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. 2021 May 20;13(10):1670. doi: 10.3390/polym13101670

Figure 5.

Figure 5

(i) A model stacked oligomeric structure proposed for melanin. Figure adapted with permission from C. Chen, F. J. Martin-Martinez, G. S. Jung and M. J. Buehler, Chem. Sci., 2017, 8, 1631 under Creative Commons Attribution—Published by The Royal Society of Chemistry [22]. (ii) Real space images from TEM showing the stacking of the oligomers in both synthetic biomimetic versions and natural sources of melanin are also depicted. (a) Depicted is a low-resolution bright field transmission electron micrograph of synthetic melanin (scale bar: 50 nm). (b) A high-resolution bright field transmission electron micrograph of synthetic melanin (scale bar: 5 nm). (c) A high-resolution bright field transmission electron micrograph of synthetic melanin (scale bar: 5 nm). (d) A scaled radial power spectrum of (b) shown as solid black squares and (c) shown as open black squares. The narrow peaks in the spectra are centered at 3.9 A˚ and 3.7 A˚, respectively, for the images (b,c). Adapted from [42] with permission from The Royal Society of Chemistry.