Rene B. Svensson, Hindrik Mulder, Vuokko Kovanen, S. Peter Magnusson

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Fracture Mechanics of Collagen Fibrils: Influence of Natural Cross-Links Rene B. Svensson, Hindrik Mulder, Vuokko Kovanen, S. Peter Magnusson Biophysical Journal Volume 104, Issue 11, Pages 2476-2484 (June 2013) DOI: 10.1016/j.bpj.2013.04.033 Copyright © 2013 Biophysical Society Terms and Conditions

Figure 1 (A) Relation between AFM deflection sensitivity in wet and dry conditions, including a linear fit. (B) Deviation from linearity of the detector as a function of the measured deflection voltage. Dots are data from three separate measurements (down sampled 40× for clarity) and the line is a 3rd order polynomial fit. Biophysical Journal 2013 104, 2476-2484DOI: (10.1016/j.bpj.2013.04.033) Copyright © 2013 Biophysical Society Terms and Conditions

Figure 2 (A) Across our present and previous measurements, we observe an increase in collagen fibril modulus with the length of the tested specimen. (B) Plot of the fibril compliance multiplied with fibril CSA (C × A) as a function of fibril length, including a linear fit (see text for details). Biophysical Journal 2013 104, 2476-2484DOI: (10.1016/j.bpj.2013.04.033) Copyright © 2013 Biophysical Society Terms and Conditions

Figure 3 (A) Stress-strain response of a representative HPT collagen fibril. Three distinct regions (denoted I, II, and III) are observed. (B) The local modulus of the same curve as a function of strain. The three regions give rise to two distinct peak modulus values, Mod1 and Mod2. Biophysical Journal 2013 104, 2476-2484DOI: (10.1016/j.bpj.2013.04.033) Copyright © 2013 Biophysical Society Terms and Conditions

Figure 4 Mechanical response of (A) HPT collagen fibrils. (B) Native RTT fibrils (black) compared to the HPT fibrils (gray). (C) Reduced RTT (black) compared to native RTT (gray). (D) ZDF RTT (black) compared to native RTT (gray). Biophysical Journal 2013 104, 2476-2484DOI: (10.1016/j.bpj.2013.04.033) Copyright © 2013 Biophysical Society Terms and Conditions

Figure 5 Height and amplitude AFM images of collagen fibril breakage sites after failure testing. A failure mode with a largely intact fibril and one with a heavily disrupted fibril was observed (the structure present toward the right of the images continues throughout the rest of the fibril). Biophysical Journal 2013 104, 2476-2484DOI: (10.1016/j.bpj.2013.04.033) Copyright © 2013 Biophysical Society Terms and Conditions

Figure 6 Mechanical response of untreated (gray) and NaBH4 treated (black) fascicles. Biophysical Journal 2013 104, 2476-2484DOI: (10.1016/j.bpj.2013.04.033) Copyright © 2013 Biophysical Society Terms and Conditions