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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Oral processing behavior of drinkable, spoonable and chewable foods is primarily determined by rheological and mechanical food properties
Aguayo-Mendoza, Monica G. ; Ketel, Eva C. ; Linden, Erik van der; Forde, Ciarán G. ; Piqueras-Fiszman, Betina ; Stieger, Markus - \ 2019
Food Quality and Preference 71 (2019). - ISSN 0950-3293 - p. 87 - 95.
Bite size - Consumption time - Eating rate - Food consistency - Food oral processing - Liking

Food oral processing plays a key role in sensory perception, consumer acceptance and food intake. However, little is known about the influence of physical food properties on oral processing of different type of food products. The primary objective of this study was to determine the influence of rheological and mechanical properties of foods on oral processing behavior of liquid (drinkable), semi-solid (spoonable) and solid foods (chewable). The secondary objective was to quantify the influence of product liking, frequency of consumption and familiarity on oral processing behavior. Rheological and mechanical properties of 18 commercially available foods were quantified. Parameters describing oral processing behavior such as sip and bite size, consumption time, eating rate, number of swallows, number of chews, cycle duration, and chewing rate were extracted from video recordings of 61 consumers. Subjects evaluated products’ liking, familiarity, and frequency of consumption using questionnaires. Consumers strongly adapted oral processing behavior with respect to bite size, consumption time, and eating rate to the rheological and mechanical properties of liquid, semi-solid and solid foods. This adaptation was observed within each food category. Chewing rate and chewing cycle duration of solid foods were not influenced by mechanical properties and remained relatively constant. Liking, familiarity, and consumption frequency showed to impact oral processing behavior, although to a lower degree than the rheological and mechanical properties of food. We conclude that the oral processing behaviors of liquid, semi-solid and solid foods are mainly determined by their rheological and mechanical properties.

Zoeken naar de beste genen : ruim 100 jaar plantenveredeling
Linden, Gerard van der; Visser, Richard - \ 2018
Looking for the best genes : over 100 years of plant breeding
Linden, Gerard van der; Visser, Richard - \ 2018
LiGAPS-Beef, a mechanistic model to explore potential and feed-limited beef production 3: model evaluation
Linden, A. van der; Ven, G.W.J. van de; Oosting, S.J. ; Ittersum, M.K. van; Boer, I.J.M. de - \ 2018
Animal (2018). - ISSN 1751-7311 - 11 p.
LiGAPS-Beef (Livestock simulator for Generic analysis of Animal Production Systems – Beef cattle) is a generic, mechanistic model designed to quantify potential and feed-limited growth, which provides insight in the biophysical scope to increase beef production (i.e. yield gap). Furthermore, it enables identification of the bio-physical factors that define and limit growth, which provides insight in management strategies to mitigate yield gaps. The aim of this paper, third in a series of three, is to evaluate the performance of LiGAPS-Beef with independent experimental data. After model calibration, independent data were used from six experiments in Australia, one in Uruguay and one in the Netherlands. Experiments represented three cattle breeds, and a wide range of climates, feeding strategies and cattle growth rates. The mean difference between simulated and measured average daily gains (ADGs) was 137 g/day across all experiments, which equals 20.1% of the measured ADGs. The root mean square error was 170 g/day, which equals 25.0% of the measured ADGs. LiGAPS-Beef successfully simulated the factors that defined and limited growth during the experiments on a daily basis (genotype, heat stress, digestion capacity, energy deficiency and protein deficiency). The simulated factors complied well to the reported occurrence of heat stress, energy deficiency and protein deficiency at specific periods during the experiments. We conclude that the level of accuracy of LiGAPS-Beef is acceptable, and provides a good basis for acquiring insight in the potential and feed-limited production of cattle in different beef production systems across the world. Furthermore, its capacity to identify factors that define or limit growth and production provides scope to use the model for yield gap analysis.
Gegevens van waterbedrijven voor de Grondwateratlas : Technische rapportage, handleiding GWA Input Validator, protocol updates
Kruijne, R. ; Kraalingen, D. van; Roller, J. te; Linden, A.M.A. van der - \ 2018
Wageningen : Wageningen Environmental Research (Wageningen Environmental Research rapport 2854) - 59
De beoordeling van het risico op uitspoeling naar grondwater van gewasbeschermingsmiddelen is vastgelegd in de Beslisboom Uitspoeling. De beslisboom biedt ruimte voor het gebruik van monitoringgegevens. Vanaf 2015 wordt gewerkt aan een methodiek voor gebruik in de toelating, van de Grondwateratlas met als onderdeel de meetresultaten van waterbedrijven en provincies. In opdracht van Vewin zijn meetnetgegevens en meetresultaten van waterbedrijven overgedragen naar de Grondwateratlas, van de waterbedrijven WML, WMD, Brabant Water, Oasen, WBG, Evides, Vitens, PWN. Met subsidie vanuit het TKI-programma Deltatechnologie is de tool Grondwateratlas Input Validator ontwikkeld en is een voorstel protocol uitgewerkt voor reguliere updates van de Grondwateratlas met nieuwe meetresultaten.
Benefits and costs of livestock production across scales: a case study of Dutch egg production
Olde, E.M. de; Linden, A. van der; Boer, I.J.M. de - \ 2018
In: Book of abstracts of the 69th Annual Meeting of the European Federation of Animal Sciences. - Wageningen : Wageningen Academic Publishers (Book of abstracts 24) - ISBN 9789086863235 - p. 250 - 250.
Which sustainability indicators are addressed by livestock models applicable in Europe?
Linden, A. van der; Olde, E.M. de; Mostert, P.F. ; Boer, I.J.M. de - \ 2018
In: Book of Abstracts of the 69th Annual Meeting of the European Federation of Animal Science. - Wageningen : Wageningen Academic Publishers (Book of abstracts 24) - ISBN 9789086863235 - p. 256 - 256.
Meeting the dual demand for animal products and climate change mitigation by narrowing yield gaps
Linden, A. van der; Gerber, P.J. ; Ven, G.W.J. van de; Ittersum, M.K. van; Boer, I.J.M. de; Oosting, S.J. - \ 2018
In: Book of abstracts of the 69th Annual Meeting of the European Federation of Animal Science. - Wageningen : Wageningen Academic Publishers (Book of abstracts 24) - ISBN 9789086863235 - p. 340 - 340.
Botanisch bij de les met abiotische stress
Linden, Gerard van der - \ 2018
Genetic diversity and mechanisms of salt tolerance of Miscanthus
Chen, Chang-Lin - \ 2018
University. Promotor(en): Richard Visser, co-promotor(en): Gerard van der Linden. - Wageningen : Wageningen University - ISBN 9789463433228 - 198
Environmental benefits of leaving offshore infrastructure in the ocean
Fowler, Ashley M. ; Jørgensen, A.M. ; Svendsen, Jon C. ; Macreadie, Peter I. ; Jones, Daniel O.B. ; Boon, Arjen R. ; Booth, David J. ; Brabant, Robin ; Callahan, Emily ; Claisse, Jeremy T. ; Dahlgren, Thomas G. ; Degraer, Steven ; Dokken, Quenton R. ; Gill, Andrew B. ; Johns, David G. ; Leewis, Robert J. ; Lindeboom, Han J. ; Linden, Olof ; May, Roel ; Murk, Albertinka J. ; Ottersen, Geir ; Schroeder, Donna M. ; Shastri, Sunil M. ; Teilmann, Jonas ; Todd, Victoria ; Hoey, Gert Van; Vanaverbeke, Jan ; Coolen, Joop W.P. - \ 2018
Frontiers in Ecology and the Environment (2018). - ISSN 1540-9295 - 8 p.
The removal of thousands of structures associated with oil and gas development from the world’s oceans is well underway, yet the environmental impacts of this decommissioning practice remain unknown. Similar impacts will be associated with the eventual removal of offshore wind turbines. We conducted a global survey of environmental experts to guide best decommissioning practices in the North Sea, a region with a substantial removal burden. In contrast to current regulations, 94.7% of experts (36 out of 38) agreed that a more flexible case-by- case approach to decommissioning could benefit the North Sea environment. Partial removal options were considered to deliver better environmental outcomes than complete removal for platforms, but both approaches were equally supported for wind turbines. Key considerations identified for
decommissioning were biodiversity enhancement, provision of reef habitat, and protection from bottom trawling, all of which are negatively affected by complete removal. We provide recommendations to guide the revision of offshore decommissioning policy, including a temporary suspension of obligatory removal.
Lipase diffusion in oil-filled, alginate micro- and macrobeads
Leusden, P. van; Hartog, G.J.M. den; Bast, A. ; Postema, M. ; Linden, E. van der; Sagis, L.M.C. - \ 2018
Food Hydrocolloids 85 (2018). - ISSN 0268-005X - p. 242 - 247.
Oil digestion - Microbeads - Encapsulation - Diffusion - Maxwell-Cattaneo equation
Triglycerides, which are broken down in the lower part of the intestinal tract, give a stronger ileal brake feedback, resulting in a feeling of satiety and causing people to eat less. The digestion of triglycerides into fatty acids by lipase in the intestine can be delayed by encapsulating oil droplets. In this study the release of fatty acids and oil droplet breakdown in a simulated intestinal system was investigated, for oil droplets encapsulated in alginate micro- (10.7 μm) and macrobeads (1.77 mm). It was found that fatty acid release rate was greatly decreased by encapsulating the oil droplets into an alginate matrix compared to loose droplets. Microscopic imaging of the breakdown of the oil droplets showed a sharp front moving from the bead interface to the centre of the bead, and the change in position of the front scaled linear with time. The motion of the front is well described by combining the mass balance for lipase with a Maxwell-Cattaneo type equation, for the mass flux vector. The front in microbeads seemed to move slightly slower (0.15 (±0.04) μm per minute) than for the macrobeads (0.20 (±0.02) μm per minute). The release of free fatty acids in microbeads was faster than in macrobeads, despite the slower front movement, because of the larger amount of surface area available.
The role of tomato WRKY genes in plant responses to combined abiotic and biotic stresses
Bai, Yuling ; Sunarti, Sri ; Kissoudis, Christos ; Visser, Richard G.F. ; Linden, C.G. van der - \ 2018
Frontiers in Plant Science 9 (2018). - ISSN 1664-462X
Abiotic stress - Biotic stress - Combined stresses - Disease resistance - Effector-triggered immunity (ETI) - PAMP-triggered immunity (PTI)

In the field, plants constantly face a plethora of abiotic and biotic stresses that can impart detrimental effects on plants. In response to multiple stresses, plants can rapidly reprogram their transcriptome through a tightly regulated and highly dynamic regulatory network where WRKY transcription factors can act as activators or repressors. WRKY transcription factors have diverse biological functions in plants, but most notably are key players in plant responses to biotic and abiotic stresses. In tomato there are 83 WRKY genes identified. Here we review recent progress on functions of these tomato WRKY genes and their homologs in other plant species, such as Arabidopsis and rice, with a special focus on their involvement in responses to abiotic and biotic stresses. In particular, we highlight WRKY genes that play a role in plant responses to a combination of abiotic and biotic stresses.

LiGAPS-Beef, a mechanistic model to explore potential and feed-limited beef production 2 : sensitivity analysis and evaluation of sub-models
Linden, A. van der; Ven, G.W.J. van de; Oosting, S.J. ; Ittersum, M.K. van; Boer, I.J.M. de - \ 2018
Animal (2018). - ISSN 1751-7311 - p. 1 - 12.
beef cattle - mechanistic modelling - production ecology - sensitivity analysis - yield gap

The model LiGAPS-Beef (Livestock simulator for Generic analysis of Animal Production Systems – Beef cattle) has been developed to assess potential and feed-limited growth and production of beef cattle in different areas of the world and to identify the processes responsible for the yield gap. Sensitivity analysis and evaluation of model results with experimental data are important steps after model development. The first aim of this paper, therefore, is to identify which parameters affect the output of LiGAPS-Beef most by conducting sensitivity analyses. The second aim is to evaluate the accuracy of the thermoregulation sub-model and the feed intake and digestion sub-model with experimental data. Sensitivity analysis was conducted using a one-at-a-time approach. The upper critical temperature (UCT) simulated with the thermoregulation sub-model was most affected by the body core temperature and parameters affecting latent heat release from the skin. The lower critical temperature (LCT) and UCT were considerably affected by weather variables, especially ambient temperature and wind speed. Sensitivity analysis for the feed intake and digestion sub-model showed that the digested protein per kg feed intake was affected to a larger extent than the metabolisable energy (ME) content. Sensitivity analysis for LiGAPS-Beef was conducted for ¾ Brahman×¼ Shorthorn cattle in Australia and Hereford cattle in Uruguay. Body core temperature, conversion of digestible energy to ME, net energy requirements for maintenance, and several parameters associated with heat release affected feed efficiency at the herd level most. Sensitivity analyses have contributed, therefore, to insight which parameters are to be investigated in more detail when applying LiGAPS-Beef. Model evaluation was conducted by comparing model simulations with independent data from experiments. Measured heat production in experiments corresponded fairly well to the heat production simulated with the thermoregulation sub-model. Measured ME contents from two data sets corresponded well to the ME contents simulated with the feed intake and digestion sub-model. The relative mean absolute errors were 9.3% and 6.4% of the measured ME contents for the two data sets. In conclusion, model evaluation indicates the thermoregulation sub-model can deal with a wide range of weather conditions, and the feed intake and digestion sub-model with a variety of feeds, which corresponds to the aim of LiGAPS-Beef to simulate cattle in different beef production systems across the world.

LiGAPS-Beef, a mechanistic model to explore potential and feed-limited beef production 1 : model description and illustration
Linden, A. van der; Ven, G.W.J. van de; Oosting, S.J. ; Ittersum, M.K. van; Boer, I.J.M. de - \ 2018
Animal (2018). - ISSN 1751-7311 - p. 1 - 11.
beef cattle - growth - mechanistic modelling - production ecology - yield gap

The expected increase in the global demand for livestock products calls for insight in the scope to increase actual production levels across the world. This insight can be obtained by using theoretical concepts of production ecology. These concepts distinguish three production levels for livestock: potential (i.e. theoretical maximum) production, which is defined by genotype and climate only; feed-limited production, which is limited by feed quantity and quality; and actual production. The difference between the potential or limited production and the actual production is the yield gap. The objective of this paper, the first in a series of three, is to present a mechanistic, dynamic model simulating potential and feed-limited production for beef cattle, which can be used to assess yield gaps. A novelty of this model, named LiGAPS-Beef (Livestock simulator for Generic analysis of Animal Production Systems – Beef cattle), is the identification of the defining factors (genotype and climate) and limiting factors (feed quality and available feed quantity) for cattle growth by integrating sub-models on thermoregulation, feed intake and digestion, and energy and protein utilisation. Growth of beef cattle is simulated at the animal and herd level. The model is designed to be applicable to different beef production systems across the world. Main model inputs are breed-specific parameters, daily weather data, information about housing, and data on feed quality and quantity. Main model outputs are live weight gain, feed intake and feed efficiency (FE) at the animal and herd level. Here, the model is presented, and its use is illustrated for Charolais and Brahman × Shorthorn cattle in France and Australia. Potential and feed-limited production were assessed successfully, and we show that FE of herds is highest for breeds most adapted to the local climate conditions. LiGAPS-Beef also identified the factors that define and limit growth and production of cattle. Hence, we argue the model has scope to be used as a tool for the assessment and analysis of yield gaps in beef production systems.

Rheology and microstructure of dispersions of protein fibrils and cellulose microfibrils
Peng, Jinfeng ; Calabrese, Vincenzo ; Veen, Sandra J. ; Versluis, Peter ; Velikov, Krassimir P. ; Venema, Paul ; Linden, Erik van der - \ 2018
Food Hydrocolloids 82 (2018). - ISSN 0268-005X - p. 196 - 208.
Bacterial cellulose microfibrils - Microstructure - Protein fibrils - Rheology - Stability - Whey protein isolate
Mixtures of protein based fibrils and bacterial cellulose based microfibrils (BC) were investigated for macroscopic stability, rheology and microstructure, prepared under different conditions. The protein based fibrils are obtained after prolonged heating of whey protein isolate (WPI) at 80 °C at pH 2. Mixtures of WPI and BC microfibrils at pH 2 were stable at BC microfibril concentrations of 0.2 wt% and above. The mixtures were thixotropic showing hysteresis upon the reversal of the shear flow. Upon prolonged heating, the rheological properties and microstructure of the mixtures at pH 2 were modified. It is concluded that the order of mixing and heating only has an effect on G′ when the BC concentration is low. For the viscosity as a function of shear rate the effect of order of mixing and heating is much smaller.
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
Water-saving potatoes : exploring and characterizing drought tolerance mechanisms
Aliche, Ernest B. - \ 2018
University. Promotor(en): Richard Visser, co-promotor(en): Gerard van der Linden. - Wageningen : Wageningen University - ISBN 9789463432672 - 260
5000 liter water voor één kilo rijst
Linden, Gerard van der; Jongschaap, Raymond - \ 2018
Predicting phase separation in aqueous PEO35-Dextran100 mixtures using a virial expansion
Dewi, B.P.C. ; Venema, P. ; Linden, E. van der - \ 2018
Proteins and polysaccharides, often referred to as biopolymers, are essential building blocks of food systems. These biopolymers have a strong tendency to phase separate, which can be useful to structure foods and to impose specific food structures. The prediction of the extent of phase separation is therefore important to control properties of food systems. In this study, phase separation was specifically studied for aqueous polyethylene oxide (PEO35) and dextran100 at pH 6.8 (20oC). An experimental phase diagram was determined from 234 mixtures of PEO35-dextran100, covering the 1-phase and 2-phase region. Second virial coefficients using membrane osmometry were determined for the PEO35 and dextran100. The values were then used to predict their phase behaviour. We build on previous work following the same approach (Ersch et al., 2016a, Ersch et al., 2016b). The phase diagram as predicted from our second virial approach is in a good agreement with the experimentally determined phase diagram.
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