The thesis describes terrestrial field trials aimed to detect side-effects of pesticides within the framework of pesticide registration procedures. Field trials were developed using vascular plants Brassica napus and Poa annua, caterpillars Pieris brassicae and effects on decomposition were studied…

De Nobelprijs voor Scheikunde 2017 is uitgereikt aan Jacques Dubochet, Richard Henderson en Joachim Frank, voor hun ontwikkeling van de cryo-elektronenmicroscopie. Met deze techniek kunnen biomoleculen in 3D in beeld gebracht worden, legt hoogleraar Ultrastructuurbiologie Ariane Briegel uit.

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Dit project ontwikkelt methoden om de anonimiteit van individuen in sociale netwerkgegevens te waarborgen.

This thesis focuses on addressing four research problems in designing embedded streaming systems.

Aan de Universiteit Leiden werken wetenschappers uit alle disciplines samen om antwoorden te vinden en om te innoveren op het gebied van kunstmatige intelligentie.

‘We moeten op zoek naar producten die gewone wegwerpplastics kunnen vervangen, bijvoorbeeld van plantmateriaal. Binnen een jaar of 20 is het gemiddelde plasticgebruik van een huishouden met grote slagen verminderd.’ Volgens Thijs Bosker, Universitair Hoofddocent aan het Leiden University College, in…

De progressie van menselijke ziekten als kanker en TBC is goed te bestuderen in larven van zebravissen. Met robots en automatische herkenning van microscopische beelden gaan bioloog Herman Spaink en informaticus Fons Verbeek uitzonderlijk snel het effect van nieuwe medicijnen testen. De aanschaf van…

De onderzoeksgroep Business, Technology & Public Policy van de afdeling Bedrijfswetenschappen van Universiteit leiden houdt zich bezig met het onderzoeken van de dynamische wisselwerking tussen ‘nieuwe’ technologieën en de verschillende belanghebbenden die hiermee interacteren, waaronder consumenten,…

Hoe kunnen we onze maatschappij zo inrichten dat de wereld leefbaar blijft voor onszelf en al het andere leven om ons heen? Aan dat vraagstuk werken Leidse wetenschappers samen vanuit allerlei disciplines, van biologie tot datawetenschap en van milieueconomie tot archeologie.

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Om goed onderbouwde besluiten over complexe onderwerpen zoals het klimaat, recht en gezondheid te kunnen nemen, zijn wetenschappelijke resultaten van groot belang. Maar wetenschappelijke resultaten bevatten altijd een mate van onzekerheid. Binnen het onderzoek Communicatie over onzekerheden wordt onderzocht…

Promotores: H.A. Udo de Haes, H.H.T. Prins, Co-promotor: H.H. de Iongh

Vitamin A or retinol is essential in embryonic development, the visual cycle and the immune system.

This thesis describes the use of bioorthogonal proteins in immunological settings. It provides an introduction towards the field of protein modification, which was used throughout the thesis for the expression of proteins containing unnatural amino acids.

Cardiovascular diseases (CVDs) are the leading global cause of mortality. Endothelial dysfunction, an early reversible stage of CVD development, is marked by decreased nitric oxide production linked to Ca2+ influx in endothelial cells.

Promotores: Prof. dr. G.R. (Geert) de Snoo, Dr. E. (Ester) van der Voet

In a typical glycosylation reaction, a donor is activated to form a (variety of) electrophilic species which can react with a nucleophilic acceptor, following a reaction mechanism having both SN1 and SN2 character.

The endocannabinoid receptors CB1R and CB2R are involved in a plethora of processes, and consequently are involved in many pathological conditions. Their wide distribution makes the CBRs both an interesting therapeutic target and hard to study.

The rapidly increasing commercial application of metallic nanoparticles within products will inevitably enhance the amount of NPs being released into soil.

Despite the fact that gold nanoparticles (GNPs) are one of the most studied nanoparticles, there is still a necessity for new approaches allowing for effective protective coating to enable wider use of GNPs in biomedical applications.

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.

Promotor: T. Schmidt, Co-Promotor: B.E. Snaar-Jagalska

Promotor: Prof.dr. W.J.G.M. Peijnenburg

Plant diversity is essential for us and our planet as it sustains the stability of our ecosystems, provides vital materials and food to us and supports many ecosystem services.

The lysosomal β-glucosidase named glucocerebrosidase (GCase) is a retaining β-glucosidase that hydrolyzes the glycosphingolipid glucosylceramide (GlcCer) to ceramide and glucose at acid pH.

Promotor: H.P. Spaink, Co-Promotor: A.H. Meijer

Large carnivores and humans, along with their livestock, have co-existed for thousands of years. However, human population growth and an increase in economic activities are modifying the landscape for large carnivores and their prey.

Promotores: Prof.dr. H.P. Spaink & Prof.dr. P.C.W. Hogendoorn Co-promotor: Dr. M.J.M. Schaaf

In times of hardships or crisis, local people know how to deal with it using their resourcefulness. Although efforts are sometimes made by the government to help them, they are fully aware that community support is at least equally important.

The research of the Applied Mathematics cluster is concerned with such diverse topics as dynamical systems, representation theory, differential equations and pattern recognition.

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: J.P. Abrahams, Co-promotor: T. Grüne

Every organisms in the tree of life faces the same challenge: the length of its DNA exceeds the volume of the cell it needs to fit in. Several strategies have evolved to solve this problem, one of them being the expression of proteins that bind and organize the DNA.

Promotor: H.P. Spaink, A.H. Meijer Co-promotor: R. Marin-Juez

Schistosomiasis is an acute and chronic disease caused by blood dwelling parasitic trematodes of the genus Schistosoma, and it is classified as the second most socioeconomically devastating parasitic disease, second only to malaria.

Promotores: W. Th. F. den Hollander, M.O. Heydenreich

Streptomyces are bacteria abundant in soil that participate in diverse and complex interactions. These bacteria are the main producers of the antibiotics we currently use in the clinic.

Monoacylglycerol lipase (MAGL) is the principal enzyme responsible for hydrolysis of the endocannabinoid 2-arachidonoylglycerol (2-AG). MAGL inhibition provides several potential therapeutic opportunities, including anti-nociceptive, anti-inflammatory and anti-cancer activity.

Promotor: W.T. de Groot

Protein–protein complexes are formed via transient states called encounter complexes that greatly influence the formation of the stereospecific complex.

This thesis describes the role of pollution, specifically neonicotinoid insecticides, as an actor of the ongoing biodiversity decline.

The spindle-assembly checkpoint (SAC) is a safety mechanism which secures accurate chromosome segregation during mitosis.

PNEC-pro is a user-friendly screening tool for professionals dealing with the assessment of surface water quality. The tool calculates local, watertype specific no-effect concentrations (PNEC) of copper, lead, nickel and zinc based on biotic ligand models (BLMs).

Streptomyces bacteria are a valuable source of natural products, many of which are used in the clinic or in biotechnology.