Figure 4. Micro-Raman Signatures and Optical Micrographs of Periadipocyte and Vascular Calcifications.

Micrographs (original magnifications ×10 and ×100) of (A) Periadipocyte and (B) Vascular calcifications (excitation wavelength λ_exc = 785 nm; numerical aperture, 0.9). The Raman bands at 960, 1076, and 590 cm^–1 correspond, respectively, to the ν₁, ν₃ and ν₄ phosphate vibrations of apatite. The low-intensity ν₄ carbonate vibrations around 680 to 715 cm^–1, expected for carbapatite, are not observed. The strong fluorescence background has been corrected on the presented spectra.