Christian Stamm


Last Name

Stamm

First Name

Christian

ORCID

0000-0001-5611-9084

Organisational unit

Search Results

Publications1 - 10 of 52
  • Unraveling the riverine antibiotic resistome: The downstream fate of anthropogenic inputs
    Item type: Journal Article
    Lee, Jangwoo; Ju, Feng; Maile-Moskowitz, Ayella; et al. (2021)
    Water Research
    River networks are one of the main routes by which the public could be exposed to environmental sources of antibiotic resistance, that may be introduced e.g. via treated wastewater. In this study, we applied a comprehensive integrated analysis encompassing mass-flow concepts, chemistry, bacterial plate counts, resistance gene quantification and shotgun metagenomics to track the fate of the resistome (collective antibiotic resistance genes (ARGs) in a microbial community) of treated wastewater in two Swiss rivers at the kilometer scale. The levels of certain ARGs and the class 1 integron integrase gene (intI1) commonly associated with anthropogenic sources of ARGs decreased quickly over short distances (2-2.5 km) downstream of wastewater discharge points. Mass-flow analysis based on conservative tracers suggested this decrease was attributable mainly to dilution but ARG loadings frequently also decreased (e.g., 55.0-98.5 % for ermB and tetW) over the longest studied distances (6.8 and 13.7 km downstream). Metagenomic analysis confirmed that ARG of wastewater-origin did not persist in rivers after 5 ~ 6.8 km downstream distance. sul1 and intI1 levels and loadings were more variable and even increased sharply at 5 ~ 6.8 km downstream distance on one occasion. While input from agriculture and in-situ positive selection pressure for organisms carrying ARGs cannot be excluded, in-system growth of biomass is a more probable explanation. The potential for direct human exposure to the resistome of wastewater-origin thus appeared to typically abate rapidly in the studied rivers. However, the riverine aquatic resistome was also dynamic, as evidenced by the increase of certain gene markers downstream, without obvious sources of anthropogenic contamination. This study provides new insight into drivers of riverine resistomes and pinpoints key monitoring targets indicative of where human sources and exposures are likely to be most acute.
  • The X-ray View on Ultrafast Magnetism
    Item type: Other Conference Item
    Stamm, Christian (2016)
  • Atomically thin magnetic microstructures
    Item type: Doctoral Thesis
    Stamm, Christian (2000)
  • Dissipation of spin angular momentum in magnetic switching
    Item type: Journal Article
    Stamm, Christian; Tudosa, I.; Siegmann, H. C.; et al. (2005)
    Physical Review Letters
  • Spin Hall effect measured by magneto-optical Kerr microscopy
    Item type: Other Conference Item
    Stamm, Christian; Murer, Christoph; Berritta, Marco; et al. (2017)
  • Ultrafast angular momentum transfer in multisublattice ferrimagnets
    Item type: Journal Article
    Bergeard, Nicolas; López-Flores, Víctor; Halte, Valérie; et al. (2014)
    Nature Communications
  • Magnetic Domains
    Item type: Encyclopedia Entry
    Portmann, Oliver; Vaterlaus, Andreas; Stamm, Christian; et al. (2024)
    Encyclopedia of Condensed Matter Physics
  • Towards circular phosphorus: The need of inter- and transdisciplinary research to close the broken cycle
    Item type: Journal Article
    Stamm, Christian; Binder, Claudia R.; Frossard, Emmanuel; et al. (2022)
    Ambio
    Phosphorus (P) is an essential element to all living beings but also a finite resource. P-related problems center around broken P cycles from local to global scales. This paper presents outcomes from the 9th International Phosphorus Workshop (IPW9) held 2019 on how to move towards a sustainable P management. It is based on two sequential discussion rounds with all participants. Important progress was reported regarding the awareness of P as finite mineable resource, technologies to recycle P, and legislation towards a circular P economy. Yet, critical deficits were identified such as how to handle legacy P, how climate change may affect ecosystem P cycling, or working business models to up-scale existing recycling models. Workshop participants argued for more transdisciplinary networks to narrow a perceived sciencepractice/policy gap. While this gap may be smaller in reality as illustrated with a Swiss example, we formulate recommendations how to bridge this gap more effectively.
  • Prediction of dissolved reactive phosphorus losses from small agricultural catchments: calibration andvalidation of a parsimonious model
    Item type: Working Paper
    Hahn, Claudia; Prasuhn, Volker; Lazzarotto, Patrick; et al. (2013)
    Hydrology and Earth System Sciences Discussions
    Eutrophication of surface waters due to diffuse phosphorus (P) losses continues to bea severe water quality problem world-wide, causing the loss of ecosystem functions ofthe respective water bodies. Phosphorus in runoffoften originates from a small fractionof a catchment only. Targeting mitigation measures to these critical source areas (CSA) is expected to be most efficient and cost-effective, but requires suitable tools.Here we investigated the capability of the parsimonious Rainfall-Runoff-Phosphorus(RRP) model to identify CSA in grassland-dominated catchments based on readilyavailable soil and topographic data. After simultaneous calibration on runoffdata fromfour small hilly catchments on the Swiss Plateau, the model was validated on a different catchment in the same region without further calibration. The RRP model adequatelysimulated the discharge and dissolved reactive P (DRP) export from the validationcatchment. Sensitivity analysis showed that the model predictions were robust with re-spect to the classification of soils into “poorly drained” and “well drained”, based onthe available soil map. Comparing spatial hydrological model predictions with field data from the validation catchment provided further evidence that the assumptions under-lying the model are valid and that the model adequately accounts for the dominant Pexport processes in the target region. Thus, the parsimonious RRP model is a valu-able tool that can be used to determine CSA. Despite the considerable predictive un-certainty regarding the spatial extent of CSAs the RRP can provide guidance for the implementation of mitigation measures. The model helps to identify those parts of acatchment where high DRP losses are expected or can be excluded with high confi-dence. Legacy P was predicted to be the dominant source for DRP losses and thus, incombination with hydrologic active areas, a high risk for water quality.
  • Magneto-optical detection of spin-orbit torques in ferromagnetic/heavy metal heterostructures
    Item type: Conference Poster
    Murer, Christoph; Stamm, Christian; Gabureac, Mihai; et al. (2016)
Publications1 - 10 of 52