Bacteriophages, or phages for short, are the most abundant biological entity in nature. They shape bacterial communities and are a major driving force in bacterial evolution.

Promotor: T. Schmidt

De Microscopy Unit huisvest, onderhoudt en coördineert vrijwel alle microscopieapparatuur van het IBL. De beschikbare apparatuur varieert van conventionele licht- en fluorescentiemicroscopen tot confocale laser- en elektronenmicroscopen. Er is bovendien apparatuur beschikbaar voor histologie, met inbegrip…

Single-Molecule Microscopy (SMM) techniques constitute a group of powerful imaging tools that enable researchers to study the dynamic behavior of individual molecules.

There are many interpretations of quantum mechanics, and ultimately experiments are needed to verify or falsify these interpretations.

Electron microscopy has become an extremely important techniquein a wide variety of elds.

This thesis presents insights from our study of various correlated electron systems with a scanning tunneling microscope (STM). In ordinary metals, electron-electron interactions exist, but get substantially screened due to the sheer number of electrons.

Cryogenic electron microscopy (cryo-EM) is a powerful technique used to visualize the inside of cells and to study specific protein complexes. Within this thesis, I describe the use of various cryo-EM techniques to gain insight into the structural changes of the human pathogen, Vibrio cholerae, as it…

In this thesis we investigated the ability of two-photon multifocal microscopy for single-molecule microscopy in live cells and organisms.

This thesis described the development of novel scanning tunneling microscopy techniques to investigate strongly correlated electronic states in quantum matter.

Promotor: Prof.dr. J.M. van Ruitenbeek, Prof.dr. R.M. Tromp

In surface science there is great effort to move from studying simple, flat model surfaces in vacuum to investigating more complex model catalysts in gas environments (in situ). This thesis gives three examples of such studies using microscopy and spectroscopy.

The main research question of this thesis was: Can nitrogen cycling on dairy farms on peat soil in the Dutch Green Heart area be improved by adapting management to the nitrogen supply from soil and by using other grassland species and crops without affecting milk production?

In this thesis we use Josephson and noise scanning tunneling microscopy for the study of conventional, unconventional (iron-based) and disordered superconductors. On the one hand, Josephson scanning tunneling microscopy allows us to directly visualize the superfluid density with high spatial resolut…

In this thesis, we describe the latest advances in SQUID-detected Magnetic Resonance Force Microscopy (MRFM).

In this thesis, we show how MRFM can usefully contribute to the field of condensed-matter.

Promotores: Prof.dr. H.P. Spaink & Prof.dr. P.C.W. Hogendoorn Co-promotor: Dr. M.J.M. Schaaf

Promotores: Prof.dr. C.U. Keller, Prof.dr. H.C. Gerritsen

Molecular materials have been a subject of interest in fundamental research and applications for decades, and have been studied as bulk crystals, (thin) films and as individual molecules, due to the large variety in their properties. This dissertation explores pentacene crystals near the two-dimensional…

Promotor: T.H. Oosterkamp

Dit onderzoekscluster maakt deel uit van het onderzoeksprogramma ‘Institutions, Decisions and Collective Behaviour’.

n this PhD thesis, the recombination of different atomic lattices in stacked 2D materials such as twisted bilayer graphene is studied. Using the different possibilities of Low-Energy Electron Microscopy (LEEM), the domain forming between the two atomic layers with small differences is studied.

Het doel van deze faciliteit is om het biomedisch onderzoek te versnellen door toegang te bieden tot geavanceerde licht- en elektronenmicroscopie en door het delen van expertise over monstervoorbereiding, beeldvormingsmodaliteiten, gegevensopslag en beeldanalyse.

In this thesis, we develop a novel technique called Optical Near-field Electron Microscopy (ONEM), which aims to combine the advantages of both optical and electron microscopy: the high resolution of electron microscopy and the low sample damage of optical microscopy.

The dissertation describes TEM experiments on heterogeneous catalysts.

Plants and soils from natural ecosystems harbor great diversity of soil microorganisms, which could potentially contribute to the sustainability of horticulture. The knowledge about using wild plant species and soil from natural ecosystem to improve the crop health will advance the application of ecological…

Bacterial chemosensory arrays are protein assemblies that are the key structural and functional component for motile bacteria to sense their internal or environmental chemical signals.

Promotie

Promotor: Prof.dr. J.P. Abrahams, Prof.dr. M. van Heel

Promotor: J.P. Abrahams, Co-promotor: T. Grüne

Promotor: B. van de Water

Promotor: B. van de Water

In this thesis the combinatorial use of bioorthogonal labelling and Electron Microscopy (EM)-based imaging techniques is explored to enable observations of specific molecular targets in their ultrastructural context within the cell.

Leidse onderzoekers hebben aanwijzingen gevonden waarom een zeldzame zwangerschapsziekte bij sommige baby’s mild verloopt en bij andere levensgevaarlijk is. De vondst opent de deur naar een test die ernstige gevallen al tijdens de zwangerschap kan opsporen. Een behandeling bestaat gelukkig al.

From surface science towards industrial practice using high-pressure scanning tunneling microscopy.

Microscopic insight on lipid-based nanomedicine in vivo remains limited to the perception of the knowledge that could be obtained: if we interpret only what we see, then we only believe to know. Although believing to know encapsulates an undefined amount of uncertainty in the exploration of lipid-based…

De Tweede Kamerverkiezingen die staan gepland voor maart 2017 zullen resulteren in een versnipperd parlement en een lastige kabinetsformatie, aldus de politicoloog Hans Vollaard (Universiteit Leiden) in een bijdrage aan het EUROPP-blog.

Dit artikel onderzoekt de effecten van de invoering van proportionele vertegenwoordiging (PR) op de politieke vertegenwoordiging van vrouwen.

This article examines how immigration from Central and Eastern Europe influences political support for Eurosceptic parties.

‘Een eerste referendum op Donald Trumps presidentschap’, zo worden de opkomende midterm elections ook wel genoemd. Tijdens deze tussentijdse verkiezingen kunnen Amerikanen hun stem uitbrengen voor verschillende politieke functies. Wat betekent dit voor de Amerikaanse politiek? Sara Polak, universitair…

This thesis investigates reactive interfaces in surface science across three domains: heterogeneous catalysis, environmental nanoplastics, and two-dimensional materials.

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.

This dissertation revolves around the design and implementation of novel instrumentation and related measurement techniques, at the single molecule level, for use in biophysical research. Chapter 1 presents an introduction to the field of fluorescence-based single molecule measurements. In particular,…

This thesis comprises the development of reproducible synthesis procedures for two-dimensional materials (composed of boron, nitrogen and carbon) on different metallic surfaces.

Materials with strongly correlated electrons show some of the most mysterious and exotic phases of quantum matter, such as unconventional superconductivity, quantum criticality and strange metal phase.

Bacteria have the ability to alter their morphology in order to adapt to changing environments.

This doctoral thesis is an effort to understand how lipid phase-separation induced by diacylglycerol analogues in lipid-based nanoparticles affects their in vivo behavior, leading to specific nanoparticle-protein communications and selective cell targeting.

In this thesis, bioorthogonal chemistry is combined with correlative light-electron microscopy to selectively label and study pathogenic intracellular bacteria within the host immune cell.

There is an urgent need for more physiologically relevant cell culture methods to guide compound selection in pre-clinical stages of the drug development pipeline.

In condensed matter systems electron-electron interactions, negligible in everyday metals, can dramatically alter the electronic behavior of the system. Examples of such altered behavior include high-temperature superconductivity and modulation of the electron density.