A toxic chemical fate, transport and bioaccumulation modeling system was developed by linking EPA's WASTOX FORTRAN code to ArcView. I use agent-based modeling (ABM) and systems bioecology. Ferdi Hellweger, Kevin Farley, Darin Damiani and Paul Anid Presented at the 2001 Esri International User Conference San Diego, CA, JABSTRACT. Please send your written application with the reference number and the usual documents (letter of motivation, CV, reference letter, certificates (PhD, Master, Bachelor), list of publications and link to PhD, all combined in a pdf file, max. A nutrient-reduction management scenario indicates that Anabaena densities increase because they are less sensitive to water column nutrient levels (because of the sediment bed source) than other species. Ferdi L Hellweger 1 Affiliation 1 Specialty Area of Water Quality Engineering (Wasserreinhaltung), Institute of Environmental Science and Engineering, Technical University of Berlin, 10623 Berlin, Germany email: . I am interested in microbial ecology, focusing mostly on surface waters. Loop enables you to stay up-to-date with the latest discoveries and news, connect with researchers and form new collaborations. Hellweger, Population Dynamics of Escherichia coli in Surface Water, JAWRA Journal of the American Water Resources Association, 10.1111/j., 47, 3, (611-619), (2011). Loop is the open research network that increases the discoverability and impact of researchers and their work. An in silico gene knockout experiment (akinete formation is prohibited) showed that the formation of resting stages is of critical importance to the survival of the population on an annual basis. Vanni Bucci, Marin Vuli, Xiaodan Ruan, Ferdi L. Code and User Guide for model presented in: Dynamic carbon flux network of a diverse marine microbial community Mayerhofer, et al. An in silico tracing experiment showed that most water column cells (~90%) originated from cells located in the sediment bed during the preceding winter. However, most of the long-term nutrient uptake for Anabaena occurs in the sediment bed, which suggests that the sediment bed is not just a convenient overwintering location but may also be the primary source of nutrients. Model analysis shows that the internal loading of phosphorus (P) due to germination from the sediment bed is ~10% of the total input. The model is part of a coupled Eulerian-Lagrangian model and can reproduce the main features of the observed seasonal and interannual population dynamics in Bugach Reservoir (Siberia), including an unexpectedly large bloom in a year with low nutrient concentrations. THE INDIVIDUAL MICROBE: SINGLE-CELL ANALYSIS AND AGENT-BASED MODELLING. We present a new agent-based (also known as individual-based) model of Anabaena that includes the formation and behavior of akinetes. I am an Associate Professor in the Civil and Environmental Engineering Department and Acting Director of the Center for Urban Environmental Studies at. Hellweger, Jan-Ulrich Kreft, Clara Prats, Weiwen Zhang. The cyanobacterium Anabaena flos-aquae and many other phytoplankton species have a complex life cycle that includes a resting stage (akinete).
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