Results 21 to 30 of about 930,809 (352)

Study on behaviors of PO₄^3- in the sediment of the West Lake using isotope trace technique

浙江大学学报. 农业与生命科学版, 2002
Under laboratory condition, the technique of the isotope trace was applied to investigate 32P-PO43- behaviors in water/sediments of the West Lake. The results showed that 32P-PO43- in water/sediments declined exponentialy with time.
TANG Meng-cheng
doaj   +1 more source

Freezing and chemical preservatives alter the stable isotope values of carbon and nitrogen of the Asiatic clam (Corbicula fluminea) [PDF]

, 2011
We tested the impacts of most common sample preservation methods used for aquatic sample materials on the stable isotope ratios of carbon and nitrogen in clams, a typical baseline indicator organism for many aquatic food web studies utilising stable ...
Aurélia Martino, B Fry, B Kelly, BJ Peterson, CJ Sweeting, DM Post, Dorothée Kopp, Frédéric Santoul, H Feuchtmayr, HC Sarakinos, J Dannheim, J Syväranta, J Syväranta, Jari Syväranta, KL Bosley, LM Barrow, M Ventura, MM Mullin, MS Edwards, NO Ogawa, Régis Céréghino, S Carabel, S Kaehler   +22 more
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Measurement of calcium isotopes (δ44Ca) using a multicollector TIMS technique [PDF]

, 2002
We propose a new“multicollector technique” for the thermal ionization mass spectrometer (TIMS) measurement of calcium (Ca) isotope ratios improving average internal statistical uncertainty of the 44Ca/40Ca measurements by a factor of 2–4 and average ...
Bock, Barbara, Eisenhauer, Anton, Gussone, Nikolaus, Hansen, B. T., Heuser, Alexander, Nägeler, Thomas F.   +5 more
core   +1 more source

Small differences in root distributions allow resource niche partitioning

Ecology and Evolution, 2020
Deep roots have long been thought to allow trees to coexist with shallow‐rooted grasses. However, data demonstrating how root distributions affect water uptake and niche partitioning are uncommon.
Andrew Kulmatiski, Karen H. Beard, Martin C. Holdrege, Edmund C. February   +3 more
doaj   +1 more source

Stable oxygen and carbon isotope compositional fields for skeletal and diagenetic components in New Zealand Cenozoic nontropical carbonate sediments and limestones: a synthesis and review [PDF]

, 1996
The stable oxygen isotope composition (d¹⁸O) of a precipitated carbonate depends mainly on the isotope composition, salinity, and temperature of the host fluid, whereas the stable carbon isotope composition (d¹³C) reflects the source of CO2 for ...
Nelson, Campbell S., Smith, Abigail M.
core   +2 more sources

Chemostratigraphy of Neoproterozoic carbonates: implications for 'blind dating' [PDF]

, 2001
The delta C-13(carb) and Sr-87/Sr-86 secular variations in Neoproteozoic seawater have been used for the purpose of 'isotope stratigraphy' but there are a number of problems that can preclude its routine use.
Aharon P., Anthony E. Fallick, Anton B. Kuznetsov, Bowring S.A., Brand U., Brasier M.D., Brasier M.D., Brasier M.D., Burns S.J., Calver C.R., Corsetti F.A., Fairchild I.J., Fairchild I.J., Gao G., Gorokhov I.M., Gorokhov I.M., Gorokhov I.M., Grotzinger J.P., Grotzinger J.P., Hoffman P.F., Igor M. Gorokhov, Kaufman A.J., Kennedy M.J., Kirschvink J.L., Knoll A.H., Knoll A.H., Knoll A.H., Kupecz J.A., Kuznetsov A.B., Kuznetsov A.B., Lambert I.B., Magaritz M., McArthur J.M., McArthur J.M., McCulloch M.T., Melezhik V.A., Morton J.P., Ovchinnikova G.V., Pelechaty S.M., Podkovyrov V.N., Pokrovsky B.G., Pokrovsky B.G., Pokrovsky B.G., Saylor B.Z., Semikhatov M.A., Singh U., Smith L.H., Tronnes R.G., Tucker M.E., Tucker M.E., Veizer J., Veizer J., Victor A. Melezhik, Wada S.-I., Walter M.R., Wang Da-Rui   +55 more
core   +1 more source

Inhibition of cardiac PERK signaling promotes peripartum cardiac dysfunction

Scientific Reports, 2021
Peripartum cardiomyopathy (PPCM) is a life-threatening heart failure occurring in the peripartum period. Although mal-angiogenesis, induced by the 16-kDa N-terminal prolactin fragment (16 K PRL), is involved in the pathogenesis, the effect of full-length
Takashi Shimizu, Akashi Taguchi, Yoshiki Higashijima, Yasuharu Kanki, Ryo Nakaki, Yoshihiro Urade, Youichiro Wada   +6 more
doaj   +1 more source

The Stalagmite Record of Southern Arabia: Climatic Extremes, Human Evolution and Societal Development

Frontiers in Earth Science, 2021
The fluctuating climatic conditions of the Saharo-Arabian deserts are increasingly linked to human evolutionary events and societal developments. On orbital timescales, the African and Indian Summer Monsoons were displaced northward and increased ...
Samuel Luke Nicholson, Matthew J. Jacobson, Rob Hosfield, Dominik Fleitmann   +3 more
doaj   +1 more source

Intensive rainfall recharges tropical groundwaters

Environmental Research Letters, 2015
Dependence upon groundwater to meet rising agricultural and domestic water needs is expected to increase substantially across the tropics where, by 2050, over half of the world’s population is projected to live.
Scott Jasechko, Richard G Taylor
doaj   +1 more source

High-Resolution in vivo Imaging of Xylem-Transported CO2 in Leaves Based on Real-Time 11C-Tracing

Frontiers in Forests and Global Change, 2019
Plant studies using the short-lived isotope 11C to label photosynthate via atmospheric carbon dioxide (CO2), have greatly advanced our knowledge about the allocation of recent photosynthate from leaves to sinks.
Michiel Hubeau, Michael R. Thorpe, Jens Mincke, Jens Mincke, Jasper Bloemen, Ingvar Bauweraerts, Peter E. H. Minchin, Veerle De Schepper, Filip De Vos, Christian Vanhove, Stefaan Vandenberghe, Kathy Steppe   +11 more
doaj   +1 more source