Abstract
Fluorescent semiconductor quantum dots (QDs) are a novel class of fluorescent probe whose unique optical properties suggest that they are superior to conventional organic dyes for many biological applications. Semiconducting quantum dot have been shown to possess several photophysical properties that are superior to those of organic fluorophores: high-absorp- tion cross sections, excellent photostability, broad excitation spectra, narrow symmetric, materials- and size-dependent emiss- ion spectra, and narrow emission spectra. 1 Because of these characteristics, QDs are an interesting alternative to organic fluorophores in some biotechnological and biomedical appli- cations. 2 These attractive fluorescence properties are particu- larly appealing for the visualization of cellular processes, as they can potentially facilitate long-term and multicolor labeling of both fixed and living cells. 3
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