Fig. 2 | Nature Communications

Fig. 2

From: Hygroscopic compounds in spider aggregate glue remove interfacial water to maintain adhesion in humid conditions

Fig. 2

SFG spectra for pristine and washed aggregate glue. SFG spectra for pristine aggregate glue/sapphire (red empty squares) and washed aggregate glue/sapphire (black empty circles) interfaces collected at low humidity (10% RH) in PPP (a) and SSP (b) polarizations. The solid lines are a fit to the Lorentzian equation. Pristine aggregate glue consists of both glycoproteins and LMMCs, while washed aggregate glue consists of predominantly glycoproteins (Supplementary Fig. 2)20, 45. The similarity between the pristine and washed aggregate glue SFG spectra suggests the presence of glycoproteins at the aggregate glue/sapphire contact interface. The slight differences in the hydrocarbon peaks are not discussed due to difficulty in de-convoluting the hydrocarbon peaks

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