Table 2.
Structural and mechanical parameters (mean ± SD)
| HPT | N-RTT | R-RTT | ZDF-RTT | RTT-all | |
|---|---|---|---|---|---|
| Tested length (μm) | 33 ± 5 | 34 ± 4 | 37 ± 5 | 32 ± 2 | 35 ± 4 |
| CSA (μm2) | 0.021 ± 0.004 | 0.033 ± 0.018 | 0.031 ± 0.011 | 0.025 ± 0.006 | 0.036 ± 0.014 |
| Mod1 (GPa) | 3.5 ± 0.4 | 2.2 ± 0.9 | 2.9 ± 0.4 | 2.9 ± 0.5 | 2.6 ± 0.7 |
| Mod1 strain (%) | 3.3 ± 1.1 | 4.6 ± 2.8 | 4.0 ± 0.9 | 5.7 ± 2.5 | 4.6 ± 2.2 |
| Mod2 (GPa)a | 4.3 ± 1.4 | 1.4 ± 0.7 | 1.5 ± 0.5 | 1.9 ± 0.5 | 1.6 ± 0.6 |
| Ultimate stress (MPa) | 540 ± 140 | 200 ± 110 | 290 ± 80 | 270 ± 60 | 250 ± 100 |
| Ultimate strain (%) | 20 ± 1 | 16 ± 4 | 19 ± 4 | 16.5 ± 2 | 17 ± 4 |
| Mod2/Mod1a | 1.24 ± 0.35 | 0.60 ± 0.30 | 0.51 ± 0.18 | 0.73 ± 0.34 | 0.59 ± 0.26 |
a
Not all RTT fibrils showed the 2nd modulus increase, presented data are for 5 N-RTT, 5 R-RTT, and 3 ZDF-RTT fibrils that show the increase.