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Single molecule fluorescence resonance energy transfer (FRET) and fluorescence correlation spectroscopy were used to investigate DNA looping by NgoMIV restriction endonuclease. Using a linear double-stranded DNA (dsDNA) molecule labeled with a fluorescence donor molecule, Cy3, and fluorescence acceptor molecule, Cy5, and by varying the concentration of NgoMIV endonuclease from 0 to 3×10−6M, it was...
Time-resolved fluorescence of chromatophores isolated from strains of Rhodobacter sphaeroides containing light harvesting complex I (LHI) and reaction center (RC) (no light harvesting complex II) was measured at several temperatures between 295K and 10K. Measurements were performed to investigate energy trapping from LHI to the RC in RC mutants that have a P/P+ midpoint potential either above or below...
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