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• W76604085 abstract "In this work we aim to simulate different stages of the amoeba Dictyostelium discoideum through its social cycle. This organism has a typical life cycle in which it behaves like an Eukaryotic amoeba, feeding on bacteria and reproducing through mitosis. It is when the sources of nutrients in the environment become scarce that the social cycle begins. In this cycle the amoebae start to emit a chemical signal that will guide them to form aggregates with approximately 50 thousand amoebae. Within such aggregate the amoebae differentiate themselves to create a multicellular being in the form of a slug, which aims to transport the amoebae to a region with a higher probability of survival. In order to simulate such organism we have merged two different models to reproduce the chemical signaling among amoebae and their movement. The model chosen to describe the chemical signaling of the compound cyclic Adenosine Monophosphate 3’5’ has ben developed according to the biochemical processes and the parameters obtained experimentally. The amoebae movement is implemented through a boids model with fixed speed where the angle of movement varies according to simple rules that have proven effective in other simulations of animal groups and cellular segregation. In this thesis we show how the method used to solve the model chemical signaling is not only numerically more efficient, but also capable of reproducing several properties of the amoeba seen in experiments until the aggregation stage, including: synchronization, adaptation, spiral formation and reaction-diffusion patterns. Upon implementation of amoeba movement we verified other properties such as streaming, mound formation and collective rotational movement. In this thesis we in addition to uniting several properties in a single model, were also able to demonstrate that the origin of the helicoidal movement within the slug can come from simple physical properties, in contrast to some studies which claim the origin to be from chemotaxis in a system with scroll waves of chemical signaling." @default.
• W76604085 created "2016-06-24" @default.
• W76604085 creator A5058606115 @default.
• W76604085 date "2011-01-01" @default.
• W76604085 modified "2023-09-27" @default.
• W76604085 title "Simulação do ciclo de vida social da ameba Dictyostelium discoideum" @default.
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