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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Complete genome sequence of thermophilic Bacillus smithii type strain DSM 4216T
Bosma, Elleke F. ; Koehorst, Jasper J. ; Hijum, Sacha A.F.T. van; Renckens, Bernadet ; Vriesendorp, Bastienne ; Weijer, Tom van de; Schaap, Peter J. ; Vos, Willem M. de; Oost, John van der; Kranenburg, Richard van - \ 2016
Standards in Genomic Sciences 11 (2016). - ISSN 1944-3277 - 11 p.
Bacillus smithii - Biotechnology - Genome sequence - Lactic acid - Thermophile - Thermophilic bacillus

Bacillus smithii is a facultatively anaerobic, thermophilic bacterium able to use a variety of sugars that can be derived from lignocellulosic feedstocks. Being genetically accessible, it is a potential new host for biotechnological production of green chemicals from renewable resources. We determined the complete genomic sequence of the B. smithii type strain DSM 4216T, which consists of a 3,368,778 bp chromosome (GenBank accession number CP012024.1) and a 12,514 bp plasmid (GenBank accession number CP012025.1), together encoding 3880 genes. Genome annotation via RAST was complemented by a protein domain analysis. Some unique features of B. smithii central metabolism in comparison to related organisms included the lack of a standard acetate production pathway with no apparent pyruvate formate lyase, phosphotransacetylase, and acetate kinase genes, while acetate was the second fermentation product.

Options inside the water box
Gooijer, G. de; Rast, W. ; Tropp, H. ; Aimard, V. ; Allaerts, G. ; Black, M. ; Boelens, R.A. ; Burchl, S. ; Engel, H. ; Harlin, J. ; Hellmuth, M. ; Hendry, S. ; Hudson, A. ; Jägerskog, A. ; Larsen, H. ; Morlarty, P. ; Beek, E. van; Zaag, P. van der; Winpenny, J. - \ 2009
In: Water in a Changing World / Cosgrove, W., Brite, R., McKelvey Clayson, A., London : Earthscan (The United Nations World Water Development Report 3) - ISBN 9781844078394 - p. 241 - 267.
Measurement of lipid transfer protein in 88 apple cultivars
Sancho, A.I. ; Ree, R. van; Leeuwen, A. van; Meulenbroek, E.J. ; Weg, W.E. van de; Gilissen, L.J.W.J. ; Puehringer, H. ; Laimer, M. ; Martinelli, A. ; Zaccharini, M. ; Vazquez-Cortes, S. ; Fernandez-Rivas, M. ; Hoffmann-Sommergruber, K. ; Clare Mills, E.N. ; Zuidmeer, L. - \ 2008
International Archives of Allergy and Immunology 146 (2008)1. - ISSN 1018-2438 - p. 19 - 26.
oral allergy syndrome - malus-domestica - rosaceae fruits - plant foods - in-vivo - pollen - ige - allergenicity - reactivity - mal-d-3
Background: Fruits are a major cause of food allergy in adults. Lipid transfer proteins (LTP) are implicated in severe allergic reactions to fruits, but little is known about LTP content in different cultivars. Objective: Determination of the levels of LTP in a wide range of apple cultivars. Methods: LTP was measured in apples from 53 cultivars grown in Italy and 35 grown in The Netherlands, using three different immunoassays: a competitive ELISA (cELISA), a sandwich ELISA (sELISA) and a RAST inhibition (RI). Selected cultivars were evaluated using the basophil histamine release test (BHR), skin prick test (SPT) and double-blind, placebo-controlled food challenge (DBPCFC). Results: LTP levels measured with the three immunoassays were significantly correlated, as judged by Pearson's correlation (0.61 <Rp <0.65; p <0.0001), but differed with respect to the actual quantities: 3.4-253.2 (sELISA), 2.7-120.2 (cELISA) and 0.4-47.3 µg/g tissue (RI). Between cultivars, LTP titers varied over about a two-log range. Pilot in vitro and in vivo biological testing (BHR, SPT and DBPCFC) with selected cultivars supported the observed differences in LTP levels. Conclusions: Around 100-fold differences in LTP levels exist between apple cultivars. Whether the lowest observed levels of LTP warrant designation as hypo-allergenic requires more extensive confirmation by oral challenges. Determination of cultivar variation in LTP levels provides important information for growers and consumers. Comparison to earlier reported Mal d 1 levels in the same cultivars reveals that a designation as low allergenic does not always coincide for both allergens.
Multimodel ensemble simulations of present-day and near-future tropospheric ozone
Stevenson, D.S. ; Dentener, F.J. ; Schultz, M.G. ; Ellingsen, K. ; Noije, T.P.C. van; Wild, O. ; Zeng, G. ; Amann, M. ; Atherton, C.S. ; Bell, N. ; Bergmann, D.J. ; Bey, I. ; Butler, T. ; Cofala, J. ; Collins, W.J. ; Derwent, R.G. ; Doherty, R.M. ; Drevet, J. ; Eskes, H.J. ; Fiore, A.M. ; Gauss, M. ; Hauglustaine, D.A. ; Horowitz, L.W. ; Isaksen, I.S.A. ; Krol, M.C. ; Lamarque, J.F. ; Lawrence, M.G. ; Montanaro, V. ; Muller, J.F. ; Pitari, G. ; Prather, M.J. ; Pyle, J.A. ; Rast, S. ; Rodriguez, J.M. ; Sanderson, M.G. ; Savage, N.H. ; Shindell, D.T. ; Strahan, S.E. ; Sudo, K. ; Szopa, S. - \ 2006
Journal of Geophysical Research: Atmospheres 111 (2006). - ISSN 2169-897X - p. D08301 - D08301.
chemistry transport models - general-circulation model - biogenic nox emissions - global chemical-model - aircraft mozaic data - climate-change - nonmethane hydrocarbons - methane emissions - surface ozone - atmospheric chemistry
Global tropospheric ozone distributions, budgets, and radiative forcings from an ensemble of 26 state-of-the-art atmospheric chemistry models have been intercompared and synthesized as part of a wider study into both the air quality and climate roles of ozone. Results from three 2030 emissions scenarios, broadly representing “optimistic,” “likely,” and “pessimistic” options, are compared to a base year 2000 simulation. This base case realistically represents the current global distribution of tropospheric ozone. A further set of simulations considers the influence of climate change over the same time period by forcing the central emissions scenario with a surface warming of around 0.7K. The use of a large multimodel ensemble allows us to identify key areas of uncertainty and improves the robustness of the results. Ensemble mean changes in tropospheric ozone burden between 2000 and 2030 for the 3 scenarios range from a 5% decrease, through a 6% increase, to a 15% increase. The intermodel uncertainty (±1 standard deviation) associated with these values is about ±25%. Model outliers have no significant influence on the ensemble mean results. Combining ozone and methane changes, the three scenarios produce radiative forcings of -50, 180, and 300 mW m-2, compared to a CO2 forcing over the same time period of 800–1100 mW m-2. These values indicate the importance of air pollution emissions in short- to medium-term climate forcing and the potential for stringent/lax control measures to improve/worsen future climate forcing. The model sensitivity of ozone to imposed climate change varies between models but modulates zonal mean mixing ratios by ±5 ppbv via a variety of feedback mechanisms, in particular those involving water vapor and stratosphere-troposphere exchange. This level of climate change also reduces the methane lifetime by around 4%. The ensemble mean year 2000 tropospheric ozone budget indicates chemical production, chemical destruction, dry deposition and stratospheric input fluxes of 5100, 4650, 1000, and 550 Tg(O3) yr-1, respectively. These values are significantly different to the mean budget documented by the Intergovernmental Panel on Climate Change (IPCC) Third Assessment Report (TAR). The mean ozone burden (340 Tg(O3)) is 10% larger than the IPCC TAR estimate, while the mean ozone lifetime (22 days) is 10% shorter. Results from individual models show a correlation between ozone burden and lifetime, and each model's ozone burden and lifetime respond in similar ways across the emissions scenarios. The response to climate change is much less consistent. Models show more variability in the tropics compared to midlatitudes. Some of the most uncertain areas of the models include treatments of deep tropical convection, including lightning NO x production; isoprene emissions from vegetation and isoprene's degradation chemistry; stratosphere-troposphere exchange; biomass burning; and water vapor concentrations.
The global atmospheric environment for the next generation
Dentener, F. ; Stevenson, D. ; Ellingsen, K. ; Noije, T. van; Schultz, M. ; Amann, M. ; Atherton, C. ; Bell, N. ; Bergmann, D. ; Bey, I. ; Bouwman, L. ; Butler, T. ; Cofala, J. ; Collins, B. ; Drevet, J. ; Doherty, R. ; Eickhout, B. ; Eskes, H. ; Fiore, A. ; Gauss, M. ; Hauglustaine, D. ; Horowitz, L. ; Isaksen, I.S.A. ; Josse, B. ; Lawrence, M. ; Krol, M.C. ; Lamarque, J.F. ; Montanaro, V. ; Müller, J.F. ; Peuch, V.H. ; Pitari, G. ; Pyle, J. ; Rast, S. ; Rodriguez, J. ; Sanderson, M. ; Savage, N.H. ; Shindell, D. ; Strahan, S. ; Szopa, S. ; Sudo, K. ; Dingenen, R. van; Wild, O. ; Zeng, G. - \ 2006
Environmental Science and Technology 40 (2006)11. - ISSN 0013-936X - p. 3586 - 3594.
nitrogen deposition - tropospheric ozone - surface ozone - impact - africa
Air quality, ecosystem exposure to nitrogen deposition, and climate change are intimately coupled problems: we assess changes in the global atmospheric environment between 2000 and 2030 using 26 state-of-the-art global atmospheric chemistry models and three different emissions scenarios. The first (CLE) scenario reflects implementation of current air quality legislation around the world, while the second (MFR) represents a more optimistic case in which all currently feasible technologies are applied to achieve maximum emission reductions. We contrast these scenarios with the more pessimistic IPCC SRES A2 scenario. Ensemble simulations for the year 2000 are consistent among models and show a reasonable agreement with surface ozone, wet deposition, and NO2 satellite observations. Large parts of the world are currently exposed to high ozone concentrations and high deposition of nitrogen to ecosystems. By 2030, global surface ozone is calculated to increase globally by 1.5 +/- 1.2 ppb (CLE) and 4.3 +/- 2.2 ppb (A2), using the ensemble mean model results and associated +/- 1 sigma standard deviations. Only the progressive MFR scenario will reduce ozone, by -2.3 +/- 1.1 ppb. Climate change is expected to modify surface ozone by -0.8 +/- 0.6 ppb, with larger decreases over sea than over land. Radiative forcing by ozone increases by 63 +/- 15 and 155 +/- 37 mW m(-2) for CLE and A2, respectively, and decreases by -45 +/- 15 mW m(-2) for MFR. We compute that at present 10.1% of the global natural terrestrial ecosystems are exposed to nitrogen deposition above a critical load of 1 g N m(-2) yr(-1). These percentages increase by 2030 to 15.8% (CLE), 10.5% (MFR), and 25% (A2). This study shows the importance of enforcing current worldwide air quality legislation and the major benefits of going further. Nonattainment of these air quality policy objectives, such as expressed by the SRES-A2 scenario, would further degrade the global atmospheric environment.
Nitrogen and sulfar desposition on regional and global scales: A multimodel evaluation
Dentener, F. ; Drevet, J. ; Lamarque, J.F. ; Bey, I. ; Eickhout, B. ; Fiore, A.M. ; Hauglustaine, D. ; Horowitz, L.W. ; Krol, M.C. ; Kulshrestha, U.C. ; Lawrence, M. ; Galy-Lacaux, C. ; Rast, S. ; Shindell, D. ; Stevenson, D. ; Noije, T. van; Atherton, C. ; Bell, N. ; Bergman, D. ; Butler, T. ; Cofala, J. ; Collins, B. ; Doherty, R. ; Ellingsen, K. ; Galloway, J. ; Gauss, M. ; Montanaro, V. ; Müller, J.F. ; Pitari, G. ; Rodriguez, J. ; Sanderson, M. ; Solmon, F. ; Strahan, S. ; Schultz, M. ; Sudo, K. ; Szopa, S. ; Wild, O. - \ 2006
Global Biogeochemical Cycles 20 (2006). - ISSN 0886-6236 - 21 p.
tropospheric ozone - biodiversity hotspots - ecosystems - emissions - cycle - aerocom - ammonia - europe - future - model
We use 23 atmospheric chemistry transport models to calculate current and future (2030) deposition of reactive nitrogen (NOy, NHx) and sulfate (SOx) to land and ocean surfaces. The models are driven by three emission scenarios: (1) current air quality legislation (CLE); (2) an optimistic case of the maximum emissions reductions currently technologically feasible (MFR); and (3) the contrasting pessimistic IPCC SRES A2 scenario. An extensive evaluation of the present-day deposition using nearly all information on wet deposition available worldwide shows a good agreement with observations in Europe and North America, where 60–70% of the model-calculated wet deposition rates agree to within ±50% with quality-controlled measurements. Models systematically overestimate NHx deposition in South Asia, and underestimate NOy deposition in East Asia. We show that there are substantial differences among models for the removal mechanisms of NOy, NHx, and SOx, leading to ±1 s variance in total deposition fluxes of about 30% in the anthropogenic emissions regions, and up to a factor of 2 outside. In all cases the mean model constructed from the ensemble calculations is among the best when comparing to measurements. Currently, 36–51% of all NOy, NHx, and SOx is deposited over the ocean, and 50–80% of the fraction of deposition on land falls on natural (nonagricultural) vegetation. Currently, 11% of the world's natural vegetation receives nitrogen deposition in excess of the “critical load” threshold of 1000 mg(N) m-2 yr-1. The regions most affected are the United States (20% of vegetation), western Europe (30%), eastern Europe (80%), South Asia (60%), East Asia (40%), southeast Asia (30%), and Japan (50%). Future deposition fluxes are mainly driven by changes in emissions, and less importantly by changes in atmospheric chemistry and climate. The global fraction of vegetation exposed to nitrogen loads in excess of 1000 mg(N) m-2 yr-1 increases globally to 17% for CLE and 25% for A2. In MFR, the reductions in NOy are offset by further increases for NHx deposition. The regions most affected by exceedingly high nitrogen loads for CLE and A2 are Europe and Asia, but also parts of Africa.
Multimodel simulations of carbon monoxide: Comparison with observations and projected near-future changes
Shindell, D.T. ; Faluvegi, G. ; Stevenson, D.S. ; Krol, M.C. ; Emmons, L.K. ; Lamarque, J.F. ; Petron, G. ; Dentener, F.J. ; Ellingsen, K. ; Schultz, M.G. ; Wild, O. ; Amann, M. ; Atherton, C.S. ; Bergmann, D.J. ; Bey, I. ; Butler, T. ; Cofala, J. ; Collins, W.J. ; Derwent, R.G. ; Doherty, R.M. ; Drevet, J. ; Eskes, H.J. ; Fiore, A.M. ; Gauss, M. ; Hauglustaine, D.A. ; Horowitz, L.W. ; Isaksen, I.S.A. ; Lawrence, M.G. ; Montanaro, V. ; Muller, J.F. ; Pitari, G. ; Prather, M.J. ; Pyle, J.A. ; Rast, S. ; Rodriguez, J.M. ; Sanderson, M.G. ; Savage, N.H. ; Strahan, S.E. ; Sudo, K. ; Szopa, S. ; Unger, N. ; Noije, T.P.C. van; Zeng, G. - \ 2006
Journal of Geophysical Research: Atmospheres 111 (2006). - ISSN 2169-897X - 24 p.
chemical-transport model - stratosphere-troposphere exchange - general-circulation model - aircraft mozaic data - nonmethane hydrocarbons - ozone simulations - methane emissions - western pacific - climate-change - 3-d models
We analyze present-day and future carbon monoxide (CO) simulations in 26 state-of-the-art atmospheric chemistry models run to study future air quality and climate change. In comparison with near-global satellite observations from the MOPITT instrument and local surface measurements, the models show large underestimates of Northern Hemisphere (NH) extratropical CO, while typically performing reasonably well elsewhere. The results suggest that year-round emissions, probably from fossil fuel burning in east Asia and seasonal biomass burning emissions in south-central Africa, are greatly underestimated in current inventories such as IIASA and EDGAR3.2. Variability among models is large, likely resulting primarily from intermodel differences in representations and emissions of nonmethane volatile organic compounds (NMVOCs) and in hydrologic cycles, which affect OH and soluble hydrocarbon intermediates. Global mean projections of the 2030 CO response to emissions changes are quite robust. Global mean midtropospheric (500 hPa) CO increases by 12.6 +/- 3.5 ppbv (16%) for the high-emissions (A2) scenario, by 1.7 +/- 1.8 ppbv (2%) for the midrange (CLE) scenario, and decreases by 8.1 +/- 2.3 ppbv (11%) for the low-emissions (MFR) scenario. Projected 2030 climate changes decrease global 500 hPa CO by 1.4 +/- 1.4 ppbv. Local changes can be much larger. In response to climate change, substantial effects are seen in the tropics, but intermodel variability is quite large. The regional CO responses to emissions changes are robust across models, however. These range from decreases of 10-20 ppbv over much of the industrialized NH for the CLE scenario to CO increases worldwide and year-round under A2, with the largest changes over central Africa (20-30 ppbv), southern Brazil (20-35 ppbv) and south and east Asia (30-70 ppbv). The trajectory of future emissions thus has the potential to profoundly affect air quality over most of the world's populated areas.
The role of profilin and lipid transfer protein in strawberry allergy in the Mediterranean area
Zuidmeer, L. ; Salentijn, E.M.J. ; Rivas, S. ; Mancebo, E.G. ; Asero, R. ; Matos, C.I. ; Pelgrom, K.T.B. ; Gilissen, L.J.W.J. ; Ree, R. van - \ 2006
Clinical and Experimental Allergy 36 (2006)5. - ISSN 0954-7894 - p. 666 - 675.
birch pollen - contact urticaria - cross-reactivity - swiss-model - fruits - foods - identification - bet-v-1 - antibodies - vegetables
BACKGROUND: In contrast to other Rosaceae fruit, only few cases of patients with adverse reactions to strawberry are listed in literature. OBJECTIVE To identify allergenic proteins in strawberry and to express and characterize recombinant strawberry lipid transfer protein (LTP; rFra a 3). METHODS: Established apple-allergic patients were recruited on the basis of a reported allergic reaction to strawberry (n=28, confirmed by double-blind placebo-controlled food challenge in four patients) or on the basis of IgE reactivity to LTP (n=34). Sensitization to purified natural and recombinant allergens was assessed by RAST, immunoblot (inhibition) and basophil histamine release (BHR). A strawberry cDNA library was screened for genes homologous to known fruit allergens. Fra a 3 was cloned and expressed in the yeast Pichia pastoris and compared with peach and apple LTP by RAST, immunoblot-inhibition and BHR tests. RESULTS: Genes homologous to Bet v 1, Bet v 6, profilin and LTP were identified in a strawberry cDNA library. In BHR the rFra a 3 induced histamine release at a 100-fold higher concentration than peach LTP. RAST inhibition showed high cross-reactivity to peach and apple LTP, although IgE reactivity was lower by a factor 5. On strawberry immunoblot, patients' IgE showed reactivity to a Bet v 1 homologue, profilin, LTP and high-molecular weight bands. CONCLUSION: In addition to a Bet v 1 homologue, strawberry also contains IgE-binding profilin and LTP. The rFra a 3 has less allergenic potency than peach and apple LTP, and therefore is an interesting tool for future immunotherapy. Fra a 3 does not seem to be clinically relevant.
Understanding vegetation response to climate variability from space: recent advances towards the SPECTRA mission
Menenti, M. ; Rast, M. ; Baret, F. ; Hurk, B. van den; Knorr, W. ; Mauser, W. ; Miller, J. ; Moreno, J. ; Schaepman, M.E. ; Verstraete, M. - \ 2005
Rivista Italiana di Telerilevamento 33/34 (2005). - ISSN 1129-8596 - p. 193 - 206.
Measurements of the rate of increase of atmospheric CO2 and calculations of the global CO2 budgets imply that a large fraction of emissions is being absorbed in terrestrial carbon pools and that current estimates put the biosphere sink at roughly about half the emissions. The SPECTRA mission addresses these issues by providing detailed observations to help understanding the terrestrial component of the carbon cycle. Scientific preparations for SPECTRA are pursued along two avenues: a) the nature of the expected data and candidate algorithms are evaluated by generating and using synthetic hyper-spectral multi-angular radiometric data; b) algorithms are evaluated with actual hyper-spectral data colelcted with a variety of airborne systems and concurrent ground measurements
The design and prototyping of the SPECTRA simulator architecture
Dangel, S. ; Brazile, J. ; Kneubuehler, M. ; Itten, K.I. ; Petitcolin, F. ; Jia, L. ; Miesch, C. ; Gloor, M. ; Moreno, J. ; Schaepman, M.E. ; Carnicero, B. ; Rast, M. - \ 2005
In: Imaging Spectroscopy - New Quality in Environmental Studies, 27-29 April, 2005, Warsaw. - Warsaw : EARSeL - p. 129 - 135.
Understanding vegetation response to climate variability from space with hyper-spectral, multi-angular observations
Menenti, M. ; Rast, M. ; Bach, H. ; Baret, F. ; Hurk, B. van den; Jia, L. ; Li, Z.L. ; Knorr, W. ; Probeck, M. ; Mauser, W. ; Miller, J. ; Moreno, J. ; Schaepman, M.E. ; Verhoef, W. ; Verstraete, M. - \ 2005
In: 9th International Symposium on Physical Measurements and Signatures in Remote Sensing (ISPMSRS), Beijing, 17-19 October 2005. - Beijing : ISPRS WG VII/1 - p. 72 - 75.
Many vegetation properties are related to features of reflectance spectra in the region 400 nm - 2500 nm. and to emittance in region 8 mm - 14 mm Detailed observations of spectral reflectance reveal subtle features related to biochemical components of leaves such as chlorophyll and water. Exchange of energy between the biosphere and the atmosphere is an important mechanism determining the response of vegetation to climate variability. This requires measurements of the component temperature of foliage and soil. The latter are closely related to the angular variation in thermal infrared emittance. The architecture of vegetation canopies determines complex changes of observed reflectance and emittance spectra with view and illumination angle. Quantitative analysis of reflectance and emittance spectra requires, therefore, an accurate characterization of the anisotropy of radiance. This can be achieved with nearly - simultaneous observations at different view angles. The Surface Processes and Ecosystem Changes Through Response Analysis (SPECTRA) Mission has been conceived to perform these observations at high spatial resolution by taking advantage of the spacecraft agility. Scientific preparations are pursued along two avenues: a) the nature of the expected data and candidate algorithms are evaluated by generating and using synthetic hyper - spectral multi - angular/radiometric data; b) algorithms are evaluated with actual hyper - spectral data collected with a variety of airborne systems and concurrent ground measurements; Campaigns have been performed using radiometric observations provided by ATSR, AATSR, AirMISR, CHRIS - PROBA and a variety of airborne hyperspectral systems. The paper will cover highlights of these studies.
SPECTRA - Surface Processes and Ecosystem Changes Through Response Analysis
Menenti, M. ; Fuchs, J. ; Rast, M. ; Baret, F. ; Hurk, B. van den; Knorr, W. ; Mauser, W. ; Miller, J.R. ; Moreno, J.F. ; Schaepman, M.E. ; Verstraete, M.M. - \ 2004
In: Proceedings Earth Explorers User Consultation Meeting, Frascati, 2004 Frascati, Italy : ESA - p. 1 - 48.
Understanding vegetation response to climate variability from space: Recent advances towards the SPECTRA mission
Menenti, M. ; Rast, M. ; Baret, F. ; Hurk, B. van den; Knorr, W. ; Mauser, W. ; Miller, J.R. ; Moreno, J.F. ; Schaepman, M.E. ; Verstraete, M.M. - \ 2004
In: Eos. Trans. AGU, 85(17), Joint Assembly Suppl. Abstract GC53A-05 Montreal : - p. GC53A - 05.
SPECTRA - Surface Processes and Ecosystem Changes Through Response Analysis
Rast, M. ; Baret, F. ; Hurk, B. van den; Knorr, W. ; Mauser, W. ; Menenti, M. ; Miller, J. ; Moreno, J. ; Schaepman, M.E. ; Verstraete, M. - \ 2004
Noordwijk : ESA Publications Division (ESA SP 1279(2)) - 66 p.
Understanding vegetation response to climate variability from space: recent advances towards the SPECTRA Mission
Menenti, M. ; Rast, M. ; Baret, F. ; Hurk, B. van den; Knorr, W. ; Mauser, W. ; Miller, J. ; Moreno, J. ; Schaepman, M.E. ; Verstraete, M.M. - \ 2004
In: Proceedings of SPIE: Sensors, Systems, and Next-Generation Satellites VII. - - p. 76 - 85.
How accurate and safe is diagnosis of hazelnut allergy by means of commercial skin prick test reagents?
Akkerdaas, J.H. ; Wensing, M. ; Knulst, A.C. ; Krebitz, M. ; Breiteneder, H. ; Vries, S.C. de; Penninks, A.H. ; Aalberse, R.C. ; Hefle, S.L. ; Ree, R. van - \ 2003
International Archives of Allergy and Immunology 132 (2003). - ISSN 1018-2438 - p. 132 - 140.
lipid transfer protein - major allergen - double-blind - cross-reactivity - vegetable foods - brazil-nut - identification - pollen - ige - peanut
Background: Allergy to tree nuts, like hazelnuts, ranks among the most frequently observed food allergies. These allergies can start at early childhood and are, in contrast to other food allergies, not always outgrown by the patient. Tree nut allergy is frequently associated with severe reactions. Diagnosis partially relies on in vivo testing by means of a skin prick test (SPT) using commercially available SPT reagents. Methods: Protein and allergen composition of nine commercial SPT solutions was evaluated using standard protein detection methods and specific immunoassays for measurement of five individual allergens. Diagnostic performance was assessed by SPT in 30 hazelnut-allergic subjects, of which 15 were provocation proven. Results: Protein concentrations ranged from 0.2-14 mg/ml. SDS-PAGE/silver staining revealed clear differences in protein composition. The major allergen Cor a 1 was present in all extracts but concentrations differed up to a factor 50. An allergen associated with severe symptoms, Cor a 8 (lipid transfer protein), was not detected on immunoblot in three products, and concentrations varied by more than a factor 100 as was shown by RAST inhibition. Similar observations were made for profilin, thaumatin-like protein and a not fully characterized 38-kD allergen. Ratios of individual allergens were variable among the nine extracts. SPT showed significant difference, and 6/30 patients displayed false-negative results using 3/9 products. Conclusion: Variability in the composition of products for the diagnosis of hazelnut allergy is extreme. Sometimes, allergens implicated in severe anaphylaxis are not detected by immunoblotting. These shortcomings in standardisation and quality control can potentially cause a false-negative diagnosis in subjects at risk of severe reactions to hazelnuts. Copyright (C) 2003 S. Karger AG, Basel.
Understanding Vegetation Response to Climate Variability from Space: Recent Advances Towards the SPECTRA Mission
Menenti, M. ; Rast, M. ; Baret, F. ; Hurk, B. van den; Knorr, W. ; Mauser, W. ; Miller, J. ; Moreno, J. ; Schaepman, M.E. ; Verstraete, M. - \ 2003
In: Geophysical Research Abstracts EGU - p. 03234 - 03234.
Imaging Spectroscopy as a Quantitative Tool for the Retrieval of Biogeophysical Parameters
Schaepman, M.E. ; Itten, K.I. ; Rast, M. - \ 2003
Geographica Helvetica 58 (2003)2. - ISSN 0016-7312 - p. 120 - 130.
Lipid transfer protein: A pan-allergen in plant-derived foods that is highly resistant to pepsin digestion
Asero, R. ; Mistrello, G. ; Roncarolo, D. ; Vries, S.C. de; Gautier, M.F. ; Ciurana, C.L. ; Verbeek, E. ; Mohammadi, T. ; Knul-Brettlova, V. ; Akkerdaas, J.H. ; Bulder, I. ; Aalberse, R.C. ; Ree, R. van - \ 2001
International Archives of Allergy and Immunology 124 (2001)1-3. - ISSN 1018-2438 - p. 67 - 69.
pollen allergens - cross-reactivity - apple - identification - stability - rosaceae - profilin - peach - ige
Background: Lipid transfer proteins (LTPs) are stable and highly conserved proteins of around 10 kD. They have recently been identified as allergens in fruits of the Rosaceae family. Objective: The aim of this study was to investigate whether the highly conserved structure of LTPs justifies a designation as a true pan-allergen, and to study the role of protein stability in allergenicity. Methods: Thirty-eight patients with a positive skin prick test to Rosaceae fruit extracts were characterized by interviews and skin prick tests. To investigate IgE cross-reactivity between Rosaceae and non-Rosaceae LTPs, RAST and RAST inhibition as well as ELISA and ELISA inhibition were performed, using whole food extracts and purified natural and recombinant LTPs. To address the role of protein stability in the allergenicity of LTP, fruit extracts and LTPs were digested with pepsin. Results: IgE antibodies to Rosaceae LTPs cross-reacted with a broad range of non-Rosaceae vegetable foods. Inhibition studies with purified natural and recombinant LTPs confirmed the role of LTP in this cross-reactivity. Many of the patients with this type of cross-reactive IgE antibodies had a clinical food allergy. In contrast to the typical birch Rosaceae cross-reactive patients, the oral allergy syndrome was frequently accompanied by more severe and systemic reactions. IgE reactivity to LTP was shown to be resistant to pepsin treatment of the allergen. Conclusion: LTP is a true pan-allergen with a degree of cross-reactivity comparable to profilin. Due to its extreme resistance to pepsin digestion, LTP is a potentially severe food allergen
Estimation of soil and vegetation temperatures with multiangular thermal infrared observations: IMGRASS, HEIFE, and SGP 1997 experiments
Menenti, M. ; Jia, L. ; Li, Z.L. ; Djepa, V. ; Wang, J. ; Stoll, M.P. ; Su, Z. ; Rast, M. - \ 2001
Journal of Geophysical Research 106 (2001)D11. - ISSN 0148-0227 - p. 11997 - 12010.
remote sensing - China - atmosfeer - bodem - geo-informatie - temperatuur - vegetatie - Azië
The potential of directional observations in the thermal infrared region for land surface studies is a largely uncharted area of research. The availability of the dual-view Along Track Scanning Radiometer (ATSR) observations led to explore new opportunities in this direction. In the context of studies on heat transfer at heterogeneous land surfaces, multiangular thermal infrared (TIR) observations offer the opportunity of overcoming fundamental difficulties in modeling sparse canopies. Three case studies were performed on the estimation of the component temperatures of foliage and soil. The first one included the use of multi-temporal field measurements at view angles of 0°, 23° and 52°. The second and third one were done with directional ATSR observations at view angles of 0° and 53° only. The first one was a contribution to the Inner-Mongolia Grassland Atmosphere Surface Study (IMGRASS) experiment in China, the second to the Hei He International Field Experiment (HEIFE) in China and the third one to the Southern Great Plains 1997 (SGP 1997) experiment in Oklahoma, United States. The IMGRASS experiment provided useful insights on the applicability of a simple linear mixture model to the analysis of observed radiance. The HEIFE case study was focused on the large oasis of Zhang-Ye and led to useful estimates of soil and vegetation temperatures. The SGP 1997 contributed a better understanding of the impact of spatial heterogeneity on the accuracy of retrieved foliage and soil temperatures. Limitations in the approach due to varying radiative and boundary layer forcing and to the difference in spatial resolution between the forward and the nadir view are evaluated through a combination of modeling studies and analysis of field data.
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