Results 31 to 40 of about 14,752 (295)

Recycled iron fuels new production in the eastern equatorial Pacific Ocean

Nature Communications, 2017
In the eastern equatorial Pacific, upwelling supplies nitrate in excess of iron relative to phytoplankton requirements. Here, using nitrate isotopes, the authors show that iron recycling in surface waters supports nitrate consumption, lowering surface ...
Patrick A. Rafter, Daniel M. Sigman, Katherine R. M. Mackey   +2 more
doaj   +1 more source

Distinct iron cycling in a Southern Ocean eddy

Nature Communications, 2020
Eddies are common ocean features that isolate large swaths of seawater, but it is unclear how they influence productivity of phytoplankton trapped inside.
Michael J. Ellwood, Robert F. Strzepek, Peter G. Strutton, Thomas W. Trull, Marion Fourquez, Philip W. Boyd   +5 more
doaj   +1 more source

Radiocarbon reservoir effects in human bone collagen from northern Iceland [PDF]

, 2012
Human bone collagen from a series of Icelandic human pagan graves was radiocarbon (14C) dated to aid understanding of early settlement (landnám) chronologies in northern Iceland. These individuals potentially consumed marine protein.
Dugmore, A.J., Cook, G.T., McGovern, T.H., Church, M.J., Ascough, P.L., Gestsdóttir, H., Friðriksson, A., Edwards, K.J., Dunbar, E.   +8 more
core   +1 more source

Iron Composition of a Typical Loess-Paleosol Sequence in Northeast China

Agronomy
Iron isotope compositions, along with the partial extraction of iron in its various forms, can be utilized to investigate the complex interplay of iron migration and transformation with respect to iron isotope patterns.
Zhong-Xiu Sun, Si-Wei Liu, Ying-Ying Jiang   +2 more
doaj   +1 more source

Use of Ra isotopes to deduce rapid transfer of sediment-derived inputs off Kerguelen [PDF]

Biogeosciences, 2015
The Southern Ocean is known to be the largest high-nutrient, low-chlorophyll (HNLC) region of the global ocean due to iron limitation. However, a large phytoplankton bloom develops annually downstream of the Kerguelen Islands, a bloom which is sustained ...
V. Sanial, P. van Beek, B. Lansard, M. Souhaut, E. Kestenare, F. d'Ovidio, M. Zhou, S. Blain   +7 more
doaj   +1 more source

Distinct iron isotopic signatures and supply from marine sediment dissolution

, 2013
Iron (Fe) inputs to the surface ocean may stimulate photosynthesis and have an impact on the uptake of carbon dioxide in the ocean on glacial to inter-glacial timescales of climate change1. Global ocean reservoir-flux models2 indicate that 90% of Fe used
John, Seth G., Conway, TM, John, SG, Mills, Rachel A., Mills, RA, Conway, Tim M., Homoky, WB, Homoky, William B., Homoky, W.B.   +8 more
core   +1 more source

Iron incorporation and post-malaria anaemia. [PDF]

PLoS ONE, 2008
Iron supplementation is employed to treat post-malarial anaemia in environments where iron deficiency is common. Malaria induces an intense inflammatory reaction that stalls reticulo-endothelial macrophagal iron recycling from haemolysed red blood cells ...
Conor P Doherty, Sharon E Cox, Antony J Fulford, Steven Austin, David C Hilmers, Steven A Abrams, Andrew M Prentice   +6 more
doaj   +1 more source

Bulk properties of iron isotopes [PDF]

Physics of Atomic Nuclei, 2007
Nuclear level densities and radiative strength functions (RSFs) in 56Fe and 57Fe were measured using the 57Fe(3He, αγ) and 57Fe(3He, 3He′γ) reactions, respectively, at the Oslo Cyclotron Laboratory. A low-energy enhancement in the RSF below 4-MeV energy was observed. This finding cannot be explained by common theoretical models. In a second experiment,
Algin, E., Schiller, A., Voinov, A., Agvannluvsan, U., Belgya, T., Bernstein, L., Brune, C., Chankova, R., Garrett, P., Grimes, S., Guttormsen, M., Hjorth-Jensen, M., Hornish, M., Johnson, C., Massey, T., Mitchell, G., Rekstad, J., Siem, S., Younes, W.   +18 more
openaire   +1 more source

Empirical evidence for the fractionation of carbon isotopes between diamond and iron carbide from the Earth’s mantle

, 2014
S.M. would like to thank the Engineering and Physical Sciences Research Council, the Diamond Trading Company, and the Department of Physical Sciences, The Open University (UK) for financial support during his time as a PhD student at University College ...
Krispin, Catherine, Crispin, K., Jones, A.P., Verchovsky, Alexander, Guillermier, C., Beard, Andrew, Milledge, H.J., Beard, Andy, Verchovsky, A.B., Jones, Adrian, Franchi, I.A., Milledge, H Judith, Mikhail, Sami, Guillermier, Christalle, Mikhail, S., Beard, Andrew D., Franchi, Ian   +16 more
core   +1 more source

A freshwater diet-derived 14C reservoir effect at the Stone Age sites in the Iron Gates gorge [PDF]

, 2001
Human bones from single inhumation burials and artifacts made from terrestrial mammal (ungulate) bone found in direct association with the skeletons were obtained from the Stone Age site of Schela Cladovei situated just below the Iron Gates Gorge of the ...
McSweeney, Kathleen, Hedges, Robert, Pettitt, Paul B., Bonsall, C., Boroneanț, Vasile, Cook, Gordon, Pettitt, Paul, Bonsall, Clive, Hedges, Robert E. M., Cook, Gordon T., McSweeney, K., Boronean, V.   +11 more
core   +1 more source