Job Description

MARUM – Zentrum für Marine Umweltwissenschaften

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Entgelt- / Besoldungsgruppe E 13 -

Teilzeit 65%

Kennziffer:

A200-25

Bewerbungsfrist:

15.08.2025


Öffentliche Ausschreibung





The University of Bremen, MARUM - Center for Marine Environmental Sciences - is offering a fixed-term position for a

Doctoral Researcher (f/m/d)

Salary Scale 13 TV-L

from 1 October 2025 at the earliest for a period of 45 months, until 30 June 2029 at the latest (according to § 2 WissZeitVG) within the Collaborative Research Centre “CONCENTRATE”.




The position is to be filled with 65% of the regular weekly working hours (25.48 hours/week).

Stellenbeschreibung

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We are looking for highly motivated candidates to join the newly established Collaborative Research Centre “Carbon Sequestration at Å resolution (CONCENTRATE)”, funded by the German Research Foundation (DFG). This CRC combines the expertise of the University of Greifswald, the University of Bremen, the Max-Planck-Institute for Marine Microbiology Bremen, the Max-Planck-Institute of Colloids and Interfaces Potsdam, the Leibniz Institute for Baltic Sea Research and the Technical University of Berlin.


The aim of CONCENTRATE is to decipher the molecular and microbial processes that lead to the stabilization of glycans in the ocean. In an interdisciplinary approach, the research team combines laboratory experiments with measurements in natural marine habitats. The focus is on the interactions between algae, bacteria, fungi, their glycans and proteins - down to atomic resolution. The elucidation of these microbial and biochemical mechanisms will contribute to a better understanding of carbon fluxes in the oceans.


Within the CRC CONCENTRATE you will work on subproject B05 under the direction of Prof. Jan-Hendrik Hehemann, Carbon Sequestration and Glycobiochemistry. By investigating how algal glycans act as adhesives that bind cells, molecules, and minerals, this project will investigate why some glycans contribute to carbon sequestration in the oceans. The central working hypothesis is that certain algal glycans aggregate bacterial proteins and other molecules. These aggregates are dense, sink and become marine sediments that store carbon for millennia and longer.


You will conduct biochemical reactions between algal glycans and bacterial proteins to assess the coagulation potential of the glycans. You will further investigate the effects of algal glycans on marine bacterial activity and organic matter degradation. Your project is linked to other microbiological and biochemical subprojects of the CRC and you will be part of an interdisciplinary network. You will have the opportunity to work on your PhD in a small research group and will be supported by the University's PhD programs. You will also be able to collaborate with national and international research partners.

Your responsibilities:

Laboratory experiments to quantitatively describe the interactions of algal glycans and proteins In situ glycan addition experiments with naturally occurring microbes and proteins in seawater Microbiological and enzymatic degradation studies of model marine snow aggregates Qualitative and quantitative analysis of glycans, proteins and the microbial community using chromatography, proteomics, 16SRNA and metagenomics sequencing Acquisition, analysis and presentation of scientific data Publication of the results in international journals The position offers the opportunity for academic qualification

Voraussetzungen

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Completed scientific university degree (Master's/University Diploma) in chemistry, biochemistry, biotechnology, microbiology or a related field. Applicants who are in the final phase of their Master's degree will also be considered. Please note that submission of the Master's degree certificate is mandatory for employment Experience with microbiology, Enzymology and/or proteomics Solid knowledge of instrumental analytical chemistry (chromatography, mass spectrometry) Very good written and spoken English

Desirable:

Great basic research interest in marine glycobiochemistry High motivation and ability to work actively in an interdisciplinary research and education environment Independent working style with team spirit, helpfulness and reliability

Allgemeine Hinweise

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We offer

Annual special payment ("Christmas bonus"), regular collectively agreed salary increases and additional public service pension scheme (VBL) A crisis-proof, interesting and varied job in a cosmopolitan university 30 days holiday per calendar year A diverse, future-orientated and open corporate culture Support from a collegial, motivated team with a positive working atmosphere Individual induction training The opportunity for further education and training Compatibility of family and career through flexible working hours (flexitime) and the option of mobile working (subject to the general conditions) Free social and family counselling services Active company health management, including the option of discounts at local sports clubs, gyms and swimming pools (EGYM WELLPASS) The option of using a job ticket for public transportation Numerous sports and cultural activities Varied catering options in the student union canteens
Open to unconventional approaches in research and teaching, the University of Bremen has retained its character as a place of short distances for people and ideas since its founding in 1971. With a broad spectrum of subjects, we combine exceptional performance and innovative potential. As an ambitious research university, we stand for research-based learning approaches and a pronounced interdisciplinary orientation. We actively pursue scientific cooperation in a spirit of global partnership.


Today, around 23,000 people learn, teach, research, and work on our international campus. In research and teaching, administration and operations, we are strongly committed to the goals of sustainability, climate justice, and climate neutrality. Our Bremen spirit is expressed in the courage to try new things, in supportive cooperation, in respect and appreciation for each other. With our study and research profile and as part of the European YUFE network, we assume social responsibility in the region, in Europe, and in the world.


The university is family-friendly, diverse and sees itself as an international university. We therefore welcome all applicants regardless of gender, nationality, ethnic and social origin, religion/belief, disability, age, sexual orientation and identity.


As the University of Bremen intends to increase the proportion of female employees in science, women are particularly encouraged to apply. In the case of equal qualifications, women are given priority, unless reasons relating to the person of a competitor prevail.


Disabled applicants will be given priority if their professional and personal qualifications are essentially the same.

MARUM - Zentrum für Marine Umweltwissenschaften

AG Kohlenstoffspeicherung und Glykobiochemie

Prof. Dr. Jan-Hendrik Hehemann

Universität Bremen, BIOM

James-Watt-Str. 1

28359 Bremen

Please note that no photos are to be attached to the application documents.

We kindly ask you to send us only copies (no portfolios) of your application documents, as we cannot return them. They will be destroyed after the selection process has been completed.

Any application costs cannot be reimbursed.