2,791 zoekresultaten voor “chemische we ons” in de Publieke website
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Transfer of "goods" from plants to humans: Fundamental and applied biochemical investigations on retaining glycosidases
The studies described in this thesis deal with glycosidases, in particular alpha-galactosidases.
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Copper trispyrazolylborate complexes for ethene detection
Promotor: E. Bouwman, Co-Promotor: S. Bonnet
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Targeting bacterial pathogens with next-generation glycoconjugate vaccines
Promotie
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Puzzling Pyrophosphates
Promotie
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Essentiality of conserved amino acid residues in β-lactamase
Evolution acts via mutations in amino acid sequences. Substitution of essential amino acids leads to a nonfunctional protein. l.
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Studieprogramma
LST biedt een uniek onderwijsprogramma dat zich richt op de levende cel. De bacheloropleiding duurt drie jaar. Tijdens je eerste jaar werk je aan een stevig fundament. Daarna is er meer ruimte voor specialisatie.
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Kunnen we door deze ontdekking straks betere katalysatoren ontwerpen?
Waar aan het oppervlak van een katalysator vinden precies de chemische reacties plaats? Tot voorheen bleef het altijd een uitdaging om de exacte locaties van deze ‘actieve sites’ te identificeren. In een nieuw artikel in Nature onthullen Leidse scheikundigen en hun internationale collega’s nieuwe inzichten…
- De magie van licht: de interactie van licht met moleculen en materialen
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Chemici lossen hardnekkig probleem op na vier decennia
Leidse en Eindhovense scheikundigen hebben na decennia de discussie beëindigd over het juiste model voor de eenvoudigste chemische reactie in heterogene katalyse, die essentieel is voor brandstofcellen. Met behulp van een uniek gekromd platinaoppervlak toonden de Leidse Ludo Juurlink, zijn promovendus…
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Bekostiging van zorg en welzijn – hoe ondersteunen we de transitie naar passende zorg?
Studievoorlichting
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Medicijnen ontdekken en ontwikkelen
De gezondheidszorg verbeteren met onze wetenschappelijke ontdekkingen, dat is het doel van het Leidse onderzoek naar geneesmiddelen. En daar komt veel bij kijken. Ons onderzoek begint bij de ontdekking van de werking van een stof en gaat soms zelfs door tot de ontwikkeling van een geneesmiddel voor…
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Nieuwe antibiotica
Ziekteverwekkende bacteriën zijn steeds vaker resistent voor de huidige antibiotica. De vraag naar nieuwe antibiotica wordt daarmee steeds groter. Professor Gilles van Wezel zoekt naar nieuwe vormen van antibiotica in goede bacteriën die in de grond leven.
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‘Ontrafelende Europese samenwerking bedreigt de waarden waar we voor staan’
De stagnerende samenwerking in Europa ondermijnt onze vrijheid en de rechten die verankerd zijn in de Europese rechtsorde, stelt Piet Hein Donner, vice-president van de Raad van State en Cleveringa-hoogleraar. In zijn oratie op 26 november bespreekt hij de richtingen waarin we verder moeten gaan.
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Hilde Pracht-AltorfWiskunde en Natuurwetenschappen
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Tom O'BrienWiskunde en Natuurwetenschappen
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Vuurarcheoloog Femke Reidsma: ‘Vuur vertelt ons wie we zijn geworden’
Archeoloog Femke Reidsma (33) doet onderzoek naar de rol van vuurgebruik in de evolutie van de mens. Leids Universiteits Weekblad Mare schreef over haar onderzoek. ‘Je wordt beter in een kampvuur aan de gang houden als je het chemische proces begrijpt.’
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Design and Synthesis of Inhibitors and Probes for Sulfoquinovosidases and Xylanases
This thesis focuses on the design and synthesis of activity-based probes and inhibitors targeting enzymes involved in the degradation of specific plant glycans.
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Bioorthogonal deprotection strategy to study T-cell activation and cross- presentation
Cytotoxic T-cells (CTLs) are involved in the clearance of viruses and killing of tumor cells.
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Towards the development of synthetic vaccines against tuberculosis
The research described in this Thesis was aimed at designing and synthesizing nature-inspired compounds as part of TB vaccine discovery.
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Synthetic peptides as tools in chemical immunology
This thesis has described novel synthetic methods to produce a variety of (glyco)peptides and their application in the study of various immunological processes.
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NMR studies of protein-small molecule and protein-peptide interactions
Promotor: M. Ubbink, Co-promotor: G. Siegal
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Development of homogeneous catalysts for the selective conversion of levulinic acid to caprolactam
Promotors: Prof.dr. E. Bouwman, Prof.dr. E. Drent
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Hydrogen dissociation on metal surfaces
Dissociative chemisorption is an important reaction step in many catalytic reactions.
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Influence of the electrode-electrolyte interface on electrochemical CO2 reduction reaction and hydrogen evolution reaction
The goal of this thesis is to understand how interfacial parameters, such as the addition of organic additives, bulk pH or metal cations of the electrolyte, affect the relevant electrocatalytic reactions, i.e. electrochemical CO2 reduction reaction or hydrogen evolution reaction.
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Computational electrocatalysis
This dissertation focused on computational methods based on first principles calculations using the Density Functional Theory (DFT) framework. Emphasis was laid on affordable methods that can provide a tradeoff between computational expense and accuracy.
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Towards in-cell structural study of light-harvesting complexes : an investigation with MAS-NMR
Light-Harvesting Complex II (LHCII) is responsible for light absorption and excitation energy transfer in plants and photosynthetic algae, while in high light it undergoes conformational changes by which it quenches excitations to prevent photodamage.
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Activity-based protein profiling of diacylglycerol lipases
Promotor: H.S. Overkleeft, Co-promotor: M. van der Stelt
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Synthesis of well-defined ADP-Ribosylated biomolecules
Promotor: G. A. van der Marel, Co-promotor: D. V. Filippov
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Pair configurations to molecular activity coefficients: PAC-MAC
This thesis provides an overview of the development of the Pair Configuration to Molecular Activity Coefficient (PAC-MAC) model.
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The synthesis of mannose-derived bioconjugates and enzyme inhibitors
Promotores: H.S. Overkleeft, G.A. van der Marel, Co-Promotor: J.D.C. Codee
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Peptide amphiphiles and their use in supramolecular chemistry
Promotor: Prof.dr.ir. J.G.E.M. Fraaije, Co-promotor: A. Kros
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Highly Accurate Simulations and Benchmarking of Molecule-Surface Reactions
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.
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Synthesis and applications of cell wall glycopolimer fragments from Staphilococci and Enterococci
Carbohydrates are present on the surface of bacteria making them suitable antigen candidates for vaccine development. This thesis deals with the synthesis of two carbohydrate-based components; the capsular polisaccharide of S. aureus type 5 and teichoic acids from staphilococci and enterococci speci…
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Cyclophellitol and its derivatives: synthesis and application as beta-glycosidase inhibitors
Promotores: Prof.dr. H.S. Overkleeft, Prof.dr. G.A. van der Marel
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'Q-wires': Synthesis, electrochemical properties and their application in electro-enzymology
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'.
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Fluorescence Polarization Activity-Based Protein Profiling on Retaining Glycosidases
Glycosidases are important enzymes in the turnover of polysaccharides and glycoconjugates, and are involved in a range of human pathologies including genetic disorders such as Gaucher and Pompe disease, but also in various cancers.
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Coherent dynamics in solar energy transduction
Promotor: Prof.dr. H.J.M. de Groot, Co-promotor: Francesco Buda
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Gaining control of lipid-based nanomedicine by understanding the nano-bio interface
Dit proefschrift beschrijft een collectie aan alternatieve strategieën voor het begrijpen, ontwerpen en toepassen van lipide nanosystemen, waarin de rol van de bio-nano interacties centraal staan. In het bijzonder wordt gekeken naar de interactie van RNA-lipide nanosystemen, bekend van de toepassing…
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Kunstmatige fotosynthese
Voor de omzetting van zonlicht naar brandstof
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Iminosugars as glucosylceramide processing enzymes inhibitors: design, synthesis and evaluation
This Thesis describes the design, synthesis and evaluation as glycoprocessing enzyme inhibitors of focused libraries of iminosugars.
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Functionalizing monolayer graphene as a proton-selective membrane for direct methanol fuel cells
This thesis focused on the exploration of monolayer graphene as a membrane in direct methanol fuel cell (DMFC) applications, with improvements achieved through plasma exposure or damage- free chemical functionalization.
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Photocatalytic approaches for carbon-heteroatom bond construction
Photocatalysis has emerged as a powerful tool for enabling challenging transformations in organic synthesis. This thesis explores the development of several photocatalytic reactions designed to form carbon-heteroatom bonds from less-functionalized precursors.
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Graphene transmembrane nanofluidic devices: Fabrication strategies and ion transport
This dissertation was to develop effective graphene-based nanofluidic devices by developing scalable fabrication methods and elucidating proton transport mechanisms.
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Synthesis and Characterization of Boron, Nitrogen, and Carbon-Based Two-Dimensional Materials
This thesis comprises the development of reproducible synthesis procedures for two-dimensional materials (composed of boron, nitrogen and carbon) on different metallic surfaces.
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Total Synthesis of Alginate and Zwitterionic Sp1 Oligosaccharides
The work in this thesis has been focused on two subjects. The first is the assembly of alginate oligosaccharides and the generation of building blocks for the enzymatic synthesis of alginate, and the second is the total synthesis of large fragments of the zwitterionic SP1 polysaccharide.
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Design, synthesis, and evaluation of antigenic peptide conjugates containing Toll-like receptor agonists
This thesis describes the design, synthesis, and immunological evaluation of varying (neo)antigenic peptide conjugates containing either a TLR2 or a TLR7 agonist.
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Evolutionary molecular dynamics
This thesis introduces the concept of
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Towards Photocatalytic Water Splitting in Homogeneous Solutions Using Molecular Metalloporphyrin Photosensitizers and Catalysts
Indonesia is experiencing various environmental challenges related to its fast economic growth. Therefore, it is necessary to have measurable and applicable indicators to obtain accurate data and information regarding the costs of adverse environmental impacts arising from economic activities to support…
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Squaramide-based supramolecular materials for 3D cell culture applications
A new type of tripodal squaramide-based supramolecular hydrogels is developed and studied.
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Novel Protecting Group Strategies in the Synthesis of Oligosaccharides
The thesis focuses on synthesis strategies in oligosaccharide campaigns, and the influence of protecting groups.