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https://www.readbyqxmd.com/read/29454601/cross-linked-polyethylene-does-not-reduce-wear-in-total-knee-arthroplasty
#1
S Lasurt-Bachs, P Torner, F Maculé, E Prats, F Menéndez-García, J Ríos-Guillermo, A Torrents
AIM: To compare two different types of inserts: Ultra-high molecular weight polyethylene (UHMWPE) and cross-linked polyethylene with a quantitative and qualitative study of polyethylene wear particles in synovial fluid 3 years after total knee arthroplasty. MATERIAL AND METHODS: A prospective, randomized, controlled cohort study with blinded evaluation was carried out on 25 patients undergoing staged bilateral total knee replacement, 6 months apart. Knee arthrocentesis was performed on 12 patients 3 years after surgery, and the polyethylene particles were analyzed...
February 14, 2018: Revista Española de Cirugía Ortopédica y Traumatología
https://www.readbyqxmd.com/read/29451358/electronic-structure-characterisation-of-cross-linked-sulfur-polymers
#2
Ute Cappel, Peng Liu, Fredrik Johansson, Bertrand Philippe, Erika Giangrisostomi, Ruslan Ovsyannikov, Andreas Lindblad, Lars Kloo, James Gardner, Håkan Rensmo
Cross-linked polymers of elemental sulfur are of potential interest for electronic applications as they enable facile thin film processing of an abundant and cheap starting material. In this paper, we characterize the electronic structure of a cross-linked sulfur / diisopropenyl benzene (DIB) polymer by a combination of soft and hard X-ray photoelectron spectroscopy. Two different approaches for enhancing the conductivity of the polymer are compared: the addition of selenium in the polymer synthesis and the addition of lithium bis(trifluoromethanesulfonyl)imide (LiTFSI) during film preparation...
February 16, 2018: Chemphyschem: a European Journal of Chemical Physics and Physical Chemistry
https://www.readbyqxmd.com/read/29450805/ph-responsive-cap-co-poly-methacrylic-acid-based-hydrogel-as-an-efficient-platform-for-controlled-gastrointestinal-delivery-fabrication-characterization-in-vitro-and-in-vivo-toxicity-evaluation
#3
Syed Ahmed Shah, Muhammad Sohail, Muhammad Usman Minhas, Nisar-Ur-Rehman, Shahzeb Khan, Zahid Hussain, Mudassir, Arshad Mahmood, Mubeen Kousar, Asif Mahmood
Cellulose acetate phthalate-based pH-responsive hydrogel was synthesized for fabrication of polymeric matrix tablets for gastro-protective delivery of loxoprofen sodium. Cellulose acetate phthalate (CAP) was cross-linked with methacrylic acid (MAA) using free radical polymerization technique. Fourier transform infrared (FTIR) spectra confirmed the formation of cross-linked structure of CAP-co-poly(methacrylic acid). Thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC) confirmed the thermal stability of polymeric networks, and scanning electron microscopy (SEM) and energy-dispersive X-ray spectrum (EDS) images unveiled that the prepared formulations were porous in nature and thus the developed formulations had shown better diffusibility...
February 15, 2018: Drug Delivery and Translational Research
https://www.readbyqxmd.com/read/29445830/bone-health-assessment-in-older-people-with-or-without-muscle-health-impairment
#4
M Locquet, C Beaudart, O Bruyère, J A Kanis, L Delandsheere, J-Y Reginster
This study investigated the relationship between muscle and bone status in elderly individuals. Our results suggested links between sarcopenia and osteoporosis; impairment in muscle status (i.e., muscle mass, muscle strength, and physical performance) is associated with deterioration in bone mass and texture subsequently leading to an increased risk of fracture. INTRODUCTION: Accumulating evidence has shown associations between sarcopenia and osteoporosis, but existing studies face inconsistencies in the clinical definition of both conditions...
February 14, 2018: Osteoporosis International
https://www.readbyqxmd.com/read/29442961/new-green-hydrogels-based-on-lignin
#5
Diana Ciolacu, Georgeta Cazacu
The development of various green materials from lignin, which is most often considered as waste, is of prime interest from environmental and economic points of view. In the last years, only few studies regarding the use of lignin as a backbone component in the hydrogels have been made. The potential efficacy of lignin in hydrogels with particular emphasis on synthesis and characterization was investigated. By using steam explosion lignin from aspen wood or the corresponding epoxy-resin mixed with poly(vinyl alcohol), a series of new green hydrogels were prepared by covalent crosslinking in the presence of the epichlorohydrin...
April 1, 2018: Journal of Nanoscience and Nanotechnology
https://www.readbyqxmd.com/read/29442684/corrosion-protection-properties-and-mechanism-of-epoxy-acetic-acid-doped-polyaniline-coating-on-magnesium-alloy
#6
Tao Jin, Yanmin Wang, Hong Yin, Xiaojuan Hao
Poly(amidoamine)(PAMAM)/epoxy/acetic acid-doped polyaniline (PAni) coatings were successfully prepared and coated on magnesium alloy substrates. X-ray diffraction pattern, Fourier transform infrared spectroscopy, scanning electron microscopy technique were used to characterize the composition and morphology of acetic acid-doped PAni and composite coatings. The effect of the usage amount of doped PAni on the corrosion protection performance was evaluated with electrochemical measurement in 3.5 wt.% NaCl solutions...
July 1, 2018: Journal of Nanoscience and Nanotechnology
https://www.readbyqxmd.com/read/29442681/corrosion-protection-properties-of-nano-nh%C3%A2-reduced-graphene-oxide-epoxy-composite-coatings-formed-by-self-curing-on-magnesium-alloy
#7
Tao Jin, Yongqin Han, Ruiqin Bai, Xin Liu
Nano NH2-reduced graphene oxide (NGO) and NGO/epoxy resin coatings were prepared, respectively. NGO/epoxy coating was successfully coated on magnesium alloy substrates. X-ray diffraction patterns, Fourier transform infrared spectroscopy, Scanning electron microscopy techniques were used to characterize the composition and morphology of NGO and composite coatings. The effect of the content of NGO on the corrosion protection performance of coatings was evaluated with electrochemical measurements in 3.5 wt.% NaCl solutions...
July 1, 2018: Journal of Nanoscience and Nanotechnology
https://www.readbyqxmd.com/read/29442516/engineering-nitroxide-functional-surfaces-using-bioinspired-adhesion
#8
Hendrik Woehlk, Jan Steinkoenig, Christiane Lang, Lukas Michalek, Vanessa Trouillet, Peter Krolla-Sidenstein, Anja S Goldmann, Leonie Barner, James P Blinco, Christopher Barner-Kowollik, Kathryn E Fairfull-Smith
We pioneer a versatile surface modification strategy based on mussel inspired oxidative catecholamine polymerization for the design of nitroxide containing thin polymer films. A 3,4-dihydroxy-L-phenylalanine (L-DOPA) monomer equipped with a 2,2,6,6-tetramethylpiperidine-1-oxyl (TEMPO) derived oxidation-labile hydroxylamine functional group is employed as a universal coating agent to generate polymer scaffolds with persistent radical character. Various types of materials including silicon, titanium, ceramic alumina and inert poly(tetrafluoroethylene) (PTFE) were successfully coated with poly(DOPA-TEMPO) thin films in a one-step dip-coating procedure under aerobic, slightly alkaline (pH 8...
February 14, 2018: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/29435688/cloning-and-expression-of-ferulic-acid-esterase-gene-and-its-effect-on-wort-filterability
#9
Dianhui Wu, Guolin Cai, Xiaomin Li, Bing Li, Jian Lu
OBJECTIVES: To optimize the expression of type A ferulic acid esterase (FaeA) from Aspergillus niger in Pichia pastoris X-33 using codon optimization. RESULTS: Recombinant FaeA was purified from the fermentation broth, with the maximum specific activity of 48.4 ± 0.1 U mg-1. Adding it during mashing process for beer brewing raised the filtration rate by 14.5% while the turbidity and viscosity declined by 22 and 6.9%, respectively. Addition of FaeA increased the concentrations of free ferulic acid (FA) and arabinoxylan (AX) in the wort, while the polymeric arabinoxylans content declined significantly...
February 12, 2018: Biotechnology Letters
https://www.readbyqxmd.com/read/29433823/porphyrin-based-magnetic-nanocomposites-for-efficient-extraction-of-polycyclic-aromatic-hydrocarbons-from-water-samples
#10
Jing Yu, Shukui Zhu, Liling Pang, Pin Chen, Gang-Tian Zhu
Stable and reusable porphyrin-based magnetic nanocomposites were successfully synthesized for efficient extraction of polycyclic aromatic hydrocarbons (PAHs) from environmental water samples. Meso-Tetra (4-carboxyphenyl) porphyrin (TCPP), a kind of porphyrin, can connect the copolymer after amidation and was linked to Fe3O4@SiO2 magnetic nanospheres via cross-coupling. Several characteristic techniques such as field emission scanning electron microscopy, transmission electron microscopy, X-ray diffraction, Fourier transform infrared spectrometry, vibrating sample magnetometry and a tensiometer were used to characterize the as-synthesized materials...
February 7, 2018: Journal of Chromatography. A
https://www.readbyqxmd.com/read/29433315/factors-controlling-drug-release-in-cross-linked-poly-valerolactone-based-matrices
#11
Frantz Le Devedec, Hilary Boucher, David N Dubins, Christine Allen
There is keen interest in the development of biocompatible and biodegradable implantable delivery systems (IDDS) that provide sustained drug release for prolonged periods in humans. These systems have the potential to enhance therapeutic outcomes, reduce systemic toxicity and improve patient compliance. Herein, we report the preparation and physico-chemical characterization of cross-linked polymeric matrices from poly(valerolactone)-co-poly(allyl-δ-valerolactone) (PVL-co-PAVL) copolymers for use in drug delivery...
February 13, 2018: Molecular Pharmaceutics
https://www.readbyqxmd.com/read/29431831/solvent-free-and-biocompatible-multiphased-organic-inorganic-hybrid-nanocomposites
#12
Laura C E da Silva, Luiz G L Germiniani, Tomás S Plivelic, Maria C Gonçalves
Biocompatible chemically cross-linked organic-inorganic (O-I) hybrid nanocomposites were developed using a new atoxic, simple and fast, solvent-free pathway. Poly(ε-caprolactone) (PCL) and poly(ethylene glycol) (PEG), which are both biocompatible, were used as the organic moieties (at different PCL/PEG ratios), while in situ synthesized polysilsesquioxanes made up the inorganic moiety. The O-I hybrid nanocomposites' molecular structures were characterized using solid-state 29Si NMR, TGA and ATR-IR. Results showed an unusually high condensation yield of approximately 90% and two distinct silsesquioxane structures...
February 12, 2018: Soft Matter
https://www.readbyqxmd.com/read/29429669/ultrasonic-irradiation-to-modify-the-functionalized-bionanocomposite-in-sulfonated-polybenzimidazole-membrane-for-fuel-cells-applications-and-antibacterial-activity
#13
Banafshe Esmaeilzade, Sheida Esmaielzadeh, Hashem Ahmadizadegan
In this article the new proton exchange membranes were prepared from sulfonated polybenzimidazole (s-PBI) and various amounts of sulfonated titania/cellulose nanohybrids (titania/cellulose-SO3H) via ultrasonic waves. The ultrasonic irradiation effectively changes the rheology and the glass transition temperature and the crystallinity of the composite polymer. Ultrasonic irradiation has a very strong mixing and dispersion effect, much stronger than conventional stirring, which can improve the dispersion of titania/cellulose-SO3H nanoparticles in the polymer matrix...
April 2018: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/29429225/-development-of-a-novel-absorbable-nanofiber-chitosan-collagen-membrane-by-electrospinning-and-the-preliminary-study-on-guided-bone-regeneration
#14
B Gao, X J Li, M Lin, Y Y Li, Y Dong
Objective: To evaluate the application effect of nanofiber chitosan-collagen membrane (NCM) on guided bone regeneration (GBR). Methods: The mixture of collagen, chitosan, polyethylene oxide was used to make up the NCM by electrospinning, then the NCM was crosslinked by glutaraldehyde vapor. The physical property of the NCM was measured by scanning electron microscopy (SEM) and Fourier transform infrared spectroscopy (FTIR). MC3T3-E1 osteoblasts were cultured on NCM to characterize the biocompatibility. The effectiveness of four groups [contrast group, Bio-gide membrane (BGM), compressed chitosan-collagen menbrane (CCM), NCM/CCM] on bone regeneration were evaluated in critical-sized defects (diameter=5 mm) in SD rats...
February 9, 2018: Zhonghua Kou Qiang Yi Xue za Zhi, Zhonghua Kouqiang Yixue Zazhi, Chinese Journal of Stomatology
https://www.readbyqxmd.com/read/29428468/the-effect-of-levetiracetam-on-rat-bone-mineral-density-bone-structure-and-biochemical-markers-of-bone-metabolism
#15
Iva Karesova, Julius Simko, Sona Fekete, Eva Zimcikova, Jana Malakova, Helena Zivna, Ladislava Pavlikova, Vladimir Palicka
Some data suggest that exposure to levetiracetam (LEV) might be associated with a risk for bone health in the model of orchidectomized rats. The aim of this study was to investigate if there is any significant risk of LEV for bone health in the model of gonadally intact animals. Wistar rats were divided into a control group and a test group, 8 rats in each group. The control rats received standard laboratory diet (SLD) while rats in the test group were fed SLD enriched with LEV for 12 weeks. Dual energy X-ray absorptiometry was used to measure BMD of the whole body, femur and lumbar vertebrae...
February 8, 2018: European Journal of Pharmacology
https://www.readbyqxmd.com/read/29427944/antimicrobial-coatings-on-polyethylene-terephthalate-based-on-curcumin-cyclodextrin-complex-embedded-in-a-multilayer-polyelectrolyte-architecture
#16
Ilya Shlar, Samir Droby, Victor Rodov
Bacterial contamination is a growing concern worldwide. The aim of this work was to develop an antimicrobial coating based on curcumin-cyclodextrin inclusion complex and using polyethylene terephthalate (PET) film as a support matrix. After a pre-treatment aimed to provide sufficient electric charge to the PET surface, it was electrostatically coated with repeated multilayers comprising alternately deposited positively-charged poly-l-lysine (PLL) and negatively-charged poly-l-glutamic acid (PLGA) and carboxymethyl-β-cyclodextrin (CMBCD)...
February 5, 2018: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/29425735/revealing-the-interaction-mode-of-the-highly-flexible-sorghum-bicolor-hsp70-hsp90-organizing-protein-hop-a-conserved-carboxylate-clamp-confers-high-affinity-binding-to-hsp90
#17
Regina Adão, Letícia M Zanphorlin, Tatiani B Lima, Dev Sriranganadane, Käthe M Dahlström, Glaucia M S Pinheiro, Fabio C Gozzo, Leandro R S Barbosa, Carlos H I Ramos
Proteostasis is dependent on the Hsp70/Hsp90 system (the two chaperones and their co-chaperones). Of these, Hop (Hsp70/Hsp90 organizing protein), also known as Sti1, forms an important scaffold to simultaneously binding to both Hsp70 and Hsp90. Hop/Sti1 has been implicated in several disease states, for instance cancer and transmissible spongiform encephalopathies. Therefore, human and yeast homologous have been better studied and information on plant homologous is still limited, even though plants are continuously exposed to environmental stress...
February 6, 2018: Journal of Proteomics
https://www.readbyqxmd.com/read/29417843/microneedles-containing-cross-linked-hyaluronic-acid-particulates-for-control-of-degradation-and-swelling-behavior-after-administration-into-skin
#18
Jun-Tae Choi, Sangjin Park, Jung-Hwan Park
Microneedles (MN) containing cross-linked hyaluronic acid (X-linked HA) particulates were prepared to control the degradation and swelling behavior after transdermal drug delivery. The X-linked HA particulates were prepared by cross-linking HA chains and then passing the particulates through a sieve. Then, microneedles were prepared by micromolding method. The rheological properties of X-linked HA were studied. The penetration success rate, mechanical failure, and dissolution rate of microneedles containing only hyaluronic acid (HA MN) and microneedles containing X-linked HA were compared...
February 8, 2018: Journal of Drug Targeting
https://www.readbyqxmd.com/read/29417711/design-of-a-short-thermally-stable-%C3%AE-helix-embedded-in-a-macrocycle
#19
Haifan Wu, Arusha Acharyya, Yibing Wu, Lijun Liu, Hyunil Jo, Feng Gai, William DeGrado
Although helices play key roles in peptide-protein and protein-protein interactions, the helical conformation is generally unstable for short peptides (10 - 15 residues) in aqueous solution in the absence of their binding partners. Thus, stabilizing the helical conformation of peptides can lead to increases in binding potency, specificity, and stability towards proteolytic degradation. Helices have been successfully stabilized by introducing sidechain-to-sidechain cross-links within the central portion of the helix...
February 7, 2018: Chembiochem: a European Journal of Chemical Biology
https://www.readbyqxmd.com/read/29411816/synergy-of-polypyrrole-and-carbon-x-aerogel-in-lithium-oxygen-batteries
#20
Christine H J Kim, Chakrapani V Varanasi, Jie Liu
A crucial step in the development of lithium-oxygen (Li-O2) batteries is to design an oxygen cathode with high catalytic activity and stable porous structure. Achieving such design requires an integrated strategy in which porosity, conductivity, catalytic activity, and mechanical durability are all considered in a battery system. Here, we develop polypyrrole-coated carbon x-aerogels with macroscopic 3D architecture, and demonstrate their potential as oxygen cathodes for Li-O2 batteries. This material, a novel and mechanically strong composite aerogel with polymer-cross-linked structure, not only provides effective pores that allow to store the discharge products and open channels for better oxygen diffusion, but also forms a robust 3D catalytic network that promotes both oxygen reduction and evolution reactions with improved mechanical and electrochemical stability...
February 7, 2018: Nanoscale
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