Natural resources often stretch across borders that separate modern nation states. This can create conflict and limit opportunities for regulated consumption of their goods and services, but also provide opportunities for joint multinational efforts that exceed single country capabilities.

In my research, we developed a method to distinguish knots. A knot is a mathematical depiction of the everyday knot that occurs in ropes and cords.

Is dat appje bot of juist vriendelijke bedoeld? In geschreven taal ligt een misinterpretatie altijd op de loer. Universitair docent Lauren Fonteyn legt in Trouw uit hoe dit komt.

Promotor: Prof.dr. P. Stevenhagen, Prof.dr. K. Belabas (Univ. de Bordeaux)

Promotor: Prof.dr. B. van de Water

There is concern about the threat that nanoplastics (NPs) may pose to both wildlife and humans. This thesis explores the mechanisms of toxicity of polystyrene nanoparticles (PS-NPs) in chicken embryo.

This thesis describes the functional analysis of the Arabidopsis AHL15 gene.

Azië en Europa hebben in toenemende mate met elkaar te maken. Om een duurzame samenwerking te bevorderen is het belangrijk elkaar op economisch, sociaal-cultureel, historisch, en juridisch gebied beter te begrijpen. Leidse wetenschappers leveren al decennia een belangrijke bijdrage aan de verwerving…

The complexity of an intelligence problem determines to a great extent the certainty that can be provided by intelligence and security services.

Promotor: P.M. Brakefield

In this thesis we study the moduli space of genus g curves, and the differential forms that occur naturally on this moduli space.

Promotores: Prof.dr. H Lenstra, Prof.dr. A Facchini (Padova University)

Promotor: Christoph U. Keller, Co-promotores: Matthew A. Kenworthy, Frans Snik

This thesis is is made of three parts. The first part describes a generalization of the Chabauty's method, that can be used to determine the rational points of a curve such that s+g>r+1, where g is the genusof the curve, r is the rank of the Mordell-Weil group of the jacobian of the curve and s is…

In astronomy, the interpration of observations and measurements plays a crucial role: we rely purely and fundamentally on the information that reaches us as observers. And 80% of all matter in the universe is undetectable directly.

Promotor: S.M. Verduyn Lunel

Promotores: R. Cramer, A.K. Lenstra, Co-Promotor: B.M.M. de Weger

Multiple stars, that is two or more stars composing a gravitationally bound system, are common in the universe.

Drug development is a time- and resource-consuming process that starts with the discovery and validation of a (protein) target that contributes to pathogenesis or disease progression.

Promotor: Prof.dr. E.F. Smets. Co-promotores: B. Gravendeel, F. Pupulin

Promotor: J. Zaanen, Co-Promotor: V. Juricic

Streptomyces are filamentous bacteria that produce more than two-thirds of known antibiotics.

This thesis deals with properties of Jacobians of genus two curves that cover elliptic curves.

Stars like the sun are born in large molecular clouds existing from gas and dust. During the formation process, the chemical composition of the material can be altered drastically by the changing physical conditions.

CREEA is a FP7 project on compiling and refining environmental and economic accounts. The project runs from April 2011 to March 2014.

Over the last decades, aviation safety has improved strongly. As a downside, airline pilots do not have as many opportunities to develop through experience the competencies that they need in critical situations.

This thesis is dedicated to the exploration of the primordial dark ages: unknown physics during the earliest stages of the Universe’s expansion that have not yet been directly probed by observations. Cosmic inflation is a burst of exponential expansion of space after the “Big Bang”.

Since its beginnings, Leiden University has been home to scholars with a broad and diverse expertise in the histories, languages, literatures and material cultures relevant to the study of Jews and Judaism from antiquity to modern times.

De onderzoeksmaster History (research) van de Universiteit Leiden biedt een keuze uit vijf specialisaties waarin je je richt op historische processen, geschiedkundig onderzoek, historiografie en methodologie.

De master International Relations van de Faculteit Geesteswetenschappen van de Universiteit Leiden biedt een volledig inzicht in de complexe factoren die kenmerkend zijn voor de moderne wereld. De opleiding legt een voortreffelijke basis voor een carrière in de internationale arena.

This thesis contains results on the arithmetic and geometry of del Pezzo surfaces of degree 1.In Chapter 1 we give the necessary background, assuming the reader is familiar with algebraic geometry.

This study attempts to understand how indigenous community institutions pose an important role in sustainable community-based development, including the integration between local culture and development.

Studenten die niet direct toelaatbaar zijn tot de Educatieve master Frans komen mogelijk in aanmerking voor een pre-masterprogramma.

Studenten die niet direct toelaatbaar zijn tot de Educatieve master Duits komen mogelijk in aanmerking voor een pre-masterprogramma.

Studenten die niet direct toelaatbaar zijn tot de Educatieve master Engels komen mogelijk in aanmerking voor een pre-masterprogramma.

Studievoorlichting

This thesis describes how different colours of light affect various aspects of the growth and development of Arabidopsis and tomato plants⁠.

In this thesis, we have used numerical approaches to study the effects of translational symmetry breaking on strange metallic systems as realised by the holographic duality⁠.

Promotor: A. Doelman, Co-promotores: P.J.A. van Heijster; A. Zagaris

Prof.dr. P. Stevenhagen, Prof.dr. K. Belabas (Universite Bordeaux I)

Een nieuw tweejarig masterprogramma Duits, verzorgd door vijf universiteiten, moet gaan voorzien in de grote vraag naar eerstegraads docenten Duits in het voortgezet onderwijs. De Universiteit Leiden is penvoerder van het programma.

Studeren in het buitenland gaat over meer dan alleen je studie. Laura Noordermeer is op uitwisseling in Seoul, Zuid-Korea en viel met haar neus in de boter: ze zag Suzanne Schulting de allereerste gouden medaille voor Nederland bij het shorttracken winnen!

Van 17 tot en met 21 augustus organiseert de Internationale Vereniging voor Neerlandistiek het Negentiende Colloquium Neerlandicum. Meer dan 250 hoogleraren en docenten uit bijna veertig landen strijken deze week neer aan de Universiteit Leiden om ervaringen uit te wisselen en nieuwe kennis op te doen…

In this thesis, I targeted the orchid genus Lepanthes, one of the six genera of angiosperms that surpasses 1,000 species in the Neotropics, as a study model to investigate the evolutionary processes that promoted species diversifications.

Promotores: H.W. Lenstra, A. Lucchini

Anthropogenic noise has been shown to affect marine animals in various ways, this may have fitness consequences at individual and population level. This thesis aims to increase insight into the quantification of sound-induced behavioural responses that are relevant to fitness, and into factors that…

β-Lactamases are enzymes that can break down β-lactam substrates, such as antibiotics, preventing the use of these antibiotics for the treatment of various infectious diseases. However, some compounds, β-lactamase inhibitors, can block these enzymes allowing for possible treatments using a combination…

Actinobacteria are Gram-positive bacteria that have a complex multicellular life cycle and are well known for their ability to produce a wide range of bioactive natural products (NPs).

If X is a locally compact Hausdorff space, then a representation of the complex C* algebra C_0(X) on a Hilbert space $H$ is given by a spectral measure that takes its values in the orthogonal projections on $H$.

The main aim of this project is to reveal and unravel the invisible histories of the UN, transcending the dominant Western perspective to recover the historical agency of Global South actors. The research will investigate how the UN has both facilitated and limited their role in shaping global order…