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.

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

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…

The adsorption of D2 and CO2 on catalyst surfaces is studied using a molecular beam in ultra-high vacuum.

Afgelopen week schreef de Volkskrant een uitgebreid artikel over de bizarre levensvorm die ontstaat, wanneer een bacterie geen celwand meer heeft – een soort barbapapa’s. Eén van de experts die aan het woord komt is Leids microbioloog Dennis Claessen. Door in zijn lab bacteriën bloot te stellen aan…

In this thesis, the discovery and optimization is described of chemical tools to study the N-acylethanolamine (NAE) biosynthetic pathway.

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

This thesis advance our understanding and the application of molecular catalysts relevant to the reduction of oxygen as well as reduction of nitrite.

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.

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

The increasing resistance of pathogenic bacteria to antibiotics necessitates the discovery of new medicines.

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

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.

Promotor: H.V.J. Linnartz

Het Leids Universiteits Fonds (LUF) maakte op vrijdag 18 oktober blije studenten van Shirley van der Maarel, antropologie, en Laura Lübbert, biologie. Shirley kreeg de Janneke Fruin-Helb Beurs voor de beste subsidieaanvraag voor een buitenlandse stage, Laura de prijs voor het beste verslag na afloop…

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

Promotor: Prof.dr. M. Danhof, Co-Promotor: J. de Jongh

Organisms often need to adapt more efficiently and devise new strategies for surviving difficult ecological circumstances.

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

Developing new medicines is one of modern science's most significant hurdles, a process marked by high costs, long timelines, and frequent failures of promising candidates.

Veertien bachelor- en masterstudenten vertegenwoordigen dit jaar Leiden in de International Genetically Engineered Machine wedstrijd iGEM. Hun plan: een test maken die snel in staat is om besmettelijke ziektes te identificeren in het geval van een uitbraak.

Zuurstof is essentieel voor ons om te leven. Maar zuurstof kan, in de vorm van reactieve moleculen, ook schadelijk zijn. Gelukkig bevat de buitenste laag van onze huid antioxidanten die de meeste schadelijke zuurstof direct uitschakelen, zo ontdekten Leidse chemici. Hun resultaten staan beschreven in…

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

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

The bacterial cell wall is a nearly universal structure that offers protection and gives the cell its shape. However, environmental stressors, such as cell wall-targeting antibiotics and hyperosmotic conditions, can induce bacteria to shift to a wall-deficient state. It is unknown whether the lack of…

The study of orchid flowers, fruits, and inflorescences is crucial due to the remarkable diversity of orchid species and their unique adaptations to pollinators and seed dispersers. However, our understanding of the evolution and development of these organs within the orchid family remains limited.

In populations with a seed-bank, individuals can temporarily become dormant and refrain from reproduction until they can become active again. The repository of all dormant individuals in the population is called the seed-bank. Seed-banks are observed in many taxa, including plants, bacteria and other…

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.

Het Natuurwetenschappelijk Gezelschap Leiden (NGL) vierde op vrijdag 24 april 2015 haar 145 jarig bestaan met een lustrumexcursie naar het Instituut voor Biologie Leiden (IBL), Universiteit Leiden. Hier kregen de leden en gasten, waaronder veel alumni, een kijkje achter de schermen van het instituut…

Zijn Weyldeeltjes de ideale geleiders? Spelen celwandloze cellen een rol in chronische Tuberculose-infecties? Deze vragen willen Carlo Beenakker en Dennis Claessen beantwoorden. Ze ontvingen hiervoor een ENW-KLEIN-subsidie van NWO. Met de beurzen wil NWO vernieuwend, fundamenteel onderzoek stimulere…

Promotie

The cannabinoid receptor type 2 (CB2R) is associated with several inflammatory diseases with an unmet medical need (e.g. Alzheimers, multiple sclerosis, reumatoid arthritis). Development of new chemical biology strategies to study this protein is essential to aid future development of drugs for these…

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.

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

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

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

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

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…

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.

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…