In this paper we study a generalized Klausmeier model replacing the integer derivative by a local fractional derivative. This derivative enables us to consider a wide range of systems with already well-known derivatives. We analyze the stability of this new model as well as the homotopic perturbation method. Finally, an inverse problem associated with a real data set is solved.
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http://dx.doi.org/10.3934/mbe.2023734 | DOI Listing |
bioRxiv
October 2024
Department of Biomedical Engineering, University of Wisconsin-Madison; Madison, WI 53706, USA.
Population cycles are prevalent in ecosystems and play key roles in determining their functions. While multiple mechanisms have been theoretically shown to generate population cycles, there are limited examples of mutualisms driving self-sustained oscillations. Using an engineered microbial community that cross-feeds essential amino acids, we experimentally demonstrate cycles in strain abundance that are robust across environmental conditions.
View Article and Find Full Text PDFJ Allergy Clin Immunol Pract
November 2024
Department of Pediatrics, Stanford University School of Medicine, Stanford, Calif.
Background: After introducing IL-1/IL-6 inhibitors, some patients with Still and Still-like disease developed unusual, often fatal, pulmonary disease. This complication was associated with scoring as DReSS (drug reaction with eosinophilia and systemic symptoms) implicating these inhibitors, although DReSS can be difficult to recognize in the setting of systemic inflammatory disease.
Objective: To facilitate recognition of IL-1/IL-6 inhibitor-DReSS in systemic inflammatory illnesses (Still/Still-like) by looking at timing and reaction-associated features.
J R Soc Interface
May 2024
Department of Global Ecology, Carnegie Institution for Science , Stanford, CA, USA.
Simple models have been used to describe ecological processes for over a century. However, the complexity of ecological systems makes simple models subject to modelling bias due to simplifying assumptions or unaccounted factors, limiting their predictive power. Neural ordinary differential equations (NODEs) have surged as a machine-learning algorithm that preserves the dynamic nature of the data (Chen 2018 ).
View Article and Find Full Text PDFMath Biosci Eng
August 2023
Faculty of Mathematics, Autonomous University of Guerrero, Mexico.
In this paper we study a generalized Klausmeier model replacing the integer derivative by a local fractional derivative. This derivative enables us to consider a wide range of systems with already well-known derivatives. We analyze the stability of this new model as well as the homotopic perturbation method.
View Article and Find Full Text PDFProc Biol Sci
April 2023
Ecology, Evolution, and Behavior Program, Michigan State University, East Lansing, MI, USA.
Climate warming is altering life cycles of ectotherms by advancing phenology and decreasing generation times. Theoretical models provide powerful tools to investigate these effects of climate warming on consumer-resource population dynamics. Yet, existing theory primarily considers organisms with simplified life histories in constant temperature environments, making it difficult to predict how warming will affect organisms with complex life cycles in seasonal environments.
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