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Iron reduction and mineralization of deep‐sea iron reducing bacterium S hewanella piezotolerans WP 3 at elevated hydrostatic pressures
Author(s) -
Wu W. F.,
Wang F. P.,
Li J. H.,
Yang X. W.,
Xiao X.,
Pan Y. X.
Publication year - 2013
Publication title -
geobiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.859
H-Index - 72
eISSN - 1472-4669
pISSN - 1472-4677
DOI - 10.1111/gbi.12061
Subject(s) - magnetite , hydrostatic pressure , biomineralization , chemistry , greigite , mineralization (soil science) , deep sea , dissolution , superparamagnetism , mineralogy , geology , chemical engineering , materials science , metallurgy , oceanography , nitrogen , paleontology , physics , organic chemistry , thermodynamics , magnetization , quantum mechanics , magnetic field , engineering
In this study, iron reduction and concomitant biomineralization of a deep‐sea iron reducing bacterium ( IRB ), S hewanella piezotolerans WP 3, were systematically examined at different hydrostatic pressures (0.1, 5, 20, and 50 MPa). Our results indicate that bacterial iron reduction and induced biomineralization are influenced by hydrostatic pressure. Specifically, the iron reduction rate and extent consistently decreases with the increase in hydrostatic pressure. By extrapolation, the iron reduction rate should drop to zero by ~68 MPa, which suggests a possible shut‐off of enzymatic iron reduction of WP 3 at this pressure. Nano‐sized superparamagnetic magnetite minerals are formed under all the experimental pressures; nevertheless, even as magnetite production decreases, the crystallinity and grain size of magnetite minerals increase at higher pressure. These results imply that IRB may play an important role in iron reduction, biomineralization, and biogeochemical cycling in deep‐sea environments.