Fluorescence Intensity and Anisotropy Decay of the 4',6-diamidino-2-phenylindole-DNA Complex Resulting from One-photon and Two-photon Excitation

Overview

Journal J Fluoresc

Specialties Biophysics
Chemistry

Date 2013 Nov 19

PMID 24243275

Citations 13

Authors

J R Lakowicz

I Gryczynski

Affiliations

Soon will be listed here.

Abstract

We examined the emission spectra, intensity decays, and anisotropy decays of the DNA-4',6-diamidino-2-phenylindole (DAPI) complex resulting from one- and two-photon excitation of fluorescence. Similar lifetimes and correlation times were recovered from the frequency-domain data. However, the initial anisotropies of DAPI for one- and two-photon excitation revealed different angles between the absorption and the emission oscillators, 17.8 and 23.8°, respectively. This suggests the presence of two overlapping transitions in DAPI with different one- and two-photon cross sections for absorption.

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