Base de dados : MEDLINE
Pesquisa : D01.524 [Categoria DeCS]
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  1 / 1997 MEDLINE  
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[PMID]:28985540
[Au] Autor:Wang YS; Dai JG; Wang L; Tsang DCW; Poon CS
[Ad] Endereço:Department of Civil and Environmental Engineering, The Hong Kong Polytechnic University, Hong Kong, China.
[Ti] Título:Influence of lead on stabilization/solidification by ordinary Portland cement and magnesium phosphate cement.
[So] Source:Chemosphere;190:90-96, 2018 Jan.
[Is] ISSN:1879-1298
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:Inorganic binder-based stabilization/solidification (S/S) of Pb-contaminated soil is a commonly used remediation approach. This paper investigates the influences of soluble Pb species on the hydration process of two types of inorganic binders: ordinary Portland cement (OPC) and magnesium potassium phosphate cement (MKPC). The environmental leachability, compressive strength, and setting time of the cement products are assessed as the primary performance indicators. The mechanisms of Pb involved in the hydration process are analyzed through X-ray diffraction (XRD), hydration heat evolution, and thermogravimetric analyses. Results show that the presence of Pb imposes adverse impact on the compressive strength (decreased by 30.4%) and the final setting time (prolonged by 334.7%) of OPC, but it exerts much less influence on those of MKPC. The reduced strength and delayed setting are attributed to the retarded hydration reaction rate of OPC during the induction period. These results suggest that the OPC-based S/S of soluble Pb mainly depends on physical encapsulation by calcium-silicate-hydrate (CSH) gels. In contrast, in case of MKPC-based S/S process, chemical stabilization with residual phosphate (pyromorphite and lead phosphate precipitation) and physical fixation of cementitious struvite-K are the major mechanisms. Therefore, MKPC is a more efficient and chemically stable inorganic binder for the Pb S/S process.
[Mh] Termos MeSH primário: Materiais de Construção
Chumbo/química
Compostos de Magnésio/química
Fosfatos/química
Poluentes do Solo/química
[Mh] Termos MeSH secundário: Compostos de Cálcio
Géis/química
Minerais/química
Compostos de Potássio/química
Silicatos
Poluentes Químicos da Água/química
Difração de Raios X
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Calcium Compounds); 0 (Gels); 0 (Magnesium Compounds); 0 (Minerals); 0 (Phosphates); 0 (Potassium Compounds); 0 (Silicates); 0 (Soil Pollutants); 0 (Water Pollutants, Chemical); 12190-77-1 (pyromorphite); 2P299V784P (Lead); 453COF7817 (magnesium phosphate); 62I1T06190 (lead phosphate); B7862WZ632 (potassium phosphate); S4255P4G5M (calcium silicate)
[Em] Mês de entrada:1803
[Cu] Atualização por classe:180305
[Lr] Data última revisão:
180305
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:171007
[St] Status:MEDLINE


  2 / 1997 MEDLINE  
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[PMID]:28825986
[Au] Autor:Piveteau S; Picard S; Dabert P; Daumer ML
[Ad] Endereço:Irstea, UR OPAALE, 17 Avenue de Cucillé-CS 64427, F-35044, Rennes, France; Univ de Bretagne Loire, France. Electronic address: simon.piveteau@irstea.fr.
[Ti] Título:Dissolution of particulate phosphorus in pig slurry through biological acidification: A critical step for maximum phosphorus recovery as struvite.
[So] Source:Water Res;124:693-701, 2017 Nov 01.
[Is] ISSN:1879-2448
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:Recycling phosphorus as struvite from pig slurry requires an acidification step to dissolve the inorganic solids containing most of the phosphorus. This study focused on the biological acidification of several pig slurries using sucrose as a model organic co-substrate. Lactic acid fermentation occurred systematically, dissolving 60-90% of TP (total phosphorus) and T-Mg (total magnesium) at pH 6 or lower. Optimal pH range for maximum P dissolution aimed at struvite recovery was 5.5-6. A simple model was developed correlating pH, sucrose and buffer capacity to optimize P dissolution and future recovery using real organic waste.
[Mh] Termos MeSH primário: Fósforo
Estruvita
Eliminação de Resíduos Líquidos
[Mh] Termos MeSH secundário: Animais
Compostos de Magnésio
Esterco
Fosfatos
Solubilidade
Suínos
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Magnesium Compounds); 0 (Manure); 0 (Phosphates); 27YLU75U4W (Phosphorus); AW3EJL1462 (Struvite)
[Em] Mês de entrada:1710
[Cu] Atualização por classe:171020
[Lr] Data última revisão:
171020
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170822
[St] Status:MEDLINE


  3 / 1997 MEDLINE  
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[PMID]:28768926
[Au] Autor:Shiino K; Fujinami Y; Kimura SI; Iwao Y; Noguchi S; Itai S
[Ad] Endereço:Department of Pharmaceutical Engineering, School of Pharmaceutical Sciences, University of Shizuoka.
[Ti] Título:Melt Adsorption as a Manufacturing Method for Fine Particles of Wax Matrices without Any Agglomerates.
[So] Source:Chem Pharm Bull (Tokyo);65(8):726-731, 2017.
[Is] ISSN:1347-5223
[Cp] País de publicação:Japan
[La] Idioma:eng
[Ab] Resumo:We have focused on melt adsorption as manufacture method of wax matrices to control particles size of granules more easily than melt granulation. The purpose of present study was to investigate the possibility of identifying a hydrophobic material with a low melting point, currently used as a meltable binder of melt granulation, to apply as a novel carrier in melt adsorption. Glyceryl monostearate (GM) and stearic acid (SA) were selected as candidate hydrophobic materials with low melting points. Neusilin US2 (US2), with a particle diameter of around 100 µm was selected as a surface adsorbent, while dibasic calcium phosphate dihydrate (DCPD), was used as a non-adsorbent control to prepare melting granules as a standard for comparison. We prepared granules containing ibuprofen (IBU) by melt adsorption or melt granulation and evaluated the particle size, physical properties and crystallinity of granules. Compared with melt granulation using DCPD, melt adsorption can be performed over a wide range of 14 to 70% for the ratio of molten components. Moreover, the particle size; d50 of obtained granules was 100-200 µm, and these physical properties showed good flowability and roundness. The process of melt adsorption did not affect the crystalline form of IBU. Therefore, the present study has demonstrated for the first time that melt adsorption using a hydrophobic material, GM or SA, has the potential capability to control the particle size of granules and offers the possibility of application as a novel controlled release technique.
[Mh] Termos MeSH primário: Congelamento
Glicerídeos/química
Tamanho da Partícula
Ácidos Esteáricos/química
Ceras/química
[Mh] Termos MeSH secundário: Adsorção
Compostos de Alumínio/química
Fosfatos de Cálcio/química
Ibuprofeno/química
Compostos de Magnésio/química
Silicatos/química
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Aluminum Compounds); 0 (Calcium Phosphates); 0 (Glycerides); 0 (Magnesium Compounds); 0 (Silicates); 0 (Stearic Acids); 0 (Waxes); 230OU9XXE4 (glyceryl monostearate); 4ELV7Z65AP (stearic acid); 6M3P64V0NC (aluminum magnesium silicate); WK2XYI10QM (Ibuprofen)
[Em] Mês de entrada:1708
[Cu] Atualização por classe:170829
[Lr] Data última revisão:
170829
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170804
[St] Status:MEDLINE
[do] DOI:10.1248/cpb.c17-00108


  4 / 1997 MEDLINE  
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[PMID]:28709068
[Au] Autor:Yu Y; Lei Z; Yuan T; Jiang Y; Chen N; Feng C; Shimizu K; Zhang Z
[Ad] Endereço:Graduate School of Life and Environmental Sciences, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8572, Japan.
[Ti] Título:Simultaneous phosphorus and nitrogen recovery from anaerobically digested sludge using a hybrid system coupling hydrothermal pretreatment with MAP precipitation.
[So] Source:Bioresour Technol;243:634-640, 2017 Nov.
[Is] ISSN:1873-2976
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:In order to dispose excess sewage sludge and recycle its nitrogen and phosphorus resources, hydrothermal pretreatment coupling with MgNH PO ·6H O (MAP) crystallization was investigated. Hydrothermal pretreatment at different temperature and residence time were performed on anaerobically digested sludge to maximize phosphate and ammonium release and their recovery from the resultant hydrolysate. Results showed that hydrothermal pretreatment at 200°C for 30min favored phosphate and ammonium release achieving phosphate and ammonium concentrations at 579.98mg-P/L and 456.85mg-N/L, respectively. During the subsequent MAP precipitation, the optimum condition for N and P recovery was determined at pH 9 and Mg/P molar ratio of 1, realizing P and N recovery of 91.60% and 54.88% respectively from the hydrolysate in addition to MAP purity of 84.24%. The produced MAP was confirmed by FTIR and XRD analysis, which fulfills the related standards and can be used as fertilizer with high promise.
[Mh] Termos MeSH primário: Nitrogênio
Fósforo
Esgotos
[Mh] Termos MeSH secundário: Fertilizantes
Compostos de Magnésio
Fosfatos
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Fertilizers); 0 (Magnesium Compounds); 0 (Phosphates); 0 (Sewage); 27YLU75U4W (Phosphorus); N762921K75 (Nitrogen)
[Em] Mês de entrada:1710
[Cu] Atualização por classe:171023
[Lr] Data última revisão:
171023
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170715
[St] Status:MEDLINE


  5 / 1997 MEDLINE  
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[PMID]:28668514
[Au] Autor:Manohar A; Krishnamoorthi C
[Ad] Endereço:Center for Nanotechnology Research, VIT University, Vellore 632014, Tamil Nadu, India.
[Ti] Título:Photocatalytic study and superparamagnetic nature of Zn-doped MgFe O colloidal size nanocrystals prepared by solvothermal reflux method.
[So] Source:J Photochem Photobiol B;173:456-465, 2017 Aug.
[Is] ISSN:1873-2682
[Cp] País de publicação:Switzerland
[La] Idioma:eng
[Ab] Resumo:Biocompatible Mg Zn Fe O (x=0.2, 0.4, 0.5, 0.6 & 0.8) nanoparticles were synthesized by solvothermal reflux method. All compounds were crystallized in cubic spinel structure with slightly enhance of lattice parameter with biocompatible substituent Zn concentration. All compounds were shown spherical geometry with average particle diameter is around 12nm (colloidal size). The spinel structure formation was confirmed by X-ray diffraction,electron diffraction, infrared, Raman shift measurements. Infrared analysis shows oleic acid coating on the surface of nanoparticles and TGA analysis shows that oleic acid desorbs from nanoparticle by decomposition at around 400°C. UV-Vis-NIR spectra show all the compounds show energy band gap in the semiconductor range (≈ 1.9eV). All compounds show superparamagnetic characteristics at room temperature with enhanced saturated mass magnetization (M ) with Zn concentration up to x=0.5 and then reduces with further enhance of x up to 0.8. The M changes were ascribed to occupation of Zn at tetrahedral sites and proportional enhance of Fe at octahedral sites. The enhanced Fe concentration at octahedral sublattice leads to formation Fe -O -Fe networks which favor antiferromagnetic interactions due to superexchange phenomenon. Photocatalytic activity of all compounds were studied through methylene blue (MB) degradation analysis. All compounds show ≈ 96% degradation of MB upon 70min irradiation of light on photoreactor vessel. In addition, photocatalytic activity (degradation efficiency) enhances with Zn concentration in MgFe O . The Zn substitution enhances both M and photocatalytic activity biocompatible of MgFe O nanoparticles.
[Mh] Termos MeSH primário: Compostos Férricos/química
Compostos de Magnésio/química
Nanopartículas de Magnetita/química
Zinco/química
[Mh] Termos MeSH secundário: Materiais Biocompatíveis/química
Catálise
Temperatura Alta
Nanopartículas de Magnetita/ultraestrutura
Azul de Metileno/química
Microscopia Eletrônica de Varredura
Ácido Oleico/química
Tamanho da Partícula
Fotólise/efeitos da radiação
Espectrofotometria
Espectroscopia de Infravermelho com Transformada de Fourier
Análise Espectral Raman
Termogravimetria
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Biocompatible Materials); 0 (Ferric Compounds); 0 (Magnesium Compounds); 0 (Magnetite Nanoparticles); 12068-86-9 (magnesium ferrite); 2UMI9U37CP (Oleic Acid); J41CSQ7QDS (Zinc); T42P99266K (Methylene Blue)
[Em] Mês de entrada:1710
[Cu] Atualização por classe:171010
[Lr] Data última revisão:
171010
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170703
[St] Status:MEDLINE


  6 / 1997 MEDLINE  
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[PMID]:28521226
[Au] Autor:Munir MT; Li B; Boiarkina I; Baroutian S; Yu W; Young BR
[Ad] Endereço:Department of Chemical & Materials Engineering, Faculty of Engineering, The University of Auckland, Private Bag 92019, Auckland, New Zealand.
[Ti] Título:Phosphate recovery from hydrothermally treated sewage sludge using struvite precipitation.
[So] Source:Bioresour Technol;239:171-179, 2017 Sep.
[Is] ISSN:1873-2976
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:New technologies are needed to recover phosphate from organic wastes, such as sewage sludge. Sewage sludge can be hydrothermally treated to make it safe but this process is expensive. Recovering a valuable by-product, such as phosphate, could improve the economics of hydrothermal treatment. Therefore, the technical and preliminary differential cost analysis of combining hydrothermal treatment with phosphate recovery (by precipitation of magnesium ammonium phosphate (struvite)) was investigated. The effects of pH, magnesium ion dose, and either wet oxidation or thermal hydrolysis hydrothermal treatment were examined. Phosphate recovery was more sensitive to pH than magnesium ion concentration, with diminishing rates of recovery at high levels of both. Also, more struvite was recovered following wet oxidation treatment than thermal hydrolysis. Preliminary differential cost analysis showed that wet oxidation combined with precipitation at an optimal pH and magnesium ion dose could generate revenue.
[Mh] Termos MeSH primário: Esgotos
Estruvita
Eliminação de Resíduos Líquidos
[Mh] Termos MeSH secundário: Precipitação Química
Hidrólise
Compostos de Magnésio
Fosfatos
Fósforo
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Magnesium Compounds); 0 (Phosphates); 0 (Sewage); 27YLU75U4W (Phosphorus); AW3EJL1462 (Struvite)
[Em] Mês de entrada:1711
[Cu] Atualização por classe:171106
[Lr] Data última revisão:
171106
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170519
[St] Status:MEDLINE


  7 / 1997 MEDLINE  
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[PMID]:28498132
[Au] Autor:Tong X; Yang Z; Xu P; Li Y; Niu X
[Ad] Endereço:School of Environment and Energy, South China University of Technology, Guangzhou 510006, China E-mail: zqyang@scut.edu.cn.
[Ti] Título:Nitrate adsorption from aqueous solutions by calcined ternary Mg-Al-Fe hydrotalcite.
[So] Source:Water Sci Technol;75(9-10):2194-2203, 2017 May.
[Is] ISSN:0273-1223
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:Calcined ternary hydrotalcite like compounds had been synthesized by co-precipitation and calcined at 450 °C for 6 h. It had been applied into the nitrate removal from aqueous solutions. Various factors during adsorption process, such as chemical composition of adsorbents, adsorbent dosage, initial concentration of nitrate, initial pH and co-existing anions on nitrate adsorption had been investigated. It was found that 1.5 g/L CHTlcs (Mg/Al/Fe molar ratio = 3:0.1:0.9) could achieve ideal adsorption efficiency at an initial nitrate concentration of 100 mg/L. The value of pH had little effect on nitrate adsorption. The co-existing anions had the inhibitory effect on nitrate adsorption, which was in the order of PO > SO > Cl > ClO . The batch adsorption studies showed that experimental data were well described by the pseudo-second-order kinetic model and Langmuir isotherm model, and the maximum isotherm adsorption capacity was 123.305 mg/g. The adsorption of nitrate was a spontaneous exothermic process with the reduction of entropy. The proposed adsorption mechanism obtained from characterization was that CHTlcs uptake nitrate through reconstruction effect and adsorption on external surface.
[Mh] Termos MeSH primário: Compostos de Alumínio
Hidróxido de Alumínio/química
Compostos de Ferro
Compostos de Magnésio
Hidróxido de Magnésio/química
Nitratos/química
Poluentes Químicos da Água/química
[Mh] Termos MeSH secundário: Adsorção
Ânions
Concentração de Íons de Hidrogênio
Cinética
Percloratos
Soluções/química
Purificação da Água/métodos
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Aluminum Compounds); 0 (Anions); 0 (Iron Compounds); 0 (Magnesium Compounds); 0 (Nitrates); 0 (Perchlorates); 0 (Solutions); 0 (Water Pollutants, Chemical); 17432CG1KU (hydrotalcite); 5QB0T2IUN0 (Aluminum Hydroxide); NBZ3QY004S (Magnesium Hydroxide); VLA4NZX2P4 (perchlorate)
[Em] Mês de entrada:1709
[Cu] Atualização por classe:170914
[Lr] Data última revisão:
170914
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170513
[St] Status:MEDLINE
[do] DOI:10.2166/wst.2017.082


  8 / 1997 MEDLINE  
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[PMID]:28477004
[Au] Autor:Zhu D; Zhu W; Wang W; Liu X
[Ad] Endereço:Key Laboratory for Soft Chemistry and Functional Materials of Ministry of Education, Nanjing University of Science and Technology, 200 Xiaolingwei Street, Nanjing 210094, People's Republic of China.
[Ti] Título:Gold functionalised attapulgite for discrimination of hydrogen peroxide and oxidising ions.
[So] Source:IET Nanobiotechnol;11(2):200-204, 2017 Mar.
[Is] ISSN:1751-8741
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:Aiming to monitor hydrogen peroxide and oxidizing ions in aqueous circumstance, functionalized attapulgite [i.e. gold-modified attapulgite nanocomposites (Au/ATP NCs)] as peroxidase mimics were prepared by loading ß-cysteamine-capped gold nanoparticles onto attapulgite with the use of electrostatic interactions. As-prepared Au/ATP NCs were used for the detection of H O . The linear range and detection limit for H O were determined by quantitative experiments emerging excellent stability and recyclability. The peroxidase-like activity of Au/ATP NCs could be expanded for the detection of some oxidative ions (Fe and Ag ) was also been discovered. Based on the absorption spectrum and steady-state kinetics, the mechanism for peroxidase mimic reaction is investigated. This work represents the first example of multitarget detection for molecule and cations (H O , Fe and Ag ) using Au/ATP NCs as peroxidase enzyme mimics and holds a promise for future biomedical and analytical applications.
[Mh] Termos MeSH primário: Ouro/química
Peróxido de Hidrogênio/análise
Peróxido de Hidrogênio/química
Compostos de Magnésio/química
Nanopartículas Metálicas/química
Oxidantes/química
Compostos de Silício/química
[Mh] Termos MeSH secundário: Íons/análise
Íons/química
Nanopartículas Metálicas/ultraestrutura
Oxidantes/isolamento & purificação
Tamanho da Partícula
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Ions); 0 (Magnesium Compounds); 0 (Oxidants); 0 (Silicon Compounds); 7440-57-5 (Gold); BBX060AN9V (Hydrogen Peroxide); U6V729APAM (attapulgite)
[Em] Mês de entrada:1708
[Cu] Atualização por classe:170817
[Lr] Data última revisão:
170817
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170507
[St] Status:MEDLINE
[do] DOI:10.1049/iet-nbt.2016.0006


  9 / 1997 MEDLINE  
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[PMID]:28418706
[Au] Autor:Georgiou CD; Zisimopoulos D; Kalaitzopoulou E; Quinn RC
[Ad] Endereço:1 Department of Biology, University of Patras , Patras, Greece .
[Ti] Título:Radiation-Driven Formation of Reactive Oxygen Species in Oxychlorine-Containing Mars Surface Analogues.
[So] Source:Astrobiology;17(4):319-336, 2017 Apr.
[Is] ISSN:1557-8070
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:The present study demonstrates that γ-radiolyzed perchlorate-containing Mars soil salt analogues (in a CO atmosphere) generate upon H O wetting the reactive oxygen species (ROS) superoxide radical (O ), hydrogen peroxide (H O ), and hydroxyl radicals ( OH). This study also validates that analogue radiolysis forms oxychlorine species that, in turn, can UV-photolyze to OH upon UV photolysis. This investigation was made possible by the development of a new assay for inorganic-origin O and H O determination and by the modification of a previous assay for soil OH. Results show that radiolyzed Mg(ClO ) generates H O and OH; and when included as part of a mixture analogous to the salt composition of samples analyzed at the Mars Phoenix site, the analogue generated O , H O , and OH, with OH levels 150-fold higher than in the radiolyzed Mg(ClO ) samples. Radiolyzed Mars Phoenix site salt analogue that did not contain Mg(ClO ) generated only OH also at 150-fold higher concentration than Mg(ClO ) alone. Additionally, UV photolysis of the perchlorate γ radiolysis product chlorite (ClO ) generated the oxychlorine products trihalide (Cl ), chlorine dioxide (ClO ), and hypochlorite (ClO ), with the formation of OH by UV photolysis of ClO . While the generation of ROS may have contributed in part to CO production in the Viking Labeled Release (LR) experiment and O (g) release in the Viking Gas Exchange (GEx) experiment, our results indicate that they are not likely to be the major contributor to the LR and GEx results. However, due to their highly reactive nature, they are expected to play a significant role in the alteration of organics on Mars. Additionally, experiments with hypochlorite show that the thermal stability of NaClO is in the range of the thermal stability observed for thermally liable oxidant responsible for the Viking LR results. Key Words: Mars-Oxygen-Salts-Radiation-Habitability. Astrobiology 17, 319-336.
[Mh] Termos MeSH primário: Cloro/química
Radiação Cósmica
Meio Ambiente Extraterreno
Marte
Espécies Reativas de Oxigênio/química
[Mh] Termos MeSH secundário: Cloratos/química
Peróxido de Hidrogênio/química
Radical Hidroxila/química
Compostos de Magnésio/química
Fotólise
Radiólise de Impulso
Superóxidos/química
Raios Ultravioleta
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Chlorates); 0 (Magnesium Compounds); 0 (Reactive Oxygen Species); 11062-77-4 (Superoxides); 3352-57-6 (Hydroxyl Radical); 4R7X1O2820 (Chlorine); BBX060AN9V (Hydrogen Peroxide); M536P01U3N (magnesium chlorate)
[Em] Mês de entrada:1705
[Cu] Atualização por classe:170508
[Lr] Data última revisão:
170508
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170419
[St] Status:MEDLINE
[do] DOI:10.1089/ast.2016.1539


  10 / 1997 MEDLINE  
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[PMID]:28415505
[Au] Autor:Babaie E; Lin B; Bhaduri SB
[Ad] Endereço:Department of Biomedical Engineering, University of Toledo, Toledo, OH 43606, USA. Electronic address: Elham.Babaie@rockets.utoledo.edu.
[Ti] Título:A new method to produce macroporous Mg-phosphate bone growth substitutes.
[So] Source:Mater Sci Eng C Mater Biol Appl;75:602-609, 2017 Jun 01.
[Is] ISSN:1873-0191
[Cp] País de publicação:Netherlands
[La] Idioma:eng
[Ab] Resumo:This paper is a sequel to our previous effort in developing Mg-phosphate orthopedic cements using amorphous Mg-phosphate (AMP) as the precursor. In this paper, we report a new real-time in situ technique to create macroporous bone growth substitute (BGS). The method uses biodegradable Mg-particles as the porogen. As opposed to the conventional wisdom of providing corrosion protection layers to biodegradable Mg-alloys, the present method uses the fast corrosion kinetics of Mg to create macropores in real time during the setting of the cement. An aqueous solution of PVA was used as the setting solution. Using this technique, a macroporous cement containing up to 91% porosity is obtained, as determined by pycnometry. Due to formation of H gas bubbles from corrosion of Mg, the cement becomes macroporous. The pore sizes as big as 760µm were observed. The results of SBF soaking indicated change in crystallinity as confirmed via scanning electron microscopy (SEM) and X-ray diffraction (XRD). Our in vitro cytocompatibility evaluation also revealed that the macroporous bone growth substitute composed of bobierrite is cytocompatible and can improve gene expression.
[Mh] Termos MeSH primário: Ligas/química
Cimentos para Ossos/química
Substitutos Ósseos/química
Compostos de Magnésio/química
Teste de Materiais
Osteoblastos/metabolismo
Fosfatos/química
[Mh] Termos MeSH secundário: Animais
Linhagem Celular
Corrosão
Camundongos
Osteoblastos/citologia
Porosidade
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Alloys); 0 (Bone Cements); 0 (Bone Substitutes); 0 (Magnesium Compounds); 0 (Phosphates); 453COF7817 (magnesium phosphate)
[Em] Mês de entrada:1707
[Cu] Atualização por classe:170731
[Lr] Data última revisão:
170731
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170419
[St] Status:MEDLINE



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