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Master's Dissertation
DOI
https://doi.org/10.11606/D.43.2015.tde-12092015-132058
Document
Author
Full name
Mariana Oshima Menegon
E-mail
Institute/School/College
Knowledge Area
Date of Defense
Published
São Paulo, 2015
Supervisor
Committee
Alencar, Adriano Mesquita (President)
Mesquita, Oscar Nassif de
Oliveira, Mario Jose de
Title in English
Rheological characterization of actin polymeric networks: measurement and numerical modeling
Keywords in English
biopolímeros
difusão
reologia
simulação
Abstract in English
An outstanding problem of cellular mechanics is how to relate changes on the cytoskeleton which result in modifications of the viscoelastic properties of the cells. The proposal of this work is to understand the mechanical behavior of actin fibers, the major component of cytoskeleton, by means of experiments and development of a computational model that describe it, in an attempt to understand the microscopic origins of the viscoelasticity of F-actin networks. In this context, extensive scientific literature has focused on models of specific behaviors of the cytoskeleton fibers, specifically on actin filaments. However, the global question related to the cellular level remains open. In vitro actin solutions experiments were the starting point to study the mechanical behavior of the fibers. The produced experimental data was the gold standard to the numerical models that was developed to simulate the viscoelastic properties of the actin network. Thus, we built an experimental and computational framework to study the mechanical properties of the cytoskeleton, by the means of its most abundant component.
Title in Portuguese
Caracterização reológica de redes poliméricas de actina: medição e modelagem numérica
Keywords in Portuguese
biopolímeros
difusão
reologia
simulação
Abstract in Portuguese
Um problema proeminente em mecânica celular é relacionar como as modificações do citoesqueleto das células eucariontes resultam em alterações nas suas propriedades viscoelásticas. A proposta deste projeto é entender o comportamento mecânico das fibras de actina, principal componente do esqueleto celular, através de experimentos e do desenvolvimento de um modelo computacional que o descreva, na tentativa de entender as origens microscópicas da viscoelasticidade de redes de actina. Nesse contexto, existe uma extensa bibliografia voltada a modelos de comportamentos específicos das fibras do esqueleto celular, em particular, dos filamentos de actina. Contudo, a questão global relativa ao nível celular permanece em aberto. Experimentos com géis de actina in vitro foram o ponto de partida para conhecer os comportamentos mecânicos das fibras. Os dados experimentais obtidos foram a referência principal aos modelos matemáticos desenvolvidos para simular as propriedades viscoelásticas da rede de actina. Assim, foi montado um ambiente de trabalho, experimental e computacional, para estudar as propriedades mecânicas do citoesqueleto por meio de seu componente mais abundante.
 
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dissertacaoMariana.pdf (12.42 Mbytes)
Publishing Date
2015-09-21
 
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