Nitrogen Metabolism in the Terrestrial Isopod,Oniscus asellus

Terrestrial atmospheric nitrogen in lunar soils?

Surface-correlated N in lunar soils and breccias exhibits an obvious but mysterious effect that was evident essentially from the first analyses of samples returned by the Apollo missions: The isotopic ratio N/N is variable, by up to 30%. For some time this was interpreted in terms of variation in the solar wind isotopic composition, perhaps reflecting solar nuclear processes and perhaps even re...

Breaks in the cycle: dissolved organic nitrogen in terrestrial ecosystems

Dissolved organic nitrogen (DON) is present in soils and streams around the world. We are only now beginning to explore the important roles this chemically heterogeneous mixture of compounds plays in terrestrial nitrogen (N) cycling. Over centuries, DON leaching may represent a significant "leak" of N, which occurs because plants and microbes cannot prevent DON losses, even in times of high N d...

Nitrogen metabolism in sheep.

I. 15NH4C1 was continuously infused for periods of 120-216 h into the rumens of sheep which were allowed to feed 2 out of every 10 min. These treatments achieved steady metabolic states and allowed the assessment of nitrogen conversions by means of tracer methodology. The sheep were given either a barley diet or one of three hay diets. In two trials, the flow of abomasal material was determined...

Nitrogen metabolism in haloarchaea

The nitrogen cycle (N-cycle), principally supported by prokaryotes, involves different redox reactions mainly focused on assimilatory purposes or respiratory processes for energy conservation. As the N-cycle has important environmental implications, this biogeochemical cycle has become a major research topic during the last few years. However, although N-cycle metabolic pathways have been studi...

Nitrogen Metabolism in Phytoplankton