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https://www.readbyqxmd.com/read/28821078/fabrication-of-magnetic-particles-imprinted-cellulose-based-biocomposites-for-chromium-vi-removal
#1
Soodamani Periyasamy, Venkatrajan Gopalakannan, Natrayasamy Viswanathan
The present study was focused on Cr(VI) removal using eco-friendly materials like cellulose (Cel), hydrotalcite (HT), hydroxyapatite (HAp) and their composite forms. The cellulose/hydrotalcite (CelHT) and cellulose/hydroxyapatite (CelHAp) composites were synthesized by dispersing HT and HAp individually in cellulose polymeric matrix. To enhance the Cr(VI) sorption capacity (SC) and easy separation, cellulose supported magnetic composites namely iron-oxide coated cellulose/hydrotalcite (Fe3O4@CelHT) and cellulose/hydroxyapatite (Fe3O4@CelHAp) were synthesized by in situ fabrication method...
October 15, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28818781/dopamine-modified-highly-porous-hydroxyapatite-microtube-networks-with-efficient-near-infrared-photothermal-effect-enhanced-protein-adsorption-and-mineralization-performance
#2
Yong-Gang Zhang, Ying-Jie Zhu, Feng Chen, Bing-Qiang Lu
In the last decade, the porous hydroxyapatite (HAP) scaffold has been investigated for the application in tissue engineering owing to its good bioactivity and high biocompatibility. In this work, the dopamine-modified highly porous hydroxyapatite microtube three-dimensional (3-D) networks with efficient near-infrared photothermal effect, enhanced protein adsorption and mineralization performance have been prepared through a facile method. The dopamine-modified highly porous HAP networks exhibit ultrahigh porosity (90...
August 1, 2017: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/28818689/sol-gel-derived-hydroxyapatite-films-over-porous-calcium-polyphosphate-substrates-for-improved-tissue-engineering-of-osteochondral-like-constructs
#3
Whitaik David Lee, Rahul Gawri, Robert M Pilliar, William L Stanford, Rita A Kandel
Integration of in vitro-formed cartilage on a suitable substrate to form tissue-engineered implants for osteochondral defect repair is a considerable challenge. In healthy cartilage, a zone of calcified cartilage (ZCC) act as an intermediary for mechanical force transfer from soft to hard tissue, as well as an effective interlocking structure to better resist interfacial shear forces. We have developed biphasic constructs that consist of scaffold-free cartilage tissue grown in vitro on, and interdigitated with, porous calcium polyphosphate (CPP) substrates...
August 14, 2017: Acta Biomaterialia
https://www.readbyqxmd.com/read/28817981/the-use-of-flexible-intramedullary-nails-in-limb-lengthening
#4
Arnold Popkov, Patrick Foster, Alexander Gubin, Dmitry Borzunov, Dmitry Popkov
Lower and upper limb length discrepancy and deformity, congenital or acquired, are amongst the most common conditions in children for orthopaedic referral. Over the last twenty years, surgical techniques have evolved in an attempt to decrease Healing Index and minimise these complications. Areas covered: The flexible intramedullary nailing (FIN) is a minimally invasive intramedullary osteosynthesis. In combination with an external fixator, it is appropriated for pediatric bone lengthenings and lengthening of bones of small diameter in adults...
August 18, 2017: Expert Review of Medical Devices
https://www.readbyqxmd.com/read/28815162/clinical-application-of-ceramics-in-anterior-cervical-discectomy-and-fusion-a-review-and-update
#5
REVIEW
Shayan Abdollah Zadegan, Aidin Abedi, Seyed Behnam Jazayeri, Hirbod Nasiri Bonaki, Alexander R Vaccaro, Vafa Rahimi-Movaghar
STUDY DESIGN: Narrative review. OBJECTIVES: Anterior cervical discectomy and fusion (ACDF) is a reliable procedure, commonly used for cervical degenerative disc disease. For interbody fusions, autograft was the gold standard for decades; however, limited availability and donor site morbidities have led to a constant search for new materials. Clinically, it has been shown that calcium phosphate ceramics, including hydroxyapatite (HA) and tricalcium phosphate (TCP), are effective as osteoconductive materials and bone grafts...
June 2017: Global Spine Journal
https://www.readbyqxmd.com/read/28814954/intrinsic-osteoinductivity-of-porous-titanium-scaffold-for-bone-tissue-engineering
#6
Maryam Tamaddon, Sorousheh Samizadeh, Ling Wang, Gordon Blunn, Chaozong Liu
Large bone defects and nonunions are serious complications that are caused by extensive trauma or tumour. As traditional therapies fail to repair these critical-sized defects, tissue engineering scaffolds can be used to regenerate the damaged tissue. Highly porous titanium scaffolds, produced by selective laser sintering with mechanical properties in range of trabecular bone (compressive strength 35 MPa and modulus 73 MPa), can be used in these orthopaedic applications, if a stable mechanical fixation is provided...
2017: International Journal of Biomaterials
https://www.readbyqxmd.com/read/28808430/amelogenin-affects-brushite-crystal-morphology-and-promotes-its-phase-transformation-to-monetite
#7
Dongni Ren, Qichao Ruan, Jinhui Tao, Jonathan Lo, Steven Nutt, Janet Moradian-Oldak
Amelogenin protein is involved in organized apatite crystallization during enamel formation. Brushite (CaHPO4·2H2O), one of the precursors of hydroxyapatite mineralization in vitro, has been used for fabrication of biomaterials for hard tissue repair. In order to explore its potential application in biomimetic material synthesis, we studied the influence of the enamel protein amelogenin on brushite morphology and phase transformation to monetite. Our results show that amelogenin can adsorb onto the surface of brushite, leading to the formation of layered morphology on the (010) face...
September 7, 2016: Crystal Growth & Design
https://www.readbyqxmd.com/read/28806146/three-dimensional-bioprinting-of-polycaprolactone-reinforced-gene-activated-bioinks-for-bone-tissue-engineering
#8
Gráinne M Cunniffe, Tomas Gonzalez-Fernandez, Andrew Daly, Binulal N Sathy, Oju Jeon, Eben Alsberg, Daniel J Kelly
Regeneration of complex bone defects remains a significant clinical challenge. Multi-tool biofabrication has permitted the combination of various biomaterials to create multifaceted composites with tailorable mechanical properties and spatially controlled biological function. In this study we sought to use bioprinting to engineer nonviral gene activated constructs reinforced by polymeric micro-filaments. A gene activated bioink was developed using RGD-γ-irradiated alginate and nano-hydroxyapatite (nHA) complexed to plasmid DNA (pDNA)...
August 14, 2017: Tissue Engineering. Part A
https://www.readbyqxmd.com/read/28805704/effects-of-adding-polysaccharides-and-citric-acid-into-sodium-dihydrogen-phosphate-mixing-solution-on-the-material-properties-of-gelatin-hybridized-calcium-phosphate-cement
#9
Keishi Kiminami, Toshiisa Konishi, Minori Mizumoto, Kohei Nagata, Michiyo Honda, Hidetoshi Arimura, Mamoru Aizawa
We have succeeded in improving the material properties of a chelate-setting calcium-phosphate cement (CPC), which is composed of hydroxyapatite (HAp) the surface of which has been modified with inositol hexaphosphate (IP6) by adding α-tricalcium phosphate (α-TCP) powder. In order to create a novel chelate-setting CPC with sufficient bioresorbability, gelatin particles were added into the IP6-HAp/α-TCP cement system to modify the material properties. The effects of adding polysaccharides (chitosan, chondroitin sulfate, and sodium alginate) into the sodium dihydrogen phosphate mixing solution on the material properties of the gelatin-hybridized CPC were evaluated...
August 12, 2017: Materials
https://www.readbyqxmd.com/read/28804996/in-vitro-evaluation-of-3d-bioprinted-tri-polymer-network-scaffolds-for-bone-tissue-regeneration
#10
Stephanie T Bendtsen, Mei Wei
In vitro evaluations provide vital information on the ability of tissue engineered scaffolds to support cell life and promote natural physiological behaviors in culture. Such assessments are necessary to conduct before implementation of the scaffolds for tissue healing in vivo. The scaffold extracellular matrix must provide the biochemical and mechanical cues necessary to promote cellular attachment, migration and proliferation before differentiation and new tissue deposition can occur. In this study, an in vitro evaluation was conducted to assess the ability of scaffolds 3D printed with a previously developed alginate-polyvinyl alcohol-hydroxyapatite formulation to promote proliferation of encapsulated MC3T3 cells...
August 14, 2017: Journal of Biomedical Materials Research. Part A
https://www.readbyqxmd.com/read/28803478/biomimetic-bone-like-hydroxyapatite-by-mineralization-on-supramolecular-porous-fiber-networks
#11
Bo Li, Lei Kan, Xinyue Zhang, Jie Li, Ruiting Li, Qinyuan Gui, Dengli Qiu, Fei He, Ning Ma, Yapei Wang, Hao Wei
Hydroxyapatite (HA), the main inorganic component of bone tissue, is mineralized with collagen fibril scaffolds during bone formation. Inspired by the process, a self-assembled porous network architecture was designed and synthesized by using the 2-ureido-4[1H]-pyrimidone (UPy) modified glycerol molecule UPy-Gly, which was further utilized as a template for biomimetic mineralization. When incubated in simulated body fluid (SBF), the HA nucleus first formed in the holes of the template by the induction of hydroxyls on the surface, grew along the nanofibers, and fused with the template to fabricate hydroxyapatite composites (UPy-Gly/HA)...
August 18, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28803411/electro-chemical-deposition-of-nano-hydroxyapatite-zinc-coating-on-titanium-metal-substrate
#12
N A El-Wassefy, F M Reicha, N S Aref
BACKGROUND: Titanium is an inert metal that does not induce osteogenesis and has no antibacterial properties; it is proposed that hydroxyapatite coating can enhance its bioactivity, while zinc can contribute to antibacterial properties and improve osseointegration. AIMS: A nano-sized hydroxyapatite-zinc coating was deposited on commercially pure titanium using an electro-chemical process, in order to increase its surface roughness and enhance adhesion properties...
August 13, 2017: International Journal of Implant Dentistry
https://www.readbyqxmd.com/read/28802851/does-hydroxyapatite-coating-of-uncemented-cups-improve-long-term-survival-an-analysis-of-28-605-primary-total-hip-arthroplasty-procedures-from-the-nordic-arthroplasty-register-association-nara
#13
Stergios Lazarinis, Keijo T Mäkelä, Antti Eskelinen, Leif Havelin, Geir Hallan, Søren Overgaard, Alma B Pedersen, Johan Kärrholm, Nils P Hailer
OBJECTIVE: It is unclear whether hydroxyapatite (HA) coating of uncemented cups used in primary total hip arthroplasty (THA) improves bone ingrowth and reduces the risk of aseptic loosening. We therefore investigated survival of different uncemented cups that were available with or without HA coating. METHOD: We investigated three different cup types used with or without HA coating registered in the Nordic Arthroplasty Register Association (NARA) database that were inserted due to osteoarthritis (n=28,605)...
August 9, 2017: Osteoarthritis and Cartilage
https://www.readbyqxmd.com/read/28802161/physicochemical-analysis-of-permian-coprolites-from-brazil
#14
M I C Rodrigues, J H da Silva, F Eroni P Santos, P Dentzien-Dias, J C Cisneros, A S de Menezes, P T C Freire, B C Viana
In this paper we performed the study of two coprolites (fossilized feces) collected from the exposed levels of the Pedra de Fogo Formation, Parnaiba Sedimentary Basin, and Rio do Rasto Formation, Paraná Sedimentary Basin, both of the Palaeozoic era (Permian age). They were characterized using X-ray diffractometry, infrared, Raman and energy dispersive spectroscopy techniques in order to aid our understanding of the processes of fossilization and to discuss issues related to the feeding habits of the animals which generated those coprolites, probably cartilaginous fishes...
August 8, 2017: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
https://www.readbyqxmd.com/read/28801830/cloning-and-expression-analysis-of-human-amelogenin-in-nicotiana-benthamiana-plants-by-means-of-a-transient-expression-system
#15
Mattia Pegoraro, Slavica Matić, Barbara Pergolizzi, Luca Iannarelli, Andrea M Rossi, Marco Morra, Emanuela Noris
Enamel is the covering tissue of teeth, made of regularly arranged hydroxyapatite crystals deposited on an organic matrix composed of 90% amelogenin that is completely degraded at the end of the enamel formation process. Amelogenin has a biomineralizing activity, forming nanoparticles or nanoribbons that guide hydroxyapatite deposit, and regenerative functions in bone and vascular tissue and in wound healing. Biotechnological products containing amelogenin seem to facilitate these processes. Here, we describe the production of human amelogenin in plants by transient transformation of Nicotiana benthamiana with constructs carrying synthetic genes with optimized human or plant codons...
August 11, 2017: Molecular Biotechnology
https://www.readbyqxmd.com/read/28800874/the-synthesis-characterization-and-in-vivo-study-of-mineral-substituted-hydroxyapatite-for-prospective-bone-tissue-rejuvenation-applications
#16
Dharman Govindaraj, Mariappan Rajan, Murugan A Munusamy, Abdullah A Alarfaj, Kishor Kumar Sadasivuni, S Suresh Kumar
Minerals substituted apatite (M-HA) nanoparticles were prepared by the precipitation of minerals and phosphate reactants in choline chloride-Thiourea (ChCl-TU) deep eutectic solvent (DESs) as a facile and green way approach. After preparation of nanoparticles (F-M-HA (F=Fresh solvent)), the DESs was recovered productively and reprocess for the preparation of R-M-HA nanoparticles (R=Recycle solvent).The functional groups, phase, surface texture and the elemental composition of the M-HA nanoparticles were evaluated by advance characterization methods...
August 8, 2017: Nanomedicine: Nanotechnology, Biology, and Medicine
https://www.readbyqxmd.com/read/28797809/the-role-of-titanium-dioxide-on-the-morphology-microstructure-and-bioactivity-of-grafted-cellulose-hydroxyapatite-nanocomposites-for-a-potential-application-in-bone-repair
#17
Saeed Saber-Samandari, Hamed Yekta, Sara Ahmadi, Kadhim Alamara
Fabrication and characterization of a novel 3D nanocomposite scaffold have been reported in this research. The purpose of developing this new 3D nanocomposite scaffolds is introducing an alternative treatment for bone tissue replacement. Outcomes confirmed that the morphology, microstructure and mechanical properties of synthesized 3D nanocomposite scaffolds closely mimics the properties of real bone tissue. The 3D nanocomposite scaffolds compose of nanoparticle hydroxyapatite which is embedded in the semi-IPN of polyacrylamide-grafted cellulose by free radical polymerization...
August 7, 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/28795167/effective-uv-ozone-irradiation-method-for-decontamination-of-hydroxyapatite-surfaces
#18
Keisuke Yasuda, Yohei Okazaki, Yasuhiko Abe, Kazuhiro Tsuga
The purpose of this study was to establish whether UV/ozone (O3) irradiation method can effectively decontaminate hydroxyapatite surfaces, including those modified by the treatment with 30% phosphoric acid solution through morphological and chemical surface analyses (surface roughness, X-ray photoelectron spectroscopy and wettability), and to evaluate the in vitro response of osteoblast-like MC3T3-E1 cells to the modified hydroxyapatite surface decontaminated via this method. The amount of carbon and the contact angle of hydroxyapatite surfaces were significantly decreased by UV/O3 irradiation that lasted for ≥ 5 and ≥ 3 min, respectively (P < 0...
August 2017: Heliyon
https://www.readbyqxmd.com/read/28794848/bioactive-calcium-phosphate-based-glasses-and-ceramics-and-their-biomedical-applications-a-review
#19
Md Towhidul Islam, Reda M Felfel, Ensanya A Abou Neel, David M Grant, Ifty Ahmed, Kazi M Zakir Hossain
An overview of the formation of calcium phosphate under in vitro environment on the surface of a range of bioactive materials (e.g. from silicate, borate, and phosphate glasses, glass-ceramics, bioceramics to metals) based on recent literature is presented in this review. The mechanism of bone-like calcium phosphate (i.e. hydroxyapatite) formation and the test protocols that are either already in use or currently being investigated for the evaluation of the bioactivity of biomaterials are discussed. This review also highlights the effect of chemical composition and surface charge of materials, types of medium (e...
January 2017: Journal of Tissue Engineering
https://www.readbyqxmd.com/read/28794471/quantifying-the-efficiency-of-hydroxyapatite-mineralising-peptides
#20
Robyn Plowright, David J Belton, David L Kaplan, Carole C Perry
We present a non-destructive analytical calibration tool to allow quantitative assessment of individual calcium phosphates such as hydroxyapatite (HAP) from mixtures including brushite. Many experimental approaches are used to evaluate the mineralising capabilities of biomolecules including peptides. However, it is difficult to quantitatively compare the efficacy of peptides in the promotion of mineralisation when inseparable mixtures of different minerals are produced. To address this challenge, a series of hydroxyapatite and brushite mixtures were produced as a percent/weight (0-100%) from pure components and multiple (N = 10) XRD patterns were collected for each mixture...
August 9, 2017: Scientific Reports
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