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Jördis Stühren­berg

PhD student

Department of Biogeochemistry

MPI for Marine Microbiology
Celsiusstr. 1
D-28359 Bremen
Germany

Room: 

3222

Phone: 

+49 421 2028-8301

Jördis Stührenberg

Ni­tro­gen (N) is an es­sen­tial mac­ronu­tri­ent for all liv­ing be­ings and a key pro­cess in the ni­tro­gen cycle is ni­tri­fic­a­tion, a two-step path­way ox­id­iz­ing am­mo­nia over ni­trite to ni­trate. Throughout the global ocean, however, the avail­ab­il­ity of com­pounds like am­mo­nia and ni­trate is not con­sist­ent. Con­trary, the dis­tri­bu­tion of dis­solved or­ganic ni­tro­gen (DON) is rather ho­mo­gen­ous.

My re­search is about ni­tri­fi­ers and their us­age of DON com­pounds as sub­strates (e.g. N source and/​or en­ergy source). I am par­tic­u­larly in­ter­ested in am­monium-lim­ited ocean re­gions, where the re­l­at­ive im­port­ance of DON is high.

My main tech­niques in­clude:

  • Stable iso­tope in­cub­a­tions to quantify the bulk oxidation rates
  • Visualisation of microorganisms with CARD-FISH
  • Analysis of metagenomes and metatranscriptomes to investigate the genetic potential of the nitrifiers
  • nanoSIMS measurements to quantify uptake of substrates by nitrifiers
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