Capsule self-oscillating gels showing cell-like nonthermal membrane/shape fluctuations

Area of Science:

• Biophysics
• Chemical Engineering
• Materials Science

Background:

• Cell membrane and shape fluctuations are crucial for biological functions.
• Understanding nonthermal active contributions to cell dynamics is a key research area.
• Existing experimental models often lack the ability to isolate active contributions.

Purpose of the Study:

• To create a millimeter-scaled experimental model that replicates active contributions to cell-like shape fluctuations.
• To investigate the role of active chemical parameters in driving these fluctuations.
• To establish a platform for studying the effects of active parameters on cell dynamics.

Main Methods:

• Fabrication of millimeter-scaled capsule self-oscillating gel.
• Integration of the Belousov-Zhabotinsky (BZ) reaction within the gel.
• Observation and analysis of gel shape fluctuations induced by chemical signals.
• Systematic variation of gel layer thickness and BZ reaction substrate concentration.

Main Results:

• The capsule self-oscillating gel exhibited cell-like shape fluctuations driven by the BZ reaction.
• Fluctuations were absent without the BZ reaction, confirming the active chemical origin.
• The period and amplitude of fluctuations were dependent on gel thickness and BZ substrate concentration.

Conclusions:

• The developed gel model effectively mimics actively driven cell-like fluctuations.
• This system provides a robust experimental platform for studying the impact of active parameters on cell dynamics.
• The findings contribute to a deeper understanding of nonthermal active contributions in biological systems.