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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    Voorkomen vochtschokken beste remedie om bladrandjes te vermijden
    Voogt, Wim - \ 2016
    horticulture - greenhouse horticulture - vegetables - tomatoes - plant disorders - calcium absorption - nutrient accounting system - chlorine - iron - climatic factors - illumination - nutrient solutions - moisture - agricultural research
    Ecotoxicological effects and DPB-formation in water treated with SDCC-derived chlorine
    Kaag, N.H.B.M. ; Sneekes, A.C. - \ 2016
    IMARES (Report / IMARES C079/16) - 25
    ecotoxicology - chlorine - disinfectants - water - ecotoxicologie - chloor - ontsmettingsmiddelen - water
    Ontsmettingsmiddel niet altijd getest op effect in plantaardige teelten : toevoeging aan druppelwater of complete installatie
    Stijger, Ineke ; Os, Erik van - \ 2016
    horticulture - greenhouse horticulture - disinfectants - nutrient solutions - trickle irrigation - disinfection - effects - adverse effects - chlorine - hydrogen peroxide - irrigation water - plant viruses - recirculating systems

    Een vertegenwoordiger rijdt het erf op, doet zijn kofferbak open en prijst een willekeurig ontsmettingsmiddel aan. Het gebeurt regelmatig, weten Wageningen UR onderzoekers Ineke Stijger en Erik van Os te vertellen. En er zijn nog steeds telers die de verkopers op hun woord geloven. “Niet veel later hebben wij ze aan de telefoon met de vraag waarom het water toch niet voldoende schoon is.” De onderzoekers roepen telers daarom op kritisch te blijven kijken naar nieuwe middelen en technieken. “Geloof de werking pas als die via onafhankelijk onderzoek is bewezen.”

    Uitspoeling van zouten in een kasgrond: Onderzoek aan uitspoeling aan grondkolommen met natriumchloride- en natriumsulfaattoediening
    Voogt, W. ; Steenhuizen, J.W. ; Winkel, A. van; Bosch, C.J.W. - \ 2013
    Bleiswijk : Wageningen UR Glastuinbouw (Rapporten WUR GTB 1260) - 40
    kassen - bodemonderzoek - percolatie - zouten - natrium - chloor - laboratoriumproeven - irrigatie - meting - uitspoelen - glastuinbouw - greenhouses - soil testing - percolation - salts - sodium - chlorine - laboratory tests - irrigation - measurement - leaching - greenhouse horticulture
    Dit onderzoek is gefinancierd door het Ministerie van Economische Zaken, in het kader van het BO programma “Biologische Landbouw/thema Duurkas” en “Duurzame bodem”
    Sodium hypochlorite: A promising agent for reducing Botrytis cinerea infection on rose flowers
    Macnish, A.J. ; Morris, K.L. ; Theije, A. de; Mensink, M.G.J. ; Boerrigter, H.A.M. ; Reid, M.S. ; Jiang, C.Z. ; Woltering, E.J. - \ 2010
    Postharvest Biology and Technology 58 (2010)3. - ISSN 0925-5214 - p. 262 - 267.
    cut roses - chlorine - conidia - preharvest - resistance - bacteria - humidity - disease - mold
    Botrytis cinerea is a fungal pathogen that greatly reduces the postharvest quality of rose flowers. A postharvest dip in 200 µL L-1 sodium hypochlorite (NaOCl) for 10 s at 20 °C provided the greatest control of B. cinerea on ‘Akito’ and ‘Gold Strike’ flowers. NaOCl derived from Clorox® Ultra household bleach solution was more effective than laboratory grade NaOCl in reducing disease symptoms. Lowering the pH of the NaOCl solution from pH 9.7 (unadjusted) to pH 7.0 greatly improved its efficacy. Treating ‘Gold Strike’ flowers in this pH-adjusted NaOCl solution was more effective in reducing the level of infection on petals than postharvest dips in the conventional fungicides Medallion®, Phyton®, Switch® and Vangard®. Applying NaOCl prior to a 3- or 10-d commercial shipment also provided the most consistent disease control for a wide range of rose cultivars as compared to conventional fungicides. Of particular interest, the efficacy of NaOCl and Phyton® was greatest when these compounds were applied to ‘Gold Strike’ flowers after incubation at 20 °C and 90% RH for 6–9 h. Our findings highlight NaOCl as a promising new candidate for the control of B. cinerea on rose flowers.
    Chloor blijkt wondermiddel tegen rozenziekte
    Sikkema, A. - \ 2010
    Resource: weekblad voor Wageningen UR 5 (2010)3. - ISSN 1874-3625 - p. 10 - 10.
    chloor - rozen - botrytis cinerea - schimmelbestrijding - gewasbescherming - chlorine - roses - botrytis cinerea - fungus control - plant protection
    Chloor blijkt een uitstekend middel te zijn tegen een belangrijke ziekteverwekker in rozen, de schimmel Botrytis cinerea. Dit is per toeval ontdekt toen wetenschappers een chlooroplossing als controlemiddel gebruikten. Het controlemiddel bleek beter te werken dan de andere middelen.
    Alternatieven voor reinigen van melkwinningsinstallaties zonder chloor = Alternatives for cleaning of milking equipment without chloride
    Slaghuis, B.A. ; Verstappen-Boerekamp, J.A.M. - \ 2008
    Wageningen : Animal Sciences Group (Rapport / Animal Sciences Group nr. 98) - 15
    melkveehouderij - melk- en zuivelapparatuur - melkmachines - reiniging - melkkoelers - melktanks - chloor - ontsmettingsmiddelen - toegepast onderzoek - alternatieve methoden - dairy farming - dairy equipment - milking machines - clearing - milk coolers - milk tanks - chlorine - disinfectants - applied research - alternative methods
    Een goede reiniging van de melkinstallatie is een voorwaarde voor het kunnen afleveren van rauwe melk van de hoogste kwaliteitsniveaus. In Nederland wordt vaak gebruik gemaakt van gecombineerde reiniging- en desinfectiemiddelen. Hierin wordt meestal chloor toegepast. Het gebruik van chloor staat in het algemeen onder druk en ook in de melkwinning zoekt men naar alternatieven. Een van de vraagtekens bij het gebruik van reinigingsmiddelen zonder chloor betreft de effectiviteit. Reinigt het middel even goed als de gebruikelijke middelen met chloor? Deze vraag was aanleiding voor de Nederlandse Zuivel Organisatie NZO om ASG Veehouderij te vragen een onderzoek op te starten naar de effectiviteit van dergelijke middelen
    CprK crystal structures reveal mechanism for transcriptional control of halorespiration
    Joyce, M.G. ; Levy, C. ; Gabor, K. ; Pop, S.M. ; Biehl, B.D. ; Doukov, T.I. ; Ryter, J.M. ; Mazon, H. ; Smidt, H. ; Heuvel, R.H.H. van den; Ragsdale, S.W. ; Oost, J. van der; Leys, D. - \ 2006
    Journal of Biological Chemistry 281 (2006)38. - ISSN 0021-9258 - p. 28318 - 28325.
    nucleotide-gated channels - camp receptor protein - desulfitobacterium-dehalogenans - dna-binding - escherichia-coli - purification - refinement - activation - regulator - chlorine
    Halorespiration is a bacterial respiratory process in which haloorganic compounds act as terminal electron acceptors. This process is controlled at transcriptional level by CprK, a member of the ubiquitous CRP-FNR family. Here we present the crystal structures of oxidized CprK in presence of the ligand ortho-chlorophenolacetic acid and of reduced CprK in absence of this ligand. These structures reveal that highly specific binding of chlorinated, rather than the corresponding non-chlorinated, phenolic compounds in the NH 2-terminal ß-barrels causes reorientation of these domains with respect to the central ¿-helix at the dimer interface. Unexpectedly, the COOH-terminal DNA-binding domains dimerize in the non-DNA binding state. We postulate the ligand-induced conformational change allows formation of interdomain contacts that disrupt the DNA domain dimer interface and leads to repositioning of the helix-turn-helix motifs. These structures provide a structural framework for further studies on transcriptional control by CRP-FNR homologs in general and of halorespiration regulation by CprK in particular
    Future trends in transport and fate of diffuse contaminants in catchments, with special emphasis on stable isotope applications
    Turner, J. ; Albrechtsen, H.J. ; Bonell, M. ; Duguet, J.P. ; Harris, B. ; Meckenstock, R. ; McGuire, K. ; Moussa, R. ; Peters, N. ; Richnow, H.H. ; Sherwood-Lollar, B. ; Uhlenbrook, S. ; Lanen, H.A.J. van - \ 2006
    Hydrological Processes 20 (2006)1. - ISSN 0885-6087 - p. 205 - 213.
    carbon - biodegradation - fractionation - groundwater - chlorine - basin
    A summary is provided of the first of a series of proposed Integrated Science Initiative workshops supported by the UNESCO International Hydrological Programme. The workshop brought together hydrologists, environmental chemists, microbiologists, stable isotope specialists and natural resource managers with the purpose of communicating new ideas on ways to assess microbial degradation processes and reactive transport at catchment scales. The focus was on diffuse contamination at catchment scales and the application of compound-specific isotope analysis (CSIA) in the assessment of biological degradation processes of agrochemicals. Major outcomes were identifying the linkage between water residence time distribution and rates of contaminant degradation, identifying the need for better information on compound specific microbial degradation isotope fractionation factors and the potential of CSIA in identifying key degradative processes. In the natural resource management context, a framework was developed where CSIA techniques were identified as practically unique in their capacity to serve as distributed integrating indicators of process across a range of scales (micro to diffuse) of relevance to the problem of diffuse pollution assessment.
    Designing the optimal robotic milking barn by applying a queuing network approach
    Halachmi, I. ; Adan, I.J.B.F. ; Wald, J. van der; Beek, P. van; Heesterbeek, J.A.P. - \ 2003
    Agricultural Systems 76 (2003)2. - ISSN 0308-521X - p. 681 - 696.
    dairy-cows - social hierarchy - system - behavior - metabolism - water - potassium - lactation - chlorine - queues
    The design of various conventional dairy barns is based on centuries of experience, but there is hardly any experience with robotic milking barns (RMB). Furthermore, as each farmer has his own management practices, the optimal layout is `site dependent¿. A new universally applicable design methodology has been developed, to overcome this lack of experience with RMBs and to facilitate the designing of their optimal layout. This model for optimizing facility allocation, based on cow behaviour, welfare needs, and facility utilization, uses queuing network theory, Markov process, and heuristic optimization. The methodology has been programmed into a software application, supporting the design process. On a particular farm, presented later as a case study, numerical results include: if the herd contains more than 50 cows, the forage-lane utilization is greater than 70% (or idle time is less than 30%). To meet animal-welfare demands, the herd size should not exceed 60 cows. Therefore, the herd should comprise 50¿60 cows. In the second scenario examined, the average robot idle time was 25%, queue length was three cows, and each cow waited for about 3 min at the robot. It is still uncommon to apply techniques from queuing-network theory to livestock housing, and this study demonstrates their potential as practical design tools that meet both economic and animal welfare needs.
    Milieubeleid in een veranderende context: zes voorbeelden
    Bouma, J. ; Burgers, J. ; Butter, F.A.G. den; Hoefnagel, F. ; Hond, F. den - \ 2003
    Den Haag : WRR (Werkdocumenten / Wetenschappelijke Raad voor het Regeringsbeleid W134) - ISBN 9789059590113 - 196
    milieubeleid - luchtverontreiniging - klimaatverandering - luchthavens - vogels - stikstof - chloor - nederland - environmental policy - air pollution - climatic change - airports - birds - nitrogen - chlorine - netherlands
    The potential of anaerobic bacteria to degrade chlorinated compounds
    Eekert, M.H.A. van; Schraa, G. - \ 2001
    Water Science and Technology 44 (2001). - ISSN 0273-1223 - p. 49 - 56.
    afvalwaterbehandeling - chloor - verwijdering - anaërobe micro-organismen - bacteriën - anaërobe afbraak - waste water treatment - chlorine - removal - anaerobes - bacteria - anaerobic digestion
    De invloed van sulfaat en chloride op de fosfaatbeschikbaarheid in veenbodem, een bijdrage aan integraal waterbeheer.
    Beltman, B. ; Krift, T. van der - \ 1997
    H2O : tijdschrift voor watervoorziening en afvalwaterbehandeling 1 (1997). - ISSN 0166-8439 - p. 19 - 22.
    hoogveengronden - kanalen - chloor - hydrologie - veengronden - fosfor - rivieren - bodem - waterlopen - sulfaten - oppervlaktewater - moerasgronden - water - waterbeheer - waterverontreiniging - waterkwaliteit - watervoorziening - utrecht - bog soils - canals - chlorine - hydrology - peat soils - phosphorus - rivers - soil - streams - sulfates - surface water - swamp soils - water - water management - water pollution - water quality - water supply - utrecht
    Effect van OEB- en NaCl-gehalte in het rantsoen op de uitscheiding van water, stikstof, natrium, kalium, chloor en stikstofcomponenten in urine van melkkoeien
    Vuuren, A.M. van - \ 1996
    Lelystad : ID-DLO (Rapport / ID-DLO no. 96.008) - 34
    melkvee - diervoedering - urine - secretie - water - stikstof - natrium - kalium - chloor - fysiologie - dairy cattle - animal feeding - urine - secretion - water - nitrogen - sodium - potassium - chlorine - physiology
    Het nitraatgehalte van sla op voedingsfilm
    Boon, J. van der; Steenhuizen, J.W. - \ 1984
    Haren (Gr.) : I.B. (Rapport / Instituut voor Bodemvruchtbaarheid no. 13-84,1-85,16-85,6-86,5-,8-,11-87)
    chemische samenstelling - planten - chemische analyse - lactuca sativa - slasoorten - hydrocultuur - voedingsfilmsysteem - bodem - elektrische eigenschappen - elektrische geleiding - magnetische eigenschappen - calcium - vloeibare kunstmeststoffen - nitraten - stikstofmeststoffen - magnesium - chloor - glastuinbouw - chemical composition - plants - chemical analysis - lactuca sativa - lettuces - hydroponics - nutrient film techniques - soil - electrical properties - electrical conductance - magnetic properties - calcium - liquid fertilizers - nitrates - nitrogen fertilizers - magnesium - chlorine - greenhouse horticulture
    Calciumchloride vermindert bladverbranding bij 'Pirate'
    Berghoef, J. ; Elzinga, P. - \ 1982
    Vakblad voor de Bloemisterij 37 (1982)11. - ISSN 0042-2223 - p. 32 - 33.
    calcium - chloor - oogstschade - cultivars - liliaceae - sierplanten - plaatsing (van meststoffen) - rassen (taxonomisch) - zonnebrand (sunscald) - rassen (planten) - chlorine - crop damage - ornamental plants - placement - races - sunscald - varieties
    Gebleken is dat herhaalde bespuitingen met 1% calciumchloride de bladverbranding bij deze leliecultivar aanzienlijk kunnen verminderen
    Het ontstaan van trihalomethanen bij de behandeling van drinkwater met chloor
    Rook, J.J. - \ 1978
    Landbouwhogeschool Wageningen. Promotor(en): P.G. Fohr, co-promotor(en): H.C. van der Plas. - Wageningen : [s.n.] - 170
    water - chemische behandeling - desinfectie - chloor - water - chemical treatment - disinfection - chlorine
    It has been established that chlorination of naturally coloured waters produces chloroform and other trihalomethanes in concentrations that are considerably higher than most of the organic microcontaminants commonly found in polluted surface waters.

    The objective of this study was to investigate the origin of the trihalomethanes in drinking water and the mechanism responsible for their formation. Chapter 1 gives a historical survey of the use of chlorine in drinking water treatment. The main application of chlorine originally was disinfection. Soon after, chlorination became common practice for the oxidative removal of earthy tastes and odors. Additionally the bleaching of naturally coloured water was found to be advantageous.

    As a result of studies of the various reactions between chlorine and inorganic ammonium the breakpoint phenomenon was discovered in 1940. Since then breakpoint chlorination is used for quantitative removal of ammonium from raw water. Until that time alternate methods of removal included biological means such as slow sand filtration. Breakpoint chlorination led to the development of water purification methods that could be accomplished by entirely physico-chemical treatment.

    However, as the levels of pollution of river Rhine water increased, the experience in Rotterdam was that breakpoint chlorination became less and less effective. Additionally the taste was adversely affected. In 1965 gaschromatography was applied in an attempt to determine the reaction products responsible for the taste problem.

    Chapter 2 describes the development in our laboratory of a modified headspace vapour analysis method for water. This allowed for the capture of minute amounts of volatile organics before and after chlorination of the river water. The technique basically is a static method in which a gas volume (headspace) is brought into equilibrium with the water sample. The headspace gas is collected on a cold trapping column which contains the same adsorbent as used for the stationary phase in the subsequent gaschromatographic separation. Using this technique for drinking water four large peaks were found which were not present in the untreated water. The four compounds were identified with chloroform, dichloro-bromomethane, chloro-dibromomethane and bromoform.

    Chapter 3 gives the analytical data obtained from Rotterdam drinking water, first prepared from river Rhine and later from river Meuse. Surprisingly the same four haloforms were found after chlorination of both waters.

    It was analytically established that the chlorine gas didnot contain trihalomethanes. Neither did it contain bromine in detectable amounts, i.e. less than 100 mg/kg.

    In an investigation of natural waters chloroform formation was found to occur after chlorination of samples from several unpolluted ponds and. lakes. Those that contained bromide-ions in concentrations higher thans 0.1 mg/l also gave the brominated trihalomethanes. I

    t was suspected that both the organic precursor for chloroform and the inorganic precursor for the brominated compounds were present in all types of natural waters. Chlorination resulted in the oxidation of Br -to HBrO, which in turn is known to react as a halogenating agent.

    Chapter 4: Since the major soluble organic compounds in natural waters are humic substances - mainly fulvic acids - it was logical to assume that they are the organic precursor. Humic acids contain both carboxylic and phenolic functionalities. Polyphenols are known to make up for the bulk of the degradation products of humic acids. Furthermore several polyhydroxybenzenes are known to give the iodoform reaction. The combination of the latter two facts led to the theory that polyphenolic structures in the humic acid matrix are the reactive sites from which chloroform is formed. To prove this, the principle experiment consisted of chlorination of peat extracts and aqueous solutions of commercial humic acids. Both solutions gave chloroform when treated with chlorine. Addition of inorganic bromide before chlorination resulted in the formation of all four haloforms.

    Chapter 5 involves an investigation of the specific type of polyhydroxybenzene responsible for chloroform-formation. Compounds in which two hydroxy-groups are in the meta-position gave the highest yields of chloroform.

    We also found that in the methylethers of resorcinol and phloroglucinol the formation of chloroform is suppressed. This led to the theory that the phenoxide-ion is essential for the formation of the halogenated mono-carbon degradation product.

    It is a reasonable assumption that in the competetive oxidation and substitution reactions the aromatic nucleus is destroyed to give an alpha-chlorinated ketone. A reaction mechanism is proposed in which the carbon atom in between two meta-positioned OH-groups is chlorinated twice. This is followed by scission into a linear alpha-ketone. This intermediate is further chlorinated to RCCl 3 according to the pathways known to occur in the haloform reaction.

    In chapter 6 cursory pilot plant studies focused on removal of chloroform by adsorption on activated carbon are described. It was found that the adsorptive capacity of carbon for chloroform was too low to be of interest. Further investigation aimed at the removal of the fulvic acids which are the precursor for the trihalomethanes. Pre-ozonation was tried but had little effect.

    Some experimental results with macroporous ion exchance resins appear effective in removing a major portion of the precursor for the haloformformation.

    Uitspoeling van chloor uit kasgronden
    Willigen, P. de - \ 1975
    Haren : Instituut voor Bodemvruchtbaarheid (Nota / Instituut voor Bodemvruchtbaarheid no. 18) - 19
    uitspoelen - zoute gronden - chloor - glastuinbouw - leaching - saline soils - chlorine - greenhouse horticulture
    Het chloridegehalte van het grondwater in Midden-West-Nederland
    Rees Vellinga, E. van; Toussaint, C.G. ; Gils, J.B.H.M. van - \ 1972
    Wageningen : I.C.W. (Nota / Instituut voor Cultuurtechniek en Waterhuishouding 695) - 8
    grondwater - chemische eigenschappen - chloor - west-nederland - groundwater - chemical properties - chlorine - west netherlands
    Chloor - effect bij tabaksteelt
    Anonymous, - \ 1967
    Wageningen : [s.n.] (Literatuurlijst / Centrum voor landbouwpublikaties en landbouwdocumentatie no. 2879)
    bibliografieën - plantkunde - kunstmeststoffen - mest - nicotiana - prestatieniveau - plantenziekten - afwijkingen, planten - plantenvoeding - plantenziektekunde - plantenplagen - gewasbescherming - kwaliteit - tabak - chloor - bibliographies - botany - fertilizers - manures - performance - plant diseases - plant disorders - plant nutrition - plant pathology - plant pests - plant protection - quality - tobacco - chlorine
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