1,865 zoekresultaten voor “organic chemisch” in de Publieke website
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Klein molecuul gaat uitzaaien tumorcellen tegen
Leidse chemici wisten met collega’s in York en Israël een molecuul te maken dat de weefselstructuur om een tumor heen steviger houdt. Zo kunnen losse tumorcellen niet zo makkelijk uitzaaien. De onderzoekers hebben al patent op het molecuul aangevraagd, maar gebruik hiervan bij patiënten is nog onzeker.…
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Eregalerij 2020
Ook in 2020 hebben veel van onze medewerkers en studenten mooie prijzen gewonnen en belangrijke onderzoekssubsidies binnengehaald.
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Eregalerij 2021
In 2021 hebben veel van onze medewerkers en studenten mooie prijzen gewonnen en belangrijke onderzoekssubsidies binnengehaald. Traditioneel blikken we aan het einde van het jaar en bij de start van het nieuwe jaar terug op deze successen.
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In memoriam Professor dr. Jan Cornelisse
Op 2 november jongstleden overleed, na een kort ziekbed, op 72-jarige leeftijd onze collega en goede vriend Jan Cornelisse.
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Ludo Juurlink
Digitale voortgangstoetsing als didactische methodiek.
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Gerard van Westen: 'Ons model voorspelt wat kandidaat-medicijnen doen in je lijf'
Hij praat snel en enthousiast. Logisch, want Gerard van Westen is als de machinist op een heel snelle trein. Het eindstation: een virtuele mens, bestaand uit algoritmen die voorspellen wat een toegediende stof doet in ons lichaam. De trein is al een heel eind op weg. De farmaceutische industrie is ook…
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Elektrolyse en de productie van brandstoffen
Een techniek om CO2 om te zetten in brandstoffen en andere nuttige producten, is elektrolyse. Om dit efficiënt en op grote schaal te kunnen doen, moeten we wel precies begrijpen hoe elektrolyse werkt. Hoogleraar Marc Koper is expert op dit gebied.
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Scheikunde
Betekenisvol scheikundeonderwijs
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Subsidie voor ontwikkeling kunstmatige groene brandstoffen
Onderzoekers van de Universiteit Leiden ontvangen een EU-subsidie van 4 miljoen euro voor het ontwikkelen van klimaatneutrale brandstoffen. Met dit geld gaan zij de brede onderzoeksgemeenschap die zich richt op groene energie verder uitbouwen. ‘Als we samen de schouders eronder zetten kunnen we de snelle…
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Vici-beurs voor Jeroen Codée: ‘Ik wil begrijpen hoe suikers vormen’
Veel biologen en medici gebruiken suikers in hun onderzoek, maar de synthese ervan is nog grotendeels onbegrepen. Jeroen Codée heeft een Vici-beurs van 1,5 miljoen euro gekregen om de productie van suikers op een systematische manier te onderzoeken. ‘Ik wil de reacties echt gaan begrijpen.’
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Nanodeeltjes – redox eiwit biohybriden
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…
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Studieverenigingen
De Faculteit der Wiskunde en Natuurwetenschappen heeft verschillende studieverenigingen, die zowel studiegerelateerde als sociale activiteiten organiseren voor studenten.
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Femke Reidsma naar Harvard met Rubiconsubsidie voor onderzoek vroeg vuurgebruik
Onderzoeker Femke Reidsma heeft een prestigieuze Rubiconsubsidie ontvangen. Met deze beurs zal zij twee jaar onderzoek doen aan Harvard University, waar zij aansluit bij een toonaangevend paleoecologisch laboratorium.
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Hoe bitterzoete suikerchemie ziekteverwekkers aanpakt
De uitdaging is groot, maar de voldoening als het lukt ook: complexe suikermoleculen maken die een rol spelen in de biologie.
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Chemical biology of glucosylceramide metabolism fundamental studies and applications for Gaucher disease
This thesis describes biochemical investigations of glucocerebrosidase (GBA), the lysosomal β- glucosidase that is deficient in Gaucher disease (GD).
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A computational study of structural and excitonic properties of chlorosomes
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…
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The role of water in hydrogen electrocatalysis
Promotor: M.T.M. Koper, Co-promotor: L. Juurlink
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Gold nanoparticle-peptide conjugates for biomedical applications
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.
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Exploring structure dependencies of gas-surface interactions with curved single crystals
Curved single crystals provide variable, but well-defined surface structures.
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Cathodic corrosion
Cathodic corrosion is a relatively unknown phenomenon that can severely etch metallic electrodes at cathodic (negative) potentials.
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Click-to-release for immune cell activation
This work describes the use of click-to-release chemistry to get spatiotemporal control over immunocytokine activity. Until now, immunocytokines (cytokines coupled to a tumor-targeting-moiety) remained active throughout the body, being able to bind their respective receptors, causing mild to severe…
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Discovery of novel inhibitors to investigate diacylglycerol lipases and α/β hydrolase domain 16A
Promotor: H.S. Overkleeft, Co-promotor: M. van der Stelt
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Iron complexes as electrocatalysts for the water oxidation reaction
In this dissertation, the synthesis and characterization of a series of iron complexes based on different ligand platforms are described.
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Water related adsorbates on stepped platinum surfaces
Promotor: M.T.M. Koper, Co-Promotor: L.B.F. Juurlink
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Steps in gas-surface reactions
Heterogeneous catalysis is essential to many industrial applications. These catalysts are often comprised of supported nanoparticles, which contain various different surface sites.
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Discovery of selective diacylglycerol lipase β inhibitors
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…
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Redox Interconversion between Metal Thiolate and Disulfide Compounds
In the last decade, the redox interconversion between metal thiolate and disulfide compounds has been extensively investigated for copper, but not for other transition metal ions.
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Fundamental research on the voltammetry of polycrystalline gold
Voltammetry plays a crucial role in modern scientific research by offering valuable insights into the electrochemical properties of materials, with wide-ranging applications in fields such as materials science, energy storage, corrosion studies, and sensor development.
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Mesoporous silica nanoparticle-based protein delivery systems for biomedical applications
Promotor: A. Kros
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Discovery of antibiotics and their targets in multidrug-resistant bacteria
Global healthcare is on the verge of an antibiotic availability crisis as bacteria have evolved resistance to nearly all known antibacterials. Identifying new antibiotics that operate via novel modes-of-action is therefore of high priority.
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The relation between dynamics and activity of phospholipase A/acyltransferase homologs
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.
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The optimization and scale-up of the electrochemical reduction of CO₂ to formate
Carbon dioxide capture and utilization technologies are necessary to create a truly circular economy. The electrochemical reduction of carbon dioxide to formate is an appealing carbon utilization method as it can be performed at room temperature and pressure, it only requires two electrons, and it has…
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Analytical chemistry and biochemistry of glycosphingolipids: new developments and insights
Advanced mass spectrometry of glycosphingolipids takes the central stage in this thesis. Investigations focus on characterization of glycosphingolipid metabolism in health and disease with emphasis to the detection and accurate quantitation of known and so far unknown glycosphingolipids and closely…
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Spatio-temporal aspects of antigen cross-presentation in dendritic cells: with click-to-release chemistry
The first steps are made in personalised cancer vaccination strategies, which aim to induce a more specific immune response with fewer side effects. The activation of cytotoxic T cells is crucial for an effective immune response.
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Electrochemical and surface studies of the effect of naphthalene-based additives on tin electrodeposition
Tin electrodeposition applications have rapidly evolved in the past 25 years.
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Coiled-coil mediated liposomal fusion: Asymmetric behaving peptide fusogens
Membrane fusion is a vital process in living organisms and is mediated by zipper-like proteins.
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Design and application of dextran based cross-linked networks
This thesis describes the design, characterization and application of dextran based crosslinked network.
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Biomimetic Copper Catalysts for the Electrochemical Oxygen Reduction Reaction
Human civilization consumes a huge amount of fossil fuels, which has resulted in an atmospheric CO2 level which has not been higher in over 800 millennia.
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Vervolgopleidingen
Na het afronden van de bacheloropleiding volgen verreweg de meeste studenten de masteropleiding. De Universiteit Leiden stimuleert studenten om na hun bacheloropleiding door te gaan met de masteropleiding.
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Caging ruthenium complexes with non-toxic ligands for photoactivated chemotherapy
The main goal of the research described in this thesis was the development of new photoactivated chemotherapy (PACT) ruthenium(II) complexes bearing a non-toxic photolabile ligand.
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Interaction of oxygen and carbon monoxide with Pt(111) at intermediate pressure and temperature: revisiting the fruit fly of surface science
Promotor: M.T.M. Koper, Co-promotors: A.I. Yanson, L.B.F. Juurlink
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Advancing image-based localization of lipid-based nanomedicines for the exploration of targeted drug delivery
Microscopic insight on lipid-based nanomedicine in vivo remains limited to the perception of the knowledge that could be obtained: if we interpret only what we see, then we only believe to know. Although believing to know encapsulates an undefined amount of uncertainty in the exploration of lipid-based…
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Platinum surface instabilities and their impact in electrochemistry
Hydrogen fuel cells are expected to be pivotal in the energetic transition towards renewable energy sources such as solar and wind power. However, their industrial scalability is severely hindered by the high cost and degradation rate of platinum catalysts, one of their key components. Addressing this…
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A chemical biology approach to explore lipid metabolism in neurological disorders
Neurodegenerative diseases pose a large medical and societal challenge. The etiology of these diseases is still poorly understood, which makes drug discovery for these diseases difficult.
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Kinetic and Non-Kinetic Effects for the Alkaline Oxygen Evolution Reaction on NiFeOOH Electrocatalysts
Green hydrogen is produced via a process called water electrolysis. During electrolysis water is split into oxygen and hydrogen.
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Proton transport through non-covalently functionalized graphene
Single-layer graphene (SLG) has attracted considerable interest as a proton exchange membrane for direct methanol fuel cells (DMFCs), owing to its atomic thickness, mechanical robustness, and unique proton permeability.
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Operando Spectro-electrochemical investigations of Pt and Pt-alloys as Fuel Cell Catalysts
The overall theme of this thesis is to complement the electrochemical data acquired in fuel cell research with in situ X-ray photoelectron spectroscopy (XPS) and soft X-ray absorption spectroscopy (XAS).
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CellEKT: a chemical proteomics platform to study the kinome
Kinase inhibitors are key therapeutic agents, particularly in oncology, yet their clinical efficacy is often hampered by off-target effects and limited understanding of their cellular target profiles.
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Stereoelectronic and conformational effects in oxocarbenium, iminium and iminosugar ammonium ions
Promotor: G.A. van der Marel, Co-promotor: J.D.C. Codée
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Determination of surface formation energies on curved single crystals from STM images
In this thesis, we study different curved single crystals because of the diversity of surface structures across their curvature.