236 zoekresultaten voor “evolution ” in de Publieke website
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Artificial metallo-proteins for photocatalytic water splitting: stability and activity in artificial photosynthesis
Climate change is one of the largest challenges faced by humanity. To combat this research into alternatives to fossil fuels is ongoing. Dihydrogen is considered a good alternative fuel, since its burning only forms water.
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Cold gas in distant galaxies
The formation and evolution of galaxies is fundamentally driven by the formation of new stars out of cold gas.
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Distant star formation in the faint radio sky
One of the key quests in astronomy is to study the growth and evolution of galaxies across cosmic time. Radio observations provide a powerful means of studying the formation of stars and subsequent buildup of distant galaxies, in a way that is unbiased by the presence of dust.
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Design of homogeneous water oxidation catalysts
To design the ideal water oxidation catalyst, understanding of the catalytic mechanism and decomposition pathways is essential.
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Ben Wielstra
Wiskunde en Natuurwetenschappen
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Anagnostis Theodoropoulos
Wiskunde en Natuurwetenschappen
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Monsters in the Deep: Using simulations to understand the excess baryonic mass in the centres of high-mass, early-type galaxies
This thesis aims to enhance our understanding of galaxies by testing theoretical models of galaxy formation against observations, particularly in the cases of extreme systems which have been found to have an excess of baryonic mass in their central regions, in the form of either supermassive black holes…
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Early death of massive galaxies in the distant universe
Promotor: M. Franx, Co-Promotor: I.F. Labbé
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Neutral outflows in high-redshift dusty galaxies
Outflows are crucially important for the gas budget and evolution of luminous star-forming galaxies and AGNs, with observed mass outflow rates of the same order as the star formation rate. Greater star formation and black hole growth lead to more intense feedback and outflows, resulting in self-regulated…
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Hierarchical Systems
The thesis addresses the long-term dynamical evolution of hierarchical multiple systems.
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Dynamics of the Oort Cloud and Formation of Interstellar Comets Santiago Torres Rodriguez
The solar system was formed approximately 4.56 billion years ago. Despite the numerous theories that have been developed over the years, the formation and evolution of the solar system still remain unclear.
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From midplane to planets : the chemical fingerprint of a disk
This thesis addresses the chemical processes that determine the compositions of giant planet atmospheres.
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Star-Forming Galaxies at the Cosmic Dawn
Promotor: Prof.dr. M. Franx, Co-Promotor: Rychard Bouwens
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Substrate adaptability of β-lactamase
The research aims to explore the evolutionary adaptability of enzymes and the impact of temperature on protein evolution pathways, using M. tuberculosis β-lactamase BlaC as the object of study. Enzymes inherently embody a delicate balance between activity and stability, and the acquisition of new enzymatic…
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The Great Collapse
Promotor: Prof.dr. S.F. Portegies Zwart
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Simulating the birth environment of circumstellar discs
Circumstellar discs are the reservoirs of gas and dust that surround young stars and have the potential to become planetary systems.
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Isotopes and the characterization of extrasolar planets
Diverse types of exoplanets such as gas giants on close-in orbits (hot Jupiters) and young massive giants on wide orbits (super Jupiters), with no analogs in the Solar System, pose challenges but also opportunities to our understanding of planet formation and evolution.
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A radio view of dust-obscured star formation
Within the field of astronomy, understanding how galaxies grow and evolve from the Big Bang to the present day is a challenging and complex question.
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The distribution of stellar mass in galaxy clusters over cosmic time
Promotor: Prof.dr. K.H. Kuijken, Co-Promotor: H.Hoekstra
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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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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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De stad heeft een directe invloed op de evolutie
Een wereldwijd biologisch onderzoek heeft het meest directe bewijs tot nu toe geleverd dat mensen, en specifiek steden, de aanjager zijn van evolutionaire veranderingen op Aarde. De Universiteit Leiden, Naturalis en de gemeente Leiden droegen inhoudelijk en financieel bij aan de studie.
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Balanced lethal systems: een quick guide door Ben Wielstra
Ben Wielstra onderzoekt balanced lethal systems, waarin de helft van het nageslacht al voor de geboorte sterft. In vakblad Current Biology legt hij op toegankelijke wijze uit hoe zoiets nadeligs kan ontstaan in de natuur.
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NWA toekenning Hans Slabbekoorn voor onderzoek naar vis rondom windmolenparken in Noordzee
In het kader van de Nationale Wetenschapsagenda ontvangt gedragsbioloog Hans Slabbekoorn (Instituut Biologie Leiden) een beurs van 750.000 euro van NWO om met een consortium onderzoek te doen naar vissen en geluiden rondom windmolenparken in de Noordzee.
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Evolutionary diversification of coral-dwelling gall crabs (Cryptochiridae)
Promotor: Prof.dr. E Gittenberger, Co-Promotores: C.H.J.M. Fransen, B.W. Hoeksema
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Unveiling protostellar disk formation around low-mass stars
Promotor: Prof.dr. E.F. van Dishoeck
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The interplay between stars, gas and dust in faint star-forming galaxies
When observing star-forming galaxies, we are not only seeing stellar light, but we also see how this interacts with galactic gas and dust. This thesis contains studies of the stellar, nebular and dust properties of low mass star-forming galaxies.
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Geluidsvervuiling beïnvloedt zeeleven wereldwijd
Geluiden van menselijke activiteit in en rond de oceanen hebben impact op mariene soorten en ecosystemen via verandering van het akoestische klimaat onderwater. Hans Slabbekoorn van het Instituut Biologie Leiden pleit voor technische oplossingen om de geluidsoverlast te verminderen. Science review paper…
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Dynamics of a β-lactamase
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.
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Identifying the origins of galaxy formation
This thesis investigates how galaxies form and what diversifies the evolutionary histories of galaxies.
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Modeling interstellar bubbles: near and far
Promotor: Prof. dr. A.G.G.M. Tielens
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Merging galaxy clusters: probing magnetism and particle acceleration over cosmic time
In this thesis, I studied the origin and evolution of the non-thermal radiation in merging galaxy clusters.
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Samenwerkende bacteriën offeren zichzelf op voor kolonie
Net zoals mieren, termieten en bijen, werken sommige bacteriën ook samen in een groep. Daarbij is er sprake van een strikte taakverdeling, zodat de groep als geheel weerbaar is tegen gevaren van buitenaf. Onderzoekers hebben nu ontdekt dat een deel van sommige bacteriën zich wel heel erg in dienst stellen…
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Hulp tegen uitdroging? Gen laat plant verhouten
‘Dit was een ontdekking die we niet hadden zien aankomen,’ vertelt Remko Offringa, hoogleraar ontwikkelingsgenetica van planten. Vandaag publiceert hij in Current Biology een nieuwe functie van een veelzijdig gen: het maakt voor planten het verschil tussen een kruidachtige of een verhoute stengel.…
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From Star-formation to Recombination: Expanding our View of the Radio-Recombination-Line Universe
The origin and evolution of galaxies are closely tied to the cyclic feedback processes between stars and the interstellar medium (ISM).
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Tracing the journey of the sun and the solar siblings through the Milky Way
Supervisor: S.F. Portegies Zwart Co-Supervisor: A.G.A. Brown
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Orion's Dragon and Other Stories
Stellar feedback is a crucial ingredient in the evolution of galaxies.
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High-contrast imaging polarimetry of exoplanets and circumstellar disks
Understanding the formation and evolution of planetary systems is one of the most fundamental challenges in astronomy. To directly image and study young exoplanets and the circumstellar disks they form from, dedicated high-contrast imaging instruments are built.
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Radio galaxies near the epoch of reionisation
This thesis explores the theoretical and observational properties of distant massive galaxies that harbour active black holes in their centres and shine brightly at radio wavelengths.
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Sizing up protoplanetary disks
This thesis focuses on protoplanetary disks: flattened structures of gas and dust around young stars in which planets are expected to form and grow.
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Orchid mycorrhizal interactions: evolutionary trajectories and ecological variations
The mycorrhizal symbiosis is among the most widespread species interactions on Earth. This thesis focuses on orchid mycorrhiza, a unique mycorrhizal type that has caught scientists’ attention for centuries.
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The music of language: exploring grammar, prosody and rhythm perception in zebra finches and budgerigars
Promotor: C.J. ten Cate
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Clues from stellar catastrophes
Promotores: S.F. Portegies Zwart, E. M. Rossi
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Extremely loud & incredibly far: observing radio bright AGN into the cosmic dawn
In this thesis new methodologies are developed for the detection and systematic study of radio sources in the early universe. This allows us to gain a deeper understanding of the formation and evolution of galaxies, the activity of supermassive black holes, and the final phase transition of our universe:…
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Combining classic and novel tools in the study of Historical Collections of Chinese Materia Medica in the Netherlands
Chinese materia medica (CMM), comprising a diverse array of natural substances from plants, animals, and minerals, has been integral to Traditional Chinese Medicine (TCM) throughout history. This study investigates the dynamic evolution of CMM, noting shifts in species for improved therapeutic effects…
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Group benefits from genomic instability: a tale of antibiotic warriors in Streptomyces
Streptomyces are filamentous bacteria that produce more than two-thirds of known antibiotics.
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The holographic glass bead game: from superconductivity to time machines
Promotores: Prof.dr. J. Zaanen, Prof.dr. K.E. Schalm
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The Demographics of Protoplanetary Disks: from Lupus to Orion
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.
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Evolutionary diversification and historical biogeography of Orchidaceae in Central America with emphasis on Costa Rica and Panama
In this thesis, I targeted the orchid genus Lepanthes, one of the six genera of angiosperms that surpasses 1,000 species in the Neotropics, as a study model to investigate the evolutionary processes that promoted species diversifications.
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Evolutionary adaptability of β-lactamase: a study of inhibitor susceptibility in various model systems
β-Lactamases are enzymes that can break down β-lactam substrates, such as antibiotics, preventing the use of these antibiotics for the treatment of various infectious diseases. However, some compounds, β-lactamase inhibitors, can block these enzymes allowing for possible treatments using a combination…