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Transient development of filamentous Thiothrix species in a marine sulfide oxidizing, denitrifying fluidized bed reactor

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Gieseke,  A.
Permanent Research Group Microsensor, Max Planck Institute for Marine Microbiology, Max Planck Society;

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Citation

Cytryn, E., Minz, D., Gieseke, A., & van Rijn, J. (2006). Transient development of filamentous Thiothrix species in a marine sulfide oxidizing, denitrifying fluidized bed reactor. FEMS Microbiology Letters, 256(1), 22-29.


Cite as: http://hdl.handle.net/21.11116/0000-0001-CF85-0
Abstract
In this study, microscopic and molecular microbial analyses were integrated to characterize rapidly developing white filamentous tufts in a fluidized bed reactor used for nitrate removal from a marine recirculating fish culture system. Formation and rapid elongation of the tufts (often exceeding 50 mm day −1) was strongly correlated to transient elevated sulfide concentrations (>50 μM) in the reactor. The dominant bacterial constituents of these tufts were filamentous gram-negative bacteria with densely packed intracellular sulfur granules. Using 16S rRNA gene analysis and fluorescence in situ hybridization it was found that these filamentous bacteria represented a novel Thiothrix phylotype closely related (97% sequence identity) to a previously identified Thiothrix strain endogenous to the marine crustacean Urothoe poseidonis. In addition to filamentous morphotypes, rosette-shaped morphotypes of Thiothrix were also detectable within the tufts.