Figure 4From: Detection and differentiation of bacterial spores in a mineral matrix by Fourier transform infrared spectroscopy (FTIR) and chemometrical data treatmentMultiscaling principal component analysis (PCA) of spores of Bacillus megaterium in the presence of the clay mineral bentonite at different spore/bentonite (wt/wt) ratios. "B mega": Bacillus megaterium without bentonite; "bentonite": pure bentonite without spores. Second derivatives of original spectra were truncated (750 - 1800 cm-1) and used for PCA. Five independent replicates per sample were measured. Drop lines are given for the PC1/PC2 plane.Back to article page