@article{UBHD-67797917,
  author={Anh{\"a}user, Tobias and Greule, Markus and Keppler, Frank},
  title={D/H ratios of methoxyl groups of the sedimentary organic matter of Lake Holzmaar (Eifel, Germany)},
  subtitle={a potential palaeoclimate/-hydrology proxy},
  year={2014},
  pages={39-52},
  language={eng},
  issn={0016-7037},
  volume={142},
  note={Gesehen am 01.04.2015},
  journal={Geochimica et cosmochimica acta},
  doi={10.1016/j.gca.2014.08.001},
}
@article{UBHD-68425206,
  author={Anh{\"a}user, Tobias and Greule, Markus and Keppler, Frank},
  title={Earliest Eocene cold period and polar amplification},
  subtitle={insights from [delta]2H values of lignin methoxyl groups of mummified wood},
  year={2018},
  pages={326-336},
  language={eng},
  issn={0031-0182},
  volume={505},
  note={Im Zusatz zum Titel ist "delta" als griechischer Buchstabe dargestellt ; Gesehen am 29.09.2019},
  journal={Palaeogeography, palaeoclimatology, palaeoecology},
  doi={10.1016/j.palaeo.2018.05.049},
}
@article{UBHD-68108047,
  author={Anh{\"a}user, Tobias and Greule, Markus and Polag, Daniela and Bowen, Gabriel J. and Keppler, Frank},
  title={Mean annual temperatures of mid-latitude regions derived from [delta]2H values of wood lignin methoxyl groups and its implications for paleoclimate studies},
  year={2017},
  pages={1276-1282},
  language={eng},
  issn={1879-1026},
  volume={574},
  note={Im Titel ist [delta] als griechischer Buchtstabe dargestellt und "2" hochgestellt ; Gesehen am 07.04.2017},
  journal={The science of the total environment},
  doi={10.1016/j.scitotenv.2016.07.189},
}
@article{UBHD-67848006,
  author={Anh{\"a}user, Tobias and Greule, Markus and Keppler, Frank},
  title={Stable hydrogen and carbon isotope ratios of methoxyl groups during plant litter degradation},
  year={2015},
  pages={143-154},
  language={eng},
  issn={1477-2639},
  volume={51},
  number={1},
  note={Gesehen am 20.07.2015},
  journal={Isotopes in environmental and health studies},
  doi={10.1080/10256016.2015.1013540},
}
@article{UBHD-68108046,
  author={Anh{\"a}user, Tobias and Greule, Markus and Keppler, Frank},
  title={Stable hydrogen isotope values of lignin methoxyl groups of four tree species across Germany and their implication for temperature reconstruction},
  year={2017},
  pages={263-271},
  language={eng},
  issn={1879-1026},
  volume={579},
  note={Gesehen am 07.04.2017},
  journal={The science of the total environment},
  doi={10.1016/j.scitotenv.2016.11.109},
}
@article{UBHD-68576861,
  author={Anh{\"a}user, Tobias and Sehls, Birgit and Thomas, Werner and Hartl, Claudia and Greule, Markus and Scholz, Denis and Esper, Jan and Keppler, Frank},
  title={Tree-ring [delte]2H values from lignin methoxyl groups indicate sensitivity to European-scale temperature changes},
  year={2020},
  language={eng},
  issn={0031-0182},
  volume={546(2020) Artikel-Nummer 109665},
  number={14 Seiten},
  note={Im Titel ist die Zahl "2" hochgestellt ; Im Titel ist delta als griechischer Buchstabe dargestellt ; Gesehen am 14.05.2020},
  journal={Palaeogeography, palaeoclimatology, palaeoecology},
  doi={10.1016/j.palaeo.2020.109665},
}
@article{UBHD-68414467,
  author={Bahlmann, Enno and Keppler, Frank and Greule, Markus and Sch{\"o}ler, Heinz Friedrich},
  title={Evidence for a major missing source in the global chloromethane budget from stable carbon isotopes},
  year={2019},
  pages={1703-1719},
  language={eng},
  issn={1680-7324},
  volume={19},
  number={3},
  note={Gesehen am 31.07.2019},
  journal={Atmospheric chemistry and physics},
  doi={10.5194/acp-19-1703-2019},
}
@article{UBHD-69233798,
  author={Cox, Terry and Laceby, J. Patrick and Greule, Markus and Keppler, Frank and Alewell, Christine},
  title={Using stable carbon isotopes of lignin-derived methoxy to improve historical apportionments of particulate organic matter and sediment sources incorporating multiple Suess corrections},
  year={2024},
  pages={2159-2179},
  language={eng},
  issn={1614-7480},
  volume={24},
  number={5},
  note={Gesehen am 15.07.2024},
  journal={Journal of soils and sediments},
  doi={10.1007/s11368-024-03765-2},
}
@article{UBHD-69322788,
  author={Cox, Terry and Wieland, Anna and Greule, Markus and Keppler, Frank and Einbock, Annika and Alewell, Christine},
  title={Isotopic analysis (δ13C and δ2H) of lignin methoxy groups in forest soils to identify and quantify lignin sources},
  year={2024},
  pages={1-10},
  language={eng},
  issn={1879-1026},
  volume={949(2024) vom: Nov.},
  number={Artikel-ID 175025},
  note={Im Titel sind die Zahlen 13 und 2 hochgestellt ; Online verf{\"u}gbar: 24. Juli 2024, Artikelversion:  29. Juli 2024 ; Gesehen am 27.03.2025},
  journal={The science of the total environment},
  doi={10.1016/j.scitotenv.2024.175025},
}
@article{UBHD-68982488,
  author={Einzmann, Teresa and Schroll, Moritz and Kleint, Jan F. and Greule, Markus and Keppler, Frank},
  title={Application of concentration and 2-dimensional stable isotope measurements of methane to constrain sources and sinks in a seasonally stratified freshwater lake},
  year={2022},
  pages={1-22},
  language={eng},
  issn={2296-665X},
  volume={10},
  number={Artikel-ID 865862},
  note={Gesehen am 07.11.2022},
  journal={Frontiers in Environmental Science},
  doi={10.3389/fenvs.2022.865862},
  url={https://www.frontiersin.org/articles/10.3389/fenvs.2022.865862},
  library={UB},
}
@book{UBHD-68982480,
  author={Einzmann, Teresa and Schroll, Moritz and Kleint, Jan F. and Greule, Markus and Keppler, Frank},
  title={Application of concentration and 2-dimensional stable isotope measurements of methane to constrain sources and sinks in a seasonally stratified freshwater lake [data]},
  publisher={Universit{\"a}t},
  address={Heidelberg},
  year={2022},
  pages={1 Online-Ressource (1 File)},
  language={ger},
  note={Gesehen am 07.11.2022},
  doi={10.11588/data/KLFDVF},
  url={https://doi.org/10.11588/data/KLFDVF},
  library={UB},
}
@article{UBHD-68222311,
  author={Geißler, Katrin and Greule, Markus and Keppler, Frank},
  title={Vanilla authenticity control by DNA barcoding and isotope data aggregation},
  year={2017},
  pages={228-237},
  language={eng},
  issn={1099-1026},
  volume={32},
  number={4},
  note={Gesehen am 20.02.2018},
  journal={Flavour and fragrance journal},
  doi={10.1002/ffj.3379},
}
@article{UBHD-67796495,
  author={Gori, Yuri and Greule, Markus and Keppler, Frank},
  title={Carbon, hydrogen and oxygen stable isotope ratios of whole wood, cellulose and lignin methoxyl groups of Picea abies as climate proxies},
  year={2013},
  pages={265-275},
  language={eng},
  issn={1097-0231},
  volume={27},
  number={1},
  note={Gesehen am 30.03.2015},
  journal={Rapid communications in mass spectrometry},
  doi={10.1002/rcm.6446},
}
@article{UBHD-67848666,
  author={Greule, Markus and Keppler, Frank},
  title={Comment on authenticity and traceability of vanilla flavors by analysis of stable isotopes of carbon and hydrogen},
  year={2015},
  pages={5305-5306},
  language={eng},
  issn={1520-5118},
  volume={63},
  number={21},
  note={Gesehen am 21.07.2015},
  journal={Journal of agricultural and food chemistry},
  doi={10.1021/jf506172q},
}
@article{UBHD-69192064,
  author={Greule, Markus and Le, Phuong Mai and Meija, Juris and Mester, Zoltán and Keppler, Frank},
  title={Comparison of carbon isotope ratio measurement of the vanillin methoxy group by gc-irms and 13c-qnmr},
  year={2024},
  pages={100-105},
  language={eng},
  issn={1879-1123},
  volume={35},
  number={3},
  note={Im Titel ist 13 hochgestellt ; Published online 28 November 2023, published in issue 3 January 2024 ; Gesehen am 14.03.2024},
  journal={Journal of the American Society for Mass Spectrometry},
  doi={10.1021/jasms.3c00327},
}
@article{UBHD-67837020,
  author={Greule, Markus and Keppler, Frank},
  title={Improved rapid authentication of vanillin using [delta]13C and [delta]2H values},
  year={2010},
  pages={933-941},
  language={eng},
  issn={1438-2385},
  volume={231},
  number={6},
  note={Im Titel sind die Zahlen "13" und "2" hochgestellt ; Im Titel ist delta als griechischer Buchstabe dargestellt ; Gesehen am 29.06.2015},
  journal={European food research and technology},
  doi={10.1007/s00217-010-1346-z},
}
@article{UBHD-68783263,
  author={Greule, Markus and Wieland, Anna and Keppler, Frank},
  title={Measurements and applications of δ2H values of wood lignin methoxy groups for paleoclimatic studies},
  year={2021},
  pages={1-9},
  language={eng},
  issn={0277-3791},
  volume={268(2021) vom: Aug.},
  number={Artikel-ID 107107},
  note={Im Titel ist delta als griechischer Buchstabe dargestellt ; Gesehen am 24.09.2021},
  journal={Quaternary science reviews},
  doi={10.1016/j.quascirev.2021.107107},
}
@article{UBHD-68359307,
  author={Greule, Markus and Keppler, Frank},
  title={Methyl sulfates as methoxy isotopic reference materials for [delta]13C and [delta]2H measurements},
  year={2019},
  pages={343-350},
  language={eng},
  issn={1097-0231},
  volume={33},
  number={4},
  note={First published: 19 November 2018 ; Im Titel sind die Zahlen"13" und "2" hochgestellt ; Im Titel ist delta als griechischer Buchstabe dargestellt ; Gesehen am 15.02.2019},
  journal={Rapid communications in mass spectrometry},
  doi={10.1002/rcm.8355},
}
@article{UBHD-67840359,
  author={Greule, Markus and Keppler, Frank},
  title={A rapid and precise method for determination of D/H ratios of plant methoxyl groups},
  year={2008},
  pages={3983-3988},
  language={eng},
  issn={1097-0231},
  volume={22},
  number={24},
  note={Gesehen am 02.07.2015},
  journal={Rapid communications in mass spectrometry},
  doi={10.1002/rcm.3817},
}
@article{UBHD-67838257,
  author={Greule, Markus and Keppler, Frank},
  title={A simple rapid method to precisely determine 13C/12C ratios of plant methoxyl groups},
  year={2009},
  pages={1710-1714},
  language={eng},
  issn={1097-0231},
  volume={23},
  number={11},
  note={Im Titel sind die Zahlen "13" und "12" hochgestellt ; Gesehen am 01.07.2015},
  journal={Rapid communications in mass spectrometry},
  doi={10.1002/rcm.4057},
}
@article{UBHD-67794586,
  author={Greule, Markus and Huber, Stefan and Keppler, Frank},
  title={Stable hydrogen-isotope analysis of methyl chloride emitted from heated halophytic plants},
  year={2012},
  pages={584-592},
  language={eng},
  issn={1878-2442 and 1873-2844},
  volume={62},
  note={Gesehen am 25.03.2015},
  journal={Atmospheric environment},
}
@article{UBHD-67793917,
  author={Greule, Markus and Keppler, Frank},
  title={Stable isotope determination of ester and ether methyl moieties in plant methoxyl groups},
  year={2011},
  pages={470-482},
  language={eng},
  issn={1477-2639},
  volume={47},
  number={4},
  note={Gesehen am 24.03.2015},
  journal={Isotopes in environmental and health studies},
  doi={10.1080/10256016.2011.616270},
}
@article{UBHD-67802004,
  author={Greule, Markus and Keppler, Frank},
  title={A stable isotope approach to assessing water loss in fruits and vegetables during storage},
  year={2015},
  pages={1974-1981},
  language={eng},
  issn={1520-5118},
  volume={63},
  number={7},
  note={Gesehen am 13.04.2015},
  journal={Journal of agricultural and food chemistry},
  doi={10.1021/jf505192p},
}
@article{UBHD-68559257,
  author={Greule, Markus and Moossen, Heiko and Lloyd, Max K. and Geilmann, Heike and Brand, Willi A. and Eiler, John M. and Qi, Haiping and Keppler, Frank},
  title={Three wood isotopic reference materials for [delta]2H and [delta]13C measurements of plant methoxy groups},
  year={2020},
  pages={1-11},
  language={eng},
  issn={1872-6836},
  volume={533(2020) Artikel-Nummer 119428},
  note={Available online 25 November 2019 ; Im Titel sind die Zahlen "2" und "13" im Titel hochgestellt ; Im Titel ist delta als griechischer Buchstabe dargestellt ; Gesehen am 30.03.2020},
  journal={Chemical geology},
  doi={10.1016/j.chemgeo.2019.119428},
}
@article{UBHD-69098861,
  author={Hartmann, Simon Christoph and Keppler, Frank and Greule, Markus and Lauer, Rebekka and Horst, Axel},
  title={Triple-element stable isotope analysis of chloromethane emitted by royal fern and degraded by club moss},
  year={2023},
  pages={1-15},
  language={eng},
  issn={2169-8961},
  volume={128},
  note={Online ver{\"o}ffentlicht: 8 Mai 2023 ; Gesehen am 18.07.2023},
  journal={Journal of geophysical research},
  doi={10.1029/2022JG007256},
}
@article{UBHD-68222314,
  author={Hepp, Johannes and Greule, Markus and Keppler, Frank},
  title={Late Quaternary relative humidity changes from Mt. Kilimanjaro, based on a coupled 2H-18O biomarker paleohygrometer approach},
  year={2017},
  pages={116-130},
  language={eng},
  issn={1040-6182},
  volume={438},
  note={Gesehen am 20.02.2018 ; Im Titel sind die Zahlen 2 und 18 hochgestellt},
  journal={Quaternary international},
  doi={10.1016/j.quaint.2017.03.059},
}
@article{UBHD-68640369,
  author={Hou, Alicia and Bahr, André and Greule, Markus and Friedrich, Oliver},
  title={Insolation and greenhouse gas forcing of the South American monsoon system across three glacial‐interglacial cycles},
  year={2020},
  pages={1-10},
  language={eng},
  issn={1944-8007},
  volume={47},
  note={Gesehen am 25.09.2020},
  journal={Geophysical research letters},
  doi={10.1029/2020GL087948},
  url={https://doi.org/10.1029/2020GL087948},
  library={UB},
}
@article{UBHD-68425929,
  author={J{\"a}ger, Nicole and R{\"o}hling, Amelie Ninja and Koch, Fabien and Greule, Markus and Keppler, Frank},
  title={Chloromethane formation and degradation in the fern phyllosphere},
  year={2018},
  pages={1278-1287},
  language={eng},
  issn={1879-1026},
  volume={634},
  note={Gesehen am 02.09.2019},
  journal={The science of the total environment},
  doi={10.1016/j.scitotenv.2018.03.316},
}
@article{UBHD-68427110,
  author={J{\"a}ger, Nicole and Greule, Markus and Keppler, Frank},
  title={Chloromethane degradation in soils},
  subtitle={a combined microbial and two-dimensional stable isotope approach},
  year={2018},
  pages={254-262},
  language={eng},
  issn={1537-2537},
  volume={47},
  number={2},
  note={Gesehen am 05.09.2019},
  journal={Journal of environmental quality},
  doi={10.2134/jeq2017.09.0358},
}
@article{UBHD-68560244,
  author={Keppler, Frank and Barnes, Jaime D. and Horst, Axel and Bahlmann, Enno and Luo, Jing and Nadalig, Thierry and Greule, Markus and Hartmann, Simon Christoph and Vuilleumier, Stéphane},
  title={Chlorine isotope fractionation of the major chloromethane degradation processes in the environment},
  year={2020},
  pages={1634-1645},
  language={eng},
  issn={2328-8930},
  volume={54},
  number={3},
  note={Gesehen am 01.04.2020},
  journal={Environmental science & technology letters},
  doi={10.1021/acs.est.9b06139},
}
@article{UBHD-67704549,
  author={Keppler, Frank and Greule, Markus and Sattler, Tobias and Sch{\"o}ler, Heinz Friedrich},
  title={Chloromethane release from carbonaceous meteorite affords new insight into Mars lander findings},
  year={2014},
  pages={11 S.},
  language={eng},
  issn={2045-2322},
  volume={4(2014) Artikel-Nr. 7010},
  note={Gesehen am 14.11.2014},
  journal={Scientific reports},
  doi={10.1038/srep07010},
}
@article{UBHD-68220618,
  author={Keppler, Frank and Fischer, Jan and Sattler, Tobias and Polag, Daniela and J{\"a}ger, Nicole and Sch{\"o}ler, Heinz Friedrich and Greule, Markus},
  title={Chloromethane emissions in human breath},
  year={2017},
  pages={405-410},
  language={eng},
  issn={1879-1026},
  volume={605/606},
  note={Gesehen am 15.02.2018},
  journal={The science of the total environment},
  doi={10.1016/j.scitotenv.2017.06.202},
}
@article{UBHD-68427095,
  author={Keppler, Frank and Greule, Markus and Sch{\"o}ler, Heinz Friedrich},
  title={Mass spectrometric measurement of hydrogen isotope fractionation for the reactions of chloromethane with OH and Cl},
  year={2018},
  pages={6625-6635},
  language={eng},
  issn={1680-7324},
  volume={18},
  number={9},
  note={Gesehen am 05.09.2019},
  journal={Atmospheric chemistry and physics},
  doi={10.5194/acp-18-6625-2018},
}
@article{UBHD-67837636,
  author={Keppler, Frank and Greule, Markus},
  title={Measurements of 13C/12C methane from anaerobic digesters},
  subtitle={comparison of optical spectrometry with continuous-flow isotope ratio mass spectrometry},
  year={2010},
  pages={5067-5073},
  language={eng},
  issn={1520-5851},
  volume={44},
  number={13},
  note={Im Titel sind die Zahlen "13" und "12" hochgestellt ; Gesehen am 30.06.2015},
  journal={Environmental science & technology},
  doi={10.1021/es100460d},
}
@article{UBHD-68575805,
  author={Keppler, Frank and R{\"o}hling, Amelie Ninja and J{\"a}ger, Nicole and Schroll, Moritz and Hartmann, Simon Christoph and Greule, Markus},
  title={Sources and sinks of chloromethane in a salt marsh ecosystem},
  subtitle={constraints from concentration and stable isotope measurements of laboratory incubation experiments},
  year={2020},
  pages={627-641},
  language={eng},
  issn={2050-7895},
  volume={22},
  number={3},
  note={Gesehen am 12.05.2020},
  journal={Environmental science},
  doi={10.1039/C9EM00540D},
}
@article{UBHD-67932873,
  author={Keppler, Frank and Schiller, Amanda and Greule, Markus and Kleint, Jan F. and Polag, Daniela},
  title={Stable isotope and high precision concentration measurements confirm that all humans produce and exhale methane},
  year={2016},
  pages={? S.},
  language={eng},
  issn={1752-7163},
  volume={10(2016},
  number={1) Artikel-Nummer 016003},
  note={Gesehen am 01.02.2016},
  journal={Journal of breath research},
  doi={10.1088/1752-7155/10/1/016003},
}
@article{UBHD-68427091,
  author={Kleint, Jan F. and Schiller, Amanda and Greule, Markus and Keppler, Frank and Isenbeck-Schr{\"o}ter, Margot},
  title={A fast and sensitive method for the continuous in situ determination of dissolved methane and its [delta]13C-isotope ratio in surface waters},
  year={2018},
  pages={273-285},
  language={eng},
  issn={1541-5856},
  volume={16},
  number={5},
  note={Im Titel ist "delta" als griechischer Buchstabe dargestellt ; im Titel ist die Zahl "13" hochgestellt ; Gesehen am 05.09.2019},
  journal={Limnology and oceanography},
  doi={10.1002/lom3.10244},
}
@book{UBHD-69084412,
  author={Klintzsch, Thomas and Geisinger, Hannah Katharina and Wieland, Anna and Langer, Gerald and Nehrke, Gernot and Bižić, Mina and Greule, Markus and Lenhart, Katharina and Borsch, Christian and Schroll, Moritz and Keppler, Frank},
  title={Stable carbon isotope signature of methane released from phytoplankton [research data]},
  publisher={Universit{\"a}t},
  address={Heidelberg},
  year={2023},
  pages={1 Online-Ressource (1 File)},
  language={eng},
  note={Gesehen am 12.06.2023},
  doi={10.11588/data/YYLEKU},
  url={https://doi.org/10.11588/data/YYLEKU},
  library={UB},
}
@article{UBHD-69109451,
  author={Klintzsch, Thomas and Geisinger, Hannah Katharina and Wieland, Anna and Langer, G. and Nehrke, G. and Bizic, M. and Greule, Markus and Lenhart, Katharina and Borsch, C. and Schroll, Moritz and Keppler, Frank},
  title={Stable carbon isotope signature of methane released from phytoplankton},
  year={2023},
  pages={1-12},
  language={eng},
  issn={1944-8007},
  volume={50},
  note={Ver{\"o}ffentlicht: 20. Juni 2023 ; Gesehen am 10.08.2023},
  journal={Geophysical research letters},
  doi={10.1029/2023GL103317},
}
@article{UBHD-67837019,
  author={Laukenmann, Stephan and Polag, Daniela and Greule, Markus and Keppler, Frank},
  title={Identification of methanogenic pathways in anaerobic digesters using stable carbon isotopes},
  year={2010},
  pages={509-514},
  language={eng},
  issn={1618-2863},
  volume={10},
  number={6},
  note={Gesehen am 29.06.2015},
  journal={Engineering in life sciences},
  doi={10.1002/elsc.201000074},
}
@article{UBHD-67793922,
  author={Lenhart, Katharina and Greule, Markus and Keppler, Frank},
  title={Evidence for methane production by saprotrophic fungi},
  year={2012},
  pages={9 S.},
  language={eng},
  issn={2041-1723},
  volume={3(2012) Article number 1046},
  number={8 Seiten},
  note={Gesehen am 24.03.2015},
  journal={Nature Communications},
  doi={10.1038/ncomms2049},
}
@article{UBHD-67848660,
  author={Lenhart, Katharina and Greule, Markus and Keppler, Frank},
  title={Technical note: Methionine, a precursor of methane in living plants},
  year={2015},
  pages={1907-1914},
  language={eng},
  issn={1726-4189},
  volume={12},
  number={6},
  note={Gesehen am 21.07.2015},
  journal={Biogeosciences},
  doi={10.5194/bg-12-1907-2015},
}
@article{UBHD-69144893,
  author={Lu, Qiangqiang and Liu, Xiaohong and Treydte, Kerstin and Greule, Markus and Wieland, Anna and Liu, Jinzhao and Zhao, Liangju and Zhang, Yu and Kang, Huhu and Zhang, Lingnan and Zeng, Xiaomin and Keppler, Frank and Chen, Zhikun and Xing, Xiaoyu},
  title={Altitude-specific differences in tree-ring δ2H records of wood lignin methoxy in the Qinling mountains, central China},
  year={2023},
  pages={1-14},
  language={eng},
  issn={0277-3791},
  volume={300},
  number={Artikel-ID 107895},
  note={Gesehen am 21.11.2023},
  journal={Quaternary science reviews},
  doi={10.1016/j.quascirev.2022.107895},
}
@article{UBHD-68427100,
  author={May, Tobias and Polag, Daniela and Keppler, Frank and Greule, Markus},
  title={Methane oxidation in industrial biogas plants},
  subtitle={insights in a novel methanotrophic environment evidenced by pmoA gene analyses and stable isotope labelling studies},
  year={2018},
  pages={77-84},
  language={eng},
  issn={1873-4863},
  volume={270},
  note={Gesehen am 05.09.2019},
  journal={Journal of biotechnology},
  doi={10.1016/j.jbiotec.2018.01.022},
}
@article{UBHD-67976046,
  author={Mischel, Maria and Esper, Jan and Keppler, Frank and Greule, Markus},
  title={[Delta]2H, [delta]13C and [delta]18O from whole wood, α-cellulose and lignin methoxyl groups in Pinus sylvestris},
  subtitle={a multi-parameter approach},
  year={2015},
  pages={553-568},
  language={eng},
  issn={1477-2639},
  volume={51},
  number={4},
  note={Gesehen am 09.05.2016 ; Im Titel sind alpha und delta als griechische Buchstaben dargestellt ; Im Titel sind die Zahlen "2", "13" und "18" hochgestellt},
  journal={Isotopes in environmental and health studies},
  doi={10.1080/10256016.2015.1056181},
}
@article{UBHD-68221841,
  author={Mulat, Daniel Girma and Polag, Daniela and Greule, Markus and Keppler, Frank},
  title={Exogenous addition of H2 for an in situ biogas upgrading through biological reduction of carbon dioxide into methane},
  year={2017},
  pages={146-156},
  language={eng},
  issn={1879-2456},
  volume={68},
  note={Im Titel ist die Zahl "2" tiefgestellt ; Gesehen am 19.02.2018},
  journal={Waste management},
  doi={10.1016/j.wasman.2017.05.054},
}
@article{UBHD-67796518,
  author={Nadalig, Thierry and Greule, Markus and Keppler, Frank},
  title={Hydrogen and carbon isotope fractionation during degradation of chloromethane by methylotrophic bacteria},
  year={2013},
  pages={893-900},
  language={eng},
  issn={2045-8827},
  volume={2},
  number={6},
  note={Gesehen am 30.03.2015},
  journal={MicrobiologyOpen},
  doi={10.1002/mbo3.124},
}
@article{UBHD-67797919,
  author={Nadalig, Thierry and Greule, Markus and Keppler, Frank},
  title={Probing the diversity of chloromethane-degrading bacteria by comparative genomics and isotopic fractionation},
  year={2014},
  pages={11 S.},
  language={eng},
  issn={1664-302X},
  volume={5(2014) Art.-Nr. 523},
  number={11 S.},
  note={Gesehen am 01.04.2015},
  journal={Frontiers in microbiology},
  doi={10.3389/fmicb.2014.00523},
}
@article{UBHD-67796503,
  author={Polag, Daniela and Greule, Markus and Keppler, Frank},
  title={Evidence of anaerobic syntrophic acetate oxidation in biogas batch reactors by analysis of 13C carbon isotopes},
  year={2013},
  pages={365-377},
  language={eng},
  issn={1477-2639},
  volume={49},
  number={3},
  note={Im Titel ist die Zahl "13" hochgestellt ; Gesehen am 30.03.2015},
  journal={Isotopes in environmental and health studies},
  doi={10.1080/10256016.2013.805758},
}
@article{UBHD-68007068,
  author={Riechelmann, Dana and Greule, Markus and Keppler, Frank},
  title={Climate signals in [delta]13C of wood lignin methoxyl groups from high-elevation larch trees},
  year={2016},
  pages={60-71},
  language={eng},
  issn={0031-0182},
  volume={445},
  note={Gesehen am 13.07.2016 ; Im Titel ist delta als griechischer Buchstabe dargestellt ; Im Titel ist die Zahl "13 " hochgestellt},
  journal={Palaeogeography, palaeoclimatology, palaeoecology},
  doi={10.1016/j.palaeo.2016.01.001},
}
@article{UBHD-68221842,
  author={Riechelmann, Dana and Greule, Markus and Anh{\"a}user, Tobias and Keppler, Frank},
  title={Warm season precipitation signal in [delta]2H values of wood lignin methoxyl groups from high elevation larch trees in Switzerland},
  year={2017},
  pages={1589-1598},
  language={eng},
  issn={1097-0231},
  volume={31},
  number={19},
  note={Gesehen am 19.02.2018 ; Im Titel ist delta als griechischer Buchstabe dargestellt ; Im Titel ist 2 als Hochzahl dargestellt},
  journal={Rapid communications in mass spectrometry},
  doi={10.1002/rcm.7938},
}
@article{UBHD-67837630,
  author={R{\"o}ckmann, Thomas and Keppler, Frank and Greule, Markus},
  title={Isotopic composition of H2 from wood burning},
  subtitle={dependency on combustion efficiency, moisture content, and [delta]D of local precipitation},
  year={2010},
  pages={11 S.},
  language={eng},
  issn={2169-8996},
  volume={115(2010},
  note={Im Titel ist die Zahl "2" tiefgestellt ; Im Zusatz zum Titel ist delta als griechisches Zeichen dargestellt ; Gesehen am 30.06.2015},
  journal={Journal of geophysical research},
  doi={10.1029/2009JD013188},
}
@article{UBHD-68220646,
  author={Schreiber, Ulrich C. and Greule, Markus and Keppler, Frank and Mulder, Ines and Sattler, Tobias and Sch{\"o}ler, Heinz Friedrich},
  title={Organic compounds in fluid inclusions of Archean quartz},
  subtitle={analogues of prebiotic chemistry on early earth},
  year={2017},
  pages={9 S.},
  language={eng},
  issn={1932-6203},
  volume={12(2017},
  note={Gesehen am 15.02.2018},
  journal={PLOS ONE},
  doi={10.1371/journal.pone.0177570},
}
@book{UBHD-68593646,
  author={Schroll, Moritz and Keppler, Frank and Greule, Markus and Eckhardt, Christian and Zorn, Holger and Lenhart, Katharina},
  title={The stable carbon isotope signature of methane produced by saprotrophic fungi [dataset]},
  publisher={Universit{\"a}t},
  address={Heidelberg},
  year={2020},
  pages={1 Online-Ressource (1 File)},
  language={eng},
  note={Gesehen am 29.06.2020},
  doi={10.11588/data/DQYPMC},
  url={https://doi.org/10.11588/data/DQYPMC},
  library={UB},
}
@article{UBHD-68593649,
  author={Schroll, Moritz and Keppler, Frank and Greule, Markus and Eckhardt, Christian and Zorn, Holger and Lenhart, Katharina},
  title={The stable carbon isotope signature of methane produced by saprotrophic fungi},
  year={2020},
  pages={21 S.},
  language={eng},
  issn={1810-6285},
  volume={(2020) Preprint},
  note={Gesehen am 29.06.2020},
  journal={Biogeosciences discussions},
  doi={10.5194/bg-2020-108},
}
@article{UBHD-68639727,
  author={Schroll, Moritz and Keppler, Frank and Greule, Markus and Eckhardt, Christian and Zorn, Holger and Lenhart, Katharina},
  title={The stable carbon isotope signature of methane produced by saprotrophic fungi},
  year={2020},
  pages={3891-3901},
  language={eng},
  issn={1726-4189},
  volume={17},
  number={14},
  note={Gesehen am 23.09.2020},
  journal={Biogeosciences},
  doi={10.5194/bg-17-3891-2020},
}
@article{UBHD-67838263,
  author={Vigano, Ivan and Keppler, Frank and Greule, Markus},
  title={The stable isotope signature of methane emitted from plant material under UV irradiation},
  year={2009},
  pages={5637-5646},
  language={eng},
  issn={1878-2442 and 1873-2844},
  volume={43},
  number={35},
  note={Gesehen am 01.07.2015},
  journal={Atmospheric environment},
  doi={10.1016/j.atmosenv.2009.07.046},
}
@article{UBHD-67837650,
  author={Vigano, Ivan and Keppler, Frank and Greule, Markus},
  title={Water drives the deuterium content of the methane emitted from plants},
  year={2010},
  pages={3865-3873},
  language={eng},
  issn={0016-7037},
  volume={74},
  number={14},
  note={Gesehen am 30.06.2015},
  journal={Geochimica et cosmochimica acta},
  doi={10.1016/j.gca.2010.03.030},
}
@article{UBHD-67793089,
  author={Wang, Zhiping and Keppler, Frank and Greule, Markus},
  title={Non-microbial methane emissions from fresh leaves},
  subtitle={effects of physical wounding and anoxia},
  year={2011},
  pages={4915-4921},
  language={eng},
  issn={1878-2442 and 1873-2844},
  volume={45},
  number={28},
  note={Gesehen am 23.03.2015},
  journal={Atmospheric environment},
  doi={10.1016/j.atmosenv.2011.06.001},
}
@article{UBHD-68979313,
  author={Wieland, Anna and Greule, Markus and Roemer, Philipp and Esper, Jan and Keppler, Frank},
  title={Climate signals in stable carbon and hydrogen isotopes of lignin methoxy groups from southern German beech trees},
  year={2022},
  pages={1849-1866},
  language={eng},
  issn={1814-9332},
  volume={18},
  number={8 vom: Aug.},
  note={Gesehen am 27.10.2022},
  journal={Climate of the past},
  doi={10.5194/cp-18-1849-2022},
  url={https://doi.org/10.5194/cp-18-1849-2022},
  library={UB},
}
@article{UBHD-68979300,
  author={Wieland, Anna and Greule, Markus and Roemer, Philipp and Esper, Jan and Keppler, Frank},
  title={Climate signals in stable carbon and hydrogen isotopes of lignin methoxy groups from southern German beech trees},
  year={2021},
  pages={1-26},
  language={eng},
  issn={1814-9359},
  note={Gesehen am 27.10.2022},
  journal={Climate of the past discussions},
  doi={10.5194/cp-2021-135},
}
@book{UBHD-68979293,
  author={Wieland, Anna and Greule, Markus and Roemer, Philipp and Esper, Jan and Keppler, Frank},
  title={Climate signals in stable carbon and hydrogen isotopes of lignin methoxy groups from southern German beech trees [data]},
  publisher={Universit{\"a}t},
  address={Heidelberg},
  year={2022},
  pages={1 Online-Ressource (1 File)},
  language={ger},
  note={Gesehen am 27.10.2022},
  doi={10.11588/data/ZCMVUY},
  url={https://doi.org/10.11588/data/ZCMVUY},
  library={UB},
}
@article{UBHD-69277284,
  author={Wieland, Anna and R{\"o}mer, Philipp and Torbenson, Max and Greule, Markus and Urban, Otmar and Čáslavský, Josef and Pernicová, Natálie and Trnka, Miroslav and B{\"u}ntgen, Ulf and Esper, Jan and Keppler, Frank},
  title={Tree-ring stable isotopes in cellulose and lignin methoxy groups reveal different age-related behaviour},
  year={2024},
  pages={38-48},
  language={eng},
  issn={1040-6182},
  volume={693(2024) vom: Mai},
  note={Online verf{\"u}gbar: 19. Februar 2024, Artikelversion: 22. Mai 2024 ; Gesehen am 27.11.2024},
  journal={Quaternary international},
  doi={10.1016/j.quaint.2024.02.004},
}
@article{UBHD-68423115,
  author={Wilde, Amelie S. and Frandsen, Henrik Lauritz and Greule, Markus},
  title={Isotopic characterization of vanillin ex glucose by GC-IRMS},
  subtitle={New challenge for natural vanilla flavour authentication?},
  year={2019},
  pages={7 S.},
  language={eng},
  issn={0956-7135},
  volume={106(2019) Artikel-Nummer 106735},
  number={7 Seiten},
  note={Gesehen am 22.08.2019},
  journal={Food control},
  doi={10.1016/j.foodcont.2019.106735},
}
@article{UBHD-67796498,
  author={W{\"u}rfel, Oliver and Greule, Markus and Keppler, Frank},
  title={Position-specific isotope analysis of the methyl group carbon in methylcobalamin for the investigation of biomethylation processes},
  year={2013},
  pages={2833-2841},
  language={eng},
  issn={1618-2650},
  volume={405},
  number={9},
  journal={Analytical and bioanalytical chemistry},
  doi={10.1007/s00216-012-6635-x},
}