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https://www.readbyqxmd.com/read/28350764/handgrip-strength-a-population-based-study-of-norms-and-age-trajectories-for-3-to-17-year-olds
#1
Richard W Bohannon, Ying-Chih Wang, Deborah Bubela, Richard C Gershon
PURPOSE: To provide normative values and equations for grip strength obtained from a population-based sample of individuals 3 to 17 years of age. METHODS: This cross-sectional study used grip strength data from 2706 participants (49.2% males, 91% right-hand dominant) in the normative phase of the National Institutes of Health Toolbox project. RESULTS: Analyses showed greater strength in the dominant hand in boys and with each yearly increase in age...
April 2017: Pediatric Physical Therapy
https://www.readbyqxmd.com/read/28350447/self-functionalization-behind-a-solution-processed-niox-film-used-as-hole-transporting-layer-for-efficient-perovskite-solar-cells
#2
John Ciro, Daniel Ramírez, Mario Alejandro Mejía Escobar, Juan Felipe Montoya, Santiago Mesa, Rafael Betancur, Franklin Jaramillo
Fabrication of solution-processed perovskite solar cells (PSCs) requires the deposition of high quality films from precursor inks. Frequently, buffer layers of PSCs are formed from dispersions of metal oxide nanoparticles (NPs). Therefore, the development of trustable methods for the preparation of stable colloidal NPs dispersions is crucial. In this work, a novel approach to form very compact semiconducting buffer layers with suitable optoelectronic properties is presented through a self-functionalization process of the nanocrystalline particles by their own amorphous phase and without adding any other inorganic or organic functionalization component or surfactant...
March 28, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28346885/plasma-and-brain-pharmacokinetics-of-ganoderic-acid-a-in-rats-determined-by-a-developed-uflc-ms-ms-method
#3
Fang-Rui Cao, Bing-Xin Xiao, Li-Sha Wang, Xue Tao, Ming-Zhu Yan, Rui-Le Pan, Yong-Hong Liao, Xin-Min Liu, Qi Chang
Ganoderic acid A (GAA), an active triterpenoid of the traditional Chinese herbal medicine Lingzhi, has been reported to exhibit antinociceptive, antioxidative, and anti-cancer activities. The present study aims to establish a sensitive and rapid UPLC-MS/MS method for studying the plasma and brain pharmacokinetics of GAA in rats. The analytes were separated on a C18 column eluted with a gradient mobile phase consisting of acetonitrile and 0.1% aqueous formic acid at 0.3mL/min. The eluate was monitored by a mass detector using an MRM (m/z, 515...
March 11, 2017: Journal of Chromatography. B, Analytical Technologies in the Biomedical and Life Sciences
https://www.readbyqxmd.com/read/28346782/%C3%AE%C2%BA-carrageenan-enhances-the-biomineralization-and-osteogenic-differentiation-of-electrospun-phb-and-phbv-fibers
#4
Nowsheen Goonoo, Behnam Khanbabaee, Marc Steuber, Archana Bhaw-Luximon, Ulrich Jonas, Ullrich Pietsch, Dhanjay Jhurry, Holger Schönherr
Novel electrospun materials for bone tissue engineering were obtained by blending biodegradable polyhydroxybutyrate (PHB) or polyhydroxybutyrate valerate (PHBV) with the anionic sulfated polysaccharide κ-carrageenan (κ-CG) in varying ratios. In both systems, the two components phase separated as shown by FTIR, DSC and TGA. According to the contact angle data, κ-CG was localized preferentially at the fiber surface in PHBV/ κ-CG blends in contrast to PHB/ κ-CG, where the biopolymer was mostly found within the fiber...
March 27, 2017: Biomacromolecules
https://www.readbyqxmd.com/read/28346746/simultaneous-determination-of-4-hydroxyphenyl-lactic-acid-4-hydroxyphenyl-acetic-acid-and-3-4-hydroxyphenyl-propionic-acid-in-human-urine-by-ultra-high-performance-liquid-chromatography-with-fluorescence-detection
#5
Yongli Yang, Fan Liu, Yiqun Wan
A simple and reliable method was established for simultaneous determination of 4-hydroxyphenyl acetic acid, 4-hydroxyphenyl lactic acid, and 3-4-hydroxyphenyl propionic acid in human urine by high-performance liquid chromatography with fluorescence detection. Solid-phase extraction was used to eliminate the interferences in urine. The separation of three analytes was achieved using a C18 column and a mobile phase formed by a 95:5 v/v mixture of 50 mmol/L ammonium acetate buffer at pH 6.8 that contained 5 mmol/L tetrabutyl ammonium bromide and acetonitrile...
March 27, 2017: Journal of Separation Science
https://www.readbyqxmd.com/read/28346372/-bligh-and-dyer-and-folch-methods-for-solid-liquid-liquid-extraction-of-lipids-from-microorganisms-comprehension-of-solvatation-mechanisms-and-towards-substitution-with-alternative-solvents
#6
Cassandra Breil, Maryline Abert Vian, Thomas Zemb, Werner Kunz, Farid Chemat
Bligh and Dyer (B & D) or Folch procedures for the extraction and separation of lipids from microorganisms and biological tissues using chloroform/methanol/water have been used tens of thousands of times and are "gold standards" for the analysis of extracted lipids. Based on the Conductor-like Screening MOdel for realistic Solvatation (COSMO-RS), we select ethanol and ethyl acetate as being potentially suitable for the substitution of methanol and chloroform. We confirm this by performing solid-liquid extraction of yeast (Yarrowia lipolytica IFP29) and subsequent liquid-liquid partition-the two steps of routine extraction...
March 27, 2017: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/28346142/the-neuropeptide-f-nitric-oxide-pathway-is-essential-for-shaping-locomotor-plasticity-underlying-locust-phase-transition
#7
Li Hou, Pengcheng Yang, Feng Jiang, Qing Liu, Xianhui Wang, Le Kang
Behavioral plasticity is widespread in swarming animals, however little is known about its underlying neural and molecular mechanisms. Here, we report that a neuropeptide F (NPF)/nitric oxide (NO) pathway plays a critical role in the locomotor plasticity of swarming migratory locusts. Two related neuropeptides, NPF1a and NPF2, show reduced levels of their encoding transcripts during crowding, and the transcript levels of their receptors significantly increase during locust isolation. Both of these NPFs have suppressive effects on phase-related locomotor activity...
March 27, 2017: ELife
https://www.readbyqxmd.com/read/28345859/aqueous-nanoparticle-polymer-solar-cells-the-effects-of-surfactant-concentration-and-processing-on-device-performance
#8
Fallon J M Colberts, Martijn M Wienk, René A J Janssen
Polymer solar cells based on PDPP5T and PCBM as donor and acceptor materials have been processed from aqueous nanoparticle miniemulsions. Careful monitoring and optimizing the concentration of free and surface-bound surfactants in the dispersion, by measuring the conductivity and zeta potential, is essential to avoid aggregation of nanoparticles at low concentration and de-wetting of the film at high concentration. The surfactant concentration is crucial for creating reproducible processing conditions that aid in further developing aqueous nanoparticle processed solar cells...
March 27, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28345703/phoretic-motion-of-colloids-in-a-phase-separating-medium
#9
Rajeev Dattani, Enrico F Semeraro, Theyencheri Narayanan
The enhanced motion of dispersed particles driven by a concentration gradient is the basis for diffusiophoresis. Here we present the dynamics of colloids in a phase separating medium probed by X-Ray Photon Correlation Spectroscopy (XPCS) in the ultra-small angle scattering range. Charge stabilized silica colloids suspended in a binary mixture of 3-methylpyridine and water/heavy water are preferentially wetted by 3-methylpyridine and consequently display a phoretic motion towards that phase upon demixing. This activity lasts for hundreds of seconds before the phase separation is complete and the enhanced motion is arrested as the colloids return to normal diffusive dynamics...
March 27, 2017: Soft Matter
https://www.readbyqxmd.com/read/28345350/boron-enhanced-growth-of-micron-length-carbon-based-nanowalls-a-route-towards-high-rates-electrochemical-biosensing
#10
Katarzyna Siuzdak, Mateusz Ficek, Michal Sobaszek, Jacek Ryl, Marcin Gnyba, Paweł Niedziałkowski, Natalia Malinowska, Jakub Karczewski, Robert Bogdanowicz
In this study we have demonstrated the fabrication of novel material called boron-doped carbon nanowalls (B:CNW) which is characterized by remarkable electrochemical properties like high standard rate constant k°, low peak to peak separation value (ΔE) for oxidation and reduction processes of [Fe(CN)6]3-/4- redox system and low surface resistivity. The B:CNW samples were deposited by the microwave plasma assisted chemical vapor deposition (CVD) using a gas mixture of H2:CH4:B2H6 and N2. Growth results in sharp edge, flat and long carbon nanowalls rich in sp2 as well as sp3 hybridized phases...
March 27, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28345017/proof-of-concept-demonstration-of-optimal-composite-mri-endpoints-for-clinical-trials
#11
Steven D Edland, M Colin Ard, Jaiashre Sridhar, Derin Cobia, Adam Martersteck, M Marsel Mesulam, Emily J Rogalski
BACKGROUND: Atrophy measures derived from structural MRI are promising outcome measures for early phase clinical trials, especially for rare diseases such as primary progressive aphasia (PPA), where the small available subject pool limits our ability to perform meaningfully powered trials with traditional cognitive and functional outcome measures. METHODS: We investigated a composite atrophy index in 26 PPA participants with longitudinal MRIs separated by two years...
September 2016: Alzheimer's & Dementia: Translational Research & Clinical Interventions
https://www.readbyqxmd.com/read/28344977/chromatographic-studies-of-protein-based-chiral-separations
#12
Cong Bi, Xiwei Zheng, Shiden Azaria, Sandya Beeram, Zhao Li, David S Hage
The development of separation methods for the analysis and resolution of chiral drugs and solutes has been an area of ongoing interest in pharmaceutical research. The use of proteins as chiral binding agents in high-performance liquid chromatography (HPLC) has been an approach that has received particular attention in such work. This report provides an overview of proteins that have been used as binding agents to create chiral stationary phases (CSPs) and in the use of chromatographic methods to study these materials and protein-based chiral separations...
September 2016: Separations
https://www.readbyqxmd.com/read/28344506/characteristics-of-the-new-phase-in-cdt
#13
J Ambjørn, J Gizbert-Studnicki, A Görlich, J Jurkiewicz, N Klitgaard, R Loll
The approach of Causal Dynamical Triangulations (CDT), a candidate theory of nonperturbative quantum gravity in 4D, turns out to have a rich phase structure. We investigate the recently discovered bifurcation phase [Formula: see text] and relate some of its characteristics to the presence of singular vertices of very high order. The transition lines separating this phase from the "time-collapsed" B-phase and the de Sitter phase [Formula: see text] are of great interest when searching for physical scaling limits...
2017: European Physical Journal. C, Particles and Fields
https://www.readbyqxmd.com/read/28343687/multiple-simultaneous-independent-gradients-for-a-versatile-multidimensional-liquid-chromatography-part-ii-application-2-computer-controlled-ph-gradients-in-the-presence-of-urea-provide-improved-separation-of-proteins-stability-influenced-anion-and-cation-exchange
#14
Allen G Hirsh, Latchezar I Tsonev
This paper details the use of a method of creating controlled pH gradients (pISep) to improve the separation of protein isoforms on ion exchange (IEX) stationary phases in the presence of various isocratic levels of urea. The pISep technology enables the development of computer controlled pH gradients on both cationic (CEX) and anionic (AEX) IEX stationary phases over the very wide pH range from 2 to 12. In pISep, titration curves generated by proportional mixing of the acidic and basic pISep working buffers alone, or in the presence of non-buffering solutes such as the neutral salt NaCl (0-1M), polar organics such as urea (0-8M) or acetonitrile (0-80 Vol%), can be fitted with high fidelity using high order polynomials which, in turn allows construction of a mathematical manifold %A (% acidic pISep buffer) vs...
March 16, 2017: Journal of Chromatography. A
https://www.readbyqxmd.com/read/28343344/simultaneous-detection-of-chlorinated-polycyclic-aromatic-hydrocarbons-with-polycyclic-aromatic-hydrocarbons-by-gas-chromatography-mass-spectrometry
#15
Meng Qiao, Wei Cao, Bochuan Liu, Xu Zhao, Jiuhui Qu
Chlorinated polycyclic aromatic hydrocarbons (ClPAHs), including polychlorinated naphthalenes (PCNs), are hazardous and widespread in the environment, but studies of these substances in the wastewater environment are lacking. In this study, five typical PCNs and five typical ClPAHs (other than PCNs) were simultaneously detected along with their parent polycyclic aromatic hydrocarbons in wastewater samples. All these compounds could be analyzed by gas chromatography- electron ionization mass spectrometry in selected ion monitoring mode and separated on a DB-17ms column...
March 25, 2017: Analytical and Bioanalytical Chemistry
https://www.readbyqxmd.com/read/28343140/sequence-encoded-material-properties-dictate-the-structure-and-function-of-nuclear-bodies
#16
REVIEW
Stephanie C Weber
Concomitant with packaging the genome, the cell nucleus must also spatially organize the nucleoplasm. This complex mixture of proteins and nucleic acids partitions into a variety of phase-separated, membraneless organelles called nuclear bodies. Significant progress has been made in understanding the relationship between the material properties of nuclear bodies and their structural and functional consequences. Furthermore, the molecular basis of these condensed phases is beginning to emerge. Here, I review the latest work in this exciting field, highlighting recent advances and new challenges...
March 23, 2017: Current Opinion in Cell Biology
https://www.readbyqxmd.com/read/28343136/facile-microfluidic-production-of-composite-polymer-core-shell-microcapsules-and-crescent-shaped-microparticles
#17
Ekanem E Ekanem, Zilin Zhang, Goran T Vladisavljević
HYPOTHESIS: Core-shell microcapsules and crescent-shaped microparticles can be used as picolitre bioreactors for cell culture and microwells for cell trapping/immobilisation, respectively. RESULTS: Monodisperse polylactic acid (PLA) core-shell microcapsules with a diameter above 200μm, a shell thickness of 10μm, and 96% water entrapment efficiency were produced by solvent evaporation from microfluidically generated W/O/W emulsion drops with core-shell structure, and used to encapsulate Saccharomyces cerevisiae yeast cells in their aqueous cores...
March 18, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28343131/synthesis-of-mesoporous-poly-melamine-formaldehyde-particles-by-inverse-emulsion-polymerization
#18
Dana Schwarz, Jens Weber
Mesoporous poly(melamine-formaldehyde) (MF) particles with surface areas of up to 200m(2)g(-1) were synthesized by an inverse emulsion polymerization using dodecane and Span80® as continuous phase. The finer details of the shape control (using emulsion techniques) and the porosity control (using silica nanoparticles as hard-template) are discussed. The impact of phase-separation processes on the observable porosity of the 20-200µm sized spherical particles is analysed by gas sorption methods and electron microscopy...
March 16, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28343129/nano-sized-molecularly-imprinted-polymer-for-selective-ultrasound-assisted-microextraction-of-pesticide-carbaryl-from-water-samples-spectrophotometric-determination
#19
A A Bazrafshan, M Ghaedi, Z Rafiee, S Hajati, A Ostovan
Ultrasound-assisted dispersive solid phase microextraction followed by UV-Vis spectrophotometry (UA-DSPME UV-Vis) was designed for the extraction and preconcentration of Carbaryl using nano-sized molecularly-imprinted polymer (MIP-NP). Nano-sized Carbaryl-imprinted polymer was characterized by scanning electron microscopy. A preliminary Plackett-Burman design was applied for screening. Subsequently, central composite design under response surface methodology was used to investigate and model the Carbaryl adsorption as response as well as to optimize this response versus variables such as Carbaryl MIP-NP mass, sonication time, temperature, eluent volume, pH and vortex time...
March 18, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28343078/development-and-validation-of-liquid-chromatography-tandem-mass-spectrometry-method-quantitative-determination-of-polymyxin-b1-polymyxin-b2-polymyxin-b3-and-isoleucine-polymyxin-b1-in-human-plasma-and-its-application-in-clinical-studies
#20
Kim H Hee, Yee K J Leaw, Jun L Ong, Lawrence S Lee
Polymyxin B (PB) is an antibiotic consisting of a cyclic heptapeptide and a tripeptide side chain used in treatment of infections caused by Gram-negative bacteria. Commercial formulations of PB contain multiple structurally related components with major constituents of PB1, PB2, PB3 and ile-PB1. To understand the pharmacokinetics of these major components, we have developed and validated a LC-MS/MS method to quantify PB1, PB2, PB3 and ile-PB1 in human plasma. PB was extracted from plasma by protein precipitation using trichloroacetic acid followed by chromatographic separation on Zorbax Bonus-RP column (100mm×2...
March 14, 2017: Journal of Pharmaceutical and Biomedical Analysis
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