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Holmström, Sara J M
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Publications (10 of 25) Show all publications
Duckworth, O. W., Holmström, S. J., Peña, J. & Sposito, G. (2009). Biogeochemistry of iron oxidation in a circumneutral freshwater habitat. Chemical Geology, 260(3-4), 149-158
Open this publication in new window or tab >>Biogeochemistry of iron oxidation in a circumneutral freshwater habitat
2009 (English)In: Chemical Geology, ISSN 0009-2541, E-ISSN 1872-6836, Vol. 260, no 3-4, p. 149-158Article in journal (Refereed) Published
Abstract [en]

Iron(II) oxidation in natural waters at circumneutral pH, often regarded as an abiotic process, is frequently biologically mediated at iron-rich redox gradients. West Berry Creek, a small circumneutral tributary that flows through a mixed coniferous forest in Big Basin State Park, California, contains localized iron (hydr)oxide precipitates at points along its course where anoxic groundwater meets oxygenated creek water. These mixing zones establish redox gradients that may be exploited by microbes forming microbial mats that are intimately associated with iron (hydr)oxide precipitates. Water sampling revealed strong correlations between the concentrations of aqueous inorganic species, suggesting a rock-weathering source for most of these solutes. Liquid chromatography-electrospray ionization-mass spectrometry techniques detected significant concentrations of organic exudates, including low molecular mass organic acids and siderophores, indicating that active biogeochemical cycling of iron is occurring in the creek. X-ray diffraction and elemental analysis showed the precipitates to be amorphous, or possibly poorly crystalline, iron-rich minerals. Clone libraries developed from 16S rDNA sequences extracted from microbial mat communities associated with the precipitates revealed the presence of microorganisms related to the neutrophilic iron oxidizing bacteria Gallionella and Sideroxydans. Sequences from these libraries also indicated the presence of significant populations of organisms related to bacteria in the genera Aquaspirillum, Pseudomonas, Sphingomonas, and Nitrospira. These geosymbiotic systems appear to be significant not only for the biogeochemical cycling of iron in the creek, but also for the cycling of organic species, inorganic nutrients, and trace metals.

National Category
Chemical Sciences
Identifiers
urn:nbn:se:miun:diva-8323 (URN)10.1016/j.chemgeo.2008.08.027 (DOI)000264957600001 ()2-s2.0-60749134694 (Scopus ID)
Available from: 2009-01-19 Created: 2009-01-19 Last updated: 2017-12-14Bibliographically approved
Holmström, S. J., Rosling, A., Finlay, R. D., van Hees, P. A. & Lundström, U. (2009). Contribution of ectomycorrhizal fungi to biogeochemical processes during iron and calcium limitation: Meeting abstract. In: GEOCHIMICA ET COSMOCHIMICA ACTA. Paper presented at 19th Annual VM Goldschmidt Conference, Jun 21, 2009, Davos, Switzerland (pp. A546-A546). Pergamon Press
Open this publication in new window or tab >>Contribution of ectomycorrhizal fungi to biogeochemical processes during iron and calcium limitation: Meeting abstract
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2009 (English)In: GEOCHIMICA ET COSMOCHIMICA ACTA, Pergamon Press, 2009, p. A546-A546Conference paper, Published paper (Refereed)
Place, publisher, year, edition, pages
Pergamon Press, 2009
Series
GEOCHIMICA ET COSMOCHIMICA ACTA, ISSN 0016-7037 ; 73 Suppl
National Category
Other Basic Medicine
Identifiers
urn:nbn:se:miun:diva-11842 (URN)000267229901327 ()
Conference
19th Annual VM Goldschmidt Conference, Jun 21, 2009, Davos, Switzerland
Available from: 2010-07-14 Created: 2010-07-14 Last updated: 2018-01-12Bibliographically approved
Essén, S., Bylund, D., Holmström, S., Moberg, M. & Lundström, U. (2006). Quantification of hydroxamate siderophores in soil solutions of podzolic soil profiles in Sweden. Biometals, 19(3), 269-282
Open this publication in new window or tab >>Quantification of hydroxamate siderophores in soil solutions of podzolic soil profiles in Sweden
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2006 (English)In: Biometals, ISSN 0966-0844, E-ISSN 1572-8773, Vol. 19, no 3, p. 269-282Article in journal (Refereed) Published
Abstract [en]

Concentrations up to 2 and 12 nM of the hydroxamate siderophores ferrichrome and ferricrocin, respectively, were identified in soil solutions of podzolic forest soils at four sites in both northern and southern Sweden. No ferrichrysin was detected. As with the dissolved organic carbon and low molecular mass organic acids, the highest concentrations of the siderophores were found in the upper layers i.e. the mor layer, the eluvial and upper illuvial horizons. At the southern sites, the concentrations of ferrichrome and ferricrocin were both of similar magnitude and did not differ between the two sites. In contrast, soil solutions at the two northern sites contained more ferricrocin than ferrichrome; the ferricrocin concentrations were also higher at the northern sites than at the southern sites. Analyses were performed by high performance liquid chromatography with a porous graphitic carbon column on which ferrichrome, ferricrocin and ferrichrysin were separated. Detection by electrospray ionization mass spectrometry (ESI-MS) combined with on-line sample pre-concentration, by means of column-switching, enabled detection limits of 0.1-0.2 nM for ferrichrome, ferrichrysin and ferricrocin. The structural identities of the siderophores were further verified by MS/MS fragmentation. Fragmentation of ferrichrome, ferricrocin and ferrichrysin occured mainly via peptide cleavage. The most intense fragments were typified by the loss of one of the three iron(III) chelating hydroxamate residues, i.e N5-acyl-N5-hydroxy ornithine.

Keywords
ferrichrome, siderophores, chromatography, mass spectrometry, soil
National Category
Chemical Sciences
Identifiers
urn:nbn:se:miun:diva-3240 (URN)10.1007/s10534-005-8418-8 (DOI)000238531400006 ()16799865 (PubMedID)2-s2.0-33745380720 (Scopus ID)3193 (Local ID)3193 (Archive number)3193 (OAI)
Note

VR-Environmental Health

Available from: 2008-09-30 Created: 2009-05-07 Last updated: 2017-12-12Bibliographically approved
Holmström, S. (2006). Siderophore promoted dissolution of goethite: Effects of Mn substitution. In: The 232nd ACS National Meeting San Francisco, CA, USA, September 10-14, 2006: .
Open this publication in new window or tab >>Siderophore promoted dissolution of goethite: Effects of Mn substitution
2006 (English)In: The 232nd ACS National Meeting San Francisco, CA, USA, September 10-14, 2006, 2006Conference paper, Published paper (Refereed)
Keywords
manganese, goethite, siderophores, dissolution
National Category
Chemical Sciences
Identifiers
urn:nbn:se:miun:diva-4546 (URN)5646 (Local ID)5646 (Archive number)5646 (OAI)
Available from: 2008-12-16 Created: 2008-12-16Bibliographically approved
Holmström, S. (2006). Structure and reactivity of bacteriogenic Mn oxides exposed at different pH. In: The 232nd ACS National Meeting San Francisco, CA, USA, September 10-14, 2006: .
Open this publication in new window or tab >>Structure and reactivity of bacteriogenic Mn oxides exposed at different pH
2006 (English)In: The 232nd ACS National Meeting San Francisco, CA, USA, September 10-14, 2006, 2006Conference paper, Published paper (Refereed)
Keywords
Manganese oxid, Pseudomonas Putida, Bacillus, biogenic oxides, structure, rectivity, pH
National Category
Chemical Sciences
Identifiers
urn:nbn:se:miun:diva-4547 (URN)5647 (Local ID)5647 (Archive number)5647 (OAI)
Available from: 2008-12-16 Created: 2008-12-16 Last updated: 2009-05-07Bibliographically approved
Holmström, S. (2006). Systematic study of the effect of pH on the structure and reactivity of Mn oxide produced by Bacillus sp., strain SG-1. In: XAFS13, Stanford University, Stanford, CA, USA. July 9-14, 2006: .
Open this publication in new window or tab >>Systematic study of the effect of pH on the structure and reactivity of Mn oxide produced by Bacillus sp., strain SG-1
2006 (English)In: XAFS13, Stanford University, Stanford, CA, USA. July 9-14, 2006, 2006Conference paper, Published paper (Refereed)
Keywords
Manganese oxid, Pseudomonas Putida, Bacillus, biogenic oxides, structure, rectivity, pH
National Category
Chemical Sciences
Identifiers
urn:nbn:se:miun:diva-4545 (URN)5645 (Local ID)5645 (Archive number)5645 (OAI)
Available from: 2008-12-16 Created: 2008-12-16 Last updated: 2009-05-07Bibliographically approved
De la Rosa, M. P., Holmström, S. J. M., Sposito, G., Tebo, B. M. & Bargar, J. (2006). Systematic study of the effect of pH on the structure and reactivity of Mn oxide produced by Bacillus sp., strain SG-1: Gordon Research Conferences - Environmental Bioinorganic Chemistry 2006. Proctor Academy , Andover, NH, USA, 18-23 June, 2006 ; Poster. In: : .
Open this publication in new window or tab >>Systematic study of the effect of pH on the structure and reactivity of Mn oxide produced by Bacillus sp., strain SG-1: Gordon Research Conferences - Environmental Bioinorganic Chemistry 2006. Proctor Academy , Andover, NH, USA, 18-23 June, 2006 ; Poster
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2006 (English)Conference paper, Published paper (Refereed)
Keywords
Manganese oxid, Pseudomonas Putida, Bacillus, biogenic oxides, structure, rectivity, pH
National Category
Chemical Sciences
Identifiers
urn:nbn:se:miun:diva-5208 (URN)5644 (Local ID)5644 (Archive number)5644 (OAI)
Available from: 2008-09-30 Created: 2008-09-30Bibliographically approved
Holmström, S. J. M. & Sposito, G. (2005). Siderophore promoted dissolution of a series of Mn-substituted goethites: AGU (American Geological Union) 2005 Fall Meeting San Francisco, USA, 5-9 December 2005; Oral presentation.
Open this publication in new window or tab >>Siderophore promoted dissolution of a series of Mn-substituted goethites: AGU (American Geological Union) 2005 Fall Meeting San Francisco, USA, 5-9 December 2005; Oral presentation
2005 (English)Conference paper, Published paper (Refereed)
Keywords
siderophores, goethite, dissolution
National Category
Chemical Sciences
Identifiers
urn:nbn:se:miun:diva-1095 (URN)5643 (Local ID)5643 (Archive number)5643 (OAI)
Available from: 2008-09-30 Created: 2008-09-30Bibliographically approved
Moberg, M., Nilsson, E. M., Holmström, S., Lundström, U., Pettersson, J. & Markides, K. (2004). Fingerprinting metal-containing biomolecules after reductive displacement of iron by gallium and subsequent column-switched LC-ICP-MS analysis applied on siderophore.. Analytical Chemistry, 76(9), 2618-2622
Open this publication in new window or tab >>Fingerprinting metal-containing biomolecules after reductive displacement of iron by gallium and subsequent column-switched LC-ICP-MS analysis applied on siderophore.
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2004 (English)In: Analytical Chemistry, ISSN 0003-2700, E-ISSN 1520-6882, Vol. 76, no 9, p. 2618-2622Article in journal (Refereed) Published
Abstract [en]

Column-switching liquid chromatography followed by lowresolution ICPMS was evaluated as a tool for speciation analysis of metal-containing biomolecules. The strategy was applied on siderophores, strong iron chelators of low molecular weight (M-w < 1500). Prior to the LC-ICPMS analysis, reductive displacement of iron by gallium was performed using ascorbate as the reducing agent to increase the sensitivity. Different experimental conditions during the exchange reaction were tested using ferrichrysin and ferrichrome for evaluation. A reaction time of 30 min and a pH of 3.9 gave an exchange yield of 27 and 83% for ferrichrysin and ferrichrome, respectively. A gradient elution profile was also developed to separate gallium-chelated siderophores on a PGC column. Detection limits for standard solutions of ferrichrysin and ferrichrome in the low-nanomolar range were obtained by monitoring the gallium-69 isotope. The combined use of LC-ICPMS and LC-ESI-MS/MS was also evaluated as a tool to identify unknown metal complexes, here siderophores, in field soil solution samples.

Keywords
LC-ICP-MS, siderophores, biomolecules
National Category
Chemical Sciences
Identifiers
urn:nbn:se:miun:diva-2535 (URN)10.1021/ac0355000 (DOI)000221205900036 ()1797 (Local ID)1797 (Archive number)1797 (OAI)
Available from: 2008-09-30 Created: 2008-09-30 Last updated: 2017-12-12Bibliographically approved
van Hees, P. A., Jones, D. L., Nyberg, L., Holmström, S., Godbold, D. L. & Lundström, U. (2004). Modelling low molecular weight organic acid dynamics in forest soils. Soil Biology and Biochemistry, 37(3), 517-531
Open this publication in new window or tab >>Modelling low molecular weight organic acid dynamics in forest soils
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2004 (English)In: Soil Biology and Biochemistry, ISSN 0038-0717, E-ISSN 1879-3428, Vol. 37, no 3, p. 517-531Article in journal (Refereed) Published
Abstract [en]

Low molecular weight organic acids such as citrate and oxalate have been hypothesized to play a key role in rhizosphere ecology and pedogenesis. A mathematical site-specific model, DYNLOW, was constructed to describe the temporal and spatial dynamics of these organic acids in coniferous forest soils using the modelling software STELLA®. Experimentally derived values for biodegradation, adsorption, and daily values of soil temperature, moisture and hydrological flow were used to parameterize the model. The model describes the dynamics and downward movement of oxalate and citrate through the horizons (O, AE, E, Bhs, Bs) of three podzolic soil profiles in Sweden. After calibration, the model predicted average soil solution organic acid concentrations ranging from <1 to 90 μM, which was in agreement with experimental measurements (<1 to 116 μM). The model results indicated that microbial degradation of organic acids was in quantitative terms the biggest process regulating soil solution concentrations. Primary production rates of organic acid in the soil were predicted to be high (<1 to 1250 nmol g−1 soil d−1) in comparison to the amount present at steady state in the soil solution pool (<0.1 to 240 nmol g−1 soil). The downward transfer of organic acids between soil horizons due to mass flow was predicted to be a small flux (<0.1 to 3% of the total loss) compared to that lost by microbial biodegradation. The model predicted that the amount of basal soil respiration that could be attributable to the microbial turnover of organic acids was on average 19±22% of the basal CO2 production across all sites and horizons for citrate and 7±7% for oxalate. The model results are discussed in the context of pedogenesis, forest soil respiration and organic matter production.

Keywords
low molecular weight organic acids, modelling, forest soil
National Category
Chemical Sciences
Identifiers
urn:nbn:se:miun:diva-2538 (URN)10.1016/j.soilbio.2004.08.014 (DOI)000226561500012 ()1799 (Local ID)1799 (Archive number)1799 (OAI)
Available from: 2008-09-30 Created: 2008-09-30 Last updated: 2017-12-12Bibliographically approved
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