Corrigendum to 'Modeling mixoplankton along the biogeochemical gradient of the Southern North Sea' Ecological Modelling 458 (2021) 0304-3800/109690.

[This corrects the article DOI: 10.1016/j.ecolmodel.

Modeling mixoplankton along the biogeochemical gradient of the Southern North Sea.

The ecological importance of mixoplankton within marine protist communities is slowly being recognized. However, most aquatic ecosystem models do not include formulations to model a complete protist community consisting of phytoplankton, protozooplankton and mixoplankton. We introduce PROTIST, a new module for the aquatic ecosystem modelling software Delft3D-WAQ that can model a protist community consisting of two types of phytoplankton (diatoms and green algae), two types of mixoplankton (constitutive mixoplankton and non-constitutive mixoplankton) and protozooplankton.

A dataset on trophic modes of aquatic protists.

Background: An important functional trait of organisms is their trophic mode. It determines their position within food webs, as well as their function within an ecosystem. For the better part of the 20 century, aquatic protist communities were thought to consist mainly of producers (phytoplankton) and consumers (protozooplankton).

Role of Calcium in Secondary Structure Stabilization during Maturation of Nitrous Oxide Reductase.

The copper enzyme nitrous oxide reductase catalyzes the two-electron reduction of nitrous oxide N₂O to dinitrogen N₂. Its maturation largely occurs in the periplasm and includes the insertion of at least one Ca²⁺ ion per monomer. Here we have investigated the role of this structural cation in recombinantly produced apo-N₂OR from Shewanella denitrificans and have determined the three-dimensional structure of the protein by X-ray crystallography.

No laughing matter: the unmaking of the greenhouse gas dinitrogen monoxide by nitrous oxide reductase.

The gas nitrous oxide (N₂O) is generated in a variety of abiotic, biotic, and anthropogenic processes and it has recently been under scrutiny for its role as a greenhouse gas. A single enzyme, nitrous oxide reductase, is known to reduce N₂O to uncritical N₂, in a two-electron reduction process that is catalyzed at two unusual metal centers containing copper. Nitrous oxide reductase is a bacterial metalloprotein from the metabolic pathway of denitrification, and it forms a 130 kDa homodimer in which the two metal sites CuA and CuZ from opposing monomers are brought into close contact to form the active site of the enzyme.