Hydroxylapatite
Mostrando 1-12 de 239 artigos, teses e dissertações.
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1. Repair of Surgical Bone Defects Grafted with Hydroxylapatite + β-TCP and Irradiated with λ=850 nm LED Light
O tratamento de perdas ósseas devido a diferentes fatores etiológicos é difícil e muitas técnicas têm por objetivo melhorar o reparo incluindo o uso de uma ampla gama de biomateriais e, recentemente, a fotobioengenharia. Este trabalho teve como objetivo avaliar, por meio de análise histológica, o reparo de
Braz. Dent. J.. Publicado em: 2015-02
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2. SÍNTESE E CARACTERIZAÇÃO DE NANOCOMPÓSITOS HIDROXIAPATITAGELATINA OBTIDOS PELO MÉTODO DE PRECIPITAÇÃO UTILIZANDO O MÉTODO DE RIETVELD E IVTF
Apatitas nanoestruturadas com cristalinidade e composição similar a apatita do osso têm sido amplamente investigadas nos últimos anos. Devido ao osso ser um tecido que requer algum grau de tensão mecânica para manter sua vitalidade, têm sido empregados vários biopolímeros, como o compósito HAP/Gelatina a fim de minimizar este problema. Este biomate
Publicado em: 2008
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3. Treonil-TRNA sintetase de germen de trigo : purificação e propriedades cineticas
Aminoacil - tRNA syntetases are enzymes that catalyse the first step of protein biosynthesis, the aminoacyl - tRNA formation. The substrates of the reaction are the L-aminoacid, ATP and tRNA, specific for this L-aminoacid. Magnesium ion parcipates as the cofactor of the reaction. The products of the reaction are aminoacyl - t.RNA, AMP and inorganic pyrophosp
Publicado em: 1991
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4. Energetics of the initial phase of adhesion of Streptococcus sanguis to hydroxylapatite.
The initial adhesion of Streptococcus sanguis 10556 to artificial salivary pellicle and to bare hydroxylapatite was studied at several temperatures between 18 and 37 degrees C. When the natural logarithms of rate constants for adsorption and desorption were plotted against reciprocal temperatures in Arrhenius plots, curved lines were obtained, indicating tha
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5. Assessment of the endo-1,4-beta-glucanase components of Ruminococcus flavefaciens FD-1.
The extracellular endo-1,4-beta-glucanase components of Ruminococcus flavefaciens FD-1 were analyzed by high-performance liquid chromatography (HPLC) by using DEAE ion-exchange, hydroxylapatite, and gel filtration chromatography and polyacrylamide gel electrophoresis (PAGE). Two endo-1,4-beta-glucanase peaks were resolved by DEAE-HPLC and termed endoglucanas
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6. Positive Cooperativity in the Binding of Streptococcus sanguis to Hydroxylapatite
The adherence of Streptococcus sanguis to hydroxylapatite beads has been analyzed by binding isotherms, Langmuir isotherms, and Scatchard plots. For saliva-coated beads, the Scatchard curves contained components with both positive and negative slopes. The results are interpreted as evidence for positive cooperativity in the binding process. Although all Scat
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7. Isolation and some properties of an enterotoxin produced by Bacillus cereus.
Extracellular proteins produced by Bacillus cereus B-4ac were separated by chromatography on Amberlite CG-400, QAE-Sephadex, Sephadex G-75, and hydroxylapatite. A fraction, containing three detectable antigens, obtained from chromatography on hydroxylapatite caused fluid accumulation in ligated rabbit ileal loops, was dermonecrotic to rabbit skin, was cytoto
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8. A new procedure for purifying histone pairs H2A + H2B and H3 + H4 from chromatin using hydroxylapatite.
A method to purify histone groups H2A+H2B and H3+H4 using dissociation with NaCl and hydroxylapatite chromatography is presented. The procedure is simple, involves mild solvents, and provides milligram quantities of histones of high purity. The histone pairs prepared by this method can regenerate chromatin-like characteristics when combined and reconstituted
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9. Hydrophobic interactions and the adherence of Streptococcus sanguis to hydroxylapatite.
Streptococcus sanguis demonstrated a high affinity for hydrocarbon solvents. When aqueous suspensions of the organism were mixed with either hexadecane or toluene, the cells tended to bind to the nonaqueous solvent. Increases in temperature resulted in a greater affinity of cells for hexadecane. Interaction between the cells and hexadecane was also enhanced
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10. Oestradiol-receptor complexes in subnuclear fractions of rat uterine tissue.
The subnuclear distribution of 3H-oestradiol-receptor complexes was studied in uterine tissue of ovariectomized adult rats. Nuclei were sonically disrupted and 8 different subnuclear fractions were isolated by discontinuous sucrose density gradient centrifugation. 3H-Oestradiol-receptor complexes, measured by hydroxylapatite column chromatography, were local
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11. A deoxyadenylate kinase activity associated with polynucleotide phosphorylase from Micrococcus luteus
We report here the presence of two enzymatic activities associated with highly purified preparations of polynucleotide phosphorylase from Micrococcus luteus. The first, a nuclease activity, which is not separated from the phosphorylase on hydroxylapatite, may be due to substitution of H2O for phosphate in the phosphorolysis reaction. The second ac tivity, a
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12. Isolation and partial characterization of single-stranded adenoviral DNA produced during synthesis of adenovirus type 2 DNA.
Single-stranded fragments of adenovirus type 2 DNA were isolated from infected KB cells under conditions which retarded reassociation of complementary sequences but did not denature native viral DNA. Of the total intracellular, virus-specific DNA labeled during a 1-h pulse with tritiated thymidine begining 15 h after infection, about 20% was single stranded