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Relaxation of a single DNA molecule observed by optical microscopy
Relaxation of a single DNA molecule observed by optical microscopy.
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Single molecules of DNA, visualized in video fluorescence microscopy, were stretched to full extension in a flow, and their relaxation was measured when the flow stopped. The molecules, attached by one end to a 1-micrometer bead, were manipulated in an aqueous solution with optical tweezers. Inverse Laplace transformations of the relaxation data yielded spectra of decaying exponentials with distinct peaks, and the longest time component (tau) increased with length (L) as tau approximately L 1.68 +/- 0.10. A rescaling analysis showed that most of the relaxation curves had a universal shape and their characteristic times (lambda t) increased as lambda t approximately L 1.65 +/- 0.13. These results are in qualitative agreement with the theoretical prediction of dynamical scaling.
Perkins TT, Quake SR, Smith DE, Chu S
Science (New York, N.Y.)
1994-05-06 00:00
264
5160
822-6
Algorithms,Bacteriophage lambda,DNA, Viral,Fluorescent Dyes,Image Processing, Computer-Assisted,Microscopy, Fluorescence,Microspheres,Models, Chemical,Nucleic Acid Conformation,DNA, Viral,Fluorescent Dyes
Department of Physics, Stanford University, CA 94305
Science
PHS 33289
0036-8075
1003
True
8171336
