In deze opleiding, verzorgd door het Leiden Institute of Chemistry, zoek je naar oplossingen voor complexe, maatschappelijke problemen in volksgezondheid en milieuvraagstukken. We bieden op maat gemaakte, individuele studieprogramma’s, en je hebt de mogelijkheid om onderzoek te doen in het buitenland…

Promotor: Prof.dr.ir. J.G.E.M. Fraaije, Co-promotor: A. Kros

If mankind wants to survive into the 22nd century, we will need to change the way we live drastically. The human impact on our planet is everywhere, we are changing the atmosphere, the oceans and the land, leading to global warming, climate change, loss of biodiversity and pervasive pollution. There…

In a typical glycosylation reaction, a donor is activated to form a (variety of) electrophilic species which can react with a nucleophilic acceptor, following a reaction mechanism having both SN1 and SN2 character.

The research described in this thesis focused on the use of bioorthogonal antigens to investigate immunological processes in antigen presenting cells. Bioorthogonal antigens are antigenic proteins produced through recombinant expression in a methionine auxotrophic E. coli strain.

This thesis systematically studies the physicochemical properties of non-planar, propeller-shaped, polycyclic aromatic hydrocarbons. The synthesis of several so-called propellerenes is described on a gram scale, using optimized procedures aimed at using less hazardous reagents and reducing the amount…

This thesis describes the synthesis, analysis of various tetrazine bearing compounds and use in bioorthogonal chemistry.

Plant-microbe interaction resulted in different physio/chemical responses by host plant and interacting rhizobacteria.

Biopolymer sequencing with graphene edge-based tunnel junctions has the potential to overcome current limitations with the third generation of sequencing based on biological nanopores.

The first steps are made in personalised cancer vaccination strategies, which aim to induce a more specific immune response with fewer side effects. The activation of cytotoxic T cells is crucial for an effective immune response.

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.

Laboratory, observation and modeling work on the dissociation of polycyclic aromatic hydrocarbons in interstellar environments and the formation of new molecular species through the fragmentation process.

In het schoolvak scheikunde is de concept-context benadering ingevoerd. Hans Vogelzang onderzocht of de Scrum-methodologie kan helpen bij het vormgeven van lessen met deze benadering.

Multiple stars, that is two or more stars composing a gravitationally bound system, are common in the universe.

This thesis is largely an experimental study on the formation of solid-state simple and complex organic molecules in the H2O-rich and CO-rich ice phases of dense interstellar clouds and dark cores.

Promotor: J. Schaye

This thesis examines the link between simple molecules and the underlying structure and chemistry within protoplanetary disks - the birthplaces of planets.

Advanced mass spectrometry of glycosphingolipids takes the central stage in this thesis. Investigations focus on characterization of glycosphingolipid metabolism in health and disease with emphasis to the detection and accurate quantitation of known and so far unknown glycosphingolipids and closely…

To address the fundamental questions of how life on Earth emerged and how common life may be in the Universe, it is crucial to know the chemical composition of the planet-forming material.

Promotor: J.W.M. Frenken Co-Promotores: I.M.N. Groot; L.B.F. Juurlink

With the rise of multi-drug resistant bacterial pathogens, the possibility of a post-antibiotic world is quickly becoming reality.

Onderwijsminister Jet Bussemaker kreeg op de Dag van de Excellentie op 20 juni een exemplaar van ‘Chemistry in Conflict’, een educatief boek over de rol van chemie in oorlogsvoering. Ludo Juurlink, directeur van het Junior Science Lab, overhandigde het boek.

A dense region of a gaseous and dusty cloud collapses to form a protostar surrounded by a disk and an envelope. This thesis uses both observations and models to study physical and chemical conditions of these protostellar systems which are likely where planets start to form.

This work describes the use of click-to-release chemistry to get spatiotemporal control over immunocytokine activity. Until now, immunocytokines (cytokines coupled to a tumor-targeting-moiety) remained active throughout the body, being able to bind their respective receptors, causing mild to severe…

The research described in this thesis focused on the preparation of S/N functionalized carbene ligands and their transition metal complexes, and the exploration of their application as electrocatalysts for proton reduction.

This thesis has described novel synthetic methods to produce a variety of (glyco)peptides and their application in the study of various immunological processes.

Carbohydrates, or sugars, are the most diverse and most abundant biomolecules known. However, the isolation of carbohydrate samples in sufficient amounts and purity is often impractical or even impossible, so the chemical synthesis of glycosides becomes relevant. The glycosylation reaction, in which…

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…

Micro-organismen die tijdelijk ‘in slaap vallen’ spelen een belangrijke rol bij de evolutie en het voortbestaan van de populatie waar ze deel van uitmaken. Wiskundige Shubhamoy Nandan deed onderzoek naar die ‘sluimerstand’ bij micro-organismen op basis van een vernieuwend wiskundig model.

Hermelijn Smits is hoogleraar Immuunmodulatie door gastheercommensaal interacties. In die rol vergroot zij het huidige begrip van de manier waarop microben en parasieten ons immuunsysteem vormgeven om ons te beschermen tegen infecties aan de luchtwegen en chronische ontstekingsziekten. In haar oratie…

Self-assembly is an abundant process in nature and is vital to many processes in living organisms.

Promotor: Prof.dr. E. Bouwman

Een interdisciplinair team van Leidse wetenschappers heeft ontdekt dat de tering, een heftig bijverschijnsel van tuberculose, voor alle onderzochte mensen en diersoorten hetzelfde is. De ontdekking biedt nieuwe mogelijkheden om de nog onvoldoende begrepen aandoening te onderzoeken. De wetenschappers…

Marc Koper heeft de Netherlands Catalysis and Chemistry Award ontvangen tijdens de 20e bijeenkomst van de Netherlands' Catalysis and Chemistry Conference. ‘De ultieme kandidaat voor deze prijs’, zo valt te lezen in een van de aanbevelingsbrieven.

Metal-based prodrugs based on ruthenium(II) polypyridyl complexes have proven to be very suitable for application in both photodynamic therapy (PDT) and photo-activated chemotherapy (PACT).

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.

Onderzoekers van het Leiden/Amsterdam Centre for Drug Research en het Netherlands Metabolomics Centre hebben een van ’s werelds kleinste scheidingstechnieken weten te ontwikkelen door nanofluidische en elektrokinetische effecten te combineren. Vorige week verscheen hun onderzoek op de voorkant van het…

Als gevolg van de grote technologische vooruitgang in de gezondheidszorg worden in toenemende mate gegevens verzameld tijdens de uitvoering van klinische onderzoeken.

Quantum hardware comes with a different computing paradigm and new ways to tackle applications. Much effort has to be put into understanding how to leverage this technology to give real-world advantages in areas of interest for industries such as combinatorial optimization or machine learning.

Supramolecular polymers are class of materials that are formed by non-covalent interactions such as hydrogen bonding, π-π interactions, electrostatic interactions and the hydrophobic effect.

Op de vrijwel energieloze bodem van de zee hebben onderzoekers oases gevonden waar micro-organismen toch energie kunnen benutten. Opmerkelijk is dat deze daarvoor eerst 80.000 jaar lang begraven moeten zijn geweest in uiterst karige omstandigheden. Een internationale groep onderzoekers, onder wie José…

Membrane fusion is a vital process in living organisms and is mediated by zipper-like proteins.

This Thesis describes the synthesis of D-alanylated ribitol-based wall teichoic acids from S. aureus to probe their interaction with immune-binding partners.

In order to be able to develop effective medicine and treatments to prevent or cure autoimmune diseases or cancer we need to understand the mechanisms how they arise and what drives their course.Unravelling the fundamental molecular mechanisms influencing the onset and course of diseases such as allergies,…

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.

Dr. Marcellus Ubbink is dit voorjaar bij de Faculteit Wiskunde en Natuurwetenschappen benoemd tot hoogleraar Protein Chemistry. Ubbink kreeg in 2008 een Vici-subsidie van NWO.

The aim of this thesis is to study cell-cell interactions and the development of an assay to explore and quantify the exchange of membrane compounds.

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

Climate change is a challenge for both current and future generations. New biological resources have to be developed in order to meet the demand for energy as well as the demand for food.