Biogeosciences
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Articles | Volume 23, issue 4
Articles | Volume 23, issue 4
https://doi.org/10.5194/bg-23-1591-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/bg-23-1591-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 23, issue 4
Research article
 | 
27 Feb 2026
Research article |  | 27 Feb 2026

A simplified approach for measuring Rubisco carbon isotope fractionation and the first determination in marine haptophyte Gephyrocapsa oceanica

Reto S. Wijker, Pere Aguiló-Nicolau, Madalina Jaggi, Jeroni Galmés, and Heather M. Stoll

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Short summary
Photosynthetic organisms leave characteristic carbon isotope fingerprints that help scientists study Earth’s carbon cycle. We developed a simpler laboratory method to measure these isotope effects in Rubisco, the key enzyme fixing CO2. Applying this approach, we obtained the first measurement for Gephyrocapsa oceanica, a widespread marine alga that plays a major role in ocean carbon cycling.
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