Publications by Dr. Roland A. Werner

Peer-reviewed journals

Xia Y., Lalande J., Badeck F.-W., Girardin C., Bathellier C., Gleixner G., Werner R.A., Ghiasi S., Faucon M., Cosnier K., Fresneau C., Tcherkez G. and Ghashghaie J. (2024) Nitrogen nutrition effects on δ¹³C of plant respired CO₂ are mostly caused by concurrent changes in organic acid utilisation and remobilisation. Plant, Cell and Environment, doi: external page 10.1111/pce.15062
Gessler A., Wieloch T., Saurer M., Lehmann M.M., Werner R.A. and Kammerer B. (2024) The marriage between stable isotope ecology and plant metabolomics – new perspectives for metabolic flux analysis and the interpretation of ecological archives. New Phytologist 244: 21-31, doi: external page 10.1111/nph.19973
Lehmann M.M., Schuler P., Werner R.A., Saurer M., Wiesenberg G.L.B., and Cormier M.-A. (2024) Biochemical and biophysical drivers of the hydrogen isotopic composition of carbohydrates and acetogenic lipids. Science Advances 10: eadl3591, doi: external page 10.1126/sciadv.adl3591
Gao D., Luster J., Zürcher A., Arend M., Bai E., Gessler A., Rigling A., Schaub M., Hartmann M., Werner R.A., Joseph J., Poll C., and Hagedorn F. (2024) Drought resistance and resilience of rhizosphere communities in forest soils from the cellular to ecosystem scale – insights from ¹³C pulse labeling. New Phytologist 242: 960-974, doi: external page 10.1111/nph.19612
Solly E.F., Jaeger A.C.H., Barthel M., Werner R.A., Zürcher A., Hagedorn F., Six J. and Hartmann M. (2023) Water limitation intensity shifts carbon allocation dynamics in Scots pine mesocosms. Plant Soil 490: 499-519, doi: external page 10.1007/s11104-023-06093-5
Li Y., Riedl A., Eugster W., Buchmann N., Cernusak L.A., Lehmann M.M., Werner R.A. and Aemisegger F. (2023) The role of radiative cooling and leaf wetting in air–leaf water exchange during dew and radiation fog events in a temperate grassland. Agricultural and Forest Meteorology 328: 109256, doi: external page 10.1016/j.agrformet.2022.109256
Werner R.A. and Cormier M.-A. (2022) Isotopes – terminology, definitions and properties. In: Siegwolf RTW, Brooks JR, Roden J, Saurer M (eds.) Stable isotopes in tree rings: Inferring physiological, climatic and environmental responses. Springer Nature, Cham, Switzerland, pp 253-289, doi: external page 10.1007/978-3-030-92698-4_8
Brooks J.R., Rugh W. and Werner R.A. (2022) Tree-ring stable isotope measurements: The role of quality assurance and quality control to ensure high quality data. In: Siegwolf RTW, Brooks JR, Roden J, Saurer M (eds.) Stable isotopes in tree rings: Inferring physiological, climatic and environmental responses. Springer Nature, Cham, Switzerland, pp 191-213, doi: external page 10.1007/978-3-030-92698-4_6
Gruber W., Magyar P., Mitrovic I., Zeyer K., Vogel M., von Känel L.B., Werner R.A., Morgenroth E., Lehmann M.F., Braun D., Joss A. and Mohn, J. (2022) Tracing N₂O formation in full-scale wastewater treatment with natural abundance isotopes indicates control by organic substrate and process settings. Water Research X 15: 100130, doi: external page 10.1016/j.wroa.2022.100130
Wieloch T., Sharkey T.D., Werner R.A. and Schleucher J. (2022) Intramolecular carbon isotope signals reflect metabolite allocation in plants. J Exp Bot 73: 2558-2575, doi: external page 10.1093/jxb/erac028
Schuler P., Cormier M.-A., Werner R.A., Buchmann N., Gessler A., Vitali V., Saurer M. and Lehmann M.M. (2021) A high-temperature water vapor equilibration method to determine non-exchangeable hydrogen isotope ratios of sugar, starch and cellulose. Plant Cell Environ 45: 12-22, doi: external page 10.1111/pce.14193
Wieloch T., Werner R.A. and Schleucher J. (2021) Carbon flux around leaf-cytosolic glyceraldehyde-3-phosphate dehydrogenase introduces a ¹³C signal in plant glucose. J Exp Bot 72: 7136-7144, doi: external page 10.1093/jxb/erab316
Gao D., Joseph J., Werner R.A., Brunner I., Zürcher A., Hug C., Wang A., Zhao C., Bai E., Meusburger K., Gessler A. and Hagedorn F. (2021) Drought alters the carbon footprint of trees in soils—tracking the spatio-temporal fate of ¹³C-labelled assimilates in the soil of an old-growth pine forest. Global Change Biol 27: 2491-2506, doi: external page 10.1111/gcb.15557
Ghiasi S., Lehmann M., Badeck F.-W., Ghashghaie J., Hänsch R., Meinen R., Streb S., Hüdig M., Ruckle M., Carrera D.A., Siegwolf R.T.W., Buchmann N. and Werner R. (2021) Nitrate and ammonium differ in their impact on δ¹³C of plant metabolites and respired CO₂ from tobacco leaves. Isotopes Environ Health Stud 57: 11-34, doi: external page 10.1080/10256016.2020.1810683
Kronenberg L., Yates S., Ghiasi S., Roth L., Friedli M., Ruckle M.E., Werner R.A., Tschurr F., Binggeli M., Buchmann N., Studer B. and Walter A. (2020) Rethinking temperature effects on leaf growth, gene expression and metabolism: Diel variation matters. Plant Cell Environ 44: 2262-2276, doi: external page 10.1111/pce.13958
Baumgartner S., Barthel M., Drake T.W., Bauters M., Makelele I.A., Mugula J.K., Summerauer L., Gallarotti N., Ntaboba L.C., Van Oost K., Boeckx P., Doetterl S., Werner R.A., Six J. (2020) Seasonality, drivers, and isotopic composition of soil CO₂ ﬂuxes from tropical forests of the Congo Basin. Biogeosciences 17: 6207-6218, doi: external page 10.5194/bg-17-6207-2020
Lehmann M.M., Egli M., Brinkmann N., Werner R.A., Saurer M., Kahmen A. (2020) Improving the extraction and purification of leaf and phloem sugars for oxygen isotope analyses. Rapid Comm Mass Spectrom 34: e8854, doi: external page 10.1002/rcm.8854
Joseph J., Gao D., Backes B., Bloch C., Brunner I., Gleixner G., Haeni M., Hartmann H., Hoch G., Hug C., Kahmen A., Lehmann M.M., Li M.-H., Luster J., Peter M., Poll C., Rigling A., Rissanen K.A., Ruehr N.K., Saurer M., Schaub M., Schönbeck L., Stern B., Thomas F.M., Werner R.A., Werner W., Wohlgemuth T., Hagedorn F. and Gessler A. (2020) Rhizosphere activity in an old-growth forest reacts rapidly to changes in soil moisture and shapes whole-tree carbon allocation. Proc Natl Acad Sci USA doi: external page 10.1073/pnas.2014084117
Van de Broek M., Ghiasi S., Decock C., Hund A., Abiven S., Friedli C., Werner R.A. and Six J. (2020) The soil organic carbon stabilization potential of old and new wheat cultivars: a ¹³CO₂-labeling study. Biogeosciences 17, 2971-2986 doi: external page 10.5194/bg-17-2971-2020
Lehmann M.M., Egli M., Brinkmann N., Werner R.A. and Kahmen A. (2020) Improving the extraction and purification of leaf and phloem sugars for oxygen isotope analyses. Rapid Commun Mass Spectrom 34, doi: external page 10.1002/rcm.8854
Parepa M., Kahmen A., Werner R.A., Fischer M. and Bossdorf O. (2019) Invasive knotweed has greater nitrogen-use efficiency than native plants: evidence from a ¹⁵N pulse-chasing experiment. Oecologia 191, 389-396 doi: external page 10.1007/s00442-019-04490-1
Mannerheim N., Werner R.A. and Buchmann N. (2019) Measurement precision and accuracy of high artificial enrichment ¹⁵N and ¹³C tracer samples. Rapid Commun Mass Spectrom 33, 1153-1163 doi: external page 10.1002/rcm.8451
Lehmann M.M., Ghiasi S., George G.M., Cormier M.-A., Gessler A., Saurer M. and Werner R.A. (2019) Influence of starch deficiency on photosynthetic and post-photosynthetic carbon isotope fractionations. J Exp Bot 70, 1829-1841 doi: external page 10.1093/jxb/erz045
Cormier M.-A., Werner R.A., Leuenberger M.C. and Kahmen A. (2019) ²H-enrichment of cellulose and n-alkanes in heterotrophic plants. Oecologia 189, 365-373 doi: external page 10.1007/s00442-019-04338-8
Cormier M.-A., Werner R.A., Sauer P.E., Gröcke D.R., Leuenberger M.C., external page Wieloch T., external page Schleucher J. and Kahmen A. (2018) ²H‐fractionations during the biosynthesis of carbohydrates and lipids imprint a metabolic signal on the d²H values of plant organic compounds. New Phytol 218, 479-491 doi: external page 10.1111/nph.15016
Mohn J., Gutjahr W., Toyoda S., Harris E., Ibraim E., Geilmann H., Schleppi P., Kuhn T., Lehmann M.F., Decock C., Werner R.A., Yoshida N. and Brand W.A. (2016) Reassessment of the NH₄NO₃ thermal decomposition technique for calibration of the N₂O isotopic composition. Rapid Commun Mass Spectrom 30, 2487-2496 doi: external page 10.1002/rcm.7736
Lehmann M.M., Wegener F., Barthel M., Maurino V.G., Siegwolf R.T.W., Buchmann N., Werner C. and Werner R.A. (2016) Metabolic fate of the carboxyl groups of malate and pyruvate and their influence on d¹³C of leaf respired CO₂ during light enhanced dark respiration. Front Plant Sci 7, Art. No. 739 doi: external page 10.3389/fpls.2016.00739
Lehmann M.M., Wegener F., Werner R.A. and Werner C. (2016) Diel variations in carbon isotopic composition and concentration of organic acids and their impact on plant dark respiration in different species. Plant Biol 18, 776-784 doi: external page 10.1111/plb.12464
Schimmelmann A., Qi H., Coplen T.B., Brand W.A., Fong J., Meier-Augenstein W., Kemp H.F., Toman B., Ackermann A., Assonov S., Aerts-Bijma A.T., Brejcha R., Chikaraishi Y., Darwish T., Elsner M., Gehre M., Geilmann H., Gröning M., Hélie J.-F., Herrero-Martín S., Meijer H.A.J., Sauer P.E., Sessions A.L. and Werner R.A. (2016) Organic reference materials for hydrogen, carbon, and nitrogen stable isotope-ratio measurements: Caffeines, n-alkanes, fatty acid methyl esters, glycines, L-valines, polyethylenes, and oils. Anal Chem 88, 4294-4302 doi: external page 10.1021/acs.analchem.5b04392
Supplementary data sets available at:
- external page https://figshare.com/articles/Organic_Reference_Materials_for_Hydrogen_Carbon_and_Nitrogen_Stable_Isotope_Ratio_Measurements_Caffeines_i_n_i_Alkanes_Fatty_Acid_Methyl_Esters_Glycines_l_Valines_Polyethylenes_and_Oils/3145033
- external page https://figshare.com/articles/Organic_Reference_Materials_for_Hydrogen_Carbon_and_Nitrogen_Stable_Isotope_Ratio_Measurements_Caffeines_i_n_i_Alkanes_Fatty_Acid_Methyl_Esters_Glycines_l_Valines_Polyethylenes_and_Oils/3145036
Pati S.G., Bolotin J., Brennwald M.S., Kohler H-P.E., Werner R.A. and Hofstetter T.B. (2016) Measurement of oxygen isotope ratios (¹⁸O/¹⁶O) of aqueous O₂ in small samples by gas chromatography/isotope ratio mass spectrometry. Rapid Commun Mass Spectrom 30, 684-690 doi: external page 10.1002/rcm.7481
Rinne K.T., Saurer M., Kirdyanov A.V., Loader N.J., Bryukhanova M.V., Werner R.A. and Siegwolf R.T.W. (2015) The relationship between needle sugar carbon isotope ratios and tree rings of larch in Siberia. Tree Physiol 35, 1192-1205 doi: external page 10.1093/treephys/tpv096
Lehmann M.M., Rinne K.T., Blessing C., Siegwolf R.T.W., Buchmann N. and Werner R.A. (2015) Malate as a key carbon source of leaf dark-respired CO₂ across different environmental conditions in potato plants. J Exp Bot 66, 5769-5781 doi: external page 10.1093/jxb/erv279
Schmidt H.-L., Robins R.J. and Werner R.A. (2015) Multi-factorial in vivo stable isotope fractionation: causes, correlations, consequences and applications. Isotopes Environ Health Stud 51, 155-199 doi: external page 10.1080/10256016.2015.1014355
Ghashghaie J., Badeck F.W., Girardin C., Sketriené D., Lamothe-Sibold M. and Werner R.A. (2015) Changes in d¹³C of dark respired CO₂ and organic matter of different organs during early ontogeny in peanut plants. Isotopes Environ Health Stud 51, 93-108 doi: external page 10.1080/10256016.2015.1011635
Werner R.A. and Roßmann A. (2015) Multi element (C, H, O) stable isotope analysis for the authentication of balsamic vinegars. Isotopes Environ Health Stud 51, 58-67 doi: external page 10.1080/10256016.2015.1011154
Werner R.A., Roßmann A., Gleixner G., Lehn C., Metges C.C. and Schnyder H. (2015) Editorial and Tribute. Special Issue dedicated to Professor Hanns-Ludwig Schmidt on the occasion of his 85^th birthday. Isotopes Environ Health Stud 51, 1-6 doi: external page 10.1080/10256016.2015.1016022
Blessing C.H., Werner R.A., Siegwolf R. and Buchmann N. (2015) Allocation dynamics of recently fixed carbon in beech saplings in response to increased temperatures and drought. Tree Physiol. 35, 585-598 doi: external page 10.1093/treephys/tpv024
Michna P., Werner R.A. and Eugster W. (2015) Does fog chemistry in Switzerland change with altitude? Atmos Res 151, 31-44 doi: external page 10.1016/j.atmosres.2014.02.008
Gessler A., Ferrio J.P., Hommel R., Treydte K., Werner R.A. and Monson R.K. (2014) Stable isotopes in tree rings: towards a mechanistic understanding of isotope fractionation and mixing processes from the leaves to the wood. Tree Physiol 34, 796-818 doi: external page 10.1093/treephys/tpu040
Zech M., Saurer M., Tuthorn M., Rinne K., Werner R.A., Siegwolf R.T.W. and Juchelka D. (2013) A novel methodological approach for d¹⁸O analysis of sugars using gas chromatography-pyrolysis-isotope ratio mass spectrometry. Isotopes Environ Health Stud 49, 492-502 doi: external page 10.1080/10256016.2013.824875
Michna P., Schenk J., Werner R.A. and Eugster W. (2013) MiniCASCC - A battery driven fog collector for ecosystem research. Atmos Res 128, 24-34 doi: external page 10.1016/j.atmosres.2013.02.009
Streit K., Rinne K.T., Hagedorn F., Dawes M.A., Saurer M., Hoch G., Werner R.A., Buchmann N. and Siegwolf R.T.W. (2013) Tracing fresh assimilates through Larix decidua exposed to elevated CO₂ and soil warming at the alpine treeline using compound-specific stable isotope analysis. New Phytol 197, 838-849 doi: external page 10.1111/nph.12074
Spiegel J.K., Aemisegger F., Scholl M., Wienhold F.G., Collett J.L. Jr., Lee T., van Pinxteren D., Mertes S., Tilgner A., Herrmann H., Werner R.A., Buchmann N. and Eugster W. (2012) Temporal evolution of stable water isotopologues in cloud droplets in a hill cap cloud in central Europe (HCCT-2010). Atmos Chem Phys 12, 11679-11694 doi: external page 10.5194/acp-12-11679-2012
Spiegel J.K., Aemisegger F., Scholl M., Wienhold F.G., Collett J.L. Jr., Lee T., van Pinxteren D., Mertes S., Tilgner A., Herrmann H., Werner R.A., Buchmann N. and Eugster W. (2012) Stable water isotopologue ratios in fog and cloud droplets of liquid clouds are not size-dependent. Atmos Chem Phys 12, 9855-9863 doi: external page 10.5194/acp-12-9855-2012
Zech M., Werner R.A., Juchelka D., Kalbitz K., Buggle B. and Glaser B. (2012) Absence of oxygen isotope fractionation/exchange of (hemi-) cellulose derived sugars during litter decomposition. Org Geochem 42, 1470-1475 doi: external page 10.1016/j.orggeochem.2011.06.006
Tanz N., Werner R.A., Eisenreich W. and Schmidt H.-L. (2011) Assessment of enzymatic methods in the d¹⁸O value determination of the L-tyrosine p-hydroxy group for proof of illegal meat and bone meal feeding to cattle. J Agric Food Chem 59, 9475-9483 doi: external page 10.1021/jf201217r
Lendenmann M., Thonar C., Barnard R.L., Salmon Y., Werner R.A., Frossard E. and Jansa J. (2011) Symbiont identity matters: Carbon and phosphorus fluxes between Medicago truncatula and different arbuscular mycorrhizal fungi. Mycorrhiza 21, 689-702 doi: external page 10.1007/s00572-011-0371-5
Werner R.A., Buchmann N., Siegwolf R.T.W., Kornexl B.E. and Gessler A. (2011) Metabolic fluxes, carbon isotope fractionation and respiration - lessons to be learned from plant biochemistry. New Phytol 191, 10-15 doi: external page 10.1111/j.1469-8137.2011.03741.x
Schumacher M., Werner R.A., Meijer H.A.J., Jansen H.G., Brand W.A., Geilmann H. and Neubert R.E.M. (2011) Oxygen isotopic signature of CO₂ from combustion processes. Atmos Chem Phys 11, 1473-1490 doi: external page 10.5194/acp-11-1473-2011
Waas S., Werner R.A. and Starck J.M. (2010) Fuel switching and energy partitioning during the postprandial metabolic response in the ball python (Python regius). J Exp Biol 213,1266-1271 doi: external page 10.1242/jeb.033662
Richter A., Wanek W., Werner R.A., Ghashghaie J., Jäggi M., Gessler A., Brugnoli E., Hettmann E., Göttlicher S.G., Salmon Y., Bathellier C., Kodama N., Nogues S., Søe A., Volders F., Sörgel K., Blöchl A., Siegwolf R., Buchmann N. and Gleixner G. (2009) Preparation of starch and soluble sugars of plant material for the analysis of carbon isotope composition: a comparison of methods. Rapid Commun Mass Spectrom 23, 2476-2488 doi: external page 10.1002/rcm.4088
Brand W.A., Coplen T.B., Aerts-Bijma A.T., Böhlke J.K., Gehre M., Geilmann H., Gröning M., Jansen H.G., Meijer H.A.J., Mroczkowski S.J., Qi H., Soergel K., Stuart-Williams H., Weise S.M. and Werner R.A. (2009) Comprehensive inter-laboratory calibration of reference materials for d¹⁸O versus VSMOW using various on-line high-temperature conversion techniques. Rapid Commun Mass Spectrom 23, 999-1019 doi: external page 10.1002/rcm.3958
Bassin S., Werner R.A., Sörgel K., Volk M., Buchmann N. and Fuhrer J. (2009) Effects of combined ozone and nitrogen deposition on the in situ properties of eleven key plant species of a subalpine pasture. Oecologia 158, 747-756 doi: external page 10.1007/s00442-008-1191-y
Kodama N., Barnard R.L., Salmon Y., Weston C., Ferrio J.P., Holst J., Werner R.A., Saurer M., Rennenberg H., Buchmann N. and Gessler A. (2008) Temporal dynamics of the carbon isotope composition in a Pinus sylvestris stand – from newly assimilated organic carbon to respired carbon dioxide. Oecologia 156, 737-750 doi: external page 10.1007/s00442-008-1030-1
Mohn J., Zeeman M.J., Werner R.A., Eugster W. and Emmenegger L. (2008) Continuous field measurements of δ¹³C-CO₂ and trace gases by FTIR spectroscopy. Isotopes Environ Health Stud 44, 241-251 doi: external page 10.1080/10256010802309731
Tuzson B., Mohn J., Zeeman M.J., Werner R.A., Eugster W., Zahniser M.S., Nelson D.D., McManus J.B. and Emmenegger L. (2008) High precision and continuous field measurements of δ¹³C and δ¹⁸O in carbon dioxide with a cryogenic-free QCLAS. Appl Phys B 92, 451-458 doi: external page 10.1007/s00340-008-3085-4
Zeeman M.J., Werner R.A., Eugster W., Siegwolf R.T.W., Wehrle G., Mohn J. and Buchmann N. (2008) Optimization of automated gas sample collection and IRMS analysis of d¹³C of CO₂ in air. Rapid Commun Mass Spectrom 22, 3883-3892 doi: external page 10.1002/rcm.3772
Mohn J., Werner R.A., Buchmann B. and Emmenegger L. (2007) High-precision δ¹³CO₂ analysis by FTIR spectroscopy using a novel calibration strategy. J Mol Struct 834, 95-101 doi: external page 10.1016/j.molstruc.2006.09.024
Schmidt H.-L., Werner R.A., Eisenreich W., Fuganti C., Fronza G., Remaud G. and Robins R.J. (2006) 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. Phytochem 67, 1094-1103 doi: external page 10.1016/j.phytochem.2006.03.014
Knohl A., Werner R.A., Brand W.A. and Buchmann N. (2005) Short-term variations in d¹³C of ecosystem respiration reveals link between assimilation and respiration in a deciduous forest. Oecologia 142, 70-82 doi: external page 10.1007/s00442-004-1702-4
Hobbie E.A. and Werner R.A. (2004) Intramolecular, compound-specific, and bulk carbon isotope patterns in C₃ and C₄ plants: a review and synthesis (Errata Vol. 161, p. 371-385, 2004). New Phytol 162, 240 doi: external page 10.1111/j.0028-646X.2004.01051.x
Hobbie E.A. and Werner R.A. (2004) Intramolecular, compound-specific, and bulk carbon isotope patterns in C₃ and C₄ plants: a review and synthesis. New Phytol 161, 371-385 doi: external page 10.1111/j.1469-8137.2004.00970.x
Starck J.M., Moser P., Werner R.A. and Linke P. (2004) Pythons metabolize prey to fuel the response to feeding. Proc Royal Soc London Ser B – Biol Sci 271, 903-908 doi: external page 10.1098/rspb.2004.2681
Knohl A., Werner R.A., Geilmann H. and Brand W.A. (2004) Kel-F™ discs improve storage time of canopy air samples in 10-mL vials for CO₂-d¹³C analysis. Rapid Commun Mass Spectrom 18, 1663-1665 doi: external page 10.1002/rcm.1528
Schmidt H.-L., Werner R.A., Yoshida N. and Well R. (2004) Is the isotopic composition of nitrous oxide an indicator for its origin from nitrification or denitrification? A theoretical approach from referred data and microbiological and enzyme kinetic aspects. Rapid Commun Mass Spectrom 18, 2036-2040 doi: external page 10.1002/rcm.1586
Werner R.A., Roßmann A., Schwarz C., Bacher A., Schmidt H.-L. and Eisenreich W. (2004) Biosynthesis of gallic acid in Rhus typhina: Discrimination between alternative pathways from natural oxygen isotope abundance. Phytochem 65, 2809-2813 doi: external page 10.1016/j.phytochem.2004.08.020
Gehre M., Geilmann H., Richter J., Werner R.A. and Brand W.A. (2004) Continuous flow ²H/¹H and ¹⁸O/¹⁶O analysis of water samples with dual inlet precision. Rapid Commun Mass Spectrom 18, 2650-2660 doi: external page 10.1002/rcm.1672
Bol R., Ostle N.J., Chenu C.C., Petzke K.-J., Werner R.A. and Balesdent J. (2004) Long term changes in the distribution and d¹⁵N values of individual soil amino acids in the absence of plant and fertilizer inputs. Isotopes Environ Health Stud 40, 243-256 doi: external page 10.1080/10256010412331305607
Schmidt H.-L., Werner R.A. and Eisenreich W. (2003) Systematics of ²H patterns in natural compounds and its importance for the elucidation of biosynthetic pathways. Phytochem Rev 2, 61-85 doi: external page 10.1023/B:PHYT.0000004185.92648.ae
Brooks P.D., Geilmann H., Werner R.A. and Brand W.A. (2003) Improved precision of coupled d¹³C and d¹⁵N measurements from single samples using an elemental analyser/isotope ratio mass spectrometer combination with a post-column 6-port valve and selective CO₂ trapping; improved halide robustness of the combustion reactor using CeO₂. Rapid Commun Mass Spectrom 17, 1924-1926 doi: external page 10.1002/rcm.1134
Werner R.A. (2003) The online ¹⁸O/¹⁶O analysis: Development and application. Isotopes Environ Health Stud 39, 85-104 doi: external page 10.1080/1025601031000108642
Dörr M., Käßbohrer J., Grunert R., Kreisel G., Brand W.A., Werner R.A., Geilmann H., Apfel C., Robl C. and Weigand W. (2003) A possible prebiotic formation of ammonia from dinitrogen on iron sulfide surfaces. Angew Chem Int Edit 42, 1540-1543 doi: external page 10.1002/anie.200250371
Dörr M., Käßbohrer J., Grunert R., Kreisel G., Brand W.A., Werner R.A., Geilmann H., Apfel C., Robl C. und Weigand W. (2003) Eine mögliche präbiotische Bildung von Ammoniak aus molekularem Stickstoff auf Eisensulfidoberflächen. Angew Chem 115, 1579-1581 doi: external page 10.1002/ange.200250371
Lloyd J., Langenfelds R.L., Francey R.J., Gloor M., Tchebakova N.M., Zolotoukhine D., Brand W.A., Werner R.A., Jordan A., Allison C.A., Zrazhewske V., Shibistova O. and Schulze E.-D. (2002) A trace-gas climatology above Zotino, central Siberia. Tellus B - Chem Phys Meteorol 54, 749-767 doi: external page 10.1034/j.1600-0889.2002.01335.x
Styles J.M., Raupach M.R., Farquhar G.D., Kolle O., Lawton K.A., Brand W.A., Werner R.A., Jordan A., Schulze E.-D., Shibistova O. and Lloyd J. (2002) Soil and canopy CO₂, ¹³CO₂, H₂O and sensible heat flux partitions in a forest canopy inferred from concentration measurements. Tellus B - Chem Phys Meteorol 54, 655-676 doi: external page 10.1034/j.1600-0889.2002.01356.x
Fronza G., Fuganti C., Schmidt H.-L. and Werner R.A. (2002) The d¹⁸O-value of the p-OH group of L-tyrosine permits the assignment of its origin to plant or animal sources. Eur Food Res Technol 215, 55-58 doi: external page 10.1007/s00217-002-0533-y
Czimczik C.I., Preston C.M., Schmidt M.W.I., Werner R.A. and Schulze E.-D. (2002) Effects of charring on mass, organic carbon, and stable carbon isotope composition of wood. Org Geochem 33, 1207-1223 doi: external page 10.1016/S0146-6380(02)00137-7
Werner R.A. and Schmidt H.-L. (2002) The in vivo isotope discrimination of nitrogen isotopes among organic plant compounds. Phytochem 61, 465-484 doi: external page 10.1016/S0031-9422(02)00204-2
Werner R.A., Rothe M. and Brand W.A. (2001) Extraction of CO₂ from air samples for isotopic analysis and limits to ultra high precision d¹⁸O determination in CO₂ gas. Rapid Commun Mass Spectrom 15, 2152-2167 doi: external page 10.1002/rcm.487
Schmidt H.-L., Werner R.A. and Roßmann A. (2001) ¹⁸O Pattern and biosynthesis of natural plant products. Phytochem 58, 9-32 doi: external page 10.1016/S0031-9422(01)00017-6
Werner R.A. and Brand W.A. (2001) Referencing strategies and techniques in stable isotope ratio analysis. Rapid Commun Mass Spectrom 15, 501-519 doi: external page 10.1002/rcm.258
Kornexl B.E., Gehre M., Höfling R. and Werner R.A. (1999) On-line d¹⁸O measurement of organic and inorganic substances. Rapid Commun Mass Spectrom 13, 1685-1693 doi: external page 10.1002/(SICI)1097-0231(19990830)13:16<1685::AID-RCM699>3.0.CO;2-9
Kornexl B.E., Werner R.A. and Gehre M. (1999) Standardization for oxygen isotope ratio measurement - still an unsolved problem. Rapid Commun Mass Spectrom 13, 1248-1251 doi: external page 10.1002/(SICI)1097-0231(19990715)13:13<1248::AID-RCM560>3.0.CO;2-H
Werner R.A., Bruch B.A. and Brand W.A. (1999) ConFlo III - an interface for high precision d¹³C and d¹⁵N analysis with an extended dynamic range. Rapid Commun Mass Spectrom 13, 1237-1241 doi: external page 10.1002/(SICI)1097-0231(19990715)13:13<1237::AID-RCM633>3.0.CO;2-C
Kornexl B.E., Werner R.A., Roßmann A. and Schmidt H.-L. (1997) A new method for the on-line measurement of d¹⁸O-values of organic substances. Isotopes Environ Health Stud 33, 262-263
Werner R.A., Kornexl B.E., Roßmann A. and Schmidt H.-L. (1996) On-line determination of d¹⁸O-values of organic substances. Anal Chim Acta 319, 159-164 doi: external page 10.1016/0003-2670(95)00468-8
Gleixner G., Danier H.-J., Werner R.A. and Schmidt H.-L. (1993) Correlations between the ¹³C content of primary and secondary plant products in different cell compartments and that in decomposing basidiomycetes. Plant Physiol 102, 1287-1290 doi: external page 10.1104/pp.102.4.1287

Books and Book Chapter

Pistocchi C., Bertrand I., Kantnerová K., Oberson A., Tamburini F., Werner R.A. (2023) The use of stable isotopes in soil science: Low atomic number elements. In: Encyclopedia of Soils in the Environment, 2nd edition, doi: external page 10.1016/B978-0-12-822974-3.00186-5
Schmidt H.-L., Werner R.A., Roßmann A., Mosandl A. and Schreier P. (2007)
Stable isotope ratio analysis in quality control of flavourings. In: H. Ziegler (ed): Flavourings. Production, Composition, Applications, Regulations. 2^nd, completely revised Edition. Wiley - VCH, Weinheim, Germany, pp. 602-663
Weigand W., Dörr M., Robl C., Kreisel G., Grunert R., Käßbohrer J., Brand W.A., Werner R.A., Popp J. and Tarcea N. (2002) Formation of ammonia from dinitrogen under primordial conditions. Proc. 2^nd Eur. Workshop on Exo-Astrobiology. Graz, Austria 16-19 Sept. 2002. European Space Agency 2002, pp. 209-212. ISBN 92-9092-828-X
Schmidt H.-L., Weber D., Rossmann A. and Werner R.A. (1999) The potential of intermolecular and intramolecular isotopic correlations for authenticity control. In: R. Teranishi, E.L. Wick, I. Hornstein (eds.): Flavor Chemistry. Thirty Years of Progress. Kluwer Academic / Plenum Publishers, New York, pp. 55-61
Schmidt H.-L., Roßmann A. and Werner R.A. (1998) Stable isotope ratio analysis in quality control of flavourings. In: E. Ziegler and H. Ziegler (Eds.): Flavourings. Wiley-VCH, Weinheim, pp. 539-594
Schmidt H.-L., Kexel H., Butzenlechner M., Schwarz S., Gleixner G., Thimet S., Werner R.A. and Gensler M. (1995) Non-statistical isotope distribution in natural compounds: Mirror of their biosynthesis and key for their origin assignment. In: E. Wada, T. Yoneyama, M. Minagawa, T. Ando and B.D. Fry (eds.): Stable Isotopes in the Biosphere. Kyoto University Press, Kyoto, Japan, pp. 17-35

Monographs

Werner R.A. (1998) Entwicklung neuer Verfahren für die on-line ¹⁸O/¹⁶O- und ²H/¹H-Isotopenverhältnismessung und ihre Anwendung zur Authentizitäts- und Herkunftsbestimmung bei Naturstoffen. Dissertation, Technische Universität München, Freising-Weihenstephan. Hieronymus Buchreproduktions GmbH, München. ISBN 3-93083-73-7
Werner R.A. (1996) Metabolismus von Triazin-Herbiziden in der Pedo- und Hydrosphäre. Studienarbeit im Rahmen des Aufbaustudiums Umweltschutztechnik. Technische Universität München
Werner R.A. (1992) Möglicher Einfluß der Kompartimentierung in Pflanzen auf Kohlenstoff-Isotopen-Verhältnisse bei Kohlenhydraten aus Assimilations- und Speicherorganen. Diplomarbeit. Technische Universität München, Freising-Weihenstephan