Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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    Tomaten telen in een Chinese muurkas, in Nederland en in China
    Zwart, Feije de - \ 2018
    Bleiswijk : Wageningen University & Research, BU Glastuinbouw (Rapport WPR 778) - 26
    Gloablly, the largest area of protected cultivation consists of small scale greenhouses growing crops at a low technology level. The Chinese Solar Greenhouse is a good example of such greenhouses. Also in this market, Dutch horticultural and technological knowledge can contribute substantially to an improvement of the cropping result and resource efficiency.This report describes the monitoring of the performance of a tomato crop in a Chinese Solar Greenhouse in the Shandong Province and a comparison with a similar crop in a similar greenhouse in Bleiswijk, the Netherlands. The project is carried out by a consortium consisting of Ludvig Svensson, Ridder–Hortimax, Hoogendoorn, Delphy and Wageningen University & Research, Business unit Glastuinbouw. The project was funded by the Rijksdienst Voor Ondernemend Nederland (RVO) and the Metropole region Rotterdam Den Haag (MRDH).The project has shown that also for simple greenhouses like the Chinese Solar Greenhouse the growth of the crop can be planned as a function of light availability. This analyses showed that the production is likely to be increased by 50% if the growth at the start of the cycle is accelerated. This can be achieved by earlier sowing and using white soil covering foil.
    Evolution and diversity of biosynthetic gene clusters in Fusarium
    Hoogendoorn, Koen ; Barra, Lena ; Waalwijk, Cees ; Dickschat, Jeroen S. ; Lee, Theo A.J. van der; Medema, Marnix H. - \ 2018
    Frontiers in Microbiology 9 (2018). - ISSN 1664-302X
    Ancestral state reconstruction (ASR) - Biosynthetic gene cluster - Fusarium - Koraiol - Supernumary chromosome

    Plant pathogenic fungi in the Fusarium genus cause severe damage to crops, resulting in great financial losses and health hazards. Specialized metabolites synthesized by these fungi are known to play key roles in the infection process, and to provide survival advantages inside and outside the host. However, systematic studies of the evolution of specialized metabolite-coding potential across Fusarium have been scarce. Here, we apply a combination of bioinformatic approaches to identify biosynthetic gene clusters (BGCs) across publicly available genomes from Fusarium, to group them into annotated families and to study gain/loss events of BGC families throughout the history of the genus. Comparison with MIBiG reference BGCs allowed assignment of 29 gene cluster families (GCFs) to pathways responsible for the production of known compounds, while for 57 GCFs, the molecular products remain unknown. Comparative analysis of BGC repertoires using ancestral state reconstruction raised several new hypotheses on how BGCs contribute to Fusarium pathogenicity or host specificity, sometimes surprisingly so: for example, a gene cluster for the biosynthesis of hexadehydro-astechrome was identified in the genome of the biocontrol strain Fusarium oxysporum Fo47, while being absent in that of the tomato pathogen F. oxysporum f.sp. lycopersici. Several BGCs were also identified on supernumerary chromosomes; heterologous expression of genes for three terpene synthases encoded on the Fusarium poae supernumerary chromosome and subsequent GC/MS analysis showed that these genes are functional and encode enzymes that each are able to synthesize koraiol; this observed functional redundancy supports the hypothesis that localization of copies of BGCs on supernumerary chromosomes provides freedom for evolutionary innovations to occur, while the original function remains conserved. Altogether, this systematic overview of biosynthetic diversity in Fusarium paves the way for targeted natural product discovery based on automated identification of species-specific pathways as well as for connecting species ecology to the taxonomic distributions of BGCs.

    Een nieuwe en handzame lysimeter: eerste stap naar een nationaal netwerk voor de werkelijke verdamping?
    Voortman, Bernard ; Witte, J.P. ; Rheenen, Hans van; Bosveld, F. ; Elbers, J.A. ; Bolt, F.J.E. van der; Heijkers, J. ; Hoogendoorn, Jan ; Bolman, A. ; Spek, T. ; Voogt, M. - \ 2016
    Stromingen : vakblad voor hydrologen 22 (2016)2. - ISSN 1382-6069 - p. 49 - 63.
    hydrologie - neerslag - waterbalans - grondwater - lysimeters - evaporatie - hydrology - precipitation - water balance - groundwater - lysimeters - evaporation
    Vrijwel overal op aarde verdampt meer dan de helft van het neerslagwater, ook in Nederland. Toch wordt deze grote verliespost in ons land slechts sporadisch gemeten. Door inspanningen van kennisinstituten, bedrijven en overheid is daarom een lysimeter ontwikkeld. Metingen in 2014 en 2015 op twee locaties vertonen opvallende verschillen, maar ook grote overeenkomsten, met eddy-correlatiemetingen. Schattingen van de verdamping via satellietdata zijn hoger dan de metingen. Tijd daarom, om metingen in het veld te combineren met modellen en waarnemingen vanuit de ruimte
    Chinese – Dutch cooperation on the Chinese Solar Greenhouse experiment in Shouguang
    Zwart, H.F. de - \ 2016
    Bleiswijk : Wageningen UR Greenhouse Horticulture (Report GTB 1399) - 58
    The Chinese Solar Greenhouse is simple but has a low productivity. To improve this, the inner greenhouse climate will have to become more controllable. To contribute to this, but keeping the passive character of the greenhouse, meaning that it doesn’t need additional heating, the Chinese Academy of Agricultural Science has developed the Active Heat Storage and Release System (AHSRS). By switching on and off a pump that runs water along large panels along the north wall the gathering of heat and the release of heat can be controlled. This project shows that the AHSRS does not affect the diurnal average temperature in winter, but can elevate the minimum temperature by some 2 °C. On dull days, however, the AHSRS doesn’t give an improvement since it doesn’t add anything to the shortage of energy. The fact that the Chinese Solar Greenhouse prevents frost, despite outside temperatures that may go down far below ‑10 °C is largely due to the high insulation applied. The insulation can be further increased by using screens inside the greenhouse. This project shows that such a screen may elevate the temperatures on the coldest days with about 1.5 °C and in Chinese Solar Greenhouse with the AHSRS even slightly more. When using a transparent screen like the Ludvig Svensson Luxous screen, the elevated temperature in winter comes together with a slightly increased amount of light entering the greenhouse. In warmer months of the year, the light entrance to the greenhouse will be reduced somewhat when using a thermal screen. Apart from temperature, also the humidity is often unfavourably high in the Chinese Solar Greenhouse. This report shows a simple system to reduce the high humidities in winter at the expense of about 7 kWh/m² of electricity per year. Another topic studied in this project was the use of soilless cultivation. The equipment, consisting of a irrigation and nutrient supply system, drippers and coco fiber slabs, worked well and contributed to a good an healthy crop. To achieve this, the greenhouse operator was helped a lot by the Delphy advisory service. The control of all actuators and measurement of the greenhouse and outside climate was carried out by the Hoogendoorn ISII greenhouse climate computer. After a short period the operator of the greenhouse learned how to use the outputs of the climate computer and its control capabilities to realize the best possible climate with the given, limited number of control possibilities of a Chines Solar Greenhouse. The harvest in terms of tomatoes in this first experimental period was about 5.5 kg/m². This is still very low, but largely due to the start-up character of this first year. It is stated that a production of 20 kg/m² is reasonable to expect, providing a good support by a knowledgeable adviser.
    In 2050 meer plastic dan vis in oceaan
    Franeker, Jan Andries van - \ 2016
    Agent-Based Modeling of Farming Behavior: A Dutch Case Study on Milk Quota Abolishment and Sustainable Dairying
    Oudendag, D.A. ; Hoogendoorn, M. ; Jongeneel, R.A. - \ 2014
    In: Paper presented at the 27th International Conference on Industrial Engineering and Other Applications of Applied Intelligent Systems, IEA/AIE. - LEI, WUR - ISBN 9783319074542 - p. 11 - 20.
    Duurzame gewasbescherming roos in 2020 : Kennisdeling in de praktijk - Eindrapport
    Klein, E. ; Hoogendoorn, M. ; Buurma, J.S. - \ 2013
    Zoetermeer : Productschap Tuinbouw - 32
    gewasbescherming - geïntegreerde bestrijding - duurzaamheid (sustainability) - rozen - tuinbouw - sociale netwerken - gedragsveranderingen - plant protection - integrated control - sustainability - roses - horticulture - social networks - behavioural changes
    Doel van dit project is het bewerkstelligen van verminderen van milieubelasting door effectiever gebruik van middelen en methoden en kennishiaten opheffen rondom gewasbescherming middels netwerken en onafhankelijke kennisdeling (digitaal handboek geïntegreerde gewasbescherming Roos). Dit moet mede leiden tot gedragsverandering bij telers.
    Colocalization and interaction between elongasome and divisome during a preparative cell division phase in Escherichia coli
    Ploeg, R. van der; Verheul, J. ; Vischer, N.O.E. ; Alexeeva, S.V. ; Hoogendoorn, E. ; Postma, M. ; Banzhaf, M. ; Vollmer, W. ; Blaauwen, T. den - \ 2013
    Molecular Microbiology 87 (2013)5. - ISSN 0950-382X - p. 1074 - 1087.
    penicillin-binding-proteins - resonance energy-transfer - bacterial actin mreb - peptidoglycan synthesis - septal ring - caulobacter-crescentus - fluorescent proteins - lateral wall - ftsi pbp3 - membrane
    The rod-shaped bacterium Escherichia coli grows by insertion of peptidoglycan into the lateral wall during cell elongation and synthesis of new poles during cell division. The monofunctional transpeptidases PBP2 and PBP3 are part of specialized protein complexes called elongasome and divisome, respectively, which catalyse peptidoglycan extension and maturation. Endogenous immunolabelled PBP2 localized in the cylindrical part of the cell as well as transiently at midcell. Using the novel image analysis tool Coli-Inspector to analyse protein localization as function of the bacterial cell age, we compared PBP2 localization with that of other E.¿coli cell elongation and division proteins including PBP3. Interestingly, the midcell localization of the two transpeptidases overlaps in time during the early period of divisome maturation. Försters Resonance Energy Transfer (FRET) experiments revealed an interaction between PBP2 and PBP3 when both are present at midcell. A decrease in the midcell diameter is visible after 40% of the division cycle indicating that the onset of new cell pole synthesis starts much earlier than previously identified by visual inspection. The data support a new model of the division cycle in which the elongasome and divisome interact to prepare for cell division
    FormClimate Aircokas (FCA): Verslag van een ontwikkelingstraject van een apparaat voor buitenluchttoevoer en kasluchtcirculatie bij Het Nieuwe Telen
    Weel, P.A. van; Kouwenhoven, A. ; Troost, R. ; Voogt, J.O. - \ 2012
    Bleiswijk : Wageningen UR Glastuinbouw (Rapporten WUR GTB 1172) - 30
    warmtewisselaars - kastechniek - kassen - glastuinbouw - heat exchangers - greenhouse technology - greenhouses - greenhouse horticulture
    Het Nieuwe Telen vraagt om een goedkope, energiezuinige en betrouwbare warmtewisselaar waarmee buitenlucht aan de gevel kan worden opgewarmd tot kasluchttemperatuur. Een dergelijk systeem is in samenwerking met Formflex en Hoogendoorn Growth Management ontwikkeld en getest. De prestaties van een volledig uit kunststof bestaand systeem, de Formclimate Aircokas (FCA), bleek ruimschoots aan de vooraf opgestelde eisen te voldoen. Ook voor koeling van gesloten kassen of voor toepassing van lage temperatuur warmtebronnen, zoals aardwarmte of warmtepompen, is dit systeem zeer geschikt.
    Masterclass Het Nieuwe Telen
    Kempkes, Frank - \ 2011
    Masterclass Het Nieuwe Telen
    Kempkes, Frank - \ 2011
    Masterclass Het Nieuwe Telen (HNT) en microklimaat
    Kempkes, Frank - \ 2011
    Het Nieuwe Telen bij vruchtgroenten
    Raaphorst, Marcel - \ 2011
    Increasing weaning age of piglets from 4 to 7 weeks reduces stress, increases post-weaning feed intake but does not improve intestinal functionality
    Meulen, J. van der; Koopmans, S.J. ; Dekker, R.A. ; Hoogendoorn, A. - \ 2010
    Animal 4 (2010)10. - ISSN 1751-7311 - p. 1653 - 1661.
    enterotoxigenic escherichia-coli - net absorption - crypt depth - weaned pigs - villus height - performance - consequences - morphology - responses - behavior
    This study tested the hypothesis that late weaning and the availability of creep feed during the suckling period compared with early weaning, improves feed intake, decreases stress and improves the integrity of the intestinal tract. In this study with 160 piglets of 16 litters, late weaning at 7 weeks of age was compared with early weaning at 4 weeks, with or without creep feeding during the suckling period, on post-weaning feed intake, plasma cortisol (as an indicator of stress) and plasma intestinal fatty acid binding protein (I-FABP; a marker for mild intestinal injury) concentrations, intestinal morphology, intestinal (macro)molecular permeability and intestinal fluid absorption as indicators of small intestinal integrity. Post-weaning feed intake was similar in piglets weaned at 4 weeks and offered creep feed or not, but higher (P <0.001) in piglets weaned at 7 weeks with a higher (P <0.05) intake for piglets offered creep feed compared with piglets from whom creep feed was witheld. Plasma cortisol response at the day of weaning was lower in piglets weaned at 7 weeks compared with piglets weaned at 4 weeks, and creep feed did not affect cortisol concentration. Plasma I-FABP concentration was not affected by the age of weaning and creep feeding. Intestinal (macro)molecular permeability was not affected by the age of weaning and creep feeding. Both in uninfected and enterotoxigenic Escherichia coli-infected small intestinal segments net fluid absorption was not affected by the age of weaning or creep feeding. Creep feeding, but not the age of weaning, resulted in higher villi and increased crypt depth. In conclusion, weaning at 7 weeks of age in combination with creep feeding improves post-weaning feed intake and reduces weaning stress but does not improve functional characteristics of the small intestinal mucosa
    Emissiemanagement grondgebonden teelten (Glastuinbouw Waterproof - Grondgebonden)
    Voogt, W. - \ 2010
    emissie - nutrientenbeheer - gewasbescherming - pesticiden - waterbeheer - emission - nutrient management - plant protection - pesticides - water management
    Het doel van het op deze poster gepresenteerde onderzoek is vermindering emissie nutriënten en gewasbeschermingsmiddelen, via 1) Verbetering watermanagement / bemestingsstrategie; 2) Ontwikkeling technische hulpmiddelen; 3) Ontwikkelen / formuleren ‘best practices’. Teler instrumentarium geven om emissie zelf te kunnen beheersen
    Masterclass klimaatbeheersing; Ontvochtigen met buitenlucht en microklimaat
    Kempkes, Frank - \ 2010
    Presentatie tijdens Masterclass Luchtbehandeling voor phalaenopsiskwekers, georg. door Hoogendoorn Growth Management
    Kempkes, Frank - \ 2009
    Presentatie tijdens Masterclass Klimaatbeheersing, georg. door Hoogendoorn Growth Management
    Kempkes, Frank - \ 2009
    Ontvochtigen met buitenlucht
    Kempkes, Frank - \ 2009
    Weaning at 4 or 7 weeks: consequences for intestinal function and growth
    Meulen, J. van der; Koopmans, S.J. ; Dekker, R.A. ; Hoogendoorn, A. - \ 2007
    In: Digestive physiology of pigs : proceedings of the 8th Symposium, Uppsala, Sweden, June 2000. - New York : CABI - ISBN 9780851995175 - p. 140 - 142.
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