Results 21 to 30 of about 35,305 (286)

Establishment of a Purge and Trap Continuous-Flow Isotope Ratio Mass Spectrometer System for Analysis of Stable Nitrate Isotopes (δ¹⁵N and δ¹⁸O) in Water Samples by Ti(III) Reduction. [PDF]

Rapid Commun Mass Spectrom
ABSTRACT Rationale Pollution of surface and shallow groundwater by nitrate (NO3−$$ {\mathrm{NO}}_3^{-} $$) is a global concern, resulting in the deterioration of drinking water quality. Stable isotopes of NO3−$$ {\mathrm{NO}}_3^{-} $$ (δ15N and δ18O) can be used to trace its sources and identify prevailing biogeochemical processes.
Gcakasi MN, Stumpp C, Watzinger A.
europepmc   +2 more sources

Characterization of the PM2.5 aerosol fraction monitored at a suburban site in south-eastern Italy by integrating isotopic techniques and ion beam analysis

Frontiers in Environmental Science, 2022
Both teflon and quartz PM2.5 filters collected from January to July 2021 at the monitoring site of the Department of Mathematics and Physics of the University of Salento in Lecce (Italy) were analyzed by integrating different characterization techniques (
Salvatore Romano, Susy Pichierri, Mattia Fragola, Alessandro Buccolieri, Gianluca Quarta, Lucio Calcagnile   +5 more
doaj   +1 more source

Development of an advanced on-line position-specific stable carbon isotope system and application to methyl tert-butyl ether [PDF]

, 2009
We present an advanced system for on-line position-specific carbon isotope analysis. The main limitation of on-line intramolecular isotope ratio measurements has been that optimal pyrolytic fragments are obtained mostly at temperatures where the analyte ...
Abelson, Barrie, Barth, Benson, Coplen, Corso, Corso, Corso, Daly, Dempster, Dias, Elsner, Elsner, Fischer, Gray, Hall, Hall, Harrington, Hayes, Hirschorn, Huang, Hunkeler, Jasper, Jeffrey, Kolhatkar, Kuder, Mancini, Mariotti, Matthews, Meckenstock, Meier-Augenstein, Meier-Augenstein, Merritt, Miller, Monson, Morrison, O'Sullivan, Poulson, Richnow, Rosell, Sacks, Sano, Schmidt, Schmidt, Schüth, Slater, Slater, Slater, Smallwood, Somsamak, Somsamak, Vogler, Wang, Wolyniak, Wolyniak, Yamada, Zwank   +56 more
core   +1 more source

Integrating heterogeneous distributed COTS discrete-event simulation packages: An emerging standards-based approach [PDF]

, 2006
This paper reports on the progress made toward the emergence of standards to support the integration of heterogeneous discrete-event simulations (DESs) created in specialist support tools called commercial-off-the-shelf (COTS) discrete-event simulation ...
Low, M Y H, Taylor, S J E, Turner, S J, Wang, X   +3 more
core   +2 more sources

Highlighting the effects of co‐eluting interferences on compound specific stable isotope analysis of polycyclic aromatic hydrocarbons using comprehensive two‐dimensional gas chromatography [PDF]

, 2014
Accuracy is the most important issue when carrying out compound specific stable isotope analysis of polycyclic aromatic hydrocarbons extracted from complex samples.
Blessing, Buczyńska, Elsner, Gauchotte-Lindsay, Graham, Liu, Mansuy, Mazeas, McGregor, McGregor, McRae, Meier-Augenstein, Pashin, Philp, Philp, Saber, Steinbach   +16 more
core   +1 more source

Grapes from the geographical areas of the Black Sea: Agroclimatic growing conditions and evaluation of stable isotopes compositions in scientific study

BIO Web of Conferences, 2016
The report considers the agroclimatic conditions in the Black Sea districts of cultivation and processing of grapes - the Black Sea Lowland, the Crimean Peninsula and the South-west coastal areas of the Greater Caucasus.
Kolesnov Alexander, Agafonova Natalya
doaj   +1 more source

Modification of Elemental Analysis-Stable Isotope Ratio Mass Spectrometer Combined Instrument for Determination of Sulfur Isotopes in Solid Samples

Journal of Isotopes, 2021
In this paper, the elemental analysis-stable isotope ratio mass spectrometer (EA-IRMS) is modified to testing different forms of sulfur isotope standard material and sample.
YIN Xijie;WANG Yongtao;LIU Weiwei;SU Jing
doaj   +1 more source

Oxygen isotope compositions of conodonts – analytical challenges of in situ SIMS studies [PDF]

Estonian Journal of Earth Sciences, 2023
Reliable deep-time environmental and climate reconstructions are needed to understand the drivers of Earth’s system evolution over geological time. Palaeozoic temperature estimates, including reconstructions of the climate change through the Ordovician,
Alicja Wudarska, Michael Wiedenbeck, Olle Hints, Peep Männik, Aivo Lepland, Michael M. Joachimski, Frédéric Couffignal, Maria Rosa Scicchitano, Franziska D. H. Wilke   +8 more
doaj   +1 more source

A multi-methodological protocol to characterize PDO olive oils [PDF]

, 2018
An analytical approach including Panel Test, Isotope Ratio Mass Spectrometry (IRMS) and Nuclear Magnetic Resonance (NMR) spectroscopy was proposed to characterize Italian “Colline Pontine” PDO olive oils (40 samples) of two consecutive crop years.
Camin, Federica, Capitani, Donatella, Centauri, Luigi, Circi, Simone, Di Vecchia, Andrea, D’Achille, Giovanni, Ingallina, Cinzia, Leonardi, Genesio, Mannina, Luisa, Vista, Silvia   +9 more
core   +1 more source

Contrasting Roles of Islet Resident Immunoregulatory Macrophages and Dendritic Cells in Experimental Autoimmune Type 1 Diabetes.

PLoS ONE, 2016
The innate immune system critically shapes diabetogenic adaptive immunity during type 1 diabetes (T1D) pathogenesis. While the role of tissue-infiltrating monocyte-derived macrophages in T1D is well established, the role of their tissue-resident ...
Thomas B Thornley, Krishna A Agarwal, Periklis Kyriazis, Lingzhi Ma, Vaja Chipashvili, Jonathan E Aker, Sarantis Korniotis, Eva Csizmadia, Terry B Strom, Maria Koulmanda   +9 more
doaj   +1 more source