The main research question of this thesis was: Can nitrogen cycling on dairy farms on peat soil in the Dutch Green Heart area be improved by adapting management to the nitrogen supply from soil and by using other grassland species and crops without affecting milk production?

The use of N fertilizers has increased worldwide in the past century. While this increased input of N has increased food productivity, it has also contributed to decreases in biodiversity, soil quality and environmental health, including increases in greenhouse gas emissions.

The elementary excitations of magnets are called spin waves, and their corresponding quasi-particles are known as magnons. The rapidly growing field of Magnonics aims at using them as information carriers in a new generation of electronic devices, (almost) free of electric currents.

This thesis comprises the development of reproducible synthesis procedures for two-dimensional materials (composed of boron, nitrogen and carbon) on different metallic surfaces.

Freshwater biodiversity has been threatened by eutrophication due to excessive nutrients in the environment. Releasing the freshwater species from such pressures requires efforts from industry and manufacturers to avoid emissions to vulnerable and high-risk regions.

Material circularity and energy efficiency are highly relevant and intertwined issues for the transition towards a carbon-neutral and circular built environment. In the Netherlands, the building sector has been rendered a priority towards a circular and low-carbon society.

Advanced sensing techniques require graphene with high quality and well-controlled surface chemistry.

Vinasse is a major by-product generated by the sugarcane biofuel industry. It is a source of microbes, nutrients and organic matter and often it is recycled as fertilizer.

Promotor: Prof.dr. H.V.J. Linnartz, Co-Promotores: S. Ioppolo, H.M. Cuppen

Planets are formed in disks of gas and dust around young stars.

De voedselproductie in Nederland is een economisch succes, maar heeft geleid tot veel milieuproblemen, waaronder stikstofvervuiling. Onlangs keurde de hoogste rechter het beleid af dat economische groei en vermindering van de stikstofverliezen combineerde. Hierdoor belandde het land in een stikstofcrisis.In…

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.

Hoe zorgen we beter voor boer en aarde? In S&D, het tijdschrift van de Wiardi Beckman Stichting, proberen hoogleraar Jan Willem Erisman (Centrum Milieuwetenschappen Leiden) en landbouweconoom Krijn Poppe (Raad voor de leefomgeving en infrastructuur) deze vraag te beantwoorden.

One of the key discoveries in exoplanet research over the past decade is the abundance of small planets in our Milky Way. Despite their high numbers, our understanding of their atmospheres remains limited, and it is unknown if they possess atmospheres at all.

The aromatic infrared bands (AIBs) seen throughout the interstellar medium (ISM) are generally thought to be carried by polycyclic aromatic hydrocarbons (PAHs) and their nitrogen analogues (PANHs).

Hot astrophysical plasma is ubiquitous in the Universe, from comets in our Solar system to the largest scale structures -- the cosmic web filaments. These hot plasmas, with the temperature of a few millions of degrees, are often observed in the X-ray wavelength range.

Catalysis is of extreme relevance in the production of everyday materials and plays a central role in many aspects of our life.

Streptomyces are prolific producers of enzymes and secondary metabolites, including more than 50% of all clinical antibiotics. This makes them highly attractive for medical, biotechnological, and industrial purposes.

Cell-based medicinal products (CBMPs), such as CAR T cells, are highly complex biopharmaceutical products offering various treatment options for serious illnesses such as cancer or autoimmune diseases.

A dense region of a gaseous and dusty cloud collapses to form a protostar surrounded by a disk and an envelope. This thesis uses both observations and models to study physical and chemical conditions of these protostellar systems which are likely where planets start to form.

There are many interpretations of quantum mechanics, and ultimately experiments are needed to verify or falsify these interpretations.

This thesis focuses on developing wafer-scale two-dimensional (2D) materials by combining synthesis, transfer, characterization, and device integration of graphene, hexagonal boron nitride (h-BN), and BN-doped amorphous carbon.

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…

Promotors: Prof.dr. G.R. de Snoo, Prof.dr. G.A. Persoon, Prof.dr.ir. H.H. de Iongh

Naar aanleiding van de explosie in Beirut maakte BBC podcastserie 'The Foodchain' een aflevering over de chemische stof die de explosie veroorzaakte: ammoniumnitraat. Deze stof wordt veelvuldig gebruik in kunstmest. Met Hoogleraar Environmental sustainability Jan Willem Erisman spraken ze over de effecten…

Zeven dagen stikstof-arm leven, op excursie naar een veeboerderij en telkens nieuwe gastdocenten. Zo zien de weken eruit van masterstudenten die sinds begin oktober het keuzevak Nitrogen & Sustainability volgen. Het doel? Een oplossing vinden voor het Nederlandse stikfstofprobleem.

Het is een team van onderzoekers gelukt om een enkel spinnend elektron te positioneren op een chip met een precisie van enkele nanometers. Hiermee ligt de weg open naar quantumchips met nano-elementen naar keuze. De resultaten zijn gepubliceerd in het gerenommeerde Applied Physics Letters.

Submissions are sought for a special issue with Frontiers in Political Science that explores the conceptual and practical aspects of a ‘just’ energy transition both within and beyond Europe. In particular, contributions to the theoretical and interdisciplinary foundations of just transitions, as well…

Het Europese project SUNRISE - ‘zonne-energie voor een circulair economie’, is geselecteerd als één van de zes Coördinatie- en Ondersteuningsacties (CSA) binnen het Horizon 2020-programma van de Europese Commissie. Het project ontvangt een subsidie van 1 miljoen euro en zal de basis leggen voor een…