Search Results - "Marchant, Hannah K."

Denitrifying community in coastal sediments performs aerobic and anaerobic respiration simultaneously by Marchant, Hannah K, Ahmerkamp, Soeren, Lavik, Gaute, Tegetmeyer, Halina E, Graf, Jon, Klatt, Judith M, Holtappels, Moritz, Walpersdorf, Eva, Kuypers, Marcel M M

“…Nitrogen (N) input to the coastal oceans has increased considerably because of anthropogenic activities, however, concurrent increases have not occurred in…”
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Terrestrial-type nitrogen-fixing symbiosis between seagrass and a marine bacterium by Mohr, Wiebke, Lehnen, Nadine, Ahmerkamp, Soeren, Marchant, Hannah K., Graf, Jon S., Tschitschko, Bernhard, Yilmaz, Pelin, Littmann, Sten, Gruber-Vodicka, Harald, Leisch, Nikolaus, Weber, Miriam, Lott, Christian, Schubert, Carsten J., Milucka, Jana, Kuypers, Marcel M. M.

“…Symbiotic N 2 -fixing microorganisms have a crucial role in the assimilation of nitrogen by eukaryotes in nitrogen-limited environments 1 – 3 . Particularly…”
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Single cell analyses reveal contrasting life strategies of the two main nitrifiers in the ocean by Kitzinger, Katharina, Marchant, Hannah K., Bristow, Laura A., Herbold, Craig W., Padilla, Cory C., Kidane, Abiel T., Littmann, Sten, Daims, Holger, Pjevac, Petra, Stewart, Frank J., Wagner, Michael, Kuypers, Marcel M. M.

“…Nitrification, the oxidation of ammonia via nitrite to nitrate, is a key process in marine nitrogen (N) cycling. Although oceanic ammonia and nitrite oxidation…”
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The fate of nitrate in intertidal permeable sediments by Marchant, Hannah K, Lavik, Gaute, Holtappels, Moritz, Kuypers, Marcel M M

“…Coastal zones act as a sink for riverine and atmospheric nitrogen inputs and thereby buffer the open ocean from the effects of anthropogenic activity…”
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Small sinking particles control anammox rates in the Peruvian oxygen minimum zone by Karthäuser, Clarissa, Ahmerkamp, Soeren, Marchant, Hannah K., Bristow, Laura A., Hauss, Helena, Iversen, Morten H., Kiko, Rainer, Maerz, Joeran, Lavik, Gaute, Kuypers, Marcel M. M.

“…Anaerobic oxidation of ammonium (anammox) in oxygen minimum zones (OMZs) is a major pathway of oceanic nitrogen loss. Ammonium released from sinking particles…”
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Purple sulfur bacteria fix N2 via molybdenum-nitrogenase in a low molybdenum Proterozoic ocean analogue by Philippi, Miriam, Kitzinger, Katharina, Berg, Jasmine S., Tschitschko, Bernhard, Kidane, Abiel T., Littmann, Sten, Marchant, Hannah K., Storelli, Nicola, Winkel, Lenny H. E., Schubert, Carsten J., Mohr, Wiebke, Kuypers, Marcel M. M.

“…Biological N 2 fixation was key to the expansion of life on early Earth. The N 2 -fixing microorganisms and the nitrogenase type used in the Proterozoic are…”
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Seasonality of Organic Matter Degradation Regulates Nutrient and Metal Net Fluxes in a High Energy Sandy Beach by Ahrens, Janis, Beck, Melanie, Marchant, Hannah K., Ahmerkamp, Soeren, Schnetger, Bernhard, Brumsack, Hans‐Jürgen

“…During seawater circulation in permeable intertidal sands, organic matter degradation alters the composition of percolating fluids and remineralization…”
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Cyanate and urea are substrates for nitrification by Thaumarchaeota in the marine environment by Kitzinger, Katharina, Padilla, Cory C., Marchant, Hannah K., Hach, Philipp F., Herbold, Craig W., Kidane, Abiel T., Könneke, Martin, Littmann, Sten, Mooshammer, Maria, Niggemann, Jutta, Petrov, Sandra, Richter, Andreas, Stewart, Frank J., Wagner, Michael, Kuypers, Marcel M. M., Bristow, Laura A.

“…Ammonia-oxidizing archaea of the phylum Thaumarchaeota are among the most abundant marine microorganisms 1 . These organisms thrive in the oceans despite…”
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Advection Drives Nitrate Past the Microphytobenthos in Intertidal Sands, Fueling Deeper Denitrification by Schutte, Charles A., Huanca-Valenzuela, Paulina, Lavik, Gaute, Marchant, Hannah K., de Beer, Dirk

“…Nitrification rates are low in permeable intertidal sand flats such that the water column is the primary source of nitrate to the sediment. During tidal…”
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The microbial nitrogen-cycling network by Kuypers, Marcel M. M., Marchant, Hannah K., Kartal, Boran

“…Key Points Nitrogen is an essential component of all living organisms and the main nutrient limiting life on our planet. Its availability depends on diverse…”
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Coupled nitrification-denitrification leads to extensive N loss in subtidal permeable sediments by Marchant, Hannah K., Holtappels, Moritz, Lavik, Gaute, Ahmerkamp, Soeren, Winter, Christian, Kuypers, Marcel M. M.

“…We investigated microbial pathways of nitrogen transformation in highly permeable sediments from the German Bight (South-East North Sea) by incubating sediment…”
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Response of benthic nitrogen cycling to estuarine hypoxia by Song, Guodong, Liu, Sumei, Zhang, Jing, Zhu, Zhuoyi, Zhang, Guiling, Marchant, Hannah K., Kuypers, Marcel M. M., Lavik, Gaute

“…The effects of bottom water oxygen concentration on sediment oxygen uptake, oxygen penetration depth, nitrate and ammonium fluxes, anammox, denitrification,…”
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Bloom of a denitrifying methanotroph, ‘Candidatus Methylomirabilis limnetica’, in a deep stratified lake by Graf, Jon S., Mayr, Magdalena J., Marchant, Hannah K., Tienken, Daniela, Hach, Philipp F., Brand, Andreas, Schubert, Carsten J., Kuypers, Marcel M. M., Milucka, Jana

“…Summary Methanotrophic bacteria represent an important biological filter regulating methane emissions into the atmosphere. Planktonic methanotrophic…”
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Rhizobia–diatom symbiosis fixes missing nitrogen in the ocean by Tschitschko, Bernhard, Esti, Mertcan, Philippi, Miriam, Kidane, Abiel T., Littmann, Sten, Kitzinger, Katharina, Speth, Daan R., Li, Shengjie, Kraberg, Alexandra, Tienken, Daniela, Marchant, Hannah K., Kartal, Boran, Milucka, Jana, Mohr, Wiebke, Kuypers, Marcel M. M.

“…Nitrogen (N 2 ) fixation in oligotrophic surface waters is the main source of new nitrogen to the ocean 1 and has a key role in fuelling the biological carbon…”
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Sulfide alters microbial functional potential in a methane and nitrogen cycling biofilm reactor by Delgado Vela, Jeseth, Bristow, Laura A., Marchant, Hannah K., Love, Nancy G., Dick, Gregory J.

“…Summary Cross‐feeding of metabolites between coexisting cells leads to complex and interconnected elemental cycling and microbial interactions. These…”
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Nitrate respiration and diel migration patterns of diatoms are linked in sediments underneath a microbial mat by Merz, Elisa, Dick, Gregory J., Beer, Dirk, Grim, Sharon, Hübener, Thomas, Littmann, Sten, Olsen, Kirk, Stuart, Dack, Lavik, Gaute, Marchant, Hannah K., Klatt, Judith M.

“…Summary Diatoms are among the few eukaryotes known to store nitrate (NO3−) and to use it as an electron acceptor for respiration in the absence of light and…”
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Rapid microbial diversification of dissolved organic matter in oceanic surface waters leads to carbon sequestration by Hach, Philipp F., Marchant, Hannah K., Krupke, Andreas, Riedel, Thomas, Meier, Dimitri V., Lavik, Gaute, Holtappels, Moritz, Dittmar, Thorsten, Kuypers, Marcel M. M.

“…The pool of dissolved organic matter (DOM) in the deep ocean represents one of the largest carbon sinks on the planet. In recent years, studies have shown that…”
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Metabolic specialization of denitrifiers in permeable sediments controls N2O emissions by Marchant, Hannah K., Tegetmeyer, Halina E., Ahmerkamp, Soeren, Holtappels, Moritz, Lavik, Gaute, Graf, Jon, Schreiber, Frank, Mussmann, Marc, Strous, Marc, Kuypers, Marcel M. M.

“…Summary Coastal oceans receive large amounts of anthropogenic fixed nitrogen (N), most of which is denitrified in the sediment before reaching the open ocean…”
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The effect of sediment grain properties and porewater flow on microbial abundance and respiration in permeable sediments by Ahmerkamp, Soeren, Marchant, Hannah K, Peng, Chao, Probandt, David, Littmann, Sten, Kuypers, Marcel M. M., Holtappels, Moritz

“…Sandy sediments cover 50–60% of the continental shelves and are highly efficient bioreactors in which organic carbon is remineralized and inorganic nitrogen is…”
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Simple approach for the preparation of (15-15)N2-enriched water for nitrogen fixation assessments: evaluation, application and recommendations by Klawonn, Isabell, Lavik, Gaute, Böning, Philipp, Marchant, Hannah K, Dekaezemacker, Julien, Mohr, Wiebke, Ploug, Helle

“…Recent findings revealed that the commonly used (15)N2 tracer assay for the determination of dinitrogen (N2) fixation can underestimate the activity of aquatic…”
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