Sökning: L773:0149 0451 OR L773:1521 0529 > (2015-2019) > Fragmentation of Ba...
Fältnamn | Indikatorer | Metadata |
---|---|---|
000 | 03490naa a2200385 4500 | |
001 | oai:research.chalmers.se:2da01f7f-446f-42cf-b9e1-596ec0d44952 | |
003 | SwePub | |
008 | 171008s2015 | |||||||||||000 ||eng| | |
024 | 7 | a https://research.chalmers.se/publication/2237562 URI |
024 | 7 | a https://doi.org/10.1080/01490451.2014.8977752 DOI |
040 | a (SwePub)cth | |
041 | a engb eng | |
042 | 9 SwePub | |
072 | 7 | a art2 swepub-publicationtype |
072 | 7 | a ref2 swepub-contenttype |
100 | 1 | a Ferris, F. G.u University of Toronto4 aut |
245 | 1 0 | a Fragmentation of Bacteriogenic Iron Oxides in Response to Hydrodynamic Shear Stress |
264 | c 2015-08-19 | |
264 | 1 | b Informa UK Limited,c 2015 |
520 | a A viscous shear stress of 1.97 Nm2 was applied to suspensions of freshwater, brackish and marine bacteriogenic iron oxides (BIOS) in shake flasks. Samples were taken at intervals over 480 minutes for scanning electron microscopy. The remains of three Fe2+-oxidizing bacteria (FeOB) genera were conspicuous biomass constituents in the BIOS samples; these included the filamentous extracellular sheaths of Leptothrix, as well as helical fibrous stalks of Gallionella and Mariprofundus. The applied hydrodynamic shear stress resulted in an exponential decrease in Leptothrix sheath and Gallionella-Mariprofundus stalk lengths; first-order breakage rate constants derived from the experimental measurements ranged from 0.009 to 0.023 min−1 and 0.014 to 0.021 min��1, respectively. Breakage half-times extended from 30 to 70 min. Shear strength values calculated from the time course data ranged from 27.8 to 29.6 Nm−2 for Leptothrix sheaths, and from 28.0 to 28.8 Nm−2 for Gallionella-Mariprofundus stalks. Computational analyses showed that breakage half-times decreased rapidly with increasing shear stress, implying that the accumulation of BIOS is constrained hydrodynamically to quiescent aqueous environments. These results imply that there is considerable potential for natural hydrodynamic fluctuations in basal shear stress levels to bring about resuspension and advective dispersal of BIOS. Immediate consequences anticipated from such events include enhanced particulate transport of BIOS-associated chemical species through aquatic systems, as well as reduced preservation potential and underrepresentation of BIOS bacteria structures as microfossils in the geological record. | |
650 | 7 | a NATURVETENSKAPx Kemix Annan kemi0 (SwePub)104992 hsv//swe |
650 | 7 | a NATURAL SCIENCESx Chemical Sciencesx Other Chemistry Topics0 (SwePub)104992 hsv//eng |
650 | 7 | a NATURVETENSKAPx Geovetenskap och miljövetenskapx Geologi0 (SwePub)105042 hsv//swe |
650 | 7 | a NATURAL SCIENCESx Earth and Related Environmental Sciencesx Geology0 (SwePub)105042 hsv//eng |
653 | a shear stress | |
653 | a hydrodynamic | |
653 | a fragmentation | |
653 | a bacterial iron oxides | |
700 | 1 | a James, R. E.u University of Toronto4 aut |
700 | 1 | a Pedersen, Karsten,d 1952u Chalmers tekniska högskola,Chalmers University of Technology4 aut0 (Swepub:cth)karped |
710 | 2 | a University of Torontob Chalmers tekniska högskola4 org |
773 | 0 | t Geomicrobiology Journald : Informa UK Limitedg 32:7, s. 564-569q 32:7<564-569x 0149-0451x 1521-0529 |
856 | 4 | u http://dx.doi.org/10.1080/01490451.2014.897775y FULLTEXT |
856 | 4 8 | u https://research.chalmers.se/publication/223756 |
856 | 4 8 | u https://doi.org/10.1080/01490451.2014.897775 |
Kungliga biblioteket hanterar dina personuppgifter i enlighet med EU:s dataskyddsförordning (2018), GDPR. Läs mer om hur det funkar här.
Så här hanterar KB dina uppgifter vid användning av denna tjänst.
Kopiera och spara länken för att återkomma till aktuell vy