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https://www.readbyqxmd.com/read/29240126/analysis-of-long-term-visual-quality-with-numerical-3d-ray-tracing-after-corneal-crosslinking-treatment
#1
Staffan Schedin, Per Hallberg, Anders Behndig
A numerical 3D ray tracing model was used to evaluate the long-term visual effects of two regimens of corneal crosslinking (CXL) treatment of 48 patients with the corneal degeneration keratoconus. The 3D ray tracing analyses were based on corneal elevation data measured by Scheimpflug photography. Twenty-two patients were treated with standard CXL applied uniformly across the corneal surface, whereas 26 patients underwent a customized, refined treatment only at local zones on the cornea (photorefractive intrastromal CXL; PiXL)...
December 10, 2017: Applied Optics
https://www.readbyqxmd.com/read/29239719/live-cell-mapping-of-organelle-associated-rnas-via-proximity-biotinylation-combined-with-protein-rna-crosslinking
#2
Pornchai Kaewsapsak, David Michael Shechner, William Mallard, John L Rinn, Alice Y Ting
The spatial organization of RNA within cells is a crucial factor influencing a wide range of biological functions throughout all kingdoms of life. However, a general understanding of RNA localization has been hindered by a lack of simple, high-throughput methods for mapping the transcriptomes of subcellular compartments. Here, we develop such a method, termed APEX-RIP, which combines peroxidase-catalyzed, spatially restricted in situ protein biotinylation with RNA-protein chemical crosslinking. We demonstrate that, using a single protocol, APEX-RIP can isolate RNAs from a variety of subcellular compartments, including the mitochondrial matrix, nucleus, cytosol, and endoplasmic reticulum (ER), with specificity and sensitivity that rival or exceed those of conventional approaches...
December 14, 2017: ELife
https://www.readbyqxmd.com/read/29239525/isolation-of-sinapic-acid-from-broccoli-using-molecularly-imprinted-polymers
#3
Heba Hosny, Nesrine El Gohary, Engy Saad, Heba Handoussa, Rasha M El Nashar
A molecularly imprinted polymer was synthesized for the purpose of sinapic acid isolation from Egyptian nutraceutical Botrytis italica, L. (broccoli) due to its prominent medicinal and wide pharmacological activities. A computational study was first developed to determine the optimal template to functional monomer molar ratio. Based on the computational results, five polymers were synthesized using a bulk polymerization method with sinapic acid as the template molecule. Evaluation of the synthesized polymers binding performance was carried out using batch rebinding assay, which revealed that the molecularly imprinted polymer of molar ratio (1:4:20), template to functional monomer (4-vinyl pyridine) to crosslinker (ethylene glycol dimethacrylate) was of optimum performance, thus, this polymer was applied for sinapic acid isolation from closely related analogues...
December 14, 2017: Journal of Separation Science
https://www.readbyqxmd.com/read/29239103/out-of-plane-3d-printed-microfibers-improve-the-shear-properties-of-hydrogel-composites
#4
Mylène de Ruijter, Andrei Hrynevich, Jodie N Haigh, Gernot Hochleitner, Miguel Castilho, Jürgen Groll, Jos Malda, Paul D Dalton
One challenge in biofabrication is to fabricate a matrix that is soft enough to elicit optimal cell behavior while possessing the strength required to withstand the mechanical load that the matrix is subjected to once implanted in the body. Here, melt electrowriting (MEW) is used to direct-write poly(ε-caprolactone) fibers "out-of-plane" by design. These out-of-plane fibers are specifically intended to stabilize an existing structure and subsequently improve the shear modulus of hydrogel-fiber composites. The stabilizing fibers (diameter = 13...
December 14, 2017: Small
https://www.readbyqxmd.com/read/29238713/sodium-mercaptoethane-sulfonate-reduces-collagenolytic-degradation-and-synergistically-enhances-antimicrobial-durability-in-an-antibiotic-loaded-biopolymer-film-for-prevention-of-surgical-site-infections
#5
Joel Rosenblatt, Ruth A Reitzel, George M Viola, Nylev Vargas-Cruz, Jesse Selber, Issam Raad
Implant-associated surgical-site infections can have significant clinical consequences. Previously we reported a method for prophylactically disinfecting implant surfaces in surgical pockets, where an antibiotic solution containing minocycline (M) and rifampin (R) was applied as a solid film in a crosslinked biopolymer matrix that partially liquefied in situ to provide extended prophylaxis. Here we studied the effect of adding sodium 2-mercaptoethane sulfonate (MeSNA) on durability of prophylaxis in an in vitro model of implant-associated surgical-site infection...
2017: BioMed Research International
https://www.readbyqxmd.com/read/29238701/a-novel-heat-shock-element-hse-in-entamoeba-histolytica-that-regulates-the-transcriptional-activation-of-the-ehpgp5-gene-in-the-presence-of-emetine-drug
#6
Alma Nieto, David G Pérez Ishiwara, Esther Orozco, Virginia Sánchez Monroy, Consuelo Gómez García
Transcriptional regulation of the multidrug resistance EhPgp5 gene in Entamoeba histolytica is induced by emetine stress. EhPgp5 overexpression alters the chloride-dependent currents that cause trophozoite swelling, diminishing induced programmed cell death (PCD) susceptibility. In contrast, antisense inhibition of P-glycoprotein (PGP) expression produces synchronous death of trophozoites and the enhancement of the biochemical and morphological characteristics of PCD induced by G418. Transcriptional gene regulation analysis identified a 59 bp region at position -170 to -111 bp promoter as putative emetine response elements (EREs)...
2017: Frontiers in Cellular and Infection Microbiology
https://www.readbyqxmd.com/read/29237733/communication-between-n-terminus-and-loop2-tunes-orai-activation
#7
Marc Fahrner, Saurabh K Pandey, Martin Muik, Lukas Traxler, Carmen Butorac, Michael Stadlbauer, Vasilina Zayats, Adéla Krizova, Peter Plenk, Irene Frischauf, Rainer Schindl, Hermann J Gruber, Peter Hinterdorfer, Rüdiger Ettrich, Christoph Romanin, Isabella Derler
Ca2+ release-activated Ca2+ (CRAC) channels constitute the major Ca2+ entry pathway into the cell. They are fully reconstituted via intermembrane coupling of the Ca2+ selective Orai channel and the Ca2+ sensing protein STIM1. In addition to the Orai C-terminus, the main coupling site for STIM1, the Orai N-terminus is indispensable for Orai channel gating. Although the extended transmembrane Orai N-terminal (ETON) region (Orai1: aa73-91; Orai3: aa48-65) is fully conserved in the Orai1 and Orai3 isoforms, Orai3 tolerates larger N-terminal truncations than Orai1 in retaining store-operated activation...
December 13, 2017: Journal of Biological Chemistry
https://www.readbyqxmd.com/read/29237263/ph-reduction-dual-responsive-oxidized-alginate-doxorubicin-mpeg-oal-dox-cys-prodrug-nanohydrogels-effect-of-complexation-with-cyclodextrins
#8
Tingting Zhou, Jiagen Li, Xu Jia, Xubo Zhao, Peng Liu
Novel biocompatible and biodegradable pH/reduction dual-responsive oxidized alginate-doxorubicin (mPEG-OAL-DOX/Cys) prodrug nanohydrogels were designed for tumor-specific intracellular triggered release of anticancer drug DOX, by conjugating DOX via acid-labile Schiff base linkage into the PEGylated oxidized alginate (mPEG-OAL) crosslinked with bioreducible disulfide bond. The effect of the complexation with cyclodextrins (α-CD and -CD) before or after the crosslinking of the mPEG-OAL on the DOX content and controlled release performance was investigated...
December 13, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/29236117/liquid-crystal-elastomer-foams-with-elastic-properties-specifically-engineered-as-biodegradable-brain-tissue-scaffolds
#9
M E Prévôt, H Andro, S L M Alexander, S Ustunel, C Zhu, Z Nikolov, S T Rafferty, M T Brannum, B Kinsel, L T J Korley, E J Freeman, J A McDonough, R J Clements, E Hegmann
Tissue regeneration requires 3-dimensional (3D) smart materials as scaffolds to promote transport of nutrients. To mimic mechanical properties of extracellular matrices, biocompatible polymers have been widely studied and a diverse range of 3D scaffolds have been produced. We propose the use of responsive polymeric materials to create dynamic substrates for cell culture, which goes beyond designing only a physical static 3D scaffold. Here, we demonstrated that lactone- and lactide-based star block-copolymers (SBCs), where a liquid crystal (LC) moiety has been attached as a side-group, can be crosslinked to obtain Liquid Crystal Elastomers (LCEs) with a porous architecture using a salt-leaching method to promote cell infiltration...
December 13, 2017: Soft Matter
https://www.readbyqxmd.com/read/29235541/biodegradable-bisvinyl-sulfonemethyl-crosslinked-gelatin-conduit-promotes-regeneration-after-peripheral-nerve-injury-in-adult-rats
#10
Chien-Hsin Ko, Ming-You Shie, Jia-Horng Lin, Yi-Wen Chen, Chun-Hsu Yao, Yueh-Sheng Chen
In our previous study, we found that gelatin-based materials exhibit good conductivity and are non-cytotoxic. In this study, gelatin was cross-linked with bisvinyl sulfonemethyl (BVSM) to fabricate a biodegradable conduit for peripheral nerve repair. First, BVSM on the prepared conduit was characterized to determine its mechanical properties and contact angle. The maximum tensile strength and water contact angle of the gelatin-BVSM conduits were 23 ± 4.8 MPa and 74.7 ± 9°, which provided sufficient mechanical strength to resist muscular contraction; additionally, the surface was hydrophilic...
December 13, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29235413/facile-and-large-scale-synthesis-of-curcumin-pva-hydrogel-effectively-kill-bacteria-and-accelerate-cutaneous-wound-healing-in-the-rat
#11
Fei He, Hongjing Jiao, Yu Tian, Libo Zhao, Xiaozhu Liao, Zengjie Fan, Bin Liu
The complicated synthesis procedure and limited preparation size of hydrogel inhibit its clinical application. Therefore, a facile preparation method for large-size hydrogel is required. In this study, a series of curcumin (Cur)/polyvinyl alcohol (PVA) hydrogel in a large size with different Cur concentrations is prepared by a facile physical-chemical crosslinking. The physicochemical properties, antibacterial performance and accelerating wound healing ability are evaluated with the aim of attaining a novel and effective wound dressing...
December 13, 2017: Journal of Biomaterials Science. Polymer Edition
https://www.readbyqxmd.com/read/29235216/surface-molding-of-microscale-hydrogels-with-microactuation-functionality
#12
John J Bowen, Mark A Rose, Abhiteja Konda, Stephen A Morin
This work describes the fabrication of numerous hydrogel microstructures, μ-gels, via a process called "surface molding"-chemically patterned elastomeric assembly substrates were used to organize and manipulate the geometry of liquid prepolymer microdroplets, which, following photo-initiated crosslinking, maintained the desired morphology. By adjusting the state of strain during the crosslinking process, a continua of structures could be created using one pattern. These arrays of μ-gels have stimuli-responsive properties that are directly applicable to actuation where the basis shape and array geometry of the μ-gels can be used to rationally generate microactuators with programmed motions...
December 12, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/29235164/boosting-bifunctional-oxygen-electrocatalysis-with-3d-graphene-aerogel-supported-ni-mno-particles
#13
Gengtao Fu, Xiaoxiao Yan, Yifan Chen, Lin Xu, Dongmei Sun, Jong-Min Lee, Yawen Tang
Electrocatalysts for oxygen-reduction and oxygen-evolution reactions (ORR and OER) are crucial for metal-air batteries, where more costly Pt- and Ir/Ru-based materials are the benchmark catalysts for ORR and OER, respectively. Herein, for the first time Ni is combined with MnO species, and a 3D porous graphene aerogel-supported Ni/MnO (Ni-MnO/rGO aerogel) bifunctional catalyst is prepared via a facile and scalable hydrogel route. The synthetic strategy depends on the formation of a graphene oxide (GO) crosslinked poly(vinyl alcohol) hydrogel that allows for the efficient capture of highly active Ni/MnO particles after pyrolysis...
December 13, 2017: Advanced Materials
https://www.readbyqxmd.com/read/29235142/assessment-of-data-assisted-prediction-by-inclusion-of-crosslinking-mass-spectrometry-and-small-angle-x-ray-scattering-data-in-the-12th-critical-assessment-of-protein-structure-prediction-experiment
#14
Giorgio E Tamò, Luciano A Abriata, Giulia Fonti, Matteo Dal Peraro
Integrative modeling approaches attempt to combine experiments and computation to derive structure-function relationships in complex molecular assemblies. Despite their importance for the advancement of life sciences, benchmarking of existing methodologies is rather poor. The 12th round of the Critical Assessment of protein Structure Prediction (CASP) offered a unique niche to benchmark data and methods from two kinds of experiments often used in integrative modeling, namely residue-residue contacts obtained through crosslinking/mass-spectrometry (CLMS), and small-angle X-ray scattering (SAXS) experiments...
December 13, 2017: Proteins
https://www.readbyqxmd.com/read/29234069/the-human-dna-glycosylases-neil1-and-neil3-excise-psoralen-induced-dna-dna-cross-links-in-a-four-stranded-dna-structure
#15
Peter R Martin, Sophie Couvé, Caroline Zutterling, Mustafa S Albelazi, Regina Groisman, Bakhyt T Matkarimov, Jason L Parsons, Rhoderick H Elder, Murat K Saparbaev
Interstrand cross-links (ICLs) are highly cytotoxic DNA lesions that block DNA replication and transcription by preventing strand separation. Previously, we demonstrated that the bacterial and human DNA glycosylases Nei and NEIL1 excise unhooked psoralen-derived ICLs in three-stranded DNA via hydrolysis of the glycosidic bond between the crosslinked base and deoxyribose sugar. Furthermore, NEIL3 from Xenopus laevis has been shown to cleave psoralen- and abasic site-induced ICLs in Xenopus egg extracts. Here we report that human NEIL3 cleaves psoralen-induced DNA-DNA cross-links in three-stranded and four-stranded DNA substrates to generate unhooked DNA fragments containing either an abasic site or a psoralen-thymine monoadduct...
December 12, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29233890/phosphate-pi-regulated-heterodimerization-of-the-high-affinity-sodium-dependent-pi-transporters-pit1-slc20a1-and-pit2-slc20a2-underlies-extracellular-pi-sensing-independently-of-pi-uptake
#16
Nina Bon, Greig Couasnay, Annabelle Bourgine, Sophie Sourice, Sarah Beck-Cormier, Jérôme Guicheux, Laurent Beck
Extracellular phosphate (Pi) can act as a signaling molecule that directly alters gene expression and cellular physiology. The ability of cells or organisms to detect changes in extracellular Pi levels implies the existence of a Pi-sensing mechanism that signals to the body or individual cell. However, unlike in prokaryotes, yeasts, and plants, the molecular players involved in Pi sensing in mammals remain unknown. In this study, we investigated the involvement of the high-affinity, Na-dependent Pi transporters PiT1 and PiT2 in mediating Pi signaling in skeletal cells...
December 12, 2017: Journal of Biological Chemistry
https://www.readbyqxmd.com/read/29232007/increased-oxidative-protection-by-high-active-vitamin-e-content-and-partial-radiation-crosslinking-of-uhmwpe
#17
Jia-Zhuang Xu, Keith K Wannomae, Orhun K Muratoglu, Ebru Oral
Vitamin E stabilization successfully improved long-term oxidation resistance of wear-resistant ultra-high-molecular-weight polyethylene (UHMWPE) used for joint implants. Stabilization can be achieved by blending an antioxidant into the UHMWPE resin powder before consolidation and irradiation. Balancing the wear resistance and vitamin E content in the blend is the current challenge with this approach, because vitamin E hinders crosslinking of UHMWPE during irradiation, which decreases wear resistance. The vitamin E concentration in the blend is generally limited to less than 0...
December 12, 2017: Journal of Orthopaedic Research: Official Publication of the Orthopaedic Research Society
https://www.readbyqxmd.com/read/29231178/internal-structure-and-swelling-behaviour-of-i-in-silico-i-microgel-particles
#18
Lorenzo Rovigatti, Nicoletta Gnan, Emanuela Zaccarelli
Microgels are soft colloids that, in virtue of their polymeric nature, can react to external stimuli such as temperature or pH by changing their size. The resulting swelling/deswelling transition can be exploited in fundamental research as well as for many diverse practical applications, ranging from art restoration to medicine. Such an extraordinary versatility stems from the complex internal structure of the individual microgels, each of which is a crosslinked polymer network. Here we employ a recently-introduced computational method to generate realistic microgel configurations and look at their structural properties, both in real and Fourier space, for several temperatures across the volume phase transition as a function of the crosslinker concentration and of the confining radius employed during the ``in-silico'' synthesis...
December 12, 2017: Journal of Physics. Condensed Matter: An Institute of Physics Journal
https://www.readbyqxmd.com/read/29230720/erratum-to-robust-cost-effective-profiling-of-rna-binding-protein-targets-with-single-end-enhanced-crosslinking-and-immunoprecipitation-seclip
#19
Eric L Van Nostrand, Thai B Nguyen, Chelsea Gelboin-Burkhart, Ruth Wang, Steven M Blue, Gabriel A Pratt, Ashley L Louie, Gene W Yeo
No abstract text is available yet for this article.
2017: Methods in Molecular Biology
https://www.readbyqxmd.com/read/29229757/structure-and-activity-of-chix-a-peptidoglycan-hydrolase-required-for-chitinase-secretion-by-serratia-marcescens
#20
Richard A Owen, Paul K Fyfe, Adam Lodge, Jacob Biboy, Waldemar Vollmer, William N Hunter, Frank Sargent
The Gram-negative bacterium Serratia marcescens secretes a number of proteins that are involved in extracellular chitin degradation. This so-called chitinolytic machinery includes three types of chitinase enzymes and a lytic polysaccharide monooxygenase. An operon has been identified in S. marcescens , chiWXYZ , that is thought to be involved in the secretion of the chitinolytic machinery. Genetic evidence points to the ChiX protein being a key player in the secretion mechanism, since deletion of the chiX gene in S...
December 11, 2017: Biochemical Journal
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