Nano shapes micro : Impacts of metallic nanoparticles on microbial communities

Leiden Repository

Nano shapes micro : Impacts of metallic nanoparticles on microbial communities

Type: Doctoral Thesis
Title: Nano shapes micro : Impacts of metallic nanoparticles on microbial communities
Author: Zhai, Y.
Issue Date: 2019-09-25
Keywords: Nanoparticles
ecotoxicology
nanotoxicity
micorbial community
dosing frenquency
dose-response modelling
community composition
bacterial abundance
community functional profile
community metabolic profile
Abstract: This thesis aimed to investigate the impact of exposure dynamics, relative contributions of ENPs(particle) and ENPs(ion), and dosing regimens on the toxicity of ENPs varying in different physico-chemical properties, on the composition and functioning of soil microbial communities. The physico-chemical properties of ENPs could change their fate, and the exposure dynamics thus need to be taken into consideration for realistically characterizing the time-variable exposure in assessing toxicity. The metabolic profile of microbial community could change according to ENPs shapes, with nanoplates being more toxic than nanospheres and polygons. Regarding the microbial community composition, the effect of ENPs depended on exposure time and concentration. However, the alterations in community composition were not expressed in terms of community functioning, which indicates that genus specific changes occurred but not yet necessarily reflected biological significance with regard to community functioning. Functional redundancy might contribute to community tolerance to ENPs exposure. When exposed to more realistic ENPs exposure scenarios with multiple dosing frequencies instead of one-time injection, the repetitive exposure with low-dosing could induce a tendency towards larger alteration of both community composition and functioning. Our study thus provided further insights in understanding the impact of NPs on soil microbial communities towards environmentally relevant assessment.
Promotor: Supervisor: Peijnenburg W.J.G.M., Vijver M.G.
Faculty: Faculty of Science
University: Leiden University
Uri: urn:isbn:9789051912166
Handle: http://hdl.handle.net/1887/78661
 

Files in this item

Description Size View
application/pdf Full text 15.12Mb Under embargo until 2021-09-25
application/pdf Cover 2.027Mb View/Open
application/pdf Title pages_Contents 73.25Kb View/Open
application/pdf Chapter 1 371.9Kb View/Open
application/pdf Chapter 2 1.079Mb View/Open Full text at publisher site
application/pdf Chapter 3 3.504Mb View/Open Full text at publisher site
application/pdf Chapter 4 7.206Mb Under embargo until 2021-09-25
application/pdf Chapter 5 2.750Mb Under embargo until 2021-03-25
application/pdf Chapter 6 444.2Kb View/Open
application/pdf References 190.3Kb View/Open
application/pdf Summary in English 91.98Kb View/Open
application/pdf Summary in Dutch 93.09Kb View/Open
application/pdf Curriculum Vita ... lications_Acknowledgements 146.6Kb View/Open
application/pdf Propositions 124.0Kb View/Open

This item appears in the following Collection(s)