Journal: Frontiers in Microbiology

Article Title: Metabolic adaptation of a methanogen to a ferruginous environment associated with intracellular Fe- and S-rich nanoparticles

doi: 10.3389/fmicb.2026.1967823

Figure Lengend Snippet: X-ray diffraction patterns of synthesized mackinawite.

Article Snippet: The XRD was used to analyze the mineralogy of the synthetic mackinawite with a Rigaku Smart lab X-ray powder diffractometer (Rigaku, Japan) employing Cu Kα radiation at 40 kV and 200 mA.

Techniques: Synthesized

Journal: Frontiers in Microbiology

Article Title: Metabolic adaptation of a methanogen to a ferruginous environment associated with intracellular Fe- and S-rich nanoparticles

doi: 10.3389/fmicb.2026.1967823

Figure Lengend Snippet: Transmission electron microscopy (TEM), high-resolution TEM (HRTEM), fast Fourier transform (FFT), and energy-dispersive X-ray spectroscopy (EDS) analyses of mackinawite under different Fe 2+ and HS − conditions. The TEM images in the top row show (A) 50 µM FeS Mack alone, (B) 50 µM FeS Mack supplemented with 250 µM Fe 2+ , and (C) 50 µM FeS Mack supplemented with 250 µM HS − . The corresponding HRTEM images, FFT patterns, and EDS spectra are shown below each TEM image in the same column. TEM images show the general morphology, while HRTEM images reveal lattice fringes corresponding to specific crystallographic planes. Together, these analyses support the identification of the material as nanocrystalline mackinawite.

Article Snippet: The XRD was used to analyze the mineralogy of the synthetic mackinawite with a Rigaku Smart lab X-ray powder diffractometer (Rigaku, Japan) employing Cu Kα radiation at 40 kV and 200 mA.

Techniques: Transmission Assay, Electron Microscopy, High-Resolution TEM, Energy Dispersive X-Ray, Spectroscopy, Morphology