Libros, Capítulos y Monografías - Departamento de Física.
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Examinando Libros, Capítulos y Monografías - Departamento de Física. por Autor "Parra, Oscar"
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Ítem Embargo Enlarging simple ecological models:subspecies, hidden symmetries and thei implications(Springer, 2019) Martín González, Osmel; Pérez Díaz, Noel; Cárdenas Ortiz, Rolando Pedro; Horvath, J.E.; Universidad Central "Marta Abreu" de Las Villas. Departamento de Física; Departamento de Astronomía, Instituto de Astronomía, Geofísica y Ciencias Atmosféricas (IAG), USP, Sao Paulo, Brazil; Cárdenas Ortiz, Rolando Pedro; Mochalov, Vladimir; Parra, Oscar; Martín González, OsmelSome basic principles to enlarge simple ecological models and the role of nonlinearities are discussed. The inclusion of internal groups and the new dynamic possibilities associated with this procedure are considered in the context of the logistic model. According to our results, processes like the success or extinction of a particular group without affecting the global population are not necessarily linked to the impact of environmental changes or the supremacy of a determined group or subspecies. In our case, the uniformity, the success or extinction of a particular group into a global population may be seen as the possibility to achieve or not a typical symmetry-breaking process. Such possibilities arise associated with the degree of nonlinearity contributions and the specificities of the interaction network in the model. Other elements linked with the ecological interaction, the role of symmetries and the phenomenological nature of ecological modelling are also discussed.Ítem Embargo On the quantification of habitability: current approaches(Springer, 2019) Cárdenas Ortiz, Rolando Pedro; Nodarse Zulueta, Rosmery; Pérez Díaz, Noel; Avila Alonso, Dailé; Martín González, Osmel; Universidad Central "Marta Abreu" de Las Villas. Departamento de Física; Cárdenas Ortiz, Rolando Pedro; Mochalov, Vladimir; Parra, Oscar; Martín González, OsmelIn this chapter, we outline general ideas to quantify habitability, starting with a general abiogenesis–biogenesis conceptual model. We connect this model with the approach of the astrobiological school of quantitative habitability, specifically with quantitative habitability theory, to devise habitability indexes. We present two indexes devised by us: the Aquatic Primary Habitability for photosynthesis-based ecosystems, and the Chemosynthetic Habitability Index for chemoautotrophy-based ones. As a case study, we present the application of the last one to hydrothermal vents. It is also mentioned the possibility of embedding parameters such as net primary productivity, calculated using habitability indexes, into greater ecological models with several trophic models, making a clear connection between the astrobiological and ecological approaches of quantitative habitability.Ítem Embargo Potential changes on anammox activity after Chicxulub asteroid impact(Springer, 2019) Pérez Díaz, Noel; Martín González, Osmel; Cárdenas Ortiz, Rolando Pedro; Universidad Central "Marta Abreu" de Las Villas. Departamento de Física; Cárdenas Ortiz, Rolando Pedro; Mochalov, Vladimir; Parra, Oscar; Martín González, OsmelThe activity of anammox bacteria (AA) can be estimated based on the production of N2. Known the mechanism of the catabolic reaction, three differential equations are established according to the most important substrates (NO 3 and NHþ 4 ) and the pH. The solution of this system might provide a rough estimate of the activity of the anammox, since neither inhibitory effects nor efficiency of the microorganisms is considered. Anammox can be inhibited by ocean acidification, generated by the deposition of H2SO4 and HNO3 during asteroid impact events such as Chicxulub. The magnitude of the inhibition depends on the amount and speed with which the H2SO4 is added fundamentally.