Thomas Walczyk

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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(More)
Persistent impairments in the regulation of intestinal iron absorption result in iron deficiency or iron accumulation in the long term. Diagnosis remains difficult unless pathological symptoms develop as iron absorption varies strongly between meals and days. Variations in the natural iron isotopic composition of whole blood have recently been suggested as(More)
We recently showed in an animal model that iron isotopic composition varies substantially between different organs. For instance, iron in ferritin-rich organs—such as the major storage tissues liver, spleen, and bone marrow—contain a larger fraction of the heavy iron isotopes compared with other tissues, including blood. As a consequence, partitioning of(More)
Measurement of deuterium oxide by infrared spectroscopy and isotope ratio mass spectrometry for quantifying daily milk intake in breastfed infants and maternal body fat Use of stable calcium isotopes (42 Ca & 44 Ca) in evaluation of calcium absorption in Beijing adolescents with low vitamin D status —W. Bulk and compound specific analysis of stool lipid(More)
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