Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

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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.
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