PhD ceremony: Mr. D. de Corte, 11.00 uur, Academiegebouw, Broerstraat 5, Groningen
Dissertation: Norms of constitutionalism in the international constitutionalisation debate
Promotor(s): prof. M.M.T.A. Brus
Faculty: Mathematics and Natural Sciences
The results presented in the PhD thesis of Daniele de Corte suggest that the dark ocean is more dynamic than commonly assumed and that the viral-host interactions change in response to changes in the biotic and abiotic variables.
Three cruises were conducted by him to assess the diversity of prokaryotes and the links between viruses and prokaryotes in the Atlantic and the Mediterranean Sea throughout the water column down to abyssopelagic (below 4000 m depth) waters. A high variability in the prokaryotic and viral abundance and production was found in the bathy- and abyssopelagic zones, indicating that the heterogeneity of the microbiota in the bathy- and abyssopelagic waters is as pronounced as in the epipelagic layer (0-150 m depth). Additionally, the community composition of the different microbial components, assessed by fingerprinting techniques, showed that the bacterial, archaeal and viral community were stratified with depth. The contribution of lysogenic and/or pseudolysogenic to total viral production increases towards the deep waters and towards more oligotrophic regions. Also, the low temperature in the abyssopelagic realm might provoke a longer persistence of infective viruses (lower decay rates) than in epipelagic waters exposed to high temperature and ultraviolet radiation.
Furthermore, the results from a study of De Corte in the coastal Arctic showed clear differences between the bulk bacterial community and its active fraction. Moreover, the discrepancies found between viral and prokaryotic communities in this coastal Arctic environment might be explained by the differential effect of the UV, and/or the high particle load of terrestrial origin on the prokaryotic and viral production.
Friday 1 December, marked the official opening of the Mars Yard! Over the past few months, the students of the UG GEARS team have worked hard to realize the Mars Yard on Zernike campus. They will participate in the on-location competition of the...
Bayu Jayawardhana has been appointed scientific director of DISC, the interuniversity research institute and graduate school that unites all university groups in the Netherlands that are active in systems and control theory and engineering. The...
Researchers Clemens Mayer and Danny Incarnato of the University of Groningen have been awarded an ERC Consolidator Grant.
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