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.

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The fatter the better : selecting microalgae cells for outdoor lipid production
Dominguez Teles, I. - \ 2016
Wageningen University. Promotor(en): Rene Wijffels, co-promotor(en): Maria Barbosa; Dorinde Kleinegris. - Wageningen : Wageningen University - ISBN 9789462578821 - 164
algae - chlorococcum - lipids - lipogenesis - fat - production - phenotypes - inoculum - diameter - cells - sorting - algen - lipiden - lipogenese - vet - productie - fenotypen - entstof - cellen - sorteren

In chapter 1 we introduce microalgae, photosynthetic microorganisms with potential to replace commodities (such as food, feed, chemicals and fuels). Production costs are still high, reason why microalgae are still only economically feasible for niche markets. We suggest to borrow the concept of plant domestication to select industrial microalgae cells. Two approaches can be successfully used to domesticate microalgae: adaptive laboratory evolution (ALE) and fluorescence assisted cell sorting (FACS). ALE takes advantage of the natural adaptability of microorganisms to different environments, while FACS actually select cells with specific phenotypes. This thesis aimed to select cells of Chlorococcum littorale with improved phenotypes, assuming that these cells could establish new populations with increased industrial performance.

In Chapter 2 we wanted to know what happened during time to biomass and lipid productivities of Chlorococcum littorale repeatedly subjected to N-starvation. We tested 2 different cycles of N-starvation, short (6 days) and long (12 days). Short cycles didn’t affect lipid productivity, highlighting the potential of C. littorale to be produced in semi-continuous cultivation. Repeated cycles of N-starvation could have caused adaptations of the strain. Hence, we also discussed the implications of using repeated N-starvation for adaptive laboratory evolution (ALE) experiments. Chapter 3 introduces a method to detect and to select microalgae cells with increased lipid content. The method requires only the fluorescence dye Bodipy505/515 dissolved in ethanol, and the method was designed to maintain cellular viability so the cells could be used to produce new inoculum. In chapter 4 we evaluated a question that emerged while deciding which criteria to use to sort lipid-rich cells: does cellular size affects lipid productivity of C. littorale? We hypothesized that cells with different diameters have different division rates, which could affect lipid productivity. Therefore, we assessed the influence of cell diameter, as a sorting parameter, on both biomass and lipid productivity of Chlorococcum littorale (comparing populations before and after sorting, based on different diameters). Results showed that the size of vegetative cells doesn’t affect the lipid productivity of C. littorale. In chapter 5 we present a strategy to sort cells of C. littorale with increased TAG productivity using the method developed at chapter 3. Both the original and the sorted population with the highest lipid productivity (namely, S5) were compared under simulated Dutch summer conditions. The results confirmed our data from experiments done under continuous light: S5 showed a double TAG productivity. Our results showed also that the selected phenotype was stable (1.5 year after sorting) and with potential to be used under industrial conditions. In chapter 6 we extrapolated our results (indoor and outdoor) to other climate conditions. We ran simulations changing the light conditions to four different locations worldwide (the Netherlands, Norway, Brazil and Spain) to estimate both biomass and TAG productivities. Results indicated that biomass yields were reduced at locations with higher light intensities (Brazil/Spain) when compared with locations with lower light intensities (Norway/Netherlands). Hence, the choice of location should not be based on light intensity, but on how stable irradiation is. Chapter 7 is the general discussion of the thesis, demonstrating that both ALE and FACS are effective approaches to select industrial microalgae cells. We also present our view on how ALE and FACS could further improve microalgae strains for industry.

Allometric growth relationships of East Africa highland bananas (Musa AAA-EAHB) cv. Kisansa and Mbwazirume
Nyombi, K. ; Asten, P.J.A. van; Leffelaar, P.A. ; Corbeels, M. ; Kaizzi, C.K. ; Giller, K.E. - \ 2009
Annals of Applied Biology 155 (2009)3. - ISSN 0003-4746 - p. 403 - 418.
leaf-area estimation - biomass accumulation - radiation - crop - light - interception - morphology - fertilizer - diameter - height
Highland bananas are an important staple food in East Africa, but there is little information on their physiology and growth patterns. This makes it difficult to identify opportunities for yield improvement. We studied allometric relationships by evaluating different phenological stages of highland banana growth for use in growth assessment, understanding banana crop physiology and yield prediction. Pared corms of uniform size (cv. Kisansa) were planted in a pest-free field in Kawanda (central Uganda), supplied with fertilizers and irrigated during dry periods. In addition, tissue-cultured plants (cv. Kisansa) were planted in an adjacent field and in Ntungamo (southwest Uganda), with various nutrient addition treatments (of N, P, K, Mg, S, Zn, B and Mo). Plant height, girth at base, number of functional leaves and phenological stages were monitored monthly. Destructive sampling allowed derivation of allometric relationships to describe leaf area and biomass distribution in plants throughout the growth cycle. Individual leaf area was estimated as LA (m2) = length (m) × maximum lamina width (m) × 0.68. Total plant leaf area (TLA) was estimated as the product of the measured middle leaf area (MLA) and the number of functional leaves. MLA was estimated as MLA (m2) = -0.404 + 0.381 height (m) + 0.411 girth (m). A light extinction coefficient (k = 0.7) was estimated from photosynthetically active radiation measurements in a 1.0 m grid over the entire day. The dominant dry matter (DM) sinks changed from leaves at 1118 °C days (47% of DM) and 1518 °C days (46% of DM), to the stem at 2125 °C days (43% of DM) and 3383 °C days (58% of DM), and finally to the bunch at harvest (4326 °C days) with 53% of DM. The allometric relationship between above-ground biomass (AGB in kg DM) and girth (cm) during the vegetative phase followed a power function, AGB = 0.0001 (girth)2.35 (R2 = 0.99), but followed exponential functions at flowering, AGB = 0.325 e0.036(girth) (R2 = 0.79) and at harvest, AGB = 0.069 e0.068(girth) (R2 = 0.96). Girth at flowering was a good parameter for predicting yields with R2 = 0.7 (cv. Mbwazirume) and R2 = 0.57 (cv. Kisansa) obtained between actual and predicted bunch weights. This article shows that allometric relationship can be derived and used to assess biomass production and for developing banana growth models, which can help breeders and agronomists to further exploit the crop's potential
A Geometric Model for the Dynamics of Microchannel Emulsification
Zwan, E.A. van der; Schroën, C.G.P.H. ; Boom, R.M. - \ 2009
Langmuir 25 (2009)13. - ISSN 0743-7463 - p. 7320 - 7327.
in-water emulsions - droplet formation - array - channel - cfd - microspheres - prediction - diameter - plate
Microchannel emulsification is an interfacial tension driven method to produce monodisperse microdroplets, or microspheres. In this paper we introduce a model for describing the dynamics of microchannel emulsification based on simple time dependent geometric shape analysis. The model is based on mechanistic principles that simultaneously predicts both process and microchannel geometry effects. The model contains no adjustable (fit) parameters and is thus fully predictive for oil in water emulsification. The model is easy to use and does not require extensive computational time and/or memory. The model was validated by comparison with the experimental results published by Sugiura and co-workers and we found excellent agreement. It was found that the droplet size of oil in water emulsions could be fully predicted using only two dimensionless numbers, an adapted capillary number that also comprises effects of terrace width and height, and the ratio of terrace length over terrace height. Based on these findings, a dimensionless design map could be constructed for a wide range of process conditions and microchannel dimensions
Microchannel Emulsification: From Computational Fluid Dynamics to Predictive Analytical Model
Dijke, K.C. van; Schroën, C.G.P.H. ; Boom, R.M. - \ 2008
Langmuir 24 (2008)18. - ISSN 0743-7463 - p. 10107 - 10115.
emulsion droplet formation - t-shaped microchannel - membrane emulsification - flow - cfd - channel - microspheres - simulation - diameter - tension
Emulsion droplet formation was investigated in terrace-based microchannel systems that generate droplets through spontaneous Laplace pressure driven snap-off. The droplet formation mechanism was investigated through high-speed imaging and computational fluid dynamics (CFD) simulation, and we found good agreement in the overall shape of the phases during droplet formation. An analytical model was derived from the insights that were gained from the CFD simulations, which describes the droplet diameter as a function of applied pressure. The analytical model covers the influence of both process parameters and geometry of the terrace well and can be used for fast optimization and evaluation studies.
De extreme zomer van 2006. Langetermijngevolgen van klimaatverandering
Nabuurs, G.J. ; Orden, W.H. van; Bijlsma, R.J. ; Sass-Klaassen, U. ; Ouden, J. den - \ 2007
Vakblad Natuur Bos Landschap 4 (2007)8. - ISSN 1572-7610 - p. 23 - 23.
houtteelt - houtaanwas - diameter - monitoring - klimaat - silviculture - increment - climate
Om meer inzicht te verkrijgen in zowel korte- als langetermijngevolgen en aanpassingsvermogen van bomen is in 2006 in vijf bosreservaten gestart met een nieuwe methode van langdurige monitoring van diktegroei van bomen. Op dit moment zijn het aantal dendrometers uitgebreid met 100 te verdelen over 22 bosreservaten
Vanggewassen houden meststoffen vast
Nouwens, F.H.C. - \ 2003
De Boomkwekerij 16 (2003)37. - ISSN 0923-2443 - p. 8 - 9.
houtachtige planten als sierplanten - plantenvoeding - uitspoelen - verliezen uit de bodem - voedingsstoffen - onderteelt - diameter - groei - zandgronden - ulmus - ornamental woody plants - plant nutrition - leaching - losses from soil - nutrients - catch cropping - growth - sandy soils
Om uitspoelen van stikstof gedurende de herfst en winter op zandgronden te voorkomen is gezocht naar mogelijkheden van het inzetten van vanggewassen om deze stoffen te binden. Onderzoek is gedaan naar de nutriëntenopname (N P K) van witte weideklaver, winterrogge, Italiaans raaigras en het effect van deze gewassen op de stamomvang van Ulmus 'Lobel'
Afvalwater voldoet niet aan lozingseisen voor riool
Boerekamp, J.A.M. - \ 1995
Praktijkonderzoek / Praktijkonderzoek Rundvee, Schapen en Paarden (PR), Waiboerhoeve 8 (1995)1. - ISSN 0921-8874 - p. 29 - 31.
landbouw - luchtverontreiniging - berekening - diameter - afvoer - milieu - milieuwetgeving - milieubeleid - overheidsbeleid - nederland - pijpen - rioolwater - riolering - bodemverontreiniging - afvalverwijdering - afvalwater - waterverontreiniging - agriculture - air pollution - calculation - discharge - environment - environmental legislation - environmental policy - government policy - netherlands - pipes - sewage - sewerage - soil pollution - waste disposal - waste water - water pollution
In veel gemeenten moet de pH van het afvalwater, dat wordt geloosd op de riolering, tussen 6,5 en 10 liggen.
Een onderzoek naar verbanden tussen sterfte in zomereikenopstanden in Nederland en de grondwatertrap
Oosterbaan, A. ; Nabuurs, G.J. ; Maas, G.J. - \ 1990
Wageningen : De Dorschkamp (Rapport / De Dorschkamp Instituut voor Bosbouw en Groenbeheer nr. 601) - 61
bosbouw - bomen - achteruitgang, bossen - levensvatbaarheid - bodemwater - permeabiliteit - absorptie - hygroscopiciteit - waterrelaties - wortels - bodem - verzuring - bodem ph - bodemaciditeit - nederland - houtaanwas - diameter - omtrek - jaarringonderzoek m.b.v. boorspanen - bodemchemie - anorganische verbindingen - quercus robur - forestry - trees - forest decline - viability - soil water - permeability - absorption - hygroscopicity - water relations - roots - soil - acidification - soil ph - soil acidity - netherlands - increment - girth - increment boring - soil chemistry - inorganic compounds
De jeugdgroei van enkele inheemse loofboomsoorten in relatie tot de groeiplaats
Jager, K. - \ 1990
Wageningen : De Dorschkamp (Rapport / "De Dorschkamp" Instituut voor Bosbouw en Groenbeheer nr. 596) - 56
bosbouw - bomen - houtteelt - bosbouwkundige handelingen - groei - milieufactoren - waterrelaties - voedingsstoffen - wortels - bodemchemie - bodemeigenschappen - hoogte - diameter - volume - bepaling van groeiplaatshoedanigheden - bebossing - groene zones - heggen - nederland - forestry - trees - silviculture - forestry practices - growth - environmental factors - water relations - nutrients - roots - soil chemistry - soil properties - height - site class assessment - afforestation - green belts - hedges - netherlands
Diameterbijgroei en boomafstand bij lijnvormige beplantingen van Populier
Jansen, J.J. - \ 1990
In: Studiekring De Populier: Verslag Studiekringdag Kon. Ned. Bosbouw Ver. / Schmidt, P., - p. 231 - 235.
grondvlak - diameter - voorspellen - bosbouw - omtrek - groene zones - groeimodellen - heggen - hoogte - houtaanwas - bepaling van groeiplaatshoedanigheden - plaatsen op afstand - dunnen - bomen - volume - oogstvoorspelling - opbrengsttabellen - bosopstanden - basal area - forecasting - forestry - girth - green belts - growth models - hedges - height - increment - site class assessment - spacing - thinning - trees - yield forecasting - yield tables - forest stands
Onderzoek naar het optreden van topsterfte bij de Corsicaanse den (Pinus nigra var. maritima) : eindr␁apport over het onderzoek in de periode 1969 t/m 1986
Blok, H. ; Burg, J. van den - \ 1988
Wageningen : De Dorschkamp (Rapport / Rijksinstituut voor Onderzoek in de Bos- en Landschapsbouw "De Dorschkamp" nr. 527) - 68
bosbouw - bomen - insecten - afsterving - mortaliteit - knoppen - bladeren - scheuten - houtaanwas - hoogte - diameter - grondvlak - bosschade - beschadigingen - voedingsstoffentekorten - mineralen - as - planten - mineraalgehalte - forestry - trees - insects - dieback - mortality - buds - leaves - shoots - increment - height - basal area - forest damage - injuries - nutrient deficiencies - minerals - ash - plants - mineral content
Groei en ontwikkeling van populier op opgespoten havenslib bij verschillende aanlegmethoden
Burg, J. van den; Kolster, H.W. - \ 1987
Populier 24 (1987)1. - ISSN 0166-7491 - p. 7 - 8.
grondvlak - diameter - bosbouw - hoogte - houtaanwas - industrieterreinen - mijnstort - baggerspeciedepots - bomen - basal area - forestry - height - increment - industrial sites - mine spoil - spoil banks - trees
De invloed van varkens-, rundvee- en kalverdrijfmest op de groei van populier en enkele andere loofboomsoorten, op zandgronden in het boscomplex Starkriet (onderzoek in de periode 1977 t/m 1984)
Burg, J. van den; Peeters, J.P. - \ 1986
Wageningen : De Dorschkamp (Rapport / Rijksinstituut voor Onderzoek in de Bos- en Landschapsbouw De Dorschkamp nr. 450) - 155
bosbouw - drijfmest - stalmest - houtaanwas - hoogte - diameter - grondvlak - zandgronden - bomen - nederland - bosopstanden - bemesting - noord-brabant - forestry - slurries - farmyard manure - increment - height - basal area - sandy soils - trees - netherlands - forest stands - fertilizer application
Onderzoek in een gebied nabij Someren (Noord-Brabant), waarbij 2 populierebeplantingen (Androscoggin, Robusta, Dorskamp en Donk) op matig vruchtbare vochtige zandgronden werden bemest met 0-100-200 m3/ha aan varkensdrijfmest, of 0-159-235 m3/ha aan kalverdrijfmest. Enkele andere boomsoorten, zoals ruwe berk, schietwilg, esdoorn en es, werden bemest met 0-117-235 m3/ha aan kalverdrijfmest. De mest werd toegediend in juni
De invloed van varkensdrijfmestgiften op de groei van drie populierenopstanden op zandgronden : onderzoek in de periode 1977 t/m 1984 = Effects of pig slurry on the growth of three stands of black poplar hybrids on sandy soils
Burg, J. van den - \ 1986
Wageningen : De Dorschkamp (Rapport / Rijksinstituut voor Onderzoek in de Bos- en Landschapsbouw "De Dorschkamp" nr. 435) - 69
bosbouw - bomen - houtaanwas - hoogte - diameter - grondvlak - populus canescens - bosopstanden - bemesting - forestry - trees - increment - height - basal area - forest stands - fertilizer application
De slaging en jeugdgroei van groveden in twee proeven met verschillende vormen van bodemvoorbereiding
Oosterbaan, A. - \ 1986
Wageningen : De Dorschkamp (Rapport / Rijksinstituut voor Onderzoek in de Bos- en Landschapsbouw "De Dorschkamp" nr. 423) - 21
bosbouw - bomen - grondvoorbereiding - ploegen als grondbewerking - grondbewerking - houtaanwas - hoogte - diameter - grondvlak - Pinus sylvestris - forestry - trees - site preparation - ploughing - tillage - increment - height - basal area
In 2 proefvelden op de Veluwe aangelegd in 1969 en 1973 op zwaklemige holtpodzolgronden is de slaging en de hoogtegroei tot en met 1982 vergeleken van grovedennen geplant op onbewerkte grond, op kullaplaatsen (plantgaten gemaakt door een speciale machine), in woelgaten en op volledig geploegde grond
Bekalking van bossen = Liming of forests
Burg, J. van den - \ 1985
Wageningen : De Dorschkamp (Rapport / Rijksinstituut voor Onderzoek in de Bos- en Landschapsbouw "De Dorschkamp" nr. 401,424)
bosbouw - bodemchemie - bodemaciditeit - verzuring - beluchting - voedingsstoffenopname (planten) - bodem ph - kunstmeststoffen - behoeften - bosschade - zure regen - houtaanwas - hoogte - diameter - grondvlak - mineralen - as - planten - mineraalgehalte - heidegronden - verbetering - zure gronden - kattekleigronden - bosopstanden - bemesting - forestry - soil chemistry - soil acidity - acidification - aeration - nutrient uptake - soil ph - fertilizers - requirements - forest damage - acid rain - increment - height - basal area - minerals - ash - plants - mineral content - heathland soils - improvement - acid soils - acid sulfate soils - forest stands - fertilizer application
Bestaat uit twee onderdelen. 1. Nederlandse literatuur. - 87 p. 2. Een overzicht van de buitenlandse literatuur. - 545 p.
Boomdiameterbepalingen
Hagman, K. ; Schenk, K. - \ 1982
Paramaribo : Universiteit van Suriname - 38
diameter - bosbouw - omtrek - meting - suriname - arbeidskunde - forestry - girth - measurement - work study
Groei, behandeling en kwaliteit van jonge eikenopstanden (Quercus robur L.) in de boswachterij Vaals
Oosterbaan, A. - \ 1981
Wageningen : De Dorschkamp (Rapport / Rijksinstituut voor Onderzoek in de Bos- en Landschapsbouw "De Dorschkamp" no. 253) - 29
bosbouw - bomen - houtteelt - bosbouwkundige handelingen - groei - milieufactoren - houtaanwas - hoogte - diameter - grondvlak - quercus robur - nederland - zuid-limburg - forestry - trees - silviculture - forestry practices - growth - environmental factors - increment - height - basal area - netherlands
De relatie tussen kwaliteit en stabiliteit bij Douglas
Boersma, F. ; Witvoet, B. - \ 1979
Wageningen : De Dorschkamp (Rapport / Rijksinstituut voor onderzoek in de bos- en landschapsbouw "De Dorschkamp" no. 192)
bosbouw - bomen - houtaanwas - hoogte - diameter - grondvlak - meting - opstandsdichtheid - kroon - opstandsstructuur - kroondak - nederland - natuurlijke takafstoting - vertakking - pseudotsuga menziesii - bosopstanden - forestry - trees - increment - height - basal area - measurement - stand density - crown - stand structure - canopy - netherlands - natural pruning - branching - forest stands
De afsluiting van een plantafstandenproef en de opzet van een toekomstbomenproef
Muyden, H.J.P. van - \ 1977
Wageningen : De Dorschkamp (Rapport / Rijksinstituut voor onderzoek in de bos- en landschapsbouw 'De Dorschkamp' no. 129) - 66
bosbouw - bomen - plaatsen op afstand - houtaanwas - hoogte - diameter - grondvlak - dunnen - pinus nigra - nederland - limburg - bosopstanden - forestry - trees - spacing - increment - height - basal area - thinning - netherlands - forest stands
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