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Table 2.

Dynamic material properties of silk spun by Argiope argentata and the western black widow Latrodectus hesperus

Loss tangent
Storage modulus (GPa)
SilkInitialMaxFinalInitialAt max. loss tanFinalSource
Major ampullate (N=4, n=27) 0.077±0.003 0.172±0.009 0.054±0.002 6.2±0.3 7.8±0.2 40.4±0.9 This study 
    Latrodectus hesperus (n=12) 0.063±0.007 0.197±0.009 0.075±0.003 8.7±1.1 10.6±0.8 47.6±3.3 (Blackledge et al., 2005c) 
Tubuliform (N=1, n=6) 0.031±0.003 0.113±0.010 0.068±0.006 6.5±0.5 7.5±0.7 12.8±1.0 This study 
Minor ampullate (N=2, n=6) 0.054±0.009 0.160±0.005 0.072±0.001 10.5±0.6 10.0±0.8 48.0±2.2 This study 
Aciniform (N=1, n=2) 0.043±0.007 0.149±0.021 0.023±0.013 24.6±3.0 24.4±4.1 54.7±0.0 This study 
Capture spiral (N=1, n=6) — — 0.057±0.011 — — 24.5±1.8 This study 
Loss tangent
Storage modulus (GPa)
SilkInitialMaxFinalInitialAt max. loss tanFinalSource
Major ampullate (N=4, n=27) 0.077±0.003 0.172±0.009 0.054±0.002 6.2±0.3 7.8±0.2 40.4±0.9 This study 
    Latrodectus hesperus (n=12) 0.063±0.007 0.197±0.009 0.075±0.003 8.7±1.1 10.6±0.8 47.6±3.3 (Blackledge et al., 2005c) 
Tubuliform (N=1, n=6) 0.031±0.003 0.113±0.010 0.068±0.006 6.5±0.5 7.5±0.7 12.8±1.0 This study 
Minor ampullate (N=2, n=6) 0.054±0.009 0.160±0.005 0.072±0.001 10.5±0.6 10.0±0.8 48.0±2.2 This study 
Aciniform (N=1, n=2) 0.043±0.007 0.149±0.021 0.023±0.013 24.6±3.0 24.4±4.1 54.7±0.0 This study 
Capture spiral (N=1, n=6) — — 0.057±0.011 — — 24.5±1.8 This study 

All values are mean ± s.e.m. For these data only, s.e.m. was calculated using the total number of fibers tested (n) as the sampling unit rather than individual spiders (N). —, data were not obtained.

All silks are from Argiope argentata, except major ampullate silk from Latrodectus hesperus.

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