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. Author manuscript; available in PMC: 2015 Aug 15.
Published in final edited form as: Biosens Bioelectron. 2014 Feb 28;58:249–257. doi: 10.1016/j.bios.2014.02.053

Fig. 5.

Fig. 5

(a) Representative fluorescent images of (i) low cell density (753 cells/cm2) and (ii) high cell density (24,448 cells/cm2) on chemFN QCM sensors, respectively. Both scale bars are 200 μm. The image shown in (i) was taken at 4×, while the image shown in (ii) was taken at 10×. (b) Viscosity (black) and shear modulus (gray) versus thickness of the cell layer on the chemFN layer. Exp 1 corresponds to (a(i)) and exp 2 corresponds to (a(ii)). The properties of the chemFN layer (derived from exp 1) are as follows: in-situ thickness=6 nm, viscosity=1.64 × 10−3 Ns/m2, shear modulus=0.45 × 104 N/m2.