This thesis systematically studies the physicochemical properties of non-planar, propeller-shaped, polycyclic aromatic hydrocarbons. The synthesis of several so-called propellerenes is described on a gram scale, using optimized procedures aimed at using less hazardous reagents and reducing the amount…

As a virtually inexhaustible source, solar energy plays a major role in future global energy scenarios.

Biological polymers, including proteins and the genome, undergo folding processes crucial for their proper functioning. Even slight changes in the folding structure of these biopolymers can have significant implications, leading to the development of various pathological conditions, such as neurodegenerative…

Multicellular giant algae Chara species have been widely used in physiological studies for decades.

Promotores: C.A.M.J.J. van den Hondel, V. Meyer, Co-promotor: A.F.J. Ram

Neuraminidases are enzymes that cleave glycosidic linkages of sialic acid. These enzymes are involved in influenza infections as well as in many cellular processes in mammals and micro-organisms.

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Promotie

Promotor: A.P.IJzerman, Co-Promotor: L.H. Heitman

This thesis has described novel synthetic methods to produce a variety of (glyco)peptides and their application in the study of various immunological processes.

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…

The largest genus within the Phyllanthaceae family is a group called Phyllanthus L. Recent studies have shown, that Phyllanthus is paraphyletic with the genera Glochidion, Breynia and Synostemon nested within it.

There is a need for alternative methods to replace, reduce and refine (3R) animal experimentation. Combining experimental data from high-throughput in vitro studies with in silico modeling is a promising approach to unravel the effect of chemicals on living cells and to gain a better understanding of…

Promotor: H.S. Overkleeft, Co-promotor: M. van der Stelt

Dissochaeta Blume (Melastomataceae, tribe Dissochaeteae) is well-known as a scrambling plant genus found in Southeast Asia, where it is an inhabitant of the tropical rainforests or evergreen forests.

De Microscopy Unit huisvest, onderhoudt en coördineert vrijwel alle microscopieapparatuur van het IBL. De beschikbare apparatuur varieert van conventionele licht- en fluorescentiemicroscopen tot confocale laser- en elektronenmicroscopen. Er is bovendien apparatuur beschikbaar voor histologie, met inbegrip…

An objective of this research was to achieve direct, well-defined and non-rate-limiting electron transfer between respiratory enzymes and the electrode surface by means of 'Q-wires'.

We showed that constitutive and inducible chemical and morphological defenses against Western flower thrips differ between tomato and chrysanthemum plants.

Nature uses a special class of histone proteins, histone variants, to modulate the properties of chromatin at defined genomic locations.

BlaC is the β-lactamase of Mycobacterium tuberculosis. We show that it can recover from inhibition by clavulanic acid and that phosphate helps it do so.

Endocannabinoids are lipid messengers that modulate various physiological functions by activating the cannabinoid CB1 and CB2 receptors. While the metabolism of endocannabinoids and their action at the CB receptors is fairly well studied, the molecular mechanisms governing their release and transport…

With an emphasis on developing novel miktoarm star polymers termed PeptoMiktoStars, this thesis leverages asymmetric polymeric polypept(o)ide frameworks to advance their effectiveness in delivering hydrophobic drugs and nucleic acids.

Almost all bacteria are enveloped by a cell wall that provides cellular protection.

Promotor: Erik F. Smets, Co-promotores: Barbara Gravendeel, Niels Raes

Promotor: Prof.dr. J.P. Abrahams

Metabolomics is a powerful tool that can provide a comprehensive insight into the complexity of human biology and the pathophysiology of diseases. By analyzing the metabolome, which refers to the complete set of small (endogenous) molecules (with a mass <1500 Da) present within a given biological system,…

During the course of drug discovery translational steps are made.

Promotor: Prof.dr. M. Ubbink

N-acylethanolamines (NAEs), including N-arachidonoylethanolamine (anandamide, AEA), N-palmitoylethanolamine (PEA) and N-oleoylethanolamine (OEA), are signaling lipids that play an important role in different physiological process.

Antibioticaresistente bacteriën vormen wereldwijd een groot probleem. Moleculair bioloog Changsheng Wu verkende in zijn proefschrift innovatieve methoden om eenvoudiger en sneller nieuwe antibiotica te ontwikkelen en ontdekte bovendien een nieuw type antibiotica.

Is het mogelijk om ziektes te diagnosticeren met behulp van moleculaire schakelaars? Over die vraag buigt het nieuwe internationale consortium LogicLab zich. Vanuit Leiden zijn scheikundige Sylvestre Bonnet en farmacoloog Thomas Hankemeier betrokken. Het project loopt voor vier jaar en krijgt ruim 3,5…

Team Leiden gaat door naar de finale van de Academische Jaarprijs. Het team onderzoekt hoe ziekenhuisbacterien ontstaan en hoe de juiste antibiotia gevonden kunnen worden. Met de uitbraak van de EHEC-bacterie in het achterhoofd kan de speurtocht van Team Leiden het verschil gaan maken!

Voor Molecular Science and Technology is de matchingsactiviteit een verplicht onderdeel van de inschrijving.

Kunstmatige fotosynthese heeft als doel om via chemische processen zonne-energie om te zettn in brandstof. Semi-kunstmatige fotosynthese is een hybride aanpak waarbij chemische maar ook biotechnologische processen worden gebruikt. Wij hebben als doel om een hybride systeem te ontwikkelen met behulp…

Wil jij de beste redenen weten waarom je aan de Universiteit Leiden moet studeren? Of hoe het is om te leven in studentensteden zoals Leiden of Den Haag? Onze studenten vertellen je over hun studie aan de Universiteit Leiden.

Wil jij de beste redenen weten waarom je aan de Universiteit Leiden moet studeren? Of hoe het is om te leven in studentensteden zoals Leiden of Den Haag? Onze studenten vertellen je over hun studie aan de Universiteit Leiden.

Bodembacteriën kunnen een schat aan antibiotica maken die nieuw voor ons zijn, stelt Gilles van Wezel. Zijn groep ontwikkelde een methode om die onbekende verbindingen snel te identificeren en te produceren. In Chemistry & Biology laten de onderzoekers zien dat de aanpak werkt.

Promotor: Prof.dr. A.G.G.M. Tielens

This thesis describes biochemical investigations of glucocerebrosidase (GBA), the lysosomal β- glucosidase that is deficient in Gaucher disease (GD).

Promotor: M.T.M. Koper, Co-promotor: L. Juurlink

The work presented in this thesis is based on ALMA surveys of protoplanetary disks in three star-forming regions: Lupus, OMC-2, and NGC 2024.

A large diversity of exoplanetary systems has been found, but it is still unclear what drives this diversity.

Adenosine is an endogenous ligand which exerts its action by activating adenosine receptors (ARs), while its circulating levels are controlled via a variety of mechanism and proteins, amongst others the equilibrative nucleoside transporters (ENTs).

Taxonomy as a science has accumulated data and knowledge for more than 250 years.

Promotor: H.S. Overkleeft, Co-promotor: M. van der Stelt

We developed the bitterling as a unique, well-studied model organism in the area of the evolutionary ecology of brood parasitism. The bitterling-mussel relationship, interspecific mussel host preference, and mussel gill structure are studied in detail, to help understand the developmental adaptation…

Promotores: T.H.W. Bäck, A. Plaat, Co-promotor: F.J. Verbeek

Diacylglycerol lipases (DAGLα and DAGLβ) are responsible for the biosynthesis of the endocannabinoid 2-arachidonoylglycerol (2-AG) in the brain and peripheral tissues. Selective DAGLβ inhibitors have been proposed as a potential treatment for inflammatory diseases with reduced potential for central…