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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    We will mail you new results for this query: wurpublikatie/titelbeschrijving/classificatie/trefwoord/cab/engels==instruments
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Instructievideo Cuvet
Bom, Jesse ; Dijksman, J.A. ; Lageschaar, Luuk ; Galen, Martijn van; Hoogendam, C.W. ; Wegh, R.A.J. - \ 2016
Wageningen : Wageningen UR
meetinstrumenten - instrumenten (meters) - absorptiegraad - indicating instruments - instruments - absorbance
Instructievideo over het gebruik van een cuvet
Conductometer Schott
Bom, Jesse ; Dijksman, J.A. ; Lageschaar, Luuk ; Galen, Martijn van; Hoogendam, C.W. ; Wegh, R.A.J. - \ 2016
Wageningen : Wageningen UR
geleidingsvermogen - instrumenten (meters) - meetinstrumenten - chemie - conductivity - instruments - indicating instruments - chemistry
Instructievideo over het gebruik van de Schott Conductometer
Kalibratie pH meter Inolab
Bom, Jesse ; Dijksman, J.A. ; Lageschaar, Luuk ; Galen, Martijn van; Hoogendam, C.W. ; Wegh, R.A.J. - \ 2016
Wageningen : Wageningen UR
ph - zuurgraad - meetinstrumenten - instrumenten (meters) - kalibratie - acidity - indicating instruments - instruments - calibration
Instructievideo over de kalibratie van de InoLab pH meter
pH meter Inolab
Bom, Jesse ; Dijksman, J.A. ; Lageschaar, Luuk ; Galen, Martijn van; Hoogendam, C.W. ; Wegh, R.A.J. - \ 2016
Wageningen : Wageningen UR
ph - zuurgraad - instrumenten (meters) - meetinstrumenten - acidity - instruments - indicating instruments
Instructievideo over het gebruik van de Inolab pH meter
Spectrofotometer VWR
Bom, Jesse ; Dijksman, J.A. ; Lageschaar, Luuk ; Galen, Martijn van; Hoogendam, C.W. ; Wegh, R.A.J. - \ 2016
Wageningen : Wageningen UR
absorptiegraad - meetinstrumenten - instrumenten (meters) - optische instrumenten - spectra - absorbance - indicating instruments - instruments - optical instruments
Instructievideo over het gebruik van de VWR spectofotometer
Spectrofotometer LKB
Bom, Jesse ; Dijksman, J.A. ; Lageschaar, Luuk ; Galen, Martijn van; Hoogendam, C.W. ; Wegh, R.A.J. - \ 2016
Wageningen : Wageningen UR
spectra - absorptiegraad - instrumenten (meters) - meetinstrumenten - absorbance - instruments - indicating instruments
Instructievideo over het gebruik van de LKB Spectofotometer
Metrohm Buret
Bom, Jesse ; Dijksman, J.A. ; Lageschaar, Luuk ; Galen, Martijn van; Hoogendam, C.W. ; Wegh, R.A.J. - \ 2016
Wageningen : Wageningen UR
titratie - chemie - instrumenten (meters) - titration - chemistry - instruments
Instructievideo over het gebruik van de Metrohm Buret
Kalibratie pH meter Schott
Bom, Jesse ; Dijksman, J.A. ; Lageschaar, Luuk ; Galen, Martijn van; Hoogendam, C.W. ; Wegh, R.A.J. - \ 2016
Wageningen : Wageningen UR
ph - zuurgraad - meetinstrumenten - instrumenten (meters) - kalibratie - acidity - indicating instruments - instruments - calibration
Instructievideo over de kalibratie van de Schott pH meter
Beehold : the colony of the honeybee (Apis mellifera L) as a bio-sampler for pollutants and plant pathogens
Steen, J.J.M. van der - \ 2016
University. Promotor(en): Huub Rijnaarts, co-promotor(en): Tim Grotenhuis; Willem Jan de Kogel. - Wageningen : Wageningen University - ISBN 9789462577510 - 206 p.
apis mellifera - honey bees - honey bee colonies - biological indicators - sampling - instruments - pollution - pollutants - heavy metals - plant pathogenic bacteria - erwinia amylovora - erwinia pyrifoliae - analytical methods - honingbijen - honingbijkolonies - biologische indicatoren - bemonsteren - instrumenten (meters) - verontreiniging - verontreinigende stoffen - zware metalen - plantenziekteverwekkende bacteriën - analytische methoden

Bio-sampling is a function of bio-indication. Bio-indication with honeybee colonies (Apis mellifera L) is where the research fields of environmental technology and apiculture overlap. The honeybees are samplers of the environment by collecting unintentionally and simultaneously, along with nectar, pollen, water and honeydew from the flowers or on the leaves, other matter (in bio-indication terms: target matter) and accumulating this in the colony. Collected target matter, in this thesis heavy metals, the plant pathogens Erwinia pyrifoliae and Erwinia amylovora and the soil pollutant γ-HCH, is collected from the colony by subsampling. Subsampling the honeybee colony is done by taking and killing bees from the hive (sacrificial) or by collecting target matter from the bee’s exterior without killing the bee (non-sacrificial). In environmental technology terms the application of the honeybee colony is a Passive Sampling Method (PSM). In this thesis the possibilities and restrictions of the PSM honeybee colony are explored.

Bio-indication is a broad research field with one common factor: a living organism (bio) is applied to record an alteration of the environment (indication). The environment may be small such as a laboratory or big such as an ecosystem. Alterations in the organism may vary from detecting substances foreign to the body to mortality of the organism. In environmental technology the concept Source-Path-Receptor (SPR) is applied to map the route of a pollutant. It describes where in the environment the pollution is, how it moves through the environment and where it ends. This environment is the same environment of all living organisms, ergo also honeybees. Honeybees depend on flowers for their food. In the SPR concept, a flower can be a source, path or receptor. Along with collecting pollen, nectar, water and honeydew, target matter is collected by honeybees. Each honeybee functions as a micro-sampler of target matter in the environment, in this case the flower. Each honeybee is part of a honeybee colony and in fact the honeybee colony is the bio-sampler. The honeybee colony is a superorganism. The well-being of the colony prevails over the individual honeybee. Food collection is directed by the colony’s need. Foragers are directed to the most profitable food sources by the bee dance and food exchange (trophallaxis). The result of this feature is that mainly profitable sources are exploited and poor food sources less or not at all. During the active foraging period hundreds to thousands of flowers are visited daily. The nectar, pollen, water and honeydew plus the unintentionally collected target matter is accumulated in the honeybee colony. In order to obtain target matter the colony must be subsampled. This is done by picking bees from the hive-entrance (hive-entering bees) or inside the hive (in-hive bees) and processing them for analysis (sacrificial). This is the most commonly applied method. However, it is possible to subsample the colony without picking and processing the bees by collecting target matter from the hive-entering bee’s exterior (non-sacrificial). For non-sacrificial subsampling of the honeybee colony the Beehold device with the sampling part Beehold tube has been developed. The results of bio-indication with honeybee colonies are qualitative and indicative for follow up study (Chapter 1).

Six bio-indication studies with honeybee colonies for bio-indication of heavy metals, the plant pathogens Erwinia pyrifoliae and Erwinia amylovora and the soil pollutant γ-HCH are presented. Chapter 2 describes how the concentration of eighteen heavy metals in honeybees fluctuate throughout the period of July, August and September (temporal) at the study sites: the city of Maastricht, the urban location with an electricity power plant in Buggenum and along the Nieuwe Waterweg at Hoek van Holland (spatial). A number of the metals have not been previously analysed in honeybees. To study whether honeybees can be used for bio-indication of air pollution, the concentrations of cadmium, vanadium and lead were compared to concentrations found in honeybees. The honeybee colonies were placed next to the air samplers. Only significant differences of metal concentrations in the ambient air also show in honeybees. This was the case with vanadium in ambient air and honeybees. The spatial and temporal differences of cadmium and lead were too futile to demonstrate a correspondence (Chapter 3). In a national surveillance study in 2008 the concentration of eighteen metals in honeybees has been analysed. The results showed a distinct regional pattern. Honeybees in the East of the Netherlands have higher concentrations of heavy metals compared to the bees in the West. Besides regional differences local differences were also recorded. An approximate description of the land use around 148 apiaries (> 50% agriculture, > 50% wooded area, > 50% urban area and mixed use) indicated the impact of land use on metal concentrations in honeybees. In areas with > 50% wood significantly higher concentrations of heavy metals were detected (Chapter 4). Subsampling of the honeybee colonies in Chapter 2, 3 and 4 was done sacrificially. In the studies presented in Chapter 5, 6, and 7 the honeybee colonies were subsampled non-sacrificially or simultaneously non-sacrificially and sacrificially. The plant pathogen E. pyrifoliae causes a flower infection in the strawberry cultivation in greenhouses. In greenhouse strawberry cultivation honeybees are applied for pollination. In Chapter 5 the combination pollination / bio-indication by honeybee colonies is studied. This proved to be a match. E. pyrifoliae could be detected on in-hive bees prior to any symptom of the infection in the flowers. In the Beehold tube, the bacterium was detected at the same time as the first tiny symptoms of the infection. In Chapter 5 the principles on which the Beehold tube is based are presented and discussed. The plant pathogen E. amylovora causes fireblight in orchards. The combination pollination / bio-indication has also been applied in this study performed in Austria in 2013. It is known that E. amylovora can be detected on honeybees prior to any symptom in the flower or on the fruit tree. A fireblight outbreak depends on flowering period, humidity and temperature. In 2013 no fireblight infection emerged in the orchards where the study was performed. Therefore, the bacterium could not be detected on the honeybees. γ-HCH (Lindane) is one of the soil pollutants in the Bitterfeld region in Saxony-Anhalt in Germany. It is the result of dumping industrial waste around the production locations. Although γ-HCH is bound to soil particles there is a flux to groundwater and surface water. Consequently, the pollution may end up in the sediments of the streambed and flood plains. The study objective was to investigate the hypothetic route of γ-HCH from polluted soil (source), via soil erosion and atmospheric deposition (route) to the receptor (flowering flowers) by detecting γ-HCH in the Beehold tube. Although on average over 17000 honeybees passed through the Beehold tube daily for a maximal period of 28 days, no γ-HCH has been detected. The pollen pattern in the Beehold tube revealed where the bees collected the food (Chapter 7).

The application of the honeybee colony has pros and cons. Distinctive pros are many micro samplers, the extensive collection of matter (both food and target matter) and the accumulation in the colony. For successful bio-indication with honeybee colonies, determining factors are: the target matter, location of the target matter, distance between target matter and the honeybee colony, individual or pooled subsampling, the minimal sampling frequency and sample size, and sacrificial or non-sacrificial subsampling applied solely or in combination. Taking bees from a colony impacts upon the colony’s performance and consequently the passive sampling method. Based on a long-years’ experience and inter-collegial discussion it is stated that 3% of the forager bees (hive-entering) and 1.5% of the in-hive bees can be sampled safely without impacting upon the colony. This restriction does not apply when carrying out non-sacrificial subsampling of the honeybee colony (Chapter 8).

Performing bio-indication with honeybee colonies has more applications than have been exploited so far. Further research can make a change. In particular I mention here the combination of pollination and bio-indication and the application of non-sacrificial subsampling solely or in combination with sacrificial subsampling.

Everywhere Apiculture is practiced (all over the world except the polar areas) bio-indication with honeybee colonies can be applied in a simple, practical and low cost way.

'Geen appels met peren vergelijken' : tuinen bij Wageningen UR Glastuinbouw
Strating, J. ; Vries, J.W. de; Kaashoek, B. - \ 2015
Kas techniek 2015 (2015)3. - p. 44 - 45.
glastuinbouw - kastechniek - sensors - instrumenten (meters) - controle - meting - normen - afwijkingen - gebreken - proeven op proefstations - greenhouse horticulture - greenhouse technology - instruments - control - measurement - standards - abnormalities - defects - station tests
Telers zien de informatie die zij verkrijgen via hun sensoren doorgaans als de waarheid. Maar wat als de gebruikte sensoren in de kas een afwijking hebben en daardoor onjuiste informatie verstrekken? Vooral wanneer meerdere bedrijven of afdelingen in een proef worden vergeleken, kan dit tot verkeerde conclusies leiden, met alle gevolgen van dien.
Waterbesparing door slimme en betaalbare sensor
Balendonck, J. - \ 2015
Kas techniek 2015 (2015)april. - p. 34 - 37.
teelt onder bescherming - cultuurmethoden - kunststoftunnels - irrigatie - sensors - instrumenten (meters) - waterbehoefte - vochtmeters - watergebruik - efficiëntie - watergebruiksrendement - irrigatiesystemen - protected cultivation - cultural methods - plastic tunnels - irrigation - instruments - water requirements - moisture meters - water use - efficiency - water use efficiency - irrigation systems
Onderzoekers van Wageningen UR Glastuinbouw hebben in het kader van een Partners voor Water-project laten zien dat Turkse telers met behulp van de AquaTag veel efficiënter kunnen irrigeren. Sturen op vochtsensoren is niet nieuw, maar beschikbare sensoren zijn relatief duur en meten alleen lokaal, terwijl het vochtgehalte sterk kan variëren binnen een kraanvak. Met de AquaTag is nu een goedkope en slimme oplossing voor handen.
Proeven werpen nieuw licht op meten fotosynthese
Reinders, U. ; Dieleman, J.A. - \ 2015
Kas techniek 2015 (2015)april. - p. 28 - 29, 31.
glastuinbouw - kastechniek - proeven - meting - fotosynthese - licht - instrumenten (meters) - gewasmonitoring - greenhouse horticulture - greenhouse technology - trials - measurement - photosynthesis - light - instruments - crop monitoring
In recente projecten, gefinancierd door Kas als Energiebron, zijn drie systemen onderzocht waarmee de fotosynthese van planten kan worden bepaald. Ze werden gebruikt om efficiëntie van het gebruik van licht voor de fotosynthese te meten. De systemen op basis van ETR-meting functioneerden goed. Voor het gewasmonitoringssysteem bleek de praktijk nog weerbarstig.
Watergift en emissie "De lysimeter en vochtsensoren"
Helm, Frank van der - \ 2014
greenhouse horticulture - cropping systems - lysimeters - irrigation water - sensors - instruments - monitoring - emission
Project emissiemanagement implementatie 'de lysimeter en vochtsensoren' : stand van zaken
Voogt, Wim - \ 2014
greenhouse horticulture - cropping systems - lysimeters - sensors - emission - irrigation water - instruments - models - greenhouse crops
De emissiemanagement-tool : vochtsensoren
Balendonck, Jos - \ 2014
greenhouse horticulture - sensors - lysimeters - cropping systems - instruments - irrigation water - decision making - control
Watergift en emissie bij alstroemeria, toepassing lysimeter en vochtsensoren
Voogt, Wim - \ 2014
greenhouse horticulture - alstroemeria - cultural methods - sensors - lysimeters - instruments - irrigation water - emission
Parrot Flower Power scientific experience with Wageningen UR
Noort, F.R. van - \ 2014
Wageningen UR
potplanten - cultivars - plantenontwikkeling - sensors - instrumenten (meters) - gewasmonitoring - temperatuur - vochtigheid - optimalisatiemethoden - landbouwkundig onderzoek - pot plants - plant development - instruments - crop monitoring - temperature - humidity - optimization methods - agricultural research
Parrot Flower Power 60-day Scientific Experience: 500 plants, 19 Species and 150 sensors used in 68 separate simultaneous studies. Parrot and Wageningen University designed a 2-month study to test the thresholds of plant growth. Watch how they brought this amazing experience to life with Parrot Flower power and the knowledge of great botanists. Parrot Flower Power is accompanied by a free dedicated application, downloadable on AppStore Very intuitive, it provides access to rich content and specific advice on the maintenance of plants.
Implementatie emissiemanagementsysteem grondgebonden teelten
Voogt, W. ; Balendonck, J. ; Heinen, M. ; Helm, F.P.M. van der; Janse, J. ; Swinkels, G.L.A.M. - \ 2014
Beiswijk : Wageningen UR Glastuinbouw (Rapport / Wageningen UR Glastuinbouw 1312)
glastuinbouw - cultuurmethoden - instrumenten (meters) - lysimeters - irrigatie - bemesting - emissie - optimalisatiemethoden - meting - beslissingsondersteunende systemen - greenhouse horticulture - cultural methods - instruments - irrigation - fertilizer application - emission - optimization methods - measurement - decision support systems
Bij telers bleek een sterke behoefte voor een eenvoudiger en goedkopere versie van de eerder ontwikkelde lysimeter met automatische drainmeter. Daarom is er een zogenaamde “light” versie van de lysimeter ontwikkeld, met een handmatige meting van de drain. Verder is er een inventarisatie gedaan naar alternatieven voor de eerder gebruikte vochtsensoren. Helaas zijn er (nog) geen sensoren die aan álle randvoorwaarden voldoen voor grondgebonden kasteelten. Met de ontwikkelde tools: lysimeter, drainmeter, sensoren en modellen, kan de watergift en bemesting geoptimaliseerd worden en bijdragen tot emissievermindering bij grondteelten. Bedrijven die de tools actief gebruiken bleken in staat de uitspoeling sterk te kunnen beperken. De interpretatie van vochtsensoren blijft een lastig fenomeen, vanwege de grote verschillen tussen grondsoorten en aspecten van de bedrijfsvoering. Dit vraagt de nodige ervaring die in de loop van meerdere teelten en jaren moet worden opgedaan. De resultaten van de waterbalansen op de bedrijven laten zien dat het goed mogelijk is de berekeningen via het verdampingsmodel en de gegevens van de lysimeter met elkaar in overeenstemming te brengen via een calibratiefactor.
Meer licht toelaten in potplanten : wie durft? Proefresultaten uitdaging aan de praktijk
Kierkels, T. ; Noort, F.R. van; Marcelis, L.F.M. - \ 2014
Onder Glas 11 (2014)8. - p. 46 - 47.
glastuinbouw - potplanten - belichting - lichtregiem - schaduwplanten - gewasmonitoring - instrumenten (meters) - cultuurmethoden - greenhouse horticulture - pot plants - illumination - light regime - shade plants - crop monitoring - instruments - cultural methods
Bij de teelt van schaduwminnende potplanten gaat veel licht, en dus productie, verloren. Het project Grip op Licht heeft de grenzen opgerekt. De planten blijken, onder voorwaarden, veel meer licht aan te kunnen. Daarbij hoort wel een betere manier van monitoren.
Een goedkope vochtsensor voor de boomkwekerij
Dalfsen, P. van; Baltissen, A.H.M.C. ; Stenfert Kroese, W. - \ 2014
De Boomkwekerij 2014 (2014)2. - ISSN 0923-2443 - p. 31 - 31.
boomkwekerijen - houtachtige planten - boomteelt - irrigatiesystemen - sensors - instrumenten (meters) - proeven - vochtigheid - forest nurseries - woody plants - arboriculture - irrigation systems - instruments - trials - humidity
SensorTagSolutions ontwikkelde een goedkoop meetsysteem, AquaTag, zodat meer kraanvakken kunnen worden voorzien van sensoren. Drie boomkwekers in regio Boskoop testen het systeem met hulp van PPO.
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