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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/28812989/small-smart-fast-and-cheap-microchip-based-sensors-to-estimate-air-pollution-exposures-in-rural-households
#3
Ajay Pillarisetti, Tracy Allen, Ilse Ruiz-Mercado, Rufus Edwards, Zohir Chowdhury, Charity Garland, L Drew Hill, Michael Johnson, Charles D Litton, Nicholas L Lam, David Pennise, Kirk R Smith
Over the last 20 years, the Kirk R. Smith research group at the University of California Berkeley-in collaboration with Electronically Monitored Ecosystems, Berkeley Air Monitoring Group, and other academic institutions-has developed a suite of relatively inexpensive, rugged, battery-operated, microchip-based devices to quantify parameters related to household air pollution. These devices include two generations of particle monitors; data-logging temperature sensors to assess time of use of household energy devices; a time-activity monitoring system using ultrasound; and a CO₂-based tracer-decay system to assess ventilation rates...
August 16, 2017: Sensors
https://www.readbyqxmd.com/read/28811583/bacterial-diversity-among-four-healthcare-associated-institutes-in-taiwan
#4
Chang-Hua Chen, Yaw-Ling Lin, Kuan-Hsueh Chen, Wen-Pei Chen, Zhao-Feng Chen, Han-Yueh Kuo, Hsueh-Fen Hung, Chuan Yi Tang, Ming-Li Liou
Indoor microbial communities have important implications for human health, especially in health-care institutes (HCIs). The factors that determine the diversity and composition of microbiomes in a built environment remain unclear. Herein, we used 16S rRNA amplicon sequencing to investigate the relationships between building attributes and surface bacterial communities among four HCIs located in three buildings. We examined the surface bacterial communities and environmental parameters in the buildings supplied with different ventilation types and compared the results using a Dirichlet multinomial mixture (DMM)-based approach...
August 15, 2017: Scientific Reports
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
#5
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/28794471/quantifying-the-efficiency-of-hydroxyapatite-mineralising-peptides
#6
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
https://www.readbyqxmd.com/read/28790420/comparative-transcriptional-profiling-of-tildipirosin-resistant-and-sensitive-haemophilus-parasuis
#7
Zhixin Lei, Shulin Fu, Bing Yang, Qianying Liu, Saeed Ahmed, Lei Xu, Jincheng Xiong, Jiyue Cao, Yinsheng Qiu
Numerous studies have been conducted to examine the molecular mechanism of Haemophilus parasuis resistance to antibiotic, but rarely to tildipirosin. In the current study, transcriptional profiling was applied to analyse the variation in gene expression of JS0135 and tildipirosin-resistant JS32. The growth curves showed that JS32 had a higher growth rate but fewer bacteria than JS0135. The cell membranes of JS32 and a resistant clinical isolate (HB32) were observed to be smoother than those of JS0135. From the comparative gene expression profile 349 up- and 113 downregulated genes were observed, covering 37 GO and 63 KEGG pathways which are involved in biological processes (11), cellular components (17), molecular function (9), cellular processes (1), environmental information processing (4), genetic information processing (9) and metabolism (49) affected in JS32...
August 8, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28783004/sorption-behavior-of-eu-iii-from-an-aqueous-solution-onto-modified-hydroxyapatite-kinetics-modeling-and-thermodynamics
#8
H M H Gad, M A Youssef
Nano-pore hydroxyapatite (HAP) was prepared using physical activation of raw and chemically modified [using Acid; HNO3 (HAPA) or Base; NaOH (HAPB)] bone char (BC) by heating at 900°C for 1 hr to obtain HAP9, HAPA9 and HAPB9, respectively. Investigation the effects of thermal and chemical treatment of prepared nano-hydroxyapatite on elemental analysis, FTIR, scanning electron microscopy, surface area and consequently, the sorption behavior of Eu (III) ions onto the prepared nano-pore hydroxyapatite. Batch adsorption technique was used and the obtained results revealed that the optimum pH = 5...
August 16, 2017: Environmental Technology
https://www.readbyqxmd.com/read/28778053/release-behavior-and-signaling-effect-of-vitamin-d3-in-layered-double-hydroxides-hydroxyapatite-gelatin-bone-tissue-engineering-scaffold-an-in-vitro-evaluation
#9
Fateme Fayyazbakhsh, Mehran Solati-Hashjin, Abbas Keshtkar, Mohammad Ali Shokrgozar, Mohammad Mehdi Dehghan, Bagher Larijani
Incorporating the controlled release of vitamin D3 (VD3) into biodegradable porous scaffolds is a new approach to equipping multifunctional therapeutics for osteoporosis. The current investigation involves the encapsulation of VD3 into gelatin through the one-step desolvation method. The layered double hydroxides-hydroxyapatite nanocomposite (LDH-HAp) and pure LDH were combined with the gelatin-VD3 complex to reinforce the porous biodegradable structure and enhance the biological response. Afterwards, glutaraldehyde was used to form crosslinks within the gelatin chains...
July 3, 2017: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/28777746/characterization-of-breast-calcification-types-using-dual-energy-x-ray-method
#10
Niki Martini, Vaia Koukou, George Fountos, Christos Michail, Athanasios Bakas, Ioannis S Kandarakis, Robert David Speller, George C Nikiforidis
Calcifications are products of mineralization whose presence is usually associated with pathological conditions. The minerals mostly seen in several diseases are calcium oxalate (CaC2O4), calcium carbonate (CaCO3) and hydroxyapatite (HAp). Up to date, there is no in-vivo method that could discriminate between minerals. To this aim, a dual energy X-ray method was developed in the present study. An analytical model was implemented for the determination of the Calcium/Phosphorus mass ratio (mca/mp ). The simulation was carried out using monoenergetic and polyenergetic X-rays and various calcification thicknesses (100 to 1000 um) and types (CaC2O4, CaCO3, HAp)...
August 4, 2017: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/28774805/organically-modified-clay-supported-chitosan-hydroxyapatite-zinc-oxide-nanocomposites-with-enhanced-mechanical-and-biological-properties-for-the-application-in-bone-tissue-engineering
#11
Arundhati Bhowmick, Sovan Lal Banerjee, Nilkamal Pramanik, Piyali Jana, Tapas Mitra, Arumugam Gnanamani, Manas Das, Patit Paban Kundu
The objective of this study is to design biomimetic organically modified montmorillonite clay (OMMT) supported chitosan/hydroxyapatite-zinc oxide (CTS/HAP-ZnO) nanocomposites (ZnCMH I-III) with improved mechanical and biological properties compared to previously reported CTS/OMMT/HAP composite. Fourier transform infrared spectroscopy, powder X-ray diffraction, scanning electron microscopy and transmission electron microscopy were used to analyze the composition and surface morphology of the prepared nanocomposites...
July 31, 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/28774058/characterization-and-bioactivity-evaluation-of-polyetheretherketone-polyglycolicacid-hydroyapatite-scaffolds-for-tissue-regeneration
#12
Cijun Shuai, Chenying Shuai, Ping Wu, Fulai Yuan, Pei Feng, Youwen Yang, Wang Guo, Xiaohan Fan, Ting Su, Shuping Peng, Chengde Gao
Bioactivity and biocompatibility are crucial for tissue engineering scaffolds. In this study, hydroxyapatite (HAP) was incorporated into polyetheretherketone/polyglycolicacid (PEEK/PGA) hybrid to improve its biological properties, and the composite scaffolds were developed via selective laser sintering (SLS). The effects of HAP on physical and chemical properties of the composite scaffolds were investigated. The results demonstrated that HAP particles were distributed evenly in PEEK/PGA matrix when its content was no more than 10 wt %...
November 18, 2016: Materials
https://www.readbyqxmd.com/read/28773899/evaluation-of-the-antimicrobial-activity-of-different-antibiotics-enhanced-with-silver-doped-hydroxyapatite-thin-films
#13
Daniela Predoi, Cristina Liana Popa, Patrick Chapon, Andreea Groza, Simona Liliana Iconaru
The inhibitory and antimicrobial effects of silver particles have been known since ancient times. In the last few years, a major health problem has arisen due to pathogenic bacteria resistance to antimicrobial agents. The antibacterial activities of new materials including hydroxyapatite (HAp), silver-doped hydroxyapatite (Ag:HAp) and various types of antibiotics such as tetracycline (T-HAp and T-Ag:HAp) or ciprofloxacin (C-HAp and C-Ag:HAp) have not been studied so far. In this study we reported, for the first time, the preparation and characterization of various thin films based on hydroxyapatite and silver-doped hydroxyapatite combined with tetracycline or ciprofloxacin...
September 16, 2016: Materials
https://www.readbyqxmd.com/read/28773116/zirconia-hydroxyapatite-composites-synthesized-via-sol-gel-influence-of-hydroxyapatite-content-and-heating-on-their-biological-properties
#14
Flavia Bollino, Emilia Armenia, Elisabetta Tranquillo
Zirconia (ZrO₂) and zirconia-based glasses and ceramics are materials proposed for use in the dental and orthopedic fields. In this work, ZrO₂ glass was modified by adding different amounts of bioactive and biocompatible hydroxyapatite (HAp). ZrO₂/HAp composites were synthesized via the sol-gel method and heated to different temperatures to induce modifications of their chemical structure, as ascertained by Fourier transform infrared spectroscopy (FTIR) analysis. The aim was to investigate the effect of both HAp content and heating on the biological performances of ZrO₂...
July 5, 2017: Materials
https://www.readbyqxmd.com/read/28773041/ultrasonic-measurements-on-%C3%AE-cyclodextrin-hydroxyapatite-composites-for-potential-water-depollution
#15
Daniela Predoi, Mihai Valentin Predoi, Simona Liliana Iconaru, Moncef Ech Cherif El Kettani, Damien Leduc, Alina Mihaela Prodan
This paper presents structural, morphological and preliminary ultrasonic characterizations of the β-Cyclodextrin/hydroxyapatite (CD-HAp) composites synthesized by an adapted co-precipitation method. The structural and morphological properties were evaluated by Scanning Electron Microscopy (SEM) and Energy Dispersive X-ray Spectroscopy (EDX). The specific surface area, pore size and pore volume were determined using the methods of Brunauer-Emmett-Teller (BET) and Barrett-Joyner-Halenda (BJH), respectively. The novelty of our study consists in preliminary ultrasonic measurements conducted on CD-HAp composite, uniformly dispersed in distilled water...
June 21, 2017: Materials
https://www.readbyqxmd.com/read/28772874/macroporous-calcium-phosphate-chitosan-composites-prepared-via-unidirectional-ice-segregation-and-subsequent-freeze-drying
#16
Inmaculada Aranaz, Enrique Martínez-Campos, Carolina Moreno-Vicente, Ana Civantos, Sara García-Arguelles, Francisco Del Monte
Calcium phosphate chitosan-based composites have gained much interest in recent years for biomedical purposes. In this paper, three-dimensional calcium phosphate chitosan-based composites with different mineral contents were produced using a green method called ice segregation induced self-assembly (ISISA). In this methodology, ice crystals were used as a template to produce porous structures from an aqueous solution of chitosan (CS) and hydroxyapatite (Hap) also containing acetic acid (pH = 4.5). For better characterization of the nature of the inorganic matter entrapped within the resulting composite, we performed either oxygen plasma or calcination processes to remove the organic matter...
May 8, 2017: Materials
https://www.readbyqxmd.com/read/28772589/textural-structural-and-biological-evaluation-of-hydroxyapatite-doped-with-zinc-at-low-concentrations
#17
Daniela Predoi, Simona Liliana Iconaru, Aurélien Deniaud, Mireille Chevallet, Isabelle Michaud-Soret, Nicolas Buton, Alina Mihaela Prodan
The present work was focused on the synthesis and characterization of hydroxyapatite doped with low concentrations of zinc (Zn:HAp) (0.01 < xZn < 0.05). The incorporation of low concentrations of Zn(2+) ions in the hydroxyapatite (HAp) structure was achieved by co-precipitation method. The physico-chemical properties of the samples were characterized by X-ray Diffraction (XRD), Fourier Transform Infrared Spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS), Scanning Electron Microscopy (SEM), zeta-potential, and DLS and N₂-BET measurements...
February 25, 2017: Materials
https://www.readbyqxmd.com/read/28772455/biocompatibility-and-corrosion-protection-behaviour-of-hydroxyapatite-sol-gel-derived-coatings-on-ti6al4v-alloy
#18
Amir A El Hadad, Eduardo Peón, Federico R García-Galván, Violeta Barranco, Juan Parra, Antonia Jiménez-Morales, Juan Carlos Galván
The aim of this work was to prepare hydroxyapatite coatings (HAp) by a sol-gel method on Ti6Al4V alloy and to study the bioactivity, biocompatibility and corrosion protection behaviour of these coatings in presence of simulated body fluids (SBFs). Thermogravimetric/Differential Thermal Analyses (TG/DTA) and X-ray Diffraction (XRD) have been applied to obtain information about the phase transformations, mass loss, identification of the phases developed, crystallite size and degree of crystallinity of the obtained HAp powders...
January 24, 2017: Materials
https://www.readbyqxmd.com/read/28772452/first-row-transition-metal-doping-in-calcium-phosphate-bioceramics-a-detailed-crystallographic-study
#19
Guillaume Renaudin, Sandrine Gomes, Jean-Marie Nedelec
Doped calcium phosphate bioceramics are promising materials for bone repair surgery because of their chemical resemblance to the mineral constituent of bone. Among these materials, BCP samples composed of hydroxyapatite (Ca10(PO₄)₆(OH)₂) and β-TCP (Ca₃(PO₄)₂) present a mineral analogy with the nano-multi-substituted hydroxyapatite bio-mineral part of bones. At the same time, doping can be used to tune the biological properties of these ceramics. This paper presents a general overview of the doping mechanisms of BCP samples using cations from the first-row transition metals (from manganese to zinc), with respect to the applied sintering temperature...
January 23, 2017: Materials
https://www.readbyqxmd.com/read/28772390/physico-chemical-in-vitro-and-in-vivo-evaluation-of-a-3d-unidirectional-porous-hydroxyapatite-scaffold-for-bone-regeneration
#20
Manabu Tanaka, Hisao Haniu, Takayuki Kamanaka, Takashi Takizawa, Atsushi Sobajima, Kazushige Yoshida, Kaoru Aoki, Masanori Okamoto, Hiroyuki Kato, Naoto Saito
The unidirectional porous hydroxyapatite HAp (UDPHAp) is a scaffold with continuous communicated pore structure in the axial direction. We evaluated and compared the ability of the UDPHAp as a three-dimensional (3D) bone tissue engineering scaffold to the interconnected calcium porous HAp ceramic (IP-CHA). To achieve this, we evaluated in vitro the compressive strength, controlled rhBMP-2 release behavior, adherent cell morphology, cell adhesion manner, and cell attachment of UDPHAp. As a further in vivo experiment, UDPHAp and IP-CHA with rhBMP-2 were transplanted into mouse calvarial defects to evaluate their bone-forming ability...
January 3, 2017: Materials
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