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Volume 618 Issue 7966, 22 June 2023

Molecular repellent

Springtails (Collembola), such as Tetrodontophora bielanensis shown on the cover, are invertebrates that respire through their skin and so need to keep that surface free from contamination. In this week’s issue, Carsten Werner and his colleagues reveal how layers of cholesterol give springtails their non-stick coating. Using a combination of experiments and atom-level simulations, the researchers found that the repulsive ability of cholesterol layers arises from fluctuations in the orientation of the cholesterol molecules. These fluctuations give rise to ‘entropic repulsion’ — essentially, adsorption of biomolecules onto the skin would require the cholesterol molecules to be constrained, which would lower the entropy and so is thermodynamically less favourable. The team suggests this insight could help the design of materials that limit adhesion.

Cover image: Stephan Floss/Leibniz Institute of Polymer Research Dresden (IPF)

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