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Experimental and Modeling Analysis of the Cell-Wall Fracture of Nannochloropsis Oculata

Published online by Cambridge University Press:  29 June 2020

Wei-Hsuan Hsu ,
Yin-Hsuan Chien  and
Hung-Yin Tsai Open the ORCID record for Hung-Yin Tsai [Opens in a new window]
Wei-Hsuan Hsu
Affiliation:
Department of Mechanical Engineering, National United University, Miaoli, Taiwan R.O.C.
Yin-Hsuan Chien
Affiliation:
Department of Power Mechanical Engineering, National Tsing Hua University, Hsinchu, Taiwan R.O.C.
Hung-Yin Tsai*
Affiliation:
Department of Power Mechanical Engineering, National Tsing Hua University, Hsinchu, Taiwan R.O.C.
*
*Corresponding author (hytsai@pme.nthu.edu.tw)
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Abstract

In this study, a spherical indenter mounted on an atomic force microscope (AFM) was used to compress a Nannochloropsis oculata (N. oculata) cell on a poly-l-lysine coated slide. A mathematical model of the cell, which was derived by considering a fluid-filled spherical shell with axisymmetric compression between a sphere and an infinite flat plate, is proposed. In the construction of this mathematical model, the spherical shell was assumed to be a homogenous, isotropic, and elastic material. Thin-film theory was applicable to the spherical shell because the thickness of the shell was nearly negligible compared with its diameter. The governing equations of the contact and noncontact regions were converted from a boundary condition problem to an initial value problem. Then, the fourth-order Runge–Kutta method was applied to solve the transformed governing equations. The force curve obtained from the compression experiment was compared with the theoretical results derived from the proposed model. Furthermore, the numerical solution of the proposed model was verified to be consistent with the experimental data. The mechanical properties of cell walls were confirmed by applying the least square error method. Subsequently, the contact radius, inner pressure and tension distribution of the cell wall could be determined using the proposed model. The models proposed in other studies are suitable for analyzing the compression characteristics of cells whose size is of the order of tens of micrometers and millimeters. By contrast, the model proposed in this study can analyze the compression characteristics of N. oculata, which is only a few micrometers in diameter. Furthermore, a force curve that accurately describes the deformation behavior of N. oculata under strain levels of 25% was established.

Keywords

MicroalgaeCell wallFractureSpherical shell
Type
Research Article
Information
Journal of Mechanics , Volume 36 , Issue 6 , December 2020 , pp. 789 - 797
Copyright
Copyright © 2020 The Society of Theoretical and Applied Mechanics

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