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https://www.readbyqxmd.com/read/28221758/synthesis-and-fabrication-of-collagen-coated-ostholamide-electrospun-nanofiber-scaffold-for-wound-healing
#1
Subramani Kandhasamy, Sathiamurthi Perumal, Balaraman Madhan, Narayanan Umamaheswari, Javaid Ahmad Banday, Paramasivan Thirumalai Perumal, Vichangal Pridiuldi Santhanakrishnan
A novel scaffold for effective wound healing treatment was developed utilizing natural product bearing collagen based biocompatible electro-spun nanofibres. Initially, ostholamide (OSA) was synthesized from osthole (a natural coumarin), characterized by 1H, 13C, DEPT-135 NMR, ESI-MS and FT-IR spectroscopy analysis. OSA was incorporated into Polyhydroxybutyrate (PHB) and Gelatin (GEL), which serve as templates for electro-spun nanofibers. The coating of OSA-PHB-GEL nanofibers with collagen resulted in PHB-GEL-OSA-COL nanofibrous scaffold which mimics extra cellular matrix and serves as an effective biomaterial for tissue engineering applications, especially for wound healing...
February 21, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28221751/molecular-engineering-and-design-of-semiconducting-polymer-dots-with-narrow-band-near-infrared-emission-for-in-vivo-biological-imaging
#2
Chi-Shiang Ke, Chia-Chia Fang, Jia-Ying Yan, Po-Jung Tseng, Joseph R Pyle, Chuan-Pin Chen, Shu-Yi Lin, Jixin Chen, Xuanjun Zhang, Yang-Hsiang Chan
This article describes the design and synthesis of donor-bridge-acceptor based semiconducting polymer dots (Pdots) that exhibit narrow-band emissions, ultrahigh brightness, and large Stokes shifts in the near-infrared (NIR) region. We systematically investigated the effect of π-bridges on the fluorescence quantum yields of the donor-bridge-acceptor based Pdots. The Pdots could be excited by a 488-nm or 532-nm laser and have a high fluorescence quantum yield of 33% with a Stokes shift over 200 nm. The emission full width at half-maximum of the Pdots can be as narrow as 29 nm, about 2...
February 21, 2017: ACS Nano
https://www.readbyqxmd.com/read/28218617/chimeric-protein-repair-of-laminin-polymerization-ameliorates-muscular-dystrophy-phenotype
#3
Karen K McKee, Stephanie C Crosson, Sarina Meinen, Judith R Reinhard, Markus A Rüegg, Peter D Yurchenco
Mutations in laminin α2-subunit (Lmα2, encoded by LAMA2) are linked to approximately 30% of congenital muscular dystrophy cases. Mice with a homozygous mutation in Lama2 (dy2J mice) express a nonpolymerizing form of laminin-211 (Lm211) and are a model for ambulatory-type Lmα2-deficient muscular dystrophy. Here, we developed transgenic dy2J mice with muscle-specific expression of αLNNd, a laminin/nidogen chimeric protein that provides a missing polymerization domain. Muscle-specific expression of αLNNd in dy2J mice resulted in strong amelioration of the dystrophic phenotype, manifested by the prevention of fibrosis and restoration of forelimb grip strength...
February 20, 2017: Journal of Clinical Investigation
https://www.readbyqxmd.com/read/28218511/engineering-of-radioiodine-labeled-gold-core-shell-nanoparticles-as-efficient-nuclear-medicine-imaging-agents-for-trafficking-of-dendritic-cells
#4
Sang Bong Lee, Sang-Woo Lee, Shin Young Jeong, GhilSuk Yoon, Sung Jin Cho, Sang Kyoon Kim, In-Kyu Lee, Byeong-Cheol Ahn, Jaetae Lee, Yong Hyun Jeon
The development of highly sensitive, stable, and biocompatible imaging agents allowing visualization of dendritic cell (DC) migration is one of the essential factors for effective DC-based immunotherapy. Here, we used a novel and efficient synthesis approach to develop Radioiodine-124-labeled Tannic Acid Gold Core-Shell Nanoparticles (124I-TA-Au@AuNPs) for DC labeling and in vivo tracking of their migration using positron emission tomography (PET). 124I-TA-Au@AuNPs were produced within 40 min in high yield via straightforward tannic acid-mediated radiolabeling chemistry and incorporation of Au shell, which resulted in high radio-sensitivity and excellent chemical stability of nanoparticles in DCs and living mice...
February 20, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28217659/the-prospective-opportunities-offered-by-magnetic-scaffolds-for-bone-tissue-engineering-a-review
#5
Alessandro Ortolani, Michele Bianchi, Massimiliano Mosca, Silvio Caravelli, Mario Fuiano, Maurilio Marcacci, Alessandro Russo
Magnetic scaffolds are becoming increasingly attractive in tissue engineering, due to their ability to enhance bone tissue formation by attracting soluble factors, such as growth factors, hormones and polypeptides, directly to the implantation site, as well as their potential to improve the fixation and stability of the implant. Moreover, there is increasing evidence that the synergistic effects of magnetic scaffolds and magnetic fields can promote bone repair and regeneration. In this manuscript we review the recent innovations in bone tissue engineering that exploit magnetic biomaterials combined with static magnetic fields to enhance bone cell adhesion and proliferation, and thus bone tissue growth...
October 2016: Joints
https://www.readbyqxmd.com/read/28216954/optimization-characterization-and-efficacy-evaluation-of-2-chitosan-scaffold-for-tissue-engineering-and-wound-healing
#6
Priyanka Chhabra, Priyanka Tyagi, Aseem Bhatnagar, Gaurav Mittal, Amit Kumar
OBJECTIVE: To develop a chitosan-based scaffold and carry out a complete comprehensive study encompassing optimization of exact chitosan strength, product characterization, toxicity evaluation, in vitro validation in cell culture experiments, and finally in vivo efficacy in animal excision wound model. MATERIALS AND METHODS: Developed chitosan scaffolds (CSs) were optimized for tissue engineering and wound healing efficacy by means of microstructure, toxicity, and biocompatibility evaluation...
October 2016: Journal of Pharmacy & Bioallied Sciences
https://www.readbyqxmd.com/read/28214590/green-engineered-biomolecule-capped-silver-and-copper-nanohybrids-using-prosopis-cineraria-leaf-extract-enhanced-antibacterial-activity-against-microbial-pathogens-of-public-health-relevance-and-cytotoxicity-on-human-breast-cancer-cells-mcf-7
#7
U Jinu, M Gomathi, I Saiqa, N Geetha, G Benelli, P Venkatachalam
This research focused on green engineering and characterization of silver (PcAgNPs) and copper nanoparticles (PcCuNPs) using Prosopis cineraria (Pc) leaf extract prepared by using microwave irradiation. We studied their enhanced antimicrobial activity on human pathogens as well as cytotoxicity on breast cancer cells (MCF-7). Biofabricated silver and copper nanoparticles exhibited UV-Visible absorbance peaks at 420 nm and 575 nm, confirming the bioreduction and stabilization of nanoparticles. Nanoparticles were characterized by FTIR, XRD, FESEM, and EDX analysis...
February 15, 2017: Microbial Pathogenesis
https://www.readbyqxmd.com/read/28212489/direct-single-enzyme-biomineralization-of-catalytically-active-ceria-and-ceria-zirconia-nanocrystals
#8
Christopher D Curran, Li Lu, Yue Jia, Christopher J Kiely, Bryan W Berger, Steven McIntosh
Biomineralization is an intriguing approach to the synthesis of functional inorganic materials for energy applications whereby biological systems are engineered to mineralize inorganic materials and control their structure over multiple length scales under mild reaction conditions. Herein we demonstrate a single enzyme mediated biomineralization route to synthesize crystalline, catalytically active, quantum confined ceria (CeO2-x) and ceria-zirconia (Ce1-yZryO2-x) nanocrystals for application as environmental catalysts...
February 17, 2017: ACS Nano
https://www.readbyqxmd.com/read/28211453/mechanism-of-partial-agonism-in-ampa-type-glutamate-receptors
#9
Hector Salazar, Clarissa Eibl, Miriam Chebli, Andrew Plested
Neurotransmitters trigger synaptic currents by activating ligand-gated ion channel receptors. Whereas most neurotransmitters are efficacious agonists, molecules that activate receptors more weakly-partial agonists-also exist. Whether these partial agonists have weak activity because they stabilize less active forms, sustain active states for a lesser fraction of the time or both, remains an open question. Here we describe the crystal structure of an α-amino-3-hydroxy-5-methyl-4-isoxazolepropionate receptor (AMPAR) ligand binding domain (LBD) tetramer in complex with the partial agonist 5-fluorowillardiine (FW)...
February 17, 2017: Nature Communications
https://www.readbyqxmd.com/read/28208631/a-novel-strain-based-method-to-estimate-tire-conditions-using-fuzzy-logic-for-intelligent-tires
#10
Daniel Garcia-Pozuelo, Oluremi Olatunbosun, Jorge Yunta, Xiaoguang Yang, Vicente Diaz
The so-called intelligent tires are one of the most promising research fields for automotive engineers. These tires are equipped with sensors which provide information about vehicle dynamics. Up to now, the commercial intelligent tires only provide information about inflation pressure and their contribution to stability control systems is currently very limited. Nowadays one of the major problems for intelligent tire development is how to embed feasible and low cost sensors to obtain reliable information such as inflation pressure, vertical load or rolling speed...
February 10, 2017: Sensors
https://www.readbyqxmd.com/read/28207779/self-organized-synchronization-of-digital-phase-locked-loops-with-delayed-coupling-in-theory-and-experiment
#11
Lucas Wetzel, David J Jörg, Alexandros Pollakis, Wolfgang Rave, Gerhard Fettweis, Frank Jülicher
Self-organized synchronization occurs in a variety of natural and technical systems but has so far only attracted limited attention as an engineering principle. In distributed electronic systems, such as antenna arrays and multi-core processors, a common time reference is key to coordinate signal transmission and processing. Here we show how the self-organized synchronization of mutually coupled digital phase-locked loops (DPLLs) can provide robust clocking in large-scale systems. We develop a nonlinear phase description of individual and coupled DPLLs that takes into account filter impulse responses and delayed signal transmission...
2017: PloS One
https://www.readbyqxmd.com/read/28206750/synthetic-riboswitches-from-plug-and-pray-towards-plug-and-play
#12
Maja Etzel, Mario Mörl
In synthetic biology, metabolic engineering as well as gene therapy there is a strong demand for orthogonal or externally controlled regulation of gene expression. Here, RNA-based regulatory devices represent a promising emerging alternative to proteins, allowing a fast and direct control of gene expression, as no synthesis of regulatory proteins is required. Besides programmable ribozyme elements controlling mRNA stability, regulatory RNA structures in untranslated regions are highly interesting for engineering approaches...
February 16, 2017: Biochemistry
https://www.readbyqxmd.com/read/28202966/stable-colloids-in-molten-inorganic-salts
#13
Hao Zhang, Kinjal Dasbiswas, Nicholas B Ludwig, Gang Han, Byeongdu Lee, Suri Vaikuntanathan, Dmitri V Talapin
A colloidal solution is a homogeneous dispersion of particles or droplets of one phase (solute) in a second, typically liquid, phase (solvent). Colloids are ubiquitous in biological, chemical and technological processes, homogenizing highly dissimilar constituents. To stabilize a colloidal system against coalescence and aggregation, the surface of each solute particle is engineered to impose repulsive forces strong enough to overpower van der Waals attraction and keep the particles separated from each other...
February 15, 2017: Nature
https://www.readbyqxmd.com/read/28202898/engineering-a-lys-asn-isopeptide-bond-into-an-immunoglobulin-like-protein-domain-enhances-its-stability
#14
Hanna Kwon, Paul G Young, Christopher J Squire, Edward N Baker
The overall stability of globular protein structures is marginal, a balance between large numbers of stabilizing non-covalent interactions and a destabilizing entropic term. Higher stability can be engineered by introduction of disulfide bonds, provided the redox environment is controlled. The discovery of stabilizing isopeptide bond crosslinks, formed spontaneously between lysine and asparagine (or aspartic acid) side chains in certain bacterial cell-surface proteins suggests that such bonds could be introduced by protein engineering as an alternative protein stabilization strategy...
February 16, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28202413/engineered-antibody-ch2-domains-binding-to-nucleolin-isolation-characterization-and-improvement-of-aggregation
#15
De-Zhi Li, Rui Gong, Jun Zheng, Xi-Hai Chen, Dimiter S Dimitrov, Qi Zhao
Smaller recombinant antibody fragments are now emerging as alternatives of conventional antibodies. Especially, immunoglobulin (Ig) constant CH2 domain and engineered CH2 with improved stability are promising as scaffolds for selection of specific binders to various antigens. We constructed a yeast display library based on an engineered human IgG1 CH2 scaffold with diversified loop regions. A group of CH2 binders were isolated from this yeast display library by panning against nucleolin, which is a tumor-associated antigen involved in cell proliferation, tumor cell growth and angiogenesis...
February 12, 2017: Biochemical and Biophysical Research Communications
https://www.readbyqxmd.com/read/28201890/structure-property-relationships-in-cubic-cuprous-iodide-a-novel-view-on-stability-chemical-bonding-and-electronic-properties
#16
A Pishtshev, S Zh Karazhanov
Based on the combination of density functional theory and theory-group methods, we performed systematic modeling of γ-CuI structural design at the atomistic level. Being started from the metallic copper lattice, we treated a crystal assembly as a stepwise iodination process characterized in terms of a sequence of intermediate lattice geometries. These geometries were selected and validated via screening of possible structural transformations. The genesis of chemical bonding was studied for three structural transformations by analyzing the relevant changes in the topology of valence electron densities...
February 14, 2017: Journal of Chemical Physics
https://www.readbyqxmd.com/read/28199084/novel-cell-inorganic-hybrid-catalytic-interfaces-with-enhanced-enzymatic-activity-and-stability-for-sensitive-biosensing-of-paraoxon
#17
Lei Han, Aihua Liu
To improve the biosensing performance of organophosphorus hydrolase (OPH), the novel bioinorganic hybrid catalysts were facilely explored by biomineralization and cell surface display technology. During biomineralization, cobalt phosphate crystals were deposited onto the surface of OPH-fused bacteria, and the inorganic crystals at middle of cell collapsed inwardly to form the final spindle morphology because of the lowest energy principle and the mechanics principle. OPH would show the allosteric effect from "inactive" form to "active" form, and the "active" form was "fixed" when OPH was embedded into cobalt phosphate...
February 15, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28199046/bone-regeneration-in-a-rabbit-critical-femoral-defect-by-means-of-magnetic-hydroxyapatite-macroporous-scaffolds
#18
A Russo, M Bianchi, M Sartori, M Boi, G Giavaresi, D M Salter, M Jelic, M C Maltarello, A Ortolani, S Sprio, M Fini, A Tampieri, M Marcacci
Magnetic scaffolds have recently attracted significant attention in tissue engineering due to the prospect of improving bone tissue formation by conveying soluble factors such as growth factors, hormones, and polypeptides directly to the site of implantation, as well as to the possibility of improving implant fixation and stability. The objective of this study was to compare bone tissue formation in a preclinical rabbit model of critical femoral defect treated either with a hydroxyapatite (HA)/magnetite (90/10 wt %) or pure HA porous scaffolds at 4 and 12 weeks after implantation...
February 15, 2017: Journal of Biomedical Materials Research. Part B, Applied Biomaterials
https://www.readbyqxmd.com/read/28198594/interfacial-engineering-of-perovskite-solar-cells-by-employing-a-hydrophobic-copper-phthalocyanine-derivative-as-hole-transporting-material-with-improved-performance-and-stability
#19
Ze Yu, Xiaoqing Jiang, Jianbo Lai, Yuchen Zhang, Maowei Hu, Ning Lei, Dongping Wang, Xichuan Yang, Licheng Sun
In high-performance perovskite solar cells (PSCs), hole-transporting materials (HTMs) play important roles in extracting and transporting the photo-generated holes from the perovskite absrorber to the cathode, thus reducing unwanted recombination losses and enhancing the photovoltaic performance. Herein, solution-processable tetra-4-(bis(4-tert-butyl)phenyl)amino)phenoxy-substituted copper phthalocyanine (CuPc-OTPAtBu) has been synthesized and explored as a HTM in PSCs. The optical, electrochemical and thermal properties are fully characterized for this organic metal complex...
February 15, 2017: ChemSusChem
https://www.readbyqxmd.com/read/28198574/sn-mos2-c-c-microspheres-as-a-sodium-ion-battery-anode-material-with-high-capacity-and-long-cycle-life
#20
Fenghua Zheng, Qichang Pan, Chenghao Yang, Xunhui Xiong, Xing Ou, Renzong Hu, Yu Chen, Meilin Liu
Sodium ion batteries (SIBs) have been regarded as a prime candidate for large-scale energy storage, and developing high performance anode material is one of the main challenges for advanced SIBs. Here, novel structured Sn-MoS2-C@C microspheres, in which Sn nanoparticles are evenly embedded in MoS2 nanosheets and a thin carbon film is homogenously engineered over the microspheres, have been fabricated by the hydrothermal method. The Sn-MoS2-C@C microspheres demonstrate an excellent Na-storage performance as an anode of SIBs, deliver a high reversible charge capacity (580...
February 15, 2017: Chemistry: a European Journal
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