Staff Publications

Staff Publications

  • external user (warningwarning)
  • Log in as
  • language uk
  • About

    '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.

    We have a manual that explains all the features 

Records 1 - 100 / 129

  • help
  • print

    Print search results

  • export

    Export search results

  • alert
    We will mail you new results for this query: q=Maassen
Check title to add to marked list
Informatieve innovatiedag over onkruidbeheersing
Booij, Johan - \ 2019
Informatieve innovatiedag over onkruidbeheersing
Booij, Johan ; Hoekzema, Gerard - \ 2019
A bead-based suspension array for the detection of Salmonella antibodies in pig sera
Wal, F.J. van der; Achterberg, R.P. ; Maassen, Catharina B.M. - \ 2018
Salmonella - serology - pig - swine - bead-based suspension array - LPS - triazine chemistry
Background Slaughter pigs are monitored for the presence of the zoonotic pathogen Salmonella, using both serology and bacteriology. ELISAs used to investigate pig herds are based on the detection of antibodies against components of the Salmonella cell envelope. Nearly all Salmonella isolates in food-producing animals are serovars of Salmonella enterica subspecies enterica, distributed over various serogroups as determined by the composition of their lipopolysaccharide (LPS). ELISAs for Salmonella serology are usually based on serogroup B and C1 LPS, often combined with serogroup D or E LPS. Although C2 LPS may improve serology, use of C2 LPS in a broad ELISA was never achieved. Results To enable detection of serum antibodies against Salmonella in pigs, a bead-based suspension array was developed with five LPS variants (B, 2Ă— C1, C2, D1), each conjugated to a different bead set using triazine chemistry. Reactivity of the beads was confirmed with rabbit agglutination sera and with experimental pig sera. With a mixture of bead sets, 175 sera from slaughter pigs were investigated for the presence of antibodies against Salmonella. With a combination of ROC analysis (B and D LPS) and a prevalence estimation based on historic data (C LPS), individual cut-offs were defined for each LPS-conjugated bead set, and assay performance was evaluated. Results of the suspension array (BC1C1C2D) suggest that more pigs are seroconverted than indicated by a commercial BC1D1-ELISA, and that most of these extra seropositive samples give a signal on one of the beads with C LPS. These results show that expansion of a standard panel with more C LPS variants improves antibody detection. Conclusions A suspension array for Salmonella serology in pigs was developed, that detects more seropositive sera than ELISA, which is achieved by expanding the panel of Salmonella LPS variants, including C2 LPS. The results demonstrate that bead-based suspension arrays allow for testing of pig sera, with the advantage of being able to set cut-offs per antigen. Ultimately, this type of assay can be applied in routine veterinary serology to test for antibodies against multiple Salmonella serovars (or other pathogens) in one single serum sample, using up-to-date antigen panels.
A bead-based suspension array for the detection of Salmonella antibodies in pig sera
Wal, Fimme J. van der; Achterberg, René P. ; Maassen, Catharina B.M. - \ 2018
BMC Veterinary Research 14 (2018)1. - ISSN 1746-6148
Bead-based suspension array - LPS - Pig - Salmonella - Serology - Swine - Triazine chemistry

Background: Slaughter pigs are monitored for the presence of the zoonotic pathogen Salmonella, using both serology and bacteriology. ELISAs used to investigate pig herds are based on the detection of antibodies against components of the Salmonella cell envelope. Nearly all Salmonella isolates in food-producing animals are serovars of Salmonella enterica subspecies enterica, distributed over various serogroups as determined by the composition of their lipopolysaccharide (LPS). ELISAs for Salmonella serology are usually based on serogroup B and C1 LPS, often combined with serogroup D or E LPS. Although C2 LPS may improve serology, use of C2 LPS in a broad ELISA was never achieved. Results: To enable detection of serum antibodies against Salmonella in pigs, a bead-based suspension array was developed with five LPS variants (B, 2× C1, C2, D1), each conjugated to a different bead set using triazine chemistry. Reactivity of the beads was confirmed with rabbit agglutination sera and with experimental pig sera. With a mixture of bead sets, 175 sera from slaughter pigs were investigated for the presence of antibodies against Salmonella. With a combination of ROC analysis (B and D LPS) and a prevalence estimation based on historic data (C LPS), individual cut-offs were defined for each LPS-conjugated bead set, and assay performance was evaluated. Results of the suspension array (BC1C1C2D) suggest that more pigs are seroconverted than indicated by a commercial BC1D1-ELISA, and that most of these extra seropositive samples give a signal on one of the beads with C LPS. These results show that expansion of a standard panel with more C LPS variants improves antibody detection. Conclusions: A suspension array for Salmonella serology in pigs was developed, that detects more seropositive sera than ELISA, which is achieved by expanding the panel of Salmonella LPS variants, including C2 LPS. The results demonstrate that bead-based suspension arrays allow for testing of pig sera, with the advantage of being able to set cut-offs per antigen. Ultimately, this type of assay can be applied in routine veterinary serology to test for antibodies against multiple Salmonella serovars (or other pathogens) in one single serum sample, using up-to-date antigen panels.

A cross sectional study on Dutch layer farms to investigate the prevalence and potential risk factors for different Chlamydia species
Heijne, Marloes ; Goot, Jeanet A. van der; Fijten, Helmi ; Giessen, Joke W. van der; Kuijt, Eric ; Maassen, Catharina B.M. ; Roon, Annika van; Wit, Ben ; Koets, Ad P. ; Roest, Hendrik I.J. - \ 2018
PLoS ONE 13 (2018)1. - ISSN 1932-6203
In poultry several Chlamydia species have been detected, but Chlamydia psittaci and Chlamydia gallinacea appear to be most prevalent and important. Chlamydia psittaci is a well-known zoonosis and is considered to be a pathogen of poultry. Chlamydia gallinacea has been described more recently. Its avian pathogenicity and zoonotic potential have to be further elucidated. Within the Netherlands no data were available on the presence of Chlamydia on poultry farms. As part of a surveillance programme for zoonotic pathogens in farm animals, we investigated pooled faecal samples from 151 randomly selected layer farms. On a voluntary base, 69 farmers, family members or farm workers from these 151 farms submitted a throat swab. All samples were tested with a generic 23S Chlamydiaceae PCR followed by a species specific PCR for C. avium, C. gallinacea and C. psittaci. C. avium and psittaci DNA was not detected at any of the farms. At 71 farms the positive result could be confirmed as C. gallinacea. Variables significantly associated with the presence of C. gallinacea in a final multivariable model were ‘age of hens,’ ‘use of bedding material’ and ‘the presence of horses.’ The presence of C. gallinacea was associated with neither clinical signs, varying from respiratory symptoms, nasal and ocular discharges to diarrhoea, nor with a higher mortality rate the day before the visit. All throat swabs from farmers, family members or farm workers tested negative for Chlamydia DNA, giving no further indication for possible bird-to-human (or human-to-bird) transmission.
Marked increase in leptospirosis infections in humans and dogs in the Netherlands, 2014
Pijnacker, Roan ; Goris, M.G. ; Wierik, M.J. te; Broens, E.M. ; Giessen, J.W. van der; Rosa, M. de; Wagenaar, J.A. ; Hartskeerl, R.A. ; Notermans, D.W. ; Maassen, K. ; Schimmer, B. - \ 2016
Eurosurveillance 21 (2016)17. - ISSN 1025-496X - 7 p.

In the Netherlands, 97 human leptospirosis cases were notified in 2014. This represents a 4.6-fold increase in autochthonous cases (n = 60) compared with the annual average between 2010 and 2013. Most cases had symptom onset between June and November. This marked increase in humans coincided with an increase of leptospirosis in dogs. In 2014, 13 dogs with leptospirosis were reported, compared with two to six dogs annually from 2010 to 2013. The majority of the autochthonous cases (n = 20) were linked to recreational exposure, e.g. swimming or fishing, followed by occupational exposure (n = 15). About sixty per cent (n = 37) of the autochthonous cases were most likely attributable to surface water contact, and 13 cases to direct contact with animals, mainly rats. A possible explanation for this increase is the preceding mild winter of 2013–2014 followed by the warmest year in three centuries, possibly enabling rodents and Leptospira spp. to survive better. A slight increase in imported leptospirosis was also observed in Dutch tourists (n = 33) most of whom acquired their infection in Thailand (n = 18). More awareness and early recognition of this mainly rodent-borne zoonosis by medical and veterinary specialists is warranted.

The Dutch Q fever situation - Lessons learned?
Roest, H.I.J. ; Maassen, C.B.M. ; Giessen, A. van de; Zijderveld, F.G. van - \ 2014
Planet@Risk 2 (2014)3. - ISSN 2296-8172 - p. 166 - 168.
About 60 to 75% of the emerging infectious diseases are zoonotic. A special group of zoonotic diseases are these that are endemic but in a dormant state. A good example of such a disease is Q fever in the Netherlands. Before 2005, Q fever was known to be present in the human and animal populations but did not cause significant disease. This changed in 2005, when the first abortions in dairy goats were registered and in 2007 when the first human Q fever outbreak in the Netherlands was recorded. Between 2005 and 2009 abortions on 28 dairy goat farms and 2 dairy sheep farms were detected and between 2007 and 2010 about 4000 human cases were notified. This is recognised as the largest laboratory confirmed Q fever outbreak ever reported. To identify the cause of the human disease, genotyping of the causative Q fever agent Coxiella burnetii confirmed the epidemiological link between humans and dairy goats and sheep. Furthermore, an intergraded human-veterinary approach was needed to combat the outbreak. The need for such a One Health approach was also the conclusion of the official evaluation of the Q fever outbreak in the Netherlands. This resulted in a currently implemented national zoonosis structure with a signalling forum that meets monthly. This structure has already been helpful in assessing the human risk of the Schmallenberg virus outbreak.
Outsourcing child care, home cleaning and meal preparation
Cornelisse-Vermaat, J.R. ; Ophem, J.A.C. van; Antonides, G. ; Maassen van den Brink, H. - \ 2013
International Journal of Consumer Studies 37 (2013)5. - ISSN 1470-6423 - p. 530 - 537.
service economy - time - allocation - housework - labor - work - expenditures - food
In this paper, the outsourcing of child care, home cleaning and meal preparation is analysed by means of a socio-economic model that incorporates household-economic, life cycle, lifestyle and health variables. The data (n¿=¿700) were collected during a telephone survey in the Netherlands. About 10% of the households did not use any of the three outsourcing types. About 70 to 90% of households outsourced meal preparation at least once per month. In each household life cycle stage, the average monthly expenditures on outsourcing meal preparation were the highest of the three outsourcing categories. Factors affecting expenditures were generally the same for each type of outsourcing studied. In general, household economic variables including wage and working hours were unimportant in explaining the incidence and expenditures of outsourcing. The same holds for self-reported health. All expenditure types were affected by life cycle variables. There was an indication that a traditional lifestyle and traditional family type affected outsourcing expenditures negatively. Education appeared as an important factor: regardless of gender, both medium- and higher-educated people were more inclined to spend money on outsourcing than the lower educated. Especially, people younger than 44 years outsourced meal preparation. Outsourcing was neither restricted to nor especially practised by couples.
Spatiotemporal dynamics of emerging pathogens in questing Ixodes ricinus
Coipan, E.C. ; Jahfari, S. ; Fonville, M. ; Maassen, C.B. ; Giessen, J. van der; Takken, W. ; Takumi, K. ; Sprong, H. - \ 2013
Frontiers in Cellular and Infection Microbiology 3 (2013). - ISSN 2235-2988 - 11 p.
burgdorferi sensu-lato - geographic information-systems - human granulocytic ehrlichiosis - tick-borne diseases - borrelia-burgdorferi - anaplasma-phagocytophilum - lyme borreliosis - human babesiosis - europe - switzerland
Ixodes ricinus transmits Borrelia burgdorferi sensu lato, the etiological agent of Lyme disease. Previous studies have also detected Rickettsia helvetica, Anaplasma phagocytophilum, Neoehrlichia mikurensis, and several Babesia species in questing ticks in The Netherlands. In this study, we assessed the acarological risk of exposure to several tick-borne pathogens (TBPs), in The Netherlands. Questing ticks were collected monthly between 2006 and 2010 at 21 sites and between 2000 and 2009 at one other site. Nymphs and adults were analysed individually for the presence of TBPs using an array-approach. Collated data of this and previous studies were used to generate, for each pathogen, a presence/absence map and to further analyse their spatiotemporal variation. R. helvetica (31.1%) and B. burgdorferi sensu lato (11.8%) had the highest overall prevalence and were detected in all areas. N. mikurensis (5.6%), A. phagocytophilum (0.8%), and Babesia spp. (1.7%) were detected in most, but not all areas. The prevalences of pathogens varied among the study areas from 0 to 64%, while the density of questing ticks varied from 1 to 179/100 m². Overall, 37% of the ticks were infected with at least one pathogen and 6.3% with more than one pathogen. One-third of the Borrelia-positive ticks were infected with at least one other pathogen. Coinfection of B. afzelii with N. mikurensis and with Babesia spp. occurred significantly more often than single infections, indicating the existence of mutual reservoir hosts. Alternatively, coinfection of R. helvetica with either B. afzelii or N. mikurensis occurred significantly less frequent. The diversity of TBPs detected in I. ricinus in this study and the frequency of their coinfections with B. burgdorferi s.l., underline the need to consider them when evaluating the risks of infection and subsequently the risk of disease following a tick bite.
A bead-based suspension array for the serological detection of Trichinella in pigs
Wal, F.J. van der; Achterberg, R.P. ; Kant, A. ; Maassen, C.B.M. - \ 2013
The Veterinary Journal 196 (2013)3. - ISSN 1090-0233 - p. 439 - 444.
linked-immunosorbent-assay - multiplexed luminex assay - nonstructural proteins - antibodies - trichinosis - virus - spiralis - animals - serodiagnosis - immunoassay
The feasibility of using bead-based suspension arrays to detect serological evidence of Trichinella in pigs was assessed. Trichinella spiralis excretory–secretory antigen was covalently coupled to paramagnetic beads and used to bind serum antibodies, which were subsequently detected using anti-swine antibody. The assay was evaluated by testing pig sera from farms where trichinellosis was endemic and comparing the results with those obtained using two commercially available ELISAs. With cut-offs established by receiver operating characteristic (ROC) analysis, digestion-negative sera from a Trichinella-free population of pigs were deemed seronegative. When anti-swine antibody was replaced with protein A/G, higher test sensitivity (94% vs. 88%) at similar test specificity (95%), was achieved. The potential use of this assay in species other than swine was also demonstrated by testing human sera.
Bead-based suspension array for simultaneous detection of Antibodies against Rift Valley fever virus nucleocapsid protein N and glycoprotein Gn
Achterberg, R.P. ; Wal, F.J. van der; Boer, M. de; Boshra, H. ; Brun, A. ; Maassen, C.B.M. ; Kortekaas, J.A. - \ 2012
Bead-based suspension array for simultaneous detection of antiboedies against Rift Valley Fever virus nucleocapsid protein N and glycoprotein Gn
Achterberg, R.P. ; Wal, F.J. van der; Boer, M. de; Boshra, H. ; Brun, A. ; Maassen, C.B.M. ; Kortekaas, J.A. - \ 2012
Infectierisico’s van de veehouderij voor omwonenden
Maassen, C.B.M. ; Duijkeren, E. van; Duynhoven, Y.T.H.P. van; Dusseldorp, A. ; Geenen, P. ; Koeijer, A.A. de; Koopmans, M.P.G. ; Loos, F. ; Jacobs-Reitsma, W.F. ; Jonge, M. de; Giessen, A.W. van de - \ 2012
Bilthoven : RIVM - 65
veehouderij - zoönosen - q-koorts - volksgezondheid - infectieziekten - livestock farming - zoonoses - q fever - public health - infectious diseases
Momenteel kunnen er geen wetenschappelijk onderbouwde uitspraken worden gedaan over het infectierisico van omwonenden van veehouderijen, met uitzondering van Q-koorts. Het is aangetoond dat omwonenden van melkgeitenbedrijven met Q-koorts, een verhoogd risico hebben om deze infectieziekte te krijgen. Voor de overige zoönosen (infectieziekten die van dier op mens worden overgedragen) zijn onvoldoende gegevens beschikbaar over het risico in relatie tot de afstand tot veehouderijen, het bedrijfstype en de bedrijfsgrootte. Wel is bekend dat veehouders, medewerkers op veehouderijen en dierenartsen een verhoogd risico hebben om bepaalde zoönosen op te lopen. Direct contact met dieren is daarbij vaak een risicofactor.
Bead-based suspension array for simultaneous detection of antibodies against the Rift Valley fever virus nucleocapsid and Gn glycoprotein
Wal, F.J. van der; Achterberg, R.P. ; Boer, S.M. de; Boshra, H. ; Brun, A. ; Maassen, C.B.M. ; Kortekaas, J.A. - \ 2012
Journal of Virological Methods 183 (2012)2. - ISSN 0166-0934 - p. 99 - 105.
linked-immunosorbent-assay - domestic ruminants - indirect elisa - igm antibodies - capture elisa - nss protein - n-protein - humans - validation - sandwich
A multiplex bead-based suspension array was developed that can be used for the simultaneous detection of antibodies against the surface glycoprotein Gn and the nucleocapsid protein N of Rift Valley fever virus (RVFV) in various animal species. The N protein and the purified ectodomain of the Gn protein were covalently linked to paramagnetic Luminex beads. The performance of the resulting multiplex immunoassay was evaluated by testing a comprehensive and well-characterized panel of sera from sheep, cattle and humans. The suitability of this multiplex immunoassay to differentiate infected from vaccinated animals (DIVA) was investigated by testing sera from lambs vaccinated with a paramyxovirus vaccine vector expressing the RVFV surface glycoproteins Gn and Gc. The results suggest that the bead-based suspension array can be used as a DIVA assay to accompany several recently developed experimental vaccines that are based on RVFV glycoproteins, and are devoid of the N protein.
Prevalence of Coxiella Burnetii in Ticks After a Large Outbreak of Q Fever
Sprong, H. ; Tijsse-Klasen, E. ; Langelaar, M. ; Bruin, A. de; Fonville, M. ; Gassner, F. ; Takken, W. ; Wieren, S.E. van; Nijhof, A. ; Jongejan, F. ; Maassen, C.B.M. ; Scholte, E.J. ; Hovius, J.W. ; Emil Hovius, K. ; Spitalska, E. ; Duynhoven, Y.T. van - \ 2012
Zoonoses and Public Health 59 (2012)1. - ISSN 1863-1959 - p. 69 - 75.
ixodes-ricinus ticks - netherlands - slovakia - infection - animals - transmission - pathogens - anaplasma - borrelia - agent
Q fever has emerged as an important human and veterinary public health problem in the Netherlands with major outbreaks in three consecutive years. Goat farms are probably the prime source from which Coxiella burnetii have spread throughout the environment, infecting people living in the vicinity. Coxiella burnetii infection not only spilled over from animal husbandry to humans but could also have spread to neighbouring wildlife and pets forming novel reservoirs and consequently posing another and lingering threat to humans, companion animals and livestock. In these cases, transmission routes other than airborne spread of contaminated aerosols may become significant. Therefore, the role of ticks in the transmission of Coxiella burnetii in the current situation was investigated. A total of 1891 questing Ixodes ricinus ticks and 1086 ticks feeding on pets, wildlife and livestock were tested by a recently developed multiplex Q-PCR. All ticks were negative, except for a few ticks feeding on a herd of recently vaccinated sheep. Coxiella-positive ticks were not detected after resampling this particular herd three months later. Based on these data we conclude that the current risk of acquiring Q fever from questing ticks in the Netherlands is negligible. However, for future risk assessments, it might be relevant to sample more ticks in the vicinity of previously C. burnetii infected goat farms and to assess whether C. burnetii can be transmitted transovarially and transstadially in I. ricinus ticks.
Development of a serological Luminex assay for Trichinella and Salmonella in swine
Wal, F.J. van der; Achterberg, R.P. ; Maassen, C.B.M. - \ 2011
- 4 p.
In order to develop veterinary serological multiplex assays, a singleplex bead-based array on the Luminex platform was developed, and with this experience the study was expanded by building a multiplex serological assay. First a serological Luminex assay was developed for Trichinella in swine. As the developed assay performed comparable to commercial ELISA’s, work on this platform was continued by developing a serological multiplex assay for Salmonella in swine. This assay is based on five LPS variants of the most important serogroups occurring in pigs. The serological multiplex assay for Salmonella performed comparable to a commercial ELISA. The results from this study demonstrate the feasibility of the Luminex platform for multiplex serology. Ultimately, this type of assay can be used for routine screening of porcine serum samples for immune responses against multiple pathogens in one assay.
Outsourcing childcare, home cleaning and meal preparation
Cornelisse-Vermaat, J.R. ; Ophem, J.A.C. van; Antonides, G. ; Maassen van den Brink, H. - \ 2011
In this paper the outsourcing of childcare, home cleaning and meal preparation is analysed by means of a socio-economic model that incorporates household-economic, lifecycle, lifestyle and health variables. The data (n= 700) was collected during a telephone survey in the Netherlands. About 10 per cent of the households did not use any of the three forms of outsourcing. About 70 to 90 per cent of households outsourced meal preparation. In any household type, the average monthly expenditures on outsourcing meal preparation were the highest of the three outsourcing categories. In the data analysis a Heckman selection model was applied. Factors affecting different outsourcing expenditures were generally the same for each type of outsourcing studied . Household economic variables as wage and working hours were in general not important in explaining the incidence and expenditures of outsourcing. The same hold for health. Childcare expenditures were also affected positively by life-cycle variables. There was an indication that a traditional lifestyle and traditional family type affected outsourcing expenditures negatively. Education appeared as an important taste shaper: regardless of gender, both medium and higher educated people were more inclined to spend money on outsourcing than the lower educated. Especially people younger than 44 years outsourced meal preparation. Outsourcing was neither restricted to nor especially practised by couples.
Application of protein antigens in a multiplex Luminex xMap assay for serodiagnosis of Mycobacterium avium subsp. paratuberculosis infections in dairy cattle
Wisselink, H.J. ; Smits, C.B. ; Achterberg, R.P. ; Peters, J. ; Bergervoet, J.H.W. ; Kant, A. ; Riepema, K.H. ; Willemsen, P.T.J. ; Bakker, D. ; Maassen, C.B.M. - \ 2010
Bladschimmelbestrijding suikerbieten
Meuffels, G.J.H.M. ; Maassen, Jurgen - \ 2010
Gewasbescherming 41 (2010)2. - ISSN 0166-6495 - p. 71 - 72.
suikerbieten - fungiciden - cercospora - roestziekten - meeldauw - ramularia - veldproeven - ziektebestrijding - consultancy - sugarbeet - fungicides - cercospora - rust diseases - mildews - ramularia - field tests - disease control - consultancy
Het heeft geen zin om bladschimmels te bestrijden als er nog geen aantasting door de ziekten Cercospora, roest, echte meeldauw of ramularia wordt aangetroffen. IRS ontwikkelde samen met Opticrop/Agrovision een bladschimmeladviesmodel dat telers helpt om de suikerbieten op kritieke momenten te inspecteren en zo het juiste moment van spuiten nauwkeurig te bepalen. Pas als er sprake is van aantasting, wordt overgegaan tot het uitvoeren van een bestrijding. Naar verwachting spuiten telers hierdoor effectiever, en uiteindelijk ook minder vaak. Het gebruik van gewasbeschermingsmiddelen zal hierdoor afnemen, wat goed is voor de portemonnee van de ondernemer en minder milieubelasting veroorzaakt.
The influence of regulatory fit on evaluation and intentions to buy genetically modified foods: The mediating role of social identification
Fransen, M.L. ; Reinders, M.J. ; Bartels, J. ; Maassen, R.L. - \ 2010
Journal of Marketing Communications 16 (2010)1. - ISSN 1352-7266 - p. 5 - 20.
The present study examines how communicated messages could be effective in affecting consumers' attitudes and behavioural intentions regarding genetically modified (GM) foods. Based on Regulatory Focus Theory, it was hypothesized that exposure to a communication message matching a consumer's regulatory orientation (i.e. regulatory fit) leads to more positive attitudes and greater willingness to buy GM foods than exposure to a communication message that does not match with consumer's regulatory orientation. Moreover, it was expected that social identification with the consumer of GM foods mediates the relationship between both regulatory fit and attitudes and regulatory fit and behavioural intentions. The results support our hypotheses by showing that communicated messages that are congruent (vs incongruent) with consumers' regulatory orientations enhanced social identification with the consumer of GM foods, which, in turn, positively affected attitudes and behavioural intentions. Management implications for designing informative messages regarding GM foods are discussed.
Amino acid sequences directed against envelope proteins of a virus and polypeptides comprising the same for the treatment of viral diseases
Hultberg, A. ; Maassen, C.B.M. ; Landschoot, P. ; Depla, E. ; Stortelers, C. ; Verrips, C.T. ; Gucht, S. ; Melera, J. ; Saunders, M.J. ; Haard, J.J.W. ; Weiss, R.A. ; temperton, N.J. ; Saelens, X. ; Schepens, B. ; Szyroki, A. ; Harmsen, M.M. - \ 2009
Octrooinummer: WO2009147248, verleend: 2009-06-05.
The present invention relates in part to amino acid sequences that are directed against and/or that can specifically bind to an envelope protein of a virus, as well as to compounds or constructs, and in particular proteins and polypeptides, that comprise or essentially consist of one or more such amino acid sequences.
Time allocation and outsourcing within households : differences in lifestyle between native Dutch and immigrants in the Netherlands
Cornelisse-Vermaat, J.R. ; Maassen van den Brink, H. ; Ophem, J.A.C. van; Antonides, G. - \ 2009
In: Outsourcing, Teamwork and Business Management / Carettas, K.E., Nova Science. Nova Publishers (Management Science - Theory and Applications ) - ISBN 9781604569568 - p. 135 - 166.
Strain-dependent effects of probiotic lactobacilli on EAE autoimmunity
Maassen, C.B.M. ; Claassen, E. - \ 2008
Vaccine 26 (2008)17. - ISSN 0264-410X - p. 2056 - 2057.
antigens
In this study we present new data showing strain-specific differences on the effect of commercially available probiotic drinks in an EAE rat autoimmune model for multiple sclerosis. In this particular model, we conclude that these drinks do not enhance but rather suppress the disease. We suggest that conclusions on probiotics are limited to specific strains and models and not generalised. We further suggest that physiological use (normal route, normal dose, normal growth phase, specific strain or substrain/species) is studied in all. cases, so as not to overwhelm (high dose) or circumvent natural immune processing.
Biobrood van eigen bodem: een ketenproject
Postma, R. ; Bakker, A. den; Derksen, V. ; Kruiger, K. ; Maassen, J. ; Osman, A.M. ; Schepers, H.E. - \ 2008
Wageningen [etc.] : Nutriënten Management Instituut (Rapport / NMI 1136) - 30
biologische voedingsmiddelen - graanproducten - brood - landbouwplantenteelt - akkerbouw - ketenmanagement - regionale voedselketens - organic foods - cereal products - bread - crop husbandry - arable farming - supply chain management - regional food chains
In 2007 is het ketenproject “Biobrood van eigen bodem” uitgevoerd in het kader van het coinnovatieprogramma biologische afzetketens. Het betrof een samenwerkingsproject van een aantal ketenpartijen uit de biologische broodketen en een aantal kennisinstellingen. Het doel van het project was gericht op het verbeteren van het imago van biologisch brood door het verhogen van het aandeel Nederlandse tarwe, wat mogelijk een bijdrage kan leveren aan het vergroten van de afzetmogelijkheden ervan. Daartoe is een consumentenonderzoek uitgevoerd en zijn veldproeven met bemestingsvarianten uitgevoerd. Tenslotte zijn met de tarwe uit de veldproeven bakproeven uitgevoerd.
Vergeten soorten, nieuwe marktpotenties : naar een nieuw ketenconcept voor biologische komkommer
Poot, E.H. ; Berg, I. van den; Dooijeweert, W. van; Janse, J. ; Zeelenberg, A. ; Kögeler, G. ; Reijers, A. ; Maassen, E. - \ 2008
Wageningen : Wageningen UR Glastuinbouw (Nota / Wageningen UR, Glastuinbouw 497) - 38
komkommerachtige gewassen - komkommers - vruchtgroenten - rassen (planten) - zeldzame rassen - marketing - vercommercialisering - biologische landbouw - consumentenonderzoeken - landbouwplantenteelt - selectie - glastuinbouw - ketenmanagement - glasgroenten - cucurbit fruits - cucumbers - fruit vegetables - varieties - rare breeds - marketing - commercialization - organic farming - consumer surveys - crop husbandry - selection - greenhouse horticulture - supply chain management - greenhouse vegetables
In het project 'Vergeten soorten, nieuwe marktpotenties' is gezocht naar een onderscheidend komkommertype, dat appelleert aan positieve associaties van de consument bij 'vergeten groenten':authentiek, puur, nostalgie. In het project zijn 58 soorten komkommers en komkommerachtigen van over de gehele wereld verzameld, waaruit na twee teeltproeven 10 soorten zijn geselecteerd, die voor consumentenonderzoek gebruikt zijn. Uiteindelijk waren er twee rassen die voor marktintroductie in aanmerking kwamen en werden er marketingconcepten bedacht. De rassen kregen de namen 'Oerkomkommer' en 'Lentekomkommer'.
Campylobacter On Site Test for Chicken Feces
Wal, F.J. van der; Post, J. ; Dijkstra, J. ; Amerongen, A. van; Wichers, J. ; Maassen, K. - \ 2008
The Dutch Salmonella monitering programme for pigs and some recommendations for control plans in the future
Hanssen, E.J.M. ; Swanenburg, M. ; Maassen, C.B.M. - \ 2007
Serological SPR assay for the detection of Trichinella antibodies in pigs evaluated against other assays by Bayesian statistics.
Maassen, C.B.M. ; Achterberg, R.P. ; Haughey, S. ; Areskoug, D. ; Engel, B. ; Giessen, J. van der; Fonville, M. ; Teunis, P. ; Wolf, P.J. van der; Molina, V. ; Larrieu, E. ; Peralta, J.L. ; Dopfer, D.D.V. - \ 2007
Campylobacter on site test
Wal, F.J. van der; Post, J. ; Maassen, C.B.M. - \ 2007
Lelystad : Animal Sciences Group (Rapport / Animal Sciences Group 07/100521)
Evaluation of serological test for Trichinella infections in pigs
Maassen, C.B.M. ; Achterberg, R.P. ; Engel, B. ; Giessen, J. van der; Teunis, P. ; Heijden, H.M.J.F. van der; Haughey, S. ; Molina, V. ; Peralta, J.L. ; Döpfer, D. - \ 2007
In: Proceedings of 7th International Safepork Symposium, 9 - 11 May, 2007, Verona, Italy. - Padova, Italie : CLEUP - ISBN 9788861290839 - p. 211 - 213.
Development of an assay to detect CSFV employing surface plasmon resonance
Bloemraad, M. ; Maneschijn-Bonsing, J.G. ; Hakze-van der Honing, R.W. van der; Maassen, C.B.M. ; Bruin, M. de - \ 2007
In: Proceedings of the 6th Pestiviruses Symposium, 13 - 16 September, 2005, Thun, Switzerland. - - p. 100 - 100.
Ethnic Differences in Lifestyle and Overweight in The Netherlands
Cornelisse-Vermaat, J.R. ; Maassen van den Brink, H. - \ 2007
Obesity 15 (2007)2. - ISSN 1930-7381 - p. 483 - 493.
obesity - prevalence - smoking - weight - trends
Objective: To study the effects of lifestyle variables and socioeconomic status on overweight among native Dutch and immigrants in The Netherlands. Research Methods and Procedures: Data were used from a survey sample (N = 2551) of native Dutch and immigrant respondents (Surinamese/Antilleans, Turks, and Moroccans). BMI was calculated using self-reported weight and height. Lifestyle variables such as modern food habits (take-out food and eating out) and participating in sports were included, as well as socioeconomic and demographic background variables. Bivariate and ordinary least squares analyses were performed to study BMI and the determinants of overweight among the different groups. Results: All immigrant groups had a higher prevalence of overweight than the Dutch, except Moroccans. Men were overweight more frequently than women. Take-out food, eating out, and fresh vegetables were related to a decrease in BMI, whereas convenience foods were related to an increase in BMI. For ready-to-eat meals, the results were mixed. In all groups, age was associated with a higher BMI, and a higher level of education was associated with a lower BMI. Immigrants participated in sports less frequently than native Dutch people. Discussion: One percent to 5% of the total public health costs can be attributed to costs for overweight-related diseases. Public health policies should aim at stimulating healthy lifestyles and discouraging bad food habits through higher taxes on high-calorie foods. In particular, Dutch immigrants should be encouraged to lose weight, because they have a higher risk for overweight-related diseases. Key Words: BMI ¿ ethnicity ¿ food habits ¿ outsourcing ¿ socioeconomic status
Outsourcing meal preparation
Cornelisse-Vermaat, J.R. ; Antonides, G. ; Ophem, J.A.C. van; Maassen van den Brink, H. - \ 2007
In: Understanding consumers of food products Cambridge : Woodhead Publishing Limited - ISBN 9781845690090 - p. 221 - 235.
A Luminex xMAP assay for serodiagnosis of Mycobacterium avium subsp. paratuberculosis infections in dairy cattle
Wisselink, H.J. ; Smits, C.B. ; Achterberg, R.P. ; Peters, J. ; Bergervoet, J.H.W. ; Kant, A. ; Riepema, K.H. ; Willemsen, P.T.J. ; Bakker, D. ; Maassen, Kitty B.M. - \ 2006
Central Veterinary Institute
Ontwikkeling Biacore-test Salmonella antilichamen t.b.v. monitoring voedselveiligheid in de Pluimveevleesketen
Swanenburg, M. ; Achterberg, R.P. ; Maassen, K. ; Bloemraad, M. - \ 2006
Lelystad : Animal Sciences Group (Rapport / Animal Sciences Group ) - 16
voedselveiligheid - pluimvee - pluimveevlees - zoönosen - biosensoren - testen - antilichamen - food safety - poultry - poultry meat - zoonoses - biosensors - testing - antibodies
In programma 389 (Zoönosen) is onderzoek uitgevoerd naar de mogelijkheden van snelle testen voor de monitoring van de voedselveiligheid in de pluimveevleesketen, waarbij meerdere, verschillende tests kunnen worden uitgevoerd op hetzelfde monster in dezelfde test-run. Hierbij werd gebruik gemaakt van biosensortechnologie (Biacore). De doelstelling van dit project was de verregaande ontwikkeling, inclusief het inbouwen van serogroep C, en validatie van een snelle test voor het aantonen van antilichamen tegen salmonella in het serum van vleeskuikens, waarbij gebruik wordt gemaakt van een Biacore biosensor
De detectie van een laag prevalente infectie in het kader van een surveillance systeem
Dopfer, D. ; Maassen, C.B.M. ; Giessen, J.W.B. van der; Teunis, P. ; Jong, M.C.M. de; Buist, W. ; Engel, B. - \ 2006
Lelystad : Animal Sciences Group (Rapport / Animal Sciences Group ) - 27
trichinella - varkens - testen - slachtdieren - trichinella spiralis - trichinella - pigs - testing - meat animals - trichinella spiralis
Adviezen en opmerkingen voor het project: 'validatie van serologische testen met het doel om de surveillance op Trichinella in Nederlandse slachtvarkens te optimaliseren'
Diagnostic test evaluation for Trichinella infections in pigs: a renewed interaction between diagnostic test data and their statistical analysis
Dopfer, D.D.V. ; Maassen, C.B.M. ; Achterberg, R.P. ; Giessen, J.W.B. van der; Teunis, P. ; Buist, W.G. ; Molina, V. ; Guarnera, E. ; Gonzales, M. ; Krivokapich, S. ; Rodriguez, M. ; Peralta, J.L. ; Trabattoni, H. ; Larrieu, E. ; Engel, B. - \ 2006
To evaluate the usefulness of serological tests applied to monitor Trichinella free herds, Bayesian methodology was used to estimate the diagnostic test parameters: sensitivity, specificity and prevalence in the absence of a Gold Standard test. In the absence of Dutch serum samples for positive pigs, it is discussed how the diagnostic test parameters derived from panels of sera originating from regions with endemic Trichinellosis in Argentina can be used to estimate the test parameters.
Body mass index, perceived health, and happiness: their determinants and structural relationships
Cornelisse-Vermaat, J.R. ; Antonides, G. ; Ophem, J.A.C. van; Maassen van den Brink, H. - \ 2006
Social Indicators Research 79 (2006)1. - ISSN 0303-8300 - p. 143 - 158.
quality-of-life - economic disadvantage - obesity - women - men - overweight - consequences - population - prevalence - weight
The structural relationships between body mass index, perceived health and happiness have been studied in a survey of 700 native Dutch citizens. We found an indirect effect of body mass index on happiness, via perceived health. Age had an inverted U-shaped relationship with body mass index, and both education and smoking had a negative effect on body mass index. Being married, doing paid work, owning a house, and doing sports had positive effects on perceived health, suggesting that living a regular life may lead to a better perceived health. Being married positively affected happiness. The other socio-demographic variables either had no effects on happiness or indirect effects via body mass index and perceived health.
Development of a 5-plex assay for the monitoring of broiler flock
Maassen, C.B.M. ; Bergervoet, J.H.W. - \ 2006
Wageningen : Plant Research International (PRI)
Detecting Salmonella antibodies in pork
Achterberg, R.P. ; Maneschijn-Bonsing, J.G. ; Bloemraad, M. ; Swanenburg, M. ; Maassen, C.B.M. - \ 2005
New Food 8 (2005)4. - ISSN 1461-4642 - p. 56 - 58.
Using Biacore for the detection of antibodies against Salmonella in a monitoring program for pigs
Achterberg, R.P. ; Maneschijn-Bonsing, J.G. ; Bloemraad, M. ; Swanenburg, M. ; Maassen, C.B.M. - \ 2005
Biacore journal 5 (2005)1. - p. 16 - 18.
Detecting Salmonella in pork
Achterberg, K. van; Maneschijn-Bonsing, J.G. ; Bloemraad, M. ; Swanenburg, M. ; Maassen, C.B.M. - \ 2005
New Food 4 (2005). - ISSN 1461-4642 - p. 56 - 57.
Using a Biacore assay for the detection of antibodies against Salmonella in a monitoring program for pigs
Achterberg, R. ; Maneschijn-Bonsing, J.G. ; Bloemraad, M. ; Swanenburg, M. ; Maassen, C.B.M. - \ 2005
Biacore journal 5 (2005). - p. 16 - 18.
Validation of a surface plasmon resonance based assay to detect Salmonella antibodies in serum of pigs
Swanenburg, M. ; Bloemraad, M. ; Achterberg, R.P. ; Maassen, C.B.M. - \ 2005
In: Proceedings of the 6th International Symposium on the Epidemiology and Control of Foodborne Pathogens in Pork., California, 6-9 September 2005. - California : - p. 100 - 102.
The demand for health: differences between the native Dutch and immigrants in the Netherlands
Cornelisse-Vermaat, J.R. ; Maassen van den Brink, H. - \ 2005
In: The Economics of Health Reforms / Yfantopoulos, J.N., Athens, Greece : ATINER - ISBN 9608867207 - p. 283 - 309.
De prijs van overgewicht
Cornelisse-Vermaat, J.R. ; Maassen van den Brink, H. ; Groot, W.N.J. - \ 2005
In: Jaarboek Koninklijke Vereniging voor de Staathuishoudkunde 2004/2005 Utrecht : LEMMA/ESB - p. 143 - 148.
Household production, health, and happiness : a comparison of the native Dutch and non-western immigrants in the Netherlands
Cornelisse-Vermaat, J.R. - \ 2005
Wageningen University. Promotor(en): H. Maassen van den Brink; Gerrit Antonides, co-promotor(en): Johan van Ophem. - Wageningen : - ISBN 9085041473 - 209
huishoudens - gezondheid - welstand - gezinnen - overgewicht - immigranten - nederland - welzijn - households - health - wellness - families - overweight - immigrants - netherlands - well-being
De Vraag naar gezondheid: verschillen tussen allochtonen en autochtonen in Nederland
Cornelisse-Vermaat, J.R. ; Maassen van den Brink, H. - \ 2004
In: Nederlands Congres Volksgezondheid 2004, Rotterdam, The Netherlands, 14-15 April 2004. - - p. 60 - 60.
Overweight and food habits in the Netherlands : a study on differences between native Dutch and immigrants
Cornelisse-Vermaat, J.R. ; Maassen van den Brink, H. - \ 2004
In: Migrant Health in Europe Champlain : Carfax Publishing Taylor & Francis Group - p. S90 - S91.
Obesity
Vermaat, J.R. ; Maassen van den Brink, H. - \ 2004
In: Migrant Health in Europe. - Champlain USA : Carfax Publishing Taylor & Francis - p. 90 - 91.
The demand for health: differences between native Dutch and immigrants in the Netherlands
Cornelisse-Vermaat, J.R. ; Maassen van den Brink, H. - \ 2004
In: Migrant Health in Europe,. - Champlain (USA) : Carfax Publishing Taylor & Francis Group - p. 109 - 109.
Overgewicht en voedingsgewoonten in Nederland. Een studie naar verschillen tussen autochtonen en allochtonen in Nederland
Cornelisse-Vermaat, J.R. ; Maassen van den Brink, H. - \ 2004
In: Nederlands Congres Volksgezondheid 2004. - Houten : Bohn Stafleu van Loghum - p. 59 - 59.
Growth phase of orally administered Lactobacillus strains differentially affects T helper-cell pathways
Maassen, C.B.M. ; Boersma, W.J.A. ; Holten-Neelen, J.C.P.A. van; Claassen, E.A.W. ; Laman, J.D. - \ 2003
Vaccine 21 (2003)21-22. - ISSN 0264-410X - p. 2751 - 2757.
toxin fragment-c - t-helper-cell - multiple-sclerosis - mice - responses - tetanus - casei - expression - cytokines - tolerance
Lactobacillus strains with probiotic activity are major constituents of numerous common food products. Due to their `generally regarded as safe¿-status (GRAS-status), Lactobacillus strains can also be genetically engineered for use in oral immunotherapeutic applications, such as vaccination and T lymphocyte tolerance induction in autoimmune disease. In the current study, we demonstrate that the growth phase of orally administered individual Lactobacillus strains can differentially affect antigen-specific antibody subclasses IgG1 and IgG2a, which might reflect skewing of systemic activity of T helper cell type 2 (Th2) and T helper cell type 1 (Th1) pathways, respectively. Mice were orally fed different wild type Lactobacillus strains in log phase or stationary phase and immunized intraperitoneally with a T-cell dependent protein antigen. Sera were evaluated for the ratio of antigen-specific IgG1 and IgG2a antibodies. Stationary Lactobacillus murines and Lactobacillus casei cultures, but not two other Lactobacillus strains, evoked significantly higher IgG1/IgG2a ratios than log phase cultures, possibly relating to increased activity of the Th2-pathway. Despite normal variation in antibody responses against TNP¿CGG among individual mice, a high correlation was found between the IgG1 and IgG2a responses of mice within experimental groups. This differential antibody response is likely due to growth phase-dependent differences in bacterial cell composition. Since Lactobacillus growth phase dependent skewing of antibody responses possibly reflecting T-cell pathways can inadvertently affect allergic and (auto)-immune responses, the current findings strongly caution against unidimensional views on the oral administration of individual Lactobacillus strains for probiotic or immunotherapeutic purposes, but also suggest additional possibilities for immune modulation.
Reduced experimental autoimmune encephalomyelitis after intranasal and oral administration of recombinant lactobacilli expressing meyelin antigens
Maassen, C.B.M. ; Holten-Neelen, J.C.P.A. van; Groenewegen, L. ; Hoogteijling, L. ; Visser, L. ; Boersma, W.J.A. - \ 2003
Vaccine 21 (2003)32. - ISSN 0264-410X - p. 4685 - 4693.
experimental allergic encephalomyelitis - nasal tolerance induction - toxin fragment-c - t-cell epitope - basic-protein - lewis rats - encephalitogenic peptide - multiple-sclerosis - mucosal tolerance - retinal antigens
Oral administration of autoantigens is a safe and convenient way to induce peripheral T-cell tolerance in autoimmune diseases like multiple sclerosis (MS). To increase the efficacy of oral tolerance induction and obviate the need for large-scale purification of human myelin proteins, we use genetically modified lactobacilli expressing myelin antigens. A panel of recombinant lactobacilli was constructed producing myelin proteins and peptides, including human and guinea pig myelin basic protein (MBP) and proteolipid protein peptide 139¿151 (PLP139¿151). In this study we examined whether these Lactobacillus recombinants are able to induce oral and intranasal tolerance in an animal model for multiple sclerosis, experimental autoimmune encephalomyelitis (EAE). Lewis rats received soluble cell extracts of Lactobacillus transformants intranasally three times prior to induction of EAE. For the induction of oral tolerance, rats were fed live transformed lactobacilli for 20 days. Ten days after the first oral administration EAE was induced. Intranasal administration of extracts containing guinea pig MBP (gpMBP) or MBP72¿85 significantly inhibited EAE in Lewis rats. Extracts of control transformants did not reduce EAE. Live lactobacilli expressing guinea pig MBP72¿85 fused to the marker enzyme ß-glucuronidase (ß-gluc) were also able to significantly reduce disease when administered orally. In conclusion, these experiments provide proof of principle that lactobacilli expressing myelin antigens reduce EAE after mucosal (intranasal and oral) administration. This novel method of mucosal tolerance induction by mucosal administration of recombinant lactobacilli expressing relevant autoantigens could find applications in autoimmune disease in general, such as multiple sclerosis, rheumatoid arthritis and uveitis.
De Prijs van Overgewicht
Cornelisse-Vermaat, J.R. ; Maassen van den Brink, H. ; Groot, W. de - \ 2003
ESB Economisch Statistische Berichten 88 (2003)4395. - ISSN 0013-0583 - p. 92 - 94.
obesitas - overgewicht - overeten - voedingsstoornissen - kosten van de gezondheidszorg - gezondheidszorg - gezondheidsbeleid - voeding - nederland - obesity - overweight - overeating - nutritional disorders - health care costs - health care - health policy - nutrition - netherlands
In Nederland zijn steeds meer mensen te dik. Mensen met overgewicht lopen grotere gezondheidsrisico's en de kosten voor gezondheidszorg nemen erdoor toe. Tijd voor een 'snack tax'?
Androgenesis in Brassica: A model system to study the initiation of plant embryogenesis
Custers, J.B.M. ; Cordewener, J.H.G. ; Fiers, M.A. ; Maassen, B.T.H. ; Lookeren Campagne, M.M. van; Liu, C.M. - \ 2001
In: Current Trends in the Embryology of Angiosperms 19 / Bhojwani, S.S., Soh, W.Y., Dordrecht : Kluwer - p. 451 - 470.
Lusten en Lasten. Over Economie en Emotie
Maassen, H. van den; Groot, W. de - \ 2000
Amsterdam : Prometheus - ISBN 9789053338704 - 176 p.
Een zorg minder?
Maassen, H. van den; Groot, W. de - \ 2000
ESB Economisch Statistische Berichten 85 (2000)4266. - ISSN 0013-0583 - p. 611 - 612.
arbeidseconomie - arbeidsmarkt - secundaire arbeidsvoorwaarden - kostenanalyse - arbeidsverdeling - verlof - zorg - financieren - vrouwenemancipatie - labour economics - labour market - fringe benefits - cost analysis - division of labour - leave - care - financing - emancipation of women
Over de kosten van langdurig zorgverlof en de effecten op het arbeidsaanbod en de werkgelegenheid
Modulation of cytokine expression by lactobacilli, and its possible therapeutic use
Maassen, C.B.M. ; Laman, J.D. ; Boersma, W.J.A. ; Claassen, E. - \ 2000
In: Probiotics 3 : Immunomodulation by the gut microflora and probiotics / Fuller, R., Perdigon, G., Dordrecht : Kluwer Academic Publ - ISBN 9780792362449 - p. 176 - 192.
Liefde voor de economie: over lusten en lasten : rede ter gelegenheid van de 368ste Dies Natalis van de Universiteit van Amsterdam
Maassen, H. van den - \ 2000
Amsterdam : Vossius Press AUP - ISBN 9789056291150 - 33 p.
De sociaal-economische emancipatie index : een voorstudie voor een monitor-onderzoek naar de sociaal-economische positie van vrouwen en mannen in Nederland
Maassen, H. van den; Groot, W. - \ 1999
Den Haag : Ministerie van Sociale Zaken en Werkgelegenheid - ISBN 9789057492655 - 58
vrouwen - mannen - positie van de vrouw - arbeid (werk) - inkomen - arbeidsmarkt - Nederland - economische situatie - emancipatie - vrouwenemancipatie - gelijke behandeling van de vrouw - women - men - woman's status - labour - income - labour market - Netherlands - economic situation - emancipation - emancipation of women - female equality
Boekrecentie van H. Bos en Th. Sandfort (1998) 'Seksuele voorkeur en werk : Een vergelijking tussen homo- en heteroseksuele personen'
Maassen, H. van den - \ 1999
Tijdschrift voor Seksuologie 23 (1999)september. - p. 170 - 171.
Is er een tekort aan technisch-opgeleiden?
Groot, W. ; Maassen, H. van den; Oosterbeek, H. ; Plug, E. ; Webbink, D. - \ 1999
Den Haag : Welboom - ISBN 9789071667565 - 92 p.
Naschrift
Groot, W. ; Maassen, H. van den; Plug, E. - \ 1999
ESB Economisch Statistische Berichten 84 (1999)4234. - ISSN 0013-0583 - p. 919 - 919.
Geen tekort aan technisch opgeleiden
Groot, W. ; Maassen, H. van den; Plug, E. - \ 1999
ESB Economisch Statistische Berichten 84 (1999)4216. - ISSN 0013-0583 - p. 608 - 610.
De arbeidsmarktperspectieven van technisch-opgeleide mannen in Nederland
Groot, W. ; Maassen, H. van den; Plug, E. - \ 1999
In: Is er een tekort aan technisch-opgeleiden? / Groot, Wim, Maassen van den Brink, Henriëtte, Oosterbeek, Hessel, Plug, Erik, Webbink, Dinand, Den Haag : Welboom - ISBN 9789071667565 - p. 56 - 66.
Inleiding
Groot, W. ; Maassen, H. van den; Plug, E. - \ 1999
In: Is er een tekort aan technisch-opgeleiden? / Groot, Wim, Maassen van den Brink, Henriëtte, Oosterbeek, Hessel, Plug, Erik, Webbink, Dinand, Den Haag : Welboom - ISBN 9789071667565 - p. 7 - 18.
De effectiviteit van het beroepsonderwijs in Nederland
Groot, W. ; Maassen, H. van den; Plug, E. - \ 1999
In: Is er een tekort aan technisch-opgeleiden? / Groot, Wim, Maassen van den Brink, Henriëtte, Oosterbeek, Hessel, Plug, Erik, Webbink, Dinand, Den Haag : Welboom - ISBN 9789071667565 - p. 43 - 55.
Overpayment and earnings satisfaction : an application of an ordered tobit model
Groot, W. ; Maassen, H. van den - \ 1999
Applied Economics Letters 6 (1999)4. - ISSN 1350-4851 - p. 235 - 238.
In this paper an ordered response Tobit model is specified to determine the effects of absolute wages and relative overpayment on satisfaction with earnings. The joint estimations of wages and satisfaction with earnings allows us to disentangle the effects of relative and absolute wages on satisfaction with earnings. The model is estimated on two different data sets. All estimations show that satisfaction with earnings is determined by relative wages rather than by absolute wage levels. The results may have implications for pay policies of firms
Job satisfaction and preference drift
Groot, W. ; Maassen, H. van den - \ 1999
Economics Letters 63 (1999). - ISSN 0165-1765 - p. 363 - 367.
Job satisfaction of older workers
Groot, W. ; Maassen, H. van den - \ 1999
International journal of manpower 6 (1999). - ISSN 0143-7720 - p. 343 - 360.
Zorgen om Zorgverlof
Groot, W. ; Maassen, H. van den - \ 1999
Unknown Publisher - 17 p.
Meekijken in de glazen bol van het ROA
Groot, W. ; Maassen, H. van den - \ 1999
Unknown Publisher - 13 p.
De mythe van de zielige man
Groot, W. ; Maassen, H. van den - \ 1999
In: Die tijd komt nooit meer terug : De arbeidsmarkt aan het eind van de eeuw / Godschalk, J., Amsterdam : Het Spinhuis - p. 103 - 114.
Bedrijfsopleidingen : wie neemt er aan deel en wat levert het op
Groot, W. ; Maassen, H. van den - \ 1999
In: Jaarboek 1998/1999 / Bovenberg, A.L., - p. 103 - 115.
Overscholing op de arbeidsmarkt : een meta-analyse
Groot, W. ; Maassen, H. van den - \ 1999
Maandschrift Economie 63 (1999)april. - ISSN 0013-0486 - p. 144 - 160.
The price of stress
Groot, W. ; Maassen, H. van den - \ 1999
Journal of Economic Psychology 20 (1999)1. - ISSN 0167-4870 - p. 83 - 103.
In this paper an economic approach is taken to the analysis of work-related stress. This economic approach not only allows us to infer the monetary equivalent of stress, it also enables us to test some of the psychological theories on stress, such as the demand/control theory. Evidence is found that the allocation of male workers is based on comparative advantages, while the allocation of female workers is based on absolute advantages. For males, but not for females, it is found that if work with stress pays more relative to work without stress, workers are more likely to accept a job with stress. It is further found that job demands affect work-related stress more than aspects of job control.
Orally administered Lactobacillus strains differentially affect the direction and efficacy of the immune response
Maassen, C.B.M. ; Holten, J.C.A.M. van; Balk, F. ; Heijne den Bak-Glashouwer, M.J. ; Leer, R. ; Laman, J.D. ; Boersma, W.J.A. ; Claassen, E. - \ 1998
Veterinary Quarterly 20 (1998)SUPPL. 3. - ISSN 0165-2176 - p. S81 - S83.
In mice, strain dependent cytokine production profiles are induced after oral administration of Lactobacillus. Such a cytokine profile seems to determine the direction and efficacy of the humoral response. In SJL mice lactobacilli are able to enhance or inhibit the development of disease after induction of experimental autoimmune encephalomyelitis (EAE). Immuno- histochemical analysis of cytokine profiles showed that differential modulation is obtained dependent on the Lactobacillus strain applied. Serum antibody responses to i.p. immunisation with chicken gama globulin in BALB/c mice are also modulated by oral application of Lactobacillus. Lactobacilli are now being developed as safe live antigen carriers for application in vaccine technology, but also for the excretion of autoantigens in order to induce tolerance. The findings of this study imply that by proper strain selection the direction of the response can be influenced by the induction of a specific cytokine profile.
Calculating the value of life by an income evaluation approach
Groot, W. ; Maassen, H. van den; Plug, E.J.S. - \ 1998
Unknown Publisher - 23 p.
The Costs of Mental and Physical Distress
Groot, W. ; Maassen, H. van den; Plug, E. - \ 1998
Unknown Publisher - 23 p.
Alles is economie.
Maassen van den Brink, H. - \ 1998
Wageningen : LUW - 35
huishoudens - productiviteit - efficiëntie - vrouwelijke arbeidskrachten - vrouwelijke werknemers - vrouwen - werk - werkgelegenheid - arbeid (werk) - arbeidsverdeling - huishoudelijk werk - arbeidsmarkt - colleges (hoorcolleges) - households - productivity - efficiency - female labour - women workers - women - work - employment - labour - division of labour - housework - labour market - lectures
Over education in the labor market: a meta-analysis.
Maassen van den Brink, H. ; Groot, W. - \ 1998
Unknown Publisher
Education, training and employability.
Maassen van den Brink, H. ; Groot, W. - \ 1998
Unknown Publisher
Overeducation in the labor market: a meta-analysis.
Groot, W. ; Maassen van den Brink, H. - \ 1998
In: 12th ESPE Conference, Amsterdam, The Netherlands - p. 36 - 36.
Wat is het leven ons waard.
Groot, W. ; Maassen van den Brink, H. ; Plug, E. - \ 1998
ESB Economisch Statistische Berichten 83 (1998). - ISSN 0013-0583 - p. 497 - 499.
Een scholingsinstrument voor oudere werknemers in de metaalnijverheid.
Groot, W. ; Maassen van den Brink, H. ; Onstenk, J. ; Heskes, S. - \ 1998
Unknown Publisher
Returns to child care: trends in child care use, and female labor supply.
Maassen van den Brink, H. ; Groot, W. - \ 1998
In: Child care and female labour supply in the Netherlands: facts, analyses, policies / Schippers, J., Siegers, J., de Jong-Gierveld, J., - p. 81 - 104.
Overscholing en verdringing op de arbeidsmarkt.
Groot, W. ; Maassen van den Brink, H. ; Oosterbeek, H. ; Webbink, D. ; Hartog, J. - \ 1998
Amsterdam : Welboom (Serie wetenschappelijke publikaties 20) - ISBN 9789071667541 - 93 p.
De Nederlandse Emancipatie Index: een monitorinstrument van arbeid, zorg en inkomen.
Maassen van den Brink, H. ; Groot, W. - \ 1998
In: Naar een nieuw sociaal contract in de 21e eeuw / Wierda, E., - p. 65 - 70.
Begrotingspolitiek verdrijft vrouwen van de arbeidsmarkt.
Maassen van den Brink, H. - \ 1998
In: De prijs van de Euro / Reuten, G., Vendrik, K., Went, R., - p. 110 - 118.
De sociaal-economische positie van vrouwen en mannen in Nederland.
Maassen van den Brink, H. - \ 1998
Huishoudstudies 8 (1998). - p. 29 - 38.
De positie van ouderen op de arbeidsmarkt.
Maassen van den Brink, H. ; Groot, W. - \ 1998
Opleiding en Ontwikkeling 11 (1998). - ISSN 0922-0895 - p. 21 - 27.
Bedrijfsopleidingen: wie neemt er aan deel en wat levert het op?
Groot, W. ; Maassen van den Brink, H. - \ 1998
Maandschrift Economie 62 (1998). - ISSN 0013-0486 - p. 28 - 40.
A household production model of paid labour, household work and child care.
Maassen van den Brink, H. ; Groot, W. - \ 1997
In: Spec. Issue on the Economics of Household Behaviour, Kooreman, P. en J. Rouwendal (red). De Economist 145(3) - p. 325 - 343.
Bedrijfsscholing vergroot achterstand werklozen.
Maassen van den Brink, H. ; Groot, W. - \ 1997
De Volkskrant (1997).
Minder kinderopvang voor lager opgeleide vrouwen.
Maassen van den Brink, H. ; Groot, W. - \ 1997
Trouw (1997)16-05-1997.
Poldermodel heeft zijn glans aan werkende vrouw te danken.
Maassen van den Brink, H. ; Groot, W. - \ 1997
De Volkskrant (1997).
Scholing mag geen doel op zich worden.
Maassen van den Brink, H. ; Groot, W. - \ 1997
De Volkskrant (1997).
Parental time-allocation and day care.
Maassen van den Brink, H. ; Groot, W. - \ 1997
In: Time allocation and Gender / Tijdens, K., van Doorne-Huiskens, A., Willemsen, T., - p. 79 - 99.
Scholing, arbeidsmarkt en economische ontwikkeling. (Schooling, labor market and economic development).
Maassen van den Brink, H. ; Groot, W. - \ 1997
Rostra Economica 42 (1997). - p. 20 - 22.
Check title to add to marked list
<< previous | next >>

Show 20 50 100 records per page

 
Please log in to use this service. Login as Wageningen University & Research user or guest user in upper right hand corner of this page.