Promotor: Prof.dr. A.W. van der Vaart

Mycoheterotrophy is a particular mode of life in which plants obtain carbohydrates from their associated fungal partners, instead of by using photosynthesis.

Promotor: T. Schmidt

Promotor: P.D. Grünwald

Promotores: C. J. ten Cate; M. A. Ainslie. Co-promotor: W. Slabbekoorn

The high velocity tail of the total velocity distribution of stars provides essential insight into fundamental properties of the Galaxy.

At the largest scales, two ingredients dictate the distribution of matter in the Universe. The first is dark matter, acting as an invisible scaffolding held together by gravitational forces.

Of all the mass in our Universe, 80% is thought to consist of a hypothetical and invisible substance called dark matter (DM).

Early time-resolved experiments by Frauenfelder on the ensemble of the kinetic rebinding of CO to myoglobin molecules resulted in a stretched exponential relaxa-tion due to a very large spread of the reaction rates of individual molecules.

This thesis consists of two main parts. The first part (Chapters 2 and 3) deals with a class of Markov process called Quasi-Skipfree (QSF) processes.

We investigate the buildup of galaxies from various vantage points. The first two chapters focus on the stellar content of galaxies, especially the distribution of stellar masses at birth and potential variations therein in various galactic environments.

Promotor: P. T. de Zeeuw, Co-promotor: N. Neumayer; G. van de Ven

Which traits and/or trade-offs determine benefits of being deciduous or evergreen?

Jaarlijks keren er in Nederland ongeveer 33.000 ex-gedetineerden terug in de maatschappij waarvan rond de 1.500 plegers zijn van ernstige gewelds- en zedenmisdrijven. Hoewel het grootste deel van deze herintredingen zonder veel commotie verloopt, gaan enkele gevallen gepaard met grote maatschappelijke…

This thesis is divided into two parts. In Part I we study metastability properties of queue-based random-access protocols for wireless networks. The network is modeledas a bipartite graph whose edges represent interference constraints. In Part II we study spectra of inhomogeneous Erdős-Rényi random…

Wat zijn de risico's van nanodeeltjes?

Luister naar de wetenschapspodcast van de Universiteit Leiden! In elke aflevering krijg je antwoord op jouw vragen over muggen, exoplaneten, Artificiële intelligentie, biologie en nog veel meer!

Op vrijdag 17 september 2021 sprak prof.dr.ing. Bram Klievink zijn oratie uit getiteld: 'Hollen én stilstaan: hoe data en digitalisering de overheid veranderen'.

Jacques Sevat gaf inzicht in de praktische en juridische aspecten van global collateral management: het constante beheer van zekerheden om de risico’s te beperken die een wereldwijd opererende bank als ING dagelijks loopt.

Promotie

Promotor: Erik F. Smets, Co-promotores: Barbara Gravendeel, Niels Raes

In photoactivated chemotherapy (PACT), a biologically active compound is caged by a light-cleavable protecting group.

Examining if large scale application of new energy pathways can be constrained by materials and emissions.

The findings in this thesis improve the understanding of 1) the relationship between exposure characteristics and toxicity of ENPs, 2) the joint toxic action of ENP mixtures and the comparison to metal salt mixtures, 3) how NOM affects the individual and joint toxicity of ENPs, 4) the extent of trophic…

Several single-stranded RNA viruses make use of Xrn1-resistant RNAs in their 3’ untranslated regions of their genome RNAs in order to increase their pathogenicity.

In this thesis, the focus lies on studying glucocorticoid receptor dynamics in living cells with the aim of understanding how this transcription factor finds its DNA target sites to regulate transcription.

A century ago, it was unclear whether the stars in the sky were clustered in groups, or widely spread in the universe.

Supervisor: S.F. Portegies Zwart Co-Supervisor: A.G.A. Brown

Promotor: Prof.dr. E. F. van Dishoeck

This thesis focuses on the X-ray spectral analysis of merging galaxy clusters and the plasma code development for future high-resolution X-ray spectroscopy observations.

Promotor: M.T.M. Koper, Co-promotor: J.B.F. Juurlink

Food security is challenged by a growing global population and by climate change. Drought and soil salinity are considered the most important ones that inhibit crop yield and distribution. Worryingly, climate change is predicted to increase not only their frequency and severity, but also their co-occurrence,…

Promotor: S.M. Verduyn Lunel

An Active Galactic Nucleus (AGN) is a highly luminous region at the center of a galaxy, powered by the accretion into a supermassive black hole and emitting energy from radio waves to gamma rays, often outshining the host galaxy.

Galaxies in the local Universe fall into two main categories of spirals and ellipticals. In this Thesis, we explore the structural evolution of galaxies into this bimodal distribution.

In astronomy, the interpration of observations and measurements plays a crucial role: we rely purely and fundamentally on the information that reaches us as observers. And 80% of all matter in the universe is undetectable directly.

We explored how to morphologically classify well-resolved jetted radio-loud active galactic nuclei (RLAGN) in the LOw Frequency Array (LOFAR) Two-metre Sky Survey (LoTSS) using machine learning.

Taxonomy as a science has accumulated data and knowledge for more than 250 years.

Trigonostemon Blume is a plant genus in the family Euphorbiaceae comprising 59 species.

Promotor: Prof.dr. A.G.G.M. Tielens

The Vallesian, 11.1-9 Ma, was a special time in the Vallès-Penedes basin near Barcelona, where a biodiversity hotspot existed. Europe had a subtropical climate, with rhinos, forest giraffes, lions, hyenas, flying squirrels and primates.

The availability of indicators based on social media has opened the possibility to track the online interactions between social media users and scholarly entities.

Promotor: G.F.A. Kersten, W. Jiskoot, Co-promotor: B. Metz

Every organisms in the tree of life faces the same challenge: the length of its DNA exceeds the volume of the cell it needs to fit in. Several strategies have evolved to solve this problem, one of them being the expression of proteins that bind and organize the DNA.

Promotor: W.Th.F. den Hollander Co-Promotor: F.M. Spieksma

This thesis presents pioneering work on the panchromatic emission of some of the most luminous galaxies in the early Universe: star forming galaxies and active galactic nuclei.

Promotor: Prof.dr. E Gittenberger, Co-Promotores: C.H.J.M. Fransen, B.W. Hoeksema