Isotope Enrichment by the Photoexcitation of Specific Isotopes

1952 ◽  
Vol 20 (11) ◽  
pp. 1817-1817 ◽  
Author(s):  
C. C. McDonald ◽  
H. E. Gunning
Keyword(s):  
Isotope Enrichment

scholarly journals 41Ca Concentrations in Modern Bone and Their Implications for Dating

Radiocarbon ◽  
1989 ◽  
Vol 31 (03) ◽  
pp. 305-310 ◽  
Author(s):  
Roy Middleton ◽  
David Fink ◽  
Jeffrey Klein ◽  
Pankaj Sharma
Keyword(s):  
Mass Spectrometry ◽  
Accelerator Mass Spectrometry ◽  
Isotope Enrichment ◽  
Terrestrial Rock ◽  
Order Of Magnitude ◽  
Cow Bone ◽  
Good Agreement

We have made the first measurements without pre-enrichment of 41Ca in terrestrial rock and bone samples using accelerator mass spectrometry. Although the results in tufa deposits from Egypt are in good agreement with the saturation value of 8×10-15 predicted by Raisbeck and Yiou (1979), the average 41Ca:40Ca ratio of 2×10-15 (range: 0.6 to 4.2×10-15) that we measure in modern bone is an order of magnitude lower than that obtained previously by Henning, et al (1987) on a cow bone that was measured using AMS following isotope enrichment. The low value and the variability (more than a factor of seven) of the 41Ca:40Ca ratio in modern bone make the possibility of dating bones using 41Ca unlikely.

Bacterial overexpression, isotope enrichment, and NMR analysis of the N-terminal domain of human apolipoprotein E

1997 ◽  
Vol 75 (1) ◽  
pp. 45-53 ◽  
Author(s):  
C A Fisher ◽  
J Wang ◽  
G A Francis ◽  
B D Sykes ◽  
C M Kay ◽  
...  
Keyword(s):  
Apolipoprotein E ◽  
Isotope Enrichment ◽  
Nmr Analysis ◽  
Human Apolipoprotein ◽  
Terminal Domain

Oxygen isotope enrichment (Δ18O) reflects yield potential and drought resistance in maize

2009 ◽  
Vol 32 (11) ◽  
pp. 1487-1499 ◽  
Author(s):  
LLORENÇ CABRERA-BOSQUET ◽  
CIRO SÁNCHEZ ◽  
JOSÉ LUIS ARAUS
Keyword(s):  
Oxygen Isotope ◽  
Drought Resistance ◽  
Yield Potential ◽  
Isotope Enrichment

A new method to track seed dispersal and recruitment using15N isotope enrichment

Ecology ◽  
2009 ◽  
Vol 90 (12) ◽  
pp. 3516-3525 ◽  
Author(s):  
Tomás A. Carlo ◽  
Joshua J. Tewksbury ◽  
Carlos Martínez del Río
Keyword(s):  
Seed Dispersal ◽  
New Method ◽  
Isotope Enrichment

s-Process Os isotope enrichment in ureilites by planetary processing

2015 ◽  
Vol 431 ◽  
pp. 110-118 ◽  
Author(s):  
S. Goderis ◽  
A.D. Brandon ◽  
B. Mayer ◽  
M. Humayun
Keyword(s):  
Isotope Enrichment ◽  
Os Isotope

scholarly journals Exploring the Utility of Compound-Specific Isotope Analysis for Assessing Ferrous Iron-Mediated Reduction of RDX in the Subsurface

2020 ◽  
Author(s):  
Yiran Tong ◽  
Matthew J. Berens ◽  
Bridget A. Ulrich ◽  
Jakov Bolotin ◽  
Jennifer H. Strehlau ◽  
...  
Keyword(s):  
Groundwater Contamination ◽  
Ferrous Iron ◽  
Chemical Reduction ◽  
Isotope Analysis ◽  
Enrichment Factors ◽  
Isotope Enrichment ◽  
Compound Specific Isotope Analysis ◽  
A Site ◽  
Mediated Reduction

This work determines isotope enrichment factors for RDX during reduction by iron minerals. The values determined are used to assess the transformation of RDX at a site with groundwater contamination and in laboratory column reactors simulating in situ chemical reduction treatment.

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