For High Resolution cell imaging. In fluorescence microscopy, wide variations between localized fluorophore concentrations within the specimen, coupled to differences in extinction coefficient and quantum yield from one fluorochrome to another, significantly influence the emission signal produced for a given quantity of excitation intensity. Considering that many specimens contain only minute quantities of fluorescent material in any particular viewfield, these combined factors produce an average level of fluorescence emission that is four to six orders of magnitude less than the excitation intensity.
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