Results 91 to 100 of about 4,448 (271)

SULFUR ISOTOPES GEOCHEMISTRY OF THE BITUMINOUS FATHA EVAPORATES IN FATHA FORMATION, HIT–ABU JIR AREA, WESTERN IRAQ

Iraqi Geological Journal, 2016
Fatha Formation (Middle Miocene) in Hit area, western Iraq was targeted for this study. Pure gypsum, bituminous gypsum and native sulfur were investigated for δ34S, FTIR and SEM to define the historical scenario of the paleo-environment and the ...
Salih Muhammad Awadh, Zinah Saleem Al-Ankaz   +1 more
doaj   +1 more source

Radiocarbon and Stable Carbon Isotope Constraints on the Propagation of Vent CO2 to Fluid in the Acidic Kueishantao Shallow Water Hydrothermal System

Geochemistry, Geophysics, Geosystems, 2022
We report radiocarbon and stable carbon isotope measurements from vent gas (CO2(g)), dissolved inorganic carbon (DIC), and particulate organic carbon (POC), from two vents of the Kueishantao (KST) shallow‐water hydrothermal system, offshore northeast ...
Shing‐Lin Wang, Yu‐Shih Lin, George S. Burr, Pei‐Ling Wang, Li‐Hung Lin   +4 more
doaj   +1 more source

Liebig Review: Essential and Beneficial Elements in the Regulation of Cadmium Uptake and Tolerance in Crop Plants

Journal of Plant Nutrition and Soil Science, EarlyView.
ABSTRACT Cadmium (Cd2+) contamination in agricultural soils has been reported to pose risks to crop productivity, food safety, and human health. This review synthesizes current knowledge on the mechanisms by which essential (S, Zn, Fe, Mg, K, Ca) and beneficial (Si, Se, rare earth elements) elements mitigate Cd2+ toxicity in plants.
Maria Manzoor, Karl Hermann Mühling
wiley   +1 more source

Sulfur Cycling During Progressive Burial in Sulfate‐Rich Marine Carbonates

Geochemistry, Geophysics, Geosystems, 2020
The isotopic composition of sulfate in the rock record has been frequently used to track the changes in the Earth's surface environments. By considering isotopic fractionation imparted by microbial sulfate reduction (MSR) and thermochemical sulfate ...
Lei Jiang, Mojtaba Fakhraee, Chunfang Cai, Richard H. Worden   +3 more
doaj   +1 more source

Deglaciation of the Burren glacio‐karst, western Ireland, during Termination 1: Implications for North Atlantic climate and karstification

Journal of Quaternary Science, EarlyView.
Abstract The Burren uplands in western Ireland form one of the most extensive and best‐preserved examples of glacio‐karst in Europe. Subsumed by the Irish ice sheet during the Late Pleistocene, granite erratic boulders and in situ silica veins in the limestone bedrock provide a rare opportunity to reconstruct the timing and rate of deglaciation ...
Gordon Bromley, Colin Bunce, Brenda Hall, Aaron Putnam, Frank McDermott   +4 more
wiley   +1 more source

Effects of preservatives and poisons on the elemental and isotopic composition of freshwater particulate organic matter

Limnology and Oceanography: Methods, EarlyView.
Abstract Sediment traps, often used in tandem with preservatives or poisons, are widely used for the collection of particulate organic matter (POM), providing insight into the source to sink mechanisms that shape major biogeochemical cycles and sedimentary carbon sequestration.
Diana Velazquez, Nathan D. Sheldon, Jenan J. Kharbush   +2 more
wiley   +1 more source

Ginseng authenticity testing by measuring carbon, nitrogen, and sulfur stable isotope compositions that differ based on cultivation land and organic fertilizer type

Journal of Ginseng Research, 2017
Background: The natural ratios of carbon (C), nitrogen (N), and sulfur (S) stable isotopes can be varied in some specific living organisms owing to various isotopic fractionation processes in nature.
Ill-Min Chung, Taek-Jun Lee, Yong-Taek Oh, Bimal Kumar Ghimire, In-Bae Jang, Seung-Hyun Kim   +5 more
doaj   +1 more source

Chemical Ionization Mass Spectrometry: Fundamental Principles, Diverse Applications, and the Latest Technological Frontiers

Mass Spectrometry Reviews, EarlyView.
ABSTRACT The review examines the evolution of chemical ionization mass spectrometry (CI‐MS), a technique developed in 1966 by Field and Munson. CI is a soft‐ionization method that produces more intense molecular ions with less fragmentation than electron ionization (EI).
Malvika Dutt, Adriana Arigò, Giorgio Famiglini, Pierangela Palma, Achille Cappiello   +4 more
wiley   +1 more source

Mass-dependent sulfur isotope fractionation during reoxidative sulfur cycling:A case study from Mangrove Lake, Bermuda

, 2015
The multiple sulfur isotope composition of porewater sulfate from the anoxic marine sapropel of Mangrove Lake, Bermuda was measured in order to establish how multiple sulfur isotopes are fractionated during reoxidative sulfur cycling.The porewater ...
Wing, Boswell A., Rough, Mikaella, Pellerin, André, Bui, Thi Hao, Mucci, Alfonso, Canfield, Donald Eugene; id_orcid   +5 more
core   +1 more source

Metal-binding amino acid ligands commonly found in metalloproteins differentially fractionate copper isotopes

Scientific Reports
Copper (Cu) is a cofactor in numerous key proteins and, thus, an essential element for life. In biological systems, Cu isotope abundances shift with metabolic and homeostatic state. However, the mechanisms underpinning these isotopic shifts remain poorly
Corday R. Selden, Kathrin Schilling, Linda Godfrey, Nathan Yee   +3 more
doaj   +1 more source