Examinando por Autor "Echavarría-Velásquez, A. (Alejandro)"

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  • Miniatura
    PublicaciónAcceso abierto
    Características cristaloquímicas de la hidroxiapatita sintética tratada a diferentes temperaturas
    (2014-05-07) Londoño-López, M. E. (Marta Elena); Echavarría-Velásquez, A. (Alejandro); Calle, F. (Franzenith de la)
    Synthetic Hydroxyapatite (HA) is a calcium phosphate whose chemical composition is very similar to that present in human bones. This characteristic makes it biocompatible with live tissue. Due to this biocompatibility, it is possible to use HA in many medical applications. In this research, crystalochemical properties of HA obtained by different thermal treatments and put later in physiological Ringer solution, during 5 and 30 days, were followed. Conductivity measurement and analysis by spectrophotometric UV-VIS, selective ion, DRX, FTIR, and SEM showed the high dependence of crystalinity of both thermal treatment and higher solubility of the more crystalline samples. Besides, when the samples were immersed in Ringer solution, the competition between two mechanisms, dissolution and precipitation, was reveled.
  • Miniatura
    PublicaciónAcceso abierto
    Fabricación y caracterización de una matriz tridimensional de Hidroxiapatita Macroporosa para aplicación en ingeniería de tejidos óseos
    (2014-05-08) Rincón, M. (Marcela); Rodríguez, A. (Alejandra); Londoño-López, M. E. (Marta Elena); Echavarría-Velásquez, A. (Alejandro)
    Bone tissue engineering came up as a new option treatment for different kinds of illness, among them bone diseases. All this development has allowed solving multiple medical problems. The development of a hydroxyapatite scaffold for bone cells culture will be another alternative to attend several diseases that are caused on bones and that usually lead to disabilities in people. In this study synthetic hydroxyapatite was produced by a precipitation route with amonium phosphate (NH4H2PO4) and calcium nitrate (Ca(NO3)2*4H2O) as precursors.