Trace-metal controls on microbial activity and biogeochemistry

Rai V, Fisher N, Duckworth OW and Baars O (2020) Extraction and Detection of Structurally Diverse Siderophores in Soil. Front. Microbiol. in-press, doi:

Reyes, C., L.H. Hodgskiss, O. Baars, M. Kerou, B. Bayer, C. Schleper, S. M. Kraemer. 2020. Copper limiting threshold in the terrestrial ammonia oxidizing archaeon Nitrososphaera viennensis, Res. Microbiol.,

Liang, R., M. C. Lau, O. Baars, F. T. Robb, T. C. Onstott. 2019. Aspartic acid racemization constrains long-term viability and longevity of endospores, FEMS Microbiol. Ecol., 95, fiz132

Zhang, X. *, O. Baars *, F. M. M. Morel, Genetic, structural, and functional diversity of low- and high-affinity siderophores in strains of nitrogen fixing Azotobacter chroococcum, Metallomics,
DOI:* authors contributed equally) <pdf>

McRose, D. L., A. Lee, S. H. Kopf, O. Baars, A. M. L. Kraepiel, D. M. Sigman, F. M. M. Morel, X. Zhang, Effect of Iron Limitation on the Isotopic Composition of Cellular and Released Fixed Nitrogen in Azotobacter vinelandii, Geochim. Cosmochim. Ac., 244, 2019, 12-23<pdf>

McRose, D. L., O. Baars, M. R. Seyedsayamdost, F. M. M. Morel, Quorum sensing and iron regulate a two-for-one siderophore gene cluster in Vibrio harveyi, Proc. Natl. Acad. Sci. USA, 2018,

Baars, O., F. M. M. Morel, X. Zhang, The purple non-sulfur bacterium Rhodopseudomonas palustris produces petrobactin related siderophores under aerobic and anaerobic conditions, Environ. Microbiol., 20, 2018, 1667-1676, <pdf>

Baars, O., X. Zhang, F. M. M. Morel, A. T. Stone, M. R. Seyedsayamdost, Crochelins, siderophores with a novel iron-chelating moiety from the nitrogen-fixing bacterium Azotobacter chroococcum, Angew. Chem. Int. Ed., 57, 2018, 536-541 , <pdf>

McRose, D. L., O. Baars, F. M. M. Morel, A. M. L. Kraepiel, Siderophore Production in Azotobacter vinelandii in Response to Fe-, Mo-, and V-Limitation. Environ. Microbiol., 19, 2017, 3595-3605, <pdf>

Baars, O., X. Zhang, F. M. M. Morel, M. R. Seyedsayamdost, 2015, The Siderophore Metabolome of Azotobacter vinelandii, Appl. Environ. Microbiol. 82, 2016, 27-39, <pdf>

Ocean trace-metal speciation, biogeochemistry, and primary productivity

Hellmer, H., M. Rhein, G. Heinemann, J. Abalichin, W. Abouchami, O. Baars, et al., Meteorology and Oceanography of the Atlantic sector of the Southern Ocean – a review of German achievements from the last decade. Ocean Dynam., 66, 2016, 1379-1413, <pdf>

Kim, J.-M., O. Baars, F. M. M. Morel, The effect of acidification on the bioavailability and electrochemical lability of zinc in seawater, Philos. T. Roy. Soc. A, 374, 2016, 2081, <pdf>

Kim, J.-M., O. Baars, F. M. M. Morel, Bioavailability and Electroreactivity of Zinc Complexed to Strong and Weak Organic Ligands, Environ. Sci. Technol., 49, 2015, 10894-10902 ,<pdf>

Mawji, E., R. Schlitzer, E. M. Dodas, C. Abadie, W. Abouchami, R. F. Anderson, O. Baars, et al., The GEOTRACES Intermediate Data Product 2014, Mar. Chem., 177, 2015, 1-8 ,<pdf>

Baars, O., P. L. Croot, Dissolved cobalt speciation and reactivity in the eastern tropical North Atlantic, Mar. Chem., 173, 2015, 310-319, <pdf>

Baars, O., W. Abouchami, S. J. G. Galer, M. Boye, P. L. Croot, Dissolved cadmium in the Southern Ocean: Distribution, speciation, and relation to phosphate, Limnol. Oceanogr., 59, 2014, 385-399, <pdf>

Baars, O., P. L. Croot, The speciation of dissolved Zinc in the Atlantic sector of the Southern Ocean, Deep Sea Res. Part II, 58, 2011, 720-2732, <pdf>

P. L. Croot, O. Baars, P. Streu, The distribution of dissolved Zinc in the Atlantic sector of the Southern Ocean. Deep Sea Res. Part II, 2010, 58, 2011, 2707-2719, <pdf>

Analytical Methods

Baars, O., D. H. Perlman, Small Molecule LC-MS/MS Fragmentation Data Analysis and Application to Siderophore Identification, 2016, Applications from Engineering with Matlab Concepts, Jan Valdeman (Ed.), InTech, ISBN 978-953-51-4663-6, <pdf>

Baars, O., F. M. M. Morel, D. H. Perlman, ChelomEx: Isotope-Assisted Discovery of Metal Chelates in Complex Media Using High-Resolution LC-MS, Anal. Chem., 86, 2014, 11298-11305 ,<pdf>

Pižeta, I., S. G. Sander, R. J. M. Hudson, D. Omanović, O. Baars, et al., Interpretation of complexometric titration data: An intercomparison of methods for estimating models of trace metal complexation by natural organic ligands, Mar. Chem., 173, 2015, 3-24 ,<pdf>

Baars, O., P. L. Croot, Comparison of Alternate Reactants for pM Level Cobalt Analysis in Seawater by the Use of Catalytic Voltammetry, Electroanalysis, 23, 2012, 1663-1670 ,<pdf>

Other publications
Klingele, J., M. H. Klingele, O. Baars, V. Lozan, A. Buchholz, G. Leibeling, W. Plass, F. Meyer, B. Kersting, Tetranuclear nickel(II) complexes composed of pairs of dinuclear LNi2 fragments linked by acetylenedicarboxylate, terephthalate, and isophthalate dianions: Synthesis, structures and magnetic properties, Eur. J. Inorg. Chem., 33, 2007, 5277-5285, <pdf>