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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Uncovering the economic value of natural enemies and true costs of chemical insecticides to cotton farmers in China
Huang, Jikun ; Zhou, Ke ; Zhang, Wei ; Deng, Xiangzheng ; Der Werf, Wopke van; Lu, Yanhui ; Wu, Kongming ; Rosegrant, Mark W. - \ 2018
Environmental Research Letters 13 (2018)6. - ISSN 1748-9318
biological control - economic value - insecticides - natural enemies - smallholder farming

Little empirical evidence on the economic value of biological control of pests at farm level is available to improve economic decision-making by farmers and policy makers. Using insect sampling and household survey in an integrated bio-economic analysis framework, this paper studies farmers' crop management practices in cotton in the North China Plain, and estimates the marginal value of natural enemies and costs of chemical insecticides to farmers. Ladybeetles (mainly Harmonia axyridis, Propylea japonica, and Coccinella septempunctata), the dominant natural enemy group that controls the primary pest (aphid) in cotton in our study area, provide a significant economic benefit that is unknown to the farmers. Even at the current high levels of insecticide use, an additional ladybeetle provides an economic benefit of 0.05 CNY (almost USD 0.01) to farmers. The use of broad-spectrum insecticides by farmers is alarmingly excessive, not only undermining farmers' cotton profitability but also inducing social costs as well as disruption of the natural pest suppression system. Doubling current ladybeetle density in cotton field could gain an estimated USD 300 million for cotton farmers in China, providing a strong economic case for policies to move the pest control system towards a more ecologically-based regime, with positive consequences for farm income and environmental health. With rising use of biological control service provided by natural enemies such as ladybeetles in cotton fields, significant falls in farmers' insecticide use would be expected, which could raise the value of ladybeetles and other natural enemies even further. The results indicate that there is an urgent need to rationalize inputs and move forward to improved agro-ecosystem management in smallholder farming system. Raising knowledge and awareness on the costs and value of biological pest control versus insecticides among farmers and policy makers and having effective extension service, are priorities towards achieving a more ecologically-based approach to crop protection on smallholder farms.

Unravelling the causes of tidal asymmetry in deltas
Zhang, Wei ; Cao, Yu ; Zhu, Yuliang ; Zheng, Jinhai ; Ji, Xiaomei ; Xu, Yanwen ; Wu, Yao ; Hoitink, A.J.F. - \ 2018
Journal of Hydrology 564 (2018). - ISSN 0022-1694 - p. 588 - 604.
Deltas - Nonstationary tides - River flow - Tidal asymmetry

Tidal asymmetry in deltas is caused by both the intrinsic asymmetry, resulting from the combination of astronomical tides, and by nonlinear tidal interactions that occur in shallow water. The relative importance of these sources of tidal asymmetry in delta channel networks have remained poorly studied, partly due to the limitations of classical harmonic analysis (HA) in hindcasting nonstationary tides. The Pearl River Delta (PRD) is a multichannel system with rapidly changing bathymetry, subject to severe human interventions. This work applies a nonstationary harmonic model (NS_TIDE) to hydrological data from 15 stations in the PRD spanning the period 1961–2012. The spatiotemporal variation of multiple sources of tidal asymmetry is quantified by a skewness metric, revealing how similar or dissimilar the development of alternative sources of tidal asymmetry develop in the delta subject to study. A relative sensitivity coefficient (RSC) is introduced to decompose the contribution of tidal amplitude variations to multiple tidal asymmetries. Analytical results show the development of tides becoming gradually more asymmetric as they propagate into delta channel networks, and how this depends on the river flow. Variation in the orientation of tidal asymmetries induced by different combinations of tidal constituents leads to a complex pattern of the overall tidal asymmetry in the PRD. Our results show that tidal asymmetry in deltas can be significantly dependent on the river flow.

Inter-laboratory study for the certification of trace elements in seawater certified reference materials NASS-7 and CASS-6
Yang, Lu ; Nadeau, Kenny ; Meija, Juris ; Grinberg, Patricia ; Pagliano, Enea ; Ardini, Francisco ; Grotti, Marco ; Schlosser, Christian ; Streu, Peter ; Achterberg, Eric P. ; Sohrin, Yoshiki ; Minami, Tomoharu ; Zheng, Linjie ; Wu, Jingfeng ; Chen, Gedun ; Ellwood, Michael J. ; Turetta, Clara ; Aguilar-Islas, Ana ; Rember, Robert ; Sarthou, Géraldine ; Tonnard, Manon ; Planquette, Hélène ; Matoušek, Tomáš ; Crum, Steven ; Mester, Zoltán - \ 2018
Analytical and Bioanalytical Chemistry 410 (2018)18. - ISSN 1618-2642 - p. 4469 - 4479.
Certification of trace metals in seawater certified reference materials (CRMs) NASS-7 and CASS-6 is described. At the National Research Council Canada (NRC), column separation was performed to remove the seawater matrix prior to the determination of Cd, Cr, Cu, Fe, Pb, Mn, Mo, Ni, U, V, and Zn, whereas As was directly measured in 10-fold diluted seawater samples, and B was directly measured in 200-fold diluted seawater samples. High-resolution inductively coupled plasma mass spectrometry (HRICPMS) was used for elemental analyses, with double isotope dilution for the accurate determination of B, Cd, Cr, Cu, Fe, Pb, Mo, Ni, U, and Zn in seawater NASS-7 and CASS-6, and standard addition calibration for As, Co, Mn, and V. In addition, all analytes were measured using standard addition calibration with triple quadrupole (QQQ)-ICPMS to provide a second set of data at NRC. Expert laboratories worldwide were invited to contribute data to the certification of trace metals inNASS-7 and CASS-6.
Various analytical methods were employed by participants including column separation, co-precipitation, and simple dilution coupled to ICPMS detection or flow injection analysis coupled to chemiluminescence detection, with use of double isotope dilution calibration, matrix matching external calibration, and standard addition calibration. Results presented in this study show that majority of laboratories have demonstrated their measurement capabilities for the accurate determination of trace metals in seawater. As a result of this comparison, certified/reference values and associated uncertainties were assigned for 14 elements in seawater CRMs NASS-7 and CASS-6, suitable for the validation of methods used for seawater analysis.
Genome editing by natural and engineered CRISPR-associated nucleases
Wu, Wen Y. ; Lebbink, Joyce H.G. ; Kanaar, Roland ; Geijsen, Niels ; Oost, John van der - \ 2018
Nature Chemical Biology 14 (2018)7. - ISSN 1552-4450 - p. 642 - 651.

Over the last decade, research on distinct types of CRISPR systems has revealed many structural and functional variations. Recently, several novel types of single-polypeptide CRISPR-associated systems have been discovered including Cas12a/Cpf1 and Cas13a/C2c2. Despite distant similarities to Cas9, these additional systems have unique structural and functional features, providing new opportunities for genome editing applications. Here, relevant fundamental features of natural and engineered CRISPR-Cas variants are compared. Moreover, practical matters are discussed that are essential for dedicated genome editing applications, including nuclease regulation and delivery, target specificity, as well as host repair diversity.

Architecting integrated internet of things systems
Köksal, Ömer - \ 2018
University. Promotor(en): Bedir Tekinerdogan. - Wageningen : Wageningen University - ISBN 9789463438544 - 218
Effects of structure on hydrogel microbead function
Leusden, Pauline van - \ 2018
University. Promotor(en): Erik van der Linden; Leonard Sagis. - Wageningen : Wageningen University - ISBN 9789463438568 - 136
Inheritance of nonhost resistance of barley to the powdery mildew fungi of cereals and grasses
Romero, Cynara C.T. - \ 2018
University. Promotor(en): Richard Visser, co-promotor(en): Rients Niks. - Wageningen : Wageningen University - ISBN 9789463437820 - 128
Law & disorder : the unusual case of weak colloidal solids
Higler, Ruben Frederik - \ 2018
University. Promotor(en): Jasper van der Gucht, co-promotor(en): Joris Sprakel. - Wageningen : Wageningen University - ISBN 9789463438698 - 219
Transport of silver nanoparticles in the soil-water nexus
Mahdi, Karrar Najah - \ 2018
University. Promotor(en): Violette Geissen; Coen Ritsema, co-promotor(en): Ruud Peters; Jantiene Baartman. - Wageningen : Wageningen University - ISBN 9789463432764 - 123
Cooperation, institutions and sustainable development: empirical evidence from China
Nie, Zihan - \ 2018
University. Promotor(en): Erwin Bulte; Q. Tu, co-promotor(en): Nico Heerink. - Wageningen : Wageningen University - ISBN 9789463437844 - 162
Chinese farmers’ cooperatives and smallholder farmers
Hao, Jinghui - \ 2018
University. Promotor(en): Wim Heijman, co-promotor(en): Nico Heerink; Jos Bijman. - Wageningen : Wageningen University - ISBN 9789463437851 - 145
Does intercropping have a future in China? : insights from a case study in Gansu Province
Hong, Yu - \ 2018
University. Promotor(en): Erwin Bulte, co-promotor(en): Nico Heerink; Wopke van der Werf. - Wageningen : Wageningen University - ISBN 9789463437790 - 189
Mechanistic and biocatalytic enzymology of flavoprotein oxidases
Ewing, Tom A. - \ 2018
University. Promotor(en): Willem van Berkel. - Wageningen : Wageningen University - ISBN 9789463438650 - 235
Sediments in the Tema Harbour (Ghana): chemical pollution and sedimentation rates
Botwe, Benjamin Osei - \ 2018
University. Promotor(en): Piet Lens. - Leiden : CRC Press/Balkema - ISBN 9781138323513 - 270
Treatment of petroleum refinery wastewater with constructed wetlands
Mustapha, Hassana Ibrahim - \ 2018
University. Promotor(en): Piet Lens. - Leiden : CRC Press/Balkema - ISBN 9781138324398 - 277
Flies are what they eat : Tailoring nutrition of Black Soldier Fly (Hermetia illucens L.) for larval biomass production and fitness
Barragán-Fonseca, Karol B. - \ 2018
University. Promotor(en): Joop van Loon; Marcel Dicke. - Wageningen : Wageningen University - ISBN 9789463432931 - 159
In vitro gastric digestion of protein-based structured food : An engineering approach
Luo, Qi - \ 2018
University. Promotor(en): Remko Boom, co-promotor(en): Anja Janssen. - Wageningen : Wageningen University - ISBN 9789463437707 - 174
The impact of diseases in dairy cows on greenhouse gas emissions and economic performance
Mostert, Pim - \ 2018
University. Promotor(en): Imke de Boer, co-promotor(en): Eddy Bokkers; Corina van Middelaar. - Wageningen : Wageningen University - ISBN 9789463432740 - 150
Butyrate in broiler diets : impact of butyrate presence in distinct gastrointestinal tract segments on digestive function, microbiota composition and immune responses
Moquet, Pierre C.A. - \ 2018
University. Promotor(en): Wouter Hendriks, co-promotor(en): Rene Kwakkel. - Wageningen : Wageningen University - ISBN 9789463437745 - 214
More milking days with lower yields : sustainability impacts of short or no dry periods in dairy cows
Kok, Akke - \ 2018
University. Promotor(en): Imke de Boer; Bas Kemp, co-promotor(en): Ariette van Knegsel; Corina van Middelaar. - Wageningen : Wageningen University - ISBN 9789463438346 - 184
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