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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    Sarcopenia and its relation to protein intake across older ethnic populations in the Netherlands: the HELIUS study
    Dorhout, Berber G. ; Overdevest, Elvera ; Tieland, Michael ; Nicolaou, Mary ; Weijs, Peter J.M. ; Snijder, Marieke B. ; Peters, Ron J.G. ; Valkengoed, Irene G.M. Van; Haveman-Nies, Annemien ; Groot, Lisette C.P.G.M. De - \ 2020
    Ethnicity & Health (2020). - ISSN 1355-7858 - p. 1 - 16.
    Objective: To examine the prevalence of sarcopenia and its association with protein intake in men and women in a multi-ethnic population.
    Design: We used cross-sectional data from the HELIUS (Healthy Life in an Urban Setting) study, which includes nearly 25,000 participants (aged 18–70 years) of Dutch, South-Asian Surinamese, African Surinamese, Turkish, Moroccan, and Ghanaian ethnic origin. For the current study, we included 5161 individuals aged 55 years and older. Sarcopenia was defined according to the EWGSOP2. In a subsample (N = 1371), protein intake was measured using ethnic-specific Food Frequency Questionnaires. Descriptive analyses were performed to study sarcopenia prevalence across ethnic groups in men and women, and logistic regression analyses were used to study associations between protein intake and sarcopenia.
    Results: Sarcopenia prevalence was found to be sex- and ethnic-specific, varying from 29.8% in Turkish to 61.3% in South-Asian Surinamese men and ranging from 2.4% in Turkish up to 30.5% in South-Asian Surinamese women. Higher protein intake was associated with a 4% lower odds of sarcopenia in the subsample (OR = 0.96, 95%-CI: 0.92–0.99) and across ethnic groups, being only significant in the South-Asian Surinamese group.
    Conclusion: Ethnic differences in the prevalence of sarcopenia and its association with protein intake suggest the need to target specific ethnic groups for prevention or treatment of sarcopenia.
    Does a high sugar high fat dietary pattern explain the unequal burden in prevalence of type 2 diabetes in a multi-ethnic population in the Netherlands? The HELIUS study
    Huisman, Merel J. ; Soedamah-Muthu, Sabita S. ; Vermeulen, Esther ; Muilwijk, Mirthe ; Snijder, Marieke B. ; Nicolaou, Mary N. ; Valkengoed, Irene G.M. Van - \ 2018
    Nutrients 10 (2018)1. - ISSN 2072-6643
    HELIUS study - HSHF - Multi-ethnic - T2D - Western dietary pattern
    The risk for type 2 diabetes (T2D) in ethnic minorities in Europe is higher in comparison with their European host populations. The western dietary pattern, characterized by high amounts of sugar and saturated fat (HSHF dietary pattern), has been associated with a higher risk for T2D. Information on this association in minority populations is scarce. Therefore, we aimed to investigate the HSHF dietary pattern and its role in the unequal burden of T2D prevalence in a multi-ethnic population in The Netherlands. We included 4694 participants aged 18-70 years of Dutch, South-Asian Surinamese, African Surinamese, Turkish, and Moroccan origin from the HELIUS study. Dutch participants scored the highest on the HSHF dietary pattern, followed by the Turkish, Moroccan, African Surinamese, and South-Asian Surinamese participants. Prevalence ratios (PR) for T2D were then calculated using multivariate cox regression analyses, adjusted for sociodemographic, anthropometric, and lifestyle factors. Higher adherence to an HSHF diet was not significantly related to T2D prevalence in the total study sample (PR 1.04 high versus low adherence, 95% CI: 0.80-1.35). In line, adjustment for HSHF diet score did not explain the ethnic differences in T2D. For instance, the PR of the South-Asian Surinamese vs. Dutch changed from 2.76 (95% CI: 2.05-3.72) to 2.90 (95% CI: 2.11-3.98) after adjustment for HSHF. To conclude, a western dietary pattern high in sugar and saturated fat was not associated with T2D, and did not explain the unequal burden in prevalence of T2D across the ethnic groups.
    Geodata To Control Potato Late Blight In Bangladesh
    Kessel, G. ; Moene, A.F. ; Valkengoed, E. van; Voet, P. van der; Michielsen, J.M. ; Ahsan, H. ; Schmelzer, T. ; Maroof, M. ; Syed, A. ; Hengsdijk, Huib - \ 2017
    In: Proceedings of the sixteenth EuroBlight Workshop. - Wageningen : Wageningen University & Research, Praktijkonderzoek AGV (PAGV-Special Report 18) - p. 59 - 60.
    Modelling and Forecasting of Rice Yield in support of Crop Insurance
    Verseveld, W. van; Weerts, Albrecht ; Trambauer, P. ; Vries, S.C. de; Conijn, J.G. ; Valkengoed, E. van; Hoekman, Dirk ; Hengsdijk, H. ; Schrevel, A. - \ 2016
    The Government of Indonesia has embarked on a policy to bring crop insurance to all of Indonesia’s farmers. To support the Indonesian government, the G4INDO project (www.g4indo.org) is developing/constructing an integrated platform for judging and handling insurance claims. The platform consists of bringing together remote sensed data (both visible and radar) and hydrologic and crop modelling and forecasting to improve predictions in one forecasting platform (i.e. Delft-FEWS, Werner et al., 2013). The hydrological model and crop model (LINTUL) are coupled on time stepping basis in the OpenStreams framework (see https://github.com/openstreams/wflow) and deployed in a Delft-FEWS forecasting platform to support seasonal forecasting of water availability and crop yield. First we will show the general idea about the project, the integrated platform (including Sentinel 1 & 2 data) followed by first (reforecast) results of the coupled models for predicting water availability and crop yield in the Brantas catchment in Java, Indonesia.
    REDD Fast logging assessment & monitoring environment (REDD-FLAME): early detection of deforestation using SAR
    Pearson, T. ; Verhoeven, R. ; Hoekman, D.H. ; Franke, J. ; Valkengoed, E. van - \ 2013
    Supporting nitrogen management in arable farming using unmanned aerial vehicles
    Kooistra, L. ; Bartholomeus, H. ; Becker, R. ; Borne, J. ; Valkengoed, E. van; Serruys, P. ; Voet, P. van der - \ 2012
    In: Proceedings i-SUP 2012, 3rd Conference “Innovation for Sustainable Production”, 06-09 May 2012, Bruges, Belgium. - - p. 5 - 5.
    Satellite-based herbicide rate recommendation for potato haulm killing
    Evert, F.K. van; Voet, P. van der; Valkengoed, E. van; Kooistra, L. ; Kempenaar, C. - \ 2012
    European Journal of Agronomy 43 (2012). - ISSN 1161-0301 - p. 49 - 57.
    nitrogen application - moisture - wheat - crop
    When using variable-rate application (VRA), tractor-mounted sensors are typically used to measure crop status. Crop status can also be measured with a satellite-based sensor. In both cases a vegetation index derived from the sensor measurements is used as an indicator of the amount of crop biomass. The first objective of this study was to establish a relationship between the Weighted Difference Vegetation Index (WDVI) in potato as measured with a nearby, ground-based crop reflectance meter on the one hand and WDVI as measured with remote, satellite-based sensors on the other hand. It was found that groundbased WDVI and satellite-based WDVI are strongly and linearly related, thus making it feasible to calculate herbicide rates for potato haulm killing on the basis of satellite-based measurements. The scale at which VRA is applied is an important determinant of the reduction in input use. The second objective was to estimate the potential to reduce herbicide use for potato haulm killing as a function of the size of decision units, using the above-mentioned relationship, satellite imagery of 13 potato fields and a previously developed decision rule for herbicide rate. It was found that when the size of the decision unit was 15 m × 15 m (the size of an ASTER pixel), a reduction in herbicide use of at least 50% would be achieved in one out of every two of the fields, and a reduction of at least 33% would be achieved in all fields. When the size of the decision unit was 30 m × 30 m, a reduction of at least 33% would be achieved in one out of every two of the fields. In conclusion, satellite-based crop reflectance measurements can be used instead of ground-based measurements for determining herbicide rate for potato haulm killing. When the size of the decision unit is not larger than 30 m ×30 m, a 50% reduction in herbicide use for potato haulm killing can be achieved with VRA
    Satellite- and Ground-Based Measurement of WDVI to Reduce Herbicide Use in Potato Haulm Killing
    Evert, F.K. van; Voet, P. van der; Valkengoed, E. van; Kooistra, L. ; Kempenaar, C. - \ 2011
    Plaatsspecifiek perceelmanagement van de kaart. De toepassing van remote sensing beelden voor de karakterisering van gewaspatronen
    Kooistra, L. ; Bartholomeus, H. ; Lerink, P. ; Valkengoed, E. van - \ 2011
    Wageningen : Wageningen Universiteit - 44
    veldgewassen - akkerbouw - remote sensing - gewasopbrengst - monitoring - zuidhollandse eilanden - precisielandbouw - field crops - arable farming - remote sensing - crop yield - monitoring - zuidhollandse eilanden - precision agriculture
    Het doel van het in dit rapport beschreven onderzoek was om een methode te ontwikkelen voor het genereren van ruimtelijke patronen in gewasontwikkeling en –opbrengst op basis van historische remote sensing beelden. Hiervoor is voor een selectie van 10 percelen een database met een tijdserie van remote sensing beelden (SPOT 5, Landsat, Aster, Worldview-2) opgezet voor de periode 2006-2011 op basis waarvan deze methode zal worden ontwikkeld en toegepast. Als basis voor het genereren van gewas patronen is in dit onderzoek de Weighted Difference Vegetation Index (WDVI) als vegetatie index gebruikt. De gewaspatronen zijn op basis van opnames in augustus 2011 van percelen in de Hoeksche Waard.
    Satellite- and ground-based measurement of WDVI to reduce herbicide use in potato haulm killing
    Evert, F.K. van; Voet, P. ; Valkengoed, E. van; Kooistra, L. ; Kempenaar, C. - \ 2011
    When using variable-rate technology (VRT), tractor-mounted sensors are typically used to measure crop status. Crop status can also be measured with a satellite. The first objective of our work was to establish a relationship between the Weighted Difference Vegetation Index (WDVI) in potato as measured with a Cropscan reflectance meter on the one hand and WDVI as measured with the Aster and Worldview satellites on the other hand. The scale at which VRT is applied is an important determinant of the reduction in input use. The second objective was to estimate the potential to reduce herbicide use for potato haulm killing as a function of the size of decision units, using the above-determined relationship between Cropscan-WDVI and satellite-WDVI, satellite imagery of 13 producers’ fields and a previously developed decision rule for herbicide application. We found that ground-based WDVI and satellite-based WDVI are strongly and linearly related, thus making it feasible to calculate herbicide application rate for potato haulm killing on the basis of satellite-based measurements. We found that when the size of the decision unit was 15 x 15 m2 (the size of an Aster pixel), a reduction in herbicide use of at least 50% would be achieved in one out of every two of the fields, and a reduction of at least 33% would be achieved in all fields. When the size of the decision unit was 30 x 30 m2, a reduction of at least 33% would be achieved in one out of every two of the fields. In conclusion, satellite-measurements can be used in place of ground-based crop reflectance measurements for determining herbicide application rate for potato haulm killing. Our work confirms previous estimates that a 50% reduction in herbicide use for potato haulm killing can be achieved with VRT.
    Upscaling methane emissions from wetland rice fields
    Woerd, H. van der; Bergsma, A. ; Denier van der Gon, H. ; Janssen, L. ; Leeuwen, H. van; Verhoeven, R. ; Valkengoed, E. van; Wal, J.T. van der - \ 2001
    Delft : Netherlands Remote Sensing Board (BCRS), Programme Bureau, Rijkswaterstaat Survey Department - ISBN 9789054113690 - 73
    rijst - bodemeigenschappen - bodemchemie - broeikaseffect - methaan - schaalverandering - rice - soil properties - soil chemistry - greenhouse effect - methane - scaling
    Bovine herpesvirus 4 in bovine clinical mastitis
    Wellenberg, G.J. ; Poel, W.H.M. van der; Vorst, T.J. van der; Valkengoed, P.H. van; Schukken, Y.H. ; Wagenaar, F. ; Oirschot, J.T. van - \ 2000
    Veterinary Record 147 (2000)8. - ISSN 0042-4900 - p. 222 - 225.
    Upscaling methane emissions from wetland rice fields (UPRICE)
    Bergsma, A. ; Denier, H. van der; Janssen, L. ; Leeuwen, H. van; Verhoeven, R. ; Valkengoed, E. van; Wal, J.T. van der - \ 2000
    In: Upscaling methane emissions from wetland rice fields . Feasibility study on employing radar data for the Philippines - final report to the BCRS on phase-1 - \\Project 4.2/AP-09 / Hans van der Woerd Amsterdam : Institute for EnvironmentalStudies - p. 1 - 50.
    Remote sensing monitoring system for sustainable forest management and land cover change in Indonesia
    Hoekman, D.H. ; Varekamp, C. ; Jong, J.J. de; Valkengoed, E.H. van; Vissers, M.A.M. ; Wooding, M.G. - \ 1999
    Delft : Netherlands Remote Sensing Board (BCRS) - ISBN 9789054112730 - 77
    tropische regenbossen - landgebruik - monitoring - remote sensing - indonesië - tropical rain forests - land use - monitoring - remote sensing - indonesia
    The oxidation of 1-alkyl(aryl)quinolinium chlorides with rabbit liver aldehyde oxidase
    Angelino, S.A.G.F. ; Valkengoed, B.H. van; Buurman, D.J. ; Plas, H.C. van der; Muller, F. - \ 1984
    Journal of heterocyclic chemistry 21 (1984). - ISSN 0022-152X - p. 107 - 112.
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