Half-frequency spectral signatures
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United States of America Patent
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Feb 20, 2018
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Aug 6, 2012
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Mar 29, 2012
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Abstract
A technique for determining whether or not a fluorescent material exhibits a directionally dependent property, such as anisotropy or chirality, involves illuminating the particle at its excitation wavelength to stimulate fluorescent emission at both a full-frequency (fundamental) wavelength and a half-frequency wavelength. The ratio of the full-frequency signal strength to the half-frequency signal strength provides an indication of the sample's directionally dependent property. This half-frequency spectral analysis can be used to sort anisotropic particles suspended in fluid flowing through a flow cytometer. For instance, the present technique may be used to separate racemic mixtures of chiral enantiomers of cells, pharmaceutical compounds, and other samples.
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