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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Postharvest Technology in Tomatoes
Westra, Eelke - \ 2018
postharvest - tomatoes - quality - colour - taste - prediction - vegetables - transport - logistics - postharvest - tomatoes - quality - taste - colour - prediction - vegetables - transport - logistics
Adding value to end of lay hens: improving welfare, sustainability and credibility
Weeks, C.A. ; Elson, H.A. ; Jozefova, J. ; Neijenhuis, F. ; Yngvesson, J. ; Voslarova, E. - \ 2017
In: Book of Abstracts Xth Symposium on Poultry Welfare. - World's Poultry Science Association (WPSA) - p. 167 - 168.
Hens - transport - handling - networking - end of lay - welfare
Assessing the case for sequential cropping to produce low ILUC risk biomethane : final report
Peters, Daan ; Zabeti, Masoud ; Kühner, Ann-Kathri ; Spöttle, Matthias ; Werf, Wopke van der; Stomph, Jan - \ 2016
Utrecht : ECOFYS Netherlands - 39
methane - biofuels - sequential cropping - farmers' associations - biogas - ancillary enterprises - farm management - agricultural energy production - transport - biobased economy - fuel crops - biomass production - methaan - biobrandstoffen - estafetteteelt - boerenorganisaties - nevenactiviteiten - agrarische bedrijfsvoering - energieproductie in de landbouw - brandstofgewassen - biomassa productie
In recent years and especially since the COP - 21 climate agreement reached in Paris last year, efforts to mitigate climate change accelerate. All sectors need to contribute in order to achieve the well below 2 degree climate target. The agricultural sector is relevant for climate change in various ways. Like the agricultural sector, the transport sector is also responsible for significant greenhouse gas emissions. Advanced biofuels and biogas produced from wastes and residues can play an increasingly important role in the transport mix. In Italy, 600 Italian farmers are organised in the Italian Biogas Council (Consorzio Italiano Biogas e Gassificazione, CIB). Some years ago, CIB members developed a concept that they coined Biogasdoneright. In collaboration with various research institutes they seeked for a way to combine biogas feedstock production with crop production for food and feed as a way to generate additional income in a sustainable manner. The core of the Biogasdoneright concept is that farmers apply sequential cropping by growing a winter cover crop on land that was previously fallow during winter time, while maintaining the main crop production during summer time as previously. Multiple claims can be made about Biogasdoneright, for example related to the large potential role for biogas in our future energy system. This project focussed on the most relevant claims related to the use of biomethane in transport, with a focus on sustainability aspects.
Monitoring van het helingsproces van de navelstrengen van geitenlammeren
Verkaik, Jan ; Dixhoorn, Ingrid van; Gunnink, Henk ; Hattum, Theo van; Ouweltjes, Wijbrand - \ 2016
Wageningen : Wageningen Livestock Research (Livestock Research rapport 992) - 21
dierenwelzijn - dierlijke productie - geiten - diergezondheid - transport - animal welfare - animal production - goats - animal health
Spoor naar China wacht op exporteurs
Zhang, Xiaoyong - \ 2016
long distance transport - transport - exports - agricultural products - china - rail transport - logistics

Zonde, al die treinen die vanuit Europa halfleeg terugkeren naar China, dacht Xiaoyong Zhang van Wageningen UR. China vormt namelijk een grote afzetmarkt voor Nederlandse zuivelproducten, groente, fruit en bloemen. Vervoer over de Nieuwe Zijderoute is sneller dan over zee en goedkoper dan door de lucht.

National Agrologistics Program : report 2: Diagnosis
Ravensbergen, P. ; Langelaan, H.C. - \ 2015
Wageningen UR - Food & Biobased Research - 64 p.
logistics - agroindustrial sector - infrastructure - transport - cold storage - supply chain management - mexico - logistiek - agro-industriële sector - infrastructuur - koudeopslag - ketenmanagement
Programa Nacional de Agrologística : informe 2: Diagnóstico
Ravensbergen, P. ; Langelaan, H.C. - \ 2015
Wageningen UR - Food & Biobased Research - 64 p.
logistics - agroindustrial sector - infrastructure - transport - cold storage - supply chain management - mexico - logistiek - agro-industriële sector - infrastructuur - koudeopslag - ketenmanagement
Agrofood-trein naar China
Guiking, K. ; Zhang XiaoYong, Xiaoyong - \ 2015
Resource: weekblad voor Wageningen UR 10 (2015)6. - ISSN 1874-3625 - p. 4 - 4.
china - voedingsmiddelen - bloemen - transport - railtransport - agro-industriële sector - nederland - foods - flowers - rail transport - agroindustrial sector - netherlands
Transport van voedingsmiddelen en bloemen van Nederland naar China kan goed via het spoor, zegt LEI-onderzoeker Xiaoyong Zhang. Ze presenteerde haar bevindingen op 28 oktober aan een handelsdelegatie in China, met toehoorders als de Rotterdamse burgemeester Ahmed Aboutaleb en koning Willem-Alexander.
Reporters for sensitive and quantitative measurement of auxin response
Liao, C.Y. ; Smet, W.M.S. ; Brunoud, G. ; Yoshida, S. ; Vernoux, T. ; Weijers, D. - \ 2015
Nature Methods : techniques for life scientists and chemists 12 (2015). - ISSN 1548-7091 - p. 207 - 210.
apical-basal axis - box protein tir1 - aux/iaa proteins - arabidopsis - transcription - expression - transport - specificity - sufficient - perception
The visualization of hormonal signaling input and output is key to understanding how multicellular development is regulated. The plant signaling molecule auxin triggers many growth and developmental responses, but current tools lack the sensitivity or precision to visualize these. We developed a set of fluorescent reporters that allow sensitive and semiquantitative readout of auxin responses at cellular resolution in Arabidopsis thaliana. These generic tools are suitable for any transformable plant species.
Front spreading with nonlinear sorption for oscillating flow
Cirkel, D.G. ; Zee, S.E.A.T.M. van der; Meeussen, J.C.L. - \ 2015
Water Resources Research 51 (2015)4. - ISSN 0043-1397 - p. 2986 - 2993.
thermal-energy storage - porous mediums - transport - groundwater - solute - propagation
In this paper, we consider dispersive and chromatographic mixing at an interface, under alternating flow conditions. In case of a nonreactive or linearly sorbing solute, mixing is in complete analogy with classical dispersion theory. For nonlinear exchange, however, oscillating convective flow leads to an alternation of sharpening (Traveling Wave TW) and spreading (Rarefaction Wave RW). As the limiting TW form is not necessarily accomplished at the end of the TW half cycle, the oscillating fronts show gradual continuous spreading that converges to a zero-convection nonlinear pure diffusion spreading, which is mathematically of quite different nature. This behavior is maintained in case the total (background) concentration differs at both sides of the initial exchange front.
Sugar as a key component of the shoot branching regulation network
Evers, J.B. - \ 2015
Plant, Cell & Environment 38 (2015)8. - ISSN 0140-7791 - p. 1455 - 1456.
red ratio - auxin - transport - wheat
Commentary on kebrom and mullet ‘photosynthetic leaf area modulates tiller bud outgrowth in sorghum’
Exergetic comparison of food waste valorization in industrial bread production
Zisopoulos, F.K. ; Moejes, S.N. ; Rossier Miranda, F.J. ; Goot, A.J. van der; Boom, R.M. - \ 2015
Energy 82 (2015). - ISSN 0360-5442 - p. 640 - 649.
sustainability assessment - energy - consumption - transport - dryer
This study compares the thermodynamic performance of three industrial bread production chains: one that generates food waste, one that avoids food waste generation, and one that reworks food waste to produce new bread. The chemical exergy flows were found to be much larger than the physical exergy consumed in all the industrial bread chains studied. The par-baked brown bun production chain had the best thermodynamic performance because of the highest rational exergetic efficiency (71.2%), the lowest specific exergy losses (5.4 MJ/kg brown bun), and the almost lowest cumulative exergy losses (4768 MJ/1000 kg of dough processed). However, recycling of bread waste is also exergetically efficient when the total fermented surplus is utilizable. Clearly, preventing material losses (i.e. utilizing raw materials maximally) improves the exergetic efficiency of industrial bread chains. In addition, most of the physical (non-material related) exergy losses occurred at the baking, cooling and freezing steps. Consequently, any additional improvement in industrial bread production should focus on the design of thermodynamically efficient baking and cooling processes, and on the use of technologies throughout the chain that consume the lowest possible physical exergy.
A Quantitative and Dynamic Model of the Arabidopsis Flowering Time Gene Regulatory Network
Valentim, F.L. ; Mourik, S. van; Posé, D. ; Kim, M.C. ; Schmid, M. ; Ham, R.C.H.J. van; Busscher, M. ; Sanchez Perez, G.F. ; Molenaar, J. ; Angenent, G.C. ; Immink, R.G.H. ; Dijk, A.D.J. van - \ 2015
PLoS One 10 (2015)2. - ISSN 1932-6203
floral transition - feedback loops - ft protein - expression - induction - transport - thaliana - signals - leafy - soc1
Various environmental signals integrate into a network of floral regulatory genes leading to the final decision on when to flower. Although a wealth of qualitative knowledge is available on how flowering time genes regulate each other, only a few studies incorporated this knowledge into predictive models. Such models are invaluable as they enable to investigate how various types of inputs are combined to give a quantitative readout. To investigate the effect of gene expression disturbances on flowering time, we developed a dynamic model for the regulation of flowering time in Arabidopsis thaliana. Model parameters were estimated based on expression time-courses for relevant genes, and a consistent set of flowering times for plants of various genetic backgrounds. Validation was performed by predicting changes in expression level in mutant backgrounds and comparing these predictions with independent expression data, and by comparison of predicted and experimental flowering times for several double mutants. Remarkably, the model predicts that a disturbance in a particular gene has not necessarily the largest impact on directly connected genes. For example, the model predicts that SUPPRESSOR OF OVEREXPRESSION OF CONSTANS (SOC1) mutation has a larger impact on APETALA1 (AP1), which is not directly regulated by SOC1, compared to its effect on LEAFY (LFY) which is under direct control of SOC1. This was confirmed by expression data. Another model prediction involves the importance of cooperativity in the regulation of APETALA1 (AP1) by LFY, a prediction supported by experimental evidence. Concluding, our model for flowering time gene regulation enables to address how different quantitative inputs are combined into one quantitative output, flowering time.
Diffusible crosslinkers generate directed forces in microtubule networks
Lansky, Z. ; Braun, M. ; Diez, S. ; Janson, M.E. - \ 2015
Cell 160 (2015)6. - ISSN 0092-8674 - p. 1159 - 1168.
fission yeast - overlapping microtubules - kinesin motors - cell-division - protein - ase1p - friction - complex - cytokinesis - transport
Cytoskeletal remodeling is essential to eukaryotic cell division and morphogenesis. The mechanical forces driving the restructuring are attributed to the action of molecular motors and the dynamics of cytoskeletal filaments, which both consume chemical energy. By contrast, non-enzymatic filament crosslinkers are regarded as mere friction-generating entities. Here, we experimentally demonstrate that diffusible microtubule crosslinkers of the Ase1/PRC1/Map65 family generate directed microtubule sliding when confined between partially overlapping microtubules. The Ase1-generated forces, directly measured by optical tweezers to be in the piconewton-range, were sufficient to antagonize motor-protein driven microtubule sliding. Force generation is quantitatively explained by the entropic expansion of confined Ase1 molecules diffusing within the microtubule overlaps. The thermal motion of crosslinkers is thus harnessed to generate mechanical work analogous to compressed gas propelling a piston in a cylinder. As confinement of diffusible proteins is ubiquitous in cells, the associated entropic forces are likely of importance for cellular mechanics beyond cytoskeletal networks.
Plant embryogenesis requires AUX/LAX-mediated auxin influx
Robert, H.S. ; Grunewald, W. ; Cannoot, B. ; Soriano, M. ; Swarup, R. ; Weijers, D. ; Bennett, M. ; Boutilier, K.A. ; Friml, J. - \ 2015
Development 142 (2015). - ISSN 0950-1991 - p. 702 - 711.
arabidopsis root apex - apical-basal axis - tobacco cells - permease aux1 - gene activity - transport - embryo - monopteros - proteins - carrier
The plant hormone auxin and its directional transport are known to play a crucial role in defining the embryonic axis and subsequent development of the body plan. Although the role of PIN auxin efflux transporters has been clearly assigned during embryonic shoot and root specification, the role of the auxin influx carriers AUX1 and LIKE-AUX1 (LAX) proteins is not well established. Here, we used chemical and genetic tools on Brassica napus microspore-derived embryos and Arabidopsis thaliana zygotic embryos, and demonstrate that AUX1, LAX1 and LAX2 are required for both shoot and root pole formation, in concert with PIN efflux carriers. Furthermore, we uncovered a positive-feedback loop betweenMONOPTEROS(ARF5)- dependent auxin signalling and auxin transport. ThisMONOPTEROSdependent transcriptional regulation of auxin influx (AUX1, LAX1 and LAX2) and auxin efflux (PIN1 and PIN4) carriers by MONOPTEROS helps to maintain proper auxin transport to the root tip. These results indicate that auxin-dependent cell specification during embryo development requires balanced auxin transport involving both influx and efflux mechanisms, and that this transport is maintained by a positive transcriptional feedback on auxin signalling.
Optimizing Flood and Sediment Management of Spate Irrigation In Aba'ala Plains
Gebrehiwot, K. ; Mehari Haile, A. ; Fraiture, C.M.S. de; Demissie Chulkalla, A. ; Embaye, T.G. - \ 2015
Water Resources Management 29 (2015)3. - ISSN 0920-4741 - p. 833 - 847.
The Aba’ala spate irrigation systems, traditional and modern, have experienced different set of floodwater and sediment management problems. Despite the dire need of alternative spate irrigation system layout, operational strategy and locally maintainable structures, efforts made to manage floodwater and control sedimentation had been structural. Hence, the study was conducted to evaluate the existing flood and sediment management practices and identify alternative options for optimum management of floods and sediments in Aba’ala plain. Primary data including discharge, sediments and river cross-sections were collected through direct field measurement. Interviews and focal group discussions were also employed to understand the operational and maintenance activities. Delft3D model was used to simulate flow and sedimentation under different scenarios. For the existing condition, the model showed high sediment deposition and low flood water abstraction. The floodwater diverted is 2.1 and 1.16 Mm3 from the traditional intake and 1.52 and 0.51 Mm3 from the modern intake at medium and low floods respectively which is far below the required 2.8 Mm3 of water. Under Scenario-II, the modern intake diversion capacity is improved to 5.38 and 2.36 Mm3 at medium and low floods. However, a water level decline of 15 cm is observed at the downstream traditional intake which could be a cause for conflict between upstream and downstream users. Under Scenario-III, the diversion capacity of the modern intake is increased to 6.23 and 2.67 Mm3 at medium and low floods respectively. Moreover, no decline in water level is shown at the downstream intake.
Optimization and spatial pattern of large-scale aquifer thermal energy storage
Sommer, W.T. ; Valstar, J. ; Leusbrock, I. ; Grotenhuis, J.T.C. ; Rijnaarts, H.H.M. - \ 2015
Applied energy 137 (2015). - ISSN 0306-2619 - p. 322 - 337.
source heat-pumps - geothermal systems - ground-water - transport - consumption - simulations - performance - buildings - solute
Aquifer thermal energy storage (ATES) is a cost-effective technology that enables the reduction of energy use and CO2 emissions associated with the heating and cooling of buildings by storage and recovery of large quantities of thermal energy in the subsurface. Reducing the distance between wells in large-scale application of ATES increases the total amount of energy that can be provided by ATES in a given area. However, due to thermal interference the performance of individual systems can decrease. In this study a novel method is presented that can be used to (a) determine the impact of thermal interference on the economic and environmental performance of ATES and (b) optimize well distances in large-scale applications. The method is demonstrated using the hydrogeological conditions of Amsterdam, Netherlands. Results for this case study show that it is cost-effective to allow a limited amount of thermal interference, such that 30–40% more energy can be provided in a given area compared to the case in which all negative thermal interference is avoided. Sensitivity analysis indicates that optimal well distance is moderately insensitive to changes in hydrogeological and economic conditions. Maximum economic benefit compared to conventional heating and cooling systems on the other hand is sensitive, especially to changes in the gas price and storage temperatures.
Fractioning electrodialysis: a current induced ion exchange process
Galama, A.H. ; Daubaras, G. ; Burheim, O.S. ; Rijnaarts, H. ; Post, J.W. - \ 2014
Electrochimica Acta 136 (2014). - ISSN 0013-4686 - p. 257 - 265.
divalent ions - seawater desalination - membrane - monovalent - diffusion - transport - charge - nanofiltration - permeability - polarization
In desalination often multi ionic compositions are encountered. A preferential removal of multivalent ions over monovalent ions can be of interest to prevent scaling in the desalination process. Recently, a novel fractionating electrodialysis stack is described by Zhang et al., 2012 (in Sep. purify. Technol. 88). In the present work a small modification to such a stack was made, to create a current induced ion exchange process, in which no longer desalination occurs. This was done by building a membrane stack in which monovalent-selective ion-exchange membranes and standard grade ion-exchange membranes, with similar charge sign (so either anion or cation exchange groups), were placed alternatingly between an anode and a cathode to form a membrane stack. A proof of principle of the fractioning electrodialysis technology is given. Ternary mixtures, with a divalent-monovalent ion ratio similar to seawater, were used as feed water. For a cation and an anion fractioning stack, maximum fractionations of divalent ions were obtained of approximately 90 and 60%. At higher applied current density, ions can be fractionated to a larger extent than at lower applied current density. For both stacks the water recovery was 50%. Coulombic efficiency of both processes decrease rapidly after the start of the experiment. This leads to relatively large volumetric energy consumptions. (C) 2014 Elsevier Ltd. All rights reserved.
Improved flow velocity estmates from oving-boat ADCO measurements
Vermeulen, B. ; Sassi, M.G. ; Hoitink, A.J.F. - \ 2014
Water Resources Research 50 (2014)5. - ISSN 0043-1397 - p. 4186 - 4196.
doppler current profiler - suspended sediment - turbulence measurements - acoustic measurement - river - discharge - transport - division - channel - vessel
Acoustic Doppler current profilers (ADCPs) are the current standard for flow measurements in large-scale open water systems. Existing techniques to process vessel-mounted ADCP data assume homogeneous or linearly changing flow between the acoustic beams. This assumption is likely to fail but is nevertheless widely applied. We introduce a new methodology that abandons the standard assumption of uniform flow in the area between the beams and evaluate the drawbacks of the standard approach. The proposed method strongly reduces the extent over which homogeneity is assumed. The method is applied to two field sites: a mildly curved bend near a junction featuring a typical bend flow and a sharply curved bend that features a more complex sheared flow. In both cases, differences are found between the proposed method and the conventional method. The proposed technique yields different results for secondary flow patterns compared with the conventional method. The velocity components estimated with the conventional method can differ over 0.2 m/s in regions of strong shear. We investigate the number of repeat transects necessary to isolate the mean flow velocity vector from the raw ADCP signal, discarding the influences of noise, positioning and projection errors, and turbulence. Results show that several repeat transects are necessary. The minimum number of repeat measurements needed for robust mean velocity estimates is reduced when applying the proposed method
Analysis of animal welfare risks from unloading until slaughter: red meat livestock species
Visser, E.K. ; Ouweltjes, W. ; Spoolder, H.A.M. - \ 2014
Wageningen : WUR Livestock Research - 48
animal welfare - animal production - dairy cattle - beef cattle - pigs - sheep - horses - animal health - transport - slaughter - dierenwelzijn - dierlijke productie - melkvee - vleesvee - varkens - schapen - paarden - diergezondheid - slacht
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