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Assessing Transfer Entropy in cardiovascular and respiratory time series: A VARFI approach
2021
In the study of complex biomedical systems represented by multivariate stochastic processes, such as the cardiovascular and respiratory systems, an issue of great relevance is the description of the system dynamics spanning multiple temporal scales. Recently, the quantification of multiscale complexity based on linear parametric models, incorporating autoregressive coefficients and fractional integration, encompassing short term dynamics and long-range correlations, was extended to multivariate time series. Within this Vector AutoRegressive Fractionally Integrated (VARFI) framework formalized for Gaussian processes, in this work we propose to estimate the Transfer Entropy, or equivalently G…
Vecuma ietekme uz Farnsworth D15 testa rezultātiem
2020
Bakalaura darbs ir uzrakstīts latviešu valodā uz 28 lapām. Tajā ir 24 attēli, 4 tabulas, 27 literatūras avoti. Darba mērķis: noskaidrot, vai izmantojot matemātisko modeli var paredzēt krāsu kauliņu sakārtošanas secības dažādu vecumu grupu pārstāvjiem bez krāsu redzes deficītiem. Metode: darbojoties ar matemātisko modeli, tika mainīts cilvēka vecums un noteikts krāsu kauliņu sakārtošanas secība Farnsworth D-15 testam. Rezultāti: matemātiskais modelis piefiksēja pirmas izmaiņas krāsu kauliņu sakārtošanas secībā 110 gadus vecam cilvēkam un konfūzijas lēņķis Vingrys & KingSmith metodē, kas ir vienāds ar -48,31°, norāda uz tritānam līdzīgo deficītu. Secinājumi: izmantojot matemātisko modeli var …
Vecāku atbildība pamatskolas izglītībā Latvijā
2022
Maģistra darba tēma: “Vecāku atbildība pamatskolas izglītībā” šobrīd ir ļoti aktuāla problēma, ievērojot skolēnu nepiemēroto rīcību mācību iestādēs. Pedagogi bieži sūdzas par emocionālo un fizisko vardarbību no skolēnu un vecāku puses. Presē aizvien biežāk tiek atspoguļoti starpgadījumi, kuros skolotāji cietuši no vardarbības. Maģistra darba pētījuma jautājums: kāda ir vecāku atbildība pamatskolas izglītībā Latvijā. Lai rastu atbildes uz šo jautājumu, tika veikta anketēšana, kuru analizējot tās tika meklētas. Vecāku atbildība ir subjektīvs jēdziens, kura nozīme katrai izglītības iestādei var atšķirties, gan atbilstoši izstrādātajiem skolas iekšējiem normatīvajiem aktiem, gan atkarībā no izg…
Model organisms and their application in environmental epigenetics
2020
Abstract Epigenetic mechanisms operate at the interface between the environment and the genome of a given organism. More particularly, they convert environmental stimuli as diverse as chemical pollutants, nutritional components, temperature changes, and social conditions into changes in the chromatin landscape, which influence gene expression in the absence of alterations in the DNA sequence, ultimately leading to phenotype adaptation and diversification. The use of experimental model organisms in epigenetics research allows for the careful manipulation of environmental factors in order to understand how they mechanistically modulate the establishment, maintenance, and inheritance of epigen…
Author Correction: Evaluation of three methods for biomass estimation in small invertebrates, using three large disparate parasite species as model o…
2018
Invertebrate biomass is considered one of the main factors driving processes in ecosystems. It can be measured directly, primarily by weighing individuals, but more often indirect estimators are used. We developed two indirect and non-destructive approaches to estimate biomass of small invertebrates in a simple manner. The first one was based on clay modelling and the second one was based on image analysis implemented with open-source software. Furthermore, we tested the accuracy of the widely used geometric approximation method (third method). We applied these three different methods to three morphologically disparate model species, an acanthocephalan worm, a crustacean and a flatworm. To …
The Developmental Transcriptome for Lytechinus variegatus Exhibits Temporally Punctuated Gene Expression Changes
2019
AbstractEmbryonic development is arguably the most complex process an organism undergoes during its lifetime, and understanding this complexity is best approached with a systems-level perspective. The sea urchin has become a highly valuable model organism for understanding developmental specification, morphogenesis, and evolution. As a non-chordate deuterostome, the sea urchin occupies an important evolutionary niche between protostomes and vertebrates.Lytechinus variegatus(Lv) is an Atlantic species that has been well studied, and which has provided important insights into signal transduction, patterning, and morphogenetic changes during embryonic and larval development. The Pacific specie…
CYGD: the Comprehensive Yeast Genome Database.
2005
The comprehensive resource is available under http://mips.gsf.de/genre/proj/yeast/.; International audience; The Comprehensive Yeast Genome Database (CYGD) compiles a comprehensive data resource for information on the cellular functions of the yeast Saccharomyces cerevisiae and related species, chosen as the best understood model organism for eukaryotes. The database serves as a common resource generated by a European consortium, going beyond the provision of sequence information and functional annotations on individual genes and proteins. In addition, it provides information on the physical and functional interactions among proteins as well as other genetic elements. These cellular network…
Vegetation Patterns in the Hyperbolic Klausmeier Model with Secondary Seed Dispersal
2023
This work focuses on the dynamics of vegetation stripes in sloped semi-arid environments in the presence of secondary seed dispersal and inertial effects. To this aim, a hyperbolic generalization of the Klausmeier model that encloses the advective downhill transport of plant biomass is taken into account. Analytical investigations were performed to deduce the wave and Turing instability loci at which oscillatory and stationary vegetation patterns arise, respectively. Additional information on the possibility of predicting a null-migrating behavior was extracted with suitable approximations of the dispersion relation. Numerical simulations were also carried out to corroborate theoretical pre…
Numerical Simulations of the Flow Field of a Submerged Hydraulic Jump over Triangular Macroroughnesses
2021
The submerged hydraulic jump is a sudden change from the supercritical to subcritical flow, specified by strong turbulence, air entrainment and energy loss. Despite recent studies, hydraulic jump characteristics in smooth and rough beds, the turbulence, the mean velocity and the flow patterns in the cavity region of a submerged hydraulic jump in the rough beds, especially in the case of triangular macroroughnesses, are not completely understood. The objective of this paper was to numerically investigate via the FLOW-3D model the effects of triangular macroroughnesses on the characteristics of submerged jump, including the longitudinal profile of streamlines, flow patterns in the cavity regi…
Seguridad y ciudadanía en la España democrática. La Policía de Proximidad como ética aplicada
2018
El presente trabajo tiene carácter descriptivo y es consecuencia de años de servicio en políticas públicas de seguridad; esta experiencia personal ha pasado por el tamiz de la reflexión ética, y al escribirla hemos pretendido reconstruir esa experiencia de trabajo desde la perspectiva de una ética cívica. Esta voluntad de reconstrucción supone en cierto modo una “justicia reparadora” con los verdaderos protagonistas de esta historia: policías y vecinos, todos ciudadanos en un mismo escenario, la España constitucional, que han trabajado por la seguridad ciudadana y la libertad. La reconstrucción reflexiva de estas experiencias era una obligación implícita que debía ser cumplida. No podía dej…