. . . . "At fast pulling rates alpha-helical and beta-sheet domains unfold by sequential rupture of individual hydrogen bonds; at slow pulling rates they unfold by simultaneous rupture of several hydrogen bonds." . "mechanism" . . "Fast pulling ruptures hydrogen bonds one at a time; slow pulling ruptures several at once" . "Theodor Ackbarow et al., “Hierarchies, multiple energy barriers, and robustness govern the fracture mechanics of α-helical and β-sheet protein domains”, Proceedings of the National Academy of Sciences 104, 16410-16415 (2007), doi:10.1073/pnas.0705759104; Abstract. Scope: Alpha-helical and beta-sheet domains in atomistic simulation" . "Theodor Ackbarow, Xuefeng Chen, Sinan Keten, Markus J. Buehler. Hierarchies, multiple energy barriers, and robustness govern the fracture mechanics of α-helical and β-sheet protein domains. Proceedings of the National Academy of Sciences 104, 16410-16415 (2007). doi:10.1073/pnas.0705759104" . "Theodor Ackbarow, Xuefeng Chen, Sinan Keten, Markus J. Buehler" . "2007"^^ . "PMC2034213" . "doi:10.1073/pnas.0705759104" . "pmid:17925444" . "Hierarchies, multiple energy barriers, and robustness govern the fracture mechanics of α-helical and β-sheet protein domains" . . . "delphisci buehler-protein-materials claim extractor" . . . . "Claude Fable 5.1" . . . . . . . . . . . . "Quoted from the published abstract as returned by Europe PMC (2007-hierarchies.abstract.txt, sha256 4f052f4a8a9ddc7dfecc384493c31e0f00fcd9873ded36486b8618493fdf4e18); the full text was not read (not in Europe PMC open-access subset). Checked by build/check.py." . . . "Whereas the unfolding mechanism at fast pulling rates is sequential rupture of individual hydrogen bonds (HBs), unfolding at slow pulling rates proceeds by simultaneous rupture of several HBs." . . "4f052f4a8a9ddc7dfecc384493c31e0f00fcd9873ded36486b8618493fdf4e18" . "Checksum of the vendored text file inputs/2007-hierarchies.abstract.txt, not of the publisher's copy." . . . "Abstract of Hierarchies, multiple energy barriers, and robustness govern the fracture mechanics of α-helical and β-sheet protein domains, as read" . . "buehler-protein-materials" . "2026-11-08T04:38:11.893Z"^^ . . . . . "Theodor Ackbarow et al. 2007 claim: Fast pulling ruptures hydrogen bonds one at a time; slow pulling ruptures several at once" . . "RSA" . "MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAyFHtPB6p0mCjDozxlOY9CmO3nBm7Te3jFbXyLmM+G1tGe47Da0jYIbhkl9Oo1ZjxmCa3LCwlEqK8gj6hEIcL4ahW30JXh9HycfKVk1bugkzMEV15tJdTzAU3sGMFnbNsn43xY2LFLy45tApkRm5byEiM7oRRrooIdwoQKnP4Wzq/bfAoJ9qvW+MGkelyOTd1jbSt+KfmT7xKmDfWzAHddUlWwMX2QJOLxDaffOteTop6ZRgPiNmPJKA/S62Gac9XtSYT3oDkZ6/nr5cxxNLpOyxTf5FPISiCe11xYO/unYjY+mwnOfA8yhJIyx1l0O9I0vpOpn+E5TvyHJV+oSTrvwIDAQAB" . "EU7oHktn6DMnzLWzVRgT9lMYTqc9WikAp6j4s6iFIrdehqJuUpOBQ7pAFoSW7xgr/2W92GLtDBvQHpz/JtT8weMHSkJtrOf1kz3UfpimP6uGpLqv0M/4rmA////RhhT4i8WgrlvfxaondajY04hNuKqQwMUWl9bG8AVi6oQvsYbu5uhS8EdMHPD2uxyfMjO7xbFygmuBPTawaox1vUqAQHO+1Us9RtaE5+70kXA0CH3gJ5fbVwwvKJhl5a/YDc8QhjjcAEzJq6aDzTHWzKHROptGAauCeFyn4w8ACkeToKTKJ5/uhywxFmHkmgmgF13+cYlixukZPwC7UOKS8uakYA==" . . .