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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Bodembiologie in het natuurbeheer : Nieuwe inzichten en perspectieven
Gerrits, Gijs ; Putten, W.H. van der - \ 2019
Vakblad Natuur Bos Landschap (2019)156. - ISSN 1572-7610 - p. 3 - 7.
Natuurbeheerders denken bij bodem al snel aan abiotische factoren zoals de concentratie stikstof en fosfaat, het organisch stofgehalte, de pH en de structuur. Dit leer je in de meeste groene opleidingen. Langzaam aan groeit echter het besef bij natuurbeheerders dat ook de bodembiologie een belangrijke rol speelt in de structurering van de vegetatie. Dit artikel geeft een inkijkje in belangrijke nieuwe kennis, hypotheses en mogelijke nieuwe perspectieven voor het natuurbeheer.
Future directions for the concept of salutogenesis: a position article
Bauer, G.F. ; Roy, M. ; Bakibinga, P. ; Contu, P. ; Downe, S. ; Eriksson, M. ; Espnes, G.A. ; Jensen, B.B. ; Juvinya Canal, D. ; Lindström, B. ; Mana, A. ; Mittelmark, M.B. ; Morgan, A.R. ; Pelikan, J.M. ; Saboga-Nunes, L. ; Sagy, S. ; Shorey, S. ; Vaandrager, L. ; Vinje, H.F. - \ 2019
Health Promotion International (2019). - ISSN 0957-4824
Aaron Antonovsky advanced the concept of salutogenesis almost four decades ago (Antonovsky, Health, Stress and Coping. Jossey-Bass, San Francisco, CA, 1979; Unravelling the Mystery of Health. Jossey-Bass, San Francisco, CA, 1987). Salutogenesis posits that life experiences shape the sense of coherence (SOC) that helps to mobilize resources to cope with stressors and manage tension successfully (determining one’s movement on the health Ease/Dis-ease continuum). Antonovsky considered the three-dimensional SOC (i.e. comprehensibility, manageability, meaningfulness) as the key answer to his question about the origin of health. The field of health promotion has adopted the concept of salutogenesis as reflected in the international Handbook of Salutogenesis (Mittelmark et al., The Handbook of Salutogenesis. Springer, New York, 2016). However, health promotion mostly builds on the more vague, general salutogenic orientation that implies the need to foster resources and capacities to promote health and wellbeing. To strengthen the knowledge base of salutogenesis, the Global Working Group on Salutogenesis (GWG-Sal) of the International Union of Health Promotion and Education produced the Handbook of Salutogenesis. During the creation of the handbook and the regular meetings of the GWG-Sal, the working group identified four key conceptual issues to be advanced: (i) the overall salutogenic model of health; (ii) the SOC concept; (iii) the design of salutogenic interventions and change processes in complex systems; (iv) the application of salutogenesis beyond health sector. For each of these areas, we first highlight Antonovsky’s original contribution and then present suggestions for future development. These ideas will help guide GWG-Sal’s work to strengthen salutogenesis as a theory base for health promotion.
Planty Organic: voortgang 2018
Burgt, G.J. van der; Rietema, C. ; Bus, M. ; Timmermans, B.G.H. - \ 2019
Driebergen : Louis Bolk Instituut - 45 p.
Planty Organic is a project and an experimental field in which an arable farming system is developed based on 100% nitrogen input by fixation and non-ploughing. It is started in 2012. An evaluation report has been published (Van der Burgt et al., 2017b) on the period 2012-2016. The system can be used to earn new knowledge that can be applied in the organic or conventional agriculture, on the themes of nitrogen-, phosphorus- or soil-dynamics.This report focuses on the 2018 practice and results, referring to the evaluation report. The 2018 experiences confirm the system performance as described in the evaluation. All goals are achieved: it is a productive system with a high nitrogen efficiency and a very low environmental and climate impact.The production in 2017 was roughly the level as it is expected in the evaluation. This is confirmed in a system simulation with the Ndicea model. It is not plausible that the 2017 production level will be continuously realized. Research questions remain on the internal nutrient dynamics (nitrogen and phosphorus), soil life, rooting systems and CO2 footprint.
Paardengenomica: wiki Groen Kennisnet
Ducro, B.J. - \ 2019
Wageningen : Groen Kennisnet
Genomica (of genomics) verwijst naar de techniek waarmee we de opbouw en de werking van het DNA kunnen bestuderen. Op het DNA ligt de genetische aanleg voor de bouw en functionering van het lichaam. Dus als we het DNA beter kunnen lezen en begrijpen dan kunnen we een betere inschatting van de genetische aanleg maken. Genomica doet nu in snel tempo zijn intrede in de paardenfokkerij. Het wordt al veelvuldig gebruikt in de fokkerij van landbouwhuisdieren zoals koeien, varkens en kippen, en heeft tot grote veranderingen in de fokprogramma’s geleid. Genomica biedt grote voordelen waardoor we efficiënter kunnen fokken en dus ook sneller vooruit kunnen gaan.
Wie is er bang... Wil Nederland wel samenleven met de wolf?
Jacobs, Maarten ; Elands, Birgit ; Bovenkerk, Bernice - \ 2019

Ecologen wachten met smart op beschuit met muisjes van de Veluwe. Misschien zíjn er zelfs al welpjes geboren. Het maakt de vraag prangend: hoe welkom is de wolf eigenlijk? Experts zijn er pessimistisch over. ‘In Finland houden ze al protestmarsen.’

Kracht van tegel-voor-plantruilacties is dat er weinig voor nodig is om al een effect te hebben
Krekels, Daan ; Metselaar, K. ; Spijker, J.H. - \ 2019
Vakblad Groen 2019 (2019)05. - ISSN 1660-3534 - p. 18 - 21.
Agricultural Development in Iraq: Opportunities and Challenges
Jongerden, Joost - \ 2019
High level meeting and conference on agricultural development and water management in Iraq, The conference included from Iraqi side the first lady Dr Sarbagh Salih, minister of Agriculture Dr. Saleh al-Hassani and Minister of Environment Dr. Jamal al Adely, and from the side of the Netherlands the deputy ambassador in Iraq, Mr Eric Strating. At the meeting rector Prof. dr. Arthur Mol and Dr Sarbagh Salih signed a letter of intent for cooperation in the field of agriculture.
Draft Genome Sequence of Streptococcus suis S10, a Virulent Strain Used in Experimental Pig Infections
Gaiser, R.A. ; Zomer, A.L. ; Wells, J.M. ; Baarlen, P. van - \ 2019
- 3 p.
Here, we report the draft whole-genome sequence of Streptococcus suis strain S10, isolated from the tonsils of a healthy pig. S. suis S10 belongs to the highly virulent serotype 2, which includes isolates that cause infectious diseases, including meningitis, in pigs and human. The genome contains a complete prophage that encodes a candidate virulence gene.
What is the best housing temperature to translate mouse experiments to humans?
Keijer, Jaap ; Li, Min ; Speakman, John R. - \ 2019
Molecular Metabolism (2019). - ISSN 2212-8778
Basal metabolic rate - Comparative physiology - Housing temperature - Human - Mouse - Thermoneutrality

Objectives: Ambient temperature impinges on energy metabolism in a body size dependent manner. This has implications for the housing temperature at which mice are best compared to humans. In 2013, we suggested that, for comparative studies, solitary mice are best housed at 23–25 °C, because this is 3–5 °C below the mouse thermoneutral zone and humans routinely live 3–5 °C below thermoneutrality, and because this generates a ratio of DEE to BMR of 1.6–1.9, mimicking the ratio found in free-living humans. Methods: Recently, Fischer et al. (2017) challenged this estimate. By studying mice at 21 °C and at 30 °C (but notably not at 23–25 °C) they concluded that 30 °C is the optimal housing temperature. Here, we measured energy metabolism of C57BL/6 mice over a range of temperatures, between 21.4 °C and 30.2 °C. Results: We observed a ratio of DEE to BMR of 1.7 at 27.6 °C and of 1.8 at 25.5 °C, suggesting that this is the best temperature range for housing C57BL/6 mice to mimic human thermal relations. We used a 24 min average to calculate the ratio, similar to that used in human studies, while the ratio calculated by Fisher et al. dependent on short, transient metabolic declines. Conclusion: We concur with Fisher et al. and others that 21 °C is too cool, but we continue to suggest that 30 °C is too warm. We support this with other data. Finally, to mimic living environments of all humans, and not just those in controlled Western environments, mouse experimentation at various temperatures is likely required.

Institutionalized Communication in Markets and Firms
Dolfsma, Wilfred - \ 2019
Journal of Economic Issues 53 (2019)2. - ISSN 0021-3624 - p. 341 - 348.
communication - firms as institutionalized communication - institutions - markets as institutionalized communication

Abstract: How markets and firms function is critically related to what knowledge and information is exchanged between whom, how quickly. Exchange of (symbolic) information needs to be properly institutionalized in order to be understood by others, on the one hand, but, on the other hand, cannot avoid being ambiguous to some degree as well (Dolfsma et al. 2011). Ambiguity allows for the dissent that allows for innovation in the broadest sense of the term. Institutionalization of communication is community-specific. The tension between institutionalization of and ambiguity in communication explains why innovations cannot depart too much from what is known and accepted in a community to be (ultimately) accepted as a legitimate novelty. The view of markets and firms as settings for institutionalized communication and knowledge exchange offers a perspective that institutional economists are well positioned for to offer insights on.

Soil Salinity Limits Plant Shade Avoidance
Hayes, Scott ; Pantazopoulou, Chrysoula K. ; Gelderen, Kasper van; Reinen, Emilie ; Tween, Adrian Louis ; Sharma, Ashutosh ; Vries, Michel de; Prat, Salomé ; Schuurink, Robert C. ; Testerink, Christa ; Pierik, Ronald - \ 2019
Current Biology 29 (2019)10. - ISSN 0960-9822 - p. 1669 - 1676.e4.
abscisic acid - brassinosteroids - phytochrome - phytohormones - PIF - plant photobiology - salt response - salt stress

Global food production is set to keep increasing despite a predicted decrease in total arable land [1]. To achieve higher production, denser planting will be required on increasingly degraded soils. When grown in dense stands, crops elongate and raise their leaves in an effort to reach sunlight, a process termed shade avoidance [2]. Shade is perceived by a reduction in the ratio of red (R) to far-red (FR) light and results in the stabilization of a class of transcription factors known as PHYTOCHROME INTERACTING FACTORS (PIFs) [3, 4]. PIFs activate the expression of auxin biosynthesis genes [4, 5] and enhance auxin sensitivity [6], which promotes cell-wall loosening and drives elongation growth. Despite our molecular understanding of shade-induced growth, little is known about how this developmental program is integrated with other environmental factors. Here, we demonstrate that low levels of NaCl in soil strongly impair the ability of plants to respond to shade. This block is dependent upon abscisic acid (ABA) signaling and the canonical ABA signaling pathway. Low R:FR light enhances brassinosteroid (BR) signaling through BRASSINOSTEROID SIGNALING KINASE 5 (BSK5) and leads to the activation of BRI1 EMS SUPPRESSOR 1 (BES1). ABA inhibits BSK5 upregulation and interferes with GSK3-like kinase inactivation by the BR pathway, thus leading to a suppression of BES1:PIF function. By demonstrating a link between light, ABA-, and BR-signaling pathways, this study provides an important step forward in our understanding of how multiple environmental cues are integrated into plant development. Intensively farmed crops often experience multiple stresses simultaneously. Here, Hayes et al. show that low-level soil salinity suppresses shade avoidance in plants. Through investigation of the mechanisms underlying this trait, they uncover a regulatory pathway that converges at the level of brassinosteroid signaling.

Phosphorus recovery from co-digested pig slurry : development of the RePeat process
Regelink, Inge ; Ehlert, Phillip ; Smit, Geo ; Everlo, Sjoerd ; Prinsen, Arjan ; Schoumans, Oscar - \ 2019
Wageningen : Wageningen Environmental Research (Wageningen Environmental Research report 2949) - 65
In the Netherlands, the agricultural sector produces more manure than can be applied on agricultural land within the P application standards. The excess amount of manure should be exportedto other regions with a demand for P fertilisers. An alternative for current manure export is manure processing in which manure is processed into valuable fertiliser products. This reports describes a process in which the solid fraction of co-digested manure is processed into a concentrated P fertiliser and a nutrient-poor organic soil improver. The recovered P fertiliser can be used as a secondary raw material for fertiliser production or for export whereas the soil improver can be used on arable soils in the nearby region of the manure treatment plant. The separation process, called RePeat, consists of a acidification and dilution step to extract P from the solid fraction followed by a base addition step to recovery P. The proof of principle was given in a previous report (Schoumans et al., 2017). This reports describes additional laboratory and pilot tests (Chapter 2-4). Attention was given to the reuse of water within the process, the dewatering of calcium phosphate versus struvite and the selection of separation equipment for a demonstration plant. Chapter 5 gives the process mass balances calculated using a mass balance model. Chapter 6 assesses the quality of the organic soil improver in terms of its carbon- and nitrogen mineralisation rate. An example of a business case for the process is included in Chapter 7. The results were used to design a demonstration plant for the RePeat process to be built at Groot Zevert Vergisting B.V. in Beltrum.
'Theoretisch bieden daken genoeg plek': Waar laat Nederland al die zonnepanelen?
Zee, Friso van der - \ 2019
Effects of sub-optimal mobility on production performance of pasture-based dairy cows
O'Connor, A. ; Bokkers, Eddie ; Boer, I.J.M. de; Hogeveen, H. ; Sayers, R. ; Byrne, N. ; Ruelle, E. ; Shalloo, L. - \ 2019
In: Advances in Animal Biosciences. - - p. 73 - 73.
Sub-optimal mobility has been identified as the third most important health-related economic loss, after
fertility and mastitis (Bruijnis et al., 2010, Alawneh et al., 2011, Huxley, 2013). It is well known that severe forms of suboptimal
mobility cause losses in terms of milk yield (Enting et al., 1997); however, less is known about the effects of mild
forms of sub-optimal mobility on milk yield and other production performance parameters. Therefore, the objective of this
study was to investigate the effect of sub-optimal mobility on production performance in pasture-based dairy cows.
Selecting the dose metric in reverse dosimetry based QIVIVE : Reply to: ‘Comment on ‘Use of an in vitro–in silico testing strategy to predict inter-species and inter-ethnic human differences in liver toxicity of the pyrrolizidine alkaloids lasiocarpine and riddelliine’ by Ning et al.
Rietjens, Ivonne M.C.M. ; Ning, Jia ; Chen, Lu ; Wesseling, Sebastiaan ; Strikwold, Marije ; Louisse, Jochem - \ 2019
Archives of Toxicology 93 (2019)5. - ISSN 0340-5761 - p. 1467 - 1469.
Vissen bij wisselend tij : een notitie over de (cumulatieve) sociaaleconomische effecten van ontwikkelingen die invloed hebben op de Nederlandse kottervisserij
Mol, A. ; Zaalmink, B.W. ; Steins, N.A. ; Kraan, M.L. - \ 2019
Wageningen : Wageningen Economic Research (Wageningen Wageningen Economic Research nota 2019-063) - 17
Naar aanleiding van het rapport ‘Wind op zee’ (Mol et al. 2019) is de vraag gesteld of en hoe de huidige ontwikkelingen, waar de visserijsector mee te maken heeft (Brexit, aanlandplicht en het intrekken van de pulsontheffingen), invloed hebben op de economische waarde voor de visserij in de windparkgebieden en hoe deze ontwikkelingen elkaar beïnvloeden. In deze notitie worden deze interacties kwalitatief omschreven. Daarnaast worden aanbevelingen gedaan om tot een kwantitatieve berekening van de economische gevolgen te komen door middel van het bepalen van scenario’s en het bouwen van een model.
A diagnostic equation for the maximum urban heat island effect of a typical Chinese city: A case study for Xi'an
Zhang, Xi ; Steeneveld, Gert-Jan ; Zhou, Dian ; Duan, Chengjiang ; Holtslag, Albert A.M. - \ 2019
Building and Environment 158 (2019). - ISSN 0360-1323 - p. 39 - 50.
China - Diagnostic equation - Neighborhood-scale - Urban heat island - Urban morphology - Xi'an

To reduce the vulnerability of urban areas facing high temperatures, it is useful to develop methods to obtain the urban heat island (UHI)intensity. However, it is hard to equip all cities with extensive measurement networks and alternative UHI diagnostic methods are needed. Accordingly, in this paper we evaluate and revise the diagnostic equation designed by Theeuwes et al. (2017)and analyze its application for Xi'an (China), based on long-term summer meteorology data. The evaluation of the default diagnostic equation shows that limited accuracy for Xi'an is caused by the sum of morphological parameters being used outside the original range of calibration. Subsequently, we propose an extended equation, which adds the building fraction to express the morphology of additional spatial categories. This new equation is calibrated against a 3-year dataset and independently validated with data from another year. In addition, a class prediction with three spatial categories is proposed, and verified by independent data of 20 stations in Xi'an in 2018, which enables this formula to be applied in more cities. Altogether, the extended diagnostic equation is an effective method to evaluate the daily maximum UHI intensity (UHI max )on neighborhood-scale, which can be generalized for a whole city area and presents internal intensity differences with multi-points.

Steeds agressievere Phytophthora vraagt nog preciezer werken
Schepers, Huub ; Kessel, Geert Jan - \ 2019

De opkomst van nieuwe agressievere stammen van Phytophthora infestans vraagt volgens WUR-onderzoekers Huub Schepers en Geert Kessel extra alertheid. "De nieuwe klonen EU-36 (Geel 36) en EU-37 (dondergroen 370 verdringen de ook al lastig te bestrijden EU-13 (blauw 13). De middelkeuze, dosering en timing van de bespuitingen komen dus nog preciezer in aanwezigheid van deze twee nieuwe klonen dan tijdens de situatie van zo'n twee jaar geleden, benadrukken de phytophthoraspecialisten.

Hoe goed zuiveren planten de lucht nu echt?
Visser, P.H.B. de - \ 2019
Onder Glas 16 (2019)1. - p. 35 - 35.
Al langere tijd wordt beweerd dat planten de lucht zuiveren van vluchtige organische stoffen.
High sediment export from a trans-Himalayan semi-desert driven by late Holocene climate change and human impact
Reimann, T. ; Menges, Johanna ; Hovius, Niels ; Andermann, Christoff ; Dietze, Michael ; Swoboda, Charlie ; Cook, Kirsten ; Vieth-Hillebrand, Andrea ; Bonnet, Stephane ; Sachse, Dirk - \ 2019
- 1 p.
Sediment export rates are sensitive to changes in climate, vegetation and human impact, but the direct response of a given landscape to such changes is difficult to unravel. Here, we report a strong landscape response to a disturbance
of a stable, soil covered landscape in a trans-Himalayan valley, which was pushed over an eco-geomorphic tipping point resulting in fast and widespread erosion. We then identify potential drivers for this transition. The upper Kali Gandaki (KG) river valley in Nepal drains the southern edge of the Tibetan plateau in the rain shadow of the High Himalayas, where a scarcely vegetated semi-desert is dissected by deep gullies. These badlands formed in a graben structure storing large amounts of unconsolidated sediments which provide a source of erosion product to the high stream-power river. Due to the high erodibility of this material, the region is particularly sensitive to changes in climate and land use. At the outlet of the upper valley, we estimate that river
suspended sediment concentrations are up to two orders of magnitude higher for a given river discharge than downstream in the monsoon dominated High Himalayan river segment. Even though precipitation rates are low in the upper valley (160 mm/yr to 250 mm/yr) and discharges rarely exceed 100 m3/s, we show that modern erosion efficiency is around five times higher than in the steep and wet, landslide dominated southern part of the catchment. In stark contrast to this modern setting, widespread occurrence of paleosol horizons reflects the persistence of geomorphologically stable conditions during the Holocene until 2.4 ka based on OSL and 14C ages. What pushed this landscape from a soil covered stable state into the erosional state observed today?We investigated human land use and climate change as possible drivers of this transition. Human impact on the landscape has been suggested from 5.4 ka onwards (Miehe et al., 2009) and an increased occurence of archeological sites and evidence of
grazing animals has been reported from 3 ka (Simons et al.,1994). We estimated paleo-hydrological conditions using the hydrogen isotopic composition of plant lipids (Dwax) extracted from the paleosol horizons in the upper KG valley (3500 - 4100 m asl., n=24). Dwax values range from 214 h to 236 h which is offset by 40 h 6 h from the Dwax values of modern shrub leaves sampled at the paleosol sites and modern topsoils sampled along the wetter fringes of the valley. This strongly suggests that soil formation took place under substantially wetter conditions, i.e. an enhanced monsoonal precipitation in the past. The subsequent Late Holocene drying trend combined with human land use likely reduced vegetation cover which then initiated the transition to badland development observed today. Current erosion rates suggest a catchment-average surface lowering rate of one meter per 1000 years, resulting in a strong and irreversible degradation of the landscape and its soils.
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