This thesis is an experimental study of the UV irradiation of the interstellar ice analogues, relevant for the different stages of the star and planet formation sequence.

This thesis revolves around the electronic spectroscopy of molecules in the laboratory and the search for the carriers of the diffuse interstellar bands (DIBs).

Phospholipase A/acyltransferase 3 (PLAAT3) and PLAAT4 are enzymes involved in the synthesis of bioactive lipids. Despite sequential and structural similarities, the two enzymes differ in activity and specificity.

Promotor: Prof.dr. H.L.V. Linnartz

Catalysis is of extreme relevance in the production of everyday materials and plays a central role in many aspects of our life.

Promotor: Prof.dr. E.F. Smets, Co-Promotor: L.W. Chatrou

Promotor: Prof.dr. E. Smets, M. Stech

Promotor: Prof.dr. H.P. Spaink, Co-promotor: Dr. B.E. Snaar

In the current global context, there is a pressing need to address sustainable energy supplies to safeguard our Planet and its ecosystems. The choices made by human society have a significant impact on genetic evolution and climate.

Op 11 november organiseerde de bacheloropleiding Molecular Science and Technology een corona-proof diploma-uitreiking met een bijzondere afstudeerder: de 18-jarige Ruard van Workum. Al van jongs af aan ontwikkelde Ruard een passie voor scheikunde. Hij begon op 15-jarige leeftijd met de opleiding Molecular…

Large areas of space are filled by molecular clouds that consist of gas and dust grains that are the remnants of dead stars. When these clouds start collapsing, the decreasing temperature and increasing density cause gas particles to start accreting onto dust grain surfaces.

The long-held desire - to link structure directly to function and to explain molecular mechanisms based on basic chemical or physical principles - is finally coming closer, satisfying not only our scientific curiosity but also offering new solutions to the many challenges in the field of health, energy…

This thesis is about the study of hydrocarbons via infrared spectroscopy.

Mechanical forces are known to play an important role in bacterial colonies. In this dissertation, we study the self-organization at various stages of growing bacterial colonies, and focus on the mechanical effects of cell growth.

Heterogeneous catalysis is one of the fundamental processes of modern life, being common in industrial refinery and hydrogen vehicles, all the way to the living cell. The dissociation of H2 on Cu(111) is an important benchmark system for studying heterogeneous catalysis, with a large and varied amount…

Promotor: F.P. Israel, Co-Promoter: R. Meijerink

What is the population size/structure and distribution of tiger and leopard inside the Bardia National Park (BNP) compared with the population outside? What is the movement and home range and conflict pattern in time and space of tigers and leopards inside the BNP compared with outside? What constitutes…

Heterogeneous catalyzed processes are highly significant to the chemical industry. Dissociative chemisorption (DC) of molecules on surfaces is always considered as a step with a high degree of rate control for heterogeneous catalysis.

The formation and evolution of galaxies is fundamentally driven by the formation of new stars out of cold gas.

This thesis describes a study from both a theoreticaL and an experimental point of view.

Promotor: H.V.J. Linnartz

Despite the history of studies on methanol formation from CO2, the dominant elementary reaction steps that constitute the chemical mechanism for this catalyzed process are not determined.

Wil je een volledige academische opleiding? Dan ga je na je bachelor door met een masteropleiding. Met een masterdiploma op zak heb je meer kans op een baan op academisch niveau. Na afronding krijg je de titel Master of Arts (MA).

Hybrid zones occur where two species meet and produce offspring (hybrids). Typically, hybrids show a considerable reduction in fitness. In this thesis two hybrid zones are treated.

Promotor: Prof.dr. E. Bouwman, Co-Promotor: S. Bonnet

Promotor: Prof.dr. E. F. van Dishoeck

Several techniques are explored for going beyond the born-oppenheimer static surface model for molecule-surface reactions.

Studievoorlichting

The work in this thesis demonstrates how to obtain an atomic-scale picture of a diverse set of complex surface structures observed using STM, under disparate conditions.

Promotie

Promotie

Religie is overal. Kennis van religie is essentieel voor iedereen die de wereld wil begrijpen. Het Leids Centrum voor Religiewetenschap (LUCSoR) bestudeert religie als een menselijke activiteit, in al zijn verschijningsvormen.

LUCSoR heeft leerstoelen in Vergelijkende Religiewetenschappen, Islam en het Westen, en de geschiedenis van het Christendom. Onze belangrijkste expertisegebieden zijn en Islamstudies, nieuwe spirituele bewegingen, hindoeïsme, boeddhisme, Chinese religies, West-Afrikaanse religies, antieke godsdiensten…

This thesis presents pioneering work on the panchromatic emission of some of the most luminous galaxies in the early Universe: star forming galaxies and active galactic nuclei.

Metals surfaces form a group of effective catalysts for the reaction of small molecules such as hydrogen (H2).

With increasing carbon dioxide levels in the atmosphere and their detrimental effect on the global climate, modern society needs to push for more renewable energy sources. Storing widely accessible and abundant solar energy in chemical bonds in the form of molecular fuel via artificial photosynthesis…

Organic molecules in interstellar space are important as they influence the structure of galaxies and star formations. Studying catalytic processes in space allows us to understand how molecular species are formed and chemically evolved in the interstellar medium and solar system objects.

Outflows are crucially important for the gas budget and evolution of luminous star-forming galaxies and AGNs, with observed mass outflow rates of the same order as the star formation rate. Greater star formation and black hole growth lead to more intense feedback and outflows, resulting in self-regulated…

Studievoorlichting

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In the search for sustainable energy solutions, the idea of artificial photosynthesis has been proposed as an approach with which to use water and sunlight to produce hydrogen.

Promotor: Prof.dr. E. Bouwman, Co-promotor: S. Bonnet

This thesis takes steps toward understanding the interaction between gas-phase and solid-state molecules in star- and planet-forming regions.

Promotor: M. Ubbink, Co-promotor: G. Siegal