Results 51 to 60 of about 3,667,411 (200)

Centrifugal Separation of Carbon Isotopes Using Heptafluoropropane as Processing Gas

Journal of Isotopes, 2020
The demand for stable isotopes has increased in the field of medical diagnosis, biopharming, quantum communication and so on. Natural carbon has two stable isotopes: 12C (98.89%) and 13C (1.11%). 13C in high abundance is mainly used in tracer field.
SUN Qiming;JIAN Conghui;ZHOU Mingsheng;PEI Gen
doaj   +1 more source

Links Between Carbon and Water Cycles in Northern Ecosystems: Constraints from Stable Isotopes [PDF]

, 2006
High-latitude climate change will have an impact on the carbon and water cycles in northern ecosystems. Stable isotopes in these systems can serve as indicators of changes and feedbacks.
Welp, Lisa Renee
core   +1 more source

Determining trophic niche width: a novel approach using stable isotope analysis [PDF]

, 2004
1. Although conceptually robust, it has proven difficult to find practical measures of niche width that are simple to obtain, yet provide an adequate descriptor of the ecological position of the population examined. 2.
Bearhop, S., Bearhop, Stuart, Fuller, R.A., Waldron, S., Adams, C.E., Macleod, H., Fuller, Richard A., Adams, Colin E., Waldron, Susan   +8 more
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Commentary: Reframing Massive Carbon Input During the PETM and a Grand 66 Million Year Geoscience Puzzle

Geophysical Research Letters
Despite decades of research, hundreds of peer‐reviewed papers, and considerable relevance to Earth's future, the rapid global warming and tremendous CO2 input at the start of the Paleocene‐Eocene Thermal Maximum (PETM) remain highly debated.
Gerald R. Dickens
doaj   +1 more source

Stable isotope analysis provides new information on winter habitat use of declining avian migrants that is relevant to their conservation [PDF]

, 2012
Winter habitat use and the magnitude of migratory connectivity are important parameters when assessing drivers of the marked declines in avian migrants. Such information is unavailable for most species.
Newton, J., Shai Markman, Markman Shai, Newton Jason, John W Mallord, Karl L Evans, Mallord, J.W., Markman, S., Evans Karl L., Evans, K.L., Mallord John W., Jason Newton   +11 more
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Cycad forensics: tracing the origin of poached cycads using stable isotapes, trace element concentrations and radiocarbon dating techniques [PDF]

, 2013
In South Africa, the greatest threat to cycad populations is the illegal removal of wild plants for landscaping purposes and collector's gardens, resulting in declining populations that are already threatened with extinction.
Retief, Kirsten
core   +1 more source

Stable Isotopes Reveal the Drivers of Post‐Wildfire Natural Regeneration of Interior Douglas‐Fir Seedlings in British Columbia

Ecology and Evolution
Wildfires are increasing in frequency and severity due to climate change, posing challenges to forest ecosystems, including the southern interior of British Columbia, Canada. Interior Douglas‐fir (Pseudotsuga menziesii var.
Julie McAulay, José Ignacio Querejeta, Gabriel Danyagri, Bianca N. I. Eskelson, Timothy J. Philpott, Sari C. Saunders, Eliot Mompeán, Ignacio Barbeito   +7 more
doaj   +1 more source

Nitrate perturbation drives carbon cycling in a tropical mangrove estuary

Journal of Hydrology: Regional Studies
Study region: Douala, Cameroon, West Africa Study focus: Tropical mangrove estuaries in sub-Saharan Africa receive far greater amounts of organic and inorganic carbon and pollutants compared to subtropical and temperate estuaries, yet they have not been ...
Claris N. Sunjo, Eliot A. Atekwana, Henry M.D. Agbogun, Isaac K. Njilah, Hendratta N. Ali   +4 more
doaj   +1 more source

Using isotopes of dissolved inorganic carbon species and water to separate sources of recharge in a cave spring, northwestern Arkansas, USA Blowing Spring Cave

Acta Carsologica, 2013
Blowing Spring Cave in northwestern Arkansas is representative of cave systems in the karst of the Ozark Plateaus, and stable isotopes of water (δ18O and δ2H) and inorganic carbon (δ13C) were used to quantify soil-water, bedrock-matrix water, and ...
Katherine J. Knierim, Erik Pollock, Phillip D. Hays   +2 more
doaj   +1 more source

Stable Isotope (δ13C, δ15N, δ18O, δD) Composition and Nutrient Concentration of Red Sea Primary Producers

Frontiers in Marine Science, 2018
Measurements of isotopic composition of marine primary producers are a valuable tool to follow and trace the source and cycling of organic matter in the marine systems, as well to describe the physiological status of aquatic photosynthetic organisms ...
Carlos M. Duarte, Antonio Delgado-Huertas, Andrea Anton, Paloma Carrillo-de-Albornoz, Daffne C. López-Sandoval, Susana Agustí, Hanan Almahasheer, Núria Marbá, Iris E. Hendriks, Dorte Krause-Jensen, Dorte Krause-Jensen, Neus Garcias-Bonet   +11 more
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