Fourier Transform Infrared microspectroscopy and chemometrics as a tool for the discrimination of cyanobacterial strains

Predicting Rank of Japanese Green Teas by Derivative Profiles of Spectra Obtained from Fourier Transform Near-Infrared Reflectance Spectroscopy

“…(6) has an intrinsic feature including a series of weighting factor 1/n as well as removing baseline effect reflected in constant A (Eq. (7)), which is consistent with the fact that derivative transformation removed baseline shifts [36]. As shown in Eq.…”

“…As shown in Eq. (8), a second order weight factor (1/n) 2 contributes to the second derivative, which leads to the fact that several papers have utilized the first and second derivative for feature description of NIR spectra [1,17,[36][37][38][39][40][41][42][43]. In general, the 1 st derivative is explained by a simple measure of the slop of the spectral curve at every point, and 2 nd derivative is a measure of the change in the slop of the curve.…”

Mode of Action and Synergy of Ceftazidime and Baicalein against <i>Streptococcus pyogenes</i>

“…The signal intensities and peak areas of these treated cells at ~1655 and ~1637 cm -1 were ceftazidime plus baicalein > ceftazidime > control, which corresponded to an absorption peak for the secondary structure of protein amide I (α-helix and β-sheet). The peak intensity pattern for the areas at ~1085 cm -1 was ceftazidime > control > ceftazidime plus baicalein, which correlated with an absorption peak for a nucleic acid (DNA and RNA) phosphodiester backbone (Figure 4c) [23,24]. The second loading of the treated and control groups indicated that the obvious regions at 3000-2800 cm -1 (~2963, ~2921, ~2875, ~2852 cm -1 ) could be attributed to the stretching modes of CH 2 and CH 3 in the fatty acids located on the various membrane amphiphiles and ester bands, respectively (Figure 4d) [25,26].…”

“…The biomolecule fingerprint clusters for the control and the ceftazidime alone or in combination with baicalein groups were clearly differentiated [23,27].…”

Hard X-ray synchrotron biogeochemistry: piecing together the increasingly detailed puzzle

“…Solomon et al [12] ) or for (synchrotron radiation-based) Fourier transform infrared ((SR-)FTIR) (e.g. Kansiz et al, [13] Webster et al [14] ), these still need to be fully developed for XRF techniques. In any case, even when routines for linear combination fitting at each pixel are developed (such as in the case of Etschmann et al [11] ), the issue of how to interpret and fully explore these large datasets remains.…”