Published in

Elsevier, Acta Biomaterialia, 11(10), p. 4832-4842, 2014

DOI: 10.1016/j.actbio.2014.07.023

Links

Tools

Export citation

Search in Google Scholar

A spider's biological vibration filter: Micromechanical characteristics of a biomaterial surface

This paper is available in a repository.
This paper is available in a repository.

Full text: Download

Green circle
Preprint: archiving allowed
Orange circle
Postprint: archiving restricted
Red circle
Published version: archiving forbidden
Data provided by SHERPA/RoMEO

Abstract

A strain sensing lyriform organ (HS-10) on all legs of a Central American wandering spider (Cupiennius salei) detects courtship, prey, and predator vibrations transmitted by the plant on which it sits. It has been suggested that the viscoelastic properties of a cuticular pad directly adjacent to the sensory organ contribute to the organ's pronounced high-pass characteristics. Here, we investigate the micromechanical properties of the cuticular pad biomaterial in search of a deepened understanding of its impact on the vibration sensoŕs function. These are considered to be an effective adaptation for the selective detection of signals for frequencies greater than 40 Hz. Using surface force spectroscopy mapping we determine the elastic modulus of the pad surface through a temperature range of 15-40 °C at various loading frequencies. In the glassy state, the elastic modulus was about 100 MPa, while in the rubbery state the elastic modulus decreased to 20 MPa. These data are analyzed according to the principle of time-temperature superposition to construct a master curve that relates mechanical properties, temperature, and stimulus frequencies. Estimation of loss and storage moduli versus temperature and frequency allowed for the direct comparison with electrophysiology experiments and revealed that the dissipation of energy occurs within a frequency window whose position is controlled by environmental temperatures.