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23 results on '"Ciobota, Valerian"'

13. Microbial Fe(II) oxidation bySideroxydans lithotrophicusES-1 in the presence of Schlöppnerbrunnen fen-derived humic acids

Author

Hädrich, Anke, primary, Taillefert, Martial, additional, Akob, Denise M, additional, Cooper, Rebecca E, additional, Litzba, Ulrike, additional, Wagner, Friedrich E, additional, Nietzsche, Sandor, additional, Ciobota, Valerian, additional, Rösch, Petra, additional, Popp, Jürgen, additional, and Küsel, Kirsten, additional

Published
2019
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16. A possible mechanism for the emergence of an additional band gap due to a Ti–O–C bond in the TiO2–graphene hybrid system for enhanced photodegradation of methylene blue under visible light

Author

Umrao, Sima, primary, Abraham, Shiju, additional, Theil, Frank, additional, Pandey, Shobhit, additional, Ciobota, Valerian, additional, Shukla, P. K., additional, Rupp, Caroline J., additional, Chakraborty, Sudip, additional, Ahuja, Rajeev, additional, Popp, Jürgen, additional, Dietzek, Benjamin, additional, and Srivastava, Anchal, additional

Published
2014
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22. Microbial Fe(II) oxidation by Sideroxydans lithotrophicus ES-1 in the presence of Schlöppnerbrunnen fen-derived humic acids.

Author

Hädrich, Anke, Taillefert, Martial, Akob, Denise M, Cooper, Rebecca E, Litzba, Ulrike, Wagner, Friedrich E, Nietzsche, Sandor, Ciobota, Valerian, Rösch, Petra, Popp, Jürgen, and Küsel, Kirsten

Subjects
IRON oxidation, HUMIC acid, DISSOLVED organic matter, OXIDATION, CARBON cycle
Abstract

Controlled laboratory experiments were combined with field measurements to better understand the interactions between dissolved organic matter (DOM) and reduced iron in organic-rich peatlands. Addition of peat-derived humic acid extract (HA) to Sideroxydans lithotrophicus ES-1 liquid cultures led to higher cell numbers and up to 1.4 times higher Fe(II) oxidation rates compared to chemical controls. This effect was positively correlated with increasing HA concentrations. Similar Fe(III) (oxyhydr)oxide mineralogies were formed both abiotically and biotically irrespective of HA amendment, but minerals formed in the presence of ES-1 and HA were smaller. ES-1 growth with HA promoted aggregation of Fe(III) products in agarose-stabilized gradient tubes as shown by voltammetric profiling. In situ voltammetry in an acidic, iron-rich peatland revealed a gap between oxygen penetration and iron reduction that may reflect active Fe(II)-oxidizing microorganisms. The highest abundance of Fe(II) oxidizers Sideroxydans (4.9 × 107 gene copies gww−1) and Gallionella (1.5 × 107 gene copies gww−1) in the upper peat layer coincided with small-sized minerals resembling nanoparticulate ferrihydrite or goethite. Our results suggest that microbially mediated Fe(II) oxidation dominates in the presence of DOM leading to the formation of nano-sized biogenic Fe(III) (oxyhydr)oxides that might be readily bioavailable and likely important to iron and carbon cycling. [ABSTRACT FROM AUTHOR]

Published
2019
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23. The Influence of Intracellular Storage Material on Bacterial Identification by means of Raman Spectroscopy.

Author

Ciobota, Valerian, Burkhardt, Eva-Maria, Schumacher, Wilm, Roesch, Petra, Kuesel, Kirsten, and Popp, Juergen

Subjects
*RAMAN spectroscopy, *MICROORGANISMS, *BACTERIA, *MICROBIOLOGY, *RESEARCH
Abstract

The article reports on the usefulness of micro-Raman spectroscopy technique for identifying microorganisms. It is stated that, the advantages of the technique includes, its non-invasive character, minimal or no sample preparation requirements, and only one bacterial cell is required to record the fingerprint Raman spectrum which is used for microbial identification.

Published
2010
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