Tentative Programme: Sessions

Please click on a session to learn more. For all sessions: We don't go only for traditional elements!

1. Methodological AdvancesConveners:• Harro Meijer (University of Groningen, Netherlands)• Pascal Boeckx (co-convener; Ghent University, Belgium)Senior keynote:• Thomas Röckmann (University of Utrecht, The Netherlands) – tentative title: " Possibilities, experiences and applications: the Thermo 253 ultra"Junior keynote:• Lukas Flierl (Physikalisch-Technische Bundesanstalt, Braunschweig, Germany) – Absolute Isotope RatiosAbstract:The possibilities for stable isotope analysis are continuously expanding. This session is meant to present new developments in instrumentation, analysis techniques, work on reference materials and novel analysis schemes and software. Contributions from both mass spectrometry and laser spectroscopy are welcome. As in this session the focus should be clearly on the measurement methodology, examples from applications are welcome, but only to illustrate the new methodology, not to present the results of the applications as such.2. Terrestrial and Aquatic BiogeochemistryConveners:• Christina Biasi (University of Eastern Finland, Finland)• Tobias Ruetting (co-convener; University of Gothernborg, Sweden)Senior keynote:• Wolfgang Wanek (University of Vienna): "Nitrogen isotope fractionation to inform on controls of soil nitrogen cycle processes"Junior keynote:• Isabell Klawonn (Leibniz-Institute of Freshwater Ecology and Inland Fisheries, Berlin (IGB))Abstract:Biogeochemistry deals with the biotic controls on the chemistry of the Earth System and concerns the cycling of elements. Those elements form the basis for life, representing macro- and micro-nutrients. Within the complex network of processes forming the biogeochemical cycles, stable isotopes offer powerful tools to study importance of pathways, turnover time and process rates. Stable isotopes tools to study biogeochemistry include both, the variation in natural abundance, natural isotope tracer as well as isotope enrichment studies. Furthermore, isotope modelling is increasingly applied for studying biogeochemical cycles.In this session, we welcome all contributions of stable isotope applications within biogeochemistry, also non-traditional elements and modelling approaches. We particularly welcome contributions investigating biogeochemistry across the terrestrial-aquatic boundary as well as exchange with the atmosphere.3. Plant EcophysiologyConveners:• Jaleh Ghashghaie (University of Paris-Saclay)• Thorsten Grams (co-convener; Technische Universität München)Senior keynote:• Lisa Wingate (French National Institute for Agricultural Research; France). Title: “Using stable isotopes to probe the carbon and water cycle”.Junior keynote:• Philipp Giesemann (University of Bayreuth, Germany). Title: “Green plants are not as green as they seem to be. Are half of the plant kingdom potentially cheating on their fungal partners?”)Abstract:This session covers applications of stable isotopes in plant ecophysiology at different scales from the cell to the ecosystem level. Hence, contributions on metabolic and physiological functioning of plants, their interactions with the environment and biosphere-atmosphere exchanges are welcome.Natural abundances of stable isotopes in bulk organic matter, different metabolic fractions, individual metabolites and intramolecular distribution of isotopes for a given metabolite reveal different isotope fractionating steps of involved processes. Similarly, exchange with the inorganic environment, i.e. atmosphere, soil, water etc., will affect isotopic signatures. Understanding of these fractionation processes will allow for better understanding of the biological system functioning.Similarly, tracer experiments with isotopically labelled source material, e.g. 13C-enriched CO2, 2H2O or 15N-enriched nutrients, applied in short- term or continuously allow for studying resource fluxes and turn-over of pools. At a smaller scale, positionally labelled compounds for example in nutrient solutions help understanding compartmentation, process kinetics etc.This session seeks to highlight advances in process understanding at different scales. We are inviting presentations using experiments, laboratory and field measurements as well as modelling approaches.4. Paleoclimatology & ArchaeologyConveners:• Marcel van der Meer, NIOZ Royal Netherlands Institute for Sea Research and Utrecht University• Laura Arppe (University of Helsinki)Keynotes• Senior keynote: Prof. Kerstin Lidén (Stockholm University)• Junior keynote: Julie Lattaud (ETH Zurich)Abstract:This session at JESIUM2020 is all about using stable isotopes to study how things were from archives such marine and lake sediments, tree-rings, ice cores, bogs, as well as remains of humans and animals. We would like to invite you to share your latest results and case studies, methodological insights, new proxies and applications for reconstructing past climates, environments and life. In archaeology, studies focused on isotope provenancing/tracking of humans, animals, artefacts and materials have proliferated in recent years, and we particularly encourage contributions touching upon isotope provenance.  In general we would like to encourage contributions on novel methodological developments, re-examination of old paradigms, approaches combining multiple isotope analyses on the same compound(s) or records, and isotope analysis of more difficult to analyze 5. Health and Medical SciencesConveners:• Genoud Guillaume (VTT, Technical Research Center Finland, Finland)• Dwight E. Matthews (University of Vermont, Burlington, VT, USA)Senior keynote:Prof. Daniel Tome (French National Institute for Agricultural Research, Research Unit for Nutritional Physiology and Eating Behaviour)Abstract:A common problem in medical research is following the metabolism of molecules into products, whether it is the metabolism of drugs or the metabolism of endogenous metabolites, such as glucose.  In the latter case, the tracers can be used to measure both synthetic and degradative rates of a wide range of metabolites.  Radioactive isotopes have been incorporated into molecules and used as tracers, but the use of stable isotopically labeled (SIL) molecules as tracers and measurement by mass spectrometry (MS) has many advantages.  SIL tracers and MS has become the gold standard method.  All SIL tracers have to be measured against a natural abundance background of stable isotopes.  Thus, the use of SIL tracers has bifurcated between two methods: use of highly labeled SIL tracers that can be measured by gas chromatography (GC) or liquid chromatography (LC) MS or use of SIL tracers of naturally low-level enriched tracers that require specialized isotope ratio (IR) MS methods.  Both provide a wealth of information about metabolic pathways, and talks and posters are solicited for work in this area highlighting use of SIL tracers in medical research. 6. Food Authenticity, Nutrition, ForensicConveners:• Federica Camin (Fondazione Edmund Mach, Department of Food Quality and Nutrition (DQAN), Italy)• Annikki Welling, (co-convener; Finnish Food Authority, Finland)Senior keynote:Simon Kelly (IAEA, Vienna, Austria): Food safety and traceabiliyAbstract:Food authentication is a rapidly growing field due to increasing public awareness concerning food quality and safety. Adulteration of food is deliberate and intentional substitution, addition, tampering or misrepresentation of food, food ingredients or food packaging or false or misleading statements made about a product for economic gain. Analysis of stable isotopic ratios in food authentication are especially useful in studies of misrepresentation of food, geographical origin, or production system (such as organic or conventional farming) because stable isotope ratios change with the source (natural or synthetic, botanical origin) climatic conditions, geographical origin, soil pedology, and geology of the locations of food ingredients origin. These studies are usually not straightforward analysis of SIR but requires stable isotope reference databases and multivariate modelling. We invite presentations of studies using stable isotope techniques in food adulteration, food authenticity, database collections and modelling approaches and building pipelines of food authenticity studies. 7. Atmospheric Sciences (Pollution, Climate Change, Cosmogeochemistry)Conveners:• Joachim Mohn  / Jing Wei (Empa, Switzerland)• Reinhard Well (Thünen Institute, Germany)Senior keynote:• Jan Kaiser (University of East Anglia, UK)Junior keynote:• Wendell W. Walters (Brown University, US) isotope measurements to monitor the emission, transformation, and atmosphere-biosphere exchange of reactive nitrogenAbstract:Stable isotope techniques provide a robust, yet under-utilized tool to trace atmospheric source, loss and conversion processes. In air pollution research, isotope fingerprints of anthropogenic or natural contaminants are very useful to track environmental change across space and time. Owing mainly to anthropogenic activities including land use change, industrial activities and fossil fuel burning, the concentration of e.g. CO2, CH4, N2O and NH3 in the atmosphere increased leading to climate and ecosystem change. Isotope ratio analysis provides an independent approach for distinguishing between source categories to constrain emission budgets and transformation processes. Isotopic composition of the planets and the small bodies of the solar system display rich variations that reflect physical and chemical processes involving isotopic mixing among different reservoirs as well as fractionations arising in chemical reactions.This session includes advances in analytical measurement techniques providing isotopic composition of molecules as well as position-specific and multiply substituted isotopic substitution of compounds. Contributions from field and laboratory experiments as well as theoretical and modelling studies are welcome. 8. Soil Carbon and Nitrogen Cycling, with Focus on Agricultural SoilsConveners:• Kristiina Karhu (University of Helsinki, Finland)• Marja Maljanen (co-convener; UEF, Finland)Senior keynote:• Christopher Poeplau, Institute of Climate-Smart Agriculture, Johann Heinrich von Thünen InstituteJunior keynote:• HemRaj Bhattarai (University of Eastern Finland). Stable isotope approaches to identify HONO production mechanisms from soilsAbstract:Maintaining and increasing soil organic matter stocks is important for climate change mitigation and soil fertility, and thus also for future food security. This session invites contributions on C and N cycling in soils, with a focus on agricultural soils, and on the possibilities for increasing soil C stocks through changes in agricultural management, while also mitigating N2O emissions. We especially welcome isotopic and biomarker studies that aim to understanding the mechanisms, and the contribution of plant-microbe interactions and microbial community composition to C accumulation, for example through stabilisation of microbial necromass in soil or through management changes affecting the microbial carbon use efficiency. We also welcome studies that focus on the management of GHG emissions and nutrient losses from agricultural soils. 9. Isoscape, Spatial Variability of Stable Isotopes (Migration, Food Webs)Convenors:• Loïc Michel (Deep Environment Laboratory, Ifremer Brest, France)• Mikko Kiljunen (University of Jyväskylä; Finland)Senior keynote:• Clive Trueman (Ocean and Earth Science, National Oceanography Centre, UK)Junior keynote:• Doreen Kohlbach (Alfred Wegener Institute, Germany / Fisheries & Oceans Canada)Abstract:Stable isotopes have been used as biological tracers for several decades, as they enable us to track changes and processes over time and/or space.  This has led to many breakthroughs in ecological research. Yet, the field of stable isotope ecology is as fruitful as ever, and researchers keep applying novel analytical methods (e.g. compound-specific isotope analysis), data analysis procedures (e.g. isoscapes, mixing models, niche metrics, trophic position estimations) and tracers (e.g. stable isotopes ratios of "non-traditional" elements, i.e. other than C, H, N, O and S).The aim of this session is to provide a forum for all ecologists who use stable isotopes for their research, regardless of their career stage, newcomers or experienced users alike. The session will be as inclusive as possible, with no limitations regarding the studied environments (terrestrial, freshwater or marine), the tackled questions (spatial ecology, animal migrations, food webs, ecological interactions, or other) or the considered organisation level (from individuals to whole ecosystems).We will welcome contributions aiming to develop novel methods, concepts or research directions; research questioning the assumptions underlying applications in stable isotope ecology; integrative approaches coupling stable isotopes with other ecological tracers; or simply case studies highlighting how established stable isotopes methods can provide answers to fundamental ecological questions. 10. Geochemistry and HydrologyConvenors:• Dirk Sachse (GFZ Potsdam, Germany)• Ansgar Kahmen (University of Basel, Switzerland)Junior keynote:Resolving hydroclimate signals from ecological shifts using H isotopes of concurrent lipid biomarkers (Nemiah Ladd, University of Freiburg, Germany)Abstract:The Earth’s geochemical cycles provide the ingredients for life on our planet. The resulting biogeochemical cycles are subject to constant change on timescales of seconds to millions of years forced by changes in weather and climate as well as continental collisions. Although biogeochemical cycles have maintained a relatively stable window for life, changes imparted by natural forces as well as the anthropogenic interference with the Earth system have and will significantly alter biogeochemical cycles, such as the water and carbon cycles. Stable isotopes are a unique tool to characterize biogeochemical cycles over different temporal and spatial scales, to identify biogeochemical transitions from one system state to another, determine forcing factors of change and quantify fluxes, and ultimately predict their behaviour under changed boundary conditions, such as the Anthropocene.In this session we invite contributions that focus on the characterization of biogeochemical processes and their changes over different temporal and spatial scales, developed novel isotopic tools to track these processes, with a special focus on the water and carbon cycles. We invite contributions that for example investigate metabolic changes in living organisms from microbes to plants, identify processes that determine the origin and fate of water in ecosystems, estimate fluxes of CO2 into and out of natural carbon pools (such as soils, permafrost, sedimentary organic matter), determine the importance of earth surface processes (such as sediment transport) on the carbon cycle as well as studies that aim to track past changes in the water and carbon cycles and identify their forcing factors. We also welcome studies developing models that use or predict isotopic ratio changes during biogeochemical processes. We particularly envision inter- and transdisciplinary approaches that bridge timescales to explore feedbacks between long-term geological and short-term biological processes. 11. Molecular & Intra-Molecular BiologyConvenors:• Marja Tiirola (University of Jyväskulä; Finland)• David Berry (University of Vienna, Division of Microbial Ecology)Senior keynote:• Nico Jehmlich (Helmholtz Centre for Environmental Research, Leipzig): Preliminary title: “Protein-SIP method and applications”Junior keynote:• Fatima Pereira (University of Vienna, Division of Microbial Ecology)Abstract:Recent technological advances and new stable isotope labelling approaches have greatly expanded our ability to study cell biology, biochemical pathways, and environmental questions. New instruments with increased sensitivity have opened up exciting possibilities to go from bulk measurements to highly sensitive compound-specific analyses. A variety of stable isotope labelled substrates are commercially-available, partly due to their need in the NMR spectroscopy. Compound-specific analysis of fatty acids, amino acids, proteins, and metabolites form a holistic approach to study microbial substrate utilization, and labelled DNA, RNA and proteins can be physically separated using stable isotope probing approaches. Furthermore, Nano-SIMS enables spatial analysis of the label e.g. in microbial biofilms, and heavy water labelling and Raman microspectroscopy can also be used for single-cell analysis of actively growing microbes. In cell biology, isotope labelling enables identification of peptides, proteins, and their components in DNA-protein and protein-protein complexes as well as studying e.g. post-translational modifications in proteins. This session will include the latest advances in stable isotope approaches used for detailed molecular analyses and increased mechanistic understanding. 

 

Thanks to the great engagement of our JESIUM 2020 sponsors and exhibitors!

 

 

Please note the following additional information concerning data protection: At our events you will be asked to wear a name badge. Furthermore, at events organised by us photos might be taken or films shot, members of the press might attend, lectures might be transferred via Skype, there might also be video conferences or live streamings with or without recording. Upon request we will gladly provide you with more details, or ask us on-site during the event.