The grouping and identification made by Fourier-transform infrared spectroscopy (FT-IR) of 40 oral streptococcal strains was compared with their known taxonomic positions. Grouping was obtained by cluster analysis on the spectral distances between the first derivative spectra of the strains. Spectra were divided into five spectral ‘windows’ and clu...
The interaction of 1,2-dipalmitoylglycerol (DPG) with dipalmitoylphosphatidylserine (DPPS) has been studied in aqueous dispersion in the presence and in the absence of Ca 2+ by using Fourier transform infrared spectroscopy (FT-IR) and 45Ca 2+-binding. FT-IR showed that DPG increased the phase transition of DPPS and induced a rigidification of the D...
The lamellar gel to lamellar liquid-crystalline phase transition of dipalmitoylphosphatidylserine (DPPS) multilamellar membranes is abolished by the presence of Ca 2+ at DPPS/Ca 2+ molar ratios of 2:1 or lower. However, when equimolar sphingosine (SPH) or stearylamine (SA), which are positively charged at the pH studied in this work, were included ...
