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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    Insects for food and feed
    Beckers, Erwin ; Oonincx, Dennis - \ 2019
    Tour 3: The Protein Transition
    Krekels om te overleven
    Beckers, Erwin - \ 2019

    Het eten van insecten kan mogelijk een oplossing zijn voor het groeiende voedselprobleem van de wereldbevolking.

    Krekels door de pap
    Beckers, E.P.J. - \ 2019
    Crickets in the porridge
    Beckers, E.P.J. - \ 2019
    Brucella pinnipedialis in grey seals (Halichoerus grypus) and harbor seals (Phoca vitulina) in the Netherlands
    Kroese, Michiel V. ; Beckers, Lisa ; Bisselink, Yvette J.W.M. ; Brasseur, Sophie ; Tulden, Peter W. van; Koene, Miriam G.J. ; Roest, Hendrik I.J. ; Ruuls, Robin C. ; Backer, Jantien A. ; Ijzer, Jooske ; Giessen, Joke W.B. van der; Willemsen, Peter T.J. - \ 2018
    Journal of Wildlife Diseases 54 (2018)3. - ISSN 0090-3558 - p. 439 - 449.
    Brucella pinnipedialis - Halichoerus grypus - MALDI-TOF MS - Marine mammals - MLST - MLVA-16 - Phoca vitulina - The Netherlands

    Brucellosis is a zoonotic disease with terrestrial or marine wildlife animals as potential reservoirs for the disease in livestock and human populations. The primary aim of this study was to assess the presence of Brucella pinnipedialis in marine mammals living along the Dutch coast and to observe a possible correlation between the presence of B. pinnipedialis and accompanying pathology found in infected animals. The overall prevalence of Brucella spp. antibodies in sera from healthy wild grey seals (Halichoerus grypus; n=11) and harbor seals (Phoca vitulina; n=40), collected between 2007 and 2013 ranged from 25% to 43%. Additionally, tissue samples of harbor seals collected along the Dutch shores between 2009 and 2012, were tested for the presence of Brucella spp. In total, 77% (30/ 39) seals were found to be positive for Brucella by IS711 real-time PCR in one or more tissue samples, including pulmonary nematodes. Viable Brucella was cultured from 40% (12/30) real-time PCR-positive seals, and was isolated from liver, lung, pulmonary lymph node, pulmonary nematode, or spleen, but not from any PCR-negative seals. Tissue samples from lung and pulmonary lymph nodes were the main source of viable Brucella bacteria. All isolates were typed as B. pinnipedialis by multiple-locus variable number of tandem repeats analysis-16 clustering and matrix-assisted laser desorption ionization-time of flight mass spectrometry, and of sequence type ST25 by multilocus sequence typing analysis. No correlation was observed between Brucella infection and pathology. This report displays the isolation and identification of B. pinnipedialis in marine mammals in the Dutch part of the Atlantic Ocean.

    Modern impacts on an ancient landscape, the piedmont plain in southwest Turkmenistan
    Berking, J. ; Beckers, B. ; Reimann, T. ; Pollock, S. ; Bernbeck, R. - \ 2017
    Wiley Interdisciplinary Reviews: Water 4 (2017)2. - ISSN 2049-1948 - 20 p.
    The piedmont plain in southwestern Turkmenistan has experienced a millennia-long settlement history despite prevailing arid climates. One of the prerequisites for the various agricultural efforts was irrigation. Most of the water used for irrigation measures came from the adjacent Kopet Dag mountain chain. This situation changed with the introduction of the Karakum canal in the middle of the 20th century. The present study evaluates the rich irrigation history of the piedmont plain by investigating two small catchments that drain the eastern ranges of the Kopet Dag. Within their catchments, geomorphological and hydrological analyses were conducted. We present several Optically Stimulated Luminescence and 14-C dating results that add to the understanding of the landscape history from the Pleistocene until modern ages. Moreover, modern climatological and hydrological data were analyzed that show a remarkable drop in runoff from the Kopet Dag since the 1960s.
    Residual uncertainty estimation using instance-based learning with applications to hydrologic forecasting
    Wani, Omar ; Beckers, Joost V.L. ; Weerts, Albrecht H. ; Solomatine, Dimitri P. - \ 2017
    Hydrology and Earth System Sciences 21 (2017)8. - ISSN 1027-5606 - p. 4021 - 4036.

    A non-parametric method is applied to quantify residual uncertainty in hydrologic streamflow forecasting. This method acts as a post-processor on deterministic model forecasts and generates a residual uncertainty distribution. Based on instance-based learning, it uses a k nearest-neighbour search for similar historical hydrometeorological conditions to determine uncertainty intervals from a set of historical errors, i.e. discrepancies between past forecast and observation. The performance of this method is assessed using test cases of hydrologic forecasting in two UK rivers: the Severn and Brue. Forecasts in retrospect were made and their uncertainties were estimated using kNN resampling and two alternative uncertainty estimators: quantile regression (QR) and uncertainty estimation based on local errors and clustering (UNEEC). Results show that kNN uncertainty estimation produces accurate and narrow uncertainty intervals with good probability coverage. Analysis also shows that the performance of this technique depends on the choice of search space. Nevertheless, the accuracy and reliability of uncertainty intervals generated using kNN resampling are at least comparable to those produced by QR and UNEEC. It is concluded that kNN uncertainty estimation is an interesting alternative to other post-processors, like QR and UNEEC, for estimating forecast uncertainty. Apart from its concept being simple and well understood, an advantage of this method is that it is relatively easy to implement.

    ENSO-conditioned weather resampling method for seasonal ensemble streamflow prediction
    Beckers, Joost V.L. ; Weerts, Albrecht H. ; Tijdeman, Erik ; Welles, Edwin - \ 2016
    Hydrology and Earth System Sciences 20 (2016)8. - ISSN 1027-5606 - p. 3277 - 3287.

    Oceanic-atmospheric climate modes, such as El Niño-Southern Oscillation (ENSO), are known to affect the local streamflow regime in many rivers around the world. A new method is proposed to incorporate climate mode information into the well-known ensemble streamflow prediction (ESP) method for seasonal forecasting. The ESP is conditioned on an ENSO index in two steps. First, a number of original historical ESP traces are selected based on similarity between the index value in the historical year and the index value at the time of forecast. In the second step, additional ensemble traces are generated by a stochastic ENSO-conditioned weather resampler. These resampled traces compensate for the reduction of ensemble size in the first step and prevent degradation of skill at forecasting stations that are less affected by ENSO. The skill of the ENSO-conditioned ESP is evaluated over 50 years of seasonal hindcasts of streamflows at three test stations in the Columbia River basin in the US Pacific Northwest. An improvement in forecast skill of 5 to 10 % is found for two test stations. The streamflows at the third station are less affected by ENSO and no change in forecast skill is found here.

    Innovative approaches to improve sustainability of physical distribution in the Dutch agro-food industry
    Pieters, R. ; Bogers, E. ; Glöckner, H.H. ; Omta, S.W.F. ; Weijers, S. - \ 2014
    Since the publication of the Brundlandt report (1987), organizations have put sustainability at the top of their agendas (Szekely & Knirsch, 2005). Nowadays sustainability is incorporated into the strategy of almost all organizations (De Ron, 2001; McDonough & Braungart, 2002). The agro-food sector has a long history of sustainable awareness on the use of land, water, pesticides, fertilizers and energy (Leaver, 2011; Leach et al., 2012). Most literature on transportation of agro business products concentrates on food security (Henson & Caswell, 1999; Maloni & Brown, 2006; Godfray et al., 2010). Few studies have addressed the role of sustainability when transporting agro-food product. But how do logistics service providers, shippers and private carriers in the agro-food industry translate strategic policies into tangible innovative sustainable physical distribution? This paper focuses on sustainability in physical distribution of agro-food products and the role logistics service providers, shippers and private carriers play in this process. Do they approach sustainability as an integrated and repeatable phenomenon or is it seen as a singular action concerning individual situations? And what are the new, innovative ideas concerning making physical distribution more sustainable which are generated by this process? The purpose of this study is to help increase our understanding on how the relationship between shipper, private carrier and logistics service provider in the food industry relates to improving sustainability. If properly understood, it will aid us in making physical distribution in the food industry more sustainable. We want to answer the following questions: 1. What innovative actions have Dutch logistics service providers, shippers and private carriers in the agro-food industry undertaken to make physical distribution more sustainable? 2. What can be learned from the experience of best cases on making physical distribution in the Dutch agro-food industry more sustainable? The conceptual framework for our research is based on the same heuristic model used in the 1994 NEA/Cranfield study. Weijers, Kuipers and Becker (2002) adapted this framework for research in industry driven innovations for logistics service providers. We have adapted their model to trace the elements in sustainable physical distribution trends. Figure 1 Conceptual Framework For this we have interviewed seven logistics service providers, two private carriers and four producers of agro-food items. We have asked them how they approach and improve sustainability within physical distribution. Which strategies they have developed for sustainability. What kind of actions do they undertake on the field of sustainability and if so, what kind of innovative ways they have introduced to make physical distribution of food items more sustainable. We found that most of these innovations were related to bilateral relationships between one shipper with one logistics service provider. Learning from experiences obtained by colleagues and competitors was not an issue. A pity, as we believe that sharing of experience will help the sector to improve sustainability within the physical distribution of food items. We will give examples where an innovation in shipping agro-food products created not only a positive effect on the sustainability in the physical distribution, but also created an unforeseen positive impact on other aspects in the value chain. Finally we will show the results of an in-depth research (Yin, 2009) into an interesting project in the Netherlands where various shippers of food items share transportation capacity with each other even if they are competitors for the same agro-food market. This sharing has increased the loading capacity and reduced cost drastically. References De Ron, A. 2001 Duurzaam ondernemen: een inleiding. Deventer, The Netherlands: Kluwer. Godfray, H. C. J., Beddington, J. R., Crute, I. R., Haddad, L., Lawrence, D., Muir, J. F., ... & Toulmin, C. (2010). Food security: the challenge of feeding 9 billion people. Science, 327(5967), 812-818. Henson, S., & Caswell, J. (1999). Food safety regulation: an overview of contemporary issues. Food policy, 24(6), 589-603. Leach, M., J. Rockström, P. Raskin, I. Scoones, A. C. Stirling, A. Smith, J. Thompson, E. Millstone, A. Ely, E. Arond, C. Folke, & P. Olsson. (2012) Transforming innovation for sustainability. Ecology and Society 17(2): 11. http://dx.doi.org/10.5751/ES-04933-1711 Leaver, J. D. (2011). Global food supply: a challenge for sustainable agriculture. Nutrition Bulletin, 36(4), 416-421. doi:10.1111/j.1467-3010.2011.01925.x Maloni, M. J., & M. E Brown. 2006. Corporate Social Responsibility in the Supply Chain: An Application in the Food Industry. Journal of Business Ethics 68 (1): 35-52. McDonough, W., & M. Braungart. 2002. Cradle to Cradle: Remaking the Way we Make Things. New York, N.Y.: North Point Press. NEA/Cranfield. 1994. Future Logistics Structures, the development of integrated supply chain management across 6 industry sectors. Tilburg, The Netherlands: NEA/Cranfield. Szekely, F., & M. Knirsch. 2005. Responsible Leadership and Corporate Social Responsibility: Metrics for Sustainable Performance. European Management Journal 23 (6): 628-647. Tobler, C. , V.H. Visschers, M. Siegrist, (2011), Eating green. Consumers’ willingness to adopt ecological food consumption behaviors. Appetite, 57 pp. 674–682 Vollenbroek, F. A. 2002. Sustainable development and the challenge of innovation. Journal of Cleaner Production 10 (3): 215–223. Weijers, S., B. Kuipers, & J. Beckers. 2002. Industry driven innovation for logistics service providers. Actes des Quatrièmes Rencontres Internacionales de la Recherche en Logistique http://www.airl-logistique.org/fr/files/?view=225 (accessed February 20 ,2012). World Commission on Environment and Development. 1987. Our common future : the report of the World Commission on Environment and Development. New York, N.Y. : Oxford University Press. Yin R. K. 2009. Case Study Research: Design and Methods. 4th Edition. Thousands Oals, CA: SAGE
    Low-water activity foods: increased concern as vehicles of foodborne pathogens
    Beuchat, L.R. ; Komitopoulou, E. ; Beckers, H. ; Betts, R.P. ; Bourdichon, F. ; Fanning, S. ; Joosten, H.M.L.J. ; Kuile, B.H. ter - \ 2013
    Journal of Food Protection 76 (2013)1. - ISSN 0362-028X - p. 150 - 172.
    escherichia-coli o157-h7 - powdered infant formula - salmonella-agona infection - eat savoury snack - enterobacter-sakazakii - cronobacter spp. - peanut butter - international outbreak - heat-resistance - milk powder
    Foods and food ingredients with low water activity (aw) have been implicated with increased frequency in recent years as vehicles for pathogens that have caused outbreaks of illnesses. Some of these foodborne pathogens can survive for several months, even years, in low-aw foods and in dry food processing and preparation environments. Foodborne pathogens in low-aw foods often exhibit an increased tolerance to heat and other treatments that are lethal to cells in high-aw environments. It is virtually impossible to eliminate these pathogens in many dry foods or dry food ingredients without impairing organoleptic quality. Control measures should therefore focus on preventing contamination, which is often a much greater challenge than designing efficient control measures for high-aw foods. The most efficient approaches to prevent contamination are based on hygienic design, zoning, and implementation of efficient cleaning and sanitation procedures in the food processing environment. Methodologies to improve the sensitivity and speed of assays to resuscitate desiccated cells of foodborne pathogens and to detect them when present in dry foods in very low numbers should be developed. The goal should be to advance our knowledge of the behavior of foodborne pathogens in low-aw foods and food ingredients, with the ultimate aim of developing and implementing interventions that will reduce foodborne illness associated with this food category. Presented here are some observations on survival and persistence of foodborne pathogens in low-aw foods, selected outbreaks of illnesses associated with consumption of these foods, and approaches to minimize safety risks
    Sustainability effects of household-scale biogas in rural China
    Gosens, J. ; Lu Yonglong, ; He Guizhen, ; Bluemling, B. ; Beckers, T.A.M. - \ 2013
    Energy Policy 54 (2013). - ISSN 0301-4215 - p. 273 - 287.
    indoor air-pollution - energy-consumption - fuel use - developing-countries - jiangxi province - developing-world - cooking fuels - digesters - areas - demand
    Households in rural China rely heavily on low quality fuels which results in reduced quality of life and environmental degradation. This study assesses the comparative contribution of household scale biogas installations to the broad set of sustainability objectives in the Chinese biogas policy framework, which targets household budget, fuel collection workload, forest degradation, indoor air quality and health, renewable energy supply, and climate change. A household survey was used to determine how biogas affected consumption levels of crop residues, fuel wood, coal, LPG, and electricity. Biogas users were found to reduce consumption of biomass fuels but not coal. Although LPG is not a highly commonly used fuel in rural China, biogas users nearly cease to use it altogether. A big reduction in fuel wood consumption results in strongly reduced workload and forest degradation. Although household scale biogas has alleviated all sustainability issues targeted by Chinese policies, low quality fuel use remains abundant, even in households using biogas. Continued promotion of the construction of biogas installations is advisable, but additional policies are needed to ensure higher quality heating energy supply and cleaner uses of biomass fuels.
    Changes and challenges: China's environmental management in transition
    He, G. ; Lu, Y. ; Mol, A.P.J. ; Beckers, T.A.M. - \ 2012
    Environmental Development 3 (2012)juli 2012. - ISSN 2211-4645 - p. 25 - 38.
    China's 12th Five-Year Plan (2011–2015) announces a shift to a new development model and a new green governance approach. Can we indeed identify a specific Chinese transition mode in moving from a monolithic economic growth path to a sincere green development model? To understand China's environmental management transition and address this question we assess whether and to what extent China has been shifting course in resource use and limiting environmental pollution. This review paper provides a comprehensive overview of the development of environmental management in China based on existing sources of information. Four major environmental challenges are identified for the future environmental management of the biggest emerging economy in the world.
    Sustainable technologies and everyday life
    Spaargaren, G. ; Martens, S.G. ; Beckers, T.A.M. - \ 2006
    In: User Behavior and Technology Development / Verbeek, P.P., Slob, A., Berlijn : Springer (Eco-Efficiency in Industry and Science 20) - ISBN 9781402044335 - 412 p.
    High rate treatment of terephthalic acid production wastewater in a two-stage anaerobic bioreactor
    Kleerebezem, R. ; Beckers, J. ; Pol, L.W.H. ; Lettinga, G. - \ 2005
    Biotechnology and Bioengineering 91 (2005)2. - ISSN 0006-3592 - p. 169 - 179.
    4-methylbenzoic acid - baffled reactor - degradation - performance - inhibition - digestion - industry - isomers - sludge
    The feasibility was studied of anaerobic treatment of wastewater generated during purified terephthalic acid (PTA) production in two-stage upflow anaerobic sludge blanket (UASB) reactor system. The artificial influent of the system contained the main organic substrates of PTA-wastewater: acetate, benzoate, and terephthalate. Three parallel operated reactors were used for the second stage, and seeded with a suspended terephthalate degrading culture, with and without additional methanogenic granular sludge (two different types). The first stage UASB-reactor was seeded with methanogenic granular sludge. Reactors were operated at 37 degrees C and pH 7. During the first 300 days of operation a clear distinction between the biomass grown in both reactor stages was obtained. In the first stage, acetate and benzoate were degraded at a volumetric loading rate of 40 g-COD/L (.) day at a COD-removal efficiency of 95% within the first 25 days of operation. No degradation of terephthalate was obtained in the first stage during the first 300 days of operation despite operation of the reactor at a decreased volumetric loading rate with acetate and benzoate of 9 g-COD/L (.) day from day 150. Batch incubation of biomass from the reactor with terephthalate showed that the lag-phase prior to terephthalate degradation remained largely unchanged, indicating that no net growth of terephthalate degrading biomass occurred in the first stage reactor. From day 300, however, terephthalate degradation was observed in the first stage, and the biomass in this reactor could successfully be enriched with terephthalate degrading biomass, resulting in terephthalate removal capacities of 15 g-COD/L (.) day. Even though no single reason could be identified why (suddenly) terephthalate degradation was obtained after such a long period of operation, it is suggested that the solid retention time as well the prevailing reactor concentrations acetate and benzoate may have played an important role. From day 1 of operation, terephthalate was degraded in the second stage. In presence of methanogenic granular biomass, high terephthalate removal capacities were obtained in these reactors (15 g-COD/L (.) day) after approximately 125 days of operation. From the results obtained it is concluded that terephthalate degradation is the bottleneck during anaerobic treatment of PTA-wastewater. Pre-removal of acetate and benzoate in staged bioreactor reduces the lag-phase prior to terephthalate degradation in latter stages, and enables high rate treatment of PTA-wastewater. (c) 2005 Wiley Periodicals, Inc.
    Analysis of acetylated wood by electron microscopy
    Sander, C. ; Beckers, E.P.J. ; Militz, H. ; Veenendaal, W. van - \ 2003
    Wood Science and Technology 37 (2003)1. - ISSN 0043-7719 - p. 39 - 46.
    dimensional stability
    The properties of acetylated solid wood were investigated earlier, in particular the anti-shrink efficiency and the resistance against decay. This study focuses on the possible changes and damage to the wood structure due to an acetylation process leading to weight per cent gains of up to 20%. Electron microscopy (SEM and TEM) was used to investigate the fine structure of acetylated beech, pine and spruce. Cell wall swelling was observed, but no evidence of damage could be seen as a result of the acetylation procedure. The fine structure of the wood tissue such as the pits and the thin parenchyma walls appeared untouched
    De duurzame consument: pleidooi voor een nieuwe aanpak
    Beckers, T.A.M. ; Spaargaren, G. - \ 2003
    In: Duurzaam milieugebruik. Een inspiratiebron Utrecht : Jan van Arkel - ISBN 9789062244515 - p. 263 - 279.
    Gedragspraktijken in Transitie. De gedragspraktijkenbenadering getoetst in twee gevallen: Duurzaam wonen en Duurzaam toeristische mobiliteit
    Spaargaren, G. ; Beckers, T.A.M. ; Martens, S. ; Bargeman, B. ; Es, T. van - \ 2002
    Tilburg/Wageningen : Globus/Wageningen Universiteit - 37 p.
    Plasma concentrations of bovine pregnancy-associated glycoprotein during ongoing pregnancies after transfer of in vitro-produced bovine embryos
    Vos, P.L.A.M. ; Perenyi, Z. ; Jonker, F.H. ; Ruigh, L. de; Wagtendonk, A.M. van; Breukelman, S. ; Soede, N.M. ; Taverne, M.A.M. ; Beckers, J.F. ; Dieleman, S.J. - \ 2001
    In: International Embryo Transfer Society, Quebec, Canada, 2001 - p. 328 - 328.
    Intercultivar variation in the proportions of wheat protein fractions and relation to mixing behaviour
    Vereijken, J.M. ; Klostermann, V.L.C. ; Beckers, F.H.R. ; Spekking, W.T.J. ; Graveland, A. - \ 2000
    Journal of Cereal Science 32 (2000)2. - ISSN 0733-5210 - p. 159 - 167.
    Van gedragspraktijk naar beleidspraktijk; een analytisch instrument voor een consument-georiënteerd milieubeleid
    Beckers, T.A.M. ; Spaargaren, G. ; Bargeman, B. - \ 2000
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