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https://www.readbyqxmd.com/read/28213211/application-of-2d-hplc-coupled-with-principal-component-analysis-to-study-an-industrial-opiate-processing-stream
#1
Paul G Stevenson, Niki K Burns, Stuart D Purcell, Paul S Francis, Neil W Barnett, Fiona Fry, Xavier A Conlan
Principal component analysis (PCA) loading plots were used to elucidate key differences between two-dimensional high performance liquid chromatography (2D-HPLC) fingerprint data from samples collected from stages along the Papaver somniferum industrial process chemistry workflow. Data reduction was completed using a 2D-HPLC peak picking approach as a precursor to chemometric analysis. Using comparisons of the final stages of product extraction as an example, PCA analysis of characteristic 2D-HPLC fingerprints accounted for 84...
May 1, 2017: Talanta
https://www.readbyqxmd.com/read/28211878/pre-descemets-endothelial-keratoplasty-the-pdek-clamp-for-successful-pdek
#2
H S Dua, D G Said
PurposeTo design and produce a clamp that enables good handling of donor sclera-corneal disks, allows air to be injected in the corneal stroma and consistently provides pre-Descemets endothelial keratoplasty (PDEK) tissue by creation of a type-1 big bubble (BB) avoiding a type-2BB by shutting the fenestrations in the periphery of the pre-Descemets layer and preventing escape of air.Patients and methodsA clamp with spring loaded handles attached to two rings of 9 mm diameter and 1 mm width with a side port for insertion of a needle for air injection was designed and produced...
February 17, 2017: Eye
https://www.readbyqxmd.com/read/28211735/resolving-the-pinning-force-of-nanobubbles-with-optical-microscopy
#3
Beng Hau Tan, Hongjie An, Claus-Dieter Ohl
Many of the remarkable properties of surface nanobubbles, such as unusually small contact angles and long lifetimes, are related to the force that pins them onto their substrates. This pinning force is yet to be quantified experimentally. Here, surface-attached nanobubbles are pulled with an atomic force microscope tip while their mechanical responses are observed with total internal reflection fluorescence microscopy. We estimate that a pinning force on the order of 0.1μN is required to unpin a nanobubble from its substrate...
February 3, 2017: Physical Review Letters
https://www.readbyqxmd.com/read/28209428/an-artificial-intelligence-based-improved-classification-of-two-phase-flow-patterns-with-feature-extracted-from-acquired-images
#4
C Shanthi, N Pappa
Flow pattern recognition is necessary to select design equations for finding operating details of the process and to perform computational simulations. Visual image processing can be used to automate the interpretation of patterns in two-phase flow. In this paper, an attempt has been made to improve the classification accuracy of the flow pattern of gas/ liquid two- phase flow using fuzzy logic and Support Vector Machine (SVM) with Principal Component Analysis (PCA). The videos of six different types of flow patterns namely, annular flow, bubble flow, churn flow, plug flow, slug flow and stratified flow are recorded for a period and converted to 2D images for processing...
February 13, 2017: ISA Transactions
https://www.readbyqxmd.com/read/28208356/interaction-coalescence-and-collapse-of-localized-patterns-in-a-quasi-one-dimensional-system-of-interacting-particles
#5
Tommy Dessup, Christophe Coste, Michel Saint Jean
We study the path toward equilibrium of pairs of solitary wave envelopes (bubbles) that modulate a regular zigzag pattern in an annular channel. We evidence that bubble pairs are metastable states, which spontaneously evolve toward a stable single bubble. We exhibit the concept of topological frustration of a bubble pair. A configuration is frustrated when the particles between the two bubbles are not organized in a modulated staggered row. For a nonfrustrated (NF) bubble pair configuration, the bubbles interaction is attractive, whereas it is repulsive for a frustrated (F) configuration...
January 2017: Physical Review. E
https://www.readbyqxmd.com/read/28208335/reynolds-number-effects-on-the-single-mode-richtmyer-meshkov-instability
#6
B Walchli, B Thornber
The Reynolds number effects on the nonlinear growth rates of the Richtmyer-Meshkov instability are investigated using two-dimensional numerical simulations. A decrease in Reynolds number gives an increased time to reach nonlinear saturation, with Reynolds number effects only significant in the range Re<256. Within this range there is a sharp change in instability properties. The bubble and spike amplitudes move towards equal size at lower Reynolds numbers and the bubble velocities decay faster than predicted by Sohn's model [S...
January 2017: Physical Review. E
https://www.readbyqxmd.com/read/28198493/correction-the-magnitude-of-lift-forces-acting-on-drops-and-bubbles-in-liquids-flowing-inside-microchannels
#7
Claudiu A Stan, Audrey K Ellerbee, Laura Guglielmini, Howard A Stone, George M Whitesides
Correction for 'The magnitude of lift forces acting on drops and bubbles in liquids flowing inside microchannels' by Claudiu A. Stan et al., Lab Chip, 2013, 13, 365-376.
February 15, 2017: Lab on a Chip
https://www.readbyqxmd.com/read/28198191/development-of-water-triggered-chitosan-film-containing-glucamylase-for-sustained-release-of-resveratrol
#8
Dongliang Zhang, Yanfei Cao, Chengye Ma, Shanfeng Chen, Hongjun Li
There was a paradox to incorporate enzyme into edible chitosan film that chitosan was dissolved in acid solution and enzyme activity was maintained in mild condition. This study presents a suitable method for maintaining the pH of the chitosan solution at 4-6 to prepare a sustained-release film containing β-cyclodextrin, resveratrol-β-cyclodextrin inclusion (RCI), glucamylase and acetic acid. A considerable amount of resveratrol was released by the glucamylase-incorporated film within 15 days, and the maximum amount released was 46% of the total resveratrol content...
February 15, 2017: Journal of Agricultural and Food Chemistry
https://www.readbyqxmd.com/read/28192942/enhancing-nmr-of-nonrelaxing-species-using-a-controlled-flow-motion-and-a-miniaturized-circuit
#9
Guillaume Carret, Thomas Berthelot, Patrick Berthault
In this article we show that circulation of the sample in a closed-loop circuit combined to microsized detection can lead to a significant signal NMR enhancement. We present an optimized NMR device based on a mini bubble-pump associated with fluidics and microdetection that can be installed on a commercial NMR spectrometer. In addition to a significant signal enhancement for slowly relaxing nuclei, we show that it enables more precise and frequent monitoring of chemical reactions. An additional modification leads to a stopped-flow system very efficient for instance for 2D NMR experiments with long mixing times...
February 10, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28192345/towards-advanced-aeration-modelling-from-blower-to-bubbles-to-bulk
#10
Andreia Amaral, Oliver Schraa, Leiv Rieger, Sylvie Gillot, Yannick Fayolle, Giacomo Bellandi, Youri Amerlinck, Séverine T F C Mortier, Riccardo Gori, Ramiro Neves, Ingmar Nopens
Aeration is an essential component of aerobic biological wastewater treatment and is the largest energy consumer at most water resource recovery facilities. Most modelling studies neglect the inherent complexity of the aeration systems used. Typically, the blowers, air piping, and diffusers are not modelled in detail, completely mixed reactors in a series are used to represent plug-flow reactors, and empirical correlations are used to describe the impact of operating conditions on bubble formation and transport, and oxygen transfer from the bubbles to the bulk liquid...
February 2017: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/28191980/interaction-mechanisms-between-air-bubble-and-molybdenite-surface-impact-of-solution-salinity-and-polymer-adsorption
#11
Lei Xie, Jingyi Wang, Duowei Yuan, Chen Shi, Xin Cui, Hao Zhang, Qi Liu, Qingxia Liu, Hongbo Zeng
The surface characteristics of molybdenite (MoS2) such as wettability and surface interactions have attracted much research interest in a wide range of engineering applications, such as froth flotation. In this work, a bubble probe atomic force microscope (AFM) technique was employed to directly measure the interaction forces between an air bubble and molybdenite mineral surface before/after polymer (i.e., guar gum) adsorption treatment. The AFM imaging showed that the polymer coverage on the surface of molybdenite could achieve ~5...
February 13, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28191583/a-hierarchically-porous-nickel-copper-phosphide-nano-foam-for-efficient-electrochemical-splitting-of-water
#12
Li Wei, Kunli Goh, Özgür Birer, H Enis Karahan, Jian Chang, Shengli Zhai, Xuncai Chen, Yuan Chen
Electrochemical splitting of water to produce oxygen (O2) and hydrogen (H2) through a cathodic hydrogen evolution reaction (HER) and an anodic oxygen evolution reaction (OER) is a promising green approach for sustainable energy supply. Here we demonstrated a porous nickel-copper phosphide (NiCuP) nano-foam as a bifunctional electrocatalyst for highly efficient total water splitting. Prepared from a bubble-templated electrodeposition method and subsequent low-temperature phosphidization, NiCuP has a hierarchical pore structure with a large electrochemical active surface area...
February 13, 2017: Nanoscale
https://www.readbyqxmd.com/read/28188702/control-of-chitin-nanofiber-production-by-the-lipid-producing-diatom-cyclotella-sp-through-fed-batch-addition-of-dissolved-silicon-and-nitrate-in-a-bubble-column-photobioreactor
#13
Omar Chiriboga, Gregory L Rorrer
Diatoms are single-celled algae that make cell walls of nanopatterned biogenic silica called frustules through metabolic uptake of dissolved silicon and its templated condensation into biosilica. The centric marine diatom Cyclotella sp. also produces intracellular lipids and the valued co-product chitin, an N-acetyl glucosamine biopolymer that is extruded from selected frustule pores as pure nanofibers. The goal of this study was to develop a nutrient feeding strategy to control the production of chitin nanofibers from Cyclotella with the co-production of biofuel lipids...
February 11, 2017: Biotechnology Progress
https://www.readbyqxmd.com/read/28188364/a-survey-of-pulmonary-arteriovenous-malformation-screening-management-and-follow-up-in-hereditary-hemorrhagic-telangiectasia-centers-of-excellence
#14
Jeffrey Forris Beecham Chick, Shilpa N Reddy, Reed E Pyeritz, Scott O Trerotola
PURPOSE: To determine current practice regarding screening, management, and follow-up of pulmonary arteriovenous malformations (PAVMs), particularly those with feeding arteries <3 mm in diameter, in those patients with hereditary hemorrhagic telangiectasia (HHT) at HHT Centers of Excellence. MATERIALS AND METHODS: A 32-question survey focusing on PAVM screening, management, and follow-up was sent to 147 participants at HHT Centers worldwide. RESULTS: Thirty-three responses were received (22%); 60% from interventional radiologists and 20% from pulmonologists; 67% from the USA, 21% European, and 6% Asian...
February 10, 2017: Cardiovascular and Interventional Radiology
https://www.readbyqxmd.com/read/28187940/carbon-dioxide-consumption-of-the-microalga-scenedesmus-obtusiusculus-under-transient-inlet-co2-concentration-variations
#15
Juan Cabello, Marcia Morales, Sergio Revah
The extensive microalgae diversity offers considerable versatility for a wide range of biotechnological applications in environmental and production processes. Microalgal cultivation is based on CO2 fixation via photosynthesis and, consequently, it is necessary to evaluate, in a short time and reliable way, the effect of the CO2 gas concentration on the consumption rate and establish the tolerance range of different strains and the amount of inorganic carbon that can be incorporated into biomass in order to establish the potential for industrial scale application...
February 7, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28187330/experimental-effect-of-ozone-upon-the-microbial-flora-of-commercially-produced-dairy-fermented-products
#16
A Alexopoulos, S Plessas, Y Kourkoutas, C Stefanis, S Vavias, C Voidarou, I Mantzourani, E Bezirtzoglou
Ozone was used to control spoilage microorganisms during the manufacturing of dairy products. Ozone stream was applied onto the surface of freshly filled yoghurt cups just before storage for curd development in order to prevent cross contamination from spoilage airborne microorganisms. Accordingly, brine solution was bubbled with ozone for various periods of time and used for ripening of white (feta type) cheese. Both products were subjected to a continuous monitoring of microbial load and also tested for their sensorial properties...
January 27, 2017: International Journal of Food Microbiology
https://www.readbyqxmd.com/read/28182552/bubble-entropy-an-entropy-almost-free-of-parameters
#17
George Manis, Md Aktaruzzaman, Roberto Sassi
OBJECTIVE: A critical point in any definition of entropy is the selection of the parameters employed to obtain an estimate in practice. We propose a new definition of entropy aiming to reduce the significance of this selection. METHODS: We call the new definition Bubble Entropy. Bubble Entropy is based on Permutation Entropy, where the vectors in the embedding space are ranked. We use the bubble sort algorithm for the ordering procedure and count instead the number of swaps performed for each vector...
February 6, 2017: IEEE Transactions on Bio-medical Engineering
https://www.readbyqxmd.com/read/28182298/looking-into-the-puparium-micro-ct-visualization-of-the-internal-morphological-changes-during-metamorphosis-of-the-blow-fly-calliphora-vicina-with-the-first-quantitative-analysis-of-organ-development-in-cyclorrhaphous-dipterans
#18
Daniel Martín-Vega, Thomas J Simonsen, Martin J R Hall
Metamorphosis of cyclorrhaphous flies takes place inside a barrel-like puparium, formed by the shrinking, hardening and darkening of the third-instar larval cuticle. The opacity of this structure hampers the visualization of the morphological changes occurring inside and therefore a full understanding of the metamorphosis process. Here, we use micro-computed tomography (micro-CT) to describe the internal morphological changes that occur during metamorphosis of the blow fly, Calliphora vicina Robineau-Desvoidy 1830 (Diptera: Calliphoridae) at a greater temporal resolution than anything hitherto published...
February 9, 2017: Journal of Morphology
https://www.readbyqxmd.com/read/28182187/multiscale-modeling-of-plasmonic-enhanced-energy-transfer-and-cavitation-around-laser-excited-nanoparticles
#19
Adrien Dagallier, Etienne Boulais, Christos Boutopoulos, Rémi Lachaine, Michel Meunier
Nanoscale bubbles generated around laser-excited metallic nanoparticles are promising candidates for targeted drug and gene delivery in living cells. The development of new nanomaterials for efficient nanobubble-based therapy is however limited by the lack of reliable computational approaches for the prediction of their size and dynamics, due to the wide range of time and space scales involved. In this work, we present a multiscale modeling framework that segregates the various channels of plasmon de-excitation and energy transfer to describe the generation and dynamics of plasmonic nanobubbles...
February 9, 2017: Nanoscale
https://www.readbyqxmd.com/read/28179570/architected-cellular-ceramics-with-tailored-stiffness-via-direct-foam-writing
#20
Joseph T Muth, Patrick G Dixon, Logan Woish, Lorna J Gibson, Jennifer A Lewis
Hierarchical cellular structures are ubiquitous in nature because of their low-density, high-specific properties, and multifunctionality. Inspired by these systems, we created lightweight ceramic architectures composed of closed-cell porous struts patterned in the form of hexagonal and triangular honeycombs by direct foam writing. The foam ink contains bubbles stabilized by attractive colloidal particles suspended in an aqueous solution. The printed and sintered ceramic foam honeycombs possess low relative density (∼6%)...
February 8, 2017: Proceedings of the National Academy of Sciences of the United States of America
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