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 - 20 / 210

  • help
  • print

    Print search results

  • export

    Export search results

  • alert
    We will mail you new results for this query: q=Hal
Check title to add to marked list
First evidence of a new spawning stock of Illex coindetii in the North Sea (NE-Atlantic)
Oesterwind, Daniel ; Bobowski, Bianca T.C. ; Brunsch, Anika ; Laptikhovsky, Vladimir ; Hal, Ralf Van; Sell, Anne F. ; Pierce, Graham J. - \ 2020
Fisheries Research 221 (2020). - ISSN 0165-7836
North Sea - ommastrephidae - illex - reproduction - distribution - Life cycle
Global changes drive abundance and distribution of species worldwide. It seems that at least some cephalopodstocks profit from global changes as indicated by increases in biomass and/or expansion of their geographicaldistribution, as appears to be the case for the commercially important ommastrephid squidIllexcoindetii, in theNorth Sea. Based on the recently increased abundance of this species seen in research trawl hauls, here wepresent the first evidence of a summer spawning stock ofIllexcoindetiiin the North Sea and derive a descriptionof its life cycle. Neither mated females nor spent males were reported from the area previously. In quarter 1 themajority ofIllexcoindetiiwere immature (maturity stage 0) and maturing (maturity stage 1–3) while in quarter 3almost exclusively mature and spent individuals (maturity stage 4–6) were caught. We observed up to threespermatangia bundles attached to females in quarter 3, indicating that spawning and reproduction takes place inthe North Sea and that the species is already established in this area. Estimated egg hatching dates suggest aprolonged hatching period and therefore likely a long spawning season, although cold temperature seems tolimit year round reproduction. The intensity of individual migrations from adjacent waters into the North Sea isunknown and therefore the number of individuals staying permanently in the North Sea could not be estimated.It is consequently still unclear whether the North Sea individuals ofI. coindetiiconstitute a new separate stock
Hepcidin-guided screen-and-treat interventions against iron-deficiency anaemia in pregnancy: a randomised controlled trial in The Gambia
Bah, Amat ; Muhammad, Abdul Khalie ; Wegmuller, Rita ; Verhoef, Hans ; Goheen, Morgan M. ; Sanyang, Saikou ; Danso, Ebrima ; Sise, Ebrima A. ; Pasricha, Sant Rayn ; Armitage, Andrew E. ; Drakesmith, Hal ; Cross, James H. ; Moore, Sophie E. ; Cerami, Carla ; Prentice, Andrew M. - \ 2019
The Lancet Global Health 7 (2019)11. - ISSN 2214-109X - p. e1564 - e1574.

Background: WHO recommends daily iron supplementation for pregnant women, but adherence is poor because of side-effects, effectiveness is low, and there are concerns about possible harm. The iron-regulatory hormone hepcidin can signal when an individual is ready-and-safe to receive iron. We tested whether a hepcidin-guided screen-and-treat approach to combat iron-deficiency anaemia could achieve equivalent efficacy to universal administration, but with lower exposure to iron. Methods: We did a three-arm, randomised, double-blind, non-inferiority trial in 19 rural communities in the Jarra West and Kiang East districts of The Gambia. Eligible participants were pregnant women aged 18–45 years at between 14 weeks and 22 weeks of gestation. We randomly allocated women to either WHO's recommended regimen (ie, a daily UN University, UNICEF, and WHO international multiple-micronutrient preparation [UNIMMAP] containing 60 mg iron), a 60 mg screen-and-treat approach (ie, daily UNIMMAP containing 60 mg iron for 7 days if weekly hepcidin was <2·5 μg/L or UNIMMAP without iron if hepcidin was ≥2·5 μg/L), or a 30 mg screen-and-treat approach (ie, daily UNIMMAP containing 30 mg iron for 7 days if weekly hepcidin was <2·5 μg/L or UNIMMAP without iron if hepcidin was ≥2·5 μg/L). We used a block design stratified by amount of haemoglobin at enrolment (above and below the median amount of haemoglobin on every enrolment day) and stage of gestation (14–18 weeks vs 19–22 weeks). Participants and investigators were unaware of the random allocation. The primary outcome was the amount of haemoglobin at day 84 and was measured as the difference in haemoglobin in each screen-and-treat group compared with WHO's recommended regimen; the non-inferiority margin was set at −5·0 g/L. The primary outcome was assessed in the per-protocol population, which comprised all women who completed the study. This trial is registered with the ISRCTN registry, number ISRCTN21955180. Findings: Between June 16, 2014, and March 3, 2016, 498 participants were randomised, of whom 167 were allocated to WHO's recommended regimen, 166 were allocated to the 60 mg per day screen-and-treat approach, and 165 were allocated to the 30 mg per day screen-and-treat approach. 78 participants were withdrawn or lost to follow-up during the study; thus, the per-protocol population comprised 140 women assigned to WHO's recommended regimen, 133 allocated to the 60 mg screen-and-treat approach, and 147 allocated to the 30 mg screen-and-treat approach. The screen-and-treat approaches did not exceed the non-inferiority margin. Compared with WHO's recommended regimen, the difference in the amount of haemoglobin at day 84 was −2·2 g/L (95% CI −4·6 to 0·1) with the 60 mg screen-and-treat approach and −2·7 g/L (–5·0 to −0·5) with the 30 mg screen-and-treat approach. Adherence, reported side-effects, and adverse events were similar between the three groups. The most frequent side-effect was stomachache, which was similar in the 60 mg screen-and-treat group (82 cases per 1906 person-weeks) and with WHO's recommended regimen (81 cases per 1974 person-weeks; effect 1·0, 95% CI 0·7 to 1·6); in the 30 mg screen-and-treat group the frequency of stomachache was slightly lower than with WHO's recommended regimen (58 cases per 2009 person-weeks; effect 0·7, 95% CI 0·5 to 1·1). No participants died during the study. Interpretation: The hepcidin-guided screen-and-treat approaches had no advantages over WHO's recommended regimen in terms of adherence, side-effects, or safety outcomes. Our results suggest that the current WHO policy for iron administration to pregnant women should remain unchanged while more effective approaches continue to be sought. Funding: Bill & Melinda Gates Foundation and the UK Medical Research Council.

Ecologisch gericht suppleren: meetplan strandsurvey 2019
Geest, Matthijs van der; Tulp, Ingrid ; Hal, Ralf van - \ 2019
Den Helder : Wageningen Marine Research (Wageningen Marine Research rapport C045/19) - 25
Suppleties van zand op vooroever of strand worden in opdracht van Rijkswaterstaat uitgevoerd om de Nederlandse kust tegen erosie te beschermen en om voldoende zand in het kustfundament te houden. Een groot deel van de suppleties vindt plaats in of nabij de kuststrook die binnen de Natura2000 kaders wordt beschermd, de Noordzeekustzone. Het is dus van belang de eventuele effecten van deze praktijk op de natuur zorgvuldig te bestuderen, zodat dit effect kan worden afgezet tegen het algemene nut voor de maatschappij. Betere kennis van de effecten kan leiden tot beperking van eventuele schade aan en mogelijk zelfs tot versterking van gewenste natuurwaarden en ecosysteemdiensten. Tot nog toe is er vooral aandacht geweest voor de gevolgen van suppleren op benthos en weinig voor de mogelijke effecten op vispopulaties, terwijl de ondiepe kustzone als kinderkamer voor vis een zeer belangrijke economische ecosysteemdienst levert. Kennis van de habitatfactoren die het voorkomen van juveniele vis in kinderkamers bepalen leidt tot een verbeterd inzicht van de gevolgen van suppleties op vispopulaties en van de voedselketen van viseters in de ondiepe kustzone. De kennisinstituten Deltares en Wageningen Marine Research hebben te samen in overleg met natuurorganisaties in 2016 het document `Ecologische effecten van zandsuppleties’ (Herman et al. 2016) geschreven met als doel onderzoek te formuleren naar ecologische effecten van zandsuppleties. In het onderdeel ‘uitvoeringsplan’ (deel C in Herman et al. 2016) zijn 3 onderzoekslijnen (ook wel Krachtlijnen genoemd) gedefinieerd, te weten: Vooroever, Duinen en Waddenzee. Het hier beschreven meetplan voor een strandsurvey in 2019 valt onder de onderzoekslijn Vooroever. De onderzoeksvraag luidt: “Wat zijn de cumulatieve gevolgen van reguliere suppleties op samenstelling en functioneren van het ecosysteem van de ondiepe vooroever van de Nederlandse kust?”. Deze volgt uit de prioritering van de krachtlijn Vooroever: (cumulatieve) gevolgen van reguliere suppleties op samenstelling en functioneren van het ecosysteem van de vooroever. Conform het plan van aanpak voor dit programma (Herman et al. 2016) wordt voorgesteld om een strandsurvey uit te voeren in de brandingszone (<1 m diepte), waarbij vis, benthos en habitatkarakteristieken worden bemonsterd. Deze strandsurvey is daarmee een onderdeel van een groter pakket van geplande dataverzameling in het kader van Ecologisch Gericht Suppleren II/Natuurlijk Veilig. Het hoofddoel van de strandsurvey is om gedurende het voorjaar (maart-juni) iedere 2 à 3 weken op drie verschillende locaties data te verzamelen over aantallen, conditie, groei en dieet van juveniele platvis in de brandingszone in relatie tot relevante omgevingsvariabelen, zowel abiotisch als biotisch. De survey zal inzicht verschaffen wanneer en in welke mate de brandingszone in die periode gebruikt wordt als kinderkamer voor jonge platvis en in hoeverre dit gebruik en conditie, groei, en dieet afhangen van biotische en abiotische omgevingsvariabelen en of dit verschilt per platvissoort. Dit rapport beschrijft de meetstrategie, de meetmethoden, de te meten variabelen (vis, benthos en omgevingsvariabelen) en de bemonsteringslocaties voor de strandsurvey 2019.
260 wetenschappers maakten mogelijk reclame voor zichzelf in andermans publicaties
Groenigen, J.W. van - \ 2019
Accounting for feed-food competition in environmental impact assessment: Towards a resource efficient food-system
Hal, O. van; Weijenberg, A.A.A. ; Boer, I.J.M. de; Zanten, H.H.E. van - \ 2019
Journal of Cleaner Production 240 (2019). - ISSN 0959-6526
Circular food system - Egg production - Feed-food competition - Life cycle assessment - Livestock production - Sustainable food production

This study demonstrates the effect of better accounting for feed-food competition in life cycle assessment (LCA) to derive mitigation strategies that contribute to efficiently feeding the growing world population. Economic allocation, commonly used in LCA, falls short in accounting for feed-food competition as it does not consider interlinkages in the food system. The authors hypothesise that an alternative “food-based” allocation better accounts for food-feed competition by assigning no environmental impact to feed products unfit for human consumption. To evaluate the impact of accounting for feed-food competition on LCA results, economic and food-based allocation were compared in an LCA of a novel egg production system that feeds only products unsuitable or undesired for human consumption. Using economic allocation, the global warming potential (GWP) of 1.30 kg CO2-eq, energy use (EU) of 10.49 MJ, land use (LU) of 2.90 m2, and land use ratio (LUR) of 1.56 per kg egg of the case study farm were all lower than that of free range or organic eggs. Avoiding feed-food competition on this farm reduced the environmental impact per kg egg by 56–65% for GWP, 46–54% for EU, 35–48% for LU and 88% for LUR, compared to free-range laying hens fed a conventional diet. Accounting for feed-food competition with food-based allocation further reduced impacts per kg egg by 44% for GWP to 0.57 kg CO2-eq, 38% for EU to 4.05 MJ, 90% for LU to 2.59 m2, and 83% for LUR to 1.29. This improved LCA better captures the complexity of the food system.

Upcycling food leftovers and grass recources through farm animals
Hal, O. van; Boer, I.J.M. de; Muller, A. ; Vries, S. de; Erb, K. ; Schader, Christian ; Zanten, H.H.E. van - \ 2019
In: Book of Abstracts of the 70th Annual Meeting of the European Federation of Animal Science. - Wageningen Academic Publishers (EAAP book of abstracts ) - ISBN 9789086863396 - p. 316 - 316.
De Amazone brandt - maar hoe fel?
Zuidema, Pieter ; Stoof, Cathelijne ; Bongers, Frans - \ 2019
De ecologie van het Amelander Zeegat : Een inventarisatie naar kennis over het ecologische functioneren van het Amelander Zeegat
Bogaart, Lisanne van den; Hal, Ralf van; Meijden, Mirte van der; Brasseur, Sophie ; Baptist, Martin ; Wijsman, Jeroen - \ 2019
IJmuiden : Wageningen Marine Research (Wageningen Marine Research rapport C032/19) - 60
Intraspecific variability in response to phosphorus depleted conditions in the cyanobacteria Microcystis aeruginosa and Raphidiopsis raciborskii
Guedes, Iame Alves ; Pacheco, Ana Beatriz F. ; Vilar, Mauro C.P. ; Mello, Mariana M. ; Marinho, Marcelo Manzi ; Lurling, Miquel ; Azevedo, Sandra M.F.O. - \ 2019
Harmful Algae 86 (2019). - ISSN 1568-9883 - p. 96 - 105.
Cylindrospermopsis - Ecotypes - Phosphorus uptake - Strain variability

Phosphorus loading plays an important role in the occurrence of cyanobacterial blooms and understanding how this nutrient affects the physiology of cyanobacteria is imperative to manage these phenomena. Microcystis aeruginosa and Raphidiopsis raciborskii are cyanobacterial species that form potentially toxic blooms in freshwater ecosystems worldwide. Blooms comprise numerous strains with high trait variability, which can contribute to the widespread distribution of these species. Here, we explored the intraspecific variability in response to phosphorus depleted conditions (P-)testing five strains of each species. Strains could be differentiated by cell volume or genetic profiles except for those of the same species, sampling location and date, though these presented differences in their response to (P-). Although differently affected by (P-)over 10 days, all strains were able to grow and maintain photosynthetic activity. For most M. aeruginosa and R. raciborskii strains growth rates were not significantly different comparing (P+)and (P-)conditions. After ten days in (P-), only one M. aeruginosa strain and two R. raciborskii strains showed reduction in biovolume yield as compared to (P+)but in most strains chlorophyll-a concentrations were lower in (P-)than in (P+). Reduced photosystem II efficiency was found for only one R. raciborskii strain while all M. aeruginosa strains were affected. Only two M. aeruginosa and one R. raciborskii strain increased alkaline phosphatase activity under (P-)as compared to (P+). Variation in P-uptake was also observed but comparison among strains yielded homogeneous groups comprised of representatives of both species. Comparing the response of each species as a whole, the (P-)condition affected growth rate, biovolume yield and chlorophyll yield. However, these parameters revealed variation among strains of the same species to the extent that differences between M. aeruginosa and R. raciborskii were not significant. Taken together, these results do not support the idea that R. raciborskii, as a species, can withstand phosphorus limitation better than M. aeruginosa and also point that the level of intraspecific variation may preclude generalizations based on studies that use only one or few strains.

Knowledge, attitudes and practices of cervical cancer prevention among Zambian women and men
Nyambe, Anayawa ; Kampen, Jarl K. ; Baboo, Stridutt K. ; Hal, Guido Van - \ 2019
BMC Public Health 19 (2019)1. - ISSN 1471-2458
Attitude - Cervical cancer - Knowledge - Practices - Screening - Social ecological model - Theory of triadic influence - Vaccination - Zambia

Background: In Zambia, cervical cancer screening was started in 2006 and the human papillomavirus vaccine was piloted in 2013. Nevertheless, cervical cancer remains the leading cancer. It is assumed that knowledge, social interaction, health behaviors and religion are factors that can influence screening and vaccination practices. This study addresses the question, what is the relationship between knowledge about cervical cancer, attitudes, self-reported behavior, and immediate support system, towards screening and vaccination of cervical cancer of Zambian women and men. The results of this study serve as a basis for future research, an input for improvement and adjustment of the existing prevention program and build on documented health behavior frameworks. Methods: A cross-sectional mixed methods study was conducted from February to May 2016. Two separate questionnaires were used to collect data from women (N = 300) and men (N = 300) residing in Chilenje and Kanyama (two townships in the capital city Lusaka). Respondent's knowledge of cervical cancer was operationalized by grading their ability to correctly identify causes and protective factors if they were aware of cervical cancer. Besides providing descriptive statistics of all study variables, we tested four research hypotheses concerning the link between knowledge, attitudes and practices suggested by the literature, by applying appropriate statistical tests (chi square test, analysis of variance, logistic regression). Results: Less than half of the respondents (36.8%) had heard of cervical cancer, 20.7% of women had attended screening and 6.7% of the total sample had vaccinated their daughter. Knowledge of causes and prevention was very low. There was a strong association between having awareness of cervical cancer and practicing screening (odds ratio = 20.5, 95% confidence interval = [9.214, 45.516]) and vaccination (odds ratio = 5.1, 95% confidence interval = [2.473, 10.423]). Social interactions were also found to greatly influence screening and vaccination behaviors. Conclusions: The low level of knowledge of causes and prevention of cervical cancer suggests a need to increase knowledge and awareness among both women and men. Interpersonal interactions have great impact on practicing prevention behaviors, for instance, vaccination of daughters.

Report on T5.4: Sustainability impacts of potential innovations in the supply chain of livestock and fish, and fruit and vegetables, and sustainable future diets : Deliverable No. D5.4
Zanten, H.H.E. van; Hal, O. van; Ziegler, F. ; Hornborg, Sara ; Latka, Catharina ; Parodi Parodi, Alejandro ; Achterbosch, T.J. ; Bianchi, Marta ; Boer, I.J.M. de; Borthwick, Louisa ; Burgstaller, Elke ; Heckelei, Thomas ; Leip, Adrian ; Valin, H. - \ 2019
SUSFANS - 84 p.
Reisverslag IBTS-Q1 2019
Hal, R. van - \ 2019
Wageningen Marine Research (Rapport / Wageningen Marine Research 19.006) - 28 p.
Avoiding feed-food competition in practice; Environmental impact assessment of a novel egg production system
Hal, O. van; Weijenberg, Adinda ; Boer, I.J.M. de; Zanten, H.H.E. van - \ 2019
In: Trade-Offs in Science - Keeping the balance. - Wageningen University & Research - p. 42 - 43.
Feed cultivation on arable land (40% globally) results in less efficient food production than food crop cultivation. This inefficiency can be avoided using livestock feeds that do not compete with food production, so called “low-opportunity-cost feedstuffs” (e.g. food by-products & waste and grazing resources). livestock, then, converts nutrients otherwise lost to the food system into valuable food. While this new role of livestock is theoretically well supported, its practical feasibility remains unstudied. We, therefore, assessed the environmental benefits of feeding only “low-opportunity-cost feed-stuffs” to industrially-housed laying hens on the commercial Kipster farm. Simultaneously we underline the shortcomings of conventional methods to account for such benefits. We quantified global warming potential, energy use and land use per kg egg, using life cycle assessment (LCA), Kipster eggs have a lower environmental impact (1.3 kg CO2-eq; 10 MJ; 2.9 m2), than free range and organic eggs (2.5-3.5 kg CO2-eq; 19-27 MJ; 4.1-6.8 m2), mainly due to the use of “low-opportunity-cost feedstuffs”. Additionally, we illustrate that economic allocation used in LCA does not fully account for the environmental benefits of feeding “low-opportunity-cost feedstuffs”, as it ignores interlinkages in the food system between, for example, sugar and beet pulp. Alternative circular allocation – allocating the full impact to the main product – reduces Kipsters environmental impact with 44% for GWP, 37% for EU and 90% for LU. Adequately capturing such complexities of the food system in LCA is of major importance to avoid promotion of mitigation measures that counteract resource use efficiency of the entire food system.
Combining tree species and decay stages to increase invertebrate diversity in dead wood
Andringa, Joke I. ; Zuo, Juan ; Berg, Matty P. ; Klein, Roy ; van't Veer, Jip ; Geus, Rick de; Beaumont, Marco de; Goudzwaard, Leo ; Hal, Jurgen van; Broekman, Rob ; Logtestijn, Richard S.P. van; Li, Yikang ; Fujii, Saori ; Lammers, Mark ; Hefting, Mariet M. ; Sass-Klaassen, Ute ; Cornelissen, Johannes H.C. - \ 2019
Forest Ecology and Management 441 (2019). - ISSN 0378-1127 - p. 80 - 88.
Biodiversity - Chilipoda - Coarse woody debris - Coleoptera - Diplopoda - Habitat heterogeneity - Invertebrates - Isopoda - Managed forest - Wood decomposition

Dead wood availability and the variability in dead wood quality, i.e. tree species and decay stages, are often low in managed forests, which negatively affects biodiversity of invertebrate species. Leaving more (coarse) dead wood can increase invertebrate richness, but it remains unclear how many and which combinations of tree taxa and decay stages are required to optimize niche heterogeneity in managed forests. We investigated the diversity of the main arthropod groups associated with dead wood, i.e. millipedes, centipedes, isopods and beetles, through the first four years of decomposition of logs of twenty common temperate tree species placed in the “common garden” experiment LOGLIFE. We hypothesized that (1) invertebrate richness for combinations of a given number of tree species would be promoted by mixing both tree species and decay period and that (2) invertebrate richness increases up to a saturation point with more tree species at different decay stages added. We also hypothesized that (3) an increase in phylogenetic distance among the tree species in combinations would promote their overall invertebrate diversity. We found that the better combinations, in terms of invertebrate richness, after one and two years of decay, but not after four years, consisted of a mix of gymnosperms and angiosperms, indicating that variation in tree species is especially important during the initial decomposition period. The best combinations in terms of invertebrate richness consisted of at least one tree species from each decay period, indicating that also variation in the decay stage of the tree is important to promote invertebrate diversity. We observed that at least four wood types were required to approach the 95% saturation point for species richness. The third hypothesis, that dissimilarity in phylogenetic position could be a predictive tool for increasing invertebrate richness in combinations of tree species, was not supported by our results. Thus, in order to maintain diversity of dead wood invertebrates in forests we recommend not only to provide richness in tree species, but also to plant particular combinations of trees (preferably angiosperm-gymnosperm combinations) that differ in the invertebrate communities they typically host and to temporally spread the logging of trees. This way the logging residues cover different resources and habitats at each moment in time, which is likely to result in a large diversity of dead wood invertebrates.

Upcycling food leftovers and grass resources through livestock: Impact of livestock system and productivity
Hal, O. van; Boer, I.J.M. de; Muller, A. ; Vries, S. de; Erb, K.H. ; Schader, C. ; Gerrits, W.J.J. ; Zanten, H.H.E. van - \ 2019
Journal of Cleaner Production 219 (2019). - ISSN 0959-6526 - p. 485 - 496.
Circular food system - Feed-food competition - Food waste - Livestock production - Nutrition security - Resource use efficiency

Consumption of animal-source food is criticised, among other reasons, for its relatively high environmental impact. It is, however, increasingly acknowledged that livestock can contribute to nutrition security if they upcycle low-opportunity-cost feed (LCF) – food waste, food processing by-products and grass resources – into nutritious animal-source food. So far, however, no study explored the allocation question “to which livestock should we feed what LCF to maximise livestock's contribution to human nutrition”. Here we optimise the use of the LCF available in the EU, using a model that assigns LCF to those livestock systems that maximise animal protein production. We included the five most common livestock systems in the EU – pigs, laying hens, broilers, dairy cattle and beef cattle – considering their nutrient requirements under three productivity levels (low, mid and high). LCF availability is based on current food supply combined with food wastage and food processing data, and current grassland productivity. Our results showed that optimal conversion of LCF available in the EU, could supply 31 g animal protein per EU capita per day. We confirmed that this optimal conversion requires a variety of both livestock systems and productivity levels. Dominant livestock systems were those that have a high conversion efficiency (laying hens, dairy cattle), were best able to valorise specific LCF (dairy cattle for grass; pigs for food waste), and could valorise low quality LCF because of their low productivity. Limiting the model to use only conventional, high productive, livestock reduced animal protein supply by 16% to 26 g/(cap*d). Besides the efficiency with which livestock used the available LCF, the estimated protein supply from livestock fed solely on LCF, was sensitive to assumptions regarding the availability and quality of LCF, especially grass resources. Our model provides valuable insights into how livestock can efficiently use LCF, which is essential for a transition towards a circular food system.

En toen was er leven op de maan: China laat katoenplantje ontkiemen
Wamelink, Wieger - \ 2019
Using Film to Disseminate Information on Cervical Cancer Prevention in Lusaka: Results from a Small Intervention Study
Nyambe, Anayawa ; Kampen, Jarl K. ; Baboo, Stridutt K. ; Hal, Guido Van - \ 2019
Journal of Cancer Education 34 (2019)5. - ISSN 0885-8195 - p. 854 - 859.
Cervical cancer - Film - Intervention - Knowledge - Zambia

In order to prevent the spread of cervical cancer, people must be aware and knowledgeable about the available preventive practices such as screening and vaccination. The purpose of this study was to determine the extent that film is effective in disseminating information on cervical cancer and its prevention to women and men in Lusaka. A pilot intervention study was carried out at churches in Lusaka city from August to September 2017. A sample size of 38 women and 43 men filled in both baseline and follow-up questionnaires. A knowledge grade (range, 1–10 points) which linked causes to risk factors for cervical cancer was used to assess the knowledge of a respondent. Significant results (p < 0.01) were obtained at follow-up for watching the film and having awareness and knowledge. The main finding is that a short informational film can be an effective means of disseminating information on cervical cancer and its prevention to women and men.

Meetplan 2019 Amelander Zeegat : T1 Ecologie buitendelta
Hal, Ralf van; Wijsman, Jeroen ; Bogaart, Lisanne van den; Baptist, Martin - \ 2018
IJmuiden : Wageningen Marine Research (Wageningen Marine Research rapport C108/18) - 39
Reisverslag kustsurvey EGSII : Juni 2018
Hal, Ralf van; Dijkman Dulkes, André - \ 2018
IJmuiden : Wageningen Marine Research (Wageningen Marine Research rapport C076.18) - 21
In de periode 18 tot 22 juni 2018 heeft Wageningen Marine Research in opdracht van Rijkswaterstaat een multidisciplinaire survey uitgevoerd in de vooroever bij Schiermonnikoog. De survey was opgezet om de verspreiding en abundantie van vis in de vooroever te bepalen en gegevens te verzamelen van (a)biotische factoren die deze verspreiding bepalen. Het doel is deze gegevens te gebruiken om mogelijke effecten van zandsuppleties in de vooroever op vis te voorspellen. De dit jaar uitgevoerde bemonsteringen zijn een aanvulling op de werkzaamheden uitgevoerd in 2017. In de vooroever van Schiermonnikoog waren zes raaien met zeven monsterlocaties van strand tot 10 meter diepte gepland. De geplande bemonsteringsactiviteiten op deze locaties waren voor vis: boomkor, zegen en akoestisch; voor benthos en sediment: steekbuizen, boxcore en 3d-stereocamera; voor zoöplankton: WP2-net; en voor omgevingsvariabelen: CTD, Secchi-schijf en multimeter. In de betreffende week is de uitvoering door met name de weersomstandigheden beperkt gebleven tot de diepste 4 stations op 5 van de 6 raaien. Er zijn twee ondiepe stations bemonsterd met de boomkor, maar dit was vanwege de weersomstandigheden geen succes. Dit alles is gedaan van maandag tot woensdag, de weersomstandigheden maakte bemonsteren op donderdag en vrijdag onmogelijk. Woensdag is er geprobeerd ook raai 6 te bemonsteren, maar tijdens een boomkortrek op deze raai kwam het tuig vast te zitten en kwam dit uiteindelijk zwaar beschadigd boven. Door de tijd die dit kostte is het niet gelukt de verdere bemonstering op raai 6 uit te voeren. Aanvullend is op 27 juni vanaf het strand van Schiermonnikoog een groot deel van de ondiepe stations bemonsterd. Daarmee is het grootste deel van het programma toch bemonsterd.
Zandspiering in het Amelander Zeegat : T0-meting voorjaar 2018
Hal, Ralf van - \ 2018
IJmuiden : Wageningen Marine Research (Wageningen Marine Research rapport C091/18) - 31
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.