Staff Publications

Staff Publications

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

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

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

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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Patterns of nitrogen-fixing tree abundance in forests across Asia and America
Menge, Duncan N.L. ; Chisholm, Ryan A. ; Davies, Stuart J. ; Abu Salim, Kamariah ; Allen, David ; Alvarez, Mauricio ; Bourg, Norm ; Brockelman, Warren Y. ; Bunyavejchewin, Sarayudh ; Butt, Nathalie ; Cao, Min ; Chanthorn, Wirong ; Chao, Wei Chun ; Clay, Keith ; Condit, Richard ; Cordell, Susan ; Silva, João Batista da; Dattaraja, H.S. ; Andrade, Ana Cristina Segalin de; Oliveira, Alexandre A. de; Ouden, Jan den; Drescher, Michael ; Fletcher, Christine ; Giardina, Christian P. ; Savitri Gunatilleke, C.V. ; Gunatilleke, I.A.U.N. ; Hau, Billy C.H. ; He, Fangliang ; Howe, Robert ; Hsieh, Chang Fu ; Hubbell, Stephen P. ; Inman-Narahari, Faith M. ; Jansen, Patrick A. ; Johnson, Daniel J. ; Kong, Lee Sing ; Král, Kamil ; Ku, Chen Chia ; Lai, Jiangshan ; Larson, Andrew J. ; Li, Xiankun ; Li, Yide ; Lin, Luxiang ; Lin, Yi Ching ; Liu, Shirong ; Lum, Shawn K.Y. ; Lutz, James A. ; Ma, Keping ; Malhi, Yadvinder ; McMahon, Sean ; McShea, William ; Mi, Xiangcheng ; Morecroft, Michael ; Myers, Jonathan A. ; Nathalang, Anuttara ; Novotny, Vojtech ; Ong, Perry ; Orwig, David A. ; Ostertag, Rebecca ; Parker, Geoffrey ; Phillips, Richard P. ; Abd. Rahman, Kassim ; Sack, Lawren ; Sang, Weiguo ; Shen, Guochun ; Shringi, Ankur ; Shue, Jessica ; Su, Sheng Hsin ; Sukumar, Raman ; Fang Sun, I. ; Suresh, H.S. ; Tan, Sylvester ; Thomas, Sean C. ; Toko, Pagi S. ; Valencia, Renato ; Vallejo, Martha I. ; Vicentini, Alberto ; Vrška, Tomáš ; Wang, Bin ; Wang, Xihua ; Weiblen, George D. ; Wolf, Amy ; Xu, Han ; Yap, Sandra ; Zhu, Li ; Fung, Tak - \ 2019
Journal of Ecology 107 (2019)6. - ISSN 0022-0477 - p. 2598 - 2610.
forest - legume - nitrogen fixation - nutrient limitation - Smithsonian ForestGEO - symbiosis

Symbiotic nitrogen (N)-fixing trees can provide large quantities of new N to ecosystems, but only if they are sufficiently abundant. The overall abundance and latitudinal abundance distributions of N-fixing trees are well characterised in the Americas, but less well outside the Americas. Here, we characterised the abundance of N-fixing trees in a network of forest plots spanning five continents, ~5,000 tree species and ~4 million trees. The majority of the plots (86%) were in America or Asia. In addition, we examined whether the observed pattern of abundance of N-fixing trees was correlated with mean annual temperature and precipitation. Outside the tropics, N-fixing trees were consistently rare in the forest plots we examined. Within the tropics, N-fixing trees were abundant in American but not Asian forest plots (~7% versus ~1% of basal area and stems). This disparity was not explained by mean annual temperature or precipitation. Our finding of low N-fixing tree abundance in the Asian tropics casts some doubt on recent high estimates of N fixation rates in this region, which do not account for disparities in N-fixing tree abundance between the Asian and American tropics. Synthesis. Inputs of nitrogen to forests depend on symbiotic nitrogen fixation, which is constrained by the abundance of N-fixing trees. By analysing a large dataset of ~4 million trees, we found that N-fixing trees were consistently rare in the Asian tropics as well as across higher latitudes in Asia, America and Europe. The rarity of N-fixing trees in the Asian tropics compared with the American tropics might stem from lower intrinsic N limitation in Asian tropical forests, although direct support for any mechanism is lacking. The paucity of N-fixing trees throughout Asian forests suggests that N inputs to the Asian tropics might be lower than previously thought.

A specific synbiotic-containing amino acid-based formula restores gut microbiota in non-IgE mediated cow's milk allergic infants: A randomized controlled trial
Wopereis, Harm ; Ampting, Marleen T.J. Van; Cetinyurek-Yavuz, Aysun ; Slump, Rob ; Candy, David C.A. ; Butt, Assad M. ; Peroni, Diego G. ; Vandenplas, Yvan ; Fox, Adam T. ; Shah, Neil ; Roeselers, Guus ; Harthoorn, Lucien F. ; Michaelis, Louise J. ; Knol, Jan ; West, Christina E. - \ 2019
Clinical and Translational Allergy 9 (2019)1. - ISSN 2045-7022
Cow's milk allergy - Gut microbiota - Pediatrics - Prebiotics - Probiotics

Background: Altered gut microbiota is implicated in cow's milk allergy (CMA) and differs markedly from healthy, breastfed infants. Infants who suffer from severe CMA often rely on cow's milk protein avoidance and, when breastfeeding is not possible, on specialised infant formulas such as amino-acid based formulas (AAF). Herein, we report the effects of an AAF including specific synbiotics on oral and gastrointestinal microbiota of infants with non-IgE mediated CMA with reference to healthy, breastfed infants. Methods: In this prospective, randomized, double-blind controlled study, infants with suspected non-IgE mediated CMA received test or control formula. Test formula was AAF with synbiotics (prebiotic fructo-oligosaccharides and probiotic Bifidobacterium breve M-16V). Control formula was AAF without synbiotics. Healthy, breastfed infants were used as a separate reference group (HBR). Bacterial compositions of faecal and salivary samples were analysed by 16S rRNA-gene sequencing. Faecal analysis was complemented with the analysis of pH, short-chain fatty acids (SCFAs) and lactic acids. Results: The trial included 35 test subjects, 36 controls, and 51 HBR. The 16S rRNA-gene sequencing revealed moderate effects of test formula on oral microbiota. In contrast, the gut microbiota was substantially affected across time comparing test with control. In both groups bacterial diversity increased over time but was characterised by a more gradual increment in test compared to control. Compositionally this reflected an enhancement of Bifidobacterium spp. and Veillonella sp. in the test group. In contrast, the control-fed infants showed increased abundance of adult-like species, mainly within the Lachnospiraceae family, as well as within the Ruminococcus and Alistipes genus. The effects on Bifidobacterium spp. and Lachnospiraceae spp. were previously confirmed through enumeration by fluorescent in situ hybridization and were shown for test to approximate the proportions observed in the HBR. Additionally, microbial activity was affected as evidenced by an increase of l-lactate, a decrease of valerate, and reduced concentrations of branched-chain SCFAs in test versus control. Conclusions: The AAF including specific synbiotics effectively modulates the gut microbiota and its metabolic activity in non-IgE mediated CMA infants bringing it close to a healthy breastfed profile. Trial registration Registered on 1 May 2013 with Netherlands Trial Register Number NTR3979.

A specific synbiotic-containing amino acid-based formula in dietary management of cow's milk allergy : A randomized controlled trial
Fox, Adam T. ; Wopereis, Harm ; Ampting, Marleen T.J. van; Oude Nijhuis, Manon M. ; Butt, Assad M. ; Peroni, Diego G. ; Vandenplas, Yvan ; Candy, David C.A. ; Shah, Neil ; West, Christina E. ; Garssen, Johan ; Harthoorn, Lucien F. ; Knol, Jan ; Michaelis, Louise J. - \ 2019
Clinical and Translational Allergy 9 (2019)1. - ISSN 2045-7022
Bifidobacterium breve M-16V - Cow's milk allergy - Gut microbiota - Prebiotic - Probiotic - Symptoms

Background: Here we report follow-up data from a double-blind, randomized, controlled multicenter trial, which investigated fecal microbiota changes with a new amino acid-based formula (AAF) including synbiotics in infants with non-immunoglobulin E (IgE)-mediated cow's milk allergy (CMA). Methods: Subjects were randomized to receive test product (AAF including fructo-oligosaccharides and Bifidobacterium breve M-16V) or control product (AAF) for 8 weeks, after which infants could continue study product until 26 weeks. Fecal percentages of bifidobacteria and Eubacterium rectale/Clostridium coccoides group (ER/CC) were assessed at 0, 8, 12, and 26 weeks. Additional endpoints included stool markers of gut immune status, clinical symptoms, and safety assessments including adverse events and medication use. Results: The trial included 35 test subjects, 36 controls, and 51 in the healthy reference group. Study product was continued by 86% and 92% of test and control subjects between week 8-12, and by 71% and 80%, respectively until week 26. At week 26 median percentages of bifidobacteria were significantly higher in test than control [47.0% vs. 11.8% (p < 0.001)], whereas percentages of ER/CC were significantly lower [(13.7% vs. 23.6% (p = 0.003)]. Safety parameters were similar between groups. Interestingly use of dermatological medication and reported ear infections were lower in test versus control, p = 0.019 and 0.011, respectively. Baseline clinical symptoms and stool markers were mild (but persistent) and low, respectively. Symptoms reduced towards lowest score in both groups. Conclusion: Beneficial effects of this AAF including specific synbiotics on microbiota composition were observed over 26 weeks, and shown suitable for dietary management of infants with non-IgE-mediated CMA.

ES1406 COST Action: Soil fauna: Key to Soil Organic Matter Dynamics and Fertility. How far have we got?
Jimenez, Juan Jose ; Filser, Juliane ; Barot, S. ; Berg, Matty ; Iglesias Briones, Maria ; Butt, Kevin ; Curiel-Yuste, Jorge ; Deckmyn, Gaby ; Domene, Xavier ; Faber, J.H. ; Frey, B. ; Frossard, Aline ; Frouz, J. ; Grebenc, T. ; Guggenberger, G. ; Hackenberger, Davorka ; Iamandei, Maria ; Jones, D. ; Joschko, Monika ; Krogh, Paul Henning ; team, Keysom - \ 2018
Geophysical Research Abstracts 20 (2018). - ISSN 1029-7006
Soil organic matter (SOM) is key to soil fertility, climate change mitigation, combatting land degradation, and the conservation of above-and below-ground biodiversity and associated ecosystem services like decomposition, nutrient cycling, carbon sequestration, detoxification and maintenance of soil physico-chemical properties. SOM dynamics represent the balance between the input of plant material (residues, root-derived materials) and the output through decomposition (OM mineralization) by organisms, erosion and leaching. Approximately 20% of global CO 2 emissions, one third of global CH4 emissions and two thirds of N2O emissions originate from soils. In many soils, most of the macro-aggregate structure is formed by the activities of soil invertebrates and roots, with important consequences for soil organic matter dynamics, carbon sequestration and water infiltration at several spatial and temporal scales. Current models of SOM dynamics are defined in terms of plant residues input and microbial decomposition, overlooking the important contribution of soil fauna. The composition and activity of soil fauna greatly vary with respect to climate and land use. SOM modelling has thus far largely ignored soil fauna due to various reasons: i) hardly existing communication between [C flow centered] biogeochemistry and [organism-centered] soil ecology, ii) lack of [awareness of] data on soil animals (both in the field and from laboratory experiments) and, iii) two different visions by soil ecologists: foodweb vs. self-organization. An international interdisciplinary approach (COST Action ES1406) is the proper platform for both experimentalists and modellers to discuss and provide solutions. This Action has fostered networking and collaboration for improved SOM models by implementing the role of the soil fauna as a basis for sustainable soil management. Key challenges in SOM management, soil fauna and modelling will be addressed and how far have we got thus far to meet the objectives of this Action.

A synbiotic-containing amino-acid-based formula improves gut microbiota in non-IgE-mediated allergic infants
Candy, David C.A. ; Ampting, Marleen T.J. Van; Oude Nijhuis, Manon M. ; Wopereis, Harm ; Butt, Assad M. ; Peroni, Diego G. ; Vandenplas, Yvan ; Fox, Adam T. ; Shah, Neil ; West, Christina E. ; Garssen, Johan ; Harthoorn, Lucien F. ; Knol, Jan ; Michaelis, Louise J. - \ 2018
Pediatric Research 83 (2018)3. - ISSN 0031-3998 - p. 677 - 686.
BackgroundPrebiotics and probiotics (synbiotics) can modify gut microbiota and have potential in allergy management when combined with amino-acid-based formula (AAF) for infants with cow's milk allergy (CMA).MethodsThis multicenter, double-blind, randomized controlled trial investigated the effects of an AAF-including synbiotic blend on percentages of bifidobacteria and Eubacterium rectale/Clostridium coccoides group (ER/CC) in feces from infants with suspected non-IgE-mediated CMA. Feces from age-matched healthy breastfed infants were used as reference (healthy breastfed reference (HBR)) for primary outcomes. The CMA subjects were randomized and received test or control formula for 8 weeks. Test formula was a hypoallergenic, nutritionally complete AAF including a prebiotic blend of fructo-oligosaccharides and the probiotic strain Bifidobacterium breve M-16V. Control formula was AAF without synbiotics.ResultsA total of 35 (test) and 36 (control) subjects were randomized; HBR included 51 infants. At week 8, the median percentage of bifidobacteria was higher in the test group than in the control group (35.4% vs. 9.7%, respectively; P<0.001), whereas ER/CC was lower (9.5% vs. 24.2%, respectively; P<0.001). HBR levels of bifidobacteria and ER/CC were 55% and 6.5%, respectively.ConclusionAAF including specific synbiotics, which results in levels of bifidobacteria and ER/CC approximating levels in the HBR group, improves the fecal microbiota of infants with suspected non-IgE-mediated CMA.
Burden of diarrhea in the eastern mediterranean region, 1990-2013 : Findings from the global burden of disease study 2013
Khalil, Ibrahim ; Colombara, Danny V. ; Forouzanfar, Mohammad Hossein ; Troeger, Christopher ; Daoud, Farah ; Moradi-Lakeh, Maziar ; Bcheraoui, Charbel El; Rao, Puja C. ; Afshin, Ashkan ; Charara, Raghid ; Abate, Kalkidan Hassen ; Abd El Razek, Mohammed Magdy ; Abd-Allah, Foad ; Abu-Elyazeed, Remon ; Kiadaliri, Aliasghar Ahmad ; Akanda, Ali Shafqat ; Akseer, Nadia ; Alam, Khurshid ; Alasfoor, Deena ; Ali, Raghib ; AlMazroa, Mohammad A. ; Alomari, Mahmoud A. ; Salem Al-Raddadi, Rajaa Mohammad ; Alsharif, Ubai ; Alsowaidi, Shirina ; Altirkawi, Khalid A. ; Alvis-Guzman, Nelson ; Ammar, Walid ; Antonio, Carl Abelardo T. ; Asayesh, Hamid ; Asghar, Rana Jawad ; Atique, Suleman ; Awasthi, Ashish ; Bacha, Umar ; Badawi, Alaa ; Barac, Aleksandra ; Bedi, Neeraj ; Bekele, Tolesa ; Bensenor, Isabela M. ; Betsu, Balem Demtsu ; Bhutta, Zulfiqar ; Abdulhak, Aref A. Bin; Butt, Zahid A. ; Danawi, Hadi ; Dubey, Manisha ; Endries, Aman Yesuf ; Faghmous, Imad M.D.A. ; Farid, Talha ; Farvid, Maryam S. ; Farzadfar, Farshad ; Fereshtehnejad, Seyed Mohammad ; Fischer, Florian ; Anderson Fitchett, Joseph Robert ; Gibney, Katherine B. ; Mohamed Ginawi, Ibrahim Abdelmageem ; Gishu, Melkamu Dedefo ; Gugnani, Harish Chander ; Gupta, Rahul ; Hailu, Gessessew Bugssa ; Hamadeh, Randah Ribhi ; Hamidi, Samer ; Harb, Hilda L. ; Hedayati, Mohammad T. ; Hsairi, Mohamed ; Husseini, Abdullatif ; Jahanmehr, Nader ; Javanbakht, Mehdi ; Beyene, Tariku ; Jonas, Jost B. ; Kasaeian, Amir ; Khader, Yousef Saleh ; Khan, Abdur Rahman ; Khan, Ejaz Ahmad ; Khan, Gulfaraz ; Khoja, Tawfik Ahmed Muthafer ; Kinfu, Yohannes ; Kissoon, Niranjan ; Koyanagi, Ai ; Lal, Aparna ; Abdul Latif, Asma Abdul ; Lunevicius, Raimundas ; Abd El Razek, Hassan Magdy ; Majeed, Azeem ; Malekzadeh, Reza ; Mehari, Alem ; Mekonnen, Alemayehu B. ; Melaku, Yohannes Adama ; Memish, Ziad A. ; Mendoza, Walter ; Misganaw, Awoke ; Ibrahim Mohamed, Layla Abdalla ; Nachega, Jean B. ; Nguyen, Quyen Le ; Nisar, Muhammad Imran ; Peprah, Emmanuel Kwame ; Platts-Mills, James A. ; Pourmalek, Farshad ; Qorbani, Mostafa ; Rafay, Anwar ; Rahimi-Movaghar, Vafa ; Ur Rahman, Sajjad ; Rai, Rajesh Kumar ; Rana, Saleem M. ; Ranabhat, Chhabi L. ; Rao, Sowmya R. ; Refaat, Amany H. ; Riddle, Mark ; Roshandel, Gholamreza ; Ruhago, George Mugambage ; Saleh, Muhammad Muhammad ; Sanabria, Juan R. ; Sawhney, Monika ; Sepanlou, Sadaf G. ; Setegn, Tesfaye ; Sliwa, Karen ; Sreeramareddy, Chandrashekhar T. ; Sykes, Bryan L. ; Tavakkoli, Mohammad ; Tedla, Bemnet Amare ; Terkawi, Abdullah S. ; Ukwaja, Kingsley ; Uthman, Olalekan A. ; Westerman, Ronny ; Wubshet, Mamo ; Yenesew, Muluken A. ; Yonemoto, Naohiro ; Younis, Mustafa Z. ; Zaidi, Zoubida ; Sayed Zaki, Maysaa El; Rabeeah, Abdullah A. Al; Wang, Haidong ; Naghavi, Mohsen ; Vos, Theo ; Lopez, Alan D. ; Murray, Christopher J.L. ; Mokdad, Ali H. - \ 2016
American Journal of Tropical Medicine and Hygiene 95 (2016)6. - ISSN 0002-9637 - p. 1319 - 1329.

Diarrheal diseases (DD) are leading causes of disease burden, death, and disability, especially in children in low-income settings. DD can also impact a child's potential livelihood through stunted physical growth, cognitive impairment, and other sequelae. As part of the Global Burden of Disease Study, we estimated DD burden, and the burden attributable to specific risk factors and particular etiologies, in the Eastern Mediterranean Region (EMR) between 1990 and 2013. For both sexes and all ages, we calculated disability-adjusted life years (DALYs), which are the sum of years of life lost and years lived with disability. We estimate that over 125,000 deaths (3.6% of total deaths) were due to DD in the EMR in 2013, with a greater burden of DD in low-and middle-income countries. Diarrhea deaths per 100,000 children under 5 years of age ranged from one (95% uncertainty interval [UI] = 0-1) in Bahrain and Oman to 471 (95% UI = 245-763) in Somalia. The pattern for diarrhea DALYs among those under 5 years of age closely followed that for diarrheal deaths. DALYs per 100,000 ranged from 739 (95% UI = 520-989) in Syria to 40,869 (95% UI = 21,540-65,823) in Somalia. Our results highlighted a highly inequitable burden of DD in EMR, mainly driven by the lack of access to proper resources such as water and sanitation. Our findings will guide preventive and treatment interventions which are based on evidence and which follow the ultimate goal of reducing the DD burden.

PPP1, a plant-specific regulator of transcription controls Arabidopsis development and PIN expression
Benjamins, René ; Barbez, Elke ; Ortbauer, Martina ; Terpstra, Inez ; Lucyshyn, Doris ; Moulinier-Anzola, Jeanette ; Khan, Muhammad Asaf ; Leitner, Johannes ; Malenica, Nenad ; Butt, Haroon ; Korbei, Barbara ; Scheres, Ben ; Kleine-Vehn, Jürgen ; Luschnig, Christian - \ 2016
Scientific Reports 6 (2016). - ISSN 2045-2322

Directional transport of auxin is essential for plant development, with PIN auxin transport proteins representing an integral part of the machinery that controls hormone distribution. However, unlike the rapidly emerging framework of molecular determinants regulating PIN protein abundance and subcellular localization, insights into mechanisms controlling PIN transcription are still limited. Here we describe PIN2 PROMOTER BINDING PROTEIN 1 (PPP1), an evolutionary conserved plant-specific DNA binding protein that acts on transcription of PIN genes. Consistent with PPP1 DNA-binding activity, PPP1 reporter proteins are nuclear localized and analysis of PPP1 null alleles and knockdown lines indicated a function as a positive regulator of PIN expression. Furthermore, we show that ppp1 pleiotropic mutant phenotypes are partially reverted by PIN overexpression, and results are presented that underline a role of PPP1-PIN promoter interaction in PIN expression control. Collectively, our findings identify an elementary, thus far unknown, plant-specific DNA-binding protein required for post-embryonic plant development, in general, and correct expression of PIN genes, in particular.

A review of earthworm impact on soil function and ecosystem services
Blouin, M. ; Hodson, M.E. ; Delgado, E.A. ; Baker, G. ; Brussaard, L. ; Butt, K.R. ; Dai, J. ; Dendooven, L. ; Peres, G. ; Tondoh, J.E. ; Cluzeau, D. ; Brun, J.J. - \ 2013
European Journal of Soil Science 64 (2013)2. - ISSN 1351-0754 - p. 161 - 182.
polycyclic aromatic-hydrocarbons - northern hardwood forests - south-eastern australia - ray computed-tomography - organic-matter dynamics - oil-contaminated soil - pb/zn mine tailings - nitrous-oxide n2o - lumbricus-terrestris - plant-growth
Biodiversity is responsible for the provision of many ecosystem services; human well-being is based on these services, and consequently on biodiversity. In soil, earthworms represent the largest component of the animal biomass and are commonly termed ecosystem engineers'. This review considers the contribution of earthworms to ecosystem services through pedogenesis, development of soil structure, water regulation, nutrient cycling, primary production, climate regulation, pollution remediation and cultural services. Although there has been much research into the role of earthworms in soil ecology, this review demonstrates substantial gaps in our knowledge related in particular to difficulties in identifying the effects of species, land use and climate. The review aims to assist people involved in all aspects of land management, including conservation, agriculture, mining or other industries, to obtain a broad knowledge of earthworms and ecosystem services.
Engaging geographies of public art: The case of Paul McCarthy’s ‘Butt Plug Gnome’ in Rotterdam.
Zebracki, Martin - \ 2012
Engaging geographies of public art: indwellers, the 'Butt Plug Gnome' and their locale
Zebracki, M.M. - \ 2012
Social & Cultural Geography 13 (2012)7. - ISSN 1464-9365 - p. 735 - 758.
This paper focuses on particularities of indwellers' perceptions of public art and its locale by drawing on the epistemology of ‘situated knowledges’ (Haraway 1991, Simians, Cyborgs, and Women: The Reinvention of Women. New York: Routledge) and the notion of ‘geographies of engagement’ (Zebracki, Van Der Vaart and Van Aalst 2010, Geoforum 41(5): 786–795). We employ the case of Paul McCarthy's internationally acclaimed public artwork Santa Claus in Rotterdam to illustrate the sundry outlooks on its spatialities, aesthetics and moralities, and its functionalities in relation to place. Santa Claus's alleged sexual nature is highly disputed among local politicians and the local population. This dispute is narratively covered by media sources and inscribed by its popular renaming as the ‘Butt Plug Gnome’. We empirically situate documented media views within the way indwellers perceive Santa Claus and its experienced locale in interrelation with themselves. We try to open up differential vistas on public-art narration in relation to people, time and space, whereby we elaborate on the reflexive idea of ‘social relationality’ (Massey and Rose 2003, Personal Views: Public Art Research Project. Milton Keynes: The Open University) by revealing how socio-spatial differences in public-art narration are negotiated. As such, we examine how public art is geographically reconstituted through the publics, namely those for whom public art is essentially intended yet who have been neglected actors of analysis in public-art research.
Determination of perfluorinated alkyl acid concnetrations in biological standard reference materials
Reiner, J.L. ; O'Connell, S.G. ; Butt, C.M. ; Kwadijk, C.J.A.F. - \ 2012
Analytical and Bioanalytical Chemistry 404 (2012)9. - ISSN 1618-2642 - p. 2683 - 2692.
marine food-web - perfluoroalkyl contaminants - perfluorooctane sulfonate - human plasma - great-lakes - water - samples - serum - environment - matrices
Standard reference materials (SRMs) are homogeneous, well-characterized materials used to validate measurements and improve the quality of analytical data. The National Institute of Standards and Technology (NIST) has a wide range of SRMs that have mass fraction values assigned for legacy pollutants. These SRMs can also serve as test materials for method development, method validation, and measurement for contaminants of emerging concern. Because inter-laboratory comparison studies have revealed substantial variability of measurements of perfluoroalkyl acids (PFAAs), future analytical measurements will benefit from determination of consensus values for PFAAs in SRMs to provide a means to demonstrate method-specific performance. To that end, NIST, in collaboration with other groups, has been measuring concentrations of PFAAs in a variety of SRMs. Here we report levels of PFAAs and perfluorooctane sulfonamide (PFOSA) determined in four biological SRMs: fish tissue (SRM 1946 Lake Superior Fish Tissue, SRM 1947 Lake Michigan Fish Tissue), bovine liver (SRM 1577c), and mussel tissue (SRM 2974a). We also report concentrations for three in-house quality-control materials: beluga whale liver, pygmy sperm whale liver, and white-sided dolphin liver. Measurements in SRMs show an array of PFAAs, with perfluorooctane sulfonate (PFOS) being the most frequently detected. Reference and information values are reported for PFAAs measured in these biological SRMs.
Vooral chrysant en radijs zijn vatbaar: Rhizoctonia veroorzaakt voet- en wortelrot
Arkesteijn, M. ; Paternotte, S.J. - \ 2011
Onder Glas 8 (2011)4. - p. 9 - 9.
glastuinbouw - teelt onder bescherming - plantenziekteverwekkende schimmels - rhizoctonia - bodemschimmels - wortelrot en voetrot - plantenziekten - gewasbescherming - groenten - snijbloemen - greenhouse horticulture - protected cultivation - plant pathogenic fungi - rhizoctonia - soil fungi - root and butt rots - plant diseases - plant protection - vegetables - cut flowers
Rhizoctonia solani is een algemeen voorkomende bodemschimmel, die vooral schade veroorzaakt aan het begin van de teelt. Het is de veroorzaker van voet- en wortelrot in diverse groenten en bloemen in de vollegrond, zoals sla, chrysant, aster, hortensia, celosia en trachelium. In teeltbedden komt de ziekte in mindere mate voor en in steenwol niet.
Vooral paprika, maar ook tomaat, komkommer, courgette en aubergine: Fusarium solani veroorzaakt wortel-, voet- en stengelrot
Paternotte, S.J. - \ 2011
Onder Glas 8 (2011)2. - p. 24 - 24.
glastuinbouw - glasgroenten - fusarium - wortelrot en voetrot - plantenziekteverwekkende schimmels - ziektepreventie - vruchtgroenten - groenten - greenhouse horticulture - greenhouse vegetables - root and butt rots - plant pathogenic fungi - disease prevention - fruit vegetables - vegetables
Testen van middelen tegen Fusarium-voetrot in komkommer
Hofland-Zijlstra, J.D. ; Paternotte, S.J. ; Hamelink, R. - \ 2009
Bleiswijk : Wageningen UR Glastuinbouw (Rapport / Wageningen UR Glastuinbouw 231) - 18
cucumis - fusarium - fungiciden - wortelrot en voetrot - plantenziekten - glastuinbouw - gewasbescherming - fungicides - root and butt rots - plant diseases - greenhouse horticulture - plant protection
In het najaar 2008 is bij WUR Glastuinbouw in Bleiswijk een onderzoek uitgevoerd naar middelen die aantasting door Fusarium-voetrot kunnen voorkomen. Het eerdere onderzoek in 2007 had namelijk nadelige effecten ondervonden van fytotoxiciteit van enkele middelen, terwijl tegelijkertijd de controleplanten niet werden aangetast door Fusarium. Het eerste doel van dit onderzoek was om in een kasproef opnieuw na te gaan welke middelen een aantasting door Fusarium kunnen voorkomen. Hiertoe zijn vier middelen getest. Een tweede doel was om na te gaan in hoeverre DNA analyses een goede indicatie te geven van de aanwezigheid van Fusarium-voetrot in het sybstraatsysteem.
Morus alba L. nature's functional tonic
Butt, M.S. ; Nazir, A. ; Tauseef Sultan, M. ; Schroën, C.G.P.H. - \ 2008
Trends in Food Science and Technology 19 (2008)10. - ISSN 0924-2244 - p. 505 - 512.
root bark - diabetic-rats - ldl oxidation - leaf extract - cardiovascular-diseases - antioxidant activities - cerebral-ischemia - herbal extracts - deficient mice - blood-glucose
Currently, importance of natural products is being revitalized to alleviate various health discrepancies. The link between health and diet is well documented and the consumers' trend reflects conscience towards their dietary habits. Probing these links has led to the emergence of functional, nutraceuticals and pharma foods, now taking hold over global nutrition market. Phytochemicals in diet could provide protection against several threats like free radical formation, degenerative disorders and lifestyle related diseases but still role of array of active ingredients should be unveiled. The review is intended to focus on rich phytochemistry of Morus alba L., its antioxidant potential, inhibition of LDL oxidation, neurodegenerative disorders and mode of action in boosting skin tone. It has a unique nutritional profile containing proteins, phenolics, flavonoids and anthocyanins that enhances its significance as promising nature's functional tonic. Chemistry of mulberry leaves enumerate that it contains some antimicrobial agents like kuwanon G and leachianone etc. Mulberry extracts or components especially flavonoids i.e. quercetin, rutin and isoquercitrin scavenge free radicals showing potential against oxidative stress. Presence of prenylated flavonoids further strengthened its antioxidant claims. Additionally, these antioxidants provide cardiovascular protection as these inhibit LDL oxidation and thus atherosclerosis. Likewise, some other components such as 1-deoxynojirimycin (DNJ) and Moran 20K have been reported to be effective against hyperglycemia and lipid peroxidation in diabetics. Mulberry leaves as protein source in food formulations and neuroprotective functions can be used against neurodegenerative disorders such as Alzheimer and Parkinsonism. Furthermore, it also demands special consideration to improve skin tone. Chemopreventive potential has been highlighted in some studies but still researchers should pay attention to validate the findings to enhance meticulousness.
Resultaten van middelentoets tegen Fusarium-voetrot in komkommer
Hofland-Zijlstra, J.D. ; Paternotte, S.J. ; Hamelink, R. - \ 2008
Bleiswijk : Wageningen UR Glastuinbouw (Rapport / Wageningen UR Glastuinbouw 180) - 18
cucumis sativus - komkommers - fusarium - wortelrot en voetrot - plantenziekteverwekkende schimmels - ziektebestrijding - fungiciden - glastuinbouw - cucumbers - root and butt rots - plant pathogenic fungi - disease control - fungicides - greenhouse horticulture
Effect van groencompost op uitval van Begonia door Fusarium foetens
Noort, F.R. van - \ 2006
Wageningen : Praktijkonderzoek Plant en Omgeving (PPO) (Rapporten PPO Glastuinbouw ) - 12
begonia - fusarium - plantenziekten - wortelrot en voetrot - compost - plant diseases - root and butt rots - composts
Surface forces in a confined polymer melt : self-consistent field analysis of full and restricted equilibrium cases
Leermakers, F.A.M. ; Butt, H.J. - \ 2005
Physical Review. E, Statistical nonlinear, and soft matter physics 72 (2005)2. - ISSN 1539-3755 - p. 1 - 10.
interacting chain molecules - adsorbed polystyrene - statistical-theory - solid-surfaces - 2 plates - adsorption - layers - films - cyclohexane - shear
In full equilibrium the self-consistent field theory for a homopolymer melt confined between two surfaces predicts pronounced oscillatory interaction forces on the monomer length scale. However, when not all the polymer molecules can reversibly equilibrate with the bulk, the trapped molecules may be squeezed, adding a repulsive contribution to the interaction energy. The classical constrained or restricted equilibrium approach by Scheutjens and Fleer two decades ago to deal with this for polymers adsorbed from dilute solutions, breaks down in semidilute and concentrated polymer solutions. We present a generalized restricted equilibrium ansatz applicable also for concentrated polymer solutions. The key idea is that only the adsorbed polymer molecules, i.e., molecules that touch the surface at least once, are forced to remain inside the gap, whereas the nonadsorbing chains are free to move out of the gap when the surfaces approach each other. As in dilute solutions, the forces found in confined melt with trapped adsorbed chains become repulsive. We analyse the dependence of the interaction forces both in full as well as in restricted equilibrium cases as a function of the chain length and the interactions with the surface for a compressible polymer melt.
Interaction between two solid surfaces across PDMS : influence of chain length and end group
Sun, G.X. ; Stark, R. ; Kappl, M. ; Leermakers, F.A.M. ; Butt, H.J. - \ 2005
Composite Interfaces 12 (2005)8-9. - ISSN 0927-6440 - p. 805 - 815.
adsorbed polymer layers - atomic-force microscopy - thin-film - melts - equilibrium - shear - dna - scattering - tribology - viscosity
Forces between solid surfaces across polymer melts are poorly understood despite their importance for adhesion and composite materials. Using an atomic force microscope (AFM) this force was measured for poly(dimethyl siloxane) (PDMS) on silicon oxide. The influence of molecular weight (4.0-40 kDa) was studied. Forces are attractive for low and repulsive for high molecular weight. In addition, changing the terminal methyl group for a hydroxyl group leads to an increased probability of bridging.
Knolrot in waterlelie 311058 : invloed bewaartemperatuur op het ontstaan van knolrot 311058-01 : invloed teeltomstandigheden op divers uitgangsmateriaal 311058-02 : invloed droog of drijvend bewaren op het ontstaan van knolrot 311058-03 : diagnose monsters 311058-04
Böhne, S. - \ 2004
Boskoop : Praktijkonderzoek Plant & Omgeving, Sector Bomen - 28
nuphar - nymphaea - wortelrot en voetrot - landbouwkundig onderzoek - nederland - root and butt rots - agricultural research - netherlands
Knolrot in waterlelie is een algemeen voorkomend probleem, dat soms ineens voor veel uitval kan zorgen. Het uitgangsmateriaal is duur en daarnaast is oppotten en uitplanten behoorlijk arbeidsintensief. Ernstige uitval zorgt daarom voor een aanzienlijke kostenpost. Voor bestrijding van knolrot in waterlelie is het allereerst van belang de veroorzaker te vinden. Aanvankelijk werd vermoed dat een bepaalde schimmel verantwoordelijk was voor de ziekte, echter dat bleek niet het geval. Uit het onderzoek kwamen aanwijzingen dat een bacterie mogelijk een rol speelt, maar ook dat kon niet worden aangetoond. Uit de inventarisatie in het project Consultancy (nr. 312000) in 2002/2003 kwam naar voren dat knolrot mogelijk tijdens de bewaring (transport) ontstaat.
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