The research of the Applied Mathematics cluster is concerned with such diverse topics as dynamical systems, representation theory, differential equations and pattern recognition.

Leiden is a real student city and has everything you’ll need to turn your time as a student into the time of your life.

Where did species survive the cold cycles of the current Ice Age?

Promotor: W.T. de Groot

Streptomyces are multicellular, Gram-positive bacteria in the phylum of actinobacteria which produce a high amount of bioactive natural products of which the expression is tightly coordinated with the life cycle.

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…

The demand for neodymium-iron-boron (NdFeB) magnets is rapidly growing, while the neodymium supply chain is under pressure. Recycling can alleviate these issues. This thesis investigates the potential for deploying novel magnet recycling technologies and their environmental consequences.

Human civilization consumes a huge amount of fossil fuels, which has resulted in an atmospheric CO2 level which has not been higher in over 800 millennia.

Surface acoustic waves (SAWs) are mechanical waves that travel along the surface of a material and find many applications in modern technologies due to the ease of excitation on piezoelectric substrates via interdigital transducers (IDTs).

Changing burial rites in Early Medieval Northern Gaul, 450-600 CE

Research and design are two activities that are becoming increasingly important in the Dutch subjects O&O (‘research and design’) and NLT ('nature, life and technology’). The dissertation of Tessa Vossen (ICLON and Faculty of Science) indicates that teachers and students understand the importance of…

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,…

Understanding the water use of power production is an important step to both a sustainable energy transition and an improved understanding of water conservation measures. However, there are large differences across the literature that currently present barriers to decision making.

Leiden University is established in two cities: Leiden and The Hague.

Promotores: Prof.dr. P.M. Brakefield, Prof.dr. B.J. Zwaan (Wageningen Universiteit)

Fungal food spoilage often starts with a contamination with spores. Experimental data strongly indicate the existence of subpopulations of spores with different levels of resistance to preservation methods.

The electrochemical oxygen reduction reaction (ORR) is an essential half-reaction for the utilization of hydrogen as a sustainable fuel, via the conversion of hydrogen to electrons and protons facilitated by the ORR. In the most common fuel cells, the ORR is requires high loadings of non-abundant platinum…

Vitamin A or retinol is essential in embryonic development, the visual cycle and the immune system.

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.

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

How did Anglo-Saxons reflect on the experience of growing old? Was it really a golden age for the elderly, as has been suggested?

This work is dedicated to interpreting in cohomological terms the special values of zeta functions of arithmetic schemes.

Leiden Law School has a methods portal that offers an overview of the various phases of empirical legal research.

Leiden is a lively university city, brimming with history and boasting a student life that’s tangible just about everywhere.

The global transition toward low-carbon energy systems and the rapid expansion of digital technologies, including artificial intelligence, are reshaping how modern societies produce, move, and process energy and information.

On 20 January 2022, Marco Stam defended the thesis 'Essays on Welfare Benefits, Employment, and Crime'. The doctoral research was supervised by Prof. M.G. Knoef.

Promotor: Prof.dr. G.P. van Wezel

On 13 October 2021 Ross Spence defended the thesis 'Collateral Transactions and Shadow Banking'. The doctoral research was supervised by Prof. M. Haentjens and Prof. A.M. Pacces (UvA).

On 22 June, Chalermwut Sriporm defended the thesis 'Franchising legal frameworks: a comparative study of the DCFR, US law and Australian law regarding franchise contracts'. The doctoral research was supervised by Jacob Hijma and Iris Houben.

Kuba funerary art from the Congo River Basin

The role of material production as a driver of environmental impacts is increasing, which calls for a better understanding of global material flows. This thesis explores the role of in-use stocks of products, buildings and infrastructure as a key driver of global material demand and discusses the implications…

L1-oral language education is widely regarded as essential for developing communicative competence and critical thinking. However, as a research domain it remains relatively underexplored. The aim of this study was to identify effective elements and challenges within oral language education and to contribute…

We know that armed conflict breeds conflict. We also know the political, economic and demographic factors that inform this repetition of conflict. But we do not understand why accumulated conflict risk factors sometimes do and other times do not pay out in more violence. What if we go beyond macro structural…

How do mycobacteria subvert the defenses of host immune cells?

Not all sustainable business models have the impact they claim, Leiden researcher Levon Amatuni revealed. Car sharing and phone reuse, for example, have a smaller positive effect than previously thought. Amatuni advises people to ‘pay attention to actual changes in their consumption behaviour rather…

Uniting an international consortium of scholars, the Skandapurāṇa Project comprises a team of researchers working in fields across the Humanities. We are creating a critical edition of a foundational work of purāṇic literature and, in doing so, tracing the dynamics of a textual tradition to better understand…

Andrea Evers has received an NWO research talent grant with Jelle van Leusden as the PhD candidate. This grant enables them to start a research project to examine whether automatically regulated responses, such as the circadian rhythm, can be conditioned during sleep.

PhD defence

To be eligible for Research in Bio-Pharmaceutical Sciences at Leiden University, you must meet the following admission requirements.

To be eligible for Bio-Pharmaceutical Sciences and Business Studies at Leiden University, you must meet the following admission requirements.

To be eligible for Bio-Pharmaceutical Sciences and Science Communication and Society at Leiden University, you must meet the following admission requirements.

How can we ensure a more resilient and sustainable supply of Rare Earths in the EU in the future?

When did the Mali Empire disintegrate? What does the Sunjata heritage demonstrate about the political situation after 1600?

Before the large scale use of renewable energy sources can be implemented in our society, the storage of electrical energy needs to be tackled. Storage the energy as hydrogen via the reduction of protons is a good option.

What are the circadian disturbances underlying depression vulnerability? How are they related to mood, cognition and sleep ?