Urbanization is escalating in many coastal areas of the US and is associated with deteriorating water quality. Often the associated changes in land use result in an overabundance of nutrients and other types of pollution entering ground and surface waters. It is important that we understand biogeochemical transformation processes on urbanizing watersheds if we are to develop management practice...

The present study aims in investigating simultaneous heterotrophic nitrification and aerobic denitrification (SND) ability of a newly isolated bacterium. The bacterial strain GS5 was isolated from a laboratory scale denitrifying bioreactor and characterized. Based on phenotypic and phylogenetic characteristics as derived from partial 16S rRNA gene sequence, the isolate was identified to be Baci...

Citation: Humphries AT, Ayvazian SG, Carey JC, Hancock BT, Grabbert S, Cobb D, Strobel CJ and Fulweiler RW (2016) Directly Measured Denitrification Reveals Oyster Aquaculture and Restored Oyster Reefs Remove Nitrogen at Comparable High Rates. Front. Mar. Sci. 3:74. doi: 10.3389/fmars.2016.00074 Directly Measured Denitrification Reveals Oyster Aquaculture and Restored Oyster Reefs Remove Nitroge...

Methylophaga sp. strains JAM1 and JAM7 have been isolated from a denitrification system. Strain JAM1 was the first Methylophaga strain reported to be able to grow under denitrifying conditions. Here, we report the complete genome sequences of the two strains, which allowed prediction of gene clusters involved in denitrification in strain JAM1.

Anaerobic growth of Pseudomonas aeruginosa PAO1 was affected by quorum sensing. Deletion of genes that produce N-acyl-l-homoserine lactone signals resulted in an increase in denitrification activity, which was repressed by exogenous signal molecules. The effect of the las quorum-sensing system was dependent on the rhl quorum-sensing system in regulating denitrification.

Biologically available nitrogen (N) limits phytoplankton growth over much of the ocean. The rate at which N is removed from the contemporary ocean by denitrifying bacteria is highly uncertain1–3. Some studies suggest that N losses exceed inputs2,4–6; others argue for a balanced budget3,7,8. Here, we use a global ocean circulation model to simulate the distribution of N2 gas produced by denitrif...

Nitrous oxide (N(2)O) emission from soils is a major contributor to the atmospheric loading of this potent greenhouse gas. It is thought that autotrophic ammonia oxidizing bacteria (AOB) are a significant source of soil-derived N(2)O and a denitrification pathway (i.e. reduction of NO(2) (-) to NO and N(2)O), so-called nitrifier denitrification, has been demonstrated as a N(2)O production mecha...

Understanding the mechanistic controls of microbial denitrification is of central importance to both environmental microbiology and ecosystem ecology. Loss of nitrate (NO3) is often attributed to carbon-driven (heterotrophic) denitrification. However, denitrification can also be coupled to sulfur (S) oxidation by chemolithoautotrophic bacteria. In the present study, we used an in situ stable is...

Hyphomicrobium spp. are commonly identified as major players in denitrification systems supplied with methanol as a carbon source. However, denitrifying Hyphomicrobium species are poorly characterized, and very few studies have provided information on the genetic and physiological aspects of denitrification in pure cultures of these bacteria. This is a comparative study of three denitrifying Hy...