Results 31 to 40 of about 130,756 (301)

Factors influencing the stable carbon isotopic composition of suspended and sinking organic matter in the coastal Antarctic sea ice environment [PDF]

open access: yes, 2011
A high resolution time-series analysis of stable carbon isotopic signatures in particulate organic carbon (&delta;<sup>13</sup>C<sub>POC</sub>) and associated biogeochemical parameters in sea ice and surface waters provides an
Annett, A.L.   +9 more
core   +7 more sources

Stable Carbon Isotopes in Zea mays [PDF]

open access: yes, 2018
Summary The increasing demand for food production and predicted climate change scenarios highlight the need for improvements in crop sustainability. The efficient use of water will become increasingly important for rainfed agricultural crops even in fertile regions that have historically received ample precipitation ...
Twohey III, Robert J.   +2 more
openaire   +1 more source

Dry season limnological conditions and basin geology exhibit complex relationships with δ13C and δ15N of carbon sources in four Neotropical floodplains. [PDF]

open access: yesPLoS ONE, 2017
Studies in freshwater ecosystems are seeking to improve understanding of carbon flow in food webs and stable isotopes have been influential in this work.
Gustavo H Zaia Alves   +3 more
doaj   +1 more source

Heavy metals effects on life traits of juveniles of Procambarus clarkii [PDF]

open access: yes, 2019
An incubation experiment of juvenile crayfish (Procambarus clarkii) following a three- level treatment design approach was performed to assess the effect of different heavy metal concentrations on their life history traits (lifespan, growth, moult and ...
Alcorlo, Paloma   +2 more
core   +1 more source

Research on the Identification of Matheran Wine Region in the East Foot of Helan Mountain

open access: yesShipin gongye ke-ji
Objective: To explore the feasibility of using stable carbon and oxygen isotopes and mineral elements in small-scale regional wine production identification, the fractionation characteristics of stable isotopes of carbon and oxygen in wine of Matheran ...
Jianrong KAI   +7 more
doaj   +1 more source

Isotopes in hydrology and hydrogeology [PDF]

open access: yes, 2019
The structure, status, and processes of the groundwater system, which can only be acquired through scientific research efforts, are critical aspects of water resource management. Isotope hydrology and hydrogeology is a genuinely interdisciplinary science.
Barbieri, Maurizio
core   +1 more source

Applications of stable carbon isotopes in soil science with special attention to natural 13C abundance approach

open access: yesHungarian Geographical Bulletin, 2019
Since the invention of the isotope ratio mass spectrometer, isotope analysis has shed light on many key processes in the Earth’s ecosystems. Stable isotope analysis was first applied in the field of chemistry and geochemistry, while the use of isotopic ...
Dóra Zacháry
doaj   +1 more source

Tree growth acceleration and expansion of alpine forests: The synergistic effect of atmospheric and edaphic change. [PDF]

open access: yes, 2016
Many forest ecosystems have experienced recent declines in productivity; however, in some alpine regions, tree growth and forest expansion are increasing at marked rates.
Horwath, William R   +5 more
core   +2 more sources

Trophic ecology of the Endangered Darwin's frog inferred by stable isotopes [PDF]

open access: yes, 2018
Indexación: Scopus.Acknowledgements. We thank Dr. Mauricio González-Chang for his contribution to invertebrate identification and Sally Wren for the revision of an earlier version of the manuscript. We are also extremely grateful to Tomás Elgueta Alvarez
Alvarado-Rybak, M.   +4 more
core   +1 more source

Neutrino fluence after r-process freeze-out and abundances of Te isotopes in presolar diamonds [PDF]

open access: yes, 1998
Using the data of Richter et al. (1998) on Te isotopes in diamond grains from a meteorite, we derive bounds on the neutrino fluence and the decay timescale of the neutrino flux relevant for the supernova r-process. Our new bound on the neutrino fluence F
Anders E.   +7 more
core   +2 more sources

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