Denitrification and ammonia formation in anaerobic coastal sediments.
Isao Koike,Akihiko Hattori +1 more
TLDR
The reduction rate data suggest that the pathway of nitrate reduction to ammonia is important in coastal sediments.Abstract:
Simultaneous determinations of nitrogen gas production, ammonia, and particulate organic nitrogen formation in the coastal sediments of Mangoku-Ura, Simoda Bay, and Tokyo Bay were made by using the 15N-label tracer method. The rate of nitrogen gas production in the sediment surface layer was about 10−2 μg atom of N per g per h, irrespective of the location of the sediments examined. [15N]ammonia and -particulate organic nitrogen accounted for 20 to 70% of the three products, and after several hours of incubation, the major fraction of nondenitrified 15N in Mangoku-Ura and Simoda Bay sediments was recovered as ammonia. In Tokyo Bay sediments, particulate organic nitrogen was produced at a greater rate than was ammonia. The reduction rate data suggest that the pathway of nitrate reduction to ammonia is important in coastal sediments.read more
Citations
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Journal ArticleDOI
Denitrification: ecological niches, competition and survival
TL;DR: It is suggested that organic carbon is more important than oxygen status in determining denitrifying enzyme content of habitats, and Michaelis-Menten theoretical models suggest the conditions required to achieve changes in partitioning between the two fates of nitrate.
Book ChapterDOI
Anaerobic Metabolism: Linkages to Trace Gases and Aerobic Processes
TL;DR: A review of anaerobic metabolism emphasizes aerobic oxidation, because the two processes cannot be separated in a complete treatment of the topic as mentioned in this paper, which is process oriented and highlights the fascinating microorganisms that mediate biogeochemistry.
Flux and Sources of Nutrients in the Mississippi-Atchafalaya River Basin
Donald A. Goolsby,William A. Battaglin,Gregory B. Lawrence,Richard S. Artz,Brent T. Aulenbach,Richard P. Hooper,Dennis R. Keeney,Gary J. Stensland +7 more
TL;DR: In this article, the authors address the following two questions: 1) What are the loads (flux) of nutrients transported from the Mississippi-Atchafalaya River Basin to the Gulf of Mexico, and where do they come from within the basin? 2) What is the relative importance of specific human activities, such as agriculture, point-source discharges, and atmospheric deposition in contributing to these loads?
Journal ArticleDOI
Dissimilatory nitrate reduction to ammonium (DNRA) as a nitrogen link, versus denitrification as a sink in a shallow estuary (Laguna Madre/Baffin Bay, Texas)
Soonmo An,Wayne S. Gardner +1 more
TL;DR: In this article, a combination of membrane inlet mass spectrometry (MIMS) and high performance liquid chromatography (HPLC) allowed accurate and simple estima- tion of these 2 dissimilatory pathways of NO3 reduction.
References
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Journal ArticleDOI
Steam distillation methods for determination of ammonium, nitrate and nitrite
J. M. Bremner,D. R. Keeney +1 more
TL;DR: In this article, steam distillation methods of determining ammonium, nitrate, and nitrite in the presence of alkali-labile organic nitrogen compounds are described, which are used for tracer studies using 15N-enriched compounds.
Journal ArticleDOI
Reduction of nitrogenous oxides by microorganisms.
TL;DR: This paper presents a meta-analysis of the phytochemical properties of nitrate reductase, and some of the mechanisms behind its development and application in bacteria and algae.
Journal ArticleDOI
The Nitrogen Cycle in Sediment-Water Systems
TL;DR: A review of the literature on the fate of nitrogen in waters and sediments is presented in this paper, focusing on the importance of N to aquatic productivity, the pathways leading to N gains or losses in aquatic ecosystems, and the availability of N in sediments to the overlying waters.