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Eingeladener Vortrag
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OECD Prüfrichtlinie 125
(2023)
Diese Präsentation ist eine Einführung in die OECD TG 125 zur Bestimmung der Partikelgrößen von Nanomaterialien. Es wird auf die verchiedenen Probleme der Partikelgrößenbestimmung eingegangen wie z.B. verschiedene Oberflächenschichten, Äquivalenzdurchmesser und Verteilungsfunktionen. Gleichzeitig werden die neuen Begrifflichkeiten eingeführt, die in der TG 125 definiert neu werden.
Die Bestimmung der Nanopartikelgrößen- und -formverteilung nach OECD TG 125 mit einem Differentiellen Mobilitäts Analyse System (DMAS), auch bekannt als SMPS, wird vorgestellt:
- Generelles Messprinzip
- Welchen Durchmesser misst die Methode?
- Welche Partikel kann diese Methode messen?
- Welche Informationen kann diese Methode liefern?
- Wo stößt die Methode an ihre Grenzen?
- Implementierung und Datenauswertung,
- Reporting.
Anschließend wurde eine Q&A-Session für DMAS/SMPS organisiert.
Each year, an immense amount of plastic debris enters marine ecosystems, much of which ends up in the Great Pacific Garbage Patch (GPGP). The plastic fragments are home to a diverse community of microorganisms, and while researchers have gained a better understanding of these marine plastic biofilms, we lack insights into the physiology and genomic potential of the bacteria that colonize them. Examining the lifestyle of plastic colonizers from the GPGP is particularly intriguing, as the high concentration of plastics in this accumulation zone might allow for a microbial adaptation to this unique man-made habitat. A range of pigmentation was observed in 67 isolated strains obtained directly from plastic pieces sampled from the GPGP surface water. Sequence comparison between the cultivated bacterial strains and the 16S rRNA gene amplicon dataset confirmed that most of the cultivates could also be captured through DNA-only methods. Whole genome analysis of four taxonomically diverse representatives revealed multiple carotenoid pathways, including those to produce less common glycosylated carotenoids, like sarcinaxanthin glucoside. Further, we identified a potentially new Rhodobacteraceae species containing a photosynthetic gene cluster (PGC). Absorption analysis confirmed the actual production of the carotenoids and bacteriochlorophyll a. Floating plastics represent a habitat with strong UV-light exposure, making the protection with antioxidant carotenoids as well as the ability to use light as an energy source highly beneficial traits for plastic colonizers. Our findings indicate, that the production of pigments is a common adaption mechanism for plastic-associated bacteria, and that plastic biofilms present a so far overlooked source of rare carotenoids and light-harvesting mechanisms.
Angesichts der zunehmenden Digitalisierung und dem Einsatz datenintensiver Methodiken in der Wissenschaft stehen Forschende vor der Herausforderung, stetig wachsende Datenmengen nachvollziehbar zu dokumentieren, langfristig zu speichern und für Dritte nachnutzbar zu machen. Um diesen Anforderungen gerecht zu werden, bietet sich die Nutzung von Software-Lösungen an, welche Forschungsdatenmanagement mit der digitalen Dokumentation von Laborinventar und Experimenten in elektronischen Laborbüchern (engl. electronic lab notebooks (ELN)) verknüpfen.
The BAM Data Store
(2023)
As a partner in several NFDI consortia, the Bundesanstalt für Materialforschung und -prüfung (BAM, German federal institute for materials science and testing) contributes to research data standardization efforts in various domains of materials science and engineering (MSE). To implement a central research data management (RDM) infrastructure that meets the requirements of MSE groups at BAM, we initiated the Data Store pilot project in 2021. The resulting infrastructure should enable researchers to digitally document research processes and store related data in a standardized and interoperable manner. As a software solution, we chose openBIS, an open-source framework that is increasingly being used for RDM in MSE communities.
The pilot project was conducted for one year with five research groups across different organizational units and MSE disciplines. The main results are presented for the use case “nanoPlattform”. The group registered experimental steps and linked associated instruments and chemicals in the Data Store to ensure full traceability of data related to the synthesis of ~400 nanomaterials. The system also supported researchers in implementing RDM practices in their workflows, e.g., by automating data import and documentation and by integrating infrastructure for data analysis.
Based on the promising results of the pilot phase, we will roll out the Data Store as the central RDM infrastructure of BAM starting in 2023. We further aim to develop openBIS plugins, metadata standards, and RDM workflows to contribute to the openBIS community and to foster RDM in MSE.