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.

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…

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

The endophytic microbiota is a community of various microorganisms that reside in plant tissue. These microbes are known to promote plant health and resilience, and their members do not simply exist side by side.

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

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.

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.

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.

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.

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

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.

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

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

The dissertation describes TEM experiments on heterogeneous catalysts.

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.

This thesis describes a study from both a theoreticaL and an experimental point of view.

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…

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

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.

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.

Ferritin is a spherical metalloprotein, capable of storing and releasing iron in a controllable way. It is composed of a protein shell of about 12 nm and within its cavity, iron is stored in a mineral form.

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 spectroscopy has become a powerful method for using organic fluorescent molecules in numerous applications.

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.

Het logo van de Universiteit Leiden, met letters zo klein als een bacterie. Wetenschappers van het LUMC en het Instituut Biologie hebben het kleinste logo ooit van onze universiteit gemaakt. Een grapje met een serieuze ondertoon: met de nieuwe microscoop waarmee het logo is gemaakt, kunnen zij nog gedetailleerder…

Promotor: T.H. Oosterkamp

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

In this Ph.D. thesis we study the interaction of low energy electrons with thin materials, namely layered materials (graphene, hexagonal boron nitride, molybdenum disulfide) and organic films. At these low energies the quantum mechanical wavelength of the electron wave function is in the order of a…

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.

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.

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.

Een internationaal team met onderzoekers uit Leiden heeft ontdekt hoe een bacterie een intern systeem heeft herschikt om grip op beweging te krijgen. Gecontroleerde beweging is heel belangrijk bij het binnendringen van een gastheer, met mogelijk ziekte tot gevolg. Publicatie op 27 april in Nature Co…

De Nobelprijs voor Scheikunde 2017 is uitgereikt aan Jacques Dubochet, Richard Henderson en Joachim Frank, voor hun ontwikkeling van de cryo-elektronenmicroscopie. Met deze techniek kunnen biomoleculen in 3D in beeld gebracht worden, legt hoogleraar Ultrastructuurbiologie Ariane Briegel uit.

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

Promotor: J. Zaanen, Co-Promotor: V. Juricic

Promotores: G.W. Canters, T.J. Aartsma

The research in this thesis is focused on tomographic reconstruction based on two imaging modalities in electron microscopy.

Dit proefschrift gaat over theoretische oppervlakte chemie binnen het veld van de heterogene katalyse.

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.

Inverse problems are problems where we want to estimate the values of certain parameters of a system given observations of the system. Such problems occur in several areas of science and engineering. Inverse problems are often ill-posed, which means that the observations of the system do not uniquely…

'Het Nederlands Centrum voor Elektronen Nanoscopie (NeCEN) is een mooi voorbeeld van een faciliteit die op nationale schaal toegang biedt tot de laatste ontwikkelen op het gebied van cryo-elektronen microscopie', dat schrijft Sriram Subramaniam, een vooraanstaand leider in deze tak van sport, in het…

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

The inverse electron demand Diels-Alder (IEDDA) pyridazine elimination emerged in 2013 as a new bioorthogonal reaction and constitutes a prime example of what is now known as dissociative bioorthogonal chemistry. The research described in this Thesis aims to develop synthetic strategies which enable…

This thesis explores how electron paramagnetic resonance (EPR) spectroscopy can be used to investigate key biochemical processes.