Results 261 to 270 of about 96,190 (296)

The nitrogen isotopic composition of biotic components in Northern Biscayne Bay and Associated Waterways, South Florida USA: implications for sources of nitrogen. [PDF]

Environ Sci Pollut Res Int
Swart PK, Saied A, Ahearn SP, Troxler T, Gidley M, Sinigalliano C, Karim A, Kelly E, Silverstein R.   +8 more
europepmc   +1 more source

Some of the next articles are maybe not open access.

Related searches:

Mercury and Stable Isotopes of Carbon and Nitrogen in Mink

Environmental Toxicology and Chemistry, 2007
Abstract Total Hg concentrations and values of stable isotopes (δ15N, δ13C) in tissues of mink (Mustela vison) captured in Rhode Island (USA) during winters of 1999 to 2004 were statistically distinct based on location. Mink captured in salt marsh environments (salt marsh group mink [SMGM]) had significantly lower mean Hg concentrations ...
James L, Lake, Stephan A, Ryba, Jonathan, Serbst, Charles F, Brown, Lori, Gibson   +4 more
openaire   +2 more sources

Stable Carbon and Nitrogen Isotopic

Aquatic Geochemistry, 2004
The perennially ice-covered lakes in the McMurdo Dry Valleys, Antarctica, are part of the coldest and driest ecosystem on earth. To understand lacustrine carbon and nitrogen cycling in this end-member ecosystem, and to define paleolimnological proxies for ice-covered lakes, we measured the stable carbon and nitrogen isotopic composition of particulate ...
Jennifer Lawson, Peter T Doran, Fabien Kenig, David J Des marais, John C Priscu   +4 more
openaire   +1 more source

Stable isotope studies of soil nitrogen

2020
Sound generalisations and predictions of soil processes are difficult to make with confidence because of the chemical, physical and biological variations that occur in soil at all scales in both space and time. Natural abundance studies have been used in a wide range of soil-nitrogen (N) investigations and have provided some insights to the complexity ...
D.W. Hopkins, R.E. Wheatley, D. Robinson
openaire   +1 more source

Stable Isotope Ratios of Marijuana. I. Carbon and Nitrogen Stable Isotopes Describe Growth Conditions*

Journal of Forensic Sciences, 2008
Abstract: There remains significant uncertainty in illicit marijuana cultivation. We analyzed the δ13C and δ15N of 508 domestic samples from known U.S.A. counties, 31 seized from a single location, 5 samples grown in Mexico and Colombia, and 10 northwest border seizures. For a subset, inflorescences and leaves were analyzed separately.
Jason B, West, Janet M, Hurley, James R, Ehleringer   +2 more
openaire   +2 more sources

Stable nitrogen isotope composition of NOx of biomass burning in China

Science of The Total Environment, 2022
Owing to the local characteristics of stable nitrogen isotopes in nitrogen oxides (δ15N-NOx) emitted from biomass burning, the lack of data on δ15N-NOx values associated with biomass burning in China limits the use of this parameter in identifying and quantifying the sources of atmospheric nitrate (NO3-) and NOx.
Yasheng, Shi, Ping, Tian, Zanfang, Jin, Yuming, Hu, Yongqi, Zhang, Feili, Li   +5 more
openaire   +2 more sources

Forest cover controls the nitrogen and carbon stable isotopes of rivers

Science of The Total Environment, 2022
Deforestation affects the ecological integrity of rivers and streams, threatening biodiversity and ecosystem services worldwide. However, few studies have strictly analyzed the effect of the functional responses of tropical streams to changes in forest cover since deforested basins are usually also influenced by confounding anthropogenic inputs.
Fausto, Machado-Silva, Vinicius, Neres-Lima, Andrea Franco, Oliveira, Timothy Peter, Moulton   +3 more
openaire   +2 more sources

STABLE NITROGEN AND SULFUR ISOTOPES IN ATMOSPHERIC CHEMISTRY

2021
SO2 and NOx (NO+NO2) are important trace gases in the atmosphere as they adversely affect air quality and are precursors to sulfate and nitrate aerosols in the atmosphere. However, there are significant uncertainties in the emission inventories and the atmospheric chemistry processes of both gases.
openaire   +1 more source

Stable Nitrogen Isotope Analysis by Optical Spectroscopy

Analytical Chemistry, 1958
Optical spectroscopy with photo-electric detection provides a rapid and precise micromethod for determining the nitrogen isotopic concentration of nitrogen gas and of nitric oxide gas. This paper describes the effect of operating conditions on the precision and the accuracy of such measurements.
H. P. Broida, M. W. Chapman
openaire   +1 more source

Variability in nitrogen stable isotope ratios of macroalgae: consequences for the identification of nitrogen sources

Journal of Phycology, 2014
In our research, we collected and analyzed numerous macroalgal specimens (738) for isotopic analysis sampled over a year at monthly intervals across 20 sites within the Urías lagoon complex, a typical subtropical coastal ecosystem located in the Gulf of California.
María Julia, Ochoa-Izaguirre, Martín F, Soto-Jiménez   +1 more
openaire   +2 more sources