Despite being the object of intense study, embryonic development has been difficult to model due to a number of reasons. First, complex tissues can be comprised of many cell types, of which we probably only know a subset.

In this thesis, we describe the potential of cell mechanical phenotyping for immune cell characterization, diagnosis, drug testing, as well as treatment of disease.

During embryonic growth, cells proliferate, differentiate, and collectively migrate to form different tissues at the right position and time in the body.

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.

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…

This thesis advances our understanding of lipid uptake, a vital first step in lipid metabolism, by developing innovative click chemistry-based tools to study how immune cells internalize lipids.

Mechanical interactions between cells and their environment play an important role in many biological processes.

A new type of tripodal squaramide-based supramolecular hydrogels is developed and studied.

Promotor: Prof.dr. J. Kuiper

The deeper understanding of an organism's pathology is important for developing treatments. Over centuries of systematic research, clinical researchers have demonstrated that the more information they acquire about the cellular properties and their organisation in the tissue, the better they can understand…

The aim of this thesis was to study phage infection in Streptomyces, focused on cell wall-deficient cells. Bacteriophages (or phages in short) attach to the cell wall of bacteria after which they replicate and lyse the host cell.

Cell-based medicinal products (CBMPs), such as CAR T cells, are highly complex biopharmaceutical products offering various treatment options for serious illnesses such as cancer or autoimmune diseases.

Cardiovascular disease is a major global burden and atherosclerosis is the main underlying pathological process.

Epithelial-mesenchymal plasticity (EMP) and tumor cell migration play an important role in cancer progression, and an improved understanding of the mechanisms underlying these concepts is essential for developing new targeted approaches.

De master Biology is een samenwerking tussen het Instituut Biologie Leiden, Naturalis en het Centrum voor Milieuwetenschappen Leiden waardoor het programma een brede en diverse scope heeft. De opleiding biedt zeven specialisaties, waarvan vier researchspecialisaties die nauw verbonden zijn met het onderzoek…

Quantitative biology means exploiting mathematical modelling and computer simulation as a tool to gain additional insights into the meaning of experimental data. Discover in this minor when and how to apply these tools, in a multidisciplinary setting.

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…

Promotores: H.S. Overkleeft, G.A. van der Marel, Co-Promotor: R.G. Boot

De afdeling richt zich op het verbeteren van het wetenschappelijk begrip in de relatie tussen mens en natuur. Hoe beïnvloedt menselijk handelen (via bijvoorbeeld klimaatverandering, landgebruiksverandering en de emissie van mogelijk toxische verbindingen) de natuur in het algemeen en de biodiversiteit…

Het chemische biologie-onderzoek bij het Leids Instituut voor Chemisch Onderzoek (LIC) is gericht op het begrijpen van biologische processen op moleculair niveau, om zo onze kennis te vergroten over gezondheid en ziekte van de mens.

Almost all bacteria are enveloped by a cell wall that provides cellular protection.

This thesis describes the design and synthesis of fragments of various cell wall carbohydrates of the Streptococcus species, including the branched Group B-specific antigen (GBC) of Group B Streptococcus, glycerol phosphate (GroP) modified group A carbohydrate (GAC), and the O-acetylated type 1 capsular…

Aspergillus niger is an important industrial producer of organic acids and enzymes producing large amounts of spent fungal biomass.

In this project of the Center for Public Values & Ethics (CPVE) ongoing research is conducted on the history of advice to Dutch central government by so-called State committees from 1814 to 2014. State committees have been installed by Dutch central government since 1814 to provide expert advice, research…

In deze opleiding identificeer je evolutionaire veranderingen over de tijd en bestudeer je de oorsprong en het behoud van biologische variatie in de Tree of Life.

Na afronding van deze opleiding beschik je over een eerstegraads onderwijsbevoegdheid en ben je goed voorbereid op een carrière als docent Biologie in het voortgezet onderwijs.

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…

Acute cardiovascular syndromes, including myocardial infarction or stroke, are the principal cause of death in the Western society. The main underlying pathology of cardiovascular diseases is atherosclerosis, which is caused by the accumulation of lipids and inflammatory cells in the vessel wall, in…

Traditional drug discovery approaches have been hampered by (in vitro) cell-culture models that poorly represent the situation in the human body.

In this research project, we aimed to obtain more insight in the role of mast cells in the immune driven disorders rheumatoid arthritis and atherosclerosis.

In this thesis, we have studied cell images from two types of cells, including pollen grains and the immune cells, neutrophils. These images are captured using a bright field microscope and a confocal microscope.

This thesis focuses on two processes involved in fighting infections: metabolism and immune cell motility and navigation.

Cytotoxic T-cells (CTLs) are involved in the clearance of viruses and killing of tumor cells.

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.

Deze opleiding biedt de mogelijkheid om biologie-onderzoek te combineren met kennis over ondernemerschap en ervaring in het bedrijfsleven.

The bacterial cell wall is a nearly universal structure that offers protection and gives the cell its shape. However, environmental stressors, such as cell wall-targeting antibiotics and hyperosmotic conditions, can induce bacteria to shift to a wall-deficient state. It is unknown whether the lack of…

This dissertation is organised into three parts, each addressing a distinct research area related to Gibbs measures.

This thesis describes the antimicrobial discovery strategy developed in our group, the den Hertog Group at the Hubrecht Institute. It includes a cultivation-based screening approach for novel antimicrobial agents from the source of fungi, and a bacterial time-lapse imaging approach for antimicrobial…

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

CONCLUSION: This study demonstrates that human macrophages can be induced to exert direct anti-tumor activity against osteosarcoma cells. Our observation that the induction of macrophage anti-tumor activity by L-MTP-PE required IFN-gamma may be of relevance for the optimization of L-MTP-PE therapy in…

The way organisms develop from the initial single-cellular state to a complex final assembly like the human body, and how the final body is maintained throughout life, is one of the greatest mysteries and it’s understanding one of the biggest scientific challenges.

In deze opleiding ligt de focus op het informeren van het algemene publiek over belangrijke wetenschappelijke onderwerpen en hoe je deze communicatie wetenschappelijk onderbouwt.

In order to gain a better insight into the basis of the rapid jasmonic acid (JA)-mediated stress response, an integrated approach using a targeted high-resolution mass spectrometry-based (HRMS) platform, was conducted to monitor the metabolism of JA using the model system of cell suspension cultures…

Deze opleiding biedt de mogelijkheid om onderzoek op moleculair, cellulair en organismaal niveau te verenigen, maar biedt ook de mogelijkheid om je te specialiseren op één van deze niveaus.

Onder de gezamenlijke titel ‘Scarcity and the State’ verschenen onlangs twee Engelstalige boeken over de verdeling van schaarse publieke rechten (Intersentia 2016). Paul Adriaanse (UL), Frank van Ommeren (VU), Willemien den Ouden (UL) en Johan Wolswinkel (Tilburg University) voerden de redactie. Aan…

Dit artikel onderzoekt hoe tijdelijke coalities van niet-statelijke actoren deelnemen aan internationale onderhandelingen over milieuvraagstukken.

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

Balsaminaceae is a diverse plant family characterized by a huge floral morphological diversity.

De lezingreeks Humanity in the Automated State Jaar 2025/2026 onderzoekt hoe AI en geautomatiseerde systemen de overheid en publieke administratie transformeren en wat het betekent om mens te zijn binnen deze gedigitaliseerde instituties.