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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    Ternary Complex Formation of Phosphate with Ca and Mg Ions Binding to Ferrihydrite : Experiments and Mechanisms
    Mendez, Juan C. ; Hiemstra, Tjisse - \ 2020
    ACS Earth and Space Chemistry 4 (2020)4. - ISSN 2472-3452 - p. 545 - 557.
    anion-bridged complexes - calcium - CD model - cooperative and synergistic binding - electrostatic interactions - iron oxides nanoparticles - magnesium - surface complexation modeling

    Calcium (Ca) and magnesium (Mg) are the most abundant alkaline-earth metal ions in nature, and their interaction with ferrihydrite (Fh) affects the geochemical cycling of relevant ions, including phosphate (PO4). The interfacial interactions of Ca and Mg (M2+) with PO4 have not been analyzed yet for freshly precipitated Fh. Here, we studied experimentally this interaction in binary M2+-PO4 systems over a wide range of pH, M2+/PO4 ratios, and ion loadings. The primary adsorption data were scaled to the surface area of Fh using a recent ion-probing methodology that accounts for the size-dependent chemical composition of this nanomaterial (FeO1.4(OH)0.2·nH2O). The results have been interpreted with the charge distribution (CD) model, combined with a state-of-the-art structural surface model for Fh. The CD coefficients have been derived independently using MO/DFT/B3LYP/6-31+G*∗ optimized geometries. M2+ and PO4 mutually enhance their adsorption to Fh. This synergy results from the combined effect of ternary surface complex formation and increased electrostatic interactions. The type of ternary complex formed (anion- vs cation-bridged) depends on the relative binding affinities of the co-adsorbing ions. For our Ca-PO4 systems, modeling suggests the formation of two anion-bridged ternary complexes, i.e., (FeO)2PO2Ca and FeOPO3Ca. The latter is most prominently present, leading to a relative increase in the fraction of monodentate PO4 complexes. In Mg-PO4 systems, only the formation of the ternary FeOPO3Mg complex has been resolved. In the absence of Ca, the pH dependency of PO4 adsorption is stronger for Fh than for goethite, but this difference is largely, although not entirely, compensated in the presence of Ca. This study enables the use of Fh as a proxy for the natural oxide fraction, which will contribute to improved understanding of the mutual interactions of PO4 and M2+ in natural systems.

    Quality Management Practices of Gene Banks for Livestock: A Global Review
    Zomerdijk, F. ; Hiemstra, S.J. ; Arbaumont, Maëlle d'; Tixier-Boichard, Michele ; Boettcher, Paul - \ 2020
    Biopreservation and Biobanking (2020). - ISSN 1947-5535
    The genetic diversity of livestock is decreasing and many countries have created gene banks for ex situ–in vitro conservation of animal genetic resources (AnGR). The collection, processing, and storage of animal germplasm require substantial investment and the material collected (and associated data) is highly valuable. Therefore, quality management systems (QMSs) and practices are important. The objective of this study was to review the quality management procedures of livestock gene banks around the world to identify the general strengths and weaknesses of quality control. A survey was administered by means of an online questionnaire consisting of 54 questions, most of which were yes/no with respect to the presence of a particular aspect of quality management. The survey was distributed through networks of the Food and Agriculture Organization of the United Nations that are associated with AnGR. Ninety responses were received from 62 countries. The gene banks were predominantly public institutions, with the main goal of preventing breed extinction. Approximately 30% of the banks reported having a QMS, 15 of which involved formal certification. Many other banks have plans to implement formal quality management within the next 5 years. Regarding specific aspects of quality management, more emphasis was placed on material entering the banks than on eventual utilization. Among the banks processing and freezing material, 90% followed specific standard operating procedures, but only 24% had policies regarding provision of access to external stakeholders. Increased cooperation among livestock gene banks could improve quality management. Sharing of knowledge could standardize procedures and cooperating peers could evaluate each other's QMSs.
    Nieuwe website voor het Europese netwerk voor het behoud van dierrassen
    Hiemstra, Sipke Joost - \ 2020
    Resolving humic and fulvic acids in binary systems influenced by adsorptive fractionation to Fe-(hydr)oxide with focus on UV–Vis analysis
    Xu, Yun ; Bai, Yilina ; Hiemstra, Tjisse ; Tan, Wenfeng ; Weng, Liping - \ 2020
    Chemical Engineering Journal 389 (2020). - ISSN 1385-8947
    Acid precipitation - Adsorptive fractionation - Humic Substances - Iron-oxides - Size exclusion chromatography - UV–Vis spectroscopy

    Humic acid (HA) and fulvic acid (FA) are two operationally defined classes of natural organic matter. In the environment, both materials are present simultaneously and bind in a competitive manner to Fe-(hydr)oxides and other minerals, but their quantification in mixtures is a challenge. In this study, an UV–Vis method was developed to quantify concentrations of HA and FA without and after adsorptive fractionation by an iron oxide (goethite, α-FeOOH). In addition, the performance of the UV–Vis method was compared to that of acid precipitation and size exclusion chromatography (SEC). Among the three methodologies (UV–Vis, acid precipitation, SEC), the UV–Vis method is the most successful in quantifying the ratio of HA to FA subject to fractionation. The UV–Vis method is based on distinct differences in the UV–Vis spectra of HA and FA, including fingerprints in both the spectra shape and intensity. Adsorption to goethite decreased the specific light absorbance of HA and FA, but the changes in spectral shape were not significant enough to cover their differences. The acid precipitation method can also quantify the HA to FA ratio. But to minimize the influence of incomplete HA precipitation or co-precipitation of FA, the concentration of both HA and FA needs to be at least ~20 mgC L−1. The SEC method is not suitable to measure HA and FA after adsorption, because preferential adsorption significantly affects the shape of SEC chromatograms.

    Een nieuwe website voor het CGN
    Menting, Frank ; Hiemstra, Sipke Joost - \ 2020
    Use of iron oxide nanoparticles for immobilizing phosphorus in-situ : Increase in soil reactive surface area and effect on soluble phosphorus
    Koopmans, G.F. ; Hiemstra, T. ; Vaseur, C. ; Chardon, W.J. ; Voegelin, A. ; Groenenberg, J.E. - \ 2020
    Science of the Total Environment 711 (2020). - ISSN 0048-9697
    Immobilization - Iron oxide sludge - Particle size - Phosphate - Siliceous ferrihydrite - Specific surface area

    Phosphorus (P) immobilization has potential for reducing diffuse P losses from legacy P soils to surface waters and for regenerating low-nutrient ecosystems with a high plant species richness. Here, P immobilization with iron oxide sludge application was investigated in a field trial on a noncalcareous sandy soil. The sludge applied is a water treatment residual produced from raw groundwater by Fe(II) oxidation. Siliceous ferrihydrite (Fh) is the major Fe oxide type in the sludge. The reactive surface area assessed with an adapted probe ion method is 211–304 m2 g−1 for the Fe oxides in the sludge, equivalent to a spherical particle diameter of ~6–8 nm. This size is much larger than the primary Fh particle size (~2 nm) observed with transmission electron microscopy. This can be attributed to aggregation initiated by silicate adsorption. The surface area of the indigenous metal oxide particles in the field trial soils is much higher (~1100 m2 g−1), pointing to the presence of ultra-small oxide particles (2.3 ± 0.4 nm). The initial soil surface area was 5.4 m2 g−1 and increased linearly with sludge application up to a maximum of 12.9 m2 g−1 when 27 g Fe oxides per kg soil was added. In case of a lower addition (~10–15 g Fe oxides per kg soil), a 10-fold reduction in the phosphate (P-PO4) concentration in 0.01 M CaCl2 soil extracts to 0.3 µM was possible. The adapted probe ion method is a valuable tool for quantifying changes in the soil surface area when amending soil with Fe oxide-containing materials. This information is important for mechanistically predicting the reduction in the P-PO4 solubility when such materials are used for immobilizing P in legacy P soils with a low P-PO4 adsorption capacity but with a high surface loading.

    Surface area of ferrihydrite consistently related to primary surface charge, ion pair formation, and specific ion adsorption
    Mendez, Juan C. ; Hiemstra, Tjisse - \ 2020
    Chemical Geology 532 (2020). - ISSN 0009-2541
    CD model - Electrolyte ions - Iron nanoparticles - Potentiometric titrations - Probe ions - Surface reactivity

    The specific surface area (SSA) of metal oxides is pivotal for scaling of surface phenomena. For ferrihydrite (Fh), the SSA can be assessed by probing the surface with ions that specifically adsorb (e.g. protons or phosphate). In the approach, an appropriate material with a known surface chemical behavior is used as reference, accounting for differences in e.g. surface sites and structure. As Fh is a nanomaterial, the size-dependency of many of its properties requires a consistent implementation for data analysis and modeling. In the present study, the proton adsorption of Fh was measured in NaNO3, NaCl, and NaClO4 solutions using a potentiometric titration methodology that leads to an internally consistent primary data set (H/Fe). For data interpretation, we employed a size-dependent molar mass, mass density, and chemical composition (FeO1.4(OH)0.2·nH2O), as well as a size-dependent surface curvature since the latter increases the value of the Stern layer capacitance. Using well-crystallized goethite as reference, state-of-the-art multisite complexation modeling discloses the underlying SSA of Fh. Similar to goethite, a significant variation in electrolyte affinity constants (logK) is found for Fh. This largely explains the differences in pHPZC reported in literature when using e.g. KNO3 or NaCl rather than NaNO3 as electrolyte solution. Our data collection was done for Fh materials with a known aging history. The same Fh samples were also probed with phosphate ions and the collected primary data (PO4/Fe) were interpreted with the CD model. This methodology yields SSA values that are consistent with those found by probing the surface of Fh with protons. As ion probing with phosphate is rapid and sensitive, it is recommended as a tool to determine the SSA of Fh materials. This enables the development of a consistent thermodynamic database for application of surface complexation modeling in natural systems.

    Biodiversity and food systems
    Arets, Eric ; Andeweg, Karin ; Conijn, Sjaak ; Hassink, Jan ; Hiemstra, Sipke Joost ; Klapwijk, Lotte ; Lahr, Joost ; Rooijen, Nils van; Wösten, Henk ; Zijlstra, Jelle - \ 2019
    Rationalization and further development of European livestock genebank collections
    Hiemstra, S.J. ; Boettcher, Paul ; Moran, Dominic ; Danchin-Burge, Coralie - \ 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. 362 - 362.

    Food systems and biodiversity : Progress and output 2019
    Arets, E.J.M.M. ; Andeweg, K. ; Conijn, J.G. ; Hassink, J. ; Hiemstra, S.J. ; Klapwijk, C.J. ; Lahr, J. ; Rooijen, Nils van; Wosten, J.H.M. ; Zijlstra, J. - \ 2019
    Wageningen Environmental Research - 21 p.
    Value of gene bank material for the commercial breeding population of Dutch Holstein Friesian cattle
    Windig, J.J. ; Doekes, H.P. ; Veerkamp, R.F. ; Bijma, P. ; Hiemstra, S.J. - \ 2019
    In: Value of gene bank material for the commercial breeding population of Dutch Holstein Friesian cattle. - Wageningen : Wageningen Academic Publishers (Book of Abstracts ) - ISBN 9789086863396 - p. 368 - 368.
    Not all inbreeding is depressing
    Doekes, H.P. ; Veerkamp, R.F. ; Bijma, P. ; Hiemstra, S.J. ; Jong, Gerben de; Windig, J.J. - \ 2019
    In: Book of Abstracts of the 70th Annual Meeting of the European Federation of Animal Science. - Wageningen : Wageningen Academic Publishers (Book of Abstracts ) - ISBN 9789086863396 - p. 142 - 142.
    Inbreeding decreases animal performance (inbreeding depression), but not all inbreeding is expected to be equally harmful. Inbreeding on recent ancestors is expected to be more harmful than inbreeding on more ancient ancestors, because of purging. Purging is the removal of deleterious recessive alleles over time by selection. We investigated the effects of recent and ancient inbreeding on yield, fertility and udder health of 38,792 Holstein Friesian first-parity cows, using linear mixed models. Pedigree data were used to compute traditional inbreeding (FPED) and genotype data were used to identify regions of homozygosity (ROH) and compute ROH-based inbreeding (FROH). Inbreeding depression was apparent, e.g. a 1% increase in FROH was associated with a decrease in 305-d milk yield of 36.3 kg (SE=2.4), an increase in calving interval of 0.48 days (SE=0.15) and an increase in mean somatic cell score in day 150 to 400 of 0.86 units (SE=0.28). Distinguishing recent from ancient inbreeding gave mixed results. For example, only very long ROHs (which indicate recent inbreeding) signicantly increased calving interval, whereas both long and short ROH decreased protein yield. When FPED was split into new and ancestral components, based on whether alleles were identical by descent for the first time or not, there was clear evidence of purging. For example, a 1% increase in new inbreeding was associated with a 2.2 kg (SE=0.4) decrease in protein yield, compared to a 0.9 kg (SE=0.8) increase for ancestral inbreeding. The mixed results may be partly due to difficulties in estimating ancient inbreeding. Distant ancestors are less well registered, and short ROHs may be less reliable than long ROHs. Furthermore, purging may have acted on some, but not all alleles. To conclude, there is purging in the population, but purging effects are only partly rejected by the difference in inbreeding depression due to recent and ancient inbreeding.
    New opportunities of animal reproductive and cryopreservation technologies for breeding and conservation
    Woelders, H. ; Soom, A. van; Stout, T. ; Roelen, B.A.J. ; Hiemstra, S.J. - \ 2019
    Freezing poultry semen; effects of cpa concentration x cooling rate, and other factors
    Woelders, H. ; Wit, A.A.C. de; Hiemstra, S.J. ; Grasseau, Isabelle ; Blesbois, Elisabeth ; Bernal, Berenice ; Santiago-Moreno, Julián - \ 2019
    In: Book of Abstracts of the 70th Annual Meeting of the European Federation of Animal Science. - Ghent : Wageningen Academic Publishers (EAAP Book of abstracts 25) - ISBN 9789086863396 - p. 364 - 364.
    Determining breed purity in local Dutch cattle with a DNA test to increase number of breeding animals
    Hulsegge, B. ; Windig, J.J. ; Hiemstra, S.J. ; Schurink, A. - \ 2019
    - 18 p.
    Book of Abstracts of the 70th Annual Meeting of the European Federation of Animal Science
    Rationalization and further development of gene bank collections
    Hiemstra, Sipke Joost ; Danchin, C. ; Boettcher, P. ; Moran, D. - \ 2019
    Cryoconservation of animal genetic resources in europe and two African countries: A gap analysis
    Leroy, Gregoire ; Boettcher, Paul ; Besbes, Badi ; Danchin-Burge, Coralie ; Baumung, Roswitha ; Hiemstra, Sipke J. - \ 2019
    Diversity 11 (2019)12. - ISSN 1424-2818 - 11 p.
    Breed - Conservation - Ex situ - Gene bank - Livestock - Semen - Sustainable development goal

    Cryoconservation is one of the main strategies to conserve farm animal genetic resources, providing opportunities for genetic improvement and adaptation to changes in production environments and consumer demands. In this study, we combine livestock breed-related data from the Domesticated Animal Diversity Information System (DAD-IS) and information provided by gene banks from 15 European and 2 non-European countries on material stored for livestock breeds to analyze the gaps in cryomaterial collections according to species, countries and various breed categories. Out of the 2949 breeds registered in DAD-IS for these countries, 15.9% have been reported to have material stored in gene banks, but only 4.3% have material sufficient to allow breed reconstitution. The proportion of breeds with stored cryomaterial was greater than 20% for ruminants and pigs, between 10% and 20% for equids, and below 10% for rabbit and avian species. According to the results of two logistic regressions, countries show significant differences in the proportion of populations collected for cryostorage, while breeds not-at-risk are more likely to have cryomaterial preserved than are other breeds. Also, a relatively larger proportion of transboundary breeds have cryomaterial in gene banks than do local breeds, likely due in part to the fact that multiple countries have the opportunity to collect this material. These results highlight the need for increased efforts in material collection for at-risk local breeds and regional coordination on cryoconservation of material from transboundary breeds.

    Enhancing the functioning of farm animal gene banks in Europe: results of the IMAGE project
    Hiemstra, S.J. ; Boettcher, Paul ; Crooijmans, R.P.M.A. ; Danchin-Burge, Coralie ; Leroy, Gregoire ; Moran, Dominic ; Kugle, Waltraud ; Woelders, H. ; Tixier-Boichard, Michele - \ 2019
    In: Proceedings of ESPG conference 23-25 October Prague Czech Republic / Trevil, P., Weigend, S., Prague : - ISBN 9788090744240 - p. 25 - 28.
    Grote verschillen in vatbaarheid voor essentaksterfte
    Hiemstra, J.A. ; Meulenbelt, Arnold - \ 2019
    De Boomkwekerij 2019 (2019)21. - ISSN 0923-2443 - p. 24 - 26.
    Wageningen Plant Research en BTL Bomendienst onderzoeken de weerbaarheid van verschillende essensoorten en -cultivars die aangeplant zijn in stedelijk groen. Verschillen in vatbaarheid voor essentaksterfte blijkt tot nog toe heel groot te zijn.
    Verschillen in gevoeligheid voor essentaksterfte heel groot
    Hiemstra, J.A. ; Meulenbelt, Arnold - \ 2019
    Tuin en Landschap 2019 (2019)16/17. - ISSN 0165-3350 - p. 44 - 47.
    Wageningen Plant Research en BTL Bomendienst hebben beide onderzoek gedaan anar de weerbaarheid van verschillende essensoorten en -cultivars. In TenL 23 van 2016 beschrijven ze de opzet en achtergrond van de onderzoeken. In dit artikel zijn de resultaten te lezen; welke soorten en cultivars meer of minder vatbaar zijn voor de ziekte.
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