The Genus Siderocapsa (and Other Iron- or Manganese-Oxidizing Eubacteria)

Hanert, Hans H.

doi:10.1007/978-1-4757-2191-1_74

Cited by 13 publications

(15 citation statements)

References 9 publications

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“…Mn‐oxidizers were cultivated on modified Beijerinck’s medium (Rodina, 1972; Havert, 1992). Two parts (A and B) of the medium were prepared separately.…”

Section: Methodsmentioning

confidence: 99%

Bacterial response to contrasting sediment geochemistry in the Central Indian Basin

et al. 2010

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In order to investigate whether geochemical, physiographic and lithological differences in two end-member sedimentary settings could evoke varied microbe-sediment interactions, two 25 cm long sediment cores from contrasting regions in the Central Indian Basin have been examined. Site TVBC 26 in the northern siliceous realm (10°S, 75AE5°E) is organic-C rich with 0AE3 ± 0AE09% total organic carbon. Site TVBC 08 in the southern pelagic red clay realm (16°S, 75AE5°E), located on the flank of a seamount in a mid-plate volcanic area with hydrothermal alterations of recent origin, is organic-C poor (0AE1 ± 0AE07%). Significantly higher bacterial viability under anaerobic conditions, generally lower microbial carbon uptake and higher numbers of aerobic sulphur oxidizers at the mottled zones, characterize core TVBC 26. In the carbon-poor environment of core TVBC 08, a doubling of the 14 C uptake, a 250 times increase in the number of autotrophic nitrifiers, a four-fold lowering in the number of aerobic sulphur oxidizers and a higher order of denitrifiers exists when compared with core TVBC 26; this suggests the prevalence of a potentially autotrophic microbial community in core TVBC 08 in response to hydrothermal activity. Microbial activity at the northern TVBC 26 is predominantly heterotrophic with enhanced chemosynthetic activity restricted to tan-green mottled zones. The southern TVBC 08 is autotrophic with increased heterotrophic activity in the deepest layers. Notably, the bacterial activity is generally dependent on the surface productivity in TVBC 26, the carbon-rich core, and mostly independent in TVBC 08, the carbon-poor, hydrothermally influenced core. The northern sediment is more organic sink-controlled and the southern sediment is more hydrothermal source-controlled. Hydrothermal activity and associated rock alteration processes may be more relevant than organic matter delivery in these deep-sea sediments. Thus, this study highlights the relative importance of hydrothermal activity versus organic delivery in evoking different microbial responses in the Central Indian Basin sediments.

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“…Mn‐oxidizers were cultivated on modified Beijerinck’s medium (Rodina, 1972; Havert, 1992). Two parts (A and B) of the medium were prepared separately.…”

Section: Methodsmentioning

confidence: 99%

Bacterial response to contrasting sediment geochemistry in the Central Indian Basin

et al. 2010

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“…While the origin of the manganese-rich material deposited on stainless steel coupons exposed to Bozeman streamwater was not rigorously established, mineral-encrusted bacterial sheaths characteristic of Leptothrix sp. (14) and mineralized toroidal capsules characteristic of Siderocapsa treubii (17) were abundant on the surface of the ennobled stainless steel coupons (11), and manganese-oxidizing bacteria were isolated from the manganese-rich deposits. While both genera are known to deposit manganese, principally in the sheaths and capsules, this ability is often lost during laboratory culturing, and efforts to obtain manganese-depositing axenic cultures of S. treubii have been unsuccessful (17).…”

mentioning

confidence: 99%

“…(14) and mineralized toroidal capsules characteristic of Siderocapsa treubii (17) were abundant on the surface of the ennobled stainless steel coupons (11), and manganese-oxidizing bacteria were isolated from the manganese-rich deposits. While both genera are known to deposit manganese, principally in the sheaths and capsules, this ability is often lost during laboratory culturing, and efforts to obtain manganese-depositing axenic cultures of S. treubii have been unsuccessful (17). A strain of Leptothrix discophora that maintains its ability to form sheaths in laboratory culture has recently been described (14).…”

mentioning

confidence: 99%

Ennoblement of Stainless Steel by the Manganese-Depositing Bacterium Leptothrix discophora

Dickinson¹,

Caccavo²,

Højris³

et al. 1997

Appl Environ Microbiol

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The noble shift in open-circuit potential exhibited by microbially colonized stainless steel (ennoblement) was investigated by examining the relationship among surface colonization, manganese deposition, and opencircuit potential for stainless steel coupons exposed to batch cultures of the manganese-depositing bacterium Leptothrix discophora. Open-circuit potential shifted from ؊100 to ؉330 mV SCE as a biofilm containing 75 nmol of MnO x cm ؊2 formed on the coupon surface but changed little further with continued MnO x deposition up to 270 nmol cm ؊2. Increased open-circuit potential corresponded to decreasing Mn(II) concentration in solution and to increased MnO x accumulation and attached cell density on the coupon surfaces. MnO x deposition was attributable to biological activity, and Mn(II) was observed to enhance cell attachment. The experimental results support a mechanism of ennoblement in which open-circuit potential is fixed near ؉350 mV SCE by the cathodic activity of biomineralized MnO x .

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“…Workers have also described a number of unicellular bacteria that form capsular layers that become encrusted with iron oxides. Most of these genera are classified in the family Siderocapsaceae (16,18); however, because of the variability in the appearance of the members of these genera and the limited availability of pure cultures, the taxonomic status of these organisms is even more uncertain than the taxonomic status of the stalked and sheathed bacteria.…”

mentioning

confidence: 99%

Investigation of an Iron-Oxidizing Microbial Mat Community Located near Aarhus, Denmark: Field Studies

Emerson

Revsbech

1994

Appl Environ Microbiol

219

105

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We investigated the microbial community that developed at an iron seep where anoxic groundwater containing up to 250 ,uM Fe2+ flowed out of a rock wall and dense, mat-like aggregations of ferric hydroxides formed at the oxic-anoxic interface. In situ analysis with oxygen microelectrodes revealed that the oxygen concentrations in the mat were rarely more than 50% of air saturation and that the oxygen penetration depth was quite variable, ranging from <0.05 cm to several centimeters. The bulk pH of the mat ranged from 7.1 to 7.6. There appeared to be a correlation between the flow rates at different subsites of the mat and the morphotypes of the microorganisms and Fe oxides that developed. In subsites with low flow rates (<2 ml/s), the iron-encrusted sheaths of Leptothrix ochracea predominated. Miniature cores revealed that the top few millimeters of the mat consisted primarily of L. ochracea sheaths, only about 7% of which contained filaments of cells. Deeper in the mat, large particulate oxides developed, which were often heavily colonized by unicellular bacteria that were made visible by staining with acridine orange. Direct cell counts revealed that the number

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The Genus Siderocapsa (and Other Iron- or Manganese-Oxidizing Eubacteria)

Cited by 13 publications

References 9 publications

Bacterial response to contrasting sediment geochemistry in the Central Indian Basin

Bacterial response to contrasting sediment geochemistry in the Central Indian Basin

Ennoblement of Stainless Steel by the Manganese-Depositing Bacterium Leptothrix discophora

Investigation of an Iron-Oxidizing Microbial Mat Community Located near Aarhus, Denmark: Field Studies

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