title: Fluorescence correlation spectroscopy in the nanosecond time range: rotational diffusion of bovine carbonic anhydrase B.
abstract: A fluorescence correlation experiment for measurement of rotational diffusion in the nanosecond time scale is described. Using this method, the rotational diffusion coefficient of bovine carbonic anhydrase B labelled with tetramethylrhodamine isothiocyanate was estimated to be Dr = (1.14 +/- 0.15) X 10(7) s-1 at 22 degrees C. The experiment is based on a cw argon ion laser, a microfluorometer with local solution flow inside the sample cell, and two photon detectors. The fluorescence intensity autocorrelation function in the nanosecond time range is computed with the help of a time-to-amplitude converter and a multichannel pulse-amplitude analyser.
mesh_terms: D000818:Animals; D002256:Carbonic Anhydrases / Q000378:metabolism*; D002417:Cattle; D005456:Fluorescent Dyes; D007700:Kinetics; D012235:Rhodamines; D013050:Spectrometry, Fluorescence; D013997:Time Factors
chemical_list: D005456:Fluorescent Dyes; D012235:Rhodamines; C009434:tetramethylrhodamine isothiocyanate; D002256:Carbonic Anhydrases