Let A be a commutative algebraic group over a field K, and let G be a finitely generated subgroup of the K-rational points of A. The purpose of this thesis is to study the degrees of the Kummer extensions relative to A,K and G.

To an algebraic curve C over the complex numbers one can associate a non-negative integer g, the genus, as a measure of its complexity.

As a contribution to the changing legislation and evolving societal attitudes concerning environmental issues, this project aims to enhance and manipulate the plants’ own natural defense mechanisms against western flower thrips (WFT).

Marine sponges are important members of reef ecosystems, as they play ecological roles that are essential for the health of the reef.

Fungal food spoilage often starts with a contamination with spores. Experimental data strongly indicate the existence of subpopulations of spores with different levels of resistance to preservation methods.

Traditional drug discovery approaches have been hampered by (in vitro) cell-culture models that poorly represent the situation in the human body.

Vandaag de dag liggen statistische methodes aan de grondslag van beslissingen in allerlei facetten van het leven, van de gezondheidszorg en agricultuur tot de financiële sector en marketing.

Childhood sexual abuse is a common problem, with approximately one in five girls and one in 13 boys worldwide experiencing some form of sexual abuse before the age of 18. Despite its high prevalence, many individuals remain silent about these experiences, often delaying disclosure for years, with one…

The 18th edition of SIP will be organised by Caroline Mueller at the University of Bielefeld, Germany. More information can be found on the SIP 2024 Homepage. The 17th Symposium on Insect-Plant relationships in Leiden has been held online from 25 to the 30 July 2021.

Trigonostemon Blume is a plant genus in the family Euphorbiaceae comprising 59 species.

Promotors: Prof.dr. P.G.L. Klinkhamer, Prof.dr. P.M. Brakefield

Where does the urge to collect come from? What are the explicit or underlying reasons for gathering large amount of objects?

This thesis examines enzyme domain architecture and engineering to improve the breakdown of lignocellulose and starch, abundant biopolymers crucial for sustainable biofuel and biochemical production. Carbohydrate-active enzymes (CAZymes) facilitate this degradation, but the structural complexity of…

Promotor: P. Stevenhagen, Co-promotores: B. de Smit, F. Andreatta

Promotor: Prof.dr. P.C. van Welzen

What does the daily life of those who travelled to Syria to join jihadist groups look like? Destination Syria, a new ISGA report, provides answers to this question

Research on Inclusiveness and Diversity at the Faculty of Science at Leiden University

Promotor: P.G.L. Klinkhamer, Co-Promotores: K. Vrieling, P.P.J. Mulder

Plants and their pollinators form complex interaction networks. Within these networks, species differ widely in the number of species they interact with.

This thesis describes the role of pollution, specifically neonicotinoid insecticides, as an actor of the ongoing biodiversity decline.

Promotor: Prof.dr. P. Stevenhagen, Co-promotor: Prof. dr. B. de Smit

Pre-modern long-distance trade was fraught with risks which often created conflicts of interest. The ensuing disputes and the ways the actors involved dealt with them belong to the field of conflict management.

Organic amendments applied to agricultural fields can partially offset our carbon emissions to the atmosphere and improve the resilience of agriculture to the effects of climate change. Driving these benefits, however, are complex and poorly understood interactions between organic amendment properties,…

As a non-invasive genetic method, eDNA based approaches have become an important component of ecologists' and environmental managers' toolkits for biomonitoring in conservation and an increasingly important source of ecological knowledge.

This thesis pioneers diatom molecular identification and quantification through genome-scale methods, with four key aims: (i) reviewing DNA/RNA sequencing methods in aquatic biomonitoring to highlight their strengths and limitations;

On 10 February 2022, Christian Mommers defended the thesis 'Voluntary return and the limits of individual responsibility in the EU Returns Directive'. The doctoral research was supervised by Prof. P.R. Rodrigues and Prof. P. Boeles.

Migration and Mobility in the Early Roman Empire by Luuk de Ligt and Laurens E. Tacoma (Eds.)

Biodiversity and trade: mitigating the impacts of non-food biomass global supply chains.

The recently introduced nature-originated deep eutectic solvents, so-called natural deep eutectic solvents (NADES) are considered as truly green solvents, which composed of natural ingredients found abundantly in organisms.

The Excellence of the Arabs is a spirited defense of Arab identity—its merits, values, and origins—at a time of political unrest and fragmentation, written by one of the most important scholars of the early Abbasid era.

The Genius of Invective is a peerless example of the breadth, depth, and complexity of the Arabic classical literary tradition. It was once one of the most popular works of Arabic literature, read across all regions from Mauritania to India, from Istanbul to Zanzibar. This volume marks the first English–Arabic…

In this thesis, deep learning is studied from a statistical perspective. Convergence rates for the worst case risk bounds of neural network estimators are obtained in the classification, density estimation and linear regression model.

In this thesis integral points on affine del Pezzo surfaces are studied.

Pectin is a plant cell wall polysaccharide made of mainly D-galacturonic acid (GA) subunits. The potency of the filamentous fungus Aspergillus niger to naturally secrete high amounts of pectinases to degrade pectin has been utilized for the industrial production of pectinases.

In this research we have studied how teaching graphing formulas by hand (i.e. sketching a graph of a formula) could promote grade 11- and 12-students’ symbol sense.

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

The Sport Data Center (SDC) consists of the data science disciplines of Leiden University and Technical University Delft, combined with the sport science branches of the Amsterdam Institute for Sport Science and the Sport Engineering Institute of the Technical University of Delft.

This is an incomplete list of scientific publications by students and staff of the Creative Intelligence & Technology MSc programme.

Leiden University regularly confers honorary doctorates, and presents awards and prizes.

Is private law ready for the challenges of our time?

Creation of a framework for environmental parameter estimation that benefits from the consistency of physics-based theory-driven models and the accuracy of the machine-learning-based data-driven models

Museum Temporalities analyzes how museums relate to time. It explores the hidden temporal assumptions and practices that define museums. How might these assumptions help us to better understand and address museums’ often problematic and painful relationship to the colonial past?

In this article, Marco Cinelli, assistant professor at Leiden University College The Hague, examines proper and improper uses of Multiple Criteria Decision Analysis (MCDA) methods in energy systems analysis.

The unique geographic and temporal breadth of research at Leiden allows us to stimulate a shift from the classical Weberian mode of scholarly production that views historical development and modernization as emanating from Europe and the West to a multi-polar perspective that allows for more nuanced,…