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.

What are the flows of C&DW (e.g. bricks, concrete, gypsum and wood) in the case study countries ? How to define the specification for each material to be quantified? What indicators should be used to identify the pattern of each C&DW management system? How to interpret the MFA results in relation…

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.

Integrating life cycle assessment (LCA) with life cycle costing (LCC) offers the opportunity to simultaneously analyze the environmental and economic aspects of product alternatives, for the integration of which a unified computational has been proposed by Heijungs et al. (2013) [1]. The project aims…

De Vrouw Vennepolder bij Oud Ade is omgetoverd tot het Polderlab. Wetenschappers en studenten van de Universiteit Leiden onderzoeken hier samen met boeren en burgers hoe je veenweidegrond duurzaam en rendabel beheert. Een geweldige kans voor studenten om te ervaren hoe ze wetenschappelijke kennis kunnen…

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

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

Materials balances have been used in the recent past for the analysis of substance oriented environmental problems and the formulation of measures for environmental policy. In this study an integrated tool, based on the materials balance principle, has been developed for the analysis of both environmental…

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…

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.

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.

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.

The marine shipping industry is one of the strongest emitters of nitrogen oxides (NOx), a pollutant detrimental to ecology and human health. Over the last 20 years, the pollution produced by power plants, the industry sector, and cars has been decreasing.

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

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

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

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.

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…

Leidse wetenschappers onderzoeken de wereld om ons heen en geven hun kennis door aan toekomstige generaties. Zij geven gezicht aan de universiteit, ieder met zijn of haar individuele expertise en persoonlijke fascinatie voor het eigen vakgebied.

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…

Promotie

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.

Het was al de meest aangehaalde publicatie die ooit bij onze faculteit is geschreven, maar nu is een nieuwe mijlpaal bereikt. Een artikel van emeritus hoogleraar Jan Reedijk - en co-auteurs - ging afgelopen maand over de 10.000 citaties heen. En de teller tikt door.

Congres/symposium

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…