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Recently defended

Carolin Otersen

Defense Carolin Otersen
Congratulations: Carolin got her hat! (from left to right: Prof. Dr. Matthias Ullrich, PD Dr. Eva Spieck, Dr. Bram Vekeman, Carolin Otersen, Dr. Boran Kartal, Prof. Dr. Marcel Kuypers) © MPIMM

Carolin Otersen

Department: Biogeochemistry

Exam Date: Monday, August 31, 2026

Topic of the dissertation:

"Cultivation and characterization of marine ammonia-oxidizing archaea associated with Posidonia oceanica"

Mertcan Esti

Defense Mertcan Esti
Congratulations Mertcan! (from left to right: Dr. Jana Milucka, Laura Przybylek, Prof. Dr. Wolfgang Bach, Dr. Wiebke Mohr, Me (Mertcan Esti), Prof. Dr. Marcel Kuypers and Assoc. Prof. Dr. Dagmar Woebken) © MPIMM

Mertcan Esti

Department: Biogeochemistry

Exam Date: Friday, July 17, 2026

Topic of the dissertation:

"Hidden symbioses sustaining nitrogen fixation in oligotrophic oceans"

Juliane Schötz

Defense Juliane Schötz
Congratulations Juliane! (from left to right: Dr. Wiebke Mohr, Paul Mock, Prof. Dr. Marcel Kuypers, Juliane Schötz, Dr. Jana Milucka, Dr. Florence Schubotz) © G. Lavik/MPIMM

Juliane Schötz

Department: Biogeochemistry

Exam Date: Thursday, July 16, 2026

Topic of the dissertation:

"Controls on microbial methylphosphonate utilisation in the oligotrophic Medterranean Sea"

Jaagni Parnami

Defense Jaagni Parnami
Jaagni puts on her hat! (In the photo: Jaagni Parnami, Prof. Dr. Jan-Hendrik Hehemann (reviewer). Not pictured: Prof. Dr. Andreas Dotzauer (examiner), Dr. Bernhard Fuchs (reviewer), Dr. Greta Reintjes (committee member), Dr. Mario Waespy (committee member), Sofia Pahl (stundent committee member))

Jaagni Parnami

Department: MARUM MPG Bridge Group Mar­ine Gly­cobi­o­logy

Exam Date: Wednesday, July 8, 2026

Topic of the dissertation:

"Purification and desalting of marine algal polysaccharides followed by detection with novel gut bacterial enzymes"

Carlotta Kück

Defense Carlotta Kück
Congratulations Carlotta! (from left to right: Dr. Florence Schubotz, Prof. Dr. Marcel Kuypers, Carlotta Kück, Dr. Wiebke Mohr, Giovanni Guerzoni, Prof. Dr. Wolfgang Bach) © MPIMM

Carlotta Kück

Department: Biogeochemistry

Exam Date: Friday, June 26, 2026

Topic of the dissertation:

"Ecoevolutionary adaptations to oligotrophy by chemosynthetic symbionts"

Isabella Wilkie

Defense Isa Wilkie
Congratulations, Isa! (from left to right: Tomás Sauma Sánchez, Michael Secreto, Prof. Dr. Tilmann Harder, Dr. Luis Orellana, Isa Wilkie, Prof. Dr. Rudolf Amann Prof. Dr. Carol Arnosti) © MPIMM

Isabella Wilkie

Abteilung: ERC Research Group for Ecological Genomics

Prüfungstermin: Friday, May 8, 2026

Titel der Dissertation:

"Bioinformatic analyses of species and intra-population diversity within Verrucomicrobiota populations"

Judith van der Giessen

Defense Judith van der Giessen
Judith wears her Stroopwafel hat! (from left to right: Dr. Jana Milucka, Judith van der Giessen, Dr. Hannah Marchant, Dr. Ewa Burwicz-Galerne, Prof. Dr. Hans-Peter Grossart, Prof. Dr. Marcel Kuypers, Laura Przybylek) © MPIMM

Judith van der Giessen

Department: Biogeochemistry

Exam Date: Thursday, April 30, 2026

Topic of the dissertation:

"Aerobic methane production is dominated by microbial methylphosphonate utilization in phosphate-limited marine surface waters"

Jördis Stührenberg

Defense Jördis Stührenberg
Congratulations: Jördis hot her hat! (from left to right: Paul Mock, Dr. Hannah Marchant, Dr. Florence Schubotz, Prof. Dr. Marcel Kuypers, Jördis Stührenberg, Prof. Dr. Laura Lehtovirta-Morley, Dr. Solveig Büring, Prof. Dr. Gesine Mollenhauer) © MPIMM

Jördis Stührenberg

Department: Biogeochemistry

Exam Date: Thursday, April 23, 2026

Topic of the dissertation:

"Beyond ammonium: dissolved organic nitrogen utilization by marine nitrifiers"

Jeronimo Cifuentes

Defense Jeronimo Cifuentes
Congratulations: Jero got his hat! (from left to right: Sophia Fatima, Wilson Castillo, Luis Orellana, Jeronimo Cifuentes, Prof. Dr. Nicole Dubilier, Prof. A. Murat Eren, Prof. Dr. Tilmann Harder) © MPIMM

Jeronimo Cifuentes

Department: Symbiosis

Exam Date: Thursday, March 12, 2026

Topic of the dissertation:

"Within-species diversity of sulfur-oxidizing symbionts from deep-sea bathymodioline mussels"

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