Open AccessKinetics of sulfate respiration by free‐living and particle‐associated sulfate‐reducing bacteria
Author(s) -
Fukui Manabu,
Takii Susumu
Publication year - 1994
Publication title -
fems microbiology ecology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.377
H-Index - 155
eISSN - 1574-6941
pISSN - 0168-6496
DOI - 10.1111/j.1574-6941.1994.tb00071.x
Subject(s) - sulfate , desulfovibrio , sulfate reducing bacteria , sulfide , bacteria , respiration , biology , kinetics , biochemistry , environmental chemistry , hydrogen sulfide , sulfur , inorganic chemistry , chemistry , botany , organic chemistry , genetics , physics , quantum mechanics
Effects on sulfate respiration of association of sulfate‐reducing bacteria (SRB) with solid particles (anion exchange resin and FeS‐precipitate) were examined using Desulfovibrio desulfuricans . The rates of sulfide production by resin‐ and FeS‐associated cells were 2–3% and 19–56% of that by free‐living ones, respectively, under sulfate‐ and lactate‐rich conditions. On the other hand, under sulfate‐poor (less than 50 μM) and lactate‐rich conditions the rate by FeS‐associated cells was higher than that by free‐living ones. The values of K m (μM), half saturation constant of the Michaelis‐Menten model, for sulfate were 244 for free‐living cells, 8.96 for resin‐associated ones and 8.42 for FeS‐associated ones. Under lactate‐poor and sulfate‐rich conditions the rate by FeS‐associated cells was similar to that by free‐living ones. These results suggest that FeS‐associated SRB are more advantageous than free‐living ones under sulfate‐poor environments such as freshwater sediments.