Examinando por Autor "Fernández-Ossa, C. E. (Carlos Eduardo)"

Mostrando 1 - 2 de 2
  • Miniatura
    PublicaciónAcceso abierto
    Influencia de la vegetación en los niveles de ruido urbano
    (2013-11-26) Posada-Posada, M. I. (Martha Isabel); Arroyave-Maya, M. P. (Maria del Pilar); Fernández-Ossa, C. E. (Carlos Eduardo)
    The objective of the study was to assess the capacity of vegetation to reduce the noise in the Aburrá valley. The methodology comprised two phases: the first was the revision of secondary information related to the role of vegetation and to obtain the conceptual bases for further experimental development. The second phase was the measurement of noise levels 10 m from the sound source (high traffic road) in urban public green zones with different plant coverage (tree, shrub, and a mixture of trees and shrubs) and without vegetation. Results showed no significant differences between the sites with and without vegetation, allowing us to infer that under conditions of the study, characterized by having few individuals of trees and shrubs dispersed, the vegetation does not play a significant role in reducing noise. Therefore, for its control in urban areas measures other than the planting of trees must be taken, or wider, longer, denser, and higher live barriers should be established.
  • Miniatura
    PublicaciónAcceso abierto
    Producción de biomasa y exopolisacáridos de grifola frondosa bajo cultivo sumergido utilizando fuentes de carbono no convencionales
    (2014-05-08) Zapata-Ocampo, P. A. (Paola Andrea); Rojas-Vahos, D. F. (Diego Fernando); Fernández-Ossa, C. E. (Carlos Eduardo); Ramirez-Cadavid, D. A. (David Alexander); Restrepo, G. (Gloria); Orjuela, V. (Viviana); Arroyave, M. (Marcela); Gómez, T. (Tatiana); Atehortúa-Garcés, L. (Lucia)
    Grifola frondosa is a Basidiomycete fungus edible and medicinal, it produces polysaccharides such a glucans (β-1,6 and β-1,3) with anti-tumor and inmuno-stimulating activity. For this work, the aim was evaluate the incidence of different carbon sources (FC) in biomass and exo-polymer (EPS) production, under submerged culture conditions, by using a factorial statistical design with two factors: carbon source (FC(1-7)) and medium (MB and MS). The maximal yield of mycelial biomass (21,10 ± 0,82) g/l and the maximal yield in EPS (6,53 ± 0,14) g/l was achieved by using the MB medium supplemented with FC4. Besides, it was possible to develop a medium that fulfills the objective of reducing costs from $18.455 to $656 Colombian pesos for each liter of medium used, which produces (14,14 ± 0,82) g/l of biomass and (5,16 ± 0,14) g/l of EPS, using the MS medium supplemented with FC4. This result opens new alternatives and possibilities in our country for developing products of this species with cost that can be reached by population.