title: Nanocrystalline todorokite-like manganese oxide produced by bacterial catalysis.
abstract: We describe the characterization of an unknown and difficult to identify but geochemically and environmentally significant MnOx structure produced by a freshwater bacterium, Leptothrix discophora SP-6, using combined transmission electron microscopy (TEM), extended X-ray absorption fine structure (EXAFS), and UV Raman spectroscopy. The large surface-to-volume ratio of the needle-shaped nanocrystalline MnO2 formed around the bacterial cells coupled to the porous, zeolite-like structure has the potential to catalyze reactions and oxidize and adsorb metals.
authors: Institute for Environmental Catalysis (IEC), Center for Catalysis and Surface Science (CCSS), Department of Chemistry, Northwestern University, Evanston, IL 60208, USA.
authors: Hack-Sung
authors: HS
authors: Kim
authors: Pablo A
authors: PA
authors: Pastén
authors: Jean-François
authors: JF
authors: Gaillard
authors: Peter C
authors: PC
authors: Stair
mesh_terms: D002384:Catalysis; D003460:Crystallization; D005583:Fourier Analysis; D042743:Leptothrix / Q000378:metabolism*; D017895:Manganese Compounds / Q000737:chemistry / Q000378:metabolism*; D010087:Oxides / Q000737:chemistry / Q000378:metabolism*; D013052:Spectrometry, X-Ray Emission; D013056:Spectrophotometry, Ultraviolet; D013059:Spectrum Analysis, Raman
chemical_list: D017895:Manganese Compounds; D010087:Oxides; C027424:manganese oxide