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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No more nutmegging with nutmeg : Analytical fingerprints for distinction of quality from low-grade nutmeg products
Ruth, Saskia M. van; Silvis, Isabelle C.J. ; Alewijn, Martin ; Liu, Ningjing ; Jansen, Marc ; Luning, Pieternel A. - \ 2019
Food Control 98 (2019). - ISSN 0956-7135 - p. 439 - 448.
Adulteration - Aroma - FI-ESI-MS - Fraud - PTR-MS - Spices

Quality nutmeg is characterized by a delicate aroma. Next to quality nutmeg, other – lower - grades exist on the market, such as extracted material (spent) or ground shell or dried fruit pulp. Strong fluctuations in the price of nutmeg lead to rapid changes in market dynamics and marketing opportunities, and unfortunately results in illegal commingle of ground quality nutmeg with low-grade material. In this study, we examined fingerprints of volatile and non-volatile compounds of high quality and low-grade nutmeg material by Proton Transfer Reaction Mass Spectrometry and Flow Infusion ElectroSpray Ionization Mass Spectrometry, respectively. They were compared with data from classical measurements such as total ash, acid insoluble ash, moisture and volatile oil contents. Differences in composition were examined by univariate and multivariate statistical methods. Furthermore, one-class classification models for quality nutmeg were estimated using different algorithms and their performances were examined with quality nutmeg and low-grade material, as well as mixtures thereof. Distinct differences between quality nutmeg and low-grade nutmeg samples were observed for both their volatile and non-volatile fingerprints. Intensities of volatiles and non-volatiles are highly correlated, but this phenomenon diminishes gradually and even reverses with rising molecular mass of the non-volatiles. Results showed that both techniques allowed a nearly 100% correct prediction of quality nutmeg and low-grade nutmeg samples. Therefore, both approaches are promising and with further database extension, they may become a valuable addition to the analytical authentication toolbox in addition to the classical methods and help to detect future ‘nutmeggers’.

Long-term effects of wild ungulates on the structure, composition and succession of temperate forests
Ramirez Chiriboga, J.I. ; Jansen, P.A. ; Ouden, J. den; Goudzwaard, L. ; Poorter, L. - \ 2019
Forest Ecology and Management 432 (2019). - ISSN 0378-1127 - p. 478 - 488.
Ungulates in temperate regions are increasing in range and abundance, leading to concerns that browsing and trampling reach levels that hamper tree recruitment and forest regeneration. However, studies that actually quantify the long-term effects of ungulates on forest succession are scarce. Here, we use a chronosequence of ungulate exclosures (fenced) and control (unfenced) plots to assess the long-term effects of ungulates on forest structure, diversity and litter depth in forests on poor sandy soils at the Veluwe, the Netherlands, which have moderate ungulate densities ( = 13.6 ungulates km−2). We surveyed the vegetation in 27 paired fenced and unfenced plots that ranged from 1 to 33 years old, and measured seven variables to characterize forest structure (stem density, canopy cover and understory vegetation cover), composition (Shannon diversity, species richness and conifer proportion) and leaf litter depth. We found on average that fencing compared to unfencing reduced understory vegetation cover (fenced = 64.3 ± 20.2%, unfenced = 80.3 ± 19.4%), increased canopy cover (fenced = 47.4 ± 30.1%, unfenced = 29.3 ± 21.1%), tree species richness (fenced = 4.5 ± 1.3 spp., unfenced = 2.7 ± 1.2 spp.), tree Shannon diversity (fenced = 1.1 ± 0.3 index, unfenced = 0.7 ± 0.3 index) and litter layer depth (fenced = 4.4 ± 1.4 cm, unfenced = 2.4 ± 1.1 cm). While fenced plots developed woody vegetation with palatable broadleaved species such as Betula pendula, Betula pubescens, Prunus serotina, and Quercus robur, unfenced plots were not associated with any particular tree species. Our results show that current ungulate densities in this system have pronounced long-term effects on forest structure, composition and litter depth, implying that ungulates can slow down natural succession of temperate forest, from light demanding to shade tolerant species, by keeping the system in an arrested state consisting of light demanding species.
Similarities and differences of the volatile profiles of six spices explored by Proton Transfer Reaction Mass Spectrometry
Silvis, I.C.J. ; Luning, P.A. ; Klose, N. ; Jansen, M. ; Ruth, S.M. van - \ 2019
Food Chemistry 271 (2019). - ISSN 0308-8146 - p. 318 - 327.
2-Butanone (PubChem CID: 6569) - Acetic acid (PubChem CID: 176) - Aroma - Cinnamaldehyde (PubChem CID: 637511) - Estragole (PubChem CID: 8815) - Fingerprints - Methanol (PubChem CID: 887) - Non-destructive - P-cymene (PubChem CID: 7463) - PTR-TOFMS - Safranal (PubChem CID: 61041) - Volatile compounds

Aroma properties of spices are related to the volatile organic compounds (VOCs) present, which can provide distinct analytical signatures. The aim of the study was to examine similarity and diversity of VOC profiles of six common market spices (black/white pepper, chili paprika, cinnamon, nutmeg and saffron). The key volatiles were identified by PTR-TOFMS. Twelve samples per spice were subjected to PTR-Quadrupole MS (PTR-QMS) and Principal Component Analysis to compare the groups and examine diversity. With PTR-TOFMS, 101 volatile compounds were identified as total sum across all samples by mass and comparing them with literature data. Some spices comprised key character aroma compounds, e.g. cinnamaldehyde in cinnamon. For others, VOC groups, such as terpenes, acids and aldehydes topped the list. The PTR-QMS in combination with variables selection resulted in distinct PCA patterns for each spice. Variation within the spice groups was observed, but varied with the kind of spice. The results are valuable for future authentication studies.

Zeewier tussen de windmolens
Jansen, Henrice - \ 2018
Lijnen met zeewier tussen windmolens voor Zeeuwse kust?
Jansen, Henrice - \ 2018
The Politics of Counter-Expertise on Aerial Spraying : Social Movements Denouncing Pesticide Risk Governance in the Philippines
Nikol, Lisette J. ; Jansen, Kees - \ 2018
Journal of Contemporary Asia (2018). - ISSN 0047-2336 - 26 p.
aerial spraying - counter-expertise - Philippines - risk governance - weak state

In various places in the world, aerial spraying of pesticides has met with resistance from local communities potentially endangered by toxic pesticide drift. Social movements, and the counter-expertise that they mobilise, often trigger changes in state regulations of the practice. This article describes such struggles over risk regulation in the Philippines, where aerial spraying is common in large monoculture banana plantations. It has provoked local activism contesting the socio-economic power of landed and business elites and has challenged the government’s approach to managing pesticide risks. This article develops the argument that different types of counter-expertise must be recognised. The case shows that it can be difficult for movements to articulate these different types of counter-expertise. Furthermore, the weak state characteristics of the Philippine state has shaped the ambiguous responses of risk governance to multiple actors’ divergent knowledge claims. The result is a legal impasse in which civil society has successfully pushed the issue of aerial spraying onto the national political arena, but the state has as yet been unable to develop a comprehensive pesticide risk regulation independent of powerful business interests.

Bepaling van de larvendynamiek en mossel broedval bij de Noordzeeboerderij ten behoeve van optimalisatie oogstmoment zeewier
Tonk, Linda ; Dalen, Pim van; Jansen, Henrice - \ 2018
Yerseke : Wageningen Marine Research (Wageningen Marine Research rapport C097/18) - 14
FEM growth and yield data monocultures - Norway spruce (revised version)
Jansen, J.J. ; Oosterbaan, A. ; Goudzwaard, L. ; Oldenburger, J.F. ; Boosten, M. ; Mohren, G.M.J. ; Ouden, J. den - \ 2018
growth and yield - even-aged monoculture forest - tree diameter - tree height - crown class - coordinates stem positions - age - top height - dominant height - monitoring - Norway spruce - Picea abies - dominant diameter
In this revised edition, 28 test plots were added from the former Stichting Industriehout. This database is part of the FEM growth and yield database, a collection of growth and yield data from even-aged monocultures.
FEM growth and yield data Monocultures - Black alder
Boosten, M. ; Jansen, J.J. ; Oosterbaan, A. ; Copini, P. ; Oldenburger, J.F. ; Mohren, G.M.J. ; Ouden, J. den - \ 2018
growth and yield - even-aged monoculture forest - tree diameter - tree height - crown class - coordinates stem positions - age - top height - dominant height - dominant diameter - monitoring - Black Alder - Alnus glutinosa
This database is part of the FEM growth and yield database, a collection of growth and yield data from even-aged monocultures. In the first edition of the database, the data of Black Elder were part of the dataset “FEM growth and yield data Monocultures – Other species”.
Vertrouwen als indicator voor veerkracht
Jansen, I. ; Vries, J.R. de - \ 2018
Resilience Magazine (2018).
FEM growth and yield data monocultures - Other species (revised version)
Goudzwaard, L. ; Jansen, J.J. ; Oosterbaan, A. ; Oldenburger, J.F. ; Boosten, M. ; Mohren, G.M.J. ; Ouden, J. den - \ 2018
growth and yield - even-aged monoculture forest - tree diameter - tree height - crown class - coordinates stem positions - age - top height - dominant height - Black locust - Robinia pseudocacia - European hornbeam - Carpinus betulus - European larch - Larix decidua - Elm - Ulmus species - Eastern white pine - Pinus strobus - Lodgepole pine - Pinus contorta - Maritime pine - Pinus maritima - Port Orford cedar - Chamaecyparis lawsoniana - Sweet chestnut - Castanea sativa - Serbian spruce - Picea omorika - Silver fir - Abies alba - Western hemlock - Tsuga hetrophylla - Western red ceder - Thuja plicata - Wild cherry - Prunus avium
In this version 13 new plots of White elder and 13 new plots of Sitka spruce were added, both from the collection of the former Stichting Industriehout. This database is part of the FEM growth and yield database, a collection of growth and yield data from even-aged monocultures.
FEM growth and yield data Monocultures - Poplar (2nd revised version)
Mohren, G.M.J. ; Goudzwaard, L. ; Jansen, J.J. ; Schmidt, P. ; Oosterbaan, A. ; Oldenburger, J.F. ; Ouden, J. den; Copini, P. - \ 2018
growth and yield - even-aged monoculture forest - tree diameter - tree height - crown class - coordinates stem positions - age - mean height - spacing - without thinning - systematic thinning - monitoring - Poplar - Aspen - Populus species - Populus x canadensis - Populus x interamericana - Populus alba - Populus tremula
In this new version, the data of 227 test plots of the former Stichting Industriehout were added. Also the location information of the test plots of the Dorschkamp/IBN were added. This database is part of the FEM growth and yield database, a collection of growth and yield data from even-aged monocultures.
The Philippine controversy over aerial spraying of pesticides: a timeline of selected developments,1997-2016
Nikol, Lisette J. ; Jansen, Kees - \ 2018
Wageningen : Wageningen University, Rural Sociology Group - 31
The general ban on aerial spraying of pesticides of the European Union: the policy-making process between 1993-2009
Zwetsloot, Hannah M. ; Nikol, Lisette ; Jansen, Kees - \ 2018
Wageningen : Wageningen University, Rural Sociology Group - 34
Putative regulatory candidate genes for QTL linked to fruit traits in oil palm (Elaeis guineensis Jacq.)
Ting, Ngoot Chin ; Mayes, Sean ; Massawe, Festo ; Sambanthamurthi, Ravigadevi ; Jansen, Johannes ; Syed Alwee, Sharifah Shahrul Rabiah ; Seng, Tzer Ying ; Ithnin, Maizura ; Singh, Rajinder - \ 2018
Euphytica 214 (2018)11. - ISSN 0014-2336
Deli dura - Marker-assisted selection - Pseudo-chromosome - Yangambi pisifera - Yield components

Palm oil is among the most important vegetable oils, contributing to a quarter of the world’s oils and fats market. The oil palm (Elaeis guineensis Jacq.) fruitlets, which are the source of palm oil, vary from 8 to 20 g in weight. Palm oil content in the fruitlets is approximately 45–50% by weight and an increase in the percentage of mesocarp-to-fruit is likely to have a positive effect on oil yield. In this study, we report a quantitative trait loci (QTL) associated with two yield related components, namely fruit and mesocarp content in a commercial breeding population (Deli dura × Yangambi pisifera). The QTL confidence interval of about 12 cM (~ 6.7 Mbp) was fine-mapped with 31 markers (17 SNPs and 14 SSRs) consisting of 20 nuclear markers derived from the maternal parent, six paternal and five co-segregating markers. Interestingly, inheritance of the paternal alleles leads to a larger difference in both fruit and mesocarp weight, when comparing genotypes in the progeny palms. Candidate genes and transcription factors were mined from the QTL region by positioning markers on the oil palm EG5 genome build. Putative genes and transcription factors involved in various biological processes including flower organ development, flowering, photosynthesis, microtubule formation, nitrogen and lipid metabolism were identified within this QTL interval on pseudo-chromosome 3. This genome-based approach allowed us to identify a number of potential candidate gene markers associated with oil palm fruit and mesocarp weight which can be further evaluated for potential use in marker-assisted breeding.

Sustainable banana cultivation: from standards to multiple solutions
Vellema, Sietze ; Jansen, Kees - \ 2018
In: Achieving sustainable cultivation of bananas / Kema, Gert H.J., Drenth, André, Cambridge : Burleigh Dodds Science Publishing Limited - ISBN 9781786761569 - p. 323 - 336.
There is no single recipe for sustainable banana cultivation. Pest and disease management has been central to sustainability efforts, particularly in the export industry. The global and local spread of pathogens make the capacity to manage such threats a shared concern for leading banana exporters and smallholders. This chapter addresses the gap between implementation of global sustainability standards in the export industry based on a single banana variety, Cavendish, and the overwhelming diversity of varieties, uses and production environments related to local food security and rural livelihoods. This gap between ecologically and socially diverse production systems and management strategies relying on standardisation of a package of practices complicates coordinated action working towards multiple solutions. The chapter includes a case study of a major banana-producing region in the Philippines, representing variety in banana production systems, which shows the importance of working towards a territorial approach that has the capacity to accommodate and connect multiple solutions for making banana cultivation sustainable.
Viable coxiella burnetii induces differential cytokine responses in chronic Q fever patients compared to Heat-Killed Coxiella burnetii
Jansen, Anne F.M. ; Dinkla, Annemieke ; Roest, Hendrik Jan ; Bleeker-Rovers, Chantal P. ; Schoffelen, Teske ; Joosten, Leo A.B. ; Wever, Peter C. ; Deuren, Marcel van; Koets, Ad P. - \ 2018
Infection and Immunity 86 (2018)10. - ISSN 0019-9567
Chronic Q fever - Coxiella burnetii - Cytokines - Immune response

Cytokine responses of chronic Q fever patients to the intracellular bacterium Coxiella burnetii have mostly been studied using ex vivo stimulation of immune cells with heat-killed C. burnetii due to the extensive measures needed to work with viable biosafety level 3 agents. Whether research with heat-killed C. burnetii can be translated to immune responses to viable C. burnetii is imperative for the interpretation of previous and future studies with heat-killed C. burnetii. Peripheral blood mononuclear cells (PBMCs) of chronic Q fever patients (n = 10) and healthy controls (n = 10) were stimulated with heat-killed or viable C. burnetii of two strains, Nine Mile and the Dutch outbreak strain 3262, for 24 h, 48 h, and 7 days in the absence or presence of serum containing anti-C. burnetii antibodies. When stimulated with viable C. burnetii, PBMCs of chronic Q fever patients and controls produced fewer proinflammatory cytokines (interleukin-6 [IL-6], tumor necrosis factor alpha, and IL-1β) after 24 h than after stimulation with heat-killed C. burnetii. In the presence of Q fever seronegative serum, IL-10 production was higher after stimulation with viable rather than heat-killed C. burnetii; however, when incubating with anti-C. burnetii antibody serum, the effect on IL-10 production was reduced. Levels of adaptive, merely T-cell-derived cytokine (gamma interferon, IL-17, and IL-22) and CXCL9 production were not different between heat-killed and viable C. burnetii stimulatory conditions. Results from previous and future research with heat-killed C. burnetii should be interpreted with caution for innate cytokines, but heat-killed C. burnetii-induced adaptive cytokine production is representative of stimulation with viable bacteria.

Assessing the Sustainability Performance of Coffee Farms in Vietnam: A Social Profit Inefficiency Approach
Gaitán Cremaschi, D. ; Evert, F.K. van; Jansen, Don ; Gielen-Meuwissen, M.P.M. ; Oude Lansink, A.G.J.M. - \ 2018
Sustainability 10 (2018)11. - ISSN 2071-1050
If we aim to increase the sustainability of farming, we must be able to measure the sustainability of individual farms and relate this sustainability to the characteristics of the farm and its management. We hypothesized that (i) sustainability can be expressed using social profit, and (ii) socio-economic characteristics and management practices of farms explain differences in sustainability. The objective of our work was to provide empirical evidence for these hypotheses. Data was collected data over two years from 361 coffee farms in Vietnam to calculate social profit. We found that the average social profit of farms was 2300 USD. The main source of social profit inefficiency is the sub-optimal allocation of resources and levels of production. Statistical association between the set of socio-economic characteristics and management practices and social profit inefficiency shows that social profit inefficiency is increased (sustainability is decreased) by larger distances from the coffee farm to the closest town/city center and to the closest coffee factory/traders and by a high frequency of spraying. On the other hand, sustainability is increased when coffee producers belong to the ethnic group JoRai, when using more hired labor and frequency, and when there are a larger number of fertilizing and pruning activities. We conclude that social profit inefficiency can be used to summarize sustainability.
Zeewier, niet alleen maar lekker bij vis: WMR Regiocentrum Yerseke
Tonk, Linda ; Jansen, H.M. - \ 2018
Visserijnieuws 38 (2018)35. - ISSN 1380-5061 - p. 4 - 4.
Comparative institutional analysis for public health: governing voluntary collaborative agreements for public health in England and the Netherlands
Bekker, Marleen ; Mays, N. ; Helderman, J.K. ; Petticrew, M. ; Jansen, M.W.J. ; Knai, C. ; Ruwaard, D. - \ 2018
European Journal of Public Health 28 (2018)suppl. 3. - ISSN 1101-1262 - p. 19 - 25.
Democratic institutions and state-society relations shape governance arrangements and expectations between public and private stakeholders about public health impact. We illustrate this with a comparison between the English Public Health Responsibility Deal (RD) and the Dutch ‘All About Health…’ (AaH) programme. As manifestations of a Whole-of-Society approach, in which governments, civil society and business take responsibility for the co-production of economic utility and good health, these programmes are two recent collaborative platforms based on voluntary agreements to improve public health. Using a ‘most similar cases’ design, we conducted a comparative secondary analysis of data from the evaluations of the two programmes. The underlying rationale of both programmes was that voluntary agreements would be better suited than regulation to encourage business and civil society to take more responsibility for improving health. Differences between the two included: expectations of an enforcing versus facilitative role for government; hierarchical versus horizontal coordination; big business versus civil society participants; top-down versus bottom-up formulation of voluntary pledges and progress monitoring for accountability versus for learning and adaptation. Despite the attempt in both programmes to base voluntary commitments on trust, the English ‘shadow of hierarchy’ and adversarial state-society relationships conditioned non-governmental parties to see the pledges as controlling, quasi-contractual agreements that were only partially lived up to. The Dutch consensual political tradition enabled a civil society-based understanding and gradual acceptance of the pledges as the internalization by partner organizations of public health values within their operations. We conclude that there are institutional limitations to the implementation of generic trust-building and learning-based models of change ‘Whole-of-Society’ approaches.
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