Jens K. Gundersen

TL;DR: It is suspected that the importance of O2 respiration in many coastal sediments has been overestimated, whereas metal oxide reduction (both Fe and Mn reduction) has probably been well underestimated.

TL;DR: In this paper, the authors reported that Thioploca cells are able to concentrate nitrate to up to 500 mM in a liquid vacuole that occupies > 80% of the cell volume.

TL;DR: In this paper, a microelectrode profiling instrument with a spatial resolution of 25-50 µm was used to analyze chemical microgradients within the diffusive boundary layer (DBL).

TL;DR: In this paper, the diffusion of O 2 fluxes through the diffusive boundary layer and the depth distribution of consumption rates within the sediment were calculated from the obtained microprofiles, and the difference correlated with the abundance of macrofauna in the sediment.

TL;DR: A planar optrode was used to measure the oxygen equilibration between small gas bubbles and surrounding water with a temporal resolution of 20 S. The sensor consists of an 02-quenchable fluorophore cast onto a 25 X 55 mm, 175 pm thick transparent PVC sheet, which can be introduced into sediments and microbial mats.