Raman research on black colored hair has been limitedly reported, because (i) the laser incident frequently burns and destroys the hair; (ii) Raman bands of melanin are much larger and broader, overlapped with the other hair originated Raman signals, which stopped Raman hair analysis. Here, we realized a versatile bio-Raman hair analysis including black colored hair system, (i) by fabricating a semi ultrathin cross section with the thickness of 500 nm of black hair using an ultramicrotome; (ii) by separating the signal of melanin from that of other hair components using the automatic background removal method that recently we developed.
For straight perm, the microscopic mechanism is still unclear, especially for changes in the secondary structure of the protein of the hair. Expecting to find a better condition for the straight perm treatment, we made the research on grey hair using the Raman imaging technique and principal component analysis (PCA). We succeeded to detect changes in different secondary structures such as β-turn and α-helix and to visualize their distributions.
Simultaneous use of magnetism and photoluminescence (PL) of spinel ferrites must be attractive especially in clinical medicine. We synthesized spinel ferrites containing Cd, Cu, and Cr, that is, Cd0.5Cu0.5Cr0.05Fe1.95O4 , by the chemical co-precipitation method; then the as-prepared material was sintered; these as-prepared and sintered materials were characterized using powder X-ray diffraction (powder XRD) and scanning electron microscopy (SEM); also, the physical properties were evaluated using vibrating sample magnetometry (VSM) and PL spectroscopy.
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