This database contains bibliographic descriptions of all Wageningen University PhD theses from 1920 onwards. It is updated on a daily basis by WUR Library.
Author abstracts and/or summaries are added to all descriptions. A link to the full text dissertation is added to the bibliographic description. In a few cases, no electronic version is available, mostly because of copyright issues.
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Abstract: Cum laude graduation Among the factors hindering the conservation of crop genetic resources is a lack of essential information regarding this diversity. Questions include: (a) what is the status of diversity in our food systems, and where are the greatest vulnerabilities?, (b) where can genetic diversity be found that can be useful in increasing productivity and mitigating these vulnerabilities?, (c) is this genetic diversity available in the present and in the long term?, and (d) what steps are needed to improve the ability for researchers to access genetic resources critical for present and future crop improvement? This thesis aims to contribute to the knowledge required to answer these questions through an exploration of the need for, potential of, challenges and constraints regarding, and necessary steps to enhance the conservation and use of crop genetic diversity.
biodiesel - biomass - family farms - crops - crop production - policy - sustainability - helianthus annuus - brazil - biofuels - biobased economy
Abstract: In Brazil, a biodiesel policy was implemented as a way of reducing poverty among family farms. The objective of this thesis is to perform an integrated assessment of biodiesel crops, farm types, biodiesel policies and producer organisations that reveals opportunities and limitations of family farmers’ engagement in the biodiesel supply chain.
Abstract: Feminisation of male fish is for a large part due to compounds entering surface waters via wastewater. For domestic wastewater, two natural estrogens, estrone and 17-estradiol and the synthetic estrogen, constituent of the contraceptive pill, are mainly responsible for this effect. These compounds are excreted by humans and in conventional treatment systems sometimes insufficiently removed. A solution can be found in the implementation of innovative sanitation concepts like source separated collection and treatment of black water (toilet), grey water (shower, kitchen, laundry) and rain. As the three compounds will be mainly present in black water, contamination by storm water overflows is completely excluded and the concentrated character of the wastewater allows for more energy efficient treatment systems. Present research showed the first step, anaerobic treatment where energy is as well produced as conserved, is unfavourable to satisfactory remove these compounds and the aerobic post-treatment only partly. As the volume of the stream is remarkably smaller compared to conventional systems (7 liter black water per person per day against 200 liter wastewater per person per day), a necessary tertiary treatment, for which ozonation is promising, will be more compact. Besides, current research shed light on several parameters influencing the degradation of estrogens in biological systems
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