DPG Phi
Verhandlungen
Verhandlungen
DPG

Dresden 2011 – scientific programme

Parts | Days | Selection | Search | Updates | Downloads | Help

CPP: Fachverband Chemische Physik und Polymerphysik

CPP 28: Biopolymers and Biomaterials II (jointly with BP)

CPP 28.3: Talk

Wednesday, March 16, 2011, 11:00–11:15, ZEU 260

Mechanics and Dynamics of Individual Intermediate Filaments — •Bernd Nöding, Susanne Bauch, and Sarah Köster — Courant Research Centre Nano-Spectroscopy and X-Ray Imaging, University of Göttingen, Germany

The mechanical rigidity of a polymer is characterized by its persistence length LP. In the case of the intermediate filament (IF) protein vimentin, LP was found to be on the order of one micrometer using static measurement methods. In contrast, we perform dynamic measurements on fluorescently labeled IFs confined in microchannels, thereby realizing the Odijk confinement regime. Since IFs can be classified as semiflexible polymers (LLP) we assume the worm-like chain model for our fluctuation analysis. The channel walls are included as a parabolic potential in our calculations. Interaction of the filament and the confining microchannel gives rise to an additional length scale, the deflection length λ. We combine IF data with literature data for actin. Thereby we can access both the channel dimension d and LP, which define the scaling law connecting λ and LP, λ = a · d2/3 · LP1/3. The scaling law is fully confirmed by our experiments. Additionally our dynamic measurements yield LP on the order of one micrometer for vimentin filaments.

100% | Mobile Layout | Deutsche Version | Contact/Imprint/Privacy
DPG-Physik > DPG-Verhandlungen > 2011 > Dresden