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Size-dependent structural evolution of the biomineralized iron-core nanoparticles in ferritins
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View: Figures


Image of FIG. 1.
FIG. 1.

(Top) Schematic diagram of a ferritin molecule. (Bottom) Three ferritin molecules according to the amount of Fe contents. With increasing Fe content in the ferritin core, the biomineralization changes from maghemite-like (γ-Fe2O3) formation to hematite-like (α-Fe2O3) formation. Green-colored Fe-oxide schematically represents hematite, while yellow-colored one represents maghemite.

Image of FIG. 2.
FIG. 2.

(a) Fe XAS and (b) XMCD spectra of apo, intermediate-state (I-S), and high-state (H-S) Hpf crystals, in comparison to those of reference Fe oxides. (c) Intensity plots of I(A)/I(B) in the L 3 part of Fe XAS. The shoulder (A) and the main peak (B) are labeled in (a). (d) and (e) Intensity plots of I(α)/I(γ) and I(β)/ I(γ) in Fe XMCD. The peaks of α, β, γ are labeled in (b). I(α) and I(γ) are the dichroism signals of B(Oh ) sites, and I(β) is that of A(Td ) site.

Image of FIG. 3.
FIG. 3.

Calculation versus experiment: Comparison of the measured Fe XAS and XMCD spectra of H-S, I-S, and apo ferritins (top three curves) to the calculated spectra (lower four curves), obtained from the crystal field multiplet calculations. The labels of O and T represent the octahedral symmetry and the tetrahedra symmetry, respectively.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Size-dependent structural evolution of the biomineralized iron-core nanoparticles in ferritins