搜索结果: 1-15 共查到“海洋地球物理学 nitrogen”相关记录22条 . 查询时间(0.164 秒)
Nitrogen fixation and dissimilatory nitrate reduction to ammonium (DNRA) support nitrogen dynamics in Texas estuaries
Nitrogen fi xation dissimilatory nitrate
2014/4/30
We conducted continuous-flow experiments on intact sediment cores from Laguna Madre, Sabine Lake, East
Matagorda Bay, and Nueces Estuary to evaluate internal nitrogen (N) sources, sinks, and re...
Nitrogen isotopic fractionation associated with growth on dinitrogen gas and nitrate by cyanobacteria
Nitrogen isotopic fractionation associated cyanobacteria
2014/4/18
This study investigated the bulk nitrogen isotopic composition and fractionation of marine and freshwater
cyanobacteria growing at the expense of atmospheric dinitrogen gas (N2) or nitrate (NO{
3
)...
Organic matter diagenesis and bacterial contributions to detrital carbon and nitrogen in the Amazon River system
Organic matter diagenesis bacterial contributions
2014/4/18
Amino sugars and amino acids, including the bacterial biomarkers muramic acid and D-amino acids, were
measured to investigate the diagenetic alterations of and microbial contributions to detrital org...
Benthic biogeochemical cycling, nutrient stoichiometry, and carbon and nitrogen mass balances in a eutrophic freshwater bay
Benthic biogeochemical cycling nutrient stoichiometry
2014/4/18
Green Bay, while representing only ,7% of the surface area and ,1.4% of the volume of Lake Michigan,
contains one-third of the watershed of the lake, and receives approximately one-third of the total...
Increased supply of ambient nitrogen has minimal effect on salt marsh bacterial production
Increased supply of ambient nitrogen salt marsh
2014/4/18
We examined the role of chronic low-level nutrient enrichment on the productivity of heterotrophic marsh
bacteria via a marsh fertilization experiment in which we mimicked the conditions of widesprea...
Quantification of zooplankton trophic position in the North Pacific Subtropical Gyre using stable nitrogen isotopes
zooplankton trophic position North Pacific Subtropical Gyre
2014/4/17
We quantify the trophic positions of subtropical open-ocean zooplankton species using amino acid–specific
(AA) stable nitrogen isotopic compositions. We model animal trophic position by computing tro...
Nitrogen-fixation strategies and Fe requirements in cyanobacteria
Nitrogen-fixation strategies Fe requirements
2014/4/22
Diazotrophic (nitrogen-fixing) cyanobacteria are important contributors of new nitrogen to oligotrophic
environments and greatly influence oceanic productivity. We investigated how iron availability ...
Competition and facilitation between unicellular nitrogen-fixing cyanobacteria and non–nitrogen-fixing phytoplankton species
Competition facilitation unicellular nitrogen-fixing
2014/4/22
Recent discoveries show that small unicellular nitrogen-fixing cyanobacteria are more widespread than
previously thought and can make major contributions to the nitrogen budget of the oceans. We comb...
Nitrogen incorporation and retention by bacteria, algae, and fauna in a subtropical intertidal sediment: An in situ 15N-labeling study
Nitrogen incorporation retention by bacteria
2014/4/22
We performed a 15N-labeling study to investigate nitrogen incorporation and retention by the benthic
microbial community (bacteria and benthic microalgae) and fauna in the intertidal sediment of the ...
Nitrogen as the limiting nutrient for eutrophication in coastal marine ecosystems: Evolving views over three decades
Nitrogen marine ecosystems
2014/4/30
The first special volume of Limnology and Oceanography, published in 1972, focused on whether phosphorus
(P) or carbon (C) is the major agent causing eutrophication in aquatic ecosystems. Only ...
A new numerical technique for tracking chemical species in a multisource, coastal ecosystem applied to nitrogen causing Ulva blooms in the Bay of Brest (France)
tracking chemical species multisource
2014/4/30
A new numerical technique is presented that allows the tracking of any chemical element from any source in a
simulated foodweb, for instance assessing the proportion of these sources (river loadings,...
Nitrogen processing in a tidal freshwater marsh: A whole-ecosystem 15 N labeling study
Nitrogen processing tidal freshwater marsh
2014/5/13
We quantified the fate and transport of watershed-derived ammonium in a tidal freshwater marsh fringing the nutrientrich Scheldt River in a whole-ecosystem 15
N labeling experiment.
15
N-NH w...
Expression of the nitrogen stress response gene ntcA reveals nitrogen-sufficient Synechococcus populations in the oligotrophic northern Red Sea
nitrogen stress response gene nitrogen-suffi cient Synechococcus
2014/5/13
Determining the nitrogen (N) status of phytoplankton is important for understanding primary production and N
cycling in marine ecosystems. We assayed transcript levels of the N regulatory gene ntcA t...
The stoichiometry of dissolved organic carbon, nitrogen, and phosphorus release by a planktonic grazer, Daphnia
dissolved organic carbon nitrogen phosphorus release
2014/5/19
We examined the relationship between Daphnia release rates and ratios of dissolved organic carbon (DOC),
nitrogen (N), and phosphorus (P) and the elemental composition of algal food. We constructed a...
Novel copper-binding and nitrogen-rich thiols produced and exuded by Emiliania huxleyi
Novel copper-binding nitrogen-rich thiols produced
2014/5/19
In surface seawater, dissolved copper (Cu) is predominantly bound by a small pool of strong ligands, with further
complexation by a larger pool of weaker ligands. Although the chemical structure of b...