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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    A greenhouse climate-yield model focussing on additional light, heat harvesting and its validation
    Righini, Isabella ; Vanthoor, Bram ; Verheul, Michèl J. ; Naseer, Muhammad ; Maessen, Henk ; Persson, Tomas ; Stanghellini, Cecilia - \ 2020
    Biosystems Engineering 194 (2020). - ISSN 1537-5110 - p. 1 - 15.
    Climate model - Crop-yield model - Heat harvesting technology - Secondary heating system - Supplementary lighting - Tomato

    A greenhouse climate-crop yield model was adapted to include additional climate modification techniques suitable for enabling sustainable greenhouse management at high latitudes. Additions to the model were supplementary lighting, secondary heating and heat harvesting technologies. The model: 1) included the impact of different light sources on greenhouse air temperature and tomato production 2) included a secondary heating system 3) calculated the amount of harvested heat whilst lighting was used. The crop yield model was not modified but it was validated for growing tomato in a semi-closed greenhouse equipped with HPS lamps (top-lights) and LED (inter-lights) in Norway. The combined climate-yield model was validated with data from a commercial greenhouse in Norway. The results showed that the model was able to predict the air temperature with sufficient accuracy during the validation periods with Relative Root Mean Square Error <10%. Tomato yield was accurately simulated in the cases under investigation, yielding a final production difference between 0.7% and 4.3%. Lack of suitable data prevented validation of the heat harvest sub-model, but a scenario is presented calculating the maximum harvestable heat in an illuminated greenhouse. Given the cumulative energy used for heating, the total amount of heating pipe energy which could be fulfilled with the heat harvestable from the greenhouse air was around 50%. Given the overall results, the greenhouse climate(-crop yield) model modified and presented in this study is considered accurate enough to support decisions about investments at farm level and/or evaluate beforehand the possible consequences of environmental policies.

    Datastewardship op de kaart : Een verkenning van taken en rollen in Nederlandse onderzoeksinstellingen
    Verheul, Ingeborg ; Imming, Melanie ; Ringersma, Jacquelijn ; Mordant, Annemie ; Ploeg, Jan Lucas van der; Pronk, Martine - \ 2019
    Utrecht : LCRDM - 32 p.
    Goed onderzoek vereist goed datastewardship. Datastewardship staat voor het geheel van verschillende taken en verantwoordelijkheden dat betrekking heeft op de zorg voor data, gedurende de verschillende fases van de gehele research life cycle. Uitgangspunt hierbij is dat de onderzoeker zelf primair verantwoordelijk is voor alle data.2 Deze onderzoeker heeft daarbij echter wel behoefte aan professionele ondersteuning. Zodoende zijn de afgelopen jaren diverse ondersteunende datastewardshiprollen en -functies ontstaan. Vaak zijn deze historisch gegroeid. De invulling ervan hangt sterk af van de plek in de organisatie. Dat is niet verwonderlijk, aangezien het geheel van datastewardship bestaat uit vele facetten die traditioneel bij verschillende afdelingen zijn ondergebracht. Ook nemen onderzoekers vaak nog datastewardshiptaken op zich, niet alleen voor zichzelf maar ook voor een bredere onderzoeksgroep. Deze vorm van datastewardship is vaak onzichtbaar.
    Data stewardship on the map : A study of tasks and roles in Dutch research institutes
    Verheul, Ingeborg ; Imming, Melanie ; Ringersma, Jacquelijn ; Mordant, Annemie ; Ploeg, Jan Lucas van der; Pronk, Martine - \ 2019
    Utrecht : LCRDM - 32 p.
    Good research requires good data stewardship. Data stewardship encompasses all the different tasks and responsibilities that relate to caring for data during the various phases of the whole research life cycle. The basic assumption is that the researcher himself/herself is primarily responsible for all data.2 However, the researcher does need professional support to achieve this. To that end, diverse supportive data stewardship roles and functions have evolved in recent years. Often they have developed over the course of time. Their functional implementation depends largely on their place in the organization. This comes as no surprise when one considers that data stewardship consists of many facets that are traditionally assigned to different departments. Researchers regularly take on data stewardship tasks as well, not only for themselves but also in a wider context for a research group. This data stewardship work often remains unnoticed.
    Landelijk Coördinatiepunt Research Data Management Poditionering paper voor 2019 en verder
    Verheul, Ingeborg ; Mordant, Annemie ; Ringersma, J. ; Sesink, Laurents ; Smeele, Ton ; Boiten, Jan Willem ; Bouwhuis, Maurice ; Dunning, Alastair ; Branchett, Susan ; Bijsterbos, Machiel ; Hoeksema, Bolinde ; Selm, Mariette van; Hoogen, Henk van der; Gankema, Hans ; Verheij, Marijke - \ 2019
    Research Data Management
    Sediment provenance, soil development, and carbon content in fluvial and manmade terraces at Koiliaris River Critical Zone Observatory
    Moraetis, Daniel ; Paranychianakis, Nikolaos V. ; Nikolaidis, N.P. ; Banwart, S.A. ; Rousseva, S. ; Kercheva, M. ; Nenov, Martin ; Shishkov, T. ; Ruiter, P.C. de; Bloem, J. ; Blum, W.E.H. ; Lair, G.J. ; Gaans, Pauline van; Verheul, M. - \ 2015
    Journal of Soils and Sediments 15 (2015)2. - ISSN 1439-0108 - p. 347 - 364.
    The purpose of this study was the investigation of sediment provenance and soil formation processes within a Mediterranean watershed (Koiliaris CZO in Greece) with particular emphasis on natural and manmade terraces. Material and methods Five sites (K1–K5) were excavated and analyzed for their pedology (profile description), geochemistry [including rare earth elements (REEs) and other trace elements], texture, and mineralogy along with chronological analysis (optical luminescence dating). The selected sites have the common characteristic of being flat terraces while the sites differed with regard to bedrock lithology, elevation, and land use. Results and discussion Three characteristic processes of soil genesis were identified: (1) sediments transportation from outcrops of metamorphic rocks and sedimentation at the fluvial sites (K1–K2), (2) in situ soil development in manmade terraces (K3, K4), and (3) strong eolian input and/or material transported by gravity from upslope at the mountainous site (K5). REE patterns verified the soil genesis processes while they revealed also soil development processes such as (a) calcite deposition (K1), (b) clay illuviation and strong weathering (K4), and (c) possibly fast oxidation/precipitation processes (K3). Carbon sequestration throughout the soil profile was high at manmade terraces at higher elevation compared to fluvial environments due to both climatic effects and possibly intensive anthropogenic impact. Conclusions Soils at Koiliaris CZO were rather young soils with limited evolution. The different soil age, land use, and climatic effect induced various soil genesis and soil development processes. The manmade terraces at higher elevation have much higher carbon sequestration compared to the anthropogenic impacted fluvial areas.
    Vogels op Jan Mayen
    Camphuysen, K. ; Bemmelen, R.S.A. van - \ 2015
    In: Met de Zr.Ms. Zeeland op expeditie naar Jan Mayen / Hacquebord, L., Postma, E., Verheul, E., Groningen : Barkhuis - ISBN 9789491431869 - p. 36 - 39.
    Een zeereis naar het hoge noorden; walvissen en zeevogels onderweg
    Camphuysen, K. ; Bemmelen, R.S.A. van - \ 2015
    In: Met de Zr. Ms. Zeeland op expeditie naar Jan Mayen / Hacquebord, L., Postma, E., Verheul, E., Groningen : Barkhuis - ISBN 9789491431869 - p. 30 - 35.
    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
    'Teelt tomaat naast algen aantrekkelijk"
    Verheul, J. ; Hemming, S. - \ 2013
    Tracing the spatial propagation of river inlet water into an agricultural polder area using anthropogenic gadolinium
    Rozemeijer, J. ; Siderius, C. ; Verheul, M. ; Pomarius, H. - \ 2012
    Hydrology and Earth System Sciences 16 (2012)8. - ISSN 1027-5606 - p. 2405 - 2415.
    watervoorziening - rivierwater - watertekort - zoet water - waterkwaliteit - landbouwgrond - tracer technieken - zeldzame aardelementen - nutriëntenstromen - water supply - river water - water deficit - fresh water - water quality - agricultural land - tracer techniques - rare earth elements - nutrient flows - quality - impact - irrigation - hydrology - nitrogen
    Diverting river water into agricultural areas or nature reserves is a frequently applied management strategy to prevent fresh water shortage. However, the river water might have negative consequences for chemical and ecological water quality in the receiving water bodies. This study aimed to obtain a spatial image of the diverted river water propagation into a hydrologically complex polder area, the polder Quarles van Ufford in The Netherlands. We used anthropogenic gadolinium (Gd-anomaly) as a tracer for river water that was diverted into the polder. A clear reduction in the river water contribution was found between very dry conditions on 5 August 2010 and very wet conditions on 22 October. Despite the large river water impact on 5 August, the diverted river water did not propagate up into the small agricultural headwater ditches. Gadolinium proved to be an effective tracer for diverted river water in a polder system. We applied our results to upgrade the interpretation of water quality monitoring data and to validate an integrated nutrient transport model
    Verspreiding inlaatwater in beeld met nieuwe tracer : Gadolinium-metingen voor een betere interpretatie monitoringgegevens
    Rozemeijer, J. ; Siderius, C. ; Verheul, M. ; Pomarius, H. - \ 2011
    Verspreiding inlaatwater in beeld met nieuwe tracer
    Rozemeijer, J. ; Siderius, C. ; Verheul, M. ; Pomarius, H. - \ 2011
    H2O : tijdschrift voor watervoorziening en afvalwaterbehandeling 12 (2011). - ISSN 0166-8439 - p. 33 - 35.
    oppervlaktewaterkwaliteit - tracers - tracer technieken - nieuwe producten - nutriëntenstromen - watersystemen - hydrologie van stroomgebieden - maas - land van maas en waal - surface water quality - tracers - tracer techniques - new products - nutrient flows - water systems - catchment hydrology - river meuse - land van maas en waal
    Inlaatwater heeft in de polder Quarles van Ufford zelfs in een droge periode geen invloed op de waterkwaliteit van kleine landbouwsloten. Dat blijkt uit metingen van de concentratie gadolinium, die zijn uitgevoerd voor het project Monitoring Stroomgebieden. Hiermee komt voor dit gebied een einde aan de twijfel over de invloed van inlaatwater op de oppervlaktewaterkwaliteit en is er meer duidelijkheid over de belasting vanuit de landbouw.
    WUR laat zien wat het kan op Britse tuinenshow : Interview met Filip van Noort
    Verheul, J. ; Noort, F.R. van - \ 2011
    Agrarisch dagblad (2011). - ISSN 1380-6335 - p. 15 - 15.
    Komkommerplanten voor proef met dubbel glas
    Verheul, J. ; Wageningen UR Glastuinbouw, - \ 2010
    Agrarisch dagblad (2010). - ISSN 1380-6335 - p. 11 - 11.
    Robot Wageningen UR test tomatensmaak
    Verheul, J. ; Wageningen UR Glastuinbouw, - \ 2010
    Boerderij vandaag (2010). - p. 13 - 13.
    Nieuwe schimmel peer gezocht in kist
    Verheul, J. ; Schaik, A.C.R. van - \ 2010
    Agrarisch dagblad (2010). - p. 11 - 11.
    Gezondheidsclaim Santana kan teelt impuls geven : Interview met Rien van der Maas
    Verheul, J. ; Maas, M.P. van der - \ 2010
    Agrarisch dagblad (2010). - ISSN 1380-6335 - p. 13 - 13.
    Ecosysteemdiensten rukken op. Hype of hulpmiddel?
    Verheul, J. ; Smit, A. ; Wagelmans, M. - \ 2010
    Milieu : opinieblad van de Vereniging van Milieuprofessionals 2010 (2010)1. - ISSN 1873-5436 - p. 38 - 39.
    Gezond eten en bewegen : samen lukt het
    Verheul, M. ; Wagemakers, A. - \ 2009
    Gezond VGZ Magazine 2009 (2009)22. - p. 17 - 17.
    Onderzoek naar variatie stammen pepinomozaïek
    Verheul, J. ; Wageningen UR Glastuinbouw, - \ 2009
    Agrarisch dagblad (2009). - ISSN 1380-6335 - p. 11 - 11.
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