搜索结果: 31-45 共查到“海洋科学 Nitrogen”相关记录168条 . 查询时间(0.046 秒)
Hydrologic control of nitrogen removal, storage, and export in a mountainstream
Hydrologic control nitrogen removal storage mountains tream
2014/4/17
Nutrient cycling and export in streams and rivers should vary with flow regime, yet most studies of stream nutrient transformation do not include hydrologic variability. We used astable isotope tracer...
Nitrogen fixation may not balance the nitrogen pool in lakes over timescales relevant to eutrophication management
Nitrogen fixation may not balance nitrogen pool in lakes over timescales relevant eutrophication management
2014/4/17
We explored multiyear linear trends in nutrient concentrations, nitrogen (N) : phosphorus (P) ratio, and phytoplankton biomass within the 37-yr, whole-ecosystem nutrient enrichment experiment in Lake ...
Temporal and spatial variability in the cycling of nitrogen within a constructed wetland: A whole-system stable-isotope-addition experiment
Temporal spatial variability in the cycling of nitrogen a constructed wetland A whole-system stable-isotope-addition experiment
2014/4/17
Constructed wetlands attenuate effluent nutrients, are hydrodynamically well defined, and are a useful proxy for the study of nitrogen (N) transformation in eutrophic natural systems. A whole-system s...
A discrepancy between predictions of saturating nutrient uptake models and nitrogen-to-phosphorus stoichiometry in the surface ocean
saturating nutrient uptake models nitrogen-to-phosphorus stoichiometry the surface ocean
2014/4/17
We derive a simple prediction about euphotic zone N : P stoichiometry from a large class of models that use saturating nutrient uptake functions to characterize N and P acquisition by phytoplankton. T...
Photoprotection mechanisms against ultraviolet radiation in Heterocapsa sp. (Dinophyceae) are influenced by nitrogen availability: Mycosporine-like amino acids vs. xanthophyll cycle
Heterocapsa sp Photoprotection mechanisms
2014/4/16
The photoprotective and acclimation capacity against ultraviolet radiation (UVR) was assessed for the
dinoflagellate Heterocapsa sp. We examined the effect of UVR and N availability on photosynthetic...
Physiological basis for high resistance to photoinhibition under nitrogen depletion in Emiliania huxleyi
Physiological basis high resistance photoinhibition under nitrogen depletion Emiliania huxleyi
2014/4/16
We quantified and compared the photophysiological characteristics ofEmiliania huxleyiwith two marine diatoms Thalassiosira pseudonanaandCoscinodiscussp. under nitrogen- and phosphorus-replete and -dep...
Molybdenum–nitrogen co-limitation in freshwater and coastal heterocystouscyanobacteria
coastal heterocystous cyanobacteria
2014/4/16
Molybdenum (Mo) is essential for the biological assimilation of inorganic nitrogen (N). We compared Mo
requirements for N2
-fixation in two species of filamentous heterocystous cyanobacteria (HC) to...
Direct determination of nitrogen cycling rates and pathways in Arctic fjord sediments (Svalbard, Norway)
pathways nitrogen cycling rates
2014/4/16
Results from a study of benthic nitrogen cycling in two Arctic fjords are presented. Intact sediment core
incubations were used to quantify net fluxes of dissolved inorganic nitrogen, organic nitroge...
Nitrogen source preference ofAspergillus sydowii, an infective agent associated with aspergillosis of sea fan corals
Nitrogen source preference Aspergillus sydowii an infective agent associated aspergillosis sea fan corals
2014/4/16
We attempt to identify the mechanism by which nitrogen enrichment increases the prevalence of aspergillosis, a disease caused by the terrestrial fungus Aspergillus sydowii, which infects sea fan coral...
Regulation of the nitrogen biogeochemistry of mountain lakes by subsidies of terrestrial dissolved organic matter and the implications for climate studies
the nitrogen biogeochemistry mountain lakes subsidies terrestrial dissolved organic matter the implications for climate
2014/4/16
table isotopes of nitrogen (N) were analyzed in modern sediments of mountain lakes, dissolved organic matter(DOM), and sediment cores spanning the past 12,000 yr to test the hypothesis that spatial an...
Nitrogen and phosphorus inputs control phytoplankton growth in eutrophic Lake Taihu, China
Nitrogen phosphorus inputs control phytoplankton growth eutrophic Lake Taihu
2014/4/16
Lake Taihu (Taihu) is the third largest freshwater lake in China and an important drinking water, fishing, and tourism resource for Jiangsu Province. Recent toxic cyanobacterial blooms caused by exces...
Benthic biogeochemical cycling, nutrient stoichiometry, and carbon and nitrogen mass balances in a eutrophic freshwater bay
Benthic biogeochemical cycling nutrient stoichiometry carbon and nitrogen mass balances eutrophic freshwater bay
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 ...
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...