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https://www.readbyqxmd.com/read/28524375/bioprinted-osteogenic-and-vasculogenic-patterns-for-engineering-3d-bone-tissue
#1
Batzaya Byambaa, Nasim Annabi, Kan Yue, Grissel Trujillo-de Santiago, Mario Moisés Alvarez, Weitao Jia, Mehdi Kazemzadeh-Narbat, Su Ryon Shin, Ali Tamayol, Ali Khademhosseini
Fabricating 3D large-scale bone tissue constructs with functional vasculature has been a particular challenge in engineering tissues suitable for repairing large bone defects. To address this challenge, an extrusion-based direct-writing bioprinting strategy is utilized to fabricate microstructured bone-like tissue constructs containing a perfusable vascular lumen. The bioprinted constructs are used as biomimetic in vitro matrices to co-culture human umbilical vein endothelial cells and bone marrow derived human mesenchymal stem cells in a naturally derived hydrogel...
May 19, 2017: Advanced Healthcare Materials
https://www.readbyqxmd.com/read/28516996/growth-of-two-dimensional-silica-and-aluminosilicate-bilayers-on-pd-111-from-incommensurate-to-commensurate-crystalline
#2
Jin-Hao Jhang, Chao Zhou, Omur E Dagdeviren, Gregory S Hutchings, Udo D Schwarz, Eric I Altman
Two-dimensional (2D) silica (SiO2) and aluminosilicate (AlSi3O8) bilayers grown on Pd(111) were fabricated and systematically studied using ultrahigh vacuum surface analysis in combination with theoretical methods, including Auger electron spectroscopy, X-ray photoelectron spectroscopy, low-energy electron diffraction (LEED), scanning tunneling microscopy (STM), and density functional theory. Based on LEED results, both SiO2 and AlSi3O8 bilayers start ordering above 850 K in 2 × 10(-6) Torr oxygen. Both bilayers show hexagonal LEED patterns with a periodicity approximately twice that of the Pd(111) surface...
May 31, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28504165/calcium-silicate-nanowires-an-effective-alternative-for-improving-mechanical-properties-of-chitosan-hydroxyethyl-methacrylate-hema-copolymer-nanocomposites
#3
Sarang S Bari, Satyendra Mishra
Nanowires of calcium silicate were successfully synthesized by ultrasonic irradiation process and incorporated into chitosan and hydroxyetheyl methacrylate (HEMA) copolymer matrix by solution blending for efficacious preparation of biodegradable nanocomposites. Remarkable improvement in mechanical properties of the nanocomposites was noticed after micro-tensile analysis. Enlarged surface area and higher aspect ratio of CaSiO3 nanowires were the key factors responsible for such improvement. This was supported by EDS and XRD analysis in terms of proper distribution of nanofiller through the copolymer matrix and corresponding rise in percentage crystallanity respectively...
August 1, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28415532/preparation-of-micro-porous-bioceramic-containing-silicon-substituted-hydroxyapatite-and-beta-tricalcium-phosphate
#4
Lih-Jyh Fuh, Ya-Jing Huang, Wen-Cheng Chen, Dan-Jae Lin
Dimensional instability caused by sintering shrinkage is an inevitable drawback for conventional processing of hydroxyapatite (HA). A new preparation method for biphasic calcium phosphates was developed to increase micro pores and biodegradation without significant dimensional change. Powder pressed HA discs, under 100MPa, were immersed in a colloidal mixture of tetraethoxysilane (TEOS) and ammonium hydroxide for 10min, followed by drying, and then were sintered at 900°C, 1050°C, and 1200°C, respectively...
June 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28415463/in-vitro-characterisation-of-a-sol-gel-derived-in-situ-silica-coated-silicate-and-carbonate-co-doped-hydroxyapatite-nanopowder-for-bone-grafting
#5
Seyed Mohsen Latifi, Mohammadhossein Fathi, Ali Sharifnabi, Jaleh Varshosaz
Design and synthesis of materials with better properties and performance are essential requirements in the field of biomaterials science that would directly improve patient quality of life. For this purpose, in situ silica-coated silicate and carbonate co-doped hydroxyapatite (Sc/S.C.HA) nanopowder was synthesized via the sol-gel method. Characterisation of the prepared nanopowder was carried out by XRD, FTIR, TEM, SEM, EDX, ICP, zeta potential, acid dissolution test, and cell culture test. The substitution of the silicate and carbonate ions into hydroxyapatite structure was confirmed by FTIR analysis...
June 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28402086/the-effect-of-increased-microporosity-on-bone-formation-within-silicate-substituted-scaffolds-in-an-ovine-posterolateral-spinal-fusion-model
#6
Melanie Jean Coathup, Gordon William Blunn, Charlie Campion, Chih-Yuan Ho, Karin Angela Hing
This study compared the bone forming capacity of the same formulation of silicate-substituted bone graft substitute materials with different microporosity in an instrumented posterolateral spinal fusion ovine model. Materials with a strut porosity of (i) 22.5% (SiCaP) or (ii) 36.0% (SiCaP(+)) were packed along either side of the spine. Bone apposition rates, % new bone formation, % bone-implant contact, and % graft resorption were quantified at 8, 12, and 24 weeks post surgery. Computed Tomography (CT) was used to grade the formation of fusion bridges between vertebrae...
May 2017: Journal of Biomedical Materials Research. Part B, Applied Biomaterials
https://www.readbyqxmd.com/read/28379012/phase-transfer-and-ion-pairing-catalysis-of-pentanidiums-and-bisguanidiniums
#7
Lili Zong, Choon-Hong Tan
Catalysts accelerate biological processes and organic reactions in a controlled and selective fashion. There are continuing efforts in asymmetric catalysis to develop efficient catalysts with broad reaction scope and industrial practicability. Among the various modes of asymmetric catalysis, phase-transfer catalysis has attracted intense interest due to its facile scale up and low catalyst loading. Chiral quaternary ammonium and phosphonium salts are well-studied classes of chiral phase-transfer catalysts, and they are typically composed of sp(3)-hybridized quaternary onium salts...
April 5, 2017: Accounts of Chemical Research
https://www.readbyqxmd.com/read/28348275/strontium-doped-calcium-silicate-bioceramic-with-enhanced-in-vitro-osteogenic-properties
#8
Young Jung No, Seyed-Iman Roohani-Esfahani, Zufu Lu, Jeffrey Shi, Hala Zreiqat
Gehlenite (GLN, Ca2SiAl2O7) is a bioceramic that has been recently shown to possess excellent mechanical strength and in vitro osteogenic properties for bone regeneration. Substitutional incorporation of strontium in place of calcium is an effective way to further enhance biological properties of calcium-based bioceramics and glasses. However, such strategy has the potential to affect other important physicochemical parameters such as strength and degradation due to differences in the ionic radius of strontium and calcium...
March 28, 2017: Biomedical Materials
https://www.readbyqxmd.com/read/28346797/substituted-borosilicate-glasses-with-improved-osteogenic-capacity-for-bone-tissue-engineering
#9
João S Fernandes, Piergiorgio Gentile, Aileen Crawford, Ricardo A Pires, Paul V Hatton, Rui L Reis
Borosilicate bioactive glasses (BBGs) have shown the capacity to promote higher formation of new bone when compared with silicate bioactive glasses. Herein, we assessed the capacity of BBGs to induce osteogenic differentiation of bone marrow mesenchymal stem cells (BM-MSCs) as a function of their substituted divalent cations (Mg(2+), Ca(2+), Sr(2+)). To this purpose, we synthesized BBG particles by melt quenching. The cell viability, proliferation, and morphology (i.e., PrestoBlue(®), PicoGreen(®), and DAPI and Phalloidin stainings, respectively), as well as protein expression (i...
March 27, 2017: Tissue Engineering. Part A
https://www.readbyqxmd.com/read/28322056/preparation-of-ultrathin-robust-nanohybrid-capsules-through-a-beyond-biomineralization-method
#10
Shaohua Zhang, Zhongyi Jiang, Weilun Qian, Jiafu Shi, Xiaoli Wang, Lei Tang, Hongjian Zou, Hua Liu
Herein, a facile and generic method is developed to prepare ultrathin, robust nanohybrid capsules by manipulating the dynamic structure of supramolecular nanocoatings on CaCO3 sacrificial templates by incorporating a multivalent-anion substitution process into biomineralization. Above the biomineralization level, multivalent anions, for example, phosphate, sulfate, or citrate, are used to initiate the assembly of polyamine into continuous (nonsegregated) polyamine-anion supramolecular nanocoatings on CaCO3 sacrificial templates...
March 30, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28281635/aluminum-induced-dreierketten-chain-cross-links-increase-the-mechanical-properties-of-nanocrystalline-calcium-aluminosilicate-hydrate
#11
Guoqing Geng, Rupert J Myers, Jiaqi Li, Roya Maboudian, Carlo Carraro, David A Shapiro, Paulo J M Monteiro
The incorporation of Al and increased curing temperature promotes the crystallization and cross-linking of calcium (alumino)silicate hydrate (C-(A-)S-H), which is the primary binding phase in most contemporary concrete materials. However, the influence of Al-induced structural changes on the mechanical properties at atomistic scale is not well understood. Herein, synchrotron radiation-based high-pressure X-ray diffraction is used to quantify the influence of dreierketten chain cross-linking on the anisotropic mechanical behavior of C-(A-)S-H...
March 10, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28281315/silicates-in-orthopedics-and-bone-tissue-engineering-materials
#12
REVIEW
Xianfeng Zhou, Nianli Zhang, Steven Mankoci, Nita Sahai
Following the success of silicate-based glasses as bioactive materials, silicates are believed to play important roles in promoting bone formation and have therefore been considered to provide a hydroxyapatite (HAP) surface layer capable of binding to bone as well as potentially being a pro-osteoinductive factor. Natural silicate minerals and silicate-substituted HAPs are also being actively investigated as orthopaedic bone and dental biomaterials for application in tissue engineering. However, the mechanisms for the proposed roles of silicate in these materials have not been fully understood and are controversial...
March 9, 2017: Journal of Biomedical Materials Research. Part A
https://www.readbyqxmd.com/read/28278046/multilayered-polyion-complexes-with-dissolvable-silica-layer-covered-by-controlling-densities-of-crgd-conjugated-peg-chains-for-cancer-targeted-sirna-delivery
#13
Mitsuru Naito, Ryota Azuma, Hiroyasu Takemoto, Mao Hori, Naoto Yoshinaga, Shigehito Osawa, Rimpei Kamegawa, Hyun Jin Kim, Takehiko Ishii, Nobuhiro Nishiyama, Kanjiro Miyata, Kazunori Kataoka
Surface functionalization of nanoparticles is a crucial factor for nanoparticle-mediated drug and nucleic acid delivery. Particularly, the density of targeting ligands on nanoparticle significantly affects the affinity of nanoparticles to specific cellular surface (or receptor) through the multivalent binding effect. Herein, multilayered polyion complexes (mPICs) are prepared to possess varying densities of cyclic RGD peptide (cRGD) ligands for cancer-targeted small interfering RNA (siRNA) delivery. A template PIC is first prepared by mixing siRNAs with homo catiomers of N-substituted polyaspartamide bearing tetraethylenepentamine (PAsp(TEP)) in aqueous solution, followed by silica-coating through silicate condensation reaction...
March 12, 2017: Journal of Biomaterials Science. Polymer Edition
https://www.readbyqxmd.com/read/28257006/solid-state-nmr-and-short-range-order-in-crystalline-oxides-and-silicates-a-new-tool-in-paramagnetic-resonances
#14
Jonathan F Stebbins, Ryan J McCarty, Aaron C Palke
Most applications of high-resolution NMR to questions of short-range order/disorder in inorganic materials have been made in systems where ions with unpaired electron spins are of negligible concentration, with structural information extracted primarily from chemical shifts, quadrupolar coupling parameters, and nuclear dipolar couplings. In some cases, however, the often-large additional resonance shifts caused by interactions between unpaired electron and nuclear spins can provide unique new structural information in materials with contents of paramagnetic cations ranging from hundreds of ppm to several per cent and even higher...
March 1, 2017: Acta Crystallographica. Section C, Structural Chemistry
https://www.readbyqxmd.com/read/28091955/genome-wide-exploration-of-silicon-si-transporter-genes-lsi1-and-lsi2-in-plants-insights-into-si-accumulation-status-capacity-of-plants
#15
Recep Vatansever, Ibrahim Ilker Ozyigit, Ertugrul Filiz, Nermin Gozukara
Silicon (Si) is a nonessential, beneficial micronutrient for plants. It increases the plant stress tolerance in relation to its accumulation capacity. In this work, root Si transporter genes were characterized in 17 different plants and inferred for their Si-accumulation status. A total of 62 Si transporter genes (31 Lsi1 and 31 Lsi2) were identified in studied plants. Lsi1s were 261-324 residues protein with a MIP family domain whereas Lsi2s were 472-547 residues with a citrate transporter family domain. Lsi1s possessed characteristic sequence features that can be employed as benchmark in prediction of Si-accumulation status/capacity of the plants...
January 13, 2017: Biometals: An International Journal on the Role of Metal Ions in Biology, Biochemistry, and Medicine
https://www.readbyqxmd.com/read/28088144/more-room-for-microphase-separation-an-extended-study-on-binary-liquids-confined-in-sba-15-cylindrical-pores
#16
Ramona Mhanna, Abdel Razzak Abdel Hamid, Sujeet Dutta, Ronan Lefort, Laurence Noirez, Bernhard Frick, Denis Morineau
The confinement of liquid mixtures in porous channels provides new insight into fluid ordering at the nanoscale. In this study, we address a phenomenon of microphase separation, which appears as a novel fascinating confinement effect for fully miscible binary liquids. We investigate the structure of tert-butanol-toluene mixtures confined in the straight and mono-dispersed cylindrical nanochannels of SBA-15 mesoporous silicates (D = 8.3 nm). Small angle neutron scattering experiments on samples with carefully designed isotopic compositions are performed to systematically vary the scattering length density of the different compounds and assess the radial concentration profile of the confined phases...
January 14, 2017: Journal of Chemical Physics
https://www.readbyqxmd.com/read/28043751/bone-incorporation-of-silicate-substituted-calcium-phosphate-in-2-stage-revision-anterior-cruciate-ligament-reconstruction-a-histologic-and-radiographic-study
#17
Jan von Recum, Johannes Schwaab, Thorsten Guehring, Paul-Alfred Grützner, Marc Schnetzke
PURPOSE: To evaluate the histologic and radiographic outcomes of using silicate-substituted calcium phosphate (Si-CaP) as bone graft substitute for the augmentation of tunnel defects in 2-stage revision anterior cruciate ligament (ACL) reconstruction. METHODS: Forty patients undergoing 2-stage revision ACL reconstruction were included in a prospective, randomized controlled clinical trial between 2012 and 2015. The inclusion criteria were tunnel diameter of the tibial and/or femoral tunnel of 10 mm or greater after failed ACL reconstruction...
December 30, 2016: Arthroscopy: the Journal of Arthroscopic & related Surgery
https://www.readbyqxmd.com/read/27994411/comparative-evaluation-of-calcium-silicate-based-dentin-substitute-biodentine-%C3%A2-and-calcium-hydroxide-pulpdent-in-the-formation-of-reactive-dentin-bridge-in-regenerative-pulpotomy-of-vital-primary-teeth-triple-blind-randomized-clinical-trial
#18
Navneet Grewal, Rubica Salhan, Nirapjeet Kaur, Hemal Bipin Patel
BACKGROUND: Considering the biological concerns of calcium hydroxide (CH) as a pulpotomy agent, an alternative silicate based dentin substitute i.e. Biodentine (Ca3SiO5) was evaluated clinically and radiographically. AIMS: To evaluate the effectiveness of dentin substitute (Biodentine) in regenerative pulpotomy of vital primary teeth that would giv a biological base to its use in forming reactive dentin bridge and overcoming the drawbacks of calcium hydroxide. MATERIAL AND METHODS: Randomised clinical trial on 40 bilateral carious primary molars in 20 participant children (aged 5-10 years) was carried out by same operator using Ca3SiO5(group-1) and CH (group-2) as vital pulpotomy agents...
October 2016: Contemporary Clinical Dentistry
https://www.readbyqxmd.com/read/27973859/nanoscale-charge-balancing-mechanism-in-alkali-substituted-calcium-silicate-hydrate-gels
#19
V Ongun Özçelik, Claire E White
Alkali-activated materials and related alternative cementitious systems are sustainable technologies that have the potential to substantially lower the CO2 emissions associated with the construction industry. However, these systems have augmented chemical compositions as compared to ordinary Portland cement (OPC), which may impact the evolution of the hydrate phases. In particular, calcium-silicate-hydrate (C-S-H) gel, the main hydrate phase in OPC, is likely to be altered at the atomic scale due to changes in the bulk chemical composition, specifically via the addition of alkalis (i...
December 15, 2016: Journal of Physical Chemistry Letters
https://www.readbyqxmd.com/read/27966277/the-luminescent-properties-and-crystal-structure-of-sr-1-5-x-1-5y-mg0-5-sio4-xeu-2-yce-3-blue-phosphor-synthesized-by-co-precipitation-method
#20
Jin Shan Wang, Da-Chuan Zhu, Cong Zhao, Tao Han, ShaSha Liu
In order to improve the luminescent performance of silicate blue phosphors, Sr(1.5-x)-(1.5y) Mg0.5 SiO4 :xEu(2)(+) ,yCe(3+) phosphors were synthesized using one-step calcination of a precursor prepared by chemical co-precipitation. The crystal structure and luminescent properties of the phosphors were analyzed using X-ray diffraction and fluorescence spectrophotometry, respectively. Because the activated ions (Eu(2+) ) can occupy two different types of sites (Sr1 and Sr2 ), the emission spectrum of Eu(2)(+) excited at 350 nm contains two single bands (EM1 and EM2 ) in the wavelength range 400-550 nm, centered at 463 nm, and the emission intensity first increases and then decreases with increasing concentrations of Eu(2)(+) ions...
June 2017: Luminescence: the Journal of Biological and Chemical Luminescence
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