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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Using 'omic approaches to compare temporal bacterial colonization of lolium perenne, lotus corniculatus, and trifolium pratensein the Rumen
Elliott, Christopher L. ; Edwards, Joan E. ; Wilkinson, Toby J. ; Allison, Gordon G. ; McCaffrey, Kayleigh ; Scott, Mark B. ; Rees-Stevens, Pauline ; Kingston-Smith, Alison H. ; Huws, Sharon A. - \ 2018
Frontiers in Microbiology 9 (2018)SEP. - ISSN 1664-302X - 16 p.
16S rRNA gene - Birds foot trefoil - CowPI - FTIR - Microbiome - Perennial ryegrass - Red clover - Rumen

Understanding rumen plant-microbe interactions is central for development of novel methodologies allowing improvements in ruminant nutrient use efficiency. This study investigated rumen bacterial colonization of fresh plant material and changes in plant chemistry over a period of 24 h period using three different fresh forages: Lolium perenne (perennial ryegrass; PRG), Lotus corniculatus (bird's foot trefoil; BFT) and Trifolium pratense (red clover; RC). We show using 16S rRNA gene ion torrent sequencing that plant epiphytic populations present pre-incubation (0 h) were substantially different to those attached post incubations in the presence of rumen fluid on all forages. Thereafter primary and secondary colonization events were evident as defined by changes in relative abundances of attached bacteria and changes in plant chemistry, as assessed using Fourier transform infrared (FTIR) spectroscopy. For PRG colonization, primary colonization occurred for up to 4 h and secondary colonization from 4 h onward. The changes from primary to secondary colonization occurred significantly later with BFT and RC, with primary colonization being up to 6 h and secondary colonization post 6 h of incubation. Across all 3 forages the main colonizing bacteria present at all time points post-incubation were Prevotella, Pseudobutyrivibrio, Ruminococcus, Olsenella, Butyrivibrio, and Anaeroplasma (14.2, 5.4, 1.9, 2.7, 1.8, and 2.0% on average respectively), with Pseudobutyrivibrio and Anaeroplasma having a higher relative abundance during secondary colonization. Using CowPI, we predict differences between bacterial metabolic function during primary and secondary colonization. Specifically, our results infer an increase in carbohydrate metabolism in the bacteria attached during secondary colonization, irrespective of forage type. The CowPI data coupled with the FTIR plant chemistry data suggest that attached bacterial function is similar irrespective of forage type, with the main changes occurring between primary and secondary colonization. These data suggest that the sward composition of pasture may have major implications for the temporal availability of nutrients for animal.

Contributions of mean and shape of blood pressure distribution to worldwide trends and variations in raised blood pressure : A pooled analysis of 1018 population-based measurement studies with 88.6 million participants
Ezzati, Majid ; Zhou, Bin ; Bentham, James ; Cesare, Mariachiara di; Bixby, Honor ; Danaei, Goodarz ; Hajifathalian, Kaveh ; Taddei, Cristina ; Carrillo-Larco, Rodrigo M. ; Djalalinia, Shirin ; Khatibzadeh, Shahab ; Lugero, Charles ; Peykari, Niloofar ; Zhang, Wan Zhu ; Bennett, James ; Bilano, Ver ; Stevens, Gretchen A. ; Cowan, Melanie J. ; Riley, Leanne M. ; Chen, Zhengming ; Hambleton, Ian R. ; Jackson, Rod T. ; Kengne, Andre Pascal ; Khang, Young Ho ; Laxmaiah, Avula ; Liu, Jing ; Malekzadeh, Reza ; Neuhauser, Hannelore K. ; Sorić, Maroje ; Starc, Gregor ; Sundström, Johan ; Woodward, Mark ; Abarca-Gómez, Leandra ; Abdeen, Ziad A. ; Abu-Rmeileh, Niveen M. ; Acosta-Cazares, Benjamin ; Adams, Robert J. ; Aekplakorn, Wichai ; Afsana, Kaosar ; Aguilar-Salinas, Carlos A. ; Geleijnse, Johanna M. - \ 2018
International Journal of Epidemiology 47 (2018)3. - ISSN 0300-5771 - p. 872 - 883i.
Blood pressure - Global health - Hypertension - Non-communicable disease - Population health

Background: Change in the prevalence of raised blood pressure could be due to both shifts in the entire distribution of blood pressure (representing the combined effects of public health interventions and secular trends) and changes in its high-blood-pressure tail (representing successful clinical interventions to control blood pressure in the hypertensive population). Our aim was to quantify the contributions of these two phenomena to the worldwide trends in the prevalence of raised blood pressure. Methods: We pooled 1018 population-based studies with blood pressure measurements on 88.6 million participants from 1985 to 2016. We first calculated mean systolic blood pressure (SBP), mean diastolic blood pressure (DBP) and prevalence of raised blood pressure by sex and 10-year age group from 20-29 years to 70-79 years in each study, taking into account complex survey design and survey sample weights, where relevant. We used a linear mixed effect model to quantify the association between (probittransformed) prevalence of raised blood pressure and age-group- and sex-specific mean blood pressure. We calculated the contributions of change in mean SBP and DBP, and of change in the prevalence-mean association, to the change in prevalence of raised blood pressure. Results: In 2005-16, at the same level of population mean SBP and DBP, men and women in South Asia and in Central Asia, the Middle East and North Africa would have the highest prevalence of raised blood pressure, and men and women in the highincome Asia Pacific and high-income Western regions would have the lowest. In most region-sex-age groups where the prevalence of raised blood pressure declined, one half or more of the decline was due to the decline in mean blood pressure. Where prevalence of raised blood pressure has increased, the change was entirely driven by increasing mean blood pressure, offset partly by the change in the prevalence-mean association. Conclusions: Change in mean blood pressure is the main driver of the worldwide change in the prevalence of raised blood pressure, but change in the high-blood-pressure tail of the distribution has also contributed to the change in prevalence, especially in older age groups.

Social media hypes about agro-food issues : Activism, scandals and conflicts
Stevens, T.M. ; Aarts, N. ; Termeer, C.J.A.M. ; Dewulf, A. - \ 2018
Food Policy 79 (2018). - ISSN 0306-9192 - p. 23 - 34.
Activism - Conflict - Hype - Livestock - Scandal - Social media

Events and controversies in the agro-food domain frequently generate peak selective activity on social media. These social media hypes are a concern to stakeholders because they can affect public opinion and policy, and are almost impossible to predict. This study develops a model for analysing social media hypes and builds a typology to provide insights into the dynamics of social media hypes in the context of agro-food governance. Five cases of peak social media activity in the Dutch livestock sector are analysed along four dimensions: (1) peak patterns of activity, (2) issues and frames, (3) interaction of actors, and (4) media interplay. An analysis of the dimensions and the interrelations across cases shows that social media hypes revolve around activism, scandals, and conflicts – each with characteristic patterns of activity, framing, interaction and media interplay. Hypes do not just result from important events in the sector, but are generated through the use of organizing concepts with a hashtag to evaluate and establish occasions. Peak activity thus revolves around a few themes and is recurrent and judgmental. Moreover, stakeholders play an active role in instigating and framing social media hypes. Our results show the need to adopt a proactive and interactive approach that transcends the view of social media as a mere communication channel to respond in crisis situations.

Oostvaardersplassen: analyse discussie in sociale media
Mattijssen, T.J.M. ; Breman, B.C. ; Stevens, T.M. - \ 2018
Nature Today
Afgelopen winter leidde de sterfte van wilde dieren in de Oostvaardersplassen tot een heftige maatschappelijke discussie. Nu de media-aandacht wegebt blijft er een aantal prangende vragen liggen voor wildbeheer en natuurbeleid. Hoe kon deze maatschappelijke discussie zo polariseren en resulteren in een aanpassing van het beleid? Sociale media geeft inzicht in het verloop van de discussie.
Survival of Ralstonia solanacearum and Ralstonia pseudosolanacearum in drain water
Stevens, L.H. ; Zouwen, P.S. van der; Tongeren, C.A.M. van; Kastelein, P. ; Wolf, J.M. van der - \ 2018
EPPO Bulletin 48 (2018)1. - ISSN 0250-8052 - p. 97 - 104.
The survival in drain water of two strains of Ralstonia solanacearum and three strains of Ralstonia pseudosolanacearum, including two strains able to cause wilt in roses, was determined. Water draining from drip-irrigated rock wool mats on which roses were grown was supplemented with the pathogen and survival was monitored at 4, 12, 20 and 28°C for up to 112 days. All strains were able to survive for at least 112 days in drain water at 12 and 20°C, but at 4°C maximum survival was 56 days. At 28°C, the survival period was strain dependent, but was at least 56 days. Populations declined gradually in non-sterile drain water to a low level (maximum 100 cfu mL−1 after 112 days). In sterile drain water (autoclaved prior to addition of populations), no or only a limited decline in populations was found at 112 days, dependent on strain and temperature. Drain water that tested negative for Ralstonia in the dilution plating assay was tested for the presence of cells in a viable but non-culturable state (VBNCs). Tomato plants were inoculated, but no symptoms developed, and plants sampled 22 days post-inoculation were negative in a plating assay. Therefore, no indications were found that VBNCs were present.
Na heftige emoties komt reflectie in digitaal debat Oostvaardersplassen
Mattijssen, Thomas ; Breman, Bas ; Stevens, Tim - \ 2018
Fysisch-chemische inductie van systemic acquired resistance (SAR): elicitors & stuurlicht
Stevens, L.H. ; Breeuwsma, S.J. ; Rutgers, B. ; Griekspoor, Y. ; Noordam, Marianne ; Vos, C.H. de; Schipper, A. ; Leiss, K.A. - \ 2018
Programmeringsstudie Meeldauw : Invloed van bestaande en nieuwe interventies op geïnduceerde weerbaarheid tegen biotrofe schimmel
Hofland-Zijlstra, J.D. ; Breeuwsma, S. ; Noordam, M. ; Stevens, L. - \ 2018
Bleiswijk : Wageningen University & Research, Business unit Glastuinbouw (Wageningen Plant Research rapport WPR-749) - 46
Purpose of this TKI project Programming study powdery mildew is to generate new knowledge about existingand new interventions aimed at prevention of mildew development in horticultural crops. This research isconducted by Wageningen University & Research greenhouse horticulture business unit. The project is supportedby LTO Glaskracht Nederland. To test the impact of existing interventions on the natural defenses of a plant testsin climate chamber were carried out with total daylight sum, CO2 and relative humidity. After three weeks theinfluence on the production of pathogen related proteins, which is a measure for induced resistance, was veryminor. However, it is confirmed that relative humidity and the daily light sum influence the mildew developmentdirectly and to a higher extent than the CO2. In addition, changes in nutritional composition of plants may be oneof the first indicators for enhanced disease risk (e.g. sodium).
Is mijn plant/gewas weerbaar?
Stevens, Luc - \ 2017
Beweiden of opstallen geeft financieel nauwelijks verschil
Pol-van Dasselaar, Agnes van den - \ 2017

Tussen bedrijven die beweiden of opstallen zijn beperkte economische verschillen te zien, maar meer typerend is dat de variatie enorm groot is. Dat betekent dat met beide systemen goede economische resultaten zijn te behalen.

Browse preference in bonobos
Hoore, C. D'; Bosch, G. ; Janssens, Geert P.J. ; Stevens, J. ; Pereboom, Z. ; Depauw, S. - \ 2017
Onderzoek richt zich op bodem en mineralen
Groten, Jos - \ 2017
Bio-based chemicals: general discussion
Bitter, Harry ; Clark, James ; Rothenberg, Gadi ; Matharu, Avtar ; Crestini, Claudia ; Argyropoulos, Dimitris ; Cabrera-Rodríguez, Carlos I. ; Dale, Bruce E. ; Stevens, Christian ; Marrocchi, Assunta ; Graca, Ines ; Luo, Hui ; Pant, Deepak ; Wilson, Karen ; Zijlstra, Douwe Sjirk ; Gschwend, Florence ; Mu, Xindong ; Zhou, Long ; Hu, Changwei ; Lapkin, Alexei ; Mascal, Mark ; Budarin, Vitaliy ; Hunt, Andrew ; Waldron, Keith ; Zhang, Fang ; Zhenova, Anna ; Samec, Joseph ; Huber, George ; Coma, Marta ; Huang, Xiaoming ; Bomtempo, José-Vitor - \ 2017
Faraday Discussions 202 (2017). - ISSN 1359-6640 - p. 227 - 245.
Global Goal Setting for Improving National Governance and Policy
Biermann, F. ; Stevens, C. ; Bernstein, S. ; Gupta, A. ; Kanie, N. ; Nilsson, M. ; Scobie, M. - \ 2017
In: Governing through Goals: Sustainable Development Goals as Governance Innovation / Kanie, Norichika, Biermann, Frank, Cambridge : MIT Press (Earth System Governance: A Core Research Project of the International Human Dimensions Programme on Global Environmental Change ) - ISBN 9780262035620 - p. 75 - 98.
Can better governance, in itself, be a subject for global goal setting? This question stands at the center of this chapter, which focuses on the inclusion of “governance goals” in global goal-setting mechanisms, especially the Sustainable Development Goals agreed upon by the UN General Assembly in September 2015 as part of its 2030 Agenda for Sustainable Development (UNGA 2015). While our discussion is inspired by the negotiations around governance goals and targets within the context of Sustainable Development Goals, we seek to build a broader analytic approach that goes beyond the integration of governance in this specific context.
Chemical Eradication of the Ring Rot Bacterium Clavibacter michiganensis subsp. sepedonicus on Potato Storage Crates
Stevens, L.H. ; Lamers, J.G. ; Zouwen, P.S. van der; Mendes, O. ; Berg, W. van den; Tjou-Tam-Sin, N.N.A. ; Jilesen, C.J.T.J. ; Spoorenberg, P.M. ; Wolf, J.M. van der - \ 2017
Potato Research 60 (2017)2. - ISSN 0014-3065 - p. 145 - 158.
Bacterium - Clavibacter michiganensis subsp. sepedonicus - Disinfection - Potato - Quarantine organism - Sodium-p-toluenesulfochloramide

Four commercially available disinfection products were tested for their efficacy against Clavibacter michiganensis subsp. sepedonicus (Cms), causative agent of bacterial ring rot, on wooden potato storage crates. Each of these products represented a different class of biocide, i.e. organic acids (benzoic acid), peroxygenous compounds (potassium peroxysulfate), quaternary ammonium compounds (didecyldimethylammoniumchloride) and hypochlorite-generating compounds (sodium-p-toluenesulfochloramide). The target objects consisted of small wooden panels that were smeared with potato tuber pulp homogenized with a high inoculum of Cms. By dipping the inoculated panels into the product solutions and subsequent determination of the densities of colony-forming units, the relative efficacy of the products was established. The two products that exhibited the highest relative efficacy were studied for their disinfection performance when applied as cleaning agent in a conventional automated crate washer. The results showed that jet cleaning in a crate washer for 2 min using the authorised dose of the product containing sodium-p-toluenesulfochloramide is an effective method for disinfecting Cms-contaminated wooden potato crates.

Expert Meeting Green Challenge Plantweerbaarheid en Sensoren
Hofland-Zijlstra, Jantineke - \ 2016
mmv Caroline van der Salm, Marjolein Kruidhof, Ellen Beerling, Tycho Vermeulen, Jochen Hemming, Carolien Zijlstra, Luc Stevens, Ric de Vos
Workshop Artemis Biostimulantia
Overbeek, Leo van - \ 2016
61. Achtergrond Werkingsmechanismen Biostimulanten. In Dutch. Leo van Overbeek en Luc Stevens.
Integrative analysis of results from the four countries
Stevens, P. ; Ouessar, Mohamed ; Sawadogo, M. ; Woldearegay, Kifle ; Wamunyima, Silenga ; Hessel, R. ; Grum, Berhane ; Fleskens, L. ; Kirkby, M. ; Irvine, Brian - \ 2016
Wahara project (Wahara report series 33) - 26 p.
WAHARA final publishable summary
Hessel, R. ; Ouessar, Mohamed ; Sawadogo, H. ; Woldearegay, Kifle ; Fleskens, L. ; Stevens, P. ; Steenbergen, F. van - \ 2016
Wahara project (Wahara report series 36) - 39 p.
Suite of dissemination products
Abhishek, Abraham ; Hessel, R. ; Fleskens, L. ; Steenbergen, F. van; Ouessar, Mohamed ; Sawadogo, H. ; Woldearegay, Kifle ; Wamunyima, Silenga ; Ritsema, C.J. ; Stevens, P. - \ 2016
Wahara project (Wahara report series 40) - 40 p.
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