In Dutch TV programme Early Birds, Marvin and Kevin Groen (26) showed viewers areas of nature in the city that often go unnoticed. These good-natured brothers - twins, in fact - were a big hit with the viewers. How much influence do they have on one another's studies and work?

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…

Professor Annemarie Meijer and several students explained to more than 8000 visitors the zebrafish as a model for research during the National Weekend of Science (3-4 Oct) at Science Center NEMO in Amsterdam.

How does an embryonic stem cell decide if it becomes a heart cell or a kidney cell? That’s the question computational biologist Maria Mircea studied for her PhD research. She looked at the inside of individual cells to analyse how they change. This is what she discovered.

New and reemerging infectious diseases call for innovative and efficient control strategies of which fast vaccine design and development represent an important element.

PhD defence

Coral reefs throughout the world are under threat. After studying the reefs in Malaysia, Zarinah Waheed concluded that there is room for improvement in coral reef conservation. PhD defence 22 November.

Deze onderzoeksgroep richt zich op het thema ondermijning en financieel-economische criminaliteit, in het bijzonder de aanpak ervan op een aantal deelterreinen.

How do bacteria sense and adapt to their environment? Ariane Briegel, Professor of Ultrastructural Biology, is intrigued by this question. Using new techniques, she produces three-dimensional images of bacteria that provide us with new clues about their sensory system.

Vera van Noort, professor in Computational Systems Biology at the KU Leuven (Belgium), is appointed holder of the rotating chair “Van der Klaauw Professor” for the year 2015-2016 at the Institute of Biology. Holders of the chair bring inspiring research and teaching in theoretical biology to the University.…

How do fats and enzymes in the brain contribute to multiple sclerosis? In his PhD research, Daan van der Vliet combined chemistry and neuroscience to gain new insights into how brain disorders develop.

Using E. coli bacteria to convert a toxic compound in the soil on Mars into oxygen to make life on the planet possible. A team of thirteen Leiden students are taking part in the annual iGEM competition with an entry based on this idea. iGEM is an international competition for students where they use…

Why is it that women less often stand trial for murder or for the planning of a murder than men? Marieke Liem was interviewed by Dutch radio programme ‘Radio EenVandaag’ on 20 November 2018.

Yeast, alpacas, and antibodies. They may seem unrelated, but within the project of the Leiden iGEM students, they come together perfectly. For the international synthetic biology competition iGEM, the team is working on an innovative method to produce nanobodies—a special form of antibodies—using brewer’s…

In a new video series for the Corpus Kids Academy, researchers Marieke Bos and Janna Marie Bas-Hoogendam explain how the adolescent brain develops and how anxiety works. 'We wanted to present the information simply, while still preserving the complexity.'

In an unpredictable environment bacteria evolve the same strategy as shareholders who try to protect themselves against unpredictable swings in the stock market. Experimental evolution biologist Dr Bertus Beaumont published an article on this discovery on 5 November in the journal Nature.

A new technique using fluorescent imaging to track the actions of enzymes might aid drug design for new anti-cancer, inflammation and kidney disease treatments. Researchers at the University of York and Leiden University have published these findings in Nature Chemical Biology.

On December 4th, Flor Rhebergen received the 2015 Unilever Research prize for his study achievements at the IBL for his outstanding work in the field of Evolutionary Biology. Flor Rhebergen received the “Ovum” sculpture and was awarded €2.500.

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.

On 28 February, Marieke Liem, Associate Professor at the Institute of Security and Global Affairs, appeared as a guest on the Dutch NPO Radio 1 Brainwash Podcast to discuss the 'big homicide questions' she is trying to find the answers to.

Leiden University has awarded its prestigious University Medal to Emeritus Professor Lex van der Eb. As a pioneer in genetics and molecular biology, he received this honour for his services to science and his key role in the development of the Leiden Bio Science Park (LBSP).

Even embryos can become embroiled in an evolutionary arms race with another species. Leiden biologists demonstrate this with larvae of the rosy bitterling that parasitize the gills of freshwater mussels. They published their research on February 19 in PNAS.

Leiden University's Pre-University College is celebrating its 20th anniversary. The programme introduced hundreds of secondary school pupils to science and the university. We asked those involved how PRE became so popular: ‘The students are the reason it still exists today.’

Wat weten we over de kinderen die achterblijven na (ex-)partnerdoding? Regisseur Sara Kolster en hoogleraar Marieke Liem sloegen de handen ineen om deze groep slachtoffers in beeld te brengen: met de indrukwekkende documentaire ‘Blauwdruk’ en nieuwe cijfers uit de Femicide Monitor.

The adventure of iGEM Leiden has come to an end. The result: prizes for Best Therapeutic Project and Best Model, a gold medal, a successful crowdfunding campaign and of course their open-source research findings, which are available for the scientific community.

Cyanobacteria are promising microorganisms to advance sustainable biotechnology, since they can be genetically engineered to convert carbon dioxide and light energy into valuable product molecules.

This project, executed by Marieke Hendriksen MA MRes, aims at an analysis of how the early modern anatomical collections of Leiden University were rooted in ideals of perfection in different fields of knowledge and expertise.

Understanding the evolving landscape of extremism in the 21st century.

It has been argued that the Internet presents numerous new opportunities for crime, including homicide. So far, empirical scholarly research in this domain is rather limited. In order to discover how perpetrators have used the Internet in the homicides they have committed, we conducted an international…

What relationships exist between different types of PLCs and cognitive differentiated teaching?

Through this research, we aim to gain a clear understanding of perceptions of safety in Leiden. The results will provide us with information about current perceptions. As Leiden’s City Criminologist Marianne Franken explains: ‘This research really focuses on Leiden’s residents. That’s why want to ask…

These were the main speakers and session leaders at The Knowledge Orchard 2025:

What is the role of stress and stress-related hormones in emotion regulation?

In secondary school, homophobic language is common, even in the Netherlands where there is high acceptance of homosexuality in the adult population. Adolescents especially in lower educational levels have prevailingly negative attitudes towards their lesbian and gay peers. Peer education with its participatory…

The organ in the Great Auditorium in the Academy Building has been played at walk-in concerts and University celebrations since 1998.

Can socioeconomic differences in health behaviour be explained by competing goals and demands in everyday life?

Our team is committed to the study of knowledge in its broadest sense, encompassing both ideas and practices in all its historical variety. We look at what people regarded as knowledge, how they created, collected, circulated and used it, also why it mattered to them, and how all this was embedded in…

Freezing bacteria super fast to gain a true-to-nature image of the internal and external structure. Ariane Briegel Professor of Ultrastructural Biology came to Leiden specially to carry out this research. Leiden University is one of the few institutes in the world to have the necessary equipment. Inaugural…

Farmers on the outskirts of Nairobi National Park protect their livestock using flashing lights on top of the animal enclosures. This system keeps lions away at night. Leiden research has shown that the method is both simple and effective. Publication in PLOS ONE.

If you do research on Leidens Ontzet in Leiden, you can count on a lot of interest. But Leiden Kennisstad interns Marieke Nolten and Alexander Nuijten had not expected there would be quite so much interest. They concluded a year of research with the presentation of a scientific paper.

For years, employees at AAF International in Emmen were exposed to high concentrations of carcinogenic substances. The company has now been taken to court.

’25 years of fatal violence’, a collaboration of dr. Marieke Liem and prof.dr.Lenneke Alink about murder and manslaughter in the Netherlands, has received a research grant by the Leiden University Fund.

As of 1 May 2018, Nicole de Voogd has been appointed as Professor by special appointment Global change and marine ecosystems at the Institute of Environmental Sciences (CML). She is currently senior researcher at Naturalis Biodiversity Center in the field of tropical marine ecosystems.

‘Een goed gesprek begint met iemand écht zien.’ (A good conversation starts with truly seeing someone). That text is written on a plaque that was screwed onto a IK Z1E J3 (I see you) bench on the Wijnhaven Rooftop Garden on Monday morning. The bench acts as a symbol to create room for discussions about…

One used 3D cell models to study colorectal cancer, while the other used machine learning for more efficient blood donation. For these achievements, Marieke Vinkenoog and Simon Christian Hansmann were awarded the Krijn Rietveld Memorial Innovation Award on Tuesday 2 September.