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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In de spinazie op jouw bord, zitten genen die ik verzameld heb
Kik, Chris - \ 2018
Op jacht naar sterke zaden
Kik, Chris - \ 2018

Onderzoeker en "seed hunter" Chris Kik reist de hele wereld over om wilde groente zaden te zoeken. Dankzij die zaden kunnen we sterke groenten kweken. Hoe zit dat precies?

Spinazie in de schappen duurzamer dankzij Wageningse verzamelexpedities
Kik, C. - \ 2018
Wageningen :
Rapid loss of seed viability in ex situ conserved wheat and barley at 4°C as compared to −20°C storage
Treuren, R. van; Bas, N. ; Kodde, J. ; Groot, S.P.C. ; Kik, C. - \ 2018
Conservation Physiology 6 (2018)1. - ISSN 2051-1434
Genebanks aim to optimize their storage conditions in order to postpone seed ageing as long as possible. As most genebanks have a relatively short life history, empirical data about seed longevity during ex situ storage are almost absent. Based on seed characteristics, theoretical predictions indicate that cereal seeds can be stored without substantial loss of viability for time periods exceeding 100 years, even under temperatures of a few degrees above zero. Here we present the results of a germination study in wheat and barley, comparing genebank seed samples maintained at different temperatures for 23–33 years. Wheat and barley seed samples stored at −20°C showed a mean germination of 94% and 90%, respectively, indicating no loss of the initial viability determined for the accessions prior to introduction in the collection. Seed samples maintained at 4°C showed a mean germination of 62% for wheat and 75% for barley. In addition to the observed loss of viability, the 4°C samples also showed a loss in vigour as the time period to reach their final germination was about twice as long compared to the −20°C samples. A subset of the wheat accessions tested in 2011 were retested in 2017, showing further reduction in mean germination to 35% for the 4°C samples, while the −20°C samples remained stable at 95%. Several 4°C samples were even close to a complete loss of viability. Considering that wheat and barley are generally regarded as good maintainers, the rapid loss of seed viability observed in the present study indicates that the ex situ seed storage of genetic resources at 4°C should be treated with caution by genebanks, particularly when used for long-term conservation.
A comparison of UVb compact lamps in enabling cutaneous vitamin D synthesis in growing bearded dragons
Diehl, J.J.E. ; Baines, F.M. ; Heijboer, A.C. ; Leeuwen, J.P. van; Kik, M. ; Hendriks, W.H. ; Oonincx, D.G.A.B. - \ 2018
Journal of Animal Physiology and Animal Nutrition 102 (2018)1. - ISSN 0931-2439 - p. 308 - 316.
25(OH)D - Lizard - Pogona vitticeps - Reptile - Ultraviolet light - Vitamin D - Vitamin D metabolites

The effect of exposure to different UVb compact lamps on the vitamin D status of growing bearded dragons (Pogona vitticeps) was studied. Forty-two newly hatched bearded dragons (<24 h old) were allocated to six treatment groups (n = 7 per group). Five groups were exposed to different UVb compact lamps for two hours per day, with a control group not exposed to UVb radiation. At 120 days of age, blood samples were obtained and concentrations of 25(OH)D3, Ca, P and uric acid were determined. In addition, plasma 25(OH)D3 concentration was determined in free-living adult bearded dragons to provide a reference level. Only one treatment resulted in elevated levels of 25(OH)D3 compared to the control group (41.0 ± 12.85 vs. 2.0 ± 0.0 nmol/L). All UVb-exposed groups had low 25(OH)D3 plasma levels compared to earlier studies on captive bearded dragons as well as in comparison with the free-living adult bearded dragons (409 ± 56 nmol/L). Spectral analysis indicated that all treatment lamps emitted UVb wavelengths effective for some cutaneous vitamin D synthesis. None of these lamps, under this regime, appeared to have provided a sufficient UVb dose to enable synthesis of plasma 25(OH)D3 levels similar to those of free-living bearded dragons in their native habitat.

Postmortaal onderzoek van bruinvissen (Phocoena phocoena) uit Nederlandse wateren, 2017 : biologische gegevens, gezondheidsstatus en doodsoorzaken
IJsseldijk, L.L. ; Kik, M.J.L. ; Gröne, A. - \ 2017
Wageningen : Wettelijke Onderzoekstaken Natuur & Milieu (WOt-technical report 116) - 49
This annual report present the results of post-mortem examinations of porpoises (Phocoena phocoena) in 2017. One of the main objectives of the research is to quantify human-induced causes of death. In 2017, 55 dead harbour porpoises were examined: 25 males and 30 females, including 22 adults, 26 juveniles and 7 neonates. Most of the harbour porpoises examined died as a result of infectious diseases (36%), bycatch (20%) or grey seal attacks (18%). The proportion of animals dying of infectious diseases was higher in 2017 than in previous years.
Vergeten groenten doen het goed bij stadsmensen die snakken naar authentieke ervaringen – maar de business is niet eenvoudig
Kik, Chris - \ 2017
Een Andijker muis op je bord: oude groenterassen
Kik, Chris - \ 2017
Word jij ook zaadvermeerderaar?
Kik, Chris - \ 2017
Report of a melon collecting expedition in Uzbekistan
Kik, C. ; Esankulov, A. - \ 2017
Wageningen : Wageningen UR, Centre for Genetic Resources (CGN report 39) - 26 p.
Report of a Lactuca aculeata collecting expedition in Jordan
Kik, C. ; Abulaila, K. ; Tahabsom, Z. - \ 2017
Wageningen : Wageningen UR, Centre for Genetic Resources (CGN report 40) - 32 p.
Crop diversification in a changing world
Kik, Chris - \ 2017
Kik C (2017). Crop diversification in a changing world. Workshop 4: Accessing plant genetic diversity – what are the obstacles and how can they be overcome? EUCARPIA symposium Mobilizing the green gold of plant genetic resources. Montpellier, Frankrijk, 8–11 mei
The Dutch national genebank CGN: a general introduction
Kik, Chris - \ 2017
Kik C (2017). The Dutch national genebank CGN: a general introduction. NCARE, Baq’a, Jordanie, 9 september
Ik zie door de bomen het bos niet meer: Structuur St. de Oerakker en verbanden met andere organisaties
Kik, Chris - \ 2017
Kik C (2017). Ik zie door de bomen het bos niet meer: Structuur St de Oerakker en verbanden met andere organisaties. Najaarsvergadering St de Oerakker, Wageningen, 29 november
Seed hunter explores Uzbekistan and Jordan
Kik, Chris - \ 2017
Blau de himel, grien it gers, afl. 1
Kik, Chris - \ 2017

Deel 1 van een drieluik korte documentaires over gras

Prevalence of dental disorders in degus and evaluation of diagnostic methods to determine dental disease and its prognosis
Bolhuis, Hester van; Hoffen, Lotte van; Zijll Langhout, Martine van; Engeldorp Gastelaars, Heleen van; Hendriks, Wouter ; Lamberts, Marnix ; Kik, Marja - \ 2017
Veterinary Record 181 (2017)23. - ISSN 0042-4900
apical elongation - calcium - malocclusion - octodon degus - phosphorus - radiography
Degus (Octodon degus) are prone to develop dental disease with deleterious health effects. The two studies reported here aimed to determine the prevalence of dental disorders in degus and to identify and evaluate diagnostic tools for determination of prognosis of these disorders. In study A, health data from 225 degus at AAP, Rescue Center for Exotic Animals in the Netherlands, were collated and the prevalence of dental disorders and differences in sex and age at clinical onset of symptoms associated with dental disorders were described. The prevalence was 34.7 per cent and higher (P<0.01) in males than in females. The occurrence of cheek teeth malocclusion was highly positively (P<0.0001) correlated to mortality. In study B, 36 skulls were examined by macroscopic evaluation, radiography and histology. Additionally, the calcium:phosphorus (Ca:P) of mandibular bone in degus with and without dental disorders were determined. There was no significant (P=0.10) difference in Ca:P between the two groups. Quantifying mandibular apical cheek teeth elongation via macroscopic evaluation was highly correlated (P<0.01) to the results obtained via radiography. Examination for apical elongation by palpation and diagnostic imaging should be included in routine health monitoring of degus. Apical elongation appeared to develop before coronal elongation and when cheek teeth malocclusion occurred, prognosis for recovery of dental disease was poor.
Dode wolf was gezond, maar had al enige tijd niet gegeten
Jansman, Hugh - \ 2017

De eerst resultaten van het onderzoek naar de dode wolf zijn bekend. Patholoog Marja Kik (DWHC, faculteit Diergeneeskunde): "Interessant om te vermelden is dat de maag en darmen, op lintwormen na, geheel leeg waren. Het dier had dus al even niet gegeten, mogelijk zo'n 48 uur.

Complete genome sequence of a Frog Virus 3-like ranavirus from an Oophaga pumilio frog imported to the Netherlands
Saucedo, Bernardo ; Hughes, J. ; Suárez, Nicolás ; Haenen, O.L.M. ; Voorbergen-Laarman, H.A. ; Gröne, Andrea ; Kik, Marja J.L. ; Beurden, S.J. van - \ 2017
Environmental surveillance during an outbreak of tularaemia in hares, the Netherlands, 2015
Janse, Ingmar ; Maas, M. ; Rijks, J.M. ; Koene, M. ; Plaats, R.Q. van der; Engelsma, M. ; Tas, P.W.L. ; Braks, M. ; Stroo, A. ; Notermans, D.W. ; Vries, M.C. de; Reubsaet, F.A.G. ; Fanoy, E. ; Swaan, C.M. ; Kik, M.J. ; Ijzer, J. ; Jaarsma, R.I. ; Wieren, S. van; Roda Husman, A.M. de; Passel, M. van; Roest, H. ; Giessen, J. van der - \ 2017
Eurosurveillance 22 (2017)35. - ISSN 1025-496X
Tularaemia, a disease caused by the bacterium Francisella tularensis, is a re-emerging zoonosis in the Netherlands. After sporadic human and hare cases occurred in the period 2011 to 2014, a cluster of F. tularensis-infected hares was recognised in a region in the north of the Netherlands from February to May 2015. No human cases were identified, including after active case finding. Presence of F. tularensis was investigated in potential reservoirs and transmission routes, including common voles, arthropod vectors and surface waters. F. tularensis was not detected in common voles, mosquito larvae or adults, tabanids or ticks. However, the bacterium was detected in water and sediment samples collected in a limited geographical area where infected hares had also been found. These results demonstrate that water monitoring could provide valuable information regarding F. tularensis spread and persistence, and should be used in addition to disease surveillance in wildlife.
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