M. M. Gehringer

Exploring the influence of atmospheric CO2 and O2 levels on the utility of nitrogen isotopes as proxy for biological N2 fixation

This paper investigates how atmospheric CO2 and O2 levels affect nitrogen isotope signatures in nitrogen fixation by cyanobacteria, finding stable signals with correlations to CO2, light, and toxin production.

Early-branching cyanobacteria up-regulate superoxide dismutase activity under a simulated early Earth anoxic atmosphere.

Lack of Fe(II) transporters in basal Cyanobacteria complicates iron uptake in ferruginous Archean oceans.

This study shows basal Cyanobacteria lacked Fe(II) transporters, suggesting they scavenged Fe(III) instead of absorbing Fe(II) before the Great Oxygenation Event.

A low-cost automized anaerobic chamber for long-term growth experiments and sample handling

This paper describes a low-cost, Arduino-based anaerobic workstation for microbial cultivation and sample handling, capable of maintaining anaerobic conditions for extended periods.