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https://www.readbyqxmd.com/read/27911819/programmable-and-reversible-plasmon-mode-engineering
#1
Ankun Yang, Alexander J Hryn, Marc R Bourgeois, Won-Kyu Lee, Jingtian Hu, George C Schatz, Teri W Odom
Plasmonic nanostructures with enhanced localized optical fields as well as narrow linewidths have driven advances in numerous applications. However, the active engineering of ultranarrow resonances across the visible regime-and within a single system-has not yet been demonstrated. This paper describes how aluminum nanoparticle arrays embedded in an elastomeric slab may exhibit high-quality resonances with linewidths as narrow as 3 nm at wavelengths not accessible by conventional plasmonic materials. We exploited stretching to improve and tune simultaneously the optical response of as-fabricated nanoparticle arrays by shifting the diffraction mode relative to single-particle dipolar or quadrupolar resonances...
November 28, 2016: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/27901230/esthetic-perception-of-orthodontic-appliances-by-brazilian-children-and-adolescents
#2
Deise Caldas Kuhlman, Tatiana Araújo de Lima, Candice Belchior Duplat, Jonas Capelli
Objective: The objective of this present study was to understand how children and adolescents perceive esthetic attractiveness of a variety of orthodontic appliances. It also analyzed preferences according to patients' age, sex and socioeconomic status. Methods: A photograph album consisting of eight photographs of different orthodontic appliances and clear tray aligners placed in a consenting adult with pleasing smile was used. A sample of children or adolescents aged between 8 and 17 years old (n = 276) was asked to rate each image for its attractiveness on a visual analog scale...
September 2016: Dental Press Journal of Orthodontics
https://www.readbyqxmd.com/read/27901229/color-changes-of-esthetic-orthodontic-ligatures-evaluated-by-orthodontists-and-patients-a-clinical-study
#3
Edilene Kawabata, Vera Lucia Dantas, Carlos Brito Kato, David Normando
Objective: To evaluate in vivo changes in the color of esthetic elastomeric ligatures from different manufacturers. Methods: Four widely used commercial brands of elastomeric ligatures were selected and used in 20 adult patients in a split-mouth design. The ligatures were evaluated by orthodontists and patients in a double-blind manner on the day the ligatures were placed (T0) and 30 days after intraoral exposure (T1) by means of a system of staining scores. Groups were compared by Friedman test with p < 0...
September 2016: Dental Press Journal of Orthodontics
https://www.readbyqxmd.com/read/27881241/complications-after-use-of-elastomeric-pressure-indicating-media-at-24-hour-follow-up-visit-for-immediate-maxillary-complete-removable-dental-prosthesis-a-clinical-report
#4
Lisa Kane, Elizabeth A Van Tubergen, Sindhura A Allareddy
Various pressure-indicating media are available to assess the adaptation of the intaglio surface of a removable dental prosthesis at the insertion and follow-up appointments. This clinical report describes the use of an elastomer that entered the maxillary sinus through an undetected oroantral communication at the 24-hour follow-up for an immediate maxillary complete removable dental prosthesis. A Caldwell-Luc sinusotomy procedure was required to remove the material, and the patient required over 1 year of healing time before his reported symptoms resolved...
November 20, 2016: Journal of Prosthetic Dentistry
https://www.readbyqxmd.com/read/27869548/evaluation-of-a-sprinkler-cooling-system-on-inhalable-dust-and-ammonia-concentrations-in-broiler-chicken-production
#5
S Williams Ischer, M B Farnell, G T Tabler, M Moreira, P T O'Shaughnessy, M W Nonnenmann
Workers are exposed to dust in broiler chicken production during daily work activities. Poultry dust may contain inflammatory agents (e.g., endotoxin) and inhalation exposure has been associated with pulmonary symptoms. Current practice to reduce worker exposure to poultry dust is the use of respiratory protection (e.g., elastomeric face-piece respirator with a P100 and ammonia chemical cartridge). Limited research has been conducted to evaluate engineering controls to reduce dust and ammonia concentrations in broiler chicken production; therefore, the purpose of this research was to evaluate the effectiveness of a water sprinkling system to reduce inhalable dust and ammonia concentrations in a broiler chicken house...
January 2017: Journal of Occupational and Environmental Hygiene
https://www.readbyqxmd.com/read/27856795/an-injectable-shear-thinning-biomaterial-for-endovascular-embolization
#6
Reginald K Avery, Hassan Albadawi, Mohsen Akbari, Yu Shrike Zhang, Michael J Duggan, Dushyant V Sahani, Bradley D Olsen, Ali Khademhosseini, Rahmi Oklu
Improved endovascular embolization of vascular conditions can generate better patient outcomes and minimize the need for repeat procedures. However, many embolic materials, such as metallic coils or liquid embolic agents, are associated with limitations and complications such as breakthrough bleeding, coil migration, coil compaction, recanalization, adhesion of the catheter to the embolic agent, or toxicity. Here, we engineered a shear-thinning biomaterial (STB), a nanocomposite hydrogel containing gelatin and silicate nanoplatelets, to function as an embolic agent for endovascular embolization procedures...
November 16, 2016: Science Translational Medicine
https://www.readbyqxmd.com/read/27856307/mechanoresponsive-materials-for-drug-delivery-harnessing-forces-for-controlled-release
#7
REVIEW
Julia Wang, Jonah A Kaplan, Yolonda L Colson, Mark W Grinstaff
Mechanically-activated delivery systems harness existing physiological and/or externally-applied forces to provide spatiotemporal control over the release of active agents. Current strategies to deliver therapeutic proteins and drugs use three types of mechanical stimuli: compression, tension, and shear. Based on the intended application, each stimulus requires specific material selection, in terms of substrate composition and size (e.g., macrostructured materials and nanomaterials), for optimal in vitro and in vivo performance...
November 14, 2016: Advanced Drug Delivery Reviews
https://www.readbyqxmd.com/read/27826498/functional-diversity-of-resilin-in-arthropoda
#8
REVIEW
Jan Michels, Esther Appel, Stanislav N Gorb
Resilin is an elastomeric protein typically occurring in exoskeletons of arthropods. It is composed of randomly orientated coiled polypeptide chains that are covalently cross-linked together at regular intervals by the two unusual amino acids dityrosine and trityrosine forming a stable network with a high degree of flexibility and mobility. As a result of its molecular prerequisites, resilin features exceptional rubber-like properties including a relatively low stiffness, a rather pronounced long-range deformability and a nearly perfect elastic recovery...
2016: Beilstein Journal of Nanotechnology
https://www.readbyqxmd.com/read/27809475/elastomeric-light-emitting-polymer-enhanced-by-interpenetrating-networks
#9
Huier Gao, Si Chen, Jiajie Liang, Qibing Pei
Conjugated polymers containing long-chain alkyl side groups for solubility are generally unstretchable: large strain induces crack formation, fracture, or plastic deformation. When the polymers are stretched to re-orient the conjugated chains along the stretching direction high dichroic ratio is observed both for absorption of the ground state and radiative decay of the excited state. Here an interpenetrating polymer network (IPN) approach is reported to impart elastomeric deformability to a conjugated polymer...
November 4, 2016: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/27805605/determination-of-zeta-potential-via-nanoparticle-translocation-velocities-through-a-tunable-nanopore-using-dna-modified-particles-as-an-example
#10
Emma L C J Blundell, Robert Vogel, Mark Platt
Nanopore technologies, known collectively as Resistive Pulse Sensors (RPS), are being used to detect, quantify and characterize proteins, molecules and nanoparticles. Tunable resistive pulse sensing (TRPS) is a relatively recent adaptation to RPS that incorporates a tunable pore that can be altered in real time. Here, we use TRPS to monitor the translocation times of DNA-modified nanoparticles as they traverse the tunable pore membrane as a function of DNA concentration and structure (i.e., single-stranded to double-stranded DNA)...
October 26, 2016: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/27792443/optimising-patient-safety-when-using-elastomeric-pumps-to-administer-outpatient-parenteral-antibiotic-therapy
#11
Gemma Oliver
Outpatient parenteral antibiotic therapy (OPAT) is a growing area of practice that has numerous benefits for both patients and the healthcare system. In order for OPAT services to be successful, strategies need to be in place to maximise efficiency while providing safe, high-quality care. The use of elastomeric pumps to deliver intravenous (IV) antibiotics can have many benefits for OPAT services; they are cost-effective, easy to use and allow the patient to be fully ambulant. However, plans need to be put in place to make sure their use is safe and effective...
October 27, 2016: British Journal of Nursing: BJN
https://www.readbyqxmd.com/read/27783431/an-all-organic-elastomeric-electret-composite
#12
Yee Song Ko, Frank A Nüesch, Dragan Damjanovic, Dorina M Opris
Copolymer nanoparticles with a highly polar repeating unit are blended in an elastic matrix and poled at elevated temperatures. The composite exhibits piezoelectricity due to the overall polarization imparted by the particles, which can be easily modulated thanks to the soft matrix.
October 26, 2016: Advanced Materials
https://www.readbyqxmd.com/read/27782374/effect-of-disinfection-and-sterilization-on-the-tensile-strength-surface-roughness-and-wettability-of-elastomers
#13
Sunil Babu Kotha, Ravikumar Ramakrishnaiah, Darshan Devang Divakar, Sree Lalita Celur, Saad Qasim, Jukka P Matinlinna
AIM: The aim of the present study was to evaluate the effect of chemical disinfection, autoclave, and microwave sterilization on some of the key properties of elastomers. METHODS: Five polyvinylsiloxane elastomeric impression materials were evaluated. Forty samples were fabricated from each material. The samples were randomly selected and assigned to four experimental groups with 50 samples each: group I, control; group II,chemical disinfection; group III, autoclave sterilization; and group IV, microwave sterilization...
October 26, 2016: Journal of Investigative and Clinical Dentistry
https://www.readbyqxmd.com/read/27780764/biodegradable-and-biomimetic-elastomeric-scaffolds-for-tissue-engineered-heart-valves
#14
REVIEW
Yingfei Xue, Vinayak Sant, Julie Phillippi, Shilpa Sant
Valvular heart diseases are the third leading cause of cardiovascular disease, resulting in more than 25,000 deaths annually in the United States. Heart valve tissue engineering (HVTE) has emerged as a putative treatment strategy such that the designed construct would ideally withstand native dynamic mechanical environment, guide regeneration of the diseased tissue and more importantly, have the ability to grow with the patient. These desired functions could be achieved by biomimetic design of tissue-engineered constructs that recapitulate in vivo heart valve microenvironment with biomimetic architecture, optimal mechanical properties and possess suitable biodegradability and biocompatibility...
October 22, 2016: Acta Biomaterialia
https://www.readbyqxmd.com/read/27778466/a-double-chamber-rotating-bioreactor-for-enhanced-tubular-tissue-generation-from-human-mesenchymal-stem-cells
#15
I Stefani, M A Asnaghi, J J Cooper-White, S Mantero
Cardiovascular diseases represent a major global health burden, with high rates of mortality and morbidity. Autologous grafts are commonly used to replace damaged or failing blood vessels, however such approaches are hampered by the scarcity of suitable graft tissue, donor site morbidity and poor long-term stability. Tissue engineering has been investigated as a means by which exogenous vessel grafts can be produced, with varying levels of success to date, a result of mismatched mechanical properties of these vessel substitutes and inadequate ex vivo vessel tissue genesis...
October 24, 2016: Journal of Tissue Engineering and Regenerative Medicine
https://www.readbyqxmd.com/read/27761525/a-simple-check-valve-for-microfluidic-point-of-care-diagnostics
#16
C S Ball, R F Renzi, A Priye, R J Meagher
Check valves are often essential components in microfluidic devices, enabling automated sample processing for diagnostics at the point of care. However, there is an unmet need for a check valve design that is compatible with rigid thermoplastic devices during all stages of development-from initial prototyping with a laser cutter to final production with injection molding. Here, we present simple designs for a passive, normally closed check valve that is manufactured from commonly available materials with a CO2 laser and readily integrated into prototype and production thermoplastic devices...
November 1, 2016: Lab on a Chip
https://www.readbyqxmd.com/read/27749848/tunable-window-device-based-on-micro-wrinkling-of-nanometric-zinc-oxide-thin-film-on-elastomer
#17
Milan Shrestha, Gih-Keong Lau
This Letter presents a tunable window device based on microscopic wrinkling of a transparent elastomeric surface. "Crack-free" microscopic wrinkling of a 50-nm ZnO thin film is possible on a highly adhesive acrylic elastomer membrane (VHB 4910) upon partial release from a large radial pre-stretch of membrane. This ZnO-based tunable window device demonstrates reversible tunability between transparent and translucent states. At zero compression with a flat surface, the device is transparent with a 93% in-line transmittance at 550-nm wavelength...
October 1, 2016: Optics Letters
https://www.readbyqxmd.com/read/27748597/renewable-solid-electrodes-in-microfluidics-recovering-the-electrochemical-activity-without-treating-the-surface
#18
Carlos A Teixeira, Gabriela Furlan Giordano, Maisa B Beltrame, Luis Carlos Silveira Vieira, Angelo Luiz Gobbi, Renato Sousa Lima
The contamination, passivation, or fouling of the detection electrodes is a serious problem undermining the analytical performance of electroanalytical devices. The methods to regenerate the electrochemical activity of the solid electrodes involve mechanical, physical, or chemical surface treatments that usually add operational time, complexity, chemicals, and further instrumental re-quirements to the analysis. In this paper, we describe for the first time a reproducible method for renewing solid electrodes when-ever their morphology or composition are non-specifically changed without any surface treatment...
October 17, 2016: Analytical Chemistry
https://www.readbyqxmd.com/read/27736076/refining-disordered-peptide-ensembles-with-computational-amide-i-spectroscopy-application-to-elastin-like-peptides
#19
Mike Reppert, Anish R Roy, Jeremy O B Tempkin, Aaron R Dinner, Andrei Tokmakoff
The characterization of intrinsically disordered protein (IDP) ensembles is complicated both by inherent heterogeneity and by the fact that many common experimental techniques function poorly when applied to IDPs. For this reason, the development of alternative structural tools for probing IDP ensembles has attracted considerable attention. Here we describe our recent work in developing experimental and computational tools for characterizing IDP ensembles using Amide I (backbone carbonyl stretch) vibrational spectroscopy...
October 13, 2016: Journal of Physical Chemistry. B
https://www.readbyqxmd.com/read/27735061/spallation-of-small-particles-from-peristaltic-pump-tube-segments
#20
Yi Liu, Monica Faria, Edward Leonard
In most extracorporeal filtration devices such as hemodialysis a peristaltic pump is used to circulate blood. Pump function requires the repeated compression of an elastomeric tube from which particles may be shed into the circulatory system, a process called spallation. Earlier studies are likely to have missed the large number of small particles (<2 µm in diameter) that appear. The present study uses more modern equipment that detects and sizes particles down to 0.6 µm. As polyvinyl chloride (PVC) tubing is commonly used for this process, a series of studies was conducted on three different types to study its spallation characteristics, along with a co-extruded PVC/polyurethane tubing known for its enhanced biocompatibility properties...
October 13, 2016: Artificial Organs
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