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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    Rapid Identification of Mycoplasma bovis Strains from Bovine Bronchoalveolar Lavage Fluid with Matrix-Assisted Laser Desorption Ionization-Time of Flight Mass Spectrometry after Enrichment Procedure
    Bokma, Jade ; Driessche, Laura Van; Deprez, Piet ; Haesebrouck, Freddy ; Vahl, Marianne ; Weesendorp, Eefke ; Deurenberg, Ruud H. ; Pardon, Bart ; Boyen, Filip - \ 2020
    Journal of Clinical Microbiology 58 (2020)6. - ISSN 0095-1137
    Bayesian latent class model - lipase activity - Mycoplasma bovirhinis - Mycoplasma bovis - Mycoplasma dispar

    Mycoplasma bovis is a leading cause of pneumonia in modern calf rearing. Fast identification is essential to ensure appropriate antimicrobial therapy. Therefore, the objective of this study was to develop a protocol to identify M. bovis from bronchoalveolar lavage fluid (BALf) with matrix-assisted laser desorption ionization-time of flight mass spectrometry MALDI-TOF MS and to determine the diagnostic accuracy in comparison with other techniques. BALf was obtained from 104 cattle, and the presence of M. bovis was determined in the following three ways: (i) rapid identification of M. bovis with MALDI-TOF MS (RIMM) (BALf was enriched and after 24, 48, and 72 h of incubation and was analyzed using MALDI-TOF MS), (ii) triplex real-time PCR for M. bovis, Mycoplasma bovirhinis, and Mycoplasma dispar, and (iii) 10-day incubation on selective-indicative agar. The diagnostic accuracy of the three tests was determined with Bayesian latent class modeling (BLCM). After 24 h of enrichment, M. bovis was identified with MALDI-TOF MS in 3 out of 104 BALf samples. After 48 and 72 h of enrichment, 32/104 and 38/100 samples, respectively, were M. bovis positive. Lipase-positive Mycoplasma-like colonies were seen in 28 of 104 samples. Real-time PCR resulted in 28/104 positive and 12/104 doubtful results for M. bovis The BLCM showed a sensitivity (Se) and specificity (Sp) of 86.6% (95% credible interval [CI], 69.4% to 97.6%) and 86.4% (CI, 76.1 to 93.8) for RIMM. For real-time PCR, Se was 94.8% (CI, 89.9 to 97.9) and Sp was 88.9% (CI, 78.0 to 97.4). For selective-indicative agar, Se and Sp were 70.5% (CI, 52.1 to 87.1) and 93.9% (CI, 85.9 to 98.4), respectively. These results suggest that rapid identification of M. bovis with MALDI-TOF MS after an enrichment procedure is a promising test for routine diagnostics in veterinary laboratories.

    A review of European ash (Fraxinus excelsior L.): implications for silviculture
    Dobrowolska, D. ; Hein, S. ; Oosterbaan, A. ; Wagner, S. ; Clark, J. ; Skovsgaard, J.P. - \ 2011
    Forestry 84 (2011)2. - ISSN 0015-752X - p. 133 - 148.
    acer-pseudoplatanus l. - north-temperate forests - beech fagus-sylvatica - natural regeneration - angustifolia vahl - broadleaved trees - site factors - fruit dispersal - ground flora - early growth
    European ash (Fraxinus excelsior L.) is common throughout much of Europe and is a valuable broadleaved tree due to its ecological characteristics, outstanding wood properties and high economic value. It is a fast growing species, associated with several forest types and with a scattered distribution in many different forest communities. In this review, we sum up essential characteristics of European ash, relevant to the further development of silvicultural practices. The paper covers site requirements, regeneration and stand establishment, growth dynamics and wood quality, and health and robustness. The review also highlights implications for silviculture and summarizes new information on ash dieback, a phenomenon which is observed in many European countries. Ash grows best on fertile, pH-neutral, deep, freely drained soils and such sites should be favoured if the aim is for high quality timber. Ash grows well at wide spacing which can result in enlarged ring width and increased latewood percentage, making the wood denser and stronger. Relatively short rotations may be recommended, depending on site, to avoid black heart: for example, a harvesting diameter of 60 cm can be reached within 60–75 years at 60–80 ash crop trees per ha. Universal recommendations are therefore for wide spacing with heavy, regular thinning in order to get a large diameter within a relatively short rotation. The necessity for pruning depends on the stand density at establishment and the subsequent thinning regime.
    Morphophysiological development of Tabeluia serratifolia Vahl Nich. seeds
    Carvalho, M.L. ; Nery, M.C. ; Oliveira, L.M. ; Hilhorst, H.W.M. ; Guimaraes, R.M. - \ 2008
    Scientia agricola 65 (2008)6. - ISSN 0103-9016 - p. 643 - 651.
    desiccation tolerance - maturation - proteins - storage - maize - oligosaccharides - quality - sucrose - vigor
    Tabebuia serratifolia is used for the reforestation of degraded areas. Despite protection by law for permanent preservation, the species is in danger of extinction due to improper exploitation. With the objective to aid preservation and long term storage of the species we evaluated morphophysiological alterations of T. serratifolia seeds during the maturation process in order to identify markers that can be used for harvesting and storage. Fruits were collected at anthesis and seven developmental stages from trees growing in Lavras, state of Minas Gerais, Brazil. At each harvest, fruits and seeds were evaluated for color and size, moisture content, dry matter, internal morphology (by X-ray analysis), germination parameters (in vitro and ex vitro), as well as sugar and polyphenol content and heat resistant proteins. During the maturation process the initially green fruits changed to a brownish color and grew from a length of 7 to 18 cm; cracks appeared at the beginning of seed dispersal. The seed color varied from leaf-green to brownish and the length from 1 to 3 cm. The first indicatior of physiological maturity should be observed at 39 days post-anthesis, when variations the color and size of both fruits and seeds were observed. Increase in the moisture content, dry matter and germination, percentage of seeds and embryos in vitro, as well as a reduction in sugar content and LEA proteins were also observed. The physiological maturity of T. serratifolia seeds was reached 53 days after anthesis, coinciding with a maximum of dry matter accumulation and germination (and index of germination speed ex vitro), decrease in phenol levels, higher intensity of heat-resistant protein bands and the beginning of fruit opening.
    Herbal mixtures in the traditional medicine of Eastern Cuba
    Hernández, J. ; Volpato, G. - \ 2004
    Journal of Ethnopharmacology 90 (2004)2. - ISSN 0378-8741 - p. 293 - 316.
    womens health conditions - antimicrobial activity - crescentia-cujete - us embargo - plants - ethnobotany - healers - extract - impact - mexico
    Herbal mixtures in the traditional medicine of Eastern Cuba. Traditional herbal mixtures in Eastern Cuba are investigated through interviews with 130 knowledgeable people and traditional healers of the provinces of Santiago de Cuba and Guantanamo. One hundred seventy plant species and other products are used in 199 formulas, galones being the more complex. Cocos nucifera L. (Arecaceae), Bidens pilosa L. (Asteraceae), Cissus sicyoides L. (Vitaceae), Erythroxylum havanense Jacq. (Erythroxylaceae) and Stachytarpheta jamaicensis (L.) Vahl. (Verbenaceae) are the species most frequently cited. The ecological distribution of the taxa and cultural and anthropological aspects of mixtures are highlighted; particularly American and African influences that have shaped local knowledge about plant combinations are discussed.
    Dietary strategies to influence the gastrointestinal microflora of young animals, and its potential to improve intestinal health
    Snel, J. ; Harmsen, H.J.M. ; Wielen, P.W.J.J. van der; Williams, B.A. - \ 2002
    In: Nutrition and health in the gastrointestinal tract / Blok, M.C., Vahl, H.A., de Lange, L., van de Braak, A.E., Hemke, G., Hessing, M., Wageningen : Wageningen Academic Publishers - p. 37 - 69.
    Optimising nutrient digestion, absorption and gut barrier function in monogastrics: reality or illusion?
    Lange, L. de; Braak, A.E. van de; Hemke, G. ; Hessing, M. - \ 2002
    In: "Nutrition and health of the gastrointestinal tract" / Blok, M.C., Vahl, H.A., de Lange, L., van de Braak, A.E., Hemke, G., Hessing, M.,
    The interactions between feed (components) and Eimeria infections in poultry health
    Lange, L. de; Braak, A.E. van de; Hemke, G. ; Hessing, M. - \ 2002
    In: "Nutrition and health of the gastrointestinal tract" / Jeurissen, S.H.M., Veldman, B., Blok, M.C., Vahl, H.A.,
    Replacement of milk protein by vegetable protein in milk replacer diets for veal calves: digestion in relation to intestinal health
    Lange, L. de; Braak, A.E. van de; Hemke, G. ; Hessing, M. - \ 2002
    In: "Nutrition and health of the gastrointestinal tract" / Verdonk, J.M.A.J, Gerrits, W.J.J., Beynen, A.C., Blok, M.C., Vahl, H.A.,
    Advances in Nutritional Technology
    Poel, A.F.B. van der; Vahl, J.L. ; Kwakkel, R.P. - \ 2001
    In: Advances in Nutritional Technology. : 1st World Feed Conference., Utrecht, The Netherlands, 2001 / van der Poel, A.F.B., Vahl, J.L., Kwakkel, R.P., - p. 262 - 262.
    Stachytarpheta jamaicensis (L.) Vahl
    Valkenburg, J.L.C.H. van; Bunyapraphatsara, N. - \ 2001
    In: Medicinal and Poisonous Plants 2 / van Valkenburg, J.L.C.H., Bunyapraphatsara, N., Leiden : Backhuys Publishers - p. 510 - 513.
    Ayapana triplinervis (Vahl) R.M. King & H. Robinson
    Schmelzer, G.H. - \ 2001
    In: Medicinal and poisonous plants 2 / van Valkenburg, J.L.C.H., Bunyapraphatsara, N., Leiden : Backhuys Publishers - p. 91 - 93.
    Functional properties of diet ingredients: manufacturing and nutritional implications
    Thomas, M. ; Poel, A.F.B. van der - \ 2001
    In: Advances in Nutritional Technology / Van der Poel, A.F.B., Vahl, J.L., Kwakkel, R.P., Utrecht : VICTAM - p. 109 - 122.
    Keuze en installeren van schermen
    Knies, P. ; Vahl, H. - \ 2000
    In: Schermen in de glastuinbouw; energie en teeltaspecten / van den Berg, G.A.,
    Schermen en schermmaterialen
    Knies, P. ; Vahl, H. - \ 2000
    In: Schermen in de glastuinbouw; energie en teeltaspecten / van den Berg, G.A.,
    Gezondheid en functionele kenmerken van de dunne darm van varkens gevoerd met organische zuren
    Mroz, Z. ; meulen, J. van der - \ 1999
    In: Voeding en gezondheid van het maagdarmkanaal / Blok, M.C., de Lange, L., Vahl, H.A., Den Haag : Productschap Diervoeder - p. 13 - 19.
    Fermenteerbare koolhydraten in relatie tot dikke darmgezondheid bij varkens
    Williams, B.A. ; Tamminga, S. ; Verstegen, M.W.A. - \ 1999
    In: Voeding en gezondheid van het maagdarmkanaal / Blok, M.C., de Lange, L., Vahl, H.A., - p. 21 - 28.
    Methionine-behoefte van Peking-eenden
    Buisonjé, F.E. de; Vahl, H.A. ; Getkate, J.A. ; Pieterse, C. - \ 1994
    Praktijkonderzoek voor de Pluimveehouderij 5 (1994)4. - ISSN 0924-9087 - p. 26 - 28.
    cysteïne - cystine - eenden - voer - methionine - eiwittoevoegingen - eiwitten - cysteine - cystine - ducks - feeds - methionine - protein supplements - proteins
    Onderzocht is het effect van verschillende gehalten verteerbare methionine + cystine in het voer op de technische resultaten en slachtrendementen van Peking-eenden.
    Lysine-behoefte van Peking-eenden
    Buisonjé, F.E. de; Vahl, H.A. ; Getkate, J.A. ; Pieterse, C. - \ 1994
    Praktijkonderzoek voor de Pluimveehouderij 5 (1994)3. - ISSN 0924-9087 - p. 35 - 38.
    dierlijke producten - china - samenstelling - eenden - voer - vleesproductie - eiwittoevoegingen - eiwitten - kwaliteit - animal products - china - composition - ducks - feeds - meat production - protein supplements - proteins - quality
    In een proef met Peking-eenden werd het effect getest van verschillende lysine-gehalten in het voer op de technische resultaten en de slachtkwaliteit.
    Mineralenreductie bij vleeskalkoenen; wat is haalbaar?
    Vahl, H.A. - \ 1993
    In: Studiemiddagen vleeskuikenhouderij, kalkoenenhouderij, pelsdierenhouderij en leghennenhouderij Beekbergen : Praktijkonderzoek Pluimveehouderij (PP uitgave : praktijkonderzoek pluimveehouderij 6) - p. 30 - 33.
    Bepaling fytase-effectiviteit in het startvoer van vleeseenden
    Buisonjé, F.E. de; Vahl, H.A. - \ 1993
    Praktijkonderzoek voor de Pluimveehouderij 4 (1993)4. - ISSN 0924-9087 - p. 21 - 24.
    voer - samenstelling - eenden - mineralen - fosfor - toevoegingen - voedersupplementen - enzymen - feeds - composition - ducks - minerals - phosphorus - additives - feed supplements - enzymes
    Verslag van onderzoek naar de fosforbehoefte en fytase-effectiviteit bij vleeseenden t/m drie weken leeftijd. In dit artikel aandacht voor de bepaling van het effect van fytase in het startvoer op de beschikbaarheid van fosfor aan de hand van lichaamsgewicht, botbreuksterkte en botasgehalte op drie weken leeftijd.
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