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https://www.readbyqxmd.com/read/28527299/role-of-pickering-stabilization-and-bulk-gelation-for-the-preparation-and-properties-of-solid-silica-foams
#1
I Lesov, S Tcholakova, M Kovadjieva, T Saison, M Lamblet, N Denkov
Foaming of particulate suspensions, followed by foam drying, is developed as an efficient method for production of highly porous materials with various applications. A key factor for success is the appropriate choice of surfactants which both modify the particle surface and stabilize the foam. Here we compare the efficiency of this method for silica suspensions containing two surfactants which lead to very different types of foam stabilization. Cationic TTAB leads to particle-stabilized foams (Pickering stabilization) whereas zwitterionic CAPB - to surfactant-stabilized foams...
May 12, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28527191/understanding-how-a-sport-helmet-protects-the-head-from-closed-injury-by-virtual-impact%C3%A2-tests
#2
Yunhua Luo, Zhaoyang Liang
Understanding how a helmet protects the head, especially the soft brain tissues, is the prerequisite for improving helmet design. Intracranial pressure and stresses/strains in the brain tissues are the direct indicators of traumatic brain injury and they can be used to measure helmet performance. In this study, the effects of helmet design parameters such as the helmet shell stiffness, liner compliance and thickness on the brain injury indicators were investigated by virtual impact tests. A finite element head model (FEHM) was first constructed from medical images; a personally-fitted helmet made of composite material and foam was virtually prototyped using geometric information extracted from the FEHM; a helmet-head finite element model was then assembled...
2017: Bio-medical Materials and Engineering
https://www.readbyqxmd.com/read/28527187/quantitative-stereological-analysis-of-the-highly-porous-hydroxyapatite-scaffolds-using-x-ray-cm-and-sem
#3
Justyna Zygmuntowicz, Aneta Zima, Joanna Czechowska, Karol Szlazak, Anna Ślosarczyk, Katarzyna Konopka
BACKGROUND: Material properties of the scaffolds as well as their microstructure are vital in determining in vivo cellular response. Three-dimensional (3D), highly porous scaffolds are used in tissue engineering to provide a suitable microenvironment and to support regeneration of bone. Both pore sizes and their architecture, in particular interconnection density, impact functionality of scaffold during its biomedical applications. OBJECTIVE: In this paper a comparative study of the microstructure of highly porous hydroxyapatite scaffolds produced via gelcasting of foamed slurries and replication of polyurethane sponge were carried out...
2017: Bio-medical Materials and Engineering
https://www.readbyqxmd.com/read/28526345/facile-fabrication-of-3d-porous-hybrid-sphere-by-co-immobilization-of-multi-enzyme-directly-from-cell-lysates-as-an-efficient-and-recyclable-biocatalyst-for-asymmetric-reduction-with-coenzyme-regeneration-in-situ
#4
MinganYu, Duqiang Liu, Lili Sun, Jing Li, Qian Chen, Lijun Pan, Jingchuan Shang, Shurong Zhang, Wei Li
Ni(2+)-agarose bead-wrapped multi-enzyme/inorganic hybrid sphere composed of the immobilized enzymes as organic component and NaH2PO4 and NaCl as inorganic component was developed by co-immobilizing extracellular His-tagged 3-quinuclidinone reductases and glucose dehydrogenase without pre-purification. The resulting biocatalysts has 3D porous architectures as confirmed by SEM and FESEM, and it enabled the continuous biotransformation of 3-quinuclidone to (R)-3-quinuclidinol with cofactor regeneration in situ...
May 16, 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/28522809/nickel-cobalt-sulfide-core-shell-structure-on-3d-graphene-for-supercapacitor-application
#5
Lemu Girma Beka, Xin Li, Weihua Liu
Three-dimensional (3D) core/shell structure of nickel cobalt sulfide is nano-engineered by using series of hydrothermal steps on a CVD grown graphene for supercapacitor application. This core/shell is composited of NiCo2S4 nanotube (NCS) as core and CoxNi(3-x)S2 (CNS) nanosheets as a shell. The as-synthesized composite exhibits excellent electrochemical properties by using the advantage of NCS nanontube core as superhighway for electron and ion transport, and CNS nanosheets shell as high active area pseudocapacitive material...
May 18, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28522412/athero-inflammatory-nanotherapeutics-ferulic-acid-based-poly-anhydride-ester-nanoparticles-attenuate-foam-cell-formation-by-regulating-macrophage-lipogenesis-and-reactive-oxygen-species-generation
#6
Rebecca A Chmielowski, Dalia S Abdelhamid, Jonathan J Faig, Latrisha K Petersen, Carol R Gardner, Kathryn E Uhrich, Laurie B Joseph, Prabhas V Moghe
Enhanced bioactive anti-oxidant formulations are critical for treatment of inflammatory diseases, such as atherosclerosis. A hallmark of early atherosclerosis is the uptake of oxidized low density lipoprotein (oxLDL) by macrophages, which results in foam cell and plaque formation in the arterial wall. The hypolipidemic, anti-inflammatory, and antioxidative properties of polyphenol compounds make them attractive targets for treatment of atherosclerosis. However, high concentrations of antioxidants can reverse their anti-atheroprotective properties and cause oxidative stress within the artery...
May 15, 2017: Acta Biomaterialia
https://www.readbyqxmd.com/read/28522235/a-review-of-terrestrial-aerial-and-aquatic-keratins-the-structure-and-mechanical-properties-of-pangolin-scales-feather-shafts-and-baleen-plates
#7
Bin Wang, Tarah N Sullivan
Keratinous materials, omnipresent as the hard and durable epidermal appendages of animals, are one of the toughest biological materials. They exhibit diverse morphologies and structures that serve a variety of amazing and inspiring mechanical functions. In this work, we provide a review of representative terrestrial, aerial and aquatic keratinous materials, pangolin scales, feather shafts and baleen plates, and correlate their hierarchical structures to respective functions of dermal armor, flight material and undersea filter...
May 8, 2017: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/28521576/rethinking-the-foam-cosmesis-for-people-with-lower-limb-absence
#8
Nicola Cairns, Jonathan Corney, Kevin Murray, Karena Moore-Millar, Gillian D Hatcher, Saeed Zahedi, Richard Bradbury, Joe McCarthy
BACKGROUND AND AIM: A recent survey of people with lower limb absence revealed that patients' satisfaction with their foam cosmesis is lower than desired. The aim of this project was to improve the lifelike appearance, functionality and durability of the cosmesis through a user-centred design methodology. TECHNIQUE: Concept development and prototyping led to a new cosmesis design which features a cut-out located at the knee, inserted with an artificial patella made of a more rigid foam...
May 1, 2017: Prosthetics and Orthotics International
https://www.readbyqxmd.com/read/28520734/interfacial-mechanisms-for-stability-of-surfactant-laden-films
#9
M Saad Bhamla, Chew Chai, Marco A Àlvarez-Valenzuela, Javier Tajuelo, Gerald G Fuller
Thin liquid films are central to everyday life. They are ubiquitous in modern technology (pharmaceuticals, coatings), consumer products (foams, emulsions) and also serve vital biological functions (tear film of the eye, pulmonary surfactants in the lung). A common feature in all these examples is the presence of surface-active molecules at the air-liquid interface. Though they form only molecular-thin layers, these surfactants produce complex surface stresses on the free surface, which have important consequences for the dynamics and stability of the underlying thin liquid film...
2017: PloS One
https://www.readbyqxmd.com/read/28520604/in-vitro-evaluation-of-betafoam-a-new-polyurethane-foam-dressing
#10
Jae-A Jung, Seung-Kyu Han, Seong-Ho Jeong, Eun-Sang Dhong, Kang-Gyun Park, Woo-Kyung Kim
BACKGROUND: A new polyurethane foam dressing impregnated with 3% povidone-iodine (Betafoam; Genewell, Seoul, Korea) was recently developed based on the hypothesis that its physical properties, including improved moisture-retention capacity and antimicrobial activity, are at least as good as those achieved with the current foam dressings that contain silver, but also associated with reduced cost and cytotoxicity to host cells. The purpose of this in vitro study was to evaluate the efficacy of Betafoam by comparing its physical properties, antimicrobial activity, and cytotoxicity with those of 3 silver foam dressings (Allevyn-Ag [Smith & Nephew, Hull, United Kingdom]; Mepilex-Ag [Mölnlycke Health Care, Gothenburg, Sweden]; and PolyMem-Ag [Ferris MFG Corp, Burr Ridge, Illinois]) used worldwide...
June 2017: Advances in Skin & Wound Care
https://www.readbyqxmd.com/read/28516808/implication-of-foam-sclerosant-inactivation-by-human-whole-blood-in-a-laboratory-setting
#11
Emma B Dabbs, Scott J Dos Santos, Laurensius E Mainsiouw, Alina A Sheikh, Alexis Gkantiragas, Irenie Shiangoli, Mike R Watkins, Jaya L Nemchand, Mark S Whiteley
Background During sclerotherapy, it has been recommended to confirm intravenous placement of the needle by aspirating blood into the sclerosant syringe. This may inactivate some, or all of the sclerosant. Aims To quantify the volume of human blood needed to completely inactivate 1 ml of sodium tetradecyl sulphate, and comparing fresh blood and blood that has been stored in an ethylenediaminetetraacetic acid tube. Methods A series of manual titrations were carried out following a procedure developed at STD Pharmaceutical Products Ltd (Hereford, UK) and listed in the British Pharmacopeia...
January 1, 2017: Phlebology
https://www.readbyqxmd.com/read/28515979/comparison-of-video-guided-live-instructed-and-self-guided-foam-roll-interventions-on-knee-joint-range-of-motion-and-pressure-pain-threshold-a-randomized-controlled-trial
#12
Scott W Cheatham, Morey J Kolber, Matt Cain
BACKGROUND: The use of foam rollers to provide tissue massage is a commonly used intervention by rehabilitation professionals for their patients and clients. Currently, there is no consensus on the optimal foam rolling treatment approach. Of particular interest are the effects of different instructional methods of foam rolling, as individuals ultimately perform these interventions independently outside of formal care. Finding the optimal instructional method may help improve the individual's understanding of the technique, allowing for a safe and effective intervention...
April 2017: International Journal of Sports Physical Therapy
https://www.readbyqxmd.com/read/28515713/energy-efficiency-and-productivity-enhancement-of-microbial-electrosynthesis-of-acetate
#13
Edward V LaBelle, Harold D May
It was hypothesized that a lack of acetogenic biomass (biocatalyst) at the cathode of a microbial electrosynthesis system, due to electron and nutrient limitations, has prevented further improvement in acetate productivity and efficiency. In order to increase the biomass at the cathode and thereby performance, a bioelectrochemical system with this acetogenic community was operated under galvanostatic control and continuous media flow through a reticulated vitreous carbon (RVC) foam cathode. The combination of galvanostatic control and the high surface area cathode reduced the electron limitation and the continuous flow overcame the nutrient limitation while avoiding the accumulation of products and potential inhibitors...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28515647/comparative-study-on-compositions-and-functional-properties-of-porcine-chicken-and-duck-blood
#14
Supaluk Sorapukdee, Supawadee Narunatsopanon
Hematological, chemical and functional characteristics of porcine, chicken and duck blood were evaluated. A porcine blood sample showed the most abundant red blood cell, hemoglobin concentration, packed cell volume and plasma protein content as well as its freeze-dried blood possessed the highest contents of protein, fat, Cu and Cr with the highest percentage of heme iron (p<0.05). Unlike porcine blood, chicken blood showed a well balance in some essential amino acids, specifically for a higher isoleucine content (p<0...
2017: Korean Journal for Food Science of Animal Resources
https://www.readbyqxmd.com/read/28514839/occurrence-of-brominated-dioxins-in-a-study-using-various-firefighting-methods
#15
Filip Bjurlid, Anna Kärrman, Niklas Ricklund, Jessika Hagberg
The use of different firefighting methods influences how fast a fire is extinguished and how fast the temperature drops in the area affected by the fire. These differences may also influence the formation of harmful pollutants during firefighting of an accidental fire. The aim was to study occurrence of brominated dibenzo-p-dioxins and furans (PBDD/Fs) in gas and soot during five fire scenarios resembling a small apartment fire and where different firefighting methods were used. Samples of gas and soot were taken both during the buildup of the fire and during the subsequent extinguishing of the fire while using different firefighting methods (nozzle, compressed air foam system, cutting extinguisher) and an extinguishing additive...
May 13, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28513729/stable-small-bubble-clusters-in-two-dimensional-foams
#16
Kai Zhang, Chin-Chang Kuo, Nathaniel See, Corey O'Hern, Michael Dennin
Key features of the mechanical response of amorphous particulate materials, such as foams, emulsions, and granular media, to applied stress are determined by the frequency and size of particle rearrangements that occur as the system transitions from one mechanically stable state to another. This work describes coordinated experimental and computational studies of bubble rafts, which are quasi-two dimensional systems of bubbles confined to the air-water interface. We focus on small mechanically stable clusters of four, five, six, and seven bubbles with two different sizes with diameter ratio σL/σS ≃ 1...
May 17, 2017: Soft Matter
https://www.readbyqxmd.com/read/28513620/efficient-hydrogen-production-on-moni4-electrocatalysts-with-fast-water-dissociation-kinetics
#17
Jian Zhang, Tao Wang, Pan Liu, Zhongquan Liao, Shaohua Liu, Xiaodong Zhuang, Mingwei Chen, Ehrenfried Zschech, Xinliang Feng
Various platinum-free electrocatalysts have been explored for hydrogen evolution reaction in acidic solutions. However, in economical water-alkali electrolysers, sluggish water dissociation kinetics (Volmer step) on platinum-free electrocatalysts results in poor hydrogen-production activities. Here we report a MoNi4 electrocatalyst supported by MoO2 cuboids on nickel foam (MoNi4/MoO2@Ni), which is constructed by controlling the outward diffusion of nickel atoms on annealing precursor NiMoO4 cuboids on nickel foam...
May 17, 2017: Nature Communications
https://www.readbyqxmd.com/read/28512701/estimation-of-3d-ground-reaction-force-using-nanocomposite-piezo-responsive-foam-sensors-during-walking
#18
Parker G Rosquist, Gavin Collins, A Jake Merrell, Noelle J Tuttle, James B Tracy, Evan T Bird, Matthew K Seeley, David T Fullwood, William F Christensen, Anton E Bowden
This paper describes a method for the estimation of the 3D ground reaction force (GRF) during human walking using novel nanocomposite piezo-responsive foam (NCPF) sensors. Nine subjects (5 male, 4 female) walked on a force-instrumented treadmill at 1.34 m/s for 120 s each while wearing a shoe that was instrumented with four NCPF sensors. GRF data, measured via the treadmill, and sensor data, measured via the NCPF inserts, were used in a tenfold cross validation process to calibrate a separate model for each individual...
May 16, 2017: Annals of Biomedical Engineering
https://www.readbyqxmd.com/read/28511517/holistic-healing-through-herbs-effectiveness-of-aloe-vera-on-post-extraction-socket-healing
#19
Vijaya Lakshmi Nimma, Harsha Vardhan Talla, Jaya Krishna Bairi, Madhulatha Gopaldas, Haritha Bathula, Sandeep Vangdoth
INTRODUCTION: Advances in the field of alternative medicine has encouraged the use of various natural products for multiple uses in the field of dentistry for treatment of various oral diseases. A natural herbal product is Aloe vera, which has number of benefits with no reported side effects and gaining considerable importance in clinical research. AIM: The aim of this cross-sectional randomized interventional study was to evaluate the effectiveness of Aloe vera in the healing of post extraction sockets...
March 2017: Journal of Clinical and Diagnostic Research: JCDR
https://www.readbyqxmd.com/read/28510440/fundamental-characterization-of-the-micellar-self-assembly-of-sophorolipid-esters
#20
Amanda Koh, Katherine Todd, Ezekiel Sherbourne, Richard A Gross
Surfactants are ubiquitous constituents of commercial and biological systems that function based on complex structure-dependent interactions. Sophorolipid (SL) n-alkyl esters (SL-esters) comprise a group of modified naturally derived glycolipids from Candida bombicola. Herein, micellar self-assembly behavior as a function of SL-ester chain length was studied. Surface tensions as low as 31.2 mN/m and critical micelle concentrations (CMCs) as low as 1.1µM were attained for diacetylated SL-decyl ester (dASL-DE) and SL-octyl ester, respectively...
May 16, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
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