Alexandra Grün
University of Koblenz and Landau
5 Papers
Alexandra Grün is an academic researcher from University of Koblenz and Landau. The author has contributed to research in topics: Chemistry & Extracellular polymeric substance. The author has an hindex of 4, co-authored 5 publications.
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Papers
Understanding the fate and biological effects of Ag- and TiO2-nanoparticles in the environment: The quest for advanced analytics and interdisciplinary concepts
Gabriele E. Schaumann,Allan Philippe,Mirco Bundschuh,Mirco Bundschuh,George Metreveli,Sondra Klitzke,Sondra Klitzke,Denis Rakcheev,Alexandra Grün,Samuel K. Kumahor,Melanie Kühn,Thomas Baumann,Friederike Lang,Werner Manz,Ralf Schulz,Hans-Jörg Vogel,Hans-Jörg Vogel +16 more
TL;DR: This review critically evaluates existing knowledge on colloidal aging mechanisms, biological functioning and transport of Ag NP and TiO2 NP in water and soil and it discusses challenges for concepts, experimental approaches and analytical methods in order to obtain a comprehensive understanding of the processes linking NP fate and effects.
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Effects of low dose silver nanoparticle treatment on the structure and community composition of bacterial freshwater biofilms.
Alexandra Grün,Constantin B. App,Andreas Breidenbach,Jutta Meier,George Metreveli,Gabriele E. Schaumann,Werner Manz +6 more
TL;DR: Changes in community composition were related with the displacement of putatively AgNP-sensitive bacterial taxa Actinob bacteria, Chloroflexi, and Cyanobacteria by taxa known for their enhanced adaptability towards metal stress, such as Acidobacteria, Sphingomonadales, and Comamonadaceae.
Sublethal concentrations of silver nanoparticles affect the mechanical stability of biofilms.
TL;DR: This finding demonstrates that exposure to Ag NPs triggers remarkable changes in biofilm adhesion and/or cohesiveness, and raises environmental concerns regarding Ag NP release into freshwater systems, even in sublethal concentrations.
25
Distribution of engineered Ag nanoparticles in the aquatic-terrestrial transition zone: a long-term indoor floodplain mesocosm study
George Metreveli,Sandra Kurtz,Ricki R. Rosenfeldt,Frank Seitz,Samuel K. Kumahor,Alexandra Grün,Sondra Klitzke,Sondra Klitzke,Sondra Klitzke,Hans-Jörg Vogel,Mirco Bundschuh,Mirco Bundschuh,Thomas Baumann,Ralf Schulz,Werner Manz,Friederike Lang,Gabriele E. Schaumann +16 more
TL;DR: In this paper, the authors used a floodplain stream mesocosm to enhance their understanding of the long-term distribution and biological effects of citrate-coated silver nanoparticles (Ag-NPs) in this ecosystem.
Impact of chemical composition of ecotoxicological test media on the stability and aggregation status of silver nanoparticles
George Metreveli,Bianca Frombold,Frank Seitz,Alexandra Grün,Allan Philippe,Ricki R. Rosenfeldt,Mirco Bundschuh,Mirco Bundschuh,Ralf Schulz,Werner Manz,Gabriele E. Schaumann +10 more
TL;DR: In this article, the authors investigated the aggregation and dissolution dynamics of citrate-stabilized silver nanoparticles (Ag NPs) by varying the composition of test media (TM) used during cultivation of organisms and biological effect (=ecotoxicological) studies, although this knowledge is required for an adequate interpretation of test outcomes and for a comparison among different studies.