Browsing by Author "Ortiz, M."

Now showing 1 - 8 of 8
  • No Thumbnail Available
    Item
    Adaptation and validation of the Perceived Economic Inequality in Everyday Life (PEIEL) scale in Chilean adults
    (Springer, 2024) Rodríguez González, Laura Cristina; Repetto Lisboa, Paula Beatriz; Ortiz, M.; Schleef, J.
    The Perceived Economic Inequality in Everyday Life (PEIEL) scale was developed in Spain within the context of political and social psychology research. This study introduces an abbreviated version of the scale for potential application in health research among the Chilean population. This study examined the psychometric properties of the proposed adaptation and assessed its metric invariance across lower and higher income groups in a sample of Chilean adults aged 50 and older (n = 372 respondents; 64.1% women; mean age ± SD = 58.8 ± 5.2). Four experts reviewed the original scale items to create a shortened version, selecting those that effectively capture economic inequality in the Chilean context. Confirmatory factor analysis was employed to validate the proposed factorial structure and assess invariance. The results support the proposed factorial structure and establish scalar invariance, which indicates the instrument’s consistent measurement properties across income levels.
  • Thumbnail Image
    Item
    Cutaneous Manifestations in Renal Transplant Recipients of Santiago, Chile
    (ELSEVIER SCIENCE INC, 2009) Sandoval, M.; Ortiz, M.; Diaz, C.; Majerson, D.; Molgo, M.
    Introduction. Renal transplant recipients have a heightened risk of developing various cutaneous manifestations, such as skin infections, skin cancer, and secondary effects of immunosuppressive drugs. These manifestations differ depending on the evaluated population. The objective of this study was to describe the prevalence of cutaneous manifestations among renal transplant recipients in Chile between 1979 and 2008.
  • Thumbnail Image
    Item
    Estructura factorial de la escala DREEM en estudiantes de medicina chilenos
    (2015) Ortega, B.; Perez, V.; Ortiz, M.; Fasce, H.; Mccoll, C.; Torres, A.; Wright Navarrete, Ana Cecilia; Marquez, U.; Parra, P.
  • No Thumbnail Available
    Item
  • No Thumbnail Available
    Item
    Fuzzy Inference System for Predicting Functional Service Life of Concrete Pavements in Airports
    (2022) Prieto, A. J.; Guinez, F.; Ortiz, M.; Gonzalez, M.
    Concerning one of the most important tasks of road structure management is the development of methods to predict their own functional or physical service life, which allows for objectively evaluating the state of road structures that are being considered or are already in operation with minimal labor and monetary incomes. Fuzzy logic systems constitute one successful methodology used for the valuation of pavement degradation. The clustering that focuses on pavement degradation conditions is normally performed by a visual inspection or using data collected by automated distress measurement equipment. Fuzzy sets theory provides different advantages for including a certain degree of uncertainty in the pavement performance index, subjective analysis, and maintenance assessments and can greatly improve consistency and reduce subjectivity in the degradation process. The main objective of this study was to develop a new fuzzy logic-based model to predict the functional service life of concrete pavement conditions and maintenance action evaluations concerning the airport network of Vina del Mar, Central Chile, and using pavement distress data from the Directorate of Airports, Ministry of Public Works of Chile. The proposed fuzzy logic model can be remarkably beneficial for design, construction, and maintenance, to evaluate design decisions for the measurable and objective valuation of deviations in the quality of construction, and for timely forecasting work based on continuous observing of the current infrastructure system.
  • Thumbnail Image
    Item
    Iron oxide nanoparticles (IONPs) with potential applications in plasmid DNA isolation
    (2018) Sosa Acosta, José Raúl; Silva, J.A.; Fernández Izquierdo, Leunam; Díaz Castañón, S.; Ortiz, M.; Zuaznabar Gardon, J.C.; Díaz García, A.M.
  • No Thumbnail Available
    Item
    Soil fungal diversity and assembly along a xeric stress gradient in the central Namib Desert
    (2023) Vikram, S.; Ramond, J. -B.; Ortiz, M.; Maggs-Kolling, G.; Pelser, K.; Cowan, D. A.
    The Namib Desert of south-western Africa is one of the oldest deserts in the world and possesses unique geographical, biological and climatic features. While research through the last decade has generated a comprehensive survey of the prokaryotic communities in Namib Desert soils, little is yet known about the diversity and function of edaphic fungal communities, and even less of their responses to aridity. In this study, we have characterized soil fungal community diversity across the longitudinal xeric gradient across the Namib desert (for convenience, divided into the western fog zone, the central low-rainfall zone and the eastern high-rainfall zone), using internal transcribed sequence (ITS) metabarcoding. Ascomycota, Basidiomycota and Chytridiomycota consistently dominated the Namib Desert edaphic fungal communities and a core mycobiome composed of only 15 taxa, dominated by members of the class Dothideomycetes (Ascomycota), was identified. However, fungal community structures were significantly different in the fog, low-rainfall and high-rainfall zones. Furthermore, Namib Desert gravel plain fungal community assembly was driven by both deterministic and stochastic processes; the latter dominating in the all three xeric zones. We also present data that suggest that the inland limit of fog penetration represents an ecological barrier to fungal dispersal across the Namib Desert. (c) 2023 The Authors. Published by Elsevier Ltd on behalf of British Mycological Society. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).
  • Thumbnail Image
    Item