July 21, 2017: Advanced Healthcare Materials
https://www.readbyqxmd.com/read/28731208/super-strong-super-stiff-macrofibers-with-aligned-long-bacterial-cellulose-nanofibers
#16
Sha Wang, Feng Jiang, Xu Xu, Yudi Kuang, Kun Fu, Emily Hitz, Liangbing Hu
With their impressive properties such as remarkable unit tensile strength, modulus, and resistance to heat, flame, and chemical agents that normally degrade conventional macrofibers, high-performance macrofibers are now widely used in various fields including aerospace, biomedical, civil engineering, construction, protective apparel, geotextile, and electronic areas. Those macrofibers with a diameter of tens to hundreds of micrometers are typically derived from polymers, gel spun fibers, modified carbon fibers, carbon-nanotube fibers, ceramic fibers, and synthetic vitreous fibers...
July 21, 2017: Advanced Materials
https://www.readbyqxmd.com/read/28729961/understanding-dual-precipitation-strengthening-in-ultra-high-strength-low-carbon-steel-containing-nano-sized-copper-precipitates-and-carbides
#17
M P Phaniraj, Young-Min Shin, Woo-Sang Jung, Man-Ho Kim, In-Suk Choi
Low carbon ferritic steel alloyed with Ti, Mo and Cu was hot rolled and interrupt cooled to produce nano-sized precipitates of copper and (Ti,Mo)C carbides. The steel had a tensile strength of 840 MPa, an increase in yield strength of 380 MPa over that of the plain carbon steel and reasonable ductility. Transmission electron microscopy and small angle neutron scattering were used to characterize size and volume fraction of the precipitates in the steels designed to form only copper precipitates and only (Ti,Mo)C carbides...
2017: Nano Convergence
https://www.readbyqxmd.com/read/28729671/linking-rheology-and-printability-for-dense-and-strong-ceramics-by-direct-ink-writing
#18
Amin M'Barki, Lydéric Bocquet, Adam Stevenson
Direct ink writing of dense and strong ceramic objects remains an important open challenge. We develop a universal dimensionless criterion for printing such objects. Boehmite, an Al2O3 precursor, was used to assess the rheological properties leading to dense structures in ceramics manufactured by direct ink writing. Boehmite suspensions undergo time dependent gelation, thus providing a rheological laboratory of flow behaviours that can be correlated with printability requirements. We measured the evolution of rheological properties over several days and quantified the deformation of simple printed shapes at different aging times...
July 20, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28729605/evaluating-the-effects-of-material-properties-of-artificial-meniscal-implant-in-the-human-knee-joint-using-finite-element-analysis
#19
Duraisamy Shriram, Gideon Praveen Kumar, Fangsen Cui, Yee Han Dave Lee, Karupppasamy Subburaj
Artificial meniscal implants may replace severely injured meniscus and restore the normal functionality of the knee joint. Implant material stiffness and shape influence the longevity of implantations. This study, using 3D finite element analysis, aimed to evaluate the effects of material stiffness variations of anatomically shaped artificial meniscal implant in the knee joint. Finite element simulations were conducted on five different cases including intact knee, medial meniscectomized knee, and the knee joint with the meniscal implant with three distinct material stiffness...
July 20, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28726876/bioceramic-nanocomposite-thiol-acrylate-polyhipe-scaffolds-for-enhanced-osteoblastic-cell-culture-in-3d
#20
Aaron Lee, Caitlin R Langford, Luis M Rodriguez-Lorenzo, Helmut Thissen, Neil R Cameron
Emulsion-templated (polyHIPE) scaffolds for bone tissue engineering were produced by photopolymerisation of a mixture of trimethylolpropane tris(3-mercaptopropionate) and dipentaerythritol penta-/hexa-acrylate in the presence of hydroxyapatite (HA) or strontium-modified hydroxyapatite (SrHA) nanoparticles. Porous and permeable polyHIPE materials were produced regardless of the type or incorporation level of the bioceramic, although higher loadings resulted in a larger average pore diameter. Inclusion of HA and SrHA into the scaffolds was confirmed by EDX-SEM, FTIR and XPS and quantified by thermogravimetry...
July 20, 2017: Biomaterials Science
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