Results 51 to 60 of about 128,824 (253)

Silicon isotopes as a tracer for silicate utilization in the Peruvian upwelling [PDF]

, 2011
EGU2011-6081 Natural stable isotopes are a powerful tool in marine sciences to investigate biological processes, such as present and past nutrient utilization.
Ehlert, Claudia, Frank, Martin, Grasse, Patricia, Ryabenko, Evgeniya   +3 more
core  

Tracking sources and fate of groundwater nitrate in Kisumu City and Kano Plains, Kenya [PDF]

, 2020
Groundwater nitrate (NO3−) pollution sources and in situ attenuation were investigated in Kisumu city and Kano plains. Samples from 62 groundwater wells consisting of shallow wells (hand dug, depth 15 m) were obtained during wet (May–July 2017) and dry ...
Boeckx, Pascal, Mureithi, Stephen, Nyilitya, Benjamin   +2 more
core   +1 more source

Application of Stable Isotopes in Identifying the Sources and Formation of Sulfate and Nitrate in PM_2.5: A Review

Atmosphere
Sulfate and nitrate are important components of atmospheric PM2.5, which is the main contributor of haze. Therefore, studying the sources and formation mechanisms of atmospheric sulfate and nitrate is very important for the prevention and control of haze
Jiamei Peng, Chen Cheng, Shanshan Wang, Gongren Hu, Jinpei Yan, Ruilian Yu   +5 more
doaj   +1 more source

The niche of shrimp stocks (Xiphopenaeus kroyeri Heller, 1862) from southeastern Brazil: a stable isotope approach

Journal of Threatened Taxa, 2020
The penaeid shrimp Xiphopenaeus kroyeri is the second most important species of crustacean in Brazilian fisheries. Stable isotopes of carbon and nitrogen are chemical proxies to provide quantitative information about the consumer isotopic niche, which is
Keltony de Aquino Ferreira, Leandro Rabello Monteiro, Ana Paula Madeira Di Beneditto   +2 more
doaj   +1 more source

Nitrogen isotope analysis of ammonium and glycine [PDF]

, 2005
Stable isotope techniques can be used as a tool in nitrogen cycling studies of different ecosystems. The studies are based on measurement of the heavy (15N)- to- light (14N) isotopic ratios of nitrogen in different biospheric pools.
Norlin, Elin
core  

The s process in massive stars at low metallicity. Effect of primary N14 from fast rotating stars

, 2008
The goal of this paper is to analyze the impact of a primary neutron source on the s-process nucleosynthesis in massive stars at halo metallicity. Recent stellar models including rotation at very low metallicity predict a strong production of primary N14.
Aoki, Aoki, F. Herwig, Farouqi, G. Meynet, Goswami, Hirschi, Langer, M. Pignatari, M. Wiescher, Mishenina, Montes, Pignatari, R. Gallino, R. Hirschi, Rauscher, Travaglio   +16 more
core   +1 more source

First ice core records of NO3− stable isotopes from Lomonosovfonna, Svalbard [PDF]

, 2014
Samples from two ice cores drilled at Lomonosovfonna, Svalbard, covering the period 1957–2009, and 1650–1995, respectively, were analyzed for NO3− concentrations, and NO3− stable isotopes (δ15N and δ18O).
Björkman, M. P., Isaksson, E., Kaiser, J., Marca, A., Martma, T., Pettersson, R., Pohjola, V. A., Samyn, D., Vega, C. P.   +8 more
core   +1 more source

On the relationship between collagen- and carbonate-derived carbon isotopes with implications for the inference of carnivore dietary behavior

Frontiers in Ecology and Evolution, 2022
Studies of Rancho La Brea predators have yielded disparate dietary interpretations when analyzing bone collagen vs. enamel carbonate—requiring a better understanding of the relationship between stable carbon isotopes in these tissues.
Larisa R. G. DeSantis, Larisa R. G. DeSantis, Larisa R. G. DeSantis, Robert S. Feranec, John Southon, Thure E. Cerling, John Harris, Wendy J. Binder, Wendy J. Binder, Joshua E. Cohen, Joshua E. Cohen, Joshua E. Cohen, Aisling B. Farrell, Emily L. Lindsey, Emily L. Lindsey, Emily L. Lindsey, Julie Meachen, Julie Meachen, Frank Robin O'Keefe, Frank Robin O'Keefe, Gary T. Takeuchi   +20 more
doaj   +1 more source

Gator: a low-background counting facility at the Gran Sasso Underground Laboratory [PDF]

, 2011
A low-background germanium spectrometer has been installed and is being operated in an ultra-low background shield (the Gator facility) at the Gran Sasso underground laboratory in Italy (LNGS).
, , , , , A Askin, A D Ferella, A Kish, A Manalaysay, E Aprile, E. Aprile, G. Heusser, G. Knoll, J Angle, J. Angle, L Baudis, L. Baudis, M Laubenstein, M Schumann, T Bruch, T Marrodán Undagoitia   +20 more
core   +1 more source

Nitrogen isotope ratio (δ15N): a nearly unexplored indicator that provides useful information in viticulture

OENO One
The study of the natural abundance of nitrogen-stable isotopes is an aspect of viticulture research that has received limited attention. While stable isotopes of carbon, oxygen and hydrogen have received significant attention, nitrogen isotope ratio ...
Luis Gonzaga Santesteban, Maite Loidi, Inés Urretavizcaya, Mónica Galar, Sara Crespo-Martínez, José Bernardo Royo, Carlos Miranda   +6 more
doaj   +1 more source