(a) Optical tweezers single-molecule assay for measuring the force–extension curve of DNA and (b) measured force–extension curve for λ-phage DNA.
Figure (a) is reprinted from Baumann et al., Proc. Natl. Acad. Sci. U.S.A. 94, 6185–91. Copyright (1997) National Academy of Sciences, U.S.A.
Fig. 13.2 — Probing the mechanical properties of single DNA molecules