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https://www.readbyqxmd.com/read/28738638/mixed-matrix-membranes-incorporated-with-ln-mof-for-selective-and-sensitive-detection-of-nitrofuran-antibiotics-based-on-inner-filter-effect
#1
Feng Zhang, Hua Yao, Yifan Zhao, Xing Li, Gaowei Zhang, Yangyi Yang
The detection of antibiotics is critical and challenging due to the pervasive use of antibiotics had inevitably brought some negative impacts on ecosystem and human health. Herein, we reported an anti-interfere ability enhanced luminescent sensor of lanthanide metal-organic framework (Ln-MOF) filled mixed matrix membranes (MMMs), which combining the processibility of poly(methyl methacrylate) (PMMA) polymer with Ln-MOF of {[Tb2(AIP)2(H2O)10]·(AIP)·4H2O}n (Tb-AIP, where AIP is 5-aminoisophthalate) fillers...
November 1, 2017: Talanta
https://www.readbyqxmd.com/read/28737011/a-distinctive-patchy-osteomalacia-characterises-phospho1-deficient-mice
#2
Alan Boyde, Katherine A Staines, Behzad Javaheri, Jose Luis Millan, Andrew A Pitsillides, Colin Farquharson
The phosphatase PHOSPHO1 is involved in the initiation of biomineralisation. Bones in Phospho1 knockout (KO) mice show histological osteomalacia with frequent bowing of long bones and spontaneous fractures: they contain less mineral, with smaller mineral crystals. However, the consequences of Phospho1 ablation on the microscale structure of bone are not yet fully elucidated. Tibias and femurs obtained from wild-type and Phospho1 null (KO) mice (25-32 weeks old) were embedded in PMMA, cut and polished to produce near longitudinal sections...
August 2017: Journal of Anatomy
https://www.readbyqxmd.com/read/28736355/c2-bone-erosion-secondary-to-iatrogenic-pseudomeningocele-a-case-report-and-description-of-a-novel-surgical-technique
#3
Stephan N Salzmann, Lukas P Lampe, Brian Fernholz, Roger Härtl, Athos Patsalides, Alexander P Hughes
BACKGROUND: Pseudomeningoceles are a rare cause of bone erosions. Development of such erosions in the C2 vertebral body and the odontoid process can lead to life-threatening instability. Treatment options to regain stability include atlantoaxial and occipitocervical fusion. For patients with a history of Chiari decompression and large C2 lesions, common fusion techniques are not always feasible. Additionally fusion surgery sacrifices physiologic motion and is therefore a disabling procedure, especially for young and active patients...
July 20, 2017: World Neurosurgery
https://www.readbyqxmd.com/read/28735526/the-biocompatibility-of-bone-cements-progress-in-methodological-approach
#4
Carlo Dall'Oca, Tommaso Maluta, Gian Mario Micheloni, Matteo Cengarle, Giampaolo Morbioli, Paolo Bernardi, Andrea Sbarbati, Daniele Degl'Innocenti, Franco Lavini, Bruno Magnan
The ideal bone graft substitute should have certain properties and there are many studies dealing with mixture of polymethylmetacrilate (PMMA) and β-tricalciumphospate (β-TCP) presenting the best characteristics of both. Scanning Electron Microscopy (SEM), for ultra-structural data, resulted a very reliable in vivo model to better understand the bioactivity of a cement and to properly evaluate its suitability for a particular purpose. The present study aims to further improve the knowledge on osteointegration development, using both parameters obtained with the Environmental Scanning Electron Microscopy (ESEM) and focused histological examination...
May 4, 2017: European Journal of Histochemistry: EJH
https://www.readbyqxmd.com/read/28734352/real-time-observation-of-perturbation-of-a-drosophila-embryo-s-early-cleavage-cycles-with-microfluidics
#5
Zeqing Bai, Hongcun Bao, Yingying Yuan, Xiaohang Yang, Yongmei Xi, Min Wang
It is of great importance to understand biochemical system's behavior toward environmental perturbation during the development of living organisms. Here a microfluidic platform for Drosophila embryo's online development and observation is presented. The system is capable of developing the embryo's anterior and posterior halves controlled at different temperature environments, and it can be easily coupled with a confocal microscope for real-time image acquisition. The microfluidic chip is consisted of a polymethylmethacrylate (PMMA) substrate with a thickness of 4...
August 22, 2017: Analytica Chimica Acta
https://www.readbyqxmd.com/read/28734259/polishability-and-wear-resistance-of-splint-material-for-oral-appliances-produced-with-conventional-subtractive-and-additive-manufacturing
#6
Fabian Huettig, Achim Kustermann, Ebru Kuscu, Jürgen Geis-Gerstorfer, Sebastian Spintzyk
Occlusal splints to treat bruxism are commonly made from polymethylmethacrylate (PMMA) in a manual workflow (powder-liquid technique). Today digitalization allows a machine-based manufacturing in subtractive (milling) and additive (printing) means using industrial-made PMMA or comparable resins. An in-vitro study should assess the surface finish and screen the wear resistance of conventional and industrial materials. Therefore, a total of 30 specimens made from conventionally PMMA (group C; powder-liquid, Palapress), polycarbonate ingots (group S; innoBlanc splint plus), and light-curing resin (group A; VarseoWax splint) were polished to examine the surface roughness (Ra) by profilometry and further analyzed by SEM...
July 14, 2017: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/28733004/study-on-thermal-mechanical-and-adsorption-properties-of-amine-functionalized-mcm-41-pmma-and-mcm-41-ps-nanocomposites-prepared-by-ultrasonic-irradiation
#7
Gholamhossein Mohammadnezhad, Saeed Abad, Roozbeh Soltani, Mohammad Dinari
In this study, two common industrial polymers, poly(methyl methacrylate) (PMMA) and polystyrene (PS), were incorporated into amine-functionalized MCM-41 mesoporous silica as reinforcement agents via an ultrasonic assisted method as a facile, fast, eco-friendly, and versatile synthetic tool. Amino functionalization of MCM-41 were performed by 3-aminopropyl triethoxysilane as a coupling agent and it is denoted as APTS-MCM-41. The obtained nanocomposites (NCs), APTS-MCM-41/PMMA and APTS-MCM-41/PS, were characterized by Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), scanning and transmission electron microscopies (SEM and TEM), and thermogravimetric analysis (TGA)...
November 2017: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/28730212/suspension-based-imprint-lithography-of-zno-pmma-hybrids
#8
Michelle Gervasio, Kathy Lu
Imprint lithography has been explored as a method to transfer arrays of patterned features onto pure polymers and polymer/metallic nanoparticle composites. Despite the success of this method for those materials, it has never been achieved on the sub-micron scale with polymer-oxide particle hybrids. This study patterns ZnO-PMMA (poly(methyl methacrylate)) hybrids via imprint lithography from co-suspensions of PMMA and ZnO nanoparticles in anisole from 1 vol% to 20 vol% ZnO solids loading. ZnO nanoparticles are functionalized with nonanoic acid to disperse the nanoparticles in anisole with dissolved PMMA...
July 21, 2017: Soft Matter
https://www.readbyqxmd.com/read/28730193/using-anion-recognition-to-control-the-folding-and-unfolding-of-a-single-chain-phosphorescent-polymer
#9
Xiaofan Ji, Chenxing Guo, Xian-Sheng Ke, Xiaodong Chi, Jonathan L Sessler
We report here the use of anion recognition to control the folding and unfolding of a single polymeric chain consisting of a PMMA bearing pendant calix[4]pyrrole and Pt(ii) porphyrin subunits.
July 21, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28729905/an69st-membranes-adsorb-nafamostat-mesylate-and-affect-the-management-of-anticoagulant-therapy-a-retrospective-study
#10
Takahiro Hirayama, Nobuyuki Nosaka, Yasumasa Okawa, Soichiro Ushio, Yoshihisa Kitamura, Toshiaki Sendo, Toyomu Ugawa, Atsunori Nakao
BACKGROUND: In Japan, nafamostat mesylate (NM) is frequently used as an anticoagulant during continuous renal replacement therapy (CRRT). The dialyzer membrane AN69ST has been reported to adsorb NM and affect the management of anticoagulant therapy. However, the adsorbed amount has not yet been quantitatively assessed. Therefore, in this study, we evaluated the pre- and post-hemofilter prolongation of the activated clotting time (ACT) in patients with AN69ST and PS membranes. We also measured the adsorption of NM in three types of CRRT membranes using an experimental model...
2017: Journal of Intensive Care
https://www.readbyqxmd.com/read/28729521/influence-of-block-copolymer-feature-size-on-reactive-ion-etching-pattern-transfer-into-silicon
#11
Masoud Dialameh, Federico Ferrarese Lupi, Dario Imbraguglio, Fabio Zanenga, Alessio Lamperti, Davide Martella, Gabriele Seguini, Michele Perego, Andrea Mario Rossi, Natascia De Leo, Luca Boarino
A successful realization of sub 20 nm features on silicon is becoming the focus of many technological studies, strongly influencing the future performance of modern integrated circuits. Although reactive ion etching (RIE), at both micrometric and nanometric scale has already been the target of many studies, a better understanding of the different mechanisms involved at sub 20 nm size etching is still required. In this work, we investigated the influence of the feature size on etch rate of silicon, performed by Cryogenic RIE process through cylinder-forming polystyrene-block-polymethilmetacrhlate (PS-b-PMMA) DiBlock Copolymers (DBCs) masks with diameter ranging between 19 and 13 nm...
July 21, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28727435/wettability-effect-on-evaporation-dynamics-and-crystalline-patterns-of-sessile-saline-droplets
#12
Xin Zhong, Junheng Ren, Fei Duan
The evaporative dynamics and crystalline patterns from sessile saline droplets on various substrates are experimentally investigated. On the silicon wafer and polymethyl methacrylate (PMMA) plate, the saline droplets exhibit unique evaporative dynamics such that the contact angle keeps increasing for a lasting period. Such an enlargement in contact angle is attenuated at a higher salt concentration. Interestingly, the onset of precipitation is almost overlapped with the end of contact angle enlargement when the contact angle reaches its apex...
July 20, 2017: Journal of Physical Chemistry. B
https://www.readbyqxmd.com/read/28711304/comparing-reach-chemical-safety-assessment-information-with-practice-a-case-study-of-polymethylmethacrylate-pmma-in-floor-coating-in-the-netherlands
#13
Ton Spee, Daan Huizer
On June 1st, 2007 the European regulation on Registration, Evaluation and Restriction of Chemical substances (REACH) came into force. Aim of the regulation is safe use of chemicals for humans and for the environment. The core element of REACH is chemical safety assessment of chemicals and communication of health and safety hazards and risk management measures throughout the supply chain. Extended Safety Data Sheets (Ext-SDS) are the primary carriers of health and safety information. The aim of our project was to find out whether the actual exposure to methyl methacrylate (MMA) during the application of polymethylmethacrylate (PMMA) in floor coatings as assessed in the chemical safety assessment, reflect the exposure situations as observed in the Dutch building practice...
June 4, 2017: International Journal of Hygiene and Environmental Health
https://www.readbyqxmd.com/read/28711015/hydrophilic-surface-modification-of-poly-methyl-methacrylate-based-ocular-prostheses-using-poly-ethylene-glycol-grafting
#14
JaeSang Ko, Kanghee Cho, Sang Won Han, Hyung Kyung Sung, Seung Woon Baek, Won-Gun Koh, Jin Sook Yoon
Ocular prostheses are custom-made polymeric inserts that can be placed in anophthalmic sockets for cosmetic rehabilitation. Prosthetic eye wearers have reduced tear amount, and they often experience dry eye symptoms including dryness, irritation, discomfort, and discharge. Most modern ocular prostheses are made of poly(methyl methacrylate) (PMMA), which is highly hydrophobic. Previous research has shown that improving the wettability of contact lens materials decreases its wearers discomfort by increasing lubrication...
July 8, 2017: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/28709679/the-all-on-4-modified-polyetheretherketone-treatment-approach-a-clinical-report
#15
Panagiotis Zoidis
A modified polyetheretherketone (PEEK) implant framework material in combination with prefabricated high-impact poly(methyl methacrylate) (PMMA) veneers was used as an alternative material for the fabrication of a complete maxillary arch implant-supported fixed restoration. The elastic performance of the PEEK framework (elastic modulus of 4 GPa) combined with PMMA veneers may reduce the occlusal forces, protecting the implant-supported restoration and the opposing dentition, especially in all-on-4 treatments, where lack of proprioception and wide interimplant distance are present...
July 11, 2017: Journal of Prosthetic Dentistry
https://www.readbyqxmd.com/read/28708171/bragg-grating-inscription-in-pmma-optical-fibers-using-400-nm-femtosecond-pulses
#16
Xuehao Hu, Damien Kinet, Karima Chah, Chi-Fung Jeff Pun, Hwa-Yaw Tam, Christophe Caucheteur
In this Letter, we report the fast growth of high quality uniform Bragg gratings in trans-4-stilbenemethanol (TS)-doped poly(methyl methacrylate) (PMMA) step-index optical fibers. Grating manufacturing was obtained using a 400 nm femtosecond pulsed laser and a 1060-nm-period uniform phase mask. For 20 mW mean laser beam power, the grating reflectivity reaches 98% in ∼60  s.
July 15, 2017: Optics Letters
https://www.readbyqxmd.com/read/28707211/high-accuracy-drilling-with-an-image-guided-light-weight-robot-autonomous-versus-intuitive-feed-control
#17
Sebastian Tauscher, Alexander Fuchs, Fabian Baier, Lüder A Kahrs, Tobias Ortmaier
PURPOSE: Assistance of robotic systems in the operating room promises higher accuracy and, hence, demanding surgical interventions become realisable (e.g. the direct cochlear access). Additionally, an intuitive user interface is crucial for the use of robots in surgery. Torque sensors in the joints can be employed for intuitive interaction concepts. Regarding the accuracy, they lead to a lower structural stiffness and, thus, to an additional error source. The aim of this contribution is to examine, if an accuracy needed for demanding interventions can be achieved by such a system or not...
July 13, 2017: International Journal of Computer Assisted Radiology and Surgery
https://www.readbyqxmd.com/read/28706352/monte-carlo-calculation-of-beam-quality-and-phantom-scatter-corrections-for-lithium-formate-electron-paramagnetic-resonance-dosimeter-for-high-energy-brachytherapy-dosimetry
#18
Subhalaxmi Mishra, T Palani Selvam
PURPOSE: To investigate beam quality correction, KQQ0 (r) and phantom scatter correction, Kphan (r) for lithium formate dosimeter as a function of distance r along the transverse axis of the high-energy brachytherapy sources (60)Co, (137)Cs, (192)Ir and (169)Yb using the Monte Carlo-based EGSnrc code system. MATERIALS AND METHODS: The brachytherapy sources investigated in this study are BEBIG High Dose Rate (HDR) (60)Co (model Co0.A86), (137)Cs (model RTR), HDR (192)Ir (model Microselectron) and HDR (169)Yb (model 4140)...
April 2017: Journal of Medical Physics
https://www.readbyqxmd.com/read/28703226/a-paper-polymer-hybrid-cd-like-microfluidic-spinchip-integrated-with-dna-functionalized-graphene-oxide-nanosensors-for-multiplex-qlamp-detection
#19
Maowei Dou, Sharma T Sanjay, Delfina C Dominguez, Sihui Zhan, XiuJun Li
A paper/poly(methyl methacrylate) (PMMA) hybrid CD-like microfluidic SpinChip integrated with DNA probe-functionalized graphene oxide (GO) nanosensors was developed for multiplex quantitative LAMP detection (mqLAMP). This approach can simply and effectively address a major challenging problem of multiplexing in current LAMP methods.
July 13, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28702673/unexpected-thermal-annealing-effects-on-the-viscosity-of-polymer-nanocomposites
#20
Fei Chen, Koshu Takatsuji, Dan Zhao, Xuanji Yu, Sanat K Kumar, Ophelia K C Tsui
The effects of thermal annealing, 12-50 K above the glass transition temperature, on the zero-shear viscosity, η, of polymer nanocomposites (PNCs) and the corresponding host polymers were studied. For all specimens, including neat and 4 wt% dioctyl phthalate (DOP)-plasticized polystyrene (PS), neat poly(methyl methacrylate) (PMMA), and PNCs containing bare and grafted silica nanoparticles in neat and DOP-plasticized PS, the η increased with time initially, and only asymptotically approached a steady-state value after thermal annealing for ∼100 to ∼200 h...
July 12, 2017: Soft Matter
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