isotope fractionation
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2022 ◽  
Vol 579 ◽  
pp. 117338
Author(s):  
Andrea Ricci ◽  
Barbara I. Kleine ◽  
Jens Fiebig ◽  
Jóhann Gunnarsson-Robin ◽  
Kennedy Mativo Kamunya ◽  
...  

2022 ◽  
Vol 12 ◽  
Author(s):  
Simon Blotevogel ◽  
Priscia Oliva ◽  
Laurence Denaix ◽  
Stéphane Audry ◽  
Jerome Viers ◽  
...  

Even though copper (Cu) is an essential plant nutrient, it can become toxic under certain conditions. Toxic effects do not only depend on soil Cu content, but also on environmental and physiological factors, that are not well understood. In this study, the mechanisms of Cu bioavailability and the homeostasis of Vitis vinifera L. cv. Tannat were investigated under controlled conditions, using stable Cu isotope analysis. We measured Cu concentrations and δ65Cu isotope ratios in soils, soil solutions, roots, and leaves of grapevine plants grown on six different vineyard soils, in a 16-week greenhouse experiment. The mobility of Cu in the soil solutions was controlled by the solubility of soil organic matter. No direct relationship between Cu contents in soils or soil solutions and Cu contents in roots could be established, indicating a partly homeostatic control of Cu uptake. Isotope fractionation between soil solutions and roots shifted from light to heavy with increasing Cu exposure, in line with a shift from active to passive uptake. Passive uptake appears to exceed active uptake for soil solution concentrations higher than 270 μg L–1. Isotope fractionation between roots and leaves was increasingly negative with increasing root Cu contents, even though the leaf Cu contents did not differ significantly. Our results suggest that Cu isotope analysis is a sensitive tool to monitor differences in Cu uptake and translocation pathways even before differences in tissue contents can be observed.


Author(s):  
Da Wang ◽  
Richard Carlson

The short-lived 146Sm-142Nd isotope system traces key early planetary differentiation processes that occurred during the first 500 million-years of solar system history. The variations of 142Nd/144Nd in terrestrial samples, typically...


2022 ◽  
Vol 317 ◽  
pp. 91-105
Author(s):  
Roberta Parigi ◽  
Ning Chen ◽  
Joel W. Reid ◽  
Carol J. Ptacek ◽  
David W. Blowes

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