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https://www.readbyqxmd.com/read/29334577/consequences-of-the-f-d-a-directed-moratorium-on-silicone-gel-breast-implants-1992-2006
#1
Norman M Cole
The FDA silicone gel breast implant moratorium occurred 25 years ago. The immediate and long-term consequences of the moratorium are reviewed and assessed.
January 10, 2018: Plastic and Reconstructive Surgery
https://www.readbyqxmd.com/read/29334386/organic-inorganic-hybrids-having-a-talc-like-structure-as-suitable-hosts-to-guest-a-wide-range-of-species
#2
J Brendlé
The sol-gel process involving hydrolysis and condensation reactions is an attractive way to form siloxane based hybrid materials since it is a one-step method performed under mild conditions. Organic-inorganic hybrids having a talc-like structure (TLH) can be obtained using this procedure starting from organotrialkoxysilanes having the formula R-Si(OR')3 (where R stands for an organic moiety and R' for a methyl or ethyl group) with different functionalities, an aqueous or ethanolic solution of a magnesium salt, and in some cases, an aqueous solution of sodium hydroxide...
January 15, 2018: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/29334362/investigation-of-resistance-switching-in-siox-rram-cells-using-a-3d-multi-scale-kinetic-monte-carlo-simulator
#3
Toufik Sadi, Adnan Mehonic, Luca Montesi, Mark Buckwell, Anthony Kenyon, Asen Asenov
We employ an advanced three-dimensional (3D) electro-thermal simulator to explore the physics and potential of oxide-based resistive random-access memory (RRAM) cells. The physical simulation model has been developed recently, and couples a kinetic Monte Carlo study of electron and ionic transport to the self-heating phenomenon while accounting carefully for the physics of vacancy generation and recombination, and trapping mechanisms. The simulation framework successfully captures resistance switching, including the electroforming, set and reset processes, by modeling the dynamics of conductive filaments in the 3D space...
January 15, 2018: Journal of Physics. Condensed Matter: An Institute of Physics Journal
https://www.readbyqxmd.com/read/29334098/how-a-tertiary-diamine-molecule-chelates-the-silicon-dimers-of-the-si-001-surface-a-real-time-scanning-tunneling-microscopy-study
#4
Ahmed Naitabdi, François Rochet, Fabrice Bournel, Marco Bonato, Jean-Jacques Gallet, Federica Bondino, Elena Magnano
The patterning of silicon surfaces by organic molecules emerges as an original way to fabricate innovative nanoelectronic devices. In this regard, we have studied how a diamine, N,N,N',N'-tetramethylethylenediamine (TMEDA, (CH3)2N-[CH2]2-N(CH3)2), chelates the silicon dimers of the Si(001)-2 × 1 surface. Starting from very low coverage to surface saturation (at 300 K), we used real-time scanning tunneling microscopy (STM) in a scanning-while-dosing approach. The images show that the molecules can adopt two bonding configurations: the cross-trench (CT) configuration by bridging two adjacent dimer rows, and the end-bridge (EB) configuration by chelating two adjacent dimers in the same row...
January 15, 2018: Nanoscale
https://www.readbyqxmd.com/read/29334079/first-heating-measurements-of-endovascular-stents-in-magnetic-particle-imaging
#5
Franz Wegner, Thomas Friedrich, Nikolaos Panagiotopoulos, Sarah Vaalma, Jan Peter Goltz, Florian M Vogt, Martin A Koch, Thorsten M Buzug, Joerg Barkhausen, Julian Haegele
Magnetic Particle Imaging (MPI) is a three-dimensional imaging method which visualizes the spatial distribution of Superparamagnetic Iron Oxide Nanoparticles (SPIOs) with oscillating and static magnetic fields. It is a quantitative method as the intensity of its signal is proportional to the concentration of the SPIOs. Due to its quantitativeness, high temporal resolution and kidney-safe tracers it is proposed to be a very promising noninvasive method for cardiovascular imaging. In this regard MPI in the presence of endovascular stents and assessment of stent patency with MPI has to be evaluated...
January 15, 2018: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/29333853/a-highly-sensitive-and-very-stretchable-strain-sensor-based-on-a-rubbery-semiconductor
#6
Hae-Jin Kim, Anish Thukral, Cunjiang Yu
There is a growing interest in developing stretchable strain sensors to quantify the large mechanical deformation and strain associated with the activities for a wide range of species, such as humans, machines, and robots. Here, we report a novel stretchable strain sensor entirely in a rubber format by using a solution processed rubbery semiconductor as the sensing material to achieve high sensitivity, large mechanical strain tolerance, hysteresis-less and highly linear responses. Specifically, the rubbery semiconductor exploits π-π stacked poly(3-hexylthiophene-2,5-diyl) nanofibrils (P3HT-NFs) percolated in silicone elastomer of polydimethylsiloxane (PDMS) to yield semiconducting nanocomposite with a large mechanical stretchability, although P3HT is a well-known nonstretchable semiconductor...
January 15, 2018: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29333837/-biodegradable-airway-stent-for-the-treatment-of-bronchial-obstruction-in-the-child-case-report
#7
Giselle Cuestas, Verónica Rodríguez, Flavia Doormann, Patricio Bellia Munzón, Gastón Bellia Munzón
Bronchial obstruction is infrequent in the child. The main cause is malacia or benign stenosis. Management alternatives range from conservative treatment to complex surgical and/or endoscopic techniques. Placement of a stent can play a key role in situations where there is no other therapeutic option. However, the ideal stent is not yet available. In the last few years, progress has been made in the development and characterization of novel biodegradable materials in order to overcome the drawbacks of traditional stents made of silicone or metal...
February 1, 2018: Archivos Argentinos de Pediatría
https://www.readbyqxmd.com/read/29333693/polypeptide-polymer-brushes-by-light-induced-surface-polymerization-of-amino-acid-n-carboxyanhydrides
#8
Timo Stukenkemper, Xavier Paquez, M W G M Verhoeven, Emiel J M Hensen, Aylvin A Dias, Dermot F Brougham, Andreas Heise
Silicon wafers are decorated with photoamine generator 4,5-dimethoxy-2-nitrobenzyl 3-(triethoxysilyl)propyl carbamate. UV-irradiation in the presence of benzyl-l-glutamate N-carboxyanhydride is carried out, resulting in the release of the surface-bound primary amines, making them viable N-carboxyanhydride (NCA) polymerization initiators. Successful polypeptide grafting is confirmed by water contact angle measurements as well as by ellipsometry, revealing a poly(benzyl-l-glutamate) (PBLG) layer of ≈3 nm. X-ray photoelectron spectroscopy confirms the presence of amide groups in the grafted PBLG while time-of-flight secondary ion mass spectroscopy provides additional evidence for the presence of PBLG on the surface...
January 15, 2018: Macromolecular Rapid Communications
https://www.readbyqxmd.com/read/29333339/time-multiplexed-deep-reactive-ion-etching-of-germanium-and-silicon-a-comparison-of-mechanisms-and-application-to-x-ray-optics
#9
Vincent J Genova, David N Agyeman-Budu, Arthur R Woll
Although the mechanisms of deep reactive ion etching (DRIE) of silicon have been reported extensively, very little by comparison has been discussed concerning DRIE of germanium. By directly comparing silicon and germanium etching in a time multiplexed DRIE process, the authors extract significant differences in etch mechanisms from a design of experiment and discuss how these differences are relevant to the design and fabrication of silicon and germanium collimating channel array x-ray optics. The differences are illuminated by characteristics such as reactive ion etching (RIE)-lag, aspect ratio dependent etching, and sidewall passivation...
January 2018: Journal of Vacuum Science and Technology. B, Nanotechnology & Microelectronics: Materials, Processing, Measurement, & Phenomena: JVST B
https://www.readbyqxmd.com/read/29332203/custom-made-antibiotic-loaded-acrylic-cement-spacers-using-a-dental-silicone-template-for-treatment-of-infected-hip-prostheses
#10
Tadahiko Ohtsuru, Yuji Morita, Yasuaki Murata, Yutaro Munakata, Masafumi Itoh, Yoshiharu Kato, Ken Okazaki
PURPOSE: Antibiotic-loaded acrylic cement (ALAC) spacers are useful for treatment of infected prostheses in the course of a two-stage revision. Spacers are handmade or are made using a commercial template, with reportedly good treatment outcomes. This study aimed to confirm the usefulness of custom-made ALAC spacers shaped like bipolar hip prostheses using a dental silicone template for treatment of infected hip prostheses, and described their manufacture. METHODS: This study evaluated 10 patients who underwent two-stage revision for treatment of infected hip prostheses...
January 13, 2018: European Journal of Orthopaedic Surgery & Traumatology: Orthopédie Traumatologie
https://www.readbyqxmd.com/read/29332116/applying-preventive-measures-leading-to-significant-reduction-of-catheter-associated-urinary-tract-infections-in-adult-intensive-care-unit
#11
Fahad M Al-Hameed, Gulam R Ahmed, Asim A AlSaedi, Muhammad J Bhutta, Faisal F Al-Hameed, Majid M AlShamrani
To determine the impact of applying the best available clinical evidence on the preventive measures to reduce the rate of catheter-associated urinary tract infections (CAUTI) in adult intensive care units (ICU).     Methods:  Data were collected from adult ICUs (28 beds) from 2008 to 2016. The proper use of silicon catheter, aseptic insertion technique, emptying bag three-fourth via close circuit, the use of appropriate size catheter, securing the draining tube on the thigh to keep catheter bag below patient's bladder level and removal of the catheter as early as possible were ensured in all patients...
January 2018: Saudi Medical Journal
https://www.readbyqxmd.com/read/29332104/assessment-of-the-fit-of-removable-partial-denture-fabricated-by-computer-aided-designing-computer-aided-manufacturing-technology
#12
Khalid A O Arafa
To assess the level of evidence that supports the quality of fit for removable partial denture (RPD) fabricated by computer-aided designing/computer aided manufacturing (CAD/CAM) and rapid prototyping (RP) technology. Methods: An electronic search was performed in Google Scholar, PubMed, and Cochrane library search engines, using Boolean operators. All articles published in English and published in the period from 1950 until April 2017 were eligible to be included in this review. The total number of articles contained the search terms in any part of the article (including titles, abstracts, or article texts) were screened, which resulted in 214 articles...
January 2018: Saudi Medical Journal
https://www.readbyqxmd.com/read/29331724/diminution-of-arsenic-accumulation-in-rice-seedlings-co-cultured-with-anabaena-sp-modulation-in-the-expression-of-lower-silicon-transporters-two-nitrogen-dependent-genes-and-lowering-of-antioxidants-activity
#13
Ruma Ranjan, Navin Kumar, Arvind Kumar Dubey, Ambedkar Gautam, Shyam Narain Pandey, Shekhar Mallick
The present study was intended to investigate the role of algae, Anabaena sp. in the amelioration of As toxicity, when co-cultured with rice seedlings. The reduction of growth in rice seedlings against As(III) and As(V) was recovered with Anabaena sp. The Anabaena sp. also reduced the accumulation of As, where it was more efficient against 60µM As(III) (49%) than As(V) (23%) in rice shoot. Similarly, with reduction of As accumulation, lower silicon transporters (Lsi-1 and Lsi-2) was found to be suppressed against As treatments...
January 10, 2018: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/29331438/characterization-of-surface-properties-of-glass-vials-used-as-primary-packaging-material-for-parenterals
#14
Dominique Ditter, Hanns-Christian Mahler, Holger Roehl, Michael Wahl, Joerg Huwyler, Alejandra Nieto, Andrea Allmendinger
The appropriate selection of adequate primary packaging, such as the glass vial, rubber stopper, and crimp cap for parenteral products is of high importance to ensure product stability, microbiological quality (integrity) during storage as well as patient safety. A number of issues can arise when inadequate vial material is chosen, and sole compliance to hydrolytic class I is sometimes not sufficient when choosing a glass vial. Using an appropriate pre-treatment, such as surface modification or coating of the inner vial surface after the vial forming process the glass container quality is often improved and interactions of the formulation with the surface of glass may be minimized...
January 10, 2018: European Journal of Pharmaceutics and Biopharmaceutics
https://www.readbyqxmd.com/read/29330582/nano-silicon-alters-antioxidant-activities-of-soybean-seedlings-under-salt-toxicity
#15
Salar Farhangi-Abriz, Shahram Torabian
Materials with a particle size less than 100 nm are classified as nano-materials. The physical and chemical properties of nano-materials can vary considerably from those of bulk materials of the same composition. Silicon (Si) still fails to get recognized as an essential nutrient for plant growth and development, however the beneficial effects in terms of growth, biotic and abiotic stress resistance have been indicated in a variety of plant species for their growth. The aim of this study was to investigate the effects of different nano-silicon rates on the growth and antioxidant activities of soybean (Glycine max L...
January 12, 2018: Protoplasma
https://www.readbyqxmd.com/read/29329886/solid-phase-extraction-of-chlorophenols-in-seawater-using-a-magnetic-ionic-liquid-molecularly-imprinted-polymer-with-incorporated-silicon-dioxide-as-a-sorbent
#16
Wanwan Ma, Kyung Ho Row
A type of magnetic ionic liquid based molecularly imprinted polymer coated on SiO2 (Fe3O4@SiO2@IL-MIPs) was prepared with 1-vinyl-3-ethylimidazole ionic liquid as functional monomer, and 1,4-butane-3,3'-bis-1-ethylimidazole ionic liquid as cross linker, 4-Chlorophenol as template was successfully applied as a selective adsorbent for selective extraction of 5 chlorophenols in seawater samples by using the magnetic solid-phase extraction (MSPE) method. 11 types of Fe3O4@SiO2@IL-MIPs were synthesized and investigated for their different compositions of functional monomer (such as [C2min][Br], [C2min][BF4], [C2min][PF6], acrylamide, methacrylic acid and 4-vinyl pyridine) and cross-linker (such as [C4min2][Br], [C4min2][BF4], [C4min2][PF6], divinylbenzene, and ethylene glycol dimethacrylate), respectively...
January 6, 2018: Journal of Chromatography. A
https://www.readbyqxmd.com/read/29328725/realization-of-a-hole-doped-mott-insulator-on-a-triangular-silicon-lattice
#17
Fangfei Ming, Steve Johnston, Daniel Mulugeta, Tyler S Smith, Paolo Vilmercati, Geunseop Lee, Thomas A Maier, Paul C Snijders, Hanno H Weitering
The physics of doped Mott insulators is at the heart of some of the most exotic physical phenomena in materials research including insulator-metal transitions, colossal magnetoresistance, and high-temperature superconductivity in layered perovskite compounds. Advances in this field would greatly benefit from the availability of new material systems with a similar richness of physical phenomena but with fewer chemical and structural complications in comparison to oxides. Using scanning tunneling microscopy and spectroscopy, we show that such a system can be realized on a silicon platform...
December 29, 2017: Physical Review Letters
https://www.readbyqxmd.com/read/29328623/mimicking-biological-synaptic-functionality-with-an-indium-phosphide-synaptic-device-on-silicon-for-scalable-neuromorphic-computing
#18
Debarghya Sarkar, Jun Tao, Wei Wang, Qingfeng Lin, Matthew Yeung, Chenhao Ren, Rehan Kapadia
Neuromorphic or "brain-like" computation is a leading candidate for efficient, fault-tolerant processing of large-scale data, as well as real-time sensing and transduction of complex multivariate systems and networks such as self-driving vehicles or Internet of Things applications. In biology, the synapse serves as an active memory unit in the neural system, and is the component responsible for learning and memory. Electronically emulating this element via a compact, scalable technology which can be integrated in a 3-D architecture is critical for future implementations of neuromorphic processors...
January 12, 2018: ACS Nano
https://www.readbyqxmd.com/read/29328333/broadband-tunable-filter-based-on-the-loop-of-multimode-bragg-grating
#19
Jianfei Jiang, Huiye Qiu, Gencheng Wang, Yan Li, Tingge Dai, Xiaofei Wang, Hui Yu, Jianyi Yang, Xiaoqing Jiang
A broadband tunable silicon filter has been demonstrated on silicon-on-insulator platform. The device is based on the loop of multimode anti-symmetric waveguide Bragg grating. A wide bandwidth tunability about 1.455 THz (0.117-1.572 THz) is achieved. The device, functions like a ring, can realize the bandwidth tunable of the drop port and the through port. And, its feature has simultaneous wavelength tuning and no free space ranges limitation. A high out-of-band contrast of 30 dB is achieved with a bandwidth of 1...
January 8, 2018: Optics Express
https://www.readbyqxmd.com/read/29328305/analysis-of-photonic-noise-generated-due-to-kerr-nonlinearity-in-silicon-ring-resonators
#20
Tomer Yeminy, Dan Sadot, Zeev Zalevsky
The Kerr effect in silicon ring resonators (RRs) is widely used for switching and regeneration of optical communications signals. In addition, it has been shown to considerably limit the performance of refractive index sensors based on high quality-factor RRs. While the Kerr effect's impact on output signals of silicon RRs is well known, its influence on the properties of the output noise is yet to be explored. In this work, we analytically and numerically analyze the noise properties of Kerr effect in silicon RRs...
January 8, 2018: Optics Express
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