‘The climate crisis is the greatest threat we face,’ says Leiden University environmental scientist Paul Behrens. ‘And yet, there is hope. In the near future, I think we will wonder why we didn’t make these changes earlier.’

Maurijn van der Zee searches for insecticides that protect crops without harming wildlife or leaving residues in our food. His GREENSHIELD project received funding from the NWO Open Technology Programme.

Directing soil life and thereby influencing what grows above ground: that is the expertise of Leiden biologist Martijn Bezemer and his colleague Wim van der Putten (NIOO-KNAW). Their research on soil transplants has been nominated for the Huibregtsen Prize 2023. This prize goes to innovative research…

Sterre ter Haar has won the Rachel Carson Graduation Prize for her thesis on how rising levels of CO₂ affect the nutrient content of plants. For the Industrial Ecology student, the award is a crowning achievement after a difficult period of recovering from long COVID.

Playgrounds often fail to accommodate children with autism, according to researchers Carolien Rieffe and colleagues. They have published an essay offering practical advice on how to make all children feel safe and welcome for Autism Week (Dutch) and World Autism Autism Awareness/ Acceptance Day on 2…

You may already have seen them in the larger restaurants in the teaching buildings: simple yet tasty hagelslag or cheese sandwiches. Students asked and the University Services Department (UFB) has delivered with its new Pure Basic line. Now there is a lunch for every budget.

No less than four Leiden research teams have been awarded a grant by NWO. On 27 July NWO honoured 21 applications in the Open Competition ENW-XL. NWO awards the grants to consortia in the exact and natural sciences who are doing unconnected fundamental research that is 'driven by curiosity'.

Imagine scanning lion dung or a mouse dropping and instantly knowing exactly what and how much the animal has eaten. Thanks to new DNA techniques, this is becoming increasingly feasible. PhD student Kevin Groen tested how effective these techniques are at unraveling the diets of wild animals.

After hard work in the lab, Chemist Tirong Guo has developed a group of materials that provide a stable and efficient foundation for artificial photosynthesis. Will this enable the large-scale production of hydrogen and other useful compounds in the most sustainable way possible? Guo will defend her…

An evolutionary 'trap' that has haunted crested and marbled newts for 25 million years: Leiden researchers have uncovered a mysterious DNA error that should not be able to arise – yet persists all the same. How is that possible? PhD candidate James France found new clues.

For a long time, Thijs Bosker was an average student, until he discovered how exciting learning becomes when there are no ready-made answers. To his students, he passes on one key message: hope is the driving force that keeps us moving forward. They nominated him as Lecturer of the Year.

Hortus prefect Paul Keßler was a part of the delegation of Leiden researchers that traveled to Indonesia on a knowledge mission. In two weeks, he visited seven different universities and institutes and of course he also went to see three botanical gardens.

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Organisation

Give organisms like plants and animals the freedom to move, interact and meet their own needs, and they will thrive on their own, says Professor Geert de Snoo. Our interference often ends up doing more harm than good.

Joey Zuijdervelt

The environmental risks of new pesticides containing nanoparticles are inadequately researched, according to four Leiden scientists in the scientific journal Environmental Science & Technology. They call for an examination of the long-term and environmental effects of pesticides containing nanoparti…

On 22 May, astronaut André Kuipers opened the new Mediterranean garden in the Hortus. With this water-efficient garden, the Hortus aims to offer inspiration for future- and climate-proof garden planting. Prefect Paul Keßler and scientific director of the Leiden Observatory Ignas Snellen also signed…

In a new study published in PLOS One, Leiden archaeologist Anastasia Nikulina, together with an international team from France, Denmark, the United Kingdom and the Netherlands, challenges the long-held belief that early humans had minimal impact on their environment before the rise of farming.

Researchers at Leiden University have been awarded a €4 million EU grant to develop climate-neutral fuels. With this money they will expand the broad research community that focuses on green energy. If we work together, we can make the rapid progress that is needed, says Prof. Huub de Groot, Professor…

On 17 June, primary school pupils in Leiden will get the chance to explore science in an interactive and engaging way. The exciting new show ‘Wetenschapswonders’ is the initiative of master’s students Boele Visser and Ilse Hordijk, from the Rino Foundation. ‘I’m happy to help build a bridge between…

A new government, conflicts around the world and obviously a lot of science: these are the five stories about Leiden University that you enjoyed reading in 2024.

Microorganisms that temporarily ‘go to sleep’ play an important role in the evolution and survival of a population. Mathematician Shubhamoy Nandan conducted research on the effect of this characteristic called ‘dormancy’ in a novel mathematical model.

Una Europa, an alliance of 11 top European universities, provides annual seed funding for new research and teaching projects. Assistant Professor Carmen van den Bergh applied for funding with her Flemish and Italian counterparts. Thanks to this funding and the support of Erasmus+, students can now take…

Whales in the vicinity of the city of Auckland, New Zealand consume large amounts of microplastics every day. A team of international researchers reached this conclusion after carefully examining whale poop. The team included Thijs Bosker, Associate Professor in Environmental Sciences at Leiden University…

PhD candidate Ludwig Hoffmann will spend two years at Harvard University in the US thanks to a Rubicon grant he won on April 11. Using theoretical models he studies biological tissues, for example during morphogenesis. This is the process that causes tissue or organisms to develop their shape. ‘This…

Education

After three years of covid postponements, the time had finally come on Wednesday 29 June 2022: Carel Stolker’s last speech as Rector Magnificus was buried according to tradition under the ginkgo tree in the library at the Kamerlingh Onnes building.

Organisation

Research

Annetje Ottow is the first female president of the Executive Board of Leiden University, which means a return to her Alma mater.

Research

To facilitate the search for new antibiotics. That is the aim of Gilles van Wezel, professor molecular biotechnology at the Institute of Biology Leiden (IBL). He wants to do this by looking at similarities in the DNA of antibiotic-producing bacteria. Van Wezel has been awarded an ERC Advanced grant…

Paco Barona Gomez is the newest associate professor at the Institute of Biology Leiden (IBL). The Mexican researcher is fascinated by the evolution of natural products: compounds made by microbes, but also plants and animals. ‘It’s like we investigate chemical dark matter.’

Netherlands and China can learn from each other to handle household and livestock wastewater more sensibly. In the FOREWARD project, scientists from Leiden, Wageningen, and China are working together with local partners on feasible solutions that advance the environment, health, and economy.

Cotton is the most widely used natural fibre for clothes. But how polluting are our jeans and shirts actually? Environmental scientist Laura Scherer coordinated an international research project on the impacts of cotton. ‘The purchases of consumers in Europe can contribute to water scarcity in China…

A huge shiny aluminium object stands in the middle of the Polderlab in Oud Ade. Are the researchers trying to make contact with extraterrestrial life? Certainly not; they are using the ’Moon landers’ to measure whether innovative forms of agriculture reduce greenhouse gas emissions. Fleur van Duin works…

A lot of municipalities work with a points system to encourage construction projects to take biodiversity and creating green areas into account. But this way of working also benefits local neighbourhoods and residents, master's student Marije Sesink discovered. She based her study on The Hague.

Leiden University is celebrating its 450th anniversary in 2025 with a feast for the eyes, ears and spirit. The anniversary year opens with an extra special Dies Natalis on 7 February. Highlights includes an alumni festival, three exhibitions and a canal concert.

Connecting worlds, enhancing research and teaching, and providing innovative solutions to complex social issues: that is the idea behind interdisciplinary research. In that respect, a huge amount happened at Leiden University in 2023.

Interest groups seem to be going to court more often to force politicians to act. How often do they do so? And how successful are they? The Kiem project ‘Litigation in the name of public interest’ is compiling a database on this.

Over 30 ambassadors strengthened their ties with researchers and university leaders in a recent visit to Leiden University. Cross-border collaboration (both literal and figurative) was the theme of presentations and a tour of the Hortus botanicus.

When do we define a piece of nature in the city as a park? And when is something a tree or shrub? It may seem obvious, but in scientific literature the definitions vary quite a bit. That makes comparisons difficult. Environmental scientist Joeri Morpurgo looked at the differences and designed a general…

With a self-converted red camper van, biologists and twin brothers Kevin and Marvin Groen go on a nature adventure in Eastern Europe. Together, they search for wild animals, beautiful nature and places to sport. From a long search for a bear in the Slovakian wilderness to the discovery that pelicans…