This thesis aimed to investigate the impact of exposure dynamics, relative contributions of ENPs(particle) and ENPs(ion), and dosing regimens on the toxicity of ENPs varying in different physico-chemical properties, on the composition and functioning of soil microbial communities.

As a virtually inexhaustible source, solar energy plays a major role in future global energy scenarios.

Synthetic hydrogels that mimic the natural extracellular matrix in the biophysical and biochemical cues it provides to cells are in high demand, however the cell phenotypes as they are observed in vivo in numerous cases have yet to be attained.

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,…

The majority (80%) of e-waste generated globally are recycled informally in developing countries.

Promotor: H.S. Overkleeft, J. Neefjes, Co-promotor: M. van der Stelt

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

Promotor: G.P. van Wezel, Co-promotor: Y.H. Choi

Over several decades, a variety of computational methods for drug discovery have been proposed and applied in practice. With the accumulation of data and the development of machine learning methods, computational drug design methods have gradually shifted to a new paradigm, i.e. deep learning methods…

Promotores: Prof.dr. H.S. Overkleeft, Prof.dr. G.A. van der Marel

Wat een tijd, geld en ongemak zou dat schelen: behandeling op maat voor elke patiënt. Zulke precisiegeneeskunde komt steeds dichterbij, mede dankzij de algoritmen van Elise Dusseldorp. Die halen een schat aan informatie uit onderzoeksdata.

Cursus

Hoe is het om te werken bij de Universiteit Leiden en hoe zijn wij als werkgever? Diverse medewerkers delen graag hun ervaringen. Bekijk de video’s.

Neuraminidases are enzymes that cleave glycosidic linkages of sialic acid. These enzymes are involved in influenza infections as well as in many cellular processes in mammals and micro-organisms.

Cyclic peptides are investigated as a platform to induce different orientations between various ligands.

Evolution acts via mutations in amino acid sequences. Substitution of essential amino acids leads to a nonfunctional protein. l.

The thesis explores how interstellar chemistry evolves as a function of time and changing physical architectures during the formation of stars.

Nicotinamide adenine dinucleotide (NAD+) is the substrate used for the introduction of the ubiquitous and highly dynamic PTM in which either one or multiple adenosine diphosphate ribose (ADPr) moieties are covalently attached to a nucleophilic side chain of an specific amino acid in the target protein…

Promotor: Prof.dr. M. Ubbink, Co-promotor: G. Siegal

Hoe is het om te werken bij de Universiteit Leiden en hoe zijn wij als werkgever? Diverse medewerkers delen graag hun ervaringen. Bekijk de video’s.

Duaal promoveren Werken en promoveren Promoveren in deeltijd Promoveren naast je werk Buitenpromovendi Buitenpromovendus Buitenpromotie Part-time promoveren Part-time promotie Part-time promotie Promoveren naast je werk Promoveren naast mijn werk

In het online college bij de Universiteit van Nederland vertelt chemicus Marjolein Soethoudt of je de volgende keer dat je hoofdpijn hebt beter een jointje kan roken… of juist niet. Verder legt ze uit wat de zoektocht naar synthetische cannabis zo moeilijk maakt, en voor welke ziektes dit allemaal een…

Endocannabinoids are lipid messengers that modulate various physiological functions by activating the cannabinoid CB1 and CB2 receptors. While the metabolism of endocannabinoids and their action at the CB receptors is fairly well studied, the molecular mechanisms governing their release and transport…

This dissertation aims to advance understanding of amoeboid single cell migration under the influence of changing physicochemical environmental properties. The particular focus is on the relatively unknown influence of differing physical properties in the extracellular environment, such as the migratory…

The research described in this thesis combines the latest insights in lysosomal function with lysosome centred cell signalling.

Promotor: G. J. Kroes

We showed that constitutive and inducible chemical and morphological defenses against Western flower thrips differ between tomato and chrysanthemum plants.

This dissertation contains four works during my PhD. Different biomaterials have been designed based on coiled-coil peptides. These biomaterials have a range of applications, inclusing drug delivery, cell sorting to cell-cell fusion.

The primary goal of this research is to deepen our understanding of substrate-enzyme interactions in Glycoside hydrolases. For this purpose, Bacillus circulans xylanase (BcX) has been selected as a well-established model to examine the Michaelis complex and glycosyl-enzyme adduct.

In the past decade many population studies have been performed with the Atacama Large Millimeter/submillimeter Array (ALMA) to understand the bulk properties of protoplanetary disks around young stars. These population studies mostly consisted of low mass stars, with relatively few of the disks around…

The research presented in this thesis explores the chemotherapeutic potential of metal-based compounds as chemotherapy agents, with an initial focus on the synthesis and DNA interaction studies of platinum and palladium compounds utilizing the [Pt(bapbpy)]2+ scaffold. The study identifies intercalation…

Nature uses a special class of histone proteins, histone variants, to modulate the properties of chromatin at defined genomic locations.

This thesis combines field and laboratory studies to address some of the most pressing questions in the field of microplastic research.

Promotors: Prof.dr. E. Bouwman, Prof.dr. E. Drent

Promotor: H.S. Overkleeft, Co-promotor: M. van der Stelt

Carbohydrates are present on the surface of bacteria making them suitable antigen candidates for vaccine development. This thesis deals with the synthesis of two carbohydrate-based components; the capsular polisaccharide of S. aureus type 5 and teichoic acids from staphilococci and enterococci speci…

Dissociative chemisorption is an important reaction step in many catalytic reactions.

In this thesis chemical and physical processes in the ice mantles on interstellar dust grains are studied.

The main goal of this thesis is to achieve advanced control of binding properties in bis-pyrrolic and macrocyclic pyrrolic receptors by light.

Promotor: Prof.dr. G.A. van der Marel, Co-Promotor: J.D.C. Codée

Promotores: Prof.dr. H.S. Overkleeft, Prof.dr. G.A. van der Marel

With an emphasis on developing novel miktoarm star polymers termed PeptoMiktoStars, this thesis leverages asymmetric polymeric polypept(o)ide frameworks to advance their effectiveness in delivering hydrophobic drugs and nucleic acids.

Promotor: Prof.dr. M. Ubbink

This thesis introduces the concept of

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.

Promotor: Prof.dr. E.F. van Dishoeck, Co-Promotor: G.J. Herczeg

A structural investigation of coiled coil peptides used as membrane fusogens, mimicing naturally occuring coiled-coil fusion proteins. Synthetic modifications have been made to alter lipid attachment, secondary structure and to insert photoactive azobenzene moieties for active control over coiled coil…

This thesis explores squaramide-based supramolecular polymers and hydrogels, enhancing their mechanical strength for 3D cell culture.

There is a need for alternative methods to replace, reduce and refine (3R) animal experimentation. Combining experimental data from high-throughput in vitro studies with in silico modeling is a promising approach to unravel the effect of chemicals on living cells and to gain a better understanding of…

Dit proefschrift beschrijft een collectie aan alternatieve strategieën voor het begrijpen, ontwerpen en toepassen van lipide nanosystemen, waarin de rol van de bio-nano interacties centraal staan. In het bijzonder wordt gekeken naar de interactie van RNA-lipide nanosystemen, bekend van de toepassing…