Special Issue dedicated to Professor Hanns-Ludwig Schmidt on the occasion of his 85th birthday

References

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• Schmidt H-L, Werner RA, Roßmann A. 18O Pattern and biosynthesis of natural plant products. Phytochemistry. 2001;58:9–32. doi: 10.1016/S0031-9422(01)00017-6
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• Werner RA, Schmidt H-L. The in vivo nitrogen isotope discrimination among organic plant compounds. Phytochemistry. 2002;61:465–484. doi: 10.1016/S0031-9422(02)00204-2
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• Schmidt H-L, Werner RA, Eisenreich W. Systematics of 2H patterns in natural compounds and its importance for the elucidation of biosynthetic pathways. Phytochem Rev. 2003;2:61–85. doi: 10.1023/B:PHYT.0000004185.92648.ae
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• Gleixner G, Schmidt H-L. Carbon isotope effects on the fructose-1,6-bisphosphate aldolase reaction, origin for non-statistical 13C distributions in carbohydrates. J Biol Chem. 1997;272:5382–5387. doi: 10.1074/jbc.272.9.5382
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• Weilacher T, Gleixner G, Schmidt H-L. Carbon isotope pattern in purine alkaloids a key to isotope discriminations in C1 compounds. Phytochemistry. 1996;41:1073–1077. doi: 10.1016/0031-9422(95)00757-1
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• Metzler S, Stobbe E, Kranz C, Schmidt H-L, Winkler FJ, Wolfram G. Einfluß des natürlichen Isotopengehaltes von Nährstoffen auf den Untergrund bei 13C-Atemtests. Z Ernährungswiss. 1983;22:107–115. doi: 10.1007/BF02026207
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• Metges C, Kempe K, Schmidt H-L. Dependence of the carbon-isotope contents of breath carbon dioxide, milk, serum, and rumen fermentation products on the 13C value of food in dairy cows. Br J Nutr. 1990;63:187–196. doi: 10.1079/BJN19900106
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• Metges CC, Schmidt H-L, Eichinger H. Use of naturally enriched mixed food in 13C breath tests applied in young sucking calves. Br J Nutr. 1992;67:43–55. doi: 10.1079/BJN19920007
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• Bos C, Metges CC, Gaudichon C, Petzke KJ, Pueyo ME, Morens C, Everwand J, Benamouzig R, Tomé D. Postprandial kinetics of dietary amino acids are the main determinant of their metabolism after soy or milk protein ingestion in humans. J Nutr. 2003;133:1308–1315.
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• Metges CC. Contribution of microbial amino acids to amino acid homeostasis of the host. J Nutr. 2000;130:1857S–1864S.
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• Amberger A, Schmidt H-L. The natural isotope content of nitrate as an indicator of its origin. Geochim Cosmochim Acta. 1987;51:2699–2705. doi: 10.1016/0016-7037(87)90150-5
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• Boettcher J, Strebel O, Voerkelius S, Schmidt H-L. Using isotope fractionation of nitrate nitrogen and nitrate oxygen for evaluation of microbial denitrification in a sandy aquifer. J Hydrol. 1990;114:413–424. doi: 10.1016/0022-1694(90)90068-9
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• Sachse D, Billault I, Bowen GJ, Chikaraishi Y, Dawson TE, Feakins SJ, Freeman KH, Magill CR, McInerney FA, van der Meer MTJ, Polissar P, Robins RJ, Sachs JP, Schmidt H-L, Sessions AL, White JWC, West JB, Kahmen A. Molecular paleohydrology: Interpreting the hydrogen-isotopic composition of lipid biomarkers from photosynthesizing organisms. Ann Rev Earth Planet Sci. 2012;40:221–249. doi: 10.1146/annurev-earth-042711-105535
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• Schmidt H-L, Werner RA, Eisenreich W, Fuganti C, Fronza G, Remaud G, Robins RJ. The prediction of isotopic patterns in phenylpropanoids from their precursors and the mechanism of the NIH-shift: Basis of the isotopic characteristics of natural aromatic compounds. Phytochemistry. 2006;67:1094–1103. doi: 10.1016/j.phytochem.2006.03.014
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• Balzer A, Gleixner G, Grupe G, Schmidt H-L, Schramm S, Turban-Just S. In vitro decomposition of bone collagen by soil bacteria: the implications for stable isotope analysis in archaeometry. Archaeometry. 1997;39:415–429. doi: 10.1111/j.1475-4754.1997.tb00817.x
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• Turban-Just S, Schramm S. Stable carbon and nitrogen isotope ratios of individual amino acids give new insights into bone collagen degradation. Bull Soc Géol Fr. 1998;169:109–114.
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• Cramer T, Germann K, Winkler FJ, Schmidt H-L. Isotope-geochemical and mineralogical-petrographic characteristics of the Pergamon altar marble. Isot Environ Health Stud. 1997;33:169–176.
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• Gleixner G, Schmidt H-L. On-line determination of group-specific isotope ratios in model compounds and aquatic humic substances by coupling pyrolysis to GC-C-IRMS. In: Stankiewicz BA, van Bergen PF, editors. Nitrogen-containing macromolecules in the bio- and geosphere. Vol. 707, ACS Symposium Series. Washington, DC: American Chemical Society; 1998. p. 34–46.
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• Gleixner G, Kracht O, Schmidt H-L. Group specific isotope ratios of humic substances. In: Swift SS, Spark, KM, editors. Understanding and managing organic matter in soils, sediments and waters: Proceedings of the 9th International Conference of the International Humic Substances Society. University of Adelaide, Adelaide, Australia, 1998 September 21–25. St. Paul, MN: International Humic Substance Society; 2001. p. 195–201.
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• Gleixner G, Kracht O, Schmidt H-L, Schulze E-D. Isotopic evidence for the origin and formation of refractory organic substances. In: Frimmel FH, Abbt-Braun G, Heumann KG, Hock B, Lüdemann H-D, Spiteller M, editors. Refractory organic substances (ROS) in the environment. Weinheim: Wiley-VCH Verlag GmbH; 2002. p. 146–162.
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• Tanz N, Schmidt H-L. δ34S-value measurements in food origin assignments and sulfur isotope fractionations in plants and animals. J Agric Food Chem. 2010;58:3139–3146. doi: 10.1021/jf903251k
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• Nakamura K, Schoeller DA, Winkler FJ, Schmidt H-L. Geographical variations in the carbon isotope composition of the diet and hair in contemporary man. Biol Mass Spectrom. 1982;9:390–394. doi: 10.1002/bms.1200090906
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• Ihle E, Schmidt H-L. Multielement isotope analysis on drugs of abuse – possibility of their origin assignment. Isot Environ Health Stud. 1995;32:226–228.
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• Zimmer E. Anwendung der Isotopenverhältnismessung zu vergleichenden Herkunftsuntersuchungen an Arzneistoffen und illegalen Drogen [PhD thesis]. TU München-Weihenstephan; 1999.
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• Fronza G, Fuganti C, Schmidt H-L, Werner RA. The δ18O-value of the p-OH group of l-tyrosine permits the assignment of its origin to plant or animal sources. Eur Food Res Technol. 2002;215:55–58. doi: 10.1007/s00217-002-0533-y
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• Tanz N, Werner RA, Eisenreich W, Schmidt H-L. Assessment of enzymatic methods in the δ18O value determination of the l-tyrosine p-hydroxy group for proof of illegal meat and bone meal feeding to cattle. J Agric Food Chem. 2011;59:9475–9483. doi: 10.1021/jf201217r
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• Winkler FJ, Schmidt H-L. Einsatzmöglichkeiten der 13C-Isotopen-Massenspektrometrie in der Lebensmitteluntersuchung. Z Lebensm Unters Forsch. 1980;171:85–94. doi: 10.1007/BF01140746
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• Kornexl B, Medina R, Schmidt H-L. A sensitive method for the fast and simultaneous determination of δ15N-values and δ18O-values in nitrate. Isotopenpraxis. 1994;30:215–218.
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• Werner RA, Kornexl BE, Schmidt H-L. On-line determination of δ18O-values of organic substances. Anal Chim Acta. 1996;319:159–164. doi: 10.1016/0003-2670(95)00468-8
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• Schmidt H-L, Kempe K, Demmelmair H, Medina R. On-line gas chromatography and isotope ratio mass spectrometry of organic compounds in the range of natural abundances. In: Matsuo T, editor. Proceedings of the Kyoto'92 International Conference on Biological Mass Spectrometry. Kyoto International Conference Hall, Kyoto, Japan, 1992 September 20–24. Kyoto: San-ei Publishing Co.; 1993. p. 382–383.
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• Sieper H-P, Kupka H-J, Williams T, Roßmann A, Rummel S, Tanz N, Schmidt H-L. A measuring system for the fast simultaneous isotope ratio and elemental analysis of carbon, hydrogen, nitrogen and sulfur in food commodities and other biological material. Rapid Comm Mass Spectrom. 2006;20:2521–2527. doi: 10.1002/rcm.2619
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• Sieper H-P, Kupka H-J, Lange L, Roßmann A, Tanz N, Schmidt H-L. Essential methodological improvements in the oxygen isotope ratio analysis of N-containing organic compounds. Rapid Comm Mass Spectrom. 2010;24:2849–2858. doi: 10.1002/rcm.4714
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