Promotor: G.F.A. Kersten, W. Jiskoot, Co-promotor: B. Metz

How dangerous are micro- and nanoplastics? Do they affect the environment? What harm can they do to our bodies? Questions that we can now finally answer because of Fazel Abdolahpur Monikh. Together with his colleagues, he developed a method to detect and quantify nano-sized plastics. Their paper has…

Plastic cigarette filters are a major source of litter and microplastics pollution. Legal experts from Leiden University, commissioned by a Dutch ministry, examined policy options to reduce this pollution and whether a national ban is legally feasible.

From where litter ends up to which languages are spoken in Leiden and The Hague: over 50 interesting, surprising, complex and entertaining questions were sent in for the Citizen Science project to mark our 444th anniversary. Not one but two Citizen Science projects will be starting this year in Leiden…

Plead

Leiden Law School is working hard to improve sustainability both in education and teaching within the faculty, at our campus and in our research. You can read all about the university's vision and ambitions, recent developments in this area, our current sustainability projects and how students and…

What is the effect of pesticides, fertilizers or plastic on water quality? And how do wind and rain affect the data? These are just some of the things that Leiden environmental scientists study in the 32 ditches of the Living Lab.

Have you spotted the special voting bins on campus yet? Send us your suggestions for challenging, non-scientific questions and who knows? Your burning question might just be the next butt-kicker!

Key publications of the Aging and Immunity group

The Astronomy and Instrumentation specialisation consists of 120 European Credit Transfer System (EC) points and includes highly specialized instrumentation courses, a selection of advanced electives and two research projects.

The main goal of the THEOR CHEM group, headed by Prof. Geert-Jan Kroes, is to characterize, and to accurately predict the outcome of chemical reactions at gas-solid and liquid-solid interfaces. Here the solid surface is typically a metal or an ice surface. These goals are important to many areas in…

duurzaamheidsthema's onderzoek

The European University for Well-Being is organising a hackathon from 14 to 21 September to generate concrete proposals for this virtual university and to create a EUniWell identity. Leiden students and staff are welcome to take part.

Lecture

The opening of the Academic Year 2017-2018 took place on Monday 4 September 2017 in Pieterskerk church.

This article aims to contribute to the debate about citizen involvement in medical and social issues by studying co-production initiatives in The Hague.

This research investigates the changing landscape and land use in two case studies of the coastal villages of St. Kitts and the Kalinago Territory of Dominica. By integrating human and ecological aspects of agrarian landscapes, this research analyzes how land degradation or land change impacts cultural…

This thesis reports on the influence of induction programs on beginning teachers’ well-being and professional development, and the essential characteristics of an induction program. These topics were explored by means of an interview study and large scale survey study.

Student well-being is more important than ever and is high on Leiden University’s agenda. There are many recent new initiatives, such as Well-Being Week and POPcorner The Hague. To streamline all these new initiatives and create new student well-being activities, a Student Well-Being Officer has recently…

Our institute contributes to multiple curricula. 

Occupational health in the Emergency Department

New technology offers many new possibilities for research, such as on dementia. ‘Organ-on-a-chip’ is a new technology in which small bits of organ are grown out of stem cells on a small plastic plate. A small piece of blood vessel, heart or nerve offers many new possibilities for research, such as…

Leiden University's Citizen Science Lab supports and organizes initiatives where anyone can get started with scientific data and research. This is how we enrich research with insights from the community, make science accessible to all, and tackle important local issues together.

Netwerk en projecten duurzaamheid verduurzaming green office en green team

Lets hit the water! Our students joined us on Saturday 30 August 2025 for a Stand Up Paddleboarding (SUP) and canal clean-up session on Leiden’s canals with Plastic Soup Surfer Merijn Tinga.

In this project, the hypothesis that language contact crucially impacts the development of spatial grammar and phonology is investigated.

This dissertation provides a thorough review of the words belonging to the oldest layer of Germanic loanwords in Proto-Slavic and answers the question of how these words were adapted to the Proto-Slavic accentual system.

The Covid pandemic has had a considerable impact on academics’ work and well-being. They have had much less time to spend on their research. The Young Academy and the Dutch Network of Women Professors have conducted research into how the situation has been for academics. The two organisations have recommendations…

Apprentices in the art of debate: that is the best description of the group of secondary-school pupils from Pre-University College who battled it out with each other and European parliamentary candidates on 29 March. The fitting location was Huis van Europa in The Hague.

Product packaging is essential. It prolongs shelf-live and highly influences purchasing decisions. However, it’s also a big source of waste, especially single-use plastic. Have you ever felt conflicted choosing a product due to the material it’s packaged in? Or opted for a different product due to its…

Western thought has often dismissed shadows as fictional, but what if fictions reveal original truths?

Diacylglycerol lipases (DAGLα and DAGLβ) convert diacylglycerol to the endocannabinoid 2-arachidonoylglycerol. Our understanding of DAGL function has been hindered by a lack of chemical probes that can perturb these enzymes in vivo.

Leiden University and four other parties have signed a declaration in which they agree to improve the well-being of students in Leiden. They signed this Declaration on Student Well-Being on 5 April at the Leidsch Besturendiner, a dinner for student associations, universities, local government and bu…

How do public organizations use strategic regulatory communication in regulatory governance?

This dissertation concerns the role of analogy in Kant’s “Critique of the Teleological Power of Judgment”, especially the role of analogy for the formation of the concept of a natural end (Naturzweck). A ‘natural end’ is a ‘regulative concept’ of the reflective power of judgment, that is, a heuristic…

It’s Not Easy Being Green – but we’re here to help! Listen via the link in our bio! Do you want to live more sustainably but have no idea where to start? Are you interested in making the world greener and do you want to get to the bottom of hot topics? Or are you sceptical about climate change and…

We know from national and international research that many students struggle with psychological problems. How about students in Leiden? Leiden University's Student Well-being Taskforce wants to see more research and has also come up with some advice, ranging from personal buddies and digital support…

Adoptees in the Netherlands generally do not use more medication than their non-adopted peers.

Learning from nature and utilizing microbial biodiversity to identify and characterize enzymes for degradation and upcycling of plastics and other polymeric materials.

LACDR is committed to incorporating sustainability into our education and research. By developing environmentally responsible innovations in drug research, promoting the awareness of the importance of sustainability with LACDR staff and students, and implementing sustainable daily practices within our…

The earth has more than 7 billion inhabitants, all of whom leave behind traces of pollution. However, not all forms of pollution have the same harmful effect. Leiden scientists help determine where we should put our priorities.

How to keep 80 students with different backgrounds motivated for 3 hours? Stefano Cucurachi knows how! By incorporating current developments, lively discussions and even some improvisation theatre, this assistant professor managed to become Teacher of the Year 2018. ‘You have to find ways of gaining…