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  • 1
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    Natural iron isotope variations in human blood (2002)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2002-03-16
    Description: Isotopic analysis of human blood and liver and muscle tissue indicates that each individual bears a long-term iron (Fe) isotope signature in the blood. Blood and tissue differ slightly in isotopic composition and are depleted by up to 2.6 per mil in 56Fe relative to 54Fe when compared to dietary Fe. The 56Fe/54Fe isotope ratio in the blood of males is, on average, lower by 0.3 per mil than that of females. These results suggest that Fe isotope effects in the blood reflect differences in intestinal Fe absorption between individuals and genotypes.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Walczyk, Thomas -- von Blanckenburg, Friedhelm -- New York, N.Y. -- Science. 2002 Mar 15;295(5562):2065-6.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Laboratory of Human Nutrition, Institute of Food Sciences, Swiss Federal Institute of Technology (ETH) Zurich, Seestrasse 72, CH-8803 Ruschlikon, Switzerland. thomas.walczyk@ilw.agrl.ethz.ch〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/11896276" target="_blank"〉PubMed〈/a〉
    Keywords: Adult ; Animals ; Child ; Female ; Food Analysis ; Humans ; Infant ; Intestinal Absorption ; Iron/*blood/metabolism ; Iron Isotopes/*blood/metabolism ; Iron, Dietary/administration & dosage/*metabolism ; Liver/metabolism ; Male ; Meat ; Muscles/metabolism ; Reference Values ; Sex Characteristics
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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  • 2
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    Journal club (2009)
    Nature Publishing Group (NPG)
    Details
    Publication Date: 2009-09-19
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉von Blanckenburg, Friedhelm -- England -- Nature. 2009 Jul 16;460(7253):309. doi: 10.1038/460309e.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉GFZ German Research Centre for Geosciences, Potsdam, Germany.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/19606103" target="_blank"〉PubMed〈/a〉
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Published by Nature Publishing Group (NPG)
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  • 3
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    Long-term stability of global erosion rates and weathering during late-Cenozoic cooling (2010)
    Nature Publishing Group (NPG)
    Details
    Publication Date: 2010-05-14
    Description: Over geologic timescales, CO(2) is emitted from the Earth's interior and is removed from the atmosphere by silicate rock weathering and organic carbon burial. This balance is thought to have stabilized greenhouse conditions within a range that ensured habitable conditions. Changes in this balance have been attributed to changes in topographic relief, where varying rates of continental rock weathering and erosion are superimposed on fluctuations in organic carbon burial. Geological strata provide an indirect yet imperfectly preserved record of this change through changing rates of sedimentation. Widespread observations of a recent (0-5-Myr) fourfold increase in global sedimentation rates require a global mechanism to explain them. Accelerated uplift and global cooling have been given as possible causes, but because of the links between rates of erosion and the correlated rate of weathering, an increase in the drawdown of CO(2) that is predicted to follow may be the cause of global climate change instead. However, globally, rates of uplift cannot increase everywhere in the way that apparent sedimentation rates do. Moreover, proxy records of past atmospheric CO(2) provide no evidence for this large reduction in recent CO(2) concentrations. Here we question whether this increase in global weathering and erosion actually occurred and whether the apparent increase in the sedimentation rate is due to observational biases in the sedimentary record. As evidence, we recast the ocean dissolved (10)Be/(9)Be isotope system as a weathering proxy spanning the past approximately 12 Myr (ref. 14). This proxy indicates stable weathering fluxes during the late-Cenozoic era. The sum of these observations shows neither clear evidence for increased erosion nor clear evidence for a pulse in weathered material to the ocean. We conclude that processes different from an increase in denudation caused Cenozoic global cooling, and that global cooling had no profound effect on spatially and temporally averaged weathering rates.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Willenbring, Jane K -- von Blanckenburg, Friedhelm -- England -- Nature. 2010 May 13;465(7295):211-4. doi: 10.1038/nature09044.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Deutsches GeoForschungsZentrum GFZ, Section 3.4: Earth Surface Geochemistry, Telegrafenberg, D-14473 Potsdam, Germany. jane.willenbring@sas.upenn.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/20463736" target="_blank"〉PubMed〈/a〉
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Published by Nature Publishing Group (NPG)
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  • 4
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    Paleoerosion Rates from Cosmogenic 10Be in a 1.3 Ma Terrace Sequence: Response of the River Meuse to Changes in Climate and Rock Uplift (2004)
    University of Chicago Press
    Details
    Publication Date: 2004-03-01
    Print ISSN: 0022-1376
    Electronic ISSN: 1537-5269
    Topics: Geosciences
    Published by University of Chicago Press
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