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Start Over Author "Rusciano, Giulia" Journal journal of biophotonics
4 results on '"Rusciano, Giulia"'

3. High- and low-frequency mechanical properties of living starfish oocytes.

Author

Pesce, Giuseppe, Selvaggi, Lara, Rusciano, Giulia, and Sasso, Antonio

Abstract

We studied the mechanical properties of living starfish oocytes belonging to two species, Astropecten Auranciacus and Asterina pectinifera, over a wide range of timescales. We monitored the Brownian motion of microspheres injected in the cytoplasm using laser particle-tracking (LPT) and video multiple-particle-tracking (MPT) techniques, to explore high- and low-frequency response ranges, respectively. The analysis of the mean-square-displacements (MSD) allowed us to characterize the samples on different timescales. The MSD behavior is explained by three power-law exponents: for short times ( τ < 1 ms) it reflects the semiflexible behavior of the actin network; for intermediate timescales (1 ms < τ < 1 s) it is similar to that of a soft-glass material; finally for long times ( τ > 1 s) it behaves mainly like a viscous medium. We computed and compared the viscoelastic moduli using a recently proposed model describing the frequency response of the cell material. The large fluctuations found in the MSD over hundreds of trajectories indicate and confirm the significant cytoplasm heterogeneity. (© 2011 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim) [ABSTRACT FROM AUTHOR]

Published
2011
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4. High- and low-frequency mechanical properties of living starfish oocytes

Author

Antonio Sasso, Giuseppe Pesce, Giulia Rusciano, Lara Selvaggi, Pesce, Giuseppe, Lara, Selvaggi, Rusciano, Giulia, and Sasso, Antonio

Subjects
Microrheology, Frequency response, Time Factors, Starfish, General Physics and Astronomy, Low frequency, General Biochemistry, Genetics and Molecular Biology, Viscoelasticity, Optics, Species Specificity, Elastic Modulus, Animals, General Materials Science, Astropecten, Brownian motion, Mechanical Phenomena, biology, business.industry, Chemistry, Viscosity, Lasers, General Engineering, General Chemistry, biology.organism_classification, Biomechanical Phenomena, Cytoplasm, Chemical physics, Asterina, Oocytes, business, Rheology
Abstract

We studied the mechanical properties of living starfish oocytes belonging to two species, Astropecten Auranciacus and Asterina pectinifera, over a wide range of timescales. We monitored the Brownian motion of microspheres injected in the cytoplasm using laser particle-tracking (LPT) and video multiple-particle-tracking (MPT) techniques, to explore high- and low-frequency response ranges, respectively. The analysis of the mean-square-displacements (MSD) allowed us to characterize the samples on different timescales. The MSD behavior is explained by three power-law exponents: for short times (τ1 ms) it reflects the semiflexible behavior of the actin network; for intermediate timescales (1 msτ1 s) it is similar to that of a soft-glass material; finally for long times (τ1 s) it behaves mainly like a viscous medium. We computed and compared the viscoelastic moduli using a recently proposed model describing the frequency response of the cell material. The large fluctuations found in the MSD over hundreds of trajectories indicate and confirm the significant cytoplasm heterogeneity.

Published
2010

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