Regensburg 2013 – wissenschaftliches Programm
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BP: Fachverband Biologische Physik
BP 26: Posters: Biomaterials and Biopolymers (joint with CPP)
BP 26.6: Poster
Mittwoch, 13. März 2013, 17:30–19:30, Poster C
Melting of pectin gels — •Andrea Kramer1, Romaric Vincent2, Brad Mansel3,4, Klaus Kroy1, and Martin Williams3,4,5 — 1Institute for Theoretical Physics, Universität Leipzig, Germany — 2Institute for Bioengineering of Catalonia, Spain — 3Institute of Fundamental Sciences, Massey University, NZ — 4MacDiarmid Institute for Advanced Materials and Nanotechnology, NZ — 5Riddet Institute, NZ
Pectin gels are the major scaffolding structures responsible for the mechanical stability of plant cells. We have analyzed their slow dynamics and linear and nonlinear viscoelasticity as a function of temperature, using various (micro-)rhelogical techniques and theory. The results are compared to literature data for F-actin and live cells. We find that the linear microrheological and strain-stiffening responses of pectin networks are well-captured by the glassy wormlike chain (GWLC) model. The nonlinear mechanical response is much more sensitive to temperature changes than the linear response, a property that is also observed in F-actin networks and can be accounted for by the model. But the overall sensitivity to temperature changes turns out to be much more pronounced in actin than in pectin, possibly hinting at a temperature anomaly of actin.