Cell density dependent restriction of N2O reductase in denitrifying Pseudomonas spp., a potential driver of N2O emissions in natural systems.

Denitrification is a major biological source and sink for the ozone-depleting greenhouse gas N2. Thus, the respiratory physiology of denitrifiers and the mechanisms determining their propensity for accumulation of N-oxides are of fundamental interest. Here, we report a pervasive positive correlation between cell density and N2O accumulation in Pseudomonas aeruginosa and P.

Insertion of an endogenous Jaagsiekte sheep retrovirus element into the BCO2 - gene abolishes its function and leads to yellow discoloration of adipose tissue in Norwegian Spælsau (Ovis aries).

Background: The accumulation of carotenoids in adipose tissue leading to yellow fat is, in sheep, a heritable recessive trait that can be attributed to a nonsense mutation in the beta-carotene oxygenase 2 (BCO2) gene. However, not all sheep breeds suffering from yellow fat have this nonsense mutation, meaning that other functional mechanisms must exist. We investigated one such breed, the Norwegian spælsau.