Energy Dissipation in the AFM Elasticity Measurements

• Authors: O. Klymenko , J. Wiltowska-Zuber , M. Lekka , W. Kwiatek
• Languages of publication: EN

Abstracts

EN

Nowadays, it is well established that changes of cell stiffness observed by atomic force microscopy are linked with the cell cytoskeleton. Its structural and functional alterations are underlying major diseases such as cancer, inflammation or neurodegenerative disorders. So far, the use of atomic force microscopy is mostly focused on the determination of the Young modulus using the modified Hertz model. It can quantitatively describe the elastic properties of living cells, however, its value is burdened by the fact that cells are neither isotropic nor homogeneous material. Often, during the atomic force microscopy measurements, the hysteresis between the loading and unloading curves are observed which indicates the dissipation of an energy. In our studies, the index of plasticity was introduced to enumerate such effect during a single loading-unloading cycle. As the results show, such approach delivers an additional parameter describing the mechanical state of cell cytoskeleton. The analysis was performed on test samples where the mechanical properties of the melanoma cells were changed by glutaraldehyde and cytochalasin D treatments. The non-treated cells were compared with fibroblasts.

Keywords

EN

68.37.Ps; 87.10.Vg; 87.15.La

Discipline

• 87.15.La: Mechanical properties
• 87.10.Vg: Biological information
• 68.37.Ps: Atomic force microscopy (AFM)

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 2009
• Volume: 115
• Issue: 2
• Pages: 548-551

Dates

published

2009-02

Contributors

author

O. Klymenko

• Institute of Nuclear Physics, Radzikowskiego 152, 32-341 Cracow, Poland

author

J. Wiltowska-Zuber

• Institute of Nuclear Physics, Radzikowskiego 152, 32-341 Cracow, Poland

author

M. Lekka

• Institute of Nuclear Physics, Radzikowskiego 152, 32-341 Cracow, Poland

author

W. Kwiatek

• Institute of Nuclear Physics, Radzikowskiego 152, 32-341 Cracow, Poland

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Identifiers

DOI

10.12693/APhysPolA.115.548