What does European border security look like? On 14 April, Hans Leijtens, executive director of Frontex and former commander of the Royal Netherlands Marechaussee, is in The Hague for a lunch lecture. We spoke with him about border security, migration and the role of Frontex.

Castles, monasteries and bridges, but also city profiles, history prints and water management works. Leiden University Libraries (UBL) manages one of the most important collections of topographical images in the Netherlands. The collection, bequested to UBL by Johannes Tiberius Bodel Nijenhuis (1797-1872)…

Lecture, Book Presentation

An international team of astronomers led by Ardjan Sturm of the Observatory has made the first two-dimensional inventory of ice in a planet-forming disk of dust and gas surrounding a young star. The researches, including Melissa McClure, used the James Webb Space Telescope and publish their findings…

VVI Research Meetings 2023-2024

The new Cluster Zuid building is progressing steadily. The glass roof over the atrium has been installed and the window frames are being fitted. The future locations of the offices and classrooms are also becoming increasingly visible. See Stijn Poelstra's photo report below.

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…

Marjolein van Reisen has been Institute Manager Finance for a year, and Wiesje Zikkenheiner has been Institute Manager HR for two months. This duo job is by no means a luxury in an ever-growing organisation. Marjolein: 'We’re both new to this world, so we have our hands full.'

Should we be growing rice and building materials instead of grass for cows? From invasive crayfish to cultural heritage and groundwater levels: ten graduating students explored the future of the Groene Hart, the rural region just outside the cities of Delft, Rotterdam and Leiden where they study.

Micro- and nanoplastics cause stress to crops such as lettuce and carrots, PhD candidate Laura Julia Zantis found. This can lead to reduced growth and a lower nutritional value. Biodegradable plastics have this effect too, likely because of chemicals they release during degradation.

You can apply various means to increase your societal impact: through interaction with professionals, the commercial sector or general audiences. The University can support you in this process in a number of ways.

Third-year cultural anthropology student Claire van Helder (24) says she can't be kept still. She has her own blog, is active on Instagram and recently started a YouTube channel. She is a member of the student party LVS, elected to the faculty council and will become the president of WDO in September.…

In zoos, at festivals and in a mobile lab at the market: everywhere, Mariska Kret tries to understand human and animal emotions with her distinctive behavioural research. Now she has received the Mercator Sapiens Stimulus of €1 million for her efforts.

Hydrogen can help to solve the climate problem. At least, if we start producing it in the right, clean way. Leiden researchers mapped out the global environmental impact of hydrogen production and looked ahead to 2050. They published their work in Energy & Environmental Science.

Since the opening of the SSH labs in the Sylvius Building, more and more researchers are starting in the state-of-the-art lab spaces. What research are they doing, and how do they like the new facilities? Read about their experiences.

PhD defence

PhD defence

Lecture

Exercising less, skipping parties and struggling at work: the expectation of chronic pain and itching can lead to avoidance behaviour. But this is by no means the case for everyone with chronic pain, as PhD candidate Gita Nadinda discovered. What does this mean for healthcare?

In an essay Professors Jan Willem Erisman (Leiden University), Chris Backes (Utrecht University) and Wim de Vries (Wageningen University) suggest amending nitrogen policy in the Netherlands. They call for a shift from a deposition to an emissions policy, with sectors responsible for reducing their own…

FSW building, Wassenaarseweg 52, 2333 AK, Leiden

Organisation, Research

With his clever measuring methods Ignas Snellen – together with his team – was the first to detect carbon monoxide in the atmosphere of exoplanets. For his pioneering work the Leiden astrophysicist has been awarded the Spinoza Prize, the highest academic honour in the Netherlands. The prize of 2.5 million…

A group of astronomers led by Leiden PhD student Sebastian Zieba has discovered using the James Webb Space Telescope (JWST) that the rocky exoplanet TRAPPIST-1 c has a thin atmosphere. Although the planet is nearly identical to Venus in size and temperature, and was expected to have a thick atmosphere,…

Through various initiatives, Leiden University is trying to make people aware of the importance of biodiversity: the cultivation of a wide variety of micro-organisms, animals and plant species. This is important because in the Netherlands biodiversity has declined from about 40 percent in 1900 to about…

Course, Workshop

The sustainable production of hydrogen could potentially be made more efficient by adding a cleverly chosen salt to the process. Researchers at the Leiden Institute of Chemistry (LIC), in collaboration with physicists at the University of Twente, have discovered that the type of salt present in the…