1,865 zoekresultaten voor “organic chemisch” in de Publieke website
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Breeding birds on organic and conventional arable farms
Promotor: G.R. de Snoo
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Poprhyrin-based metal-organic frameworks for the electrochemical oxygen reduction reaction
Hydrogen peroxide (H2O2) is an important bulk chemical that is used in various industrial processes. More than 95% of the H2O2 used in industry is made via the anthraquinone process during which a large amount of energy is going to waste.
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Electrocatalysis in Confinement: Metal-Organic Frameworks for Oxygen Reduction
The confinement of molecular catalysts in metal-organic frameworks has the potential to lead to significant improvements in selectivity, long term activity and catalyst stability.
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Molecular inheritance from cloud to disk: a story of complex organics and accretion shocks
Stars like the sun are born in large molecular clouds existing from gas and dust. During the formation process, the chemical composition of the material can be altered drastically by the changing physical conditions.
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The hunt for frozen organic molecules in space
Complex Organic Molecules (COMs) have been detected in objects across different stages of stellar evolution.
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Soil organic amendments for climate-smart agriculture
Organic amendments applied to agricultural fields can partially offset our carbon emissions to the atmosphere and improve the resilience of agriculture to the effects of climate change. Driving these benefits, however, are complex and poorly understood interactions between organic amendment properties,…
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A song of ice and gas: the formation and evolution of complex organic molecules
Understanding how chemical complexity emerges during star formation requires connecting molecular material preserved in interstellar ices with that observed in the gas phase after protostellar heating begins.
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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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energy electron transmission through layered materials and chiral organic films
In this Ph.D. thesis we study the interaction of low energy electrons with thin materials, namely layered materials (graphene, hexagonal boron nitride, molybdenum disulfide) and organic films. At these low energies the quantum mechanical wavelength of the electron wave function is in the order of a…
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The formation of complex organic molecules in dense clouds-Sweet results from laboratory
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.
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Het Chemisch Dispuut Leiden Reünistendag
Alumni-activiteit
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Thiosugars: reactivity, methodology and applications
Carbohydrates, alongside proteins and nucleic acids, constitute a crucial and versatile family of biomolecules present in all life forms. They manifest as monosaccharides, oligosaccharides, and polysaccharides, covalently bonded to proteins and fats. Carbohydrates are integral to plant and arthropod…
- Een kijkje in de keuken bij de chemische industrie: katalyse
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Computational and experimental studies of reactive intermediates in glycosylation reactions
Carbohydrates, or sugars, are the most diverse and most abundant biomolecules known. However, the isolation of carbohydrate samples in sufficient amounts and purity is often impractical or even impossible, so the chemical synthesis of glycosides becomes relevant. The glycosylation reaction, in which…
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Synthetic, Physical and Computational Chemistry of Propeller-shaped Polycyclic Aromatic Hydrocarbons
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…
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Inhibitors and probes targeting mannanases
This thesis describes the synthesis and biochemical evaluation of a variety of cyclophellitol based activity-based probes and inhibitors targeting various endo- and exo-acting retaining glycosidases. In the last two decades a variety of probes and inhibitors for (hemi)cellulose degrading enzymes have…
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Synthesis of phosphodiester-containing bacterial cell wall components: teichoic acids, capsular polysaccharides and phosphatidyl glycerol analogues
Promotor: G.A. van der Marel, Co-promotor: J.D.C. Codée
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Luminescence and applications of lanthanoid coordination polymers
Promotor: E. Bouwman, Co-Promotor: S. Bonnet
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Synthesis of mycobacterial phenolic glycolipids
Het proefschrift omschrijft de chemische synthese van fenolische glycolipiden van verschillende mycobacteriën met het doel om deze te kunnen gebruiken voor immunologisch onderzoek.
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Synthesis of D-alanylated wall teichoic acids from staphylococcus aureus
This Thesis describes the synthesis of D-alanylated ribitol-based wall teichoic acids from S. aureus to probe their interaction with immune-binding partners.
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The use of activity based protein profiling to study proteasome biology
Promotor: H.S. Overkleeft, Co-Promotor: B.I. Florea
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The synthesis of chemical tools for studying sphingolipid metabolism
Sphingolipids are important membrane compounds with a variety of functions. In mammalian cells, different enzymes are involved in the metabolism of sphingolipids, but interruption of this metabolism process leads to different diseases.
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A bioorthogonal chemistry approach to the study of biomolecules in their ultrastructural cellular context
In this thesis the combinatorial use of bioorthogonal labelling and Electron Microscopy (EM)-based imaging techniques is explored to enable observations of specific molecular targets in their ultrastructural context within the cell.
- Onderzoeksoutput
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Afscheidscollege prof.dr. H.J.M. de Groot
Afscheidscollege
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Synthetic peptides, nucleic acids and molecular probes to study ADP-Ribosylation
This thesis presents the first synthetic peptides ADP-ribosylated on serine, threonine, tyrosine, arginine and cysteine.
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Design of branched swainsonines as selective Colgi alpha-mannosidase II inhibitors
Design and synthesis of two 3-substituted swainsonine derivatives with the aim to improve the potency and selectivity towards Golgi alpha-mannosidase II.
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Design of selective inhibitors for human immunoproteasomes
The thesis describes the development, synthesis and biological evaluation of several proteasome inhibitor designs. Mainly, this work focusses on designing proteasome inhibitors that selectively inhibit the immunoproteasome, while leaving the constitutive proteasome mostly, if not completely, untouch…
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Exploring the Versatility of Human β-Glucosidases and Related Glycosylated Metabolites with Novel Chemical Tools
Thesis focused on uncovering the underlying mechanisms of the lysosomal storage disorders Gaucher's disease using chemical tools, biochemical assays and lipidomics.
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Inhibitors and probes targeting endo-glycosidases
The chemical synthesis of inhibitors and probes targeting endo-glycosidases.
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Design and synthesis of next generation carbohydrate-mimetic cyclitols: towards deactivators of inverting glycosidases and glycosyl transferases
Synthetic methodlogy is described, aiding in the synthetic preparation of putative inhibitors of retaining and inverting glycosidases and glycosyl transferases. All constructs are cyclophellitol-based cyclitols.
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Reactivity and Selectivity in Glycosylation Reactions
The glycosylation reaction is a pivotal reaction in creating new and complex oligosaccharides.
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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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Chemische gereedschapkist in de strijd tegen kanker
Chemische stoffen maken, om biologische vragen mee op te lossen. Wouter van der Linden vat even kort de chemische biologie samen. Daaraan levert hij zijn bijdrage met stoffen die uiteindelijk behulpzaam zijn in de strijd tegen kanker: ‘Dus niet de medicijnen zelf, maar een chemische gereedschapskist…
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A chemical biology approach for targeting of ligand-drug conjugates
Promotores: H.S. Overkleeft, G.A. van der Marel, Co-Promotor: R.G. Boot
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Targeting of antigen-presenting cells with mannosylated conjugates
This thesis describes the development of a variety of mannosylated conjugates. Antigen presenting cells bear mannoside recognizing receptors that actively transport antigen into the cell. This thesis exploits this feature for the development of improved vaccines.
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Substrates and inhibitors to study and modulate ER-I α-glucosidase activity
This thesis describes research aimed at discovering inhibitors selective for either of the two endoplasmic reticulum α-glucosidases, ER-I and ER-II, with the overarching goal of discovering new antiviral agents to treat viruses that rely on host N-glycosylation for proliferation.
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Dark ice chemistry in interstellar clouds
This thesis is largely an experimental study on the formation of solid-state simple and complex organic molecules in the H2O-rich and CO-rich ice phases of dense interstellar clouds and dark cores.
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Design and development of conformational inhibitors and activity-based probes for retaining glycosidases
Glycosidases are essential in fundamental biological processes and are responsible for the degradation of most (oligo)saccharides, glycolipids and glycoproteins.
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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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Synthesis of well-defined ADP-Ribosylated biomolecules
Promotor: G. A. van der Marel, Co-promotor: D. V. Filippov
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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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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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Synthesis of Ribitol Phosphate based Wall Teichoic acids
Antibiotic resistance, caused by widespread use of antibiotics, leads to bacterial infections that are difficult, if not impossible, to treat and is a major worldwide health concern.
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Chemical synthesis of fragments of galactosaminogalactan and pel polysaccharides
The work described in this Thesis is focused on the assembly of oligosaccharide fragments derived from a fungal polysaccharide, galactosaminogalactan (GAG) and fragments of the exopolysaccharide Pel, generated by Pseudomonas aeruginosa.
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The development of molecular tools for investigating NAD+ metabolism and signalling
Nicotinamide adenine dinucleotide (NAD+) is the substrate used for the introduction of the ubiquitous and highly dynamic PTM in which either one or multiple adenosine diphosphate ribose (ADPr) moieties are covalently attached to a nucleophilic side chain of an specific amino acid in the target protein…
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Mechanism-based inhibitors and probes for neuraminidases
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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Synthesis of cyclic peptides as bioconjugation platforms
Cyclic peptides are investigated as a platform to induce different orientations between various ligands.
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Institute for Chemical Immunology
Overkleeft
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Chemische wapens: verboden, maar nog altijd politiek krachtig
Op OPCW-dag sprak Anneleen van der Meerin de podcast Vroeg! van NPO Radio 1 over de blijvende impact van chemische wapens.