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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Modulation of sensory perception of cheese attributes intensity and texture liking via ortho- and retro-nasal odors
Han, Pengfei ; Fark, Therese ; Wijk, Rene A. de; Roudnitzky, Natacha ; Iannilli, Emilia ; Seo, Han Seok ; Hummel, Thomas - \ 2019
Food Quality and Preference 73 (2019). - ISSN 0950-3293 - p. 1 - 7.
Cheese - Congruency - Cross-modal sensory enhancement - Orthonasal - Retronasal - Texture

Cross-modal sensory integration plays a key role in food flavor perception and acceptance during consumption. The current study investigated the effect of a butter odor, delivered at various stages of the oral processing cycle, on modulating the sensory properties of cheese. Twenty healthy volunteers (aged between 25 and 29 years, 12 women) were measured for their detection thresholds for the butter odor. In the sensory evaluation sessions, participants chewed and swallowed three types of cheese (low-fat, 20% fat content, LF; a medium-fat, 30% fat content, MF; high-fat, 40% fat content, HF, served in 16 × 16 × 12 mm3 cubes) while the butter odor was presented ortho- and retronasally in two concentrations at various points of the oral processing cycle. After swallowing, participants rated on a visual analogue scale for the intensities of cheese creaminess, butter note, overall flavor, and the pleasantness for cheese texture. Enhancement of added butter odor on perceived sensory attributes differed as a function of the delivery routes and timings. Creaminess intensity increased significantly when butter odor presented retro-nasally at the start of chewing. Butter note was enhanced when the retro-nasal odor was added during chewing. The texture pleasantness was increased with ortho-nasal odor presentation. In addition, for the creaminess intensity and texture liking enhancement, the observed effects were more pronounced with butter odor presentation at the lower concentration. Taken together, these findings suggested the importance of temporal congruency for cross-modal sensory enhancement in food flavor perception. The findings help to better understand flavor perception during oral processing of solid food and add value for future development of foods with nutritional benefits.

Discovery of Sabellaria spinulosa reefs in an intensively fished area of the Dutch Continental Shelf, North Sea
Reijden, Karin J. Van Der; Koop, Leo ; O'flynn, Sarah ; Garcia, Silvia ; Bos, Oscar ; Sluis, Christiaan Van; Maaholm, David J. ; Herman, Peter M.J. ; Simons, Dick G. ; Olff, Han ; Ysebaert, Tom ; Snellen, Mirjam ; Govers, Laura L. ; Rijnsdorp, Adriaan D. ; Aguilar, Ricardo - \ 2019
Journal of Sea Research 144 (2019). - ISSN 1385-1101 - p. 85 - 94.
Biogenic Reef - Brown Bank - Ecosystem Engineer - Sabellaria spinulosa - North Sea
The tube-building polychaete Sabellaria spinulosa (Ross worm) can form conspicuous biogenic reefs that stabilize the seabed and increase biodiversity by providing a habitat for a multitude of other species. These reefs, however, are assumed to be vulnerable to human-induced physical disturbances of the seabed. In the Greater North Sea, S. spinulosa reefs are recognized to be under threat and worthy of protection. In August 2017, three S. spinulosa reefs with a minimum extent of 1016m2 were discovered in the Dutch Brown Bank area. This area comprises a large-scale sandbank and adjacent troughs. The reefs were found within the sandbank troughs, which have proven to be subject to high demersal fishing intensities (fished>5 times a year). Detailed bathymetry measurements showed that S. spinulosa reefs were mainly located within valleys of smaller-scaled sand waves, which have a perpendicular orientation compared to the large-scale sandbank structure of the Brown Bank. We hypothesize that the valleys in between sand waves offer suitable substrate for settlement and refuge from abrasion by fishing activities, enabling the S. spinulosa reefs to persist despite high fishing intensities. ROV footage of the reefs showed higher estimates of species abundances on the reefs compared with adjacent habitats, with some species present that are typical for hard substrate (rock gunnel, Pholis gunnellus; edible crab, Cancer pagurus; and velvet swimming crab, Necora puber). The information presented could be used for drafting management policies to protect these reefs, as Contracting Parties of the OSPAR Convention are committed to take measures and protect biodiversity.
La Guía de las MSP : cómo diseñar y facilitar asociaciones de múltiples partes interesadas
Brouwer, J.H. ; Woodhill, A.J. ; Hemmati, Minu ; Verhoosel, K.S. ; Vugt, S.M. van - \ 2018
Wageningen : Wageningen Centre for Development Innovation - ISBN 9781788530293 - 183 p.
En los últimos años, las asociaciones de múltiples partes interesadas (MSP, por sus siglas en Inglés) se han vuelto populares por enfrentar los complejos desafíos del desarrollo sostenible. Esta guía proporciona un marco práctico para el diseño y la facilitación de estos procesos de colaboración que funcionan más allá de los límites de las empresas, el gobierno, la sociedad civil y la ciencia. La guía vincula los fundamentos subyacentes de las asociaciones de múltiples partes interesadas, con un modelo de proceso de cuatro fases claro, un conjunto de siete principios básicos, ideas clave para la facilitación y 60 herramientas participativas para el análisis, la planificación y la toma de decisiones.
La Guía se ha escrito para aquellos directamente involucrados en las MSP, como parte interesada, líder, facilitador o financiador, para proporcionar los fundamentos conceptuales y las herramientas prácticas que sustentan las alianzas exitosas.
Lo que hay en la Guía se basa en la experiencia directa del personal del Wageningen Centro de Innovación para el Desarrollo (WCDI) de la Universidad de Wageningen, en el apoyo de procesos de MSP en muchos países alrededor del mundo. La guía también compila las ideas y materiales detrás del curso internacional anual de CDI de tres semanas para facilitar las MSP y el aprendizaje social.
Este trabajo ha sido inspirado por la motivación y la pasión que surge cuando las personas se atreven a “caminar en los zapatos del otro” para encontrar nuevos caminos hacia ambiciones compartidas para el futuro.
Nucleic Acids Nanoscience at Interfaces Special Issue
Zuilhof, Han ; Albada, Bauke ; Armitage, Bruce ; Howorka, Stefan - \ 2018
Langmuir 34 (2018)49. - ISSN 0743-7463 - p. 14691 - 14691.
One-Step Generation of Reactive Superhydrophobic Surfaces via SiHCl3-Based Silicone Nanofilaments
Slagman, Sjoerd ; Pujari, Sidharam P. ; Franssen, Maurice C.R. ; Zuilhof, Han - \ 2018
Langmuir 34 (2018)45. - ISSN 0743-7463 - p. 13505 - 13513.

Superhydrophobic surfaces gain ever-growing attention because of their applicability in many (consumer) products/materials as they often display, among others, antifouling, anti-icing, and/or self-cleaning properties. A simple way to achieve superhydrophobicity is through the growth of silicone nanofilaments. These nanofilaments, however, are very often nonreactive and thus difficult to utilize in subsequent chemistries. In response, we have developed a single-step procedure to grow (SiHCl3-based) silicone nanofilaments with selective reactivity that are intrinsically superhydrophobic. The silicone nanofilaments could be further functionalized via Pt-catalyzed hydrosilylation of exposed Si-H moieties. These surfaces are easily obtained using mild conditions and are stable under hydrolytic conditions (neutral water, 24 h at 80 °C) while remaining highly transparent, which makes them well suited for optical and photochemical experiments.

Dual water-healable zwitterionic polymer coatings for anti-biofouling surfaces
Wang, Zhanhua ; Fei, Guoxia ; Xia, Hesheng ; Zuilhof, Han - \ 2018
Journal of materials chemistry. B, Materials for biology and medicine 6 (2018)43. - ISSN 2050-7518 - p. 6930 - 6935.

Herein, we show for the first time drop-casting zwitterionic polymer colloidal particles onto different surfaces to obtain zwitterionic coatings with highly protein-repelling properties and dual self-healing capabilities. Upon nano/micro mechanical scratches, the coatings self-heal in a NaCl solution which is accompanied by the recovery of the anti-biofouling characteristics. Also under severe macro damage conditions, water will induce the zwitterionic groups buried inside the particles to transfer to the coating surface, and as such regenerate the surface-wetting properties and repair the anti-biofouling properties.

Identification and expression analysis of the Spodoptera exigua neuropeptidome under different physiological conditions
Llopis-Giménez, A. ; Han, Y. ; Kim, Y. ; Ros, V.I.D. ; Herrero, S. - \ 2018
Insect Molecular Biology (2018). - ISSN 0962-1075
lepidopteran - neuropeptides - physiology - RNAseq - Spodoptera

Neuropeptides are small signalling molecules acting as neurohormones, neurotransmitters and neuromodulators. Being part of the chemical communication system between cells within an organism, they are involved in the regulation of different aspects of animal physiology and behaviour such as feeding, reproduction, development and locomotion. Transcriptomic data from larval and adult tissues have been obtained and mined to generate a comprehensive neuropeptidome for the polyphagous insect pest Spodoptera exigua. Sixty-three neuropeptides have been identified and described based on their tissue specificity and their regulation in response to different abiotic perturbations. Expression analyses have identified those neuropeptides involved in ingestive and digestive behaviour of S. exigua larvae and revealed a general pattern of upregulation in the midgut during larval starvation. Our results represent a comprehensive neuropeptidome of a lepidopteran species that will be highly relevant to future studies and provide novel information of the insect’s perception of its environment.

Life in de polar oceans : the role of sea ice in the biology and ecology of marine species
Schaafsma, Fokje Lieuwkje - \ 2018
Wageningen University. Promotor(en): Han Lindeboom, co-promotor(en): Jan Andries van Franeker. - Wageningen : Wageningen University - ISBN 9789463433549 - 227
Romantic surfaces : Zwitterionic polymer brushes for biomedical applications
Andel, Esther van - \ 2018
Wageningen University. Promotor(en): Han Zuilhof; Huub Savelkoul, co-promotor(en): Maarten Smulders; Edwin Tijhaar. - Wageningen : Wageningen University - ISBN 9789463435154 - 253
City Deal; Voedsel op de stedelijke agenda. 5 Acteis om voedsel op de stedelijke agenda te zetten
Wiskerke, Han - \ 2018
Wil je als stad duurzamer worden, dan zul je ook voedsel in je beleid moeten meenemen
Mild oxidation and functionalisation of synthetic polymer surfaces
Slagman, Sjoerd - \ 2018
Wageningen University. Promotor(en): Han Zuilhof, co-promotor(en): Maurice Franssen. - Wageningen : Wageningen University - ISBN 9789463435116 - 163
Harnessing longitudinal information to identify genetic variation in tolerance of pigs to Porcine Reproductive and Respiratory Syndrome virus infection
Lough, Graham ; Hess, Andrew ; Hess, Melanie ; Rashidi, Hamed ; Matika, Oswald ; Lunney, Joan K. ; Rowland, Raymond R.R. ; Kyriazakis, Ilias ; Mulder, Han A. ; Dekkers, Jack C.M. ; Doeschl-Wilson, Andrea - \ 2018
Genetics, Selection, Evolution 50 (2018). - ISSN 0999-193X

Background: High resistance (the ability of the host to reduce pathogen load) and tolerance (the ability to maintain high performance at a given pathogen load) are two desirable host traits for producing animals that are resilient to infections. For Porcine Reproductive and Respiratory Syndrome (PRRS), one of the most devastating swine diseases worldwide, studies have identified substantial genetic variation in resistance of pigs, but evidence for genetic variation in tolerance has so far been inconclusive. Resistance and tolerance are usually considered as static traits. In this study, we used longitudinal viremia measurements of PRRS virus infected pigs to define discrete stages of infection based on viremia profile characteristics. These were used to investigate host genetic effects on viral load (VL) and growth at different stages of infection, to quantify genetic variation in tolerance at these stages and throughout the entire 42-day observation period, and to assess whether the single nucleotide polymorphism (SNP) WUR10000125 (WUR) with known large effects on resistance confers significant differences in tolerance. Results: Genetic correlations between resistance and growth changed considerably over time. Individuals that expressed high genetic resistance early in infection tended to grow slower during that time-period, but were more likely to experience lower VL and recovery in growth by the later stage. The WUR genotype was most strongly associated with VL at early- to mid-stages of infection, and with growth at mid- to late-stages of infection. Both, single-stage and repeated measurements random regression models identified significant genetic variation in tolerance. The WUR SNP was significantly associated only with the overall tolerance slope fitted through all stages of infection, with the genetically more resistant AB pigs for the WUR SNP being also more tolerant to PRRS. Conclusions: The results suggest that genetic selection for improved tolerance of pigs to PRRS is possible in principle, but may be feasible only with genomic selection, requiring intense recording schemes that involve repeated measurements to reliably estimate genetic effects. In the absence of such records, consideration of the WUR genotype in current selection schemes appears to be a promising strategy to improve simultaneously resistance and tolerance of growing pigs to PRRS.

Over de samenhang tussen voedselvoorziening en stedelijke ontwikkeling
Wiskerke, Han - \ 2018
Voedsel, stad en gezondheid: uitdagingen en aanknopingspunten voor verandering
Wiskerke, Han - \ 2018
Pilot 5G Fieldlab van start in Valthermond
Booij, Johan ; Hoekzema, Gerard ; Veldhuisen, Bram - \ 2018
Agricultural pastures challenge the attractiveness of natural saltmarsh for a migratory goose
Dokter, Adriaan M. ; Fokkema, Wimke ; Ebbinge, Barwolt S. ; Olff, Han ; Jeugd, Henk P. van der; Nolet, Bart A. - \ 2018
Journal of Applied Ecology 55 (2018)6. - ISSN 0021-8901 - p. 2707 - 2718.
accelerometer - brent geese - GPS tracking - habitat switching - human–goose conflict - migration - pastures - saltmarsh

Broad-scale land conversions and fertilizer use have dramatically altered the available staging area for herbivorous long-distance migrants. Instead of natural land, these birds rely increasingly on pastures for migratory fuelling and stopover, often conflicting with farming practices. To predict and manage birds’ future habitat use, the relative advantages and disadvantages of natural (e.g. saltmarsh, intertidal) versus anthropogenic staging sites for foraging need to be understood. We compared the migratory staging of brent geese on saltmarsh and pasture sites in spring. Food quality (nitrogen and fibre content), antagonistic behaviour, and body weight were quantified at nearby sites in simultaneous seasons. Individuals were tracked with high-resolution GPS and accelerometers to compare timing of migration and time budgets during fuelling. On pastures, birds rested more and experienced higher ingestion rates, similar or superior food quality and reduced antagonistic interactions than on saltmarsh. Brent geese using fertilized grasslands advanced their fuelling and migration schedules compared to those using saltmarsh. Pasture birds reached heavy weights earlier, departed sooner, and arrived in the Arctic earlier. Intertidal mudflats were frequently visited by saltmarsh birds during the day, and available food there (algae, some seagrass) was of higher quality than terrestrial resources. Availability of intertidal resources was an important factor balancing the otherwise more favourable conditions on pastures relative to saltmarsh. Synthesis and applications. Disadvantages of longer foraging effort, more antagonistic interactions and delayed fuelling schedules on traditional saltmarshes may cause geese to exchange this traditional niche in favour of pastures, especially in a warming climate that requires advancement of migratory schedules. However, due to its high quality, intertidal forage can complement terrestrial foraging, potentially removing the incentive for habitat switches to pastures. The relatively high quality of green algae and seagrass, and birds’ remarkable preference for these resources when available, provides a key for managers to create landscapes that can sustain this specialist’s intertidal lifestyle. To keep natural habitats attractive to staging geese with the purpose of preventing conflicts with farming practices, management actions should focus on conservation and restoration of saltmarsh and especially intertidal habitat.

Systematic Comparison of Zwitterionic and Non-Zwitterionic Antifouling Polymer Brushes on a Bead-Based Platform
Andel, Esther van; Lange, Stefanie C. ; Pujari, Sidharam P. ; Tijhaar, Edwin J. ; Smulders, Maarten M.J. ; Savelkoul, Huub F.J. ; Zuilhof, Han - \ 2018
Langmuir (2018). - ISSN 0743-7463 - 11 p.

Nonspecific adsorption of biomolecules to solid surfaces, a process called biofouling, is a major concern in many biomedical applications. Great effort has been made in the development of antifouling polymer coatings that are capable of repelling the nonspecific adsorption of proteins, cells, and micro-organisms. In this respect, we herein contribute to understanding the factors that determine which polymer brush results in the best antifouling coating. To this end, we compared five different monomers: two sulfobetaines, a carboxybetaine, a phosphocholine, and a hydroxyl acrylamide. The antifouling coatings were analyzed using our previously described bead-based method with flow cytometry as the read-out system. This method allows for the quick and automated analysis of thousands of beads per second, enabling fast analysis and good statistics. We report the first direct comparison made between a sulfobetaine with opposite charges separated by two and three methylene groups and a carboxybetaine bearing two separating methylene groups. It was concluded that both the distance between opposite charges and the nature of the anionic groups have a distinct effect on the antifouling performance. Phosphocholines and simple hydroxyl acrylamides are not often compared with the betaines. However, here we found that they perform equally well or even better, yielding the following overall antifouling ranking: HPMAA ≥ PCMA-2 ≈ CBMAA-2 > SBMAA-2 > SBMAA-3 ≫ nonmodified beads (HPMAA being the best).

Proeftuin combineert 'al het beste'
Rijk, Joost - \ 2018
High electrical conductivity and high porosity in a Guest@MOF material : Evidence of TCNQ ordering within Cu3BTC2 micropores
Schneider, Christian ; Ukaj, Dardan ; Koerver, Raimund ; Talin, A.A. ; Kieslich, Gregor ; Pujari, Sidharam P. ; Zuilhof, Han ; Janek, Jürgen ; Allendorf, Mark D. ; Fischer, Roland A. - \ 2018
Chemical Science 9 (2018)37. - ISSN 2041-6520 - p. 7405 - 7412.

The host-guest system TCNQ@Cu3BTC2 (TCNQ = 7,7,8,8-tetracyanoquinodimethane, BTC = 1,3,5-benzenetricarboxylate) is a striking example of how semiconductivity can be introduced by guest incorporation in an otherwise insulating parent material. Exhibiting both microporosity and semiconducting behavior such materials offer exciting opportunities as next-generation sensor materials. Here, we apply a solvent-free vapor phase loading under rigorous exclusion of moisture, obtaining a series of the general formula xTCNQ@Cu3BTC2 (0 ≤ x ≤ 1.0). By using powder X-ray diffraction, infrared and X-ray absorption spectroscopy together with scanning electron microscopy and porosimetry, we provide the first structural evidence for a systematic preferential arrangement of TCNQ along the (111) lattice plane and the bridging coordination motif to two neighbouring Cu-paddlewheels, as was predicted by theory. For 1.0TCNQ@Cu3BTC2 we find a specific electrical conductivity of up to 1.5 × 10-4 S cm-1 whilst maintaining a high BET surface area of 573.7 m2 g-1. These values are unmatched by MOFs with equally high electrical conductivity, making the material attractive for applications such as super capacitors and chemiresistors. Our results represent the crucial missing link needed to firmly establish the structure-property relationship revealed in TCNQ@Cu3BTC2, thereby creating a sound basis for using this as a design principle for electrically conducting MOFs.

Bioassays to Quantify Hygienic Behavior in Honey Bee (Apis Mellifera L.) Colonies : A Review
Leclercq, Gil ; Francis, Frédéric ; Gengler, Nicolas ; Blacquière, Tjeerd - \ 2018
Journal of Apicultural Research 57 (2018). - ISSN 0021-8839 - p. 663 - 673.
Apis mellifera - Ascosphaera apis - bioassays - hygienic behavior - Paenibacillus larvae - Varroa destructor

Individual immunity in honey bees (Apis mellifera L.) is complemented by highly evolved social behaviors. Among them, hygienic behavior has a key role involving the detection and removal of unhealthy or dead brood. Since the 1960s, several bioassays have been developed to quantify the hygienic behavior of honey bee colonies against chalkbrood, American foulbrood, and varroa infested brood. Here, we review the five main bioassays used since the late 1960s. We describe their advantages and disadvantages, including a special focus on their inherent biases. For each assay, we also discuss whether or not their use should be restricted to quantify the hygienic behavior against chalkbrood, or American foulbrood, or varroa infested brood. Overall, the bioassays involving the removal of freeze-killed brood are recommended over the bioassays relying on the removal of pin-killed brood but only for the quantification of hygienic behavior toward chalkbrood and American foulbrood. These bioassays are not recommended to quantify the hygienic behavior toward varroa infested brood, for which an accurate assessment should rely on assays based on the removal of brood artificially infested with varroa mites. Choosing an appropriate bioassay is crucial for an accurate assessment of the hygienic behavior against a defined pathogen, depending on the research question, or the goal of the breeding program. Bioensayos para cuantificar el comportamiento higiénico en las colonias de abejas melíferas (Apis mellifera L.): una revisión La inmunidad individual de las abejas melíferas (Apis mellifera L.) se complementa con comportamientos sociales altamente evolucionados. Entre ellos, el comportamiento higiénico tiene un papel clave en la detección y eliminación de crías enfermas o muertas. Desde la década de 1960, se han desarrollado varios bioensayos para cuantificar el comportamiento higiénico de las colonias de abejas melíferas frente a la cría infestada de Ascosfera, loque americana y varroa. Aquí revisamos los cinco principales bioensayos utilizados desde finales de la década de 1960. Describimos sus ventajas y desventajas, incluyendo un enfoque especial en sus sesgos inherentes. Para cada ensayo, también discutimos si su uso debe ser restringido o no para cuantificar el comportamiento higiénico contra la cría de loque americana o la cría infestada de varroa. En general, los bioensayos que involucran la eliminación de la cría muerta por congelación son más recomendables que los bioensayos que dependen de la eliminación de la cría muerta por pin, pero sólo para la cuantificación del comportamiento higiénico hacia la cría infestada de Ascosfera y la loque americana. Estos bioensayos no se recomiendan para cuantificar el comportamiento higiénico de la cría infestada de varroa, para lo cual una evaluación precisa debe basarse en ensayos basados en la extracción de la cría infestada artificialmente con ácaros de la varroa. La elección de un bioensayo apropiado es crucial para una evaluación precisa del comportamiento higiénico frente a un patógeno definido, dependiendo de la pregunta de investigación o del objetivo del programa de cría.

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