Hoe ontstaan sterren en planeten? Is er leven mogelijk buiten de aarde? Dit onderzoekt hoogleraar moleculaire astrofysica Ewine van Dishoeck van de Universiteit Leiden. Voor haar baanbrekende werk krijgt ze de prestigieuze Kavli-prijs in de categorie astrofysica: 1.000.000 dollar en een gouden medaille.…

The haplolepideous mosses (Dicranidae) comprise about 4000 species distributed over a wide range of habitats, with great gametophytic and sporophytic morphological variation. Their monophyly is well supported by the results of several molecular phylogenetic studies, which shed light on their relationships…

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…

Fundamental understanding of molecular reactions on metal surfaces is important for improving heterogeneous catalysis.

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.

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.

The space between the stars isn't simply a void; it also contains substances such as methanol and carbon dioxide. So far, chemical theories have been unable to explain how these substances originate under circumstances that should make it impossible. Fedor Goumans has been awarded a Veni subsidy to…

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

De Fritz Zwicky-prijs 2022 voor astrofysica & kosmologie is toegekend aan Prof. Ewine F. van Dishoeck voor haar baanbrekende, decennialange werk in de astrochemie en moleculaire spectroscopie, en voor haar leiderschap binnen de astronomische gemeenschap. De toekenning van de prijzen is vandaag bekendgemaakt…

Isa Oliveira (33) uit Brazilië studeerde astrofysica in Leiden en promoveerde bij de Sterrewacht. ‘Daar had ik toegang tot faciliteiten waar ik daarvoor alleen maar van kon dromen.'

Laboratory, observation and modeling work on the dissociation of polycyclic aromatic hydrocarbons in interstellar environments and the formation of new molecular species through the fragmentation process.

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

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

A dense region of a gaseous and dusty cloud collapses to form a protostar surrounded by a disk and an envelope. This thesis uses both observations and models to study physical and chemical conditions of these protostellar systems which are likely where planets start to form.

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

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

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

Protoplanetary disks are the gas and dust environments where planetary systems form around young stars. Using observations from the Atacama Large Millimeter/submillimeter Array (ALMA) this thesis analyses the gaseous molecular reservoir, using multiple tracers to resolve the 3D structure of protoplanetary…

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.

De Leidse hoogleraar moleculaire astrofysica en astrochemie Ewine van Dishoeck heeft vrijdag 7 oktober de Niels Bohr International Gold Medal ontvangen. De medaille, die is ingesteld door de Deense ingenieursvereniging IDA, werd uitgereikt door Koningin Margrethe van Denemarken tijdens een ceremonie…

Until the 1990s, the only known planets were those in our Solar System. Three decades later, several thousand exoplanets have been discovered orbiting stars other than the Sun, and substantial efforts have been made to explore these strange new worlds through spectroscopic analyses of their atmosphe…

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…

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…

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…

Planets are formed in disks of gas and dust around young stars.

Promotor: Prof.dr. I.A.G. Snellen, C.U. Keller

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

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

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

Op 8 juli verwelkomde de Leidse Sterrewacht acht bachelor studenten van de Beijing Normal University voor de BNU Astronomie Summer School. In twee weken tijd volgenden de Summer School-studenten een interactief programma over computationele astrofysica. ‘Het verbaast me hoeveel je kunt leren in twee…

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.

Diverse types of exoplanets such as gas giants on close-in orbits (hot Jupiters) and young massive giants on wide orbits (super Jupiters), with no analogs in the Solar System, pose challenges but also opportunities to our understanding of planet formation and evolution.

Detecting planets during their formation stages is crucial for understanding the history and diversity of fully developed planetary systems like our own. However, observing young planets directly is challenging because they are often deeply embedded within their host protoplanetary discs, rich in gas…

In de Paradisolezingen 2014 worden zin en onzin van wetenschappelijke thema’s in speelfilms belicht.

Is de aarde de enige planeet in het heelal waar leven is, of zouden er ook andere kunnen zijn? Hoe zijn sterren en planeten eigenlijk ontstaan? Is er water – de bron van leven – elders in het heelal?

Van de ontdekking van exoplaneten tot de vondst van buitenaards leven. Op het Gala van de Sterrenkunde op 17 december in de Leidse Stadsgehoorzaal blikten sterrenkundigen terug en vooral vooruit. Met koning Willem-Alexander als eregast.

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

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.

Hoogleraar moleculaire astrofysica Ewine van Dishoeck is tijdens de Avond van de Chemie benoemd tot erelid van de KNCV. Voorzitter Flors Rutjes was te spreken over hoe Van Dishoeck het vakgebied astrochemie op de kaart heeft gezet.

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

Het is Leidse wetenschappers gelukt om computers berekeningen te laten maken tot duizend cijfers achter de komma.