Peak Performance: Collaborative Crisis Management Before and During International Summits. This comparative case study probes into conditions for collaborative governance in the security organisation of international summits.

Sewer pipes are an essential infrastructure in modern society and their proper operation is important for public health. To keep sewer pipes operational as much as possible, periodical inspections for defects are performed.

Focus in skin research

Key publications of the Skin Barrier and Vaccination group.

Promotor: J.A. Bouwstra Co-promotor: A. El Ghalbzouri

Do large deletions represent a risk during CRISP/CAS9-mediated genome editing in plants?

Macromolecular Biochemistry is a section of the Leiden Institute of Chemistry at Leiden University, comprising the PIs Marcellus Ubbink, Remus Dame, Aimee Boyle, Lars Jeuken and Anne Wentink.

Did early farmers deliberately use animal manure on their fields?

Since the adoption of agriculture people have cultivated fields. The project concerns all kinds of aspects related to raising crops.

Projects in the department of Environmental Biology

A special relationship between plants and fungi, which plays an important role in carbon storage in soil, has the potential to slow down climate change. However, the amount of carbon stored in soil is decreasing as a result of human activity. This is what researchers say in a publication in Nature Communications.…

Multi-objective optimization is an effective technique for finding optimal solutions that balance several conflicting objectives. It has been applied in many fields of our world, because practical problems usually have more than one desired goal. For example, developing a new vehicle component might…

The wealth of shoes, sandals and other footwear from ancient Egypt is poorly understood due to lack of research. This is remarkable, because from the very beginning of Egypt’s long history footwear served practical as well as more spiritual purposes.

Promotor: Prof.dr. J. Kuiper, Co-Promotor: S.C.A. de Jager

How do you fit two meters of DNA in a tiny compartment and at the same time are able to access the right parts of it at the right times?

An important feature of atopic eczema (AE) is a decreased skin barrier function. The stratum corneum (SC) lipids - comprised of ceramides (CERs), free fatty acids (FFAs) and cholesterol - fulfill a predominant role in the skin barrier function.

In the fall of 2021, Cleveringa professor Roméo Dallaire and world experts shared their thoughts about PTSD, children’s rights, war crimes, humanitarian law, and peacekeeping in a series of conversations about leadership and moral dilemma during times of conflict and crisis.

Phosphorylation affects all four major biomolecules – proteins, lipids, carbohydrates and nucleic acids – and plays a pivotal role in the most fundamental cellular functions.

Promotor: Prof.dr.ir. T.H. Oosterkamp, N. de Jonge

PhD defence

Following the Beirut explosion, BBC's podcast series The Foodchain explores the chemical that caused the blast: ammonium nitrate. A compound that is widely used to produce fertilizer. Professor of Environmental sustaibability Jan Willem Erisman tells about the effects of nitrogen on the environment.

PhD defence

What are the key issues in conducting LCA of bioenergy systems? What is the environmental sustainability status of second generation bioethanol? How much would the final results of biogenic carbon neutrality assumptions deviate from the true values based on a complete inventory? How to assess the impact…

How can we quantify the density of species within a community through environmental DNA concentrations?

Today’s socio-economic challenges aren’t new. In the centuries after the retreat of the Roman state people with different backgrounds and with different ways of life somehow managed to build and maintain a complex economic system in northern Gaul that would produce the ruling dynasties of Europe. By…

Biodiversity is under pressure worldwide, but is essential for our health, food security and well-being. What is the influence of human actions on ecosystems? Can we provide biodiversity-inclusive solutions for our key societal challenges? These questions are central to the Biodiversity research the…

PhD defence

Supervisor: P.J.J. Hooykaas

The Institute of Biology Leiden (IBL) is an internationally oriented institute for research and education in biology. We are part of the Faculty of Science at Leiden University.

The book ‘Pesticides and the Environment’ gives a transparent overview of facts and figures concerning pesticide use in the Netherlands and the impact of pesticides on the environment.

Food security is challenged by a growing global population and by climate change. Drought and soil salinity are considered the most important ones that inhibit crop yield and distribution. Worryingly, climate change is predicted to increase not only their frequency and severity, but also their co-occurrence,…

Supervisor: P.J.J. Hooykaas Co-Supervisor: R. Offringa

It is well-known that humans have significantly transformed ecosystems since their adoption of agriculture. However, in a deeper past, prehistoric hunter-gatherers may already have altered and modified their niche in ways that had major impacts on ecosystems.

Corrie Bakels & Hans Kamermans (eds) (2009)

The thesis describes terrestrial field trials aimed to detect side-effects of pesticides within the framework of pesticide registration procedures. Field trials were developed using vascular plants Brassica napus and Poa annua, caterpillars Pieris brassicae and effects on decomposition were studied…

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

Mycorrhizas are symbiotic associations between soil fungi and most plant species.

Are you graduating at the Faculty of Science? Or are you supervising a PhD student? At the Graduate School of Science you find support at every phase of your PhD.

Agrian History, 5300 BC - AD 1000; C.C. Bakels

The overall objectives of my thesis are to investigate the dynamics of the sorghum root microbiome and to explore the beneficial effects of the root microbiome on sorghum growth and stress tolerance.

We aim to unravel the molecular mechanisms involved in the transformation of eukaryotic cells by Agrobacterium.

Fieldwork is an essential part of this research and of course this part of the project is also a joint effort by citizen scientists and professional archaeologists. Discover when fieldwork will take place and how you can participate.

Trust in public institutions in the Tata Steel case and beyond

'Skill, craft, and poiesis-intensive innovation' is written by Cristina Grasseni and is published in FormAkademisk.

Paul Hudson, Associate Professor of Physical Geography at Leiden University College, examines human impacts on lowland rivers in his new book.

Microbial Sciences' contribution to the Host-Microbe Interactions research theme is to investigate how beneficial or disease-causing microbes associate and interact with their host.

Mycoheterotrophy is a particular mode of life in which plants obtain carbohydrates from their associated fungal partners, instead of by using photosynthesis.

Mission: The Environmental Biology department aims to increase the scientific understanding of how current and emerging anthropogenic threats affect biodiversity and ecosystem services. Through this understanding they facilitate strategic management of natural resources by addressing urgent challenges…

In late medieval and early modern times, books, as well as the people who produced and read (or listened to) them, moved between regions, social circles, and languages with relative ease. Yet, in the multilingual Low Countries, francophone literature was both internationally mobile and firmly rooted…