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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Next-generation information to support a sustainable course for European forests
Nabuurs, Gert Jan ; Verweij, Peter ; Eupen, Michiel van; Pérez-Soba, Marta ; Pülzl, Helga ; Hendriks, Kees - \ 2019
Nature Sustainability 2 (2019)9. - ISSN 2398-9629 - p. 815 - 818.

A novel European Union forest policy based on the best and most up-to-date information available is urgently needed. Without such change, forests will not provide the resources we need and will suffer heavily under climate change. Forest inventories and many information sources exist in all countries but are not properly used in European Union policymaking. We introduce a next-generation information tool that portrays a synchronized top-down European forest management strategies map, spatially weighing the multifunctionality of European forests.

Improving meat colour and oxidative stability by antioxidant supplementation of light weight lamb diets
Leal, Leonel N. - \ 2019
Wageningen University. Promotor(en): W.H. Hendriks; L.A. den Hartog, co-promotor(en): J. Martín-Tereso. - Wageningen : Wageningen University - ISBN 9789463950466 - 189
Mapping Geospatial Processes Affecting the Environmental Fate of Agricultural Pesticides in Africa
Hendriks, Chantal M.J. ; Gibson, Harry S. ; Trett, Anna ; Python, André ; Weiss, Daniel J. ; Vrieling, Anton ; Coleman, Michael ; Gething, Peter W. ; Hancock, Penny A. ; Moyes, Catherine L. - \ 2019
International Journal of Environmental Research and Public Health 16 (2019)19. - ISSN 1660-4601
artificial compound - crop protection - environmental data - insecticide residue - satellite data - tropics

The application of agricultural pesticides in Africa can have negative effects on human health and the environment. The aim of this study was to identify African environments that are vulnerable to the accumulation of pesticides by mapping geospatial processes affecting pesticide fate. The study modelled processes associated with the environmental fate of agricultural pesticides using publicly available geospatial datasets. Key geospatial processes affecting the environmental fate of agricultural pesticides were selected after a review of pesticide fate models and maps for leaching, surface runoff, sedimentation, soil storage and filtering capacity, and volatilization were created. The potential and limitations of these maps are discussed. We then compiled a database of studies that measured pesticide residues in Africa. The database contains 10,076 observations, but only a limited number of observations remained when a standard dataset for one compound was extracted for validation. Despite the need for more in-situ data on pesticide residues and application, this study provides a first spatial overview of key processes affecting pesticide fate that can be used to identify areas potentially vulnerable to pesticide accumulation.

State updating of root zone soil moisture estimates of an unsaturated zone metamodel for operational water resources management
Pezij, Michiel ; Augustijn, Denie C.M. ; Hendriks, Dimmie M.D. ; Weerts, Albrecht H. ; Hummel, Stef ; Velde, Rogier van der; Hulscher, Suzanne J.M.H. - \ 2019
Journal of Hydrology 4 (2019). - ISSN 0022-1694
Data assimilation - Ensemble Kalman filter - Hydrological modelling - Metamodelling - Remote sensing - SMAP - Soil moisture

Combining metamodels with data assimilation schemes allows the incorporation of up-to-date information in metamodels, offering new opportunities for operational water resources management. We developed a data assimilation scheme for the unsaturated zone metamodel MetaSWAP using OpenDA, which is an open source data assimilation framework. A twin experiment showed the feasibility of applying an Ensemble Kalman filter as a data assimilation method for updating metamodels. Furthermore, we assessed the accuracy of root zone soil moisture model estimates when assimilating the regional SMAP L3 Enhanced surface soil moisture product. The model accuracy is assessed using in situ soil moisture measurements collected at 12 locations in the Twente region, the Netherlands. Although the accuracy of the model estimates does not improve in terms of correlation coefficient, the accuracy does improve in terms of Root Mean Square Error and bias. Therefore, the assimilation of surface soil moisture observations has value for updating root zone soil moisture model estimates. In addition, the accuracy of the model estimates improves on both regional and local spatial scales. The increasing availability of remotely sensed soil moisture data will lead to new possibilities for integrating metamodelling and data assimilation in operational water resources management. However, we expect that significant investments in computational capacities are necessary for effective implementation in decision-making.

De kleine bijenkastkever (Aethina tumida)
Hendriks, Marc - \ 2019
Gaining insights in the nutritional metabolism of amphibians: analysing body nutrient profiles of the African clawed frog, Xenopus laevis
Brenes-Soto, Andrea ; Dierenfeld, E.S. ; Bosch, G. ; Hendriks, W.H. ; Janssens, Geert P.J. - \ 2019
PeerJ 7 (2019). - ISSN 2167-8359
Metabolism - Nutrition - Xenopus laevis - Body composition - Amino acids - Fatty acids
Whole bodies of Xenopus laevis (n = 19) were analysed for chemical composition and morphometrics. The nutrient profile (macronutrients, amino acids, fatty acids and minerals) was evaluated by sex; interactions among variables with body weights and lengths, and comparisons made with different species of marine and fresh water fish. Significant differences were found in morphometric measurements, water content, several minerals and fatty acids between sexes of X. laevis. Amino acid profiles differed in methionine, proline and cysteine, which could underlie different metabolic pathways in frogs when compared to fish. In addition, fatty acid profiles revealed more monounsaturated and n − 6 polyunsaturated fatty acids in frogs than in fish, more similar to values reported for terrestrial than aquatic vertebrates. Important interactions were also found between body measurements and fat, calcium, and phosphorus, as well as between essential and non-essential amino acids. The results indicate that frogs might have particular biochemical pathways for several nutrients, dependent on sex and linked to body weight, which ultimately could reflect specific nutrient needs
Water flow in soils with heterogeneous macropore geometries
Faúndez Urbina, C.A. ; Dam, J.C. van; Hendriks, R.F.A. ; Berg, F. van den; Gooren, H.P.A. ; Ritsema, C.J. - \ 2019
Vadose Zone Journal 18 (2019)1. - ISSN 1539-1663

Heterogeneous macroporous geometries (HMGs) comprise unevenly distributed macropores with depth. A large variety of macropore distributions produce fast water flow and chemical transport that deviate from uniform flow. We analyzed the measured pressure head and outflow in column experiments with a uniform matrix (Exp. I), one central macropore (main bypass) (Exp. II), and HMG (Exp. III) and evaluated the performance of the models HYDRUS-1D and SWAP under these conditions. Two replicate soil columns were prepared with a 62-cm silty loam layer above a 5-cm sandy loam layer. Well-defined infiltration and drainage conditions were applied to top and bottom boundaries, respectively. Pressure head and outflow were measured at short time intervals, and calibration was performed by PEST. Experiment I was conducted to calibrate the matrix parameters and Exp. II to calibrate macropore parameters. In Exp. III, four dead-end macropores were created around the main bypass, and the models were run using the previously calibrated parameters, updating only the macropore geometry parameters. The results indicated that HMGs increased total macropore influx, especially in the internal catchment domain. Interaction between the internal catchment, main bypass, and matrix domains was necessary for explaining the change in cumulative outflow and outflow onset observations. The simulations with both models were accurate for HMG regarding pressure head and outflow. The implicit representation of HMGs by HYDRUS-1D improved outcomes for cumulative outflow, whereas the explicit representation by SWAP improved results for lateral mass transfer. The ability to model the effects of HMGs is essential for environmental and agricultural studies.

Poultry and pig nutrition: challenges of the 21st century
Hendriks, Wouter H. ; Verstegen, Martin W.A. ; Babinszky, László - \ 2019
Wageningen : Wageningen Academic Publishers - ISBN 9789086863334 - 428
Distant Non-Obvious Mutations Influence the Activity of a Hyperthermophilic Pyrococcusfuriosus Phosphoglucose Isomerase
Subramanian, Kalyanasundaram ; Mitusińska, Karolina ; Raedts, John ; Almourfi, Feras ; Joosten, Henk Jan ; Hendriks, Sjon ; Sedelnikova, Svetlana E. ; Kengen, Servé W.M. ; Hagen, Wilfred R. ; Góra, Artur ; Martins Dos Santos, Vitor A.P. ; Baker, Patrick J. ; Oost, John van der; Schaap, Peter J. - \ 2019
Biomolecules 9 (2019)6. - ISSN 2218-273X
Comulator - cupin phosphoglucose isomerase - Protein engineering - Pyrococcus furiosus - solvent access

The cupin-type phosphoglucose isomerase (PfPGI) from the hyperthermophilic archaeon Pyrococcus furiosus catalyzes the reversible isomerization of glucose-6-phosphate to fructose-6-phosphate. We investigated PfPGI using protein-engineering bioinformatics tools to select functionally-important residues based on correlated mutation analyses. A pair of amino acids in the periphery of PfPGI was found to be the dominant co-evolving mutation. The position of these selected residues was found to be non-obvious to conventional protein engineering methods. We designed a small smart library of variants by substituting the co-evolved pair and screened their biochemical activity, which revealed their functional relevance. Four mutants were further selected from the library for purification, measurement of their specific activity, crystal structure determination, and metal cofactor coordination analysis. Though the mutant structures and metal cofactor coordination were strikingly similar, variations in their activity correlated with their fine-tuned dynamics and solvent access regulation. Alternative, small smart libraries for enzyme optimization are suggested by our approach, which is able to identify non-obvious yet beneficial mutations.

Low awareness, adherence, and practice but positive attitudes regarding lifestyle recommendations among non–muscle-invasive bladder cancer patients
Westhoff, Ellen ; Kampman, Ellen ; Aben, Katja K. ; Hendriks, Inge G. ; Witjes, Johannes Alfred ; Kiemeney, Lambertus A. ; Vrieling, Alina - \ 2019
Urology Oncology: Seminars and Original Investigations 37 (2019)9. - ISSN 1078-1439 - p. 573.e1 - 573.e8.
Advice - Attitude - Awareness - Lifestyle recommendations - Non–muscle-invasive bladder cancer

Background: A healthy lifestyle may reduce the risk of non–muscle-invasive bladder cancer (NMIBC)recurrence. The objective of this study was to obtain insight in whether NMIBC patients are aware of possible risk factors for (bladder)cancer, adhere to lifestyle recommendations for cancer prevention, received lifestyle advice from their physician, and what their attitudes are towards physicians giving lifestyle advice. Methods: Patients with newly diagnosed NMIBC between 2014 and 2017 participating in the UroLife cohort study completed questionnaires at 6 weeks and 3 months after diagnosis about awareness of (bladder)cancer risk factors, adherence to lifestyle recommendations, reception of lifestyle advice, and attitudes towards physicians giving lifestyle advice. Results: A total of 969 NMIBC patients were included (response rate 46%). Most patients (89%)were aware that smoking is a risk factor for cancer, and knowledge of other risk factors for cancer varied between 29% (low fruit and vegetable consumption)and 67% (overweight). Adherence to cancer prevention recommendations varied between 34% (body weight)and 85% (smoking). Of the smokers, 70% reported they were advised to quit, and 36% quit smoking in the three months before or after diagnosis. Only 21% of all patients indicated they received other lifestyle advice. More than 80% of patients had a positive attitude towards receiving lifestyle advice from their physician. Conclusions: These findings show that awareness of (bladder)cancer risk factors and adherence to cancer prevention lifestyle recommendations among NMIBC patients is low and that physicians’ information provision should be improved.

Stability of creatine monohydrate and guanidinoacetic acid during manufacture (retorting and extrusion) and storage of dog foods
Poel, Antonius F.B. van der; Braun, Ulrike ; Hendriks, Wouter H. ; Bosch, Guido - \ 2019
Journal of Animal Physiology and Animal Nutrition (2019). - ISSN 0931-2439
additive - creatinine - guanidinoacetic acid - heat sterilisation - stability - uniformity

The stability of creatine monohydrate (CrMH), crystallised guanidinoacetic acid (GAA-C) and granulated GAA (GAA-G) in a moist retorted and a dry extruded dog food formulation during production and storage was investigated. Commercial food mixtures were supplemented with CrMH, GAA-C or GAA-G. Uniformity after mixing and retorting or extrusion was determined based on replicate samples (moist n = 8, dry n = 10). Storage stability was evaluated at 25°C/60% relative humidity for 15 months and 40°C/75% for 6 months. Foods with CrMH were analysed for creatine (Cr) and creatinine (Crn), whereas GAA-C and GAA-G foods were analysed for GAA concentrations. Coefficients of variation (CV) for uniformity of the additives after mixing of moist and dry pet food formulations were below 15%, and the CV was lower in processed mixtures. Recoveries after retorting and extrusion were higher for GAA-G (79 and 99%) and GAA-C (89 and 86%) compared to CrMH (36 and 85%) foods. In moist CrMH food, Cr concentrations re-increased by 54% whilst Crn concentrations decreased by 39% after storage at 25°C for 15 months. With total molar Cr + Crn remaining stable throughout storage, Crn and Cr appeared to effectively interconvert. Storage of the extruded CrMH food at 25°C for 15 months resulted in a 63% decrease in Cr and a 39% increase in Crn concentration. The decrease in Cr concentration was larger at 6 months storage at 40°C compared to 15 months storage at 25°C. Both GAA-C and GAA-G moist and dry foods were stable during storage (<10% decrease). This study showed that GAA is highly stable during production and storage of moist and dry canine foods whilst CrMH is relatively unstable, particularly during storage. The latter makes it difficult to establish a guaranteed Cr content in finished moist retorted and dry extruded foods with CrMH.

Alstroemeria wordt onderworpen aan fossielvrij en emissieloos teeltconcept. Telers en onderzoekers op weg naar Teelt van de Toekomst
Garcia Victoria, Nieves ; Hendriks, Stefan - \ 2019
Storage of fungal treated lignocellulosic biomass and its acceptance by goats
Mao, Lei - \ 2019
Wageningen University. Promotor(en): W.H. Hendriks, co-promotor(en): J.W. Cone; A.S.M. Sonnenberg. - Wageningen : Wageningen University - ISBN 9789463439060 - 156
When can legacy soil data be used, and when should new data be collected instead?
Hendriks, C.M.J. ; Stoorvogel, J.J. ; Lutz, F. ; Claessens, L. - \ 2019
Geoderma 348 (2019). - ISSN 0016-7061 - p. 181 - 188.
Conventional soil map - Sampling effort - Scale level - Soil data acquisition - Soil data warehouses - Soil survey

Soil data requirements and soil data acquisition tools and techniques have changed over recent decades. In general, soil scientists can: i) collect new data in the field and ignore the data that are available, ii) rely entirely on legacy soil data or iii) combine available legacy data with new data collection. This study aims to analyse and discuss the choices soil scientists make to balance between the use of legacy soil data and the collection of new soil data. A literature review on soil data acquisition was carried out and illustrated that the use of legacy soil data is still often very limited, while soil data availability increased over recent decades. Studies that use legacy soil data often use conventional soil data, which are criticised in literature. A regional and local case study was carried out to illustrate the choices that have to be made for obtaining the required soil data. It turned out that both case studies preferred to combine new soil data collection and legacy soil data. Many of the reviewed studies could reduce their sampling effort by making better use of available data, tools and techniques. Besides, soil scientists can help facilitating soil data acquisition by developing soil data warehouses.

The value of corn stover for Chinese dairy farms
He, Yuan - \ 2019
Wageningen University. Promotor(en): W.H. Hendriks; J. Dijkstra, co-promotor(en): J.W. Cone. - Wageningen : Wageningen University - ISBN 9789463439176 - 198
The effect of disaggregating soil data for estimating soil hydrological parameters at different scales
Stoorvogel, J.J. ; Mulder, V.L. ; Hendriks, C.M.J. - \ 2019
Geoderma 347 (2019). - ISSN 0016-7061 - p. 185 - 193.
Pedotransfer functions - Soil survey - Soil variability - Water holding capacity

There is an increasing demand for soil data at different scales. Due to changing data requirements, environmental studies need to make key decisions in terms of i) which datasets to use, and ii) how to derive the necessary data from these datasets. This is particularly true for properties that are not included in standard soil profile descriptions like many soil hydrological properties. Often, data are disaggregated to account for spatial variability and processed using e.g., pedotransfer functions to derive the soil hydrological properties. However, the effect of disaggregation and the use of pedotransfer functions is often unclear. This paper aims to illustrate the potential effects by looking at three different case studies at the global, regional and local scale. The three cases clearly show that the disaggregation of data has considerable effect on the estimate of the water holding capacity and its spatial distribution. At the regional and local scale, actual measurements of the water holding capacity also differed considerably from the results of the pedotransfer functions. It is concluded that the choice of datasets and the procedures to derive the water holding capacity really matter. Too often, studies take a published dataset and a method without additional evaluation. It is recommended to pay more attention to these elements and carry out ensemble runs using different datasets and carry out comparative analysis using different methods to provide better insight in the accuracy of the final outcomes.

Dietary supplementation of 11 different plant extracts on the antioxidant capacity of blood and selected tissues in lightweight lambs
Leal, Leonel N. ; Jordán, María J. ; Bello, José M. ; Otal, Julio ; Hartog, Leo A. den; Hendriks, Wouter H. ; Martín-Tereso, Javier - \ 2019
Journal of the Science of Food and Agriculture 99 (2019)9. - ISSN 0022-5142 - p. 4296 - 4303.
kidney - lambs - liver - muscle - plant extracts - plasma

BACKGROUND: Due to the growing public concern regarding the addition of chemical antioxidants to foods, focus has shifted towards natural alternatives. Because of their antioxidant potential, culinary herbs and spices have long been used to extend the shelf-life of foods. However, a better understanding of the fate of these products following intake is required to assess their use in lamb diets. RESULTS: Two hundred and eighty-eight Rasa Aragonesa male lambs (70 days old) were supplemented (5.0 g kg −1 compound feed) with bay, marjoram, oregano, rosemary, thyme, turmeric, cumin, caraway, dill, cinnamon and nutmeg extracts for 14 days before slaughter. Dietary supplementation with plant extracts had no effect on intake, growth performance or antioxidant activity in blood (TEAC values). In muscle, nutmeg supplementation increased (P < 0.05) the radical-scavenging capacity (TEAC), whereas a decrease in the radical-scavenging capacity was found for lambs supplemented with oregano, dill, cinnamon and nutmeg (ORAC values). In liver, nutmeg supplementation increased (P < 0.05) the antioxidant capacity (TEAC), whereas bay (ORAC), turmeric, cinnamon and nutmeg (DPPH values) decreased (P < 0.05) the radical-scavenging capacity of the tissue. In kidney, a lower (P < 0.05) radical-scavenging capacity (TEAC values) was found in lambs supplemented with oregano, cumin and caraway, whereas, turmeric, cumin, caraway, cinnamon and nutmeg increased (P < 0.05) the antioxidant capacity (ORAC values) in kidney. CONCLUSION: Supplementation of lamb diets with plant extracts affected radical-scavenging activity in muscle, liver and kidney. However, due to the divergent results of the different assays for the same tissue, it is not advisable to discriminate plant extracts using this approach.

Evaluation of fungal degradation of wheat straw cell wall using different analytical methods from ruminant nutrition perspective
Nayan, Nazri ; Erven, Gijs van; Kabel, Mirjam A. ; Sonnenberg, Anton S.M. ; Hendriks, Wouter H. ; Cone, John W. - \ 2019
Journal of the Science of Food and Agriculture 99 (2019)8. - ISSN 0022-5142 - p. 4054 - 4062.
carbohydrates - in vitro gas production - lignin - lignin quantification - pyrolysis-GC/MS - white-rot fungi

BACKGROUND: White rot fungi have been used to improve the nutritive value of lignocellulose for ruminants. In feed analysis, the Van Soest method is widely used to determine the cell wall contents. To assess the reliability of this method (Method A) for determination of cell wall contents in fungal-treated wheat straw, we compared a combined monosaccharide analysis and pyrolysis coupled to gas chromatography with mass spectrometry (Py-GC/MS) (Method B). Ruminal digestibility, measured as in vitro gas production (IVGP), was subsequently used to examine which method explains best the effect of fungal pretreatment on the digestibility of wheat straw. RESULTS: Both methods differed considerably in the mass recoveries of the individual cell wall components, which changed on how we assess their degradation characteristics. For example, Method B gave a higher degradation of lignin (61.9%), as compared to Method A (33.2%). Method A, however, showed a better correlation of IVGP with the ratio of lignin to total structural carbohydrates, as compared to Method B (Pearson's r of −0.84 versus −0.69). Nevertheless, Method B provides a more accurate quantification of lignin, reflecting its actual modification and degradation. With the information on the lignin structural features, Method B presents a substantial advantage in understanding the underlying mechanisms of lignin breakdown. Both methods, however, could not accurately quantify the cellulose contents – among others, due to interference of fungal biomass. CONCLUSION: Method A only accounts for the recalcitrant residue and therefore is more suitable for evaluating ruminal digestibility. Method B allows a more accurate quantification of cell wall, required to understand and better explains the actual modification of the cell wall. The suitability of both methods, therefore, depends on their intended purposes.

Nutrition and health from dairy calf to heifer : International Dairy Nutrition Symposium Proceedings
Duinkerken, G. van; Hendriks, W.H. - \ 2019
Wageningen : Wageningen University & Research - 83 p.
Bioavailability of α-tocopherol stereoisomers in lambs depends on dietary doses of all-rac- or RRR-α-tocopheryl acetate
Neto Leal, Leonel ; Jensen, S.K. ; Bello, J.M. ; Hartog, L.A. den; Hendriks, W.H. ; Martín-Tereso, Javier - \ 2019
Animal 13 (2019)9. - ISSN 1751-7311 - p. 1874 - 1882.
When supplementing lamb diets with vitamin E, an equivalence factor of 1.36 is used to discriminate between RRR-α-tocopheryl acetate and all-rac-α tocopheryl acetate. However, more recent studies suggest a need for new equivalence factors for livestock animals. The current study aimed to determine the effect of RRR- and all-rac-α-tocopheryl acetate supplementation on α-tocopherol deposition in lamb tissues. A total of 108 Rasa Aragonesa breed lambs were fed increasing amounts of all-rac-α-tocopheryl acetate (0.25, 0.5, 1.0 and 2.0 g/kg compound feed) or RRR-α-tocopheryl acetate (0.125, 0.25, 0.5 and 1.0 g/kg compound feed) by adding them to a basal diet that contained 0.025 g/kg feed of all-rac-α-tocopheryl acetate as part of the standard vitamin and mineral mixture. The diets were fed for the last 14 days before slaughtering at 25.8 ± 1.67 kg BW. Within 20 min after slaughter samples of muscle, heart, liver, brain and spleen were frozen at −20°C until α-tocopherol analysis. Increased supplementation of either vitamin E sources led to a significant increase ( P<0.001) in α-tocopherol concentration in all tissues studied. The tissue with the highest α-tocopherol concentration was the liver followed by spleen, heart and muscle. At similar supplementation levels (0.25, 0.50 and 1.0 g/kg compound feed), α-tocopherol content in the selected tissues was not affected by α-tocopherol source. However, the ratios between RRR- and all-rac α-tocopheryl acetate increased with the increasing α-tocopherol supplementation (at 0.25 and 1.0 g/kg compound feed), from 1.06 to 1.16 in muscle, 1.07 to 1.15 in heart, 0.91 to 0.94 in liver and 0.98 to 1.10 in spleen. The highest relative proportion of Ʃ2S (sum of SSS-, SSR-, SRS- and SRR-α tocopherol)-configured stereoisomers was found in the liver of lambs supplemented with all-rac-α-tocopheryl acetate accounting for up to 35 to 39% of the total α-tocopherol retained, whereas the proportion of Ʃ2S-configured stereoisomers in the other tissues accounted for <14%. Increasing all-rac-α-tocopheryl acetate supplementation was also found to affect the 2R-configured stereoisomer profile in muscle, heart and spleen with increasing proportions of RRS-, RSR- and RSS- at the cost of RRR-α-tocopherol. In all tissues, the relative proportion of all non-RRR-stereoisomers in lambs receiving RRR-α-tocopheryl acetate was lower than RRR-α-tocopherol. These results confirm that the relative bioavailability of RRR- and all-rac-α-tocopheryl acetate is dose- and tissue-dependent and that a single ratio to discriminate the two sources cannot be used.
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