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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    Strategy to identify and quantify polysaccharide gums in gelled food concentrates
    Grün, C.H. ; Sanders, P. ; Burg, M. van der; Schuurbiers, E. ; Adrichem, L. van; Velzen, E.J.J. van; Roo, N. de; Brunt, K. ; Westphal, Y. ; Schols, H.A. - \ 2015
    Food Chemistry 166 (2015). - ISSN 0308-8146 - p. 42 - 49.
    locust bean gum - polymerase-chain-reaction - guar gum - capillary-electrophoresis - enzymatic determination - starch industry - raw-materials - xanthan gum - identification - additives
    A strategy for the unambiguous identification and selective quantification of xanthan gum and locust bean gum (LBG) in gelled food concentrates is presented. DNA detection by polymerase chain reaction (PCR) showed to be a fast, sensitive, and selective method that can be used as a first screening tool in intact gelled food concentrates. An efficient isolation procedure is described removing components that may interfere with subsequent analyses. NMR spectroscopy enabled the direct identification of xanthan gum and the discrimination between different galactomannans in the isolated polysaccharide fraction. An enzymatic fingerprinting method using endo-ß-mannanase, in addition to being used to differentiate between galactomannans, was developed into a selective, quantitative method for LBG, whereas monosaccharide analysis was used to quantify xanthan gum. Recoveries for xanthan gum and LBG were 87% and 70%, respectively, with in-between day relative standard deviations below 20% for xanthan gum and below 10% for LBG.
    Beoordeling mogelijke PAS maatregelen : plausibiliteit van werking Agriton systeem
    Melse, R.W. ; Ogink, N.W.M. - \ 2015
    Wageningen : Wageningen UR Livestock Research (Livestock Research rapport 901) - 159
    rundveehouderij - rundveedrijfmest - toevoegingen - ammoniakemissie - emissiereductie - mestverwerking - cattle husbandry - cattle slurry - additives - ammonia emission - emission reduction - manure treatment
    Beoordeling van de mogelijke werking van het AGRITON systeem om ammoniakemissie uit rundveestallen tegen te gaan. De maatregel behelst het op regelmatige basis toevoegen van een middel aan verse rundveedrijfmest in de mestkelder.
    Microplastic in a macro filter feeder: humpback whale Megaptera novaeangliae
    Besseling, E. ; Foekema, E.M. ; Franeker, J.A. van; Leopold, M.F. ; Bravo Rebolledo, E. ; Kühn, S. ; Mielke, L. ; Heberle-Bors, E. ; Ijzer, J. ; Kamminga, P. ; Koelmans, A.A. - \ 2015
    Marine Pollution Bulletin 95 (2015)1. - ISSN 0025-326X - p. 248 - 252.
    marine-environment - plastic ingestion - balaenoptera-physalus - mediterranean sea - north-sea - debris - identification - pollutants - particles - additives
    Marine filter feeders are exposed to microplastic because of their selection of small particles as food source. Baleen whales feed by filtering small particles from large water volumes. Macroplastic was found in baleen whales before. This study is the first to show the presence of microplastic in intestines of a baleen whale (Megaptera novaeangliae). Contents of its gastrointestinal tract were sieved, dissolved in 10% potassium hydroxide and washed. From the remaining dried material, potential synthetic polymer particles were selected based on density and appearance, and analysed by Fourier transform infrared (FTIR) spectroscopy. Several polymer types (polyethylene, polypropylene, polyvinylchloride, polyethylene terephthalate, nylon) were found, in varying particle shapes: sheets, fragments and threads with a size of 1 mm to 17 cm. This diversity in polymer types and particle shapes, can be interpreted as a representation of the varying characteristics of marine plastic and the unselective way of ingestion by M. novaeangliae.
    Influence of Pluronic F127 on the distribution and functionality of inkjet-printed biomolecules in porous nitrocellulose substrates
    Mujawar, L.H. ; Amerongen, A. van; Norde, W. - \ 2015
    Talanta 131 (2015). - ISSN 0039-9140 - p. 541 - 547.
    protein microarrays - spot morphology - block-copolymer - antibody - surfaces - additives - membrane - flow - hydrophobicities - orientation
    The distribution of inkjet-printed biomolecules in porous nitrocellulose substrates often results in a non-homogeneous spot morphology commonly referred to as 'doughnut-shaped' spots. We have studied the influence of Pluronic F127 (an amphiphilic surfactant) on the functionality of inkjet-printed primary antibody molecules and on the final assay result by performing a one-step antibody binding assay in the nitrocellulose substrate. The primary antibody was printed with and without Pluronic, followed by the addition of double-labelled amplicons as antigen molecules and a fluorophore-labelled streptavidin as detection conjugate. The distribution of the fluorescence intensity down into the nitrocellulose substrate was investigated by confocal laser scanning microscopy in 'Z' stacking mode. Each horizontal slice was further analysed by applying a concentric ring format and the fluorescence intensity in each slice was represented in a colour-coded way. The mean and total fluorescence intensity of the antibody binding assay (fluorescent streptavidin) showed a peak at 0.2% (w/v) Pluronic F127. In addition, an improved spot morphology was observed also peaking at the same Pluronic concentration. Subsequently, we investigated the direct influence of Pluronic F127 on the location of the primary antibody molecules by labelling these molecules with the fluorophore Alexa-488. Our results show that upon increasing the concentration of Pluronic F127 in the printing buffer, the spot diameter increased and the number of primary antibody molecules bound in the spot area gradually decreased. This was confirmed by analysing the distribution of fluorescently labelled primary antibody molecules down into the membrane layers. We conclude that a particular ratio between primary antibody and Pluronic F127 molecules in combination with available substrate binding capacity results in an optimal orientation, that is Fab-UP, of the primary antibody molecules. Consequently, an increased number of antigen molecules (in our case the labelled amplicons) and of the fluorescent detection conjugate (streptavidin) will give an optimal signal. Moreover, distribution of the primary antibody molecules was more homogeneous at the optimal Pluronic F127 concentration, contributing to the better spot morphology observed.
    Distribution of biomolecules in porous nitrocellulose membrane pads using confocal laser scanning microscopy and high-speed cameras
    Mujawar, L.H. ; Maan, A.A. ; Khan, M.K.I. ; Norde, W. ; Amerongen, A. van - \ 2013
    Analytical Chemistry 85 (2013)7. - ISSN 0003-2700 - p. 3723 - 3729.
    printed protein molecules - antibody microarrays - spot morphology - liquid-drops - additives - surfaces - flow
    The main focus of our research was to study the distribution of inkjet printed biomolecules in porous nitrocellulose membrane pads of different brands. We produced microarrays of fluorophore-labeled IgG and bovine serum albumin (BSA) on FAST, Unisart, and Oncyte-Avid slides and compared the spot morphology of the inkjet printed biomolecules. The distribution of these biomolecules within the spot embedded in the nitrocellulose membrane was analyzed by confocal laser scanning microscopy in the “Z” stack mode. By applying a “concentric ring” format, the distribution profile of the fluorescence intensity in each horizontal slice was measured and represented in a graphical color-coded way. Furthermore, a one-step diagnostic antibody assay was performed with a primary antibody, double-labeled amplicons, and fluorophore-labeled streptavidin in order to study the functionality and distribution of the immune complex in the nitrocellulose membrane slides. Under the conditions applied, the spot morphology and distribution of the primary labeled biomolecules was nonhomogenous and doughnut-like on the FAST and Unisart nitrocellulose slides, whereas a better spot morphology with more homogeneously distributed biomolecules was observed on the Oncyte-Avid slide. Similar morphologies and distribution patterns were observed when the diagnostic one-step nucleic acid microarray immunoassay was performed on these nitrocellulose slides. We also investigated possible reasons for the differences in the observed spot morphology by monitoring the dynamic behavior of a liquid droplet on and in these nitrocellulose slides. Using high speed cameras, we analyzed the wettability and fluid flow dynamics of a droplet on the various nitrocellulose substrates. The spreading of the liquid droplet was comparable for the FAST and Unisart slides but different, i.e., slower, for the Oncyte-Avid slide. The results of the spreading of the droplet and the penetration behavior of the liquid in the nitrocellulose membrane may (partly) explain the distribution of the biomolecules in the different slides. To our knowledge, this is the first time that fluid dynamics in diagnostic membranes have been analyzed by the use of high-speed cameras.
    Feed additives : annual report 2012 of the National Reference Laboratory
    Driessen, J.J.M. ; Beek, W.M.J. ; Zuidema, T. ; Jong, J. de - \ 2013
    Wageningen : RIKILT Wageningen UR (Report / RIKILT Wageningen UR 2013.008) - 15
    voedertoevoegingen - toevoegingen - conserveermiddelen - versterkers (enhancers) - voer - mycotoxinen - feed additives - additives - preservatives - enhancers - feeds - mycotoxins
    This report of the Dutch National Reference Laboratory (NRL) for feed additives (RIKILT Wageningen UR) descreibes the activities employed in 2012. The main tasks of the NRL are: providing assistance to the European Union Reference Laboratory (EURL) on their request, as well as providing advice and support to the competent authority, which is the Dutch Ministry of Economic Affairs - Department 'Plantaardige Agroketens en Voedselkwaliteit'.
    Zaadbehandeling met additieven
    Derkx, M.P.M. - \ 2013
    Boom in business 2013 (2013)3. - ISSN 2211-9884 - p. 50 - 51.
    houtachtige planten als sierplanten - rosa - zaadbehandeling - toevoegingen - plantenontwikkeling - gewasbescherming - landbouwkundig onderzoek - ornamental woody plants - rosa - seed treatment - additives - plant development - plant protection - agricultural research
    Voor het eerst is er onderzoek gedaan naar het effect van additieven op het zaad van de onderstam Rosa corymbifera 'Laxa'. Voor één beuken- en twee naaldbomensoorten ligt er inmiddels een onderzoeksvoorstel klaar.
    Benthos herstel Suppletie: onderzoek naar het herstel van de benthische macrofauna na de proefsuppletie op de Glageplaat en bepaling van mogelijke factoren die de rekolonisatiesnelheid beinvloeden
    Imares, ; Schaap, J. - \ 2012
    Yerseke : IMARES (Rapport / IMARES Wageningen UR nr. : 12.012) - 63
    wetlands - erosiebestrijding - zandsuppletie - toevoegingen - morfologie - macrofauna - ecologisch herstel - stormvloedkeringen - oosterschelde - wetlands - erosion control - sand suppletion - additives - morphology - macrofauna - ecological restoration - storm surge barriers - eastern scheldt
    Rijkswaterstaat Zeeland zal in de toekomst mogelijk suppletiewerkzaamheden verrichten in de Oosterschelde om de gevolgen van de zandhonger te herstellen. Zandhonger is het proces van afbraak van platen, slikken en schorren in de Oosterschelde als gevolg van het verminderde getijvolume en zandtransport door de bouw van de stormvloedkering en de compartimeringswerken. De hoogte van de suppletie is dus niet overal gelijk, maar bestaat uit een hoger centraal deel en een lager zuidelijk deel. Het doel van de proefsuppletie was om inzicht te krijgen in de ecologische en morfologische ontwikkeling in ruimtelijke en temporele zin. Tevens beoogde de uitvoering van de suppletie meer kennis te verschaffen over de rekolonisatie van het bodemleven op de suppletie.
    'Echt onnatuurlijk is fruit in de melk' : toevoegingen aan biologische producten: discussies en verlangens
    Bakker, H.C.M. de; Immink, V.M. ; Tacken, G.M.L. ; Ruissen, A. - \ 2011
    Den Haag : LEI Wageningen UR (Nota / LEI : Onderzoeksveld Consument & gedrag ) - 26
    consumentengedrag - voedselkwaliteit - biologische voedingsmiddelen - houding van consumenten - toevoegingen - voedseladditieven - consumer behaviour - food quality - organic foods - consumer attitudes - additives - food additives
    Aanleiding voor deze nota is de vraag of toevoegingen aan biologische voedselproducten wringen met het imago van natuurlijkheid. Kunnen deze producten rekenen op instemming van (biologische) voedselgebruikers? Door middel van workshops en discussies is de mening van producenten, verwerkers en gebrukers onderzocht. In plaats van te spreken over wetenschappelijke conclusies, worden de resultaten van dit project liever gezien als bouwstenen voor discussie. Want er is nog veel onduidelijk over wat er van consumenten verwacht kan worden als het gaat om hun houdingen ten aanzien van natuurlijkheid, toevoegingen en biologisch en hun (daadwerkelijk) koopgedrag. En ook al zouden hierover meer onderbouwde conclusies gepresenteerd kunnen worden, dan nog is het aan de biologische branche zelf om hun visie te bepalen hoe men zich in de markt wil profileren.
    Antibacterial activity of reactive quaternary ammonium compounds in solution and in nonleachable coatings
    Gozzelino, G. ; Romero Tobar, D.E. ; Chaitiemwong, N. ; Hazeleger, W.C. ; Beumer, R.R. - \ 2011
    Journal of Food Protection 74 (2011)12. - ISSN 0362-028X - p. 2107 - 2112.
    antimicrobial activity - polymer surfaces - bacteria - nanoparticles - additives - water
    Antibacterial polymers suitable for coating applications without leaching of the biocidal component have been obtained by UV copolymerization of acrylic resins with acrylic monomers containing quaternary ammonium moieties. Suitable reactive biocides, based on quaternary ammonium monomers (QAMs), endowed with undecylacryloyl group and alkyl chains with 2 (QAM-C2), 8 (QAM-C8), and 16 (QAM-C16) carbon atoms have been synthesized. Aqueous solutions of QAMs showed biocidal activity against Escherichia coli, Staphylococcus aureus, and Listeria monocytogenes strains both in suspension and adhered to stainless steel surfaces. QAM-C16 and QAM-C8 evidenced higher activity toward bacteria in suspension and on stainless steel, respectively. The QAMs have shown sufficient reactivity to be copolymerized, by UV irradiation, with a commercial urethane acrylic resin for coating. Bioactivity tests, performed on free films of crosslinked coatings containing 1% of copolymerized QAM, have shown an increasing inactivation effect in the order of magnitude L. monocytogenes, E. coli, S. aureus with a maximum activity of the QAM-C8
    Stability of fatty acids during wilting of perennial ryegrass (Lolium perenne L.): effect of bruising and environmental conditions
    Khan, N.A. ; Cone, J.W. ; Fievez, V. ; Hendriks, W.H. - \ 2011
    Journal of the Science of Food and Agriculture 91 (2011)9. - ISSN 0022-5142 - p. 1659 - 1665.
    light-dependent degradation - cutting date - lipid-metabolism - senescence - cultivar - forages - silage - additives - pigments - interval
    BACKGROUND: Oxidation of fatty acids (FA) during field wilting of herbage could cause extensive losses of polyunsaturated FA. Recent studies showed a variable effect of wilting on the losses of FA. This suggests that environment and management conditions influence the loss of FA during wilting. The present study investigated the stability of FA in untreated and mechanically bruised perennial ryegrass, wilted under field conditions for 0, 12, 24, 36 and 48 h, or wilted under controlled climate conditions at three temperatures (15, 25 or 35 °C) and two light (dark or light) regimes to dry matter (DM) contents of 425, 525 or 625 g kg-1. RESULTS: During 48 h of field wilting, the total FA content declined (15.2 to 11.9 g kg-1 DM) consistently, despite an increase in herbage DM content (197 to 676 g kg-1). Under controlled climate conditions, the herbage total FA content declined (15.1 to 11.7 g kg-1 DM) mainly during the prolonged (56 to 62 h) initial drying to a DM content of 425 g kg-1 and did not decline with further drying to DM contents of 525 and 625 g kg-1. The decline in total FA was associated with a parallel decline in C18:3 content under field (9.15 to 6.36 g kg-1 DM) and controlled (9.12 to 6.15 g kg-1 DM) conditions. Concomitantly, the proportion of C18:3 in total FA decreased, whilst the proportion of C16:0 and C18:0 increased. Lower losses of FA (P <0.05) were observed at 15 °C compared to 25 and 35 °C. Light did not affect the losses of FA during wilting. CONCLUSIONS: The duration of the wilting period mainly affected the changes in FA content and composition. Stability of FA in herbage could be increased by minimising the duration of wilting.
    Effect of ammonia in cigarette tobacco on nicotine absorption in human smokers
    Amsterdam, J. van; Sleijffers, A. ; Spiegel, P. van; Blom, R. ; Witte, M. ; Kassteele, J. van de; Blokland, M.H. ; Steerenberg, P. ; Opperhuizen, A. - \ 2011
    Food and Chemical Toxicology 49 (2011)12. - ISSN 0278-6915 - p. 3025 - 3030.
    respiratory-tract - oral-mucosa - smoking - deposition - retention - ph - permeation - additives - exposure - delivery
    The function of ammonia as tobacco additive is subject of scientific debate. It is argued that ammonia, by increasing the proportion of free nicotine, increases the absorption of nicotine in smokers. As a result of the addition of ammonia to cigarettes, smokers get exposed to higher internal nicotine doses and become more addicted to the product. On two occasions, the nicotine absorption in blood was measured after smoking a commercial cigarette of either brand 1 or brand 2, which differed 3.8-fold in ammonium salt content. Using a standardized smoking regime (six puffs, 30 s puff interval, 7 s breath hold before exhalation), 51 regular smokers smoked brand 1 (Caballero Smooth Flavor; 0.89 mg ammonium per gram tobacco) and brand 2 (Gauloise Brunes; 3.43 mg ammonium per gram tobacco). Puff volumes and cardiovascular parameters were monitored during and following smoking, respectively. Measurement of serum nicotine level in the blood samples collected over time following smoking of the two brands, showed that total amount of nicotine absorbed did not differ between the two brands. Present results demonstrate that smoking tobacco containing a higher amount of the tobacco additive ammonium does not increase the absorption of nicotine in the smoker’s body.
    I. Technical assessment for first generation green biorefinery (GBR) using mass and energy balances: Scenarios for an Irish GBR blueprint
    O'Keeffe, S. ; Schulte, R.P.O. ; Sanders, J.P.M. ; Struik, P.C. - \ 2011
    Biomass and Bioenergy 35 (2011)1. - ISSN 0961-9534 - p. 4712 - 4723.
    silage effluent - grass-silage - aerobic treatment - finishing pigs - biomass - fermentation - additives - cattle - acid - diet
    “Green biorefinery” (GBR) could be an alternative option for using grassland biomass. GBR involves applying technology to chemically and physically fractionate (split) biomass such as grass and grass silage into marketable products. From the grass fibre fraction insulation materials can be produced. From the grass juice fraction, proteinaceous products for animal feed and lactic acid (LA) for plastic production (polylactic acid – PLA) can be produced. This paper is the first part in the analysis to develop a blueprint for a first generation Irish GBR system. The focus of this paper is on the technical aspects of developing three GBR system models and subsequent scenario analyses. The three GBR system models were a combination of feedstock system and biorefinery technology; Grass/silage–basic technology (GS), Silage–basic technology (S) and Silage–High Tech (AT). The models, which were integrated mass and energy balances, were then assessed at the three different input volumes, to generate nine scenarios. The scenarios which required further economic analysis in a companion paper to determine their overall feasibility (technical and economic) in the development of blueprint for a first generation Irish GBR system were identified. From the technical analysis outlined in this paper six scenarios were identified which require further economic analysis. These were scenarios generated for the GS, S and AT GBR systems, at two input volume rates
    De functionele eigenschappen van suiker : de rol van suiker
    Boekel, M.A.J.S. van - \ 2010
    Voeding en Visie 2010 (2010)1. - ISSN 0924-3267 - p. 3 - 4.
    suiker - toevoegingen - voedseladditieven - smaak - zoetstoffen - sugar - additives - food additives - taste - sweeteners
    Suiker kan om veel verschillende redenen aan voeding worden toegevoegd. Om de zoete smaak natuurlijk, maar er is meer. Professor Tiny van Boekel van Wageningen Universiteit legt uit waarom suiker zo uniek is.
    Iedereen eet en drinkt elke dag voedsel met E-nummers
    Hartemink, R. - \ 2010
    Over gevoelig heden : kwartaalblad van de Stichting Voedselallergie 26 (2010)4. - ISSN 0928-9127 - p. 22 - 24.
    voedseladditieven - voedselallergieën - voedselintolerantie - stoornissen samenhangend met voedsel - toevoegingen - etiketteren van voedingsmiddelen - voedselsamenstelling - voeding en gezondheid - food additives - food allergies - food intolerance - food-related disorders - additives - nutrition labeling - food composition - nutrition and health
    Soms krijgen mensen met overgevoeligheidsklachten het advies om alle E-nummers in levensmiddelen te mijden. Dat kan helemaal niet! 'Als je dat wilt doen, hou je een dieet over van water, zout en suiker', aldus levensmiddelentechnoloog dr. ir. Ralf Hartemink van Wageningen Universiteit. Dit artikel is een bewerking van zijn lezing tijdens de LustrumDag.
    Focus bij substraat van ziekteverwekkers naar 'gezondmakers' verleggen
    Kierkels, T. ; Wurff, A.W.G. van der; Blok, C. ; Heuvelink, E. - \ 2010
    Onder Glas 7 (2010)11. - p. 15 - 17.
    cultuur zonder grond - substraten - micro-organismen - nuttige organismen - toevoegingen - bodemvruchtbaarheid - verbeteraars - tuinbouw - bodemweerbaarheid - glastuinbouw - soilless culture - substrates - microorganisms - beneficial organisms - additives - soil fertility - amendments - horticulture - soil suppressiveness - greenhouse horticulture
    Ooit was het idee dat substraat vrijwel steriel is. Maar het tegendeel is het geval: per gram komen miljoenen, zo niet miljarden organismen voor. Dan kun je daar maar beter je voordeel mee doen. Het bodemleven bevordert de productie, de kwaliteit en beschermt tegen ziekten. Klein probleem: we weten er nog verschrikkelijk weinig van. Mogelijke beïnvloedingsmethoden liggen in het toevoegen van nuttige organismen of het sturen van het hele ecosysteem in het substraat.
    Modelling ion composition in simulated milk ultrafiltrate (SMUF). I: Influence of calcium phosphate precipitation.
    Gao, R. ; Halsema, F.E.D. van; Temminghoff, E.J.M. ; Leeuwen, H.P. van; Valenberg, H.J.F. van; Eisner, M.D. ; Giesbers, M. ; Boekel, M.A.J.S. van - \ 2010
    Food Chemistry 122 (2010)3. - ISSN 0308-8146 - p. 700 - 709.
    donnan membrane technique - salt solution - ph - 50-degrees-c - equilibria - speciation - additives
    Freshly prepared simulated milk ultrafiltrate (SMUF) is a solution that is supersaturated with respect to various calcium phosphate phases that precipitate in time. As a consequence, the ion composition of equilibrated SMUF was found to be significantly different from that of freshly prepared SMUF. This study proposes a thermodynamic ion-speciation model that is able to describe ion equilibria in SMUF. Moreover, it is also able to describe calcium phosphate precipitation in fresh SMUF on its way to equilibrium by using an apparent solubility product for CaHPO4·2H2O as a function of time. The model was validated by experiments in which CaCl2 and Na2HPO4 were added to freshly prepared SMUF. The changes in calcium activity and pH were followed and the precipitates were characterised by X-ray diffraction. The model was able to predict the observed changes
    Effecten van Economic op de werking van Roundup Evolution en MCPA op onkruiden onder kasomstandigheden
    Kempenaar, C. ; Uffing, A.J.M. - \ 2010
    Wageningen : Plant Research International (Nota / Plant Research International 660) - 18
    hulpstoffen - doseringseffecten - milieueffect - toevoegingen - glyfosaat - mcpa - landbouw en milieu - adjuvants - dosage effects - environmental impact - additives - glyphosate - mcpa - agriculture and environment
    Milieuvriendelijke stoffen kunnen het verbruik aan herbiciden op verhardingen in Nederland en daarbuiten verminderen. In 2009 werden vjif wetenschappelijke proeven uitgevoerd waarin onderzocht werd of de hulpstof Economic de effictiviteit van de herbiciden Roundup Evolution en MCPA vergroot. Economic is een hulpstof op basis van plantaardige olie die volgens de producent de opname van herbiciden door planten vergroot.
    Zout tegen minder roest in asperge
    Evenhuis, A. ; Wilms, J.A.M. - \ 2009
    Groenten en Fruit. Algemeen 2009 (2009)31. - ISSN 0925-9694 - p. 33 - 33.
    tuinbouwbedrijven - proefbedrijven - asparagus - grondbewerking - toevoegingen - zout - roestziekten - aanaarden - ruggen - market gardens - pilot farms - asparagus - tillage - additives - salt - rust diseases - earthing up - ridges
    Met of zonder toevoeging van zout de grond bewerken kan roest in asperge verminderen. Dat concludeert PPO Vredepeel in een tussenbalans na twee jaar onderzoek. De ideale aanpak lijkt per bedrijf te verschillen
    A randomised controlled trial into the effects of food and ADHD
    Pelsser, L. ; Frankena, K. ; Toorman, J. ; Savelkoul, H.F.J. ; Rodrigues Pereira, R. ; Buitelaar, J. - \ 2009
    European Child & Adolescent Psychiatry 18 (2009)1. - ISSN 1018-8827 - p. 12 - 19.
    attention-deficit/hyperactivity disorder - cognitive-behavior therapy - chronic-fatigue-syndrome - oligoantigenic diet - hyperactive boys - double-blind - children - additives - adolescents - multicenter
    The aim of this study is to assess the efficacy of a restricted elimination diet in reducing symptoms in an unselected group of children with Attention deficit/hyperactivity disorder (ADHD). Dietary studies have already shown evidence of efficacy in selected subgroups. Twenty-seven children (mean age 6.2) who all met the DSM-IV criteria for ADHD, were assigned randomly to either an intervention group (15/27) or a waiting-list control group (12/27). Primary endpoint was the clinical response, i.e. a decrease in the symptom scores by 50% or more, at week 9 based on parent and teacher ratings on the abbreviated ten-item Conners Scale and the ADHD-DSM-IV Rating Scale. The intention-to-treat analysis showed that the number of clinical responders in the intervention group was significantly larger than that in the control group [parent ratings 11/15 (73%) versus 0/12 (0%); teacher ratings, 7/10 (70%) versus 0/7 (0%)]. The Number of ADHD criteria on the ADHD Rating Scale showed an effect size of 2.1 (cohen¿s d) and a scale reduction of 69.4%. Comorbid symptoms of oppositional defiant disorder also showed a significantly greater decrease in the intervention group than it did in the control group (cohens¿s d 1.1, scale reduction 45.3%). A strictly supervised elimination diet may be a valuable instrument in testing young children with ADHD on whether dietary factors may contribute to the manifestation of the disorder and may have a beneficial effect on the children¿s behaviour.
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