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https://www.readbyqxmd.com/read/28319401/using-sound-to-study-the-effect-of-frothers-on-the-break-away-of-air-bubbles-at-an-underwater-capillary
#1
Pengbo Chu, Randolph Pax, Ronghao Li, Ray Langlois, James Andrew Finch
Frothers, a class of surfactants, are widely employed in froth flotation to aid the generation of small bubbles. Their action is commonly explained by their ability to hinder coalescence. There are occasional references suggesting that frother may also play a role in the initial break-up of the injected air mass. This work investigates the possible effect of frother on break-up by monitoring air bubbles produced quasi-statically at an underwater capillary. Under this condition, break-up is isolated from coalescence, and an impact of frothers on the detached bubble can be ascribed to an impact on break-up...
March 20, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28317376/all-dielectric-full-color-printing-with-tio2-metasurfaces
#2
Shang Sun, Zhenxing Zhou, Chen Zhang, Yisheng Gao, Zonghui Duan, Shumin Xiao, Qinghai Song
Recently, color generation in resonant nanostructures have been intensively studied. Despite of their exciting progresses, the structural colors are usually generated by the plasmonic resonances of metallic nanoparticles. Due to the inherent plasmon damping, such plasmonic nanostructures are usually hard to create very distinct color impressions. Here we utilize the concept of metasurfaces to produce all-dielectric, low-loss, and high resolution structural colors. We have fabricated TiO2 metasurfaces with electron-beam lithography and a very simple lift-off process...
March 19, 2017: ACS Nano
https://www.readbyqxmd.com/read/28315461/single-or-multi-frequency-generators-in-on-going-brain-activity-a-mechanistic-whole-brain-model-of-empirical-meg-data
#3
Gustavo Deco, Joana Cabral, Mark W Woolrich, Angus B A Stevner, Tim J van Hartevelt, Morten L Kringelbach
During rest, envelopes of band-limited on-going MEG signals co-vary across the brain in consistent patterns, which have been related to resting-state networks measured with fMRI. To investigate the genesis of such envelope correlations, we consider a whole-brain network model assuming two distinct fundamental scenarios: one where each brain area generates oscillations in a single frequency, and a novel one where each brain area can generate oscillations in multiple frequency bands. The models share, as a common generator of damped oscillations, the normal form of a supercritical Hopf bifurcation operating at the critical border between the steady state and the oscillatory regime...
March 14, 2017: NeuroImage
https://www.readbyqxmd.com/read/28303227/analysis-of-cordyceps-by-multi-column-liquid-chromatography
#4
Zhengming Qian, Shaoping Li
Cordyceps is a famous traditional Chinese medicine (TCM) that has been used in China for hundreds of years. In the present study a multi-column liquid chromatography (MC-LC) system was developed for the qualitative analysis of macromolecules and micromolecules in Cordyceps. The MC-LC system includes a size exclusion pre-column, a size exclusion column (SEC) and a reversed phase column (RP) which were controlled by column-switching valves. The sample was separated by the size exclusion pre-column into two fractions (macromolecules and micromolecules)...
March 2017: Acta Pharmaceutica Sinica. B
https://www.readbyqxmd.com/read/28301393/potential-contribution-of-mitochondrial-mt-dna-damage-associated-molecular-patterns-damps-in-transfusion-products-to-the-development-of-acute-respiratory-distress-syndrome-ards-after-multiple-transfusions
#5
Jon D Simmons, Yann-Leei L Lee, Viktor M Pastukh, Gina Capley, Cherry A Muscat, David C Muscat, Michael L Marshall, Sidney B Brevard, Mark N Gillespie
INTRODUCTION: Massive transfusions are accompanied by an increased incidence of a particularly aggressive and lethal form of acute lung injury (delayed TRALI) which occurs >24 hours after transfusions. In light of recent reports showing that mtDNA DAMPs are potent pro-inflammatory mediators, and that their abundance in the sera of severely injured or septic patients is predictive of clinical outcomes, we explored the idea that mtDNA DAMPs are present in transfusion products and are associated with the occurrence of delayed TRALI...
March 15, 2017: Journal of Trauma and Acute Care Surgery
https://www.readbyqxmd.com/read/28301133/chemical-interface-damping-depends-on-electrons-reaching-the-surface
#6
Benjamin Foerster, Anneli Joplin, Katharina Kaefer, Sirin Celiksoy, Stephan Link, Carsten Sönnichsen
Metallic nanoparticles show extraordinary strong light absorption near their plasmon resonance, orders of magnitude larger compared to nonmetallic nanoparticles. This "antenna" effect has recently been exploited to transfer electrons into empty states of an attached material, for example to create electric currents in photovoltaic devices or to induce chemical reactions. It is generally assumed that plasmons decay into hot electrons, which then transfer to the attached material. Ultrafast electron-electron scattering reduces the lifetime of hot electrons drastically in metals and therefore strongly limits the efficiency of plasmon induced hot electron transfer...
March 17, 2017: ACS Nano
https://www.readbyqxmd.com/read/28299697/monitoring-the-cellular-binding-events-with-quartz-crystal-microbalance-qcm-biosensors
#7
Abdul Rehman, Xiangqun Zeng
Quartz crystal microbalance (QCM) biosensors have been demonstrated as noninvasive and label-free tools for cell based measurements. However, the complexity of biofilms composed of cells with the associated liquid environments is preventive towards forming explicit relationship between the added mass and the change in the frequency output signal. Therefore, the protocols of interface design (surface chemistry, interaction mechanism, and data acquisition), data interpretation, and device fabrication, all need to be finely refined in order to make these biosensors prevail in real life...
2017: Methods in Molecular Biology
https://www.readbyqxmd.com/read/28298104/nonclassical-dynamics-of-the-methyl-group-in-1-1-1-triphenylethane-evidence-from-powder-1-h-nmr-spectra
#8
Agnieszka Osior, Przemysław Kalicki, Bohdan Kamieński, Sławomir Szymański, Piotr Bernatowicz, Aleksander Shkurenko
According to the damped quantum rotation (DQR) theory, hindered rotation of methyl groups, evidenced in nuclear magnetic resonance (NMR) line shapes, is a nonclassical process. It comprises a number of quantum-rate processes measured by two different quantum-rate constants. The classical jump model employing only one rate constant is reproduced if these quantum constants happen to be equal. The values of their ratio, or the nonclassicallity coefficient, determined hitherto from NMR spectra of single crystals and solutions range from about 1...
March 14, 2017: Journal of Chemical Physics
https://www.readbyqxmd.com/read/28297990/laser-pulse-compression-using-magnetized-plasmas
#9
Yuan Shi, Hong Qin, Nathaniel J Fisch
Proposals to reach the next generation of laser intensities through Raman or Brillouin backscattering have centered on optical frequencies. Higher frequencies are beyond the range of such methods mainly due to the wave damping that accompanies the higher-density plasmas necessary for compressing higher frequency lasers. However, we find that an external magnetic field transverse to the direction of laser propagation can reduce the required plasma density. Using parametric interactions in magnetized plasmas to mediate pulse compression, both reduces the wave damping and alleviates instabilities, thereby enabling higher frequency or lower intensity pumps to produce pulses at higher intensities and longer durations...
February 2017: Physical Review. E
https://www.readbyqxmd.com/read/28297923/signature-of-nonlinear-damping-in-geometric-structure-of-a-nonequilibrium-process
#10
Eun-Jin Kim, Rainer Hollerbach
We investigate the effect of nonlinear interaction on the geometric structure of a nonequilibrium process. Specifically, by considering a driven-dissipative system where a stochastic variable x is damped either linearly (∝x) or nonlinearly (∝x^{3}) while driven by a white noise, we compute the time-dependent probability density functions (PDFs) during the relaxation towards equilibrium from an initial nonequilibrium state. From these PDFs, we quantify the information change by the information length L, which is the total number of statistically distinguishable states which the system passes through from the initial state to the final state...
February 2017: Physical Review. E
https://www.readbyqxmd.com/read/28297870/dynamics-of-field-driven-population-inversion-in-a-confined-colloidal-mixture
#11
S Chung, S Samin, C Holm, J G Malherbe, S Amokrane
We study, using Langevin dynamics simulations, the change in composition of a binary colloidal mixture confined in a finite-length channel, induced by an external field. The field-induced transition from a near-bulk composition to an inverted population is studied as a function of time, for different field strengths and system parameters. For state points corresponding to reversible field cycles, the cyclic filling and emptying of the channel by the minority species are compared. Extrapolation of the physical relaxation times to the colloidal regime is performed through a series of simulations at increasing value of the damping parameter...
February 2017: Physical Review. E
https://www.readbyqxmd.com/read/28294580/effect-of-cerebrospinal-fluid-modelling-on-spherically-convergent-shear-waves-during-blunt-head-trauma
#12
Amit Madhukar, Ying Chen, Martin Ostoja-Starzewski
The MRI-based computational model, previously validated by tagged MRI and HARP imaging analysis technique on in vivo human brain deformation, is employed to study transient wave dynamics during blunt head trauma. Three different constitutive models are used for the cerebrospinal fluid (CSF): incompressible solid elastic, viscoelastic and fluid-like elastic using an equation of state model. Three impact cases are simulated which indicate that the blunt impacts give rise not only to a fast pressure wave but also to a slow, and potentially much more damaging, shear (distortional) wave that converges spherically towards the brain center...
March 14, 2017: International Journal for Numerical Methods in Biomedical Engineering
https://www.readbyqxmd.com/read/28290545/tailored-fano-resonance-and-localized-electromagnetic-field-enhancement-in-ag-gratings
#13
Zhaozhu Li, J Michael Klopf, Lei Wang, Kaida Yang, Rosa A Lukaszew
Metallic gratings can support Fano resonances when illuminated with EM radiation, and their characteristic reflectivity versus incident angle lineshape can be greatly affected by the surrounding dielectric environment and the grating geometry. By using conformal oblique incidence thin film deposition onto an optical grating substrate, it is possible to increase the grating amplitude due to shadowing effects, thereby enabling tailoring of the damping processes and electromagnetic field couplings of the Fano resonances, hence optimizing the associated localized electric field intensity...
March 14, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28287953/quantitative-comparison-of-spherical-deconvolution-approaches-to-resolve-complex-fiber-configurations-in-diffusion-mri-isra-based-vs-l2l0-sparse-methods
#14
Alfonso Mastropietro, Paola Scifo, Giovanna Rizzo
OBJECTIVE: To quantitatively compare different Spherical Deconvolution (SD) approaches (ISRA-based and sparse L2L0 algorithms) to resolve crossing fiber in diffusion MRI. The purpose of this comparison is to address the area of application in which each approach could better perform. METHODS: ISRA-based (Richardson-Lucy (RL), damped-RL) and sparse L2L0 algorithms were implemented and evaluated on both simulated data and in vivo datasets. Simulations were performed at different crossing angles (30° to 90°), b-values (1000 to 3000 s/mm (2) ), SNR (10 to 30), number of fibers (1 to 3)...
March 6, 2017: IEEE Transactions on Bio-medical Engineering
https://www.readbyqxmd.com/read/28286376/high-mobility-group-box-1-protein-and-outcomes-in-critically-ill-surgical-patients-requiring-open-abdominal-management
#15
Michelle S Malig, Craig N Jenne, Chad G Ball, Derek J Roberts, Zhengwen Xiao, Andrew W Kirkpatrick
Background. Previous studies assessing various cytokines in the critically ill/injured have been uninformative in terms of translating to clinical care management. Animal abdominal sepsis work suggests that enhanced intraperitoneal (IP) clearance of Damage-Associated Molecular Patterns (DAMPs) improves outcome. Thus measuring the responses of DAMPs offers alternate potential insights and a representative DAMP, High Mobility Group Box-1 protein (HMGB-1), was considered. While IP biomediators are being recognized in critical illness/trauma, HMGB-1 behaviour has not been examined in open abdomen (OA) management...
2017: Mediators of Inflammation
https://www.readbyqxmd.com/read/28286042/the-therapeutic-effects-of-periploca-forrestii-schltr-stem-extracts-on-collagen-induced-arthritis-by-inhibiting-the-activation-of-src-nf-%C3%AE%C2%BAb-signaling-pathway-in-rats
#16
Lei Chen, Jinsong Li, Xuan Ke, Wei Qu, Jie Zhang, Feng Feng, Wenyuan Liu
ETHNOPHARMACOLOGICAL RELEVANCE: Periploca forrestii Schltr. is a classical traditional Chinese medicine (TCM) called Heilonggu (HLG) in China. According to the theory of TCM, it possesses the efficacy of eliminating wind and removing dampness. In clinical practice, it is commonly used for the treatment of rheumatoid arthritis. The present work aimed to evaluate the anti-rheumatism activity of HLG ethanol extract and reveal the underlying molecular mechanism by employing an animal model of collagen-induced rheumatoid arthritis (CIA) in rats...
March 7, 2017: Journal of Ethnopharmacology
https://www.readbyqxmd.com/read/28284980/the-kingston-allergy-birth-cohort-exploring-parentally-reported-respiratory-outcomes-through-the-lens-of-the-exposome
#17
Michelle L North, Jeffrey R Brook, Elizabeth Y Lee, Vanessa Omana, Nadia M Daniel, Lisa M Steacy, Greg J Evans, Miriam L Diamond, Anne K Ellis
BACKGROUND: The Kingston Allergy Birth Cohort (KABC) is a prenatally recruited cohort initiated to study the developmental origins of allergic disease. Kingston General Hospital was chosen for recruitment because it serves a population with notable diversity in environmental exposures relevant to the emerging concept of the exposome. OBJECTIVES: To establish a profile of the KABC using the exposome framework and examine parentally reported respiratory symptoms to 2 years of age...
March 8, 2017: Annals of Allergy, Asthma & Immunology
https://www.readbyqxmd.com/read/28276805/the-protective-effects-of-social-bonding-on-behavioral-and-pituitary-adrenal-axis-reactivity-to-chronic-mild-stress-in-prairie-voles
#18
Neal McNeal, Katherine M Appleton, Alan Kim Johnson, Melissa-Ann L Scotti, Joshua Wardwell, Rachel Murphy, Christina Bishop, Alison Knecht, Angela J Grippo
Positive social interactions may protect against stress. This study investigated the beneficial effects of pairing with a social partner on behaviors and neuroendocrine function in response to chronic mild stress (CMS) in 13 prairie vole pairs. Following 5 days of social bonding, male and female prairie voles were exposed to 10 days of CMS (mild, unpredictable stressors of varying durations, for instance, strobe light, white noise, and damp bedding), housed with either the social partner (paired group) or individually (isolated group)...
March 5, 2017: Stress: the International Journal on the Biology of Stress
https://www.readbyqxmd.com/read/28275816/genetic-mapping-and-haplotype-analysis-of-a-locus-for-quantitative-resistance-to-fusarium-graminearum-in-soybean-accession-pi-567516c
#19
Peng Cheng, Cassidy R Gedling, Gunvant Patil, Tri D Vuong, J Grover Shannon, Anne E Dorrance, Henry T Nguyen
A major novel quantitative disease resistance locus, qRfg_Gm06, for Fusarium graminearum was genetically mapped to chromosome 6. Genomic-assisted haplotype analysis within this region identified three putative candidate genes. Fusarium graminearum causes seed, root rot, and seedling damping-off in soybean which contributes to reduced stands and yield. A cultivar Magellan and PI 567516C were identified with low and high levels of partial resistance to F. graminearum, respectively. Quantitative disease resistance loci (QDRL) were mapped with 241 F7:8 recombinant inbred lines (RILs) derived from a cross of Magellan × PI 567516C...
March 8, 2017: TAG. Theoretical and Applied Genetics. Theoretische und Angewandte Genetik
https://www.readbyqxmd.com/read/28275293/therapeutic-mechanism-of-y%C3%A4-n-ch%C3%A3-n-h%C3%A4-o-decoction-in-hepatic-diseases
#20
REVIEW
Jian-Yuan Li, Hong-Yan Cao, Lin Sun, Run-Fei Sun, Chao Wu, Yan-Qin Bian, Shu Dong, Ping Liu, Ming-Yu Sun
Yīn-Chén-Hāo decoction (YCHD) is a traditional Chinese medicine formula composed of capillaris (Artemisia capillaris), gardenia (Gardenia jasminoides), and rhubarb (Rheum rhabarbarum) that is used for the treatment of damp-heat jaundice. In modern clinics, YCHD is mostly used for hepatic diseases. This review summarizes the biological activities of YCHD and its medical applications. The main active compounds of YCHD are chlorogenic acid, rhein, geniposide, emodin, and scoparone. The pharmacological actions of YCHD include inhibition of hepatic steatosis, apoptosis, necrosis, anti-inflammation, and immune regulation...
February 21, 2017: World Journal of Gastroenterology: WJG
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