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- W2143403424 abstract "Herein we describe a strategy for correcting the longitudinal or axial component of chromatic aberration in confocal Raman microspectroscopy. The method is based on measuring a vertical series of confocal Raman sections of samples by a high numerical aperture Raman microscope. Using the known characteristics of the wavelength-dependent focal shift of the optical system, the Raman intensities can be corrected to allow the rearrangement of Raman data from different focal planes. In the present study the computational correction routine was applied to an experimental data set of 4-dimensional (xyz spatial and the spectral dimension) confocal Raman spectra collected from single spores of Bacillus cereus. After correcting the axial component of the chromatic aberration, univariate and multivariate spectral parameters were obtained and used in the following for 3D segmentation and volume rendering on the basis of the structural and compositional information contained in the Raman spectra of the spore. Using univariate Raman intensities from defined functional group frequencies or k-means cluster membership values as a multivariate parameter for volume rendering, we demonstrate a high degree of correlation between confocal Raman microspectroscopy and the spores' morphology. In this paper we will also present cluster mean spectra which will be discussed in light of the presence of proteins and Ca-DPA, a calcium chelate of dipicolinic acid in the spore." @default.
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- W2143403424 date "2009-01-01" @default.
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- W2143403424 title "Correction of axial chromatic aberrations in confocal Raman microspectroscopic measurements of a single microbial spore" @default.
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- W2143403424 doi "https://doi.org/10.1039/b822553b" @default.
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