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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Olfaction in vector-host interactions
Takken, W. ; Knols, B.G.J. - \ 2010
Wageningen : Wageningen Academic Publishers (Ecology and control of vector-borne diseases vol. 2) - ISBN 9789086860913
gastheren (dieren, mensen, planten) - gewervelde dieren - hematofage geleedpotigen - ziekten overgebracht door vectoren - gastheer parasiet relaties - vectoren - vectorbestrijding - hosts - vertebrates - haematophagous arthropods - vector-borne diseases - host parasite relationships - vectors - vector control
This book addresses the topic how blood-feeding arthropods interact with their vertebrate hosts. As the transmission of infectious vector-borne pathogens is much dependent on the contact between vector and host, the efficacy of host location is of profound importance. Interruption of vector-host contact is considered on of the most effective means of vector-borne disease control, as is currently witnessed by the successful use of insecticide-treated bed nets for malaria control in sub-Saharan Africa.
Top predators: hot or not? A call for systematic assessment of biodiversity surrogates
Cabeza, M. ; Arponen, A. ; Teeffelen, A.J.A. van - \ 2008
Journal of Applied Ecology 45 (2008)3. - ISSN 0021-8901 - p. 976 - 980.
indicator groups - species richness - priority areas - conservation surrogates - vascular plants - performance - vertebrates - diversity - reserves - rare
argue that top predators are justified conservation surrogates based on a case study where raptor presence is associated with high species richness of birds, butterflies and trees. 2. We question the methodology as well as the applicability of their results, and clarify differences between surrogates for biodiversity hotspots and surrogates for complementarity. We show that the results from Sergio et al. related to richness hotspots are not fully reliable and that the ability of top predators to identify complementary areas is not demonstrated. Given that complementarity-based surrogate studies have produced mixed results for a variety of reasons, we clarify some methodological misunderstandings while encouraging further testing of functional groups as biodiversity surrogates. 3. Synthesis and applications. We call for caution in making generalizations, and emphasize that case studies on the use of surrogates should be conducted in a systematic manner. This will facilitate robust assessment across studies regarding the usefulness of particular species groups as biodiversity surrogates.
Detection of hybridization and species identification in domesticated and wild quails using genetic markers
Amaral, A.J. ; Silva, A.B. ; Grosso, A.R. ; Chikhi, L. ; Bastos-Silveira, C. ; Dias, D. - \ 2007
Folia Zoologica 56 (2007)3. - ISSN 0139-7893 - p. 285 - 300.
coturnix-c.-japonica - multilocus genotype data - population-structure - mitochondrial genome - dna - primers - number - individuals - vertebrates - simulation
Hybridization is particularly widespread in birds and can affect species status and recovery. The common quail Coturnix coturnix is a protected game species that has undergone significant population decrease due to habitat changes. The release of Japanese quail C. japonica and or hybrids for restocking has been occurring since the 1970¿s. Both species have not developed reproductive isolating mechanisms and hybridization is occurring. Species distinction based on morphology and male callings is difficult. In this work cytochrome b gene and five microsatellite loci were used with the aim of establishing an identification test for quails sampled in Portugal. Cytochrome b gene revealed to be of promising use to identify the quail maternal lineage. Success in species assignment with the studied microsatellite loci was moderate to identify samples with suspicion of being hybrids with common quail maternal lineage.
10 Year trend of levels of organochlorine pollutants in Antarctic seabirds
Brink, N.W. van den - \ 2003
earth science - human dimensions - environmental impacts - contaminant level/spills - biological classification - animals - vertebrates - birds - biosphere - ecological dynamics - ecotoxicology - toxicity levels
Contaminants like PCBs and DDE have hardly been used Antarctica. Hence, this is an excellent place to monitor global background levels of these organochlorines. In this project concentrations in penguins and petrels will be compared to 10 years ago, which will show time trends of global background contamination levels. Data set description From several birds from Hop Island, Rauer Islands near Davis, samples were collected from preenoil (oil that birds excrete to preen their feathers. This preenoil was then analysed for organochlorine pollutants like polychlorinated biphenyls, (PCBs), hexachlorobenzene (HCB), DDE and dieldrin. The species under investigation were the Adelie penguin (Pygoscelis adeliae) and the Southern Fulmar (Fulmarus glacialoides). The samples were collected from adult breeding birds, and stored in -20 degrees C as soon as possible. The analysis was done with relatively standard but very optimised methods, using a gas-chromatograph and mass-selective detection.
Steenuil handige hulp bij plaagdierenbestrijding
Schuring, W. - \ 2003
De Boomkwekerij 16 (2003)35. - ISSN 0923-2443 - p. 15 - 15.
houtachtige planten als sierplanten - plantenplagen - insecten - gewervelde dieren - biologische bestrijding - populatiedichtheid - natuurbescherming - ornamental woody plants - plant pests - insects - vertebrates - biological control - population density - nature conservation
Steenuilen ruimen insecten en muizen op. Helaas neemt de populatie af. Laanboomkwekers in het rivierengebied doen mee aan het beschermen van de steenuil.
Assignment of FUT8 to chicken chromosome band 5q1.4 and to human chromosome 14q23.2-->q24.1 by in situ hybridization. Conserved and compared synteny between human and chicken
Coullin, Ph. ; Crooijmans, R.P.M.A. ; Groenen, M.A.M. ; Heilig, R. ; Mollicone, R. ; Oriol, R. ; Candelier, J.J. - \ 2002
Cytogenetic and Genome Research 97 (2002)3-4. - ISSN 1424-8581 - p. 234 - 238.
fucosyl-transferase genes - cdna cloning - evolution - alpha-1,6-fucosyl-transferase - purification - vertebrates - expression - alpha - cells
The human FUT8 gene is implicated in crucial developmental stages and is overexpressed in some tumors and other malignant diseases. Based on three different experiments we have assigned the FUT8 gene to chromosome bands 14q23.2 --> q24.1 and not 14q24.3 as previously shown (Yamaguchi et al., 1999). We found a high degree of identity between human and chicken FUT8 sequences. We mapped the chicken FUT8 gene to chromosome 5q1.4 in an internal rearrangement of a region of conserved synteny described between human 14q and chicken chromosome 5. Based on these findings we propose a new gene position correspondence between chicken and human comparative maps. Copyright (C) 2002 S. Karger AG, Basel.
Grazers in Vlielands duin; evaluatie van runderbegrazing in duinvalleien op Vlieland; deel 2: onderzoek in 2001
Wingerden, W.K.R.E. van; Nijssen, M. ; Slim, P.A. ; Burgers, J. ; Kats, R.J.M. van; Dobben, H.F. van; Noordam, A.P. ; Martakis, G.F.P. ; Esselink, H. ; Jagers op Akkerhuis, G.A.J.M. - \ 2002
Wageningen : Alterra (Alterra-rapport 626) - 99
begrazing - vegetatie - rundvee - duinen - duinplanten - ongewervelde dieren - gewervelde dieren - fauna - afgrazen - betula pubescens - calamagrostis epigejos - carex arenaria - empetrum nigrum - prunus avium - eutrofiëring - nederland - friesland - nederlandse waddeneilanden - biodiversiteit - natuurbeheer - Vlieland - waddeneilanden - grazing - vegetation - cattle - dunes - duneland plants - invertebrates - vertebrates - browsing - eutrophication - netherlands - dutch wadden islands
We evaluated seven years of light cattle grazing of dune valleys (Wadden island of Vlieland) as to management objectives and effects on vegetation, flora and fauna. We compared data from 1993 and 2000 in a Before-After/Control-Impact design of 14 grazed and 14 ungrazed plots which were randomly selected from the vegetation strata 'grass encroached moist dune valleys' and 'intact Empetrum vegetation'. To elucidate effects on vegetation and fauna extra data were collected on heavy grazed sites, xerothermobiont fauna species, vertebrate fauna species, raised groundwater tables and historic vegetation descriptions. Development towards shrub- and woodland is tempered, but not stopped, as a consequence of cattle browsing on Prunus avium and Betula pubescens. Cattle forms bare patches and trails in the dense and high field layers of Calamagrostis epigejos and Carex arenaria and mean vegetation height of these layers was stabilised. Due to light grazing a clear gradient in grazing activity was found in the field which shifted between years. Grazing had only light to neutral effects on vegetation and fauna diversity. Changes in plant and fauna species composition and diversity were most related to a general change to moist conditions due to several years with high precipitation.
Corridors of the Pan-European ecological network: concepts and examples for terrestrial and freshwater vertebrates
Foppen, R.P.B. ; Bouwma, I.M. ; Kalkhoven, J.T.R. ; Dirksen, J. ; Opstal, S. van - \ 2000
Tilburg : European Centre for Nature Conservation - ISBN 9789076762050 - 56
ecologie - verspreiding - gewervelde dieren - fragmentatie - europa - waterorganismen - migratie - terrestrische ecosystemen - netwerken - ecology - dispersal - vertebrates - fragmentation - europe - aquatic organisms - migration - terrestrial ecosystems - networks
Polychlorinated biphenyls pattern analysis: potential nondestructive biomarker in vertebrates for exposure to cytochrome P450-inducing organochlorines
Brink, N.W. van den; Ruiter-Dijkman, E.M. de; Broekhuizen, S. ; Reijnders, P.J.H. ; Bosveld, A.T.C. - \ 2000
Environmental Toxicology and Chemistry 19 (2000)3. - ISSN 0730-7268 - p. 575 - 581.
bodemverontreiniging - polychloorbifenylen - gewervelde dieren - niet-destructief testen - biochemische merkers - biologische monitoring - soil pollution - polychlorinated biphenyls - vertebrates - nondestructive testing - biochemical markers - biomonitoring
Biomarkers are valuable instruments to assess the risks from exposure of organisms to organochlorines. In general, however, these biomarkers are either destructive to the animal of interest or extremely difficult to obtain otherwise. In this paper, we present a nondestructive biomarker for exposure to cytochrome P450-inducing organochlorines. This marker is based on a pattern analysis of metabolizable and nonmetabolizable polychlorinated biphenyl (PCB) congeners, which occur in several kinds of tissues (and even blood) that can be obtained without serious effects on the organism involved. The fraction of metabolizable PCB congeners is negatively correlated with exposure to PCBs, which are known to induce specific P450 isoenzymes. This relation can be modeled by a logistic curve, which can be used to define critical levels of exposure. In addition, this method creates an opportunity to analyze biomarker responses in archived tissues stored at standard freezing temperatures (-20°C), at which responses to established biomarkers deteriorate. Furthermore, this method facilitates attribution of the enzyme induction to certain classes of compounds.
Occupational pesticide exposure among Kenyan agricultural workers : an epidemiological and public health perspective
Ohayo - Mitoko, G.J.A. - \ 1997
Agricultural University. Promotor(en): J.S.M. Boleij; H. Kromhout; Maria Koelen. - S.l. : Ohayo-Mitoko - ISBN 9789054857747 - 254
beroepskwalen - toxische stoffen - toxicologie - gewasbescherming - pesticiden - nadelige gevolgen - gewervelde dieren - mens - kenya - occupational disorders - toxic substances - toxicology - plant protection - pesticides - adverse effects - vertebrates - man
<br/>This study was part of the Kenyan component of a multi-centre epidemiologic survey, the East African Pesticides Project. The general objective was to assess the health hazards posed by pesticide handling, storage and use in agricultural estates and small farms in selected rural agricultural communities in Kenya where cotton, tobacco, flowers and other horticultural crops are grown, with a view to developing strategies for the prevention and control of pesticide poisoning. 666 agricultural workers, 120 agricultural extension workers and 108 health care workers from Naivasha, Wundanyi, Homabay and Migori comprised the study population. It was found that the 370 formulations registered for use in Kenya by the Pest Products Control Board (PCPB), represented 217 active ingredients. About 22% of the volume imported were highly hazardous, 20%, moderately hazardous, 45% slightly hazardous and the rest, unclassified. Acetylcholinesterase inhibition occurred in agricultural workers ( 390 exposed; 276 unexposed) as a result of exposure to organophosphate and carbamate pesticides. Acetylcholinesterase levels of 29.6% of exposed individuals were depressed to values below 60% of baseline. Workers from Naivasha had the largest inhibition (36%), followed by Homabay (35%), and Wundanyi (33%); workers from Migori had by far, the least inhibition (26%). Empirical modelling techniques were used to identify and quantify factors affecting exposure to cholinesterase-inhibiting pesticides. The models were adequate as they explained 57-70% of the observed variability in acetylcholinesterase. There was no significant difference in personal hygiene practices between areas. Access to a washing and bathing facility had a positive effect while washing hands and bathing was found to be more reactive than proactive. Spraying had a more profound effect on cholinesterase levels than mixing of pesticides. It has also been shown that workers who sprayed less hazardous pesticides had less inhibition than their counterparts who sprayed more toxic pesticides. However, hardly any variability existed in factors such as personal protective devices and hygienic behaviour within areas, thereby limiting the power of the models to detect the effects of these potential factors affecting exposure. The prevalence of symptoms in this population was described in order to relate levels of inhibition to reported symptoms and to evaluate at which inhibition levels symptoms become elevated. The prevalence of symptoms was found to be higher during the high exposure period than during the low exposure period in the exposed subjects. The presence of a relationship between acetylcholinesterase inhibition, acetylcholinesterase level and respiratory, eye and central nervous system symptoms was established. Increased symptom prevalence was observed at acetylcholinesterase levels which are generally considered as non-adverse. The knowledge, perceptious, observed and reported practices were assessed for the population of agricultural workers. Knowledge was found to be low with regard to safe use of pesticides. For instance the most important route of occupational exposure to pesticides. Practices such as storage, mixing and application were found to be generally poor. Personal hygiene practices were good but the use of personal protective devices was low especially among farmers in Homabay and Migori. The knowledge, perceptions and practices of agricultural extension workers was assessed with respect to safe handling of pesticides. About one third of the extension workers did not know the pesticide operations responsible for poisoning. All the extension workers reported that they were involved with advising on the use of pesticides but only 80% gave advise on safe use. About two thirds of the extension workers felt that pesticides poisoning was a minor problem. They emphasized following of instructions, use of personal protective clothing and devices as well as personal hygiene to prevent poisoning. Knowledge, perceptions and practices of health care workers were also assessed with respect to diagnosis, management and prevention of pesticide poisoning. Only about one fifth of the health care workers thought pesticide poisoning was a major problem in the community. Most of the health care workers were able to provide information on the health aspects of pesticides but less than ten percent of this information was directed at the farmers. Diagnosis of poisoning was found to be difficult with only one third of the health care workers reporting that they had seen at least one case of pesticide poisoning in the duration of time that they worked in this agricultural area. Almost all health care workers reported that they would like information and training as well as drugs and antidotes for the management and treatment of poisoning. Lack of knowledge, poor perceptions and practices at all levels as well as the availability and use of the more toxic pesticides were found to be major factors influencing pesticide poisoning. It is necessary to urgently initiate interventions to address the gaps found. The results of this study will facilitate the development of effective multi-faceted strategies for the management, prevention and control of occupational pesticide exposure in Kenya and other developing countries.
Herkomst en differentiatie van sex-cellen bij gewervelde dieren, speciaal bij vissen.
Timmermans, L.P.M. - \ 1996
Wageningen : Landbouwuniversiteit Wageningen - 35
gewervelde dieren - vissen - gameten - celdifferentiatie - geslachtsdifferentiatie - vertebrates - fishes - gametes - cell differentiation - sex differentiation
Landschapsecologische kartering Nederland : vogels, zoogdieren, amfibieen en reptielen : toelichting bij de bestanden Fauna-A en Fauna-C van de LKN-database
Tamis, W.L.M. ; Zelfde, M. van 't - \ 1995
Wageningen etc. : SC-DLO [etc.] (LKN rapport 9)
dieren - biogeografie - fauna - landschap - landschapsecologie - zoogdieren - mortaliteit - nederland - populatiedichtheid - populatie-ecologie - populatiegroei - gewervelde dieren - animals - biogeography - landscape - landscape ecology - mammals - mortality - netherlands - population density - population ecology - population growth - vertebrates
Effect fytase en fosforgehalten in het voer bij vleeskalkoenen
Veldkamp, T. ; Klis, J.D. van der - \ 1994
Praktijkonderzoek voor de Pluimveehouderij 5 (1994)3. - ISSN 0924-9087 - p. 31 - 34.
beenderen - enzymen - voer - vleesproductie - mineralen - fosfor - skelet - kalkoenen - gewervelde dieren - vitaminetoevoegingen - vitaminen - bones - enzymes - feeds - meat production - minerals - phosphorus - skeleton - turkeys - vertebrates - vitamin supplements - vitamins
In april 1994 is in samenwerking met ID-DL0 een experiment uitgevoerd met vleeskalkoenen. Daarin is nagegaan hoeveel microbieel fytase nodig is om een hoeveelheid fosfor uit fytaat vrij te maken, die gelijkwaardig is aan 1 gram fosfor uit mononatriumfosfaat.
Botsterkte van leghennen
Niekerk, Th. van - \ 1994
Praktijkonderzoek voor de Pluimveehouderij 5 (1994)3. - ISSN 0924-9087 - p. 8 - 11.
huisvesting, dieren - dierenwelzijn - beenderen - samenstelling - enzymen - voer - hennen - skelet - gewervelde dieren - vitaminetoevoegingen - vitaminen - animal housing - animal welfare - bones - composition - enzymes - feeds - hens - skeleton - vertebrates - vitamin supplements - vitamins
De botsterkte van leghennen wordt door diverse factoren beonvloed. In dit artikel wordt ingegaan op de effecten van huisvesting, verlichting, diergewicht en voer met fytase op de botsterkte.
Neural regulation and dynamics of prolactin secretion in the rat = Neurale regulatie en dynamiek van de prolactine secretie in de rat
Wiersma, J. - \ 1990
Agricultural University. Promotor(en): L.M. Schoonhoven; L.M.A. Akkermans. - S.l. : Wiersma - 69
ratten - prolactine - hersenen - gewervelde dieren - neurofysiologie - zenuwstelsel - neurologie - hormonen - metabolisme - rats - prolactin - brain - vertebrates - neurophysiology - nervous system - neurology - hormones - metabolism
<p><TT>The subject of this thesis was an investigation of the neural regulation and dynamics of prolactin (Prl) secretion. Experimentation was performed with freely behaving undisturbed male and female rats, chronically fitted with an atrial blood sampling catheter. In some studies rats were also equipped with a chronic intracerebroventricular cannula, or with chronic metal electrodes bilaterally implanted in the medial preoptic area (MPOA) or the median eminence (ME). Stress was always carefully avoided. The animals, therefore, had a post-operative recovery period of at least one week, during which time they were handled daily and fully accustomed to the experimental situation. During experimentation blood samples were collected between 06.00 and 22.00 h. Blood volume reduction was compensated for with blood transfusions.</TT><p><TT>The study starts with a thorough evaluation of circulating (Prl) levels in cycling and pseudopregnant (PSP) rats (chapter 1). Onehour interval studies show that diestrous (Prl) levels were low, about 15 ng/ml, and showed minor fluctuations. During the afternoon and early night of proestrus a single (Prl) surge was observed with a peak level of 1100 ng/ml at 17.00 h. On the afternoon of estrus there was also a single surge which was of a smaller magnitude and duration, with a peak level of 400 ng/ml at 16.00 h. In PSP rats two daily (Prl) surges were released during successively 11 days, one nocturnal and one diurnal. During the course of PSP these surges gradually declined in magnitude. Short-time sampling interval studies show that (Prl) secretion during PSP occurred occasionally in substantial bursts from baseline levels, whereas during the afternoon of proestrus plasma (Prl) was elevated constantly due to a more or less continuous release of (Prl) Such a difference in actual secretion patterns indicates a separate neural regulation.</TT><p><TT>These data were obtained in rats chronically fitted with a blood sampling/transfusion catheter. Since (Prl) secretion is extremely susceptible to stress, it was necessary to investigate whether the applied blood sampling/transfusion procedure was free of stress. It appeared that frequent blood sampling for several hours at rates of up to 1 sample/min did not affect normal (Prl) secretion when blood volume reduction was compensated for with blood transfusion of fresh donor blood (chapter 2). However, compensation with preserved blood affected prolactin secretion significantly (chapter 3). In all later studies, therefore, blood transfusions were performed with freshly collected donor blood. The application of high frequency blood sampling permits the assessment of the dynamics of (Prl) secretion satisfactorily. The short-time interval studies presented in chapter 1, 2 and 3 show that during a surge plasma (Prl) always increased in an unpredictable manner, discontinuously, by means of several bursts, with maximum increments of about 600 ng/ml/min. The shortest half-time values, as calculated from the disappearance of (Prl) from the circulation, were about 2.2 min. The individual release patterns indicate that (Prl) release must be the consequence of a very dynamic neural regulatory process.</TT><p><TT>In chapter 4 the effects of red light and/or surgery upon (Prl) secretion were studied in cycling and PSP rats. Nocturnal (07.00- 11.00 h), prediurnal (14.00-17.00 h) and diurnal (19.00-22.00 h) Prl secretion was differently affected by these "treatments", and the effect was dependent upon the physiological state. The data together demonstrate the existence of different regulatory mechanisms for each of the surges of (Prl) secretion: the proestrous and estrous surge in cycling rats, and the nocturnal and diurnal surge in PSP rats. Moreover, in PSP day 0 rats, on the first day of pseudopregnancy, the occurrence of a prediurnal surge, preceeding the diurnal surge, was evident, which in fact was a reflection of the estrous afternoon surge in cycling rats.</TT><p><TT>In the last three chapters the involvement of the brain in (Prl) regulation was explored by studying the effects of hormonal and electrical stimulation upon (Prl) secretion. Since (Prl) has no specific target organ, an autofeedback control mechanism was hypothesized. Therefore, the effect of intracerebroventricular infusion of (Prl) on endogenous Prl secretion was investigated. However, as far as the proestrous surge of (Prl) is concerned, there is no evidence for the existence of an autoregulatory mechanism, neither in the expression, nor in the termination of the surge (chapter 5).</TT><p><TT>In chapter 6 the role of two brain areas in the control of (Prl) was investigated: the MPOA and the ME. The MPOA shows sexual dimorphism and is concerned functionally with several parameters of homeostasis, (sexual) behavior and endocrine function. The ME contains the terminals of the tuberoinfundibular dopaminergic (TIDA) neurons. Electrical stimulation experiments show that the</TT>MPOA<TT>is involved in the control of (Prl) secretion and that this control is different in males and females: electrical stimulation produced an increase in (Prl) secretion in the male, but reduced (Prl) secretion in the proestrous female. ME stimulation data do not provide evidence that this sexually differentiated function of the</TT>MPOA<TT>could be contributed to a sexual dimorphism in prolactin- inhibiting factor or prolactin-releasing factor activity.</TT><p><TT>The data of chapter 7 show that the</TT>MPOA<TT>is involved in the control of all presently known surges of (Prl) secretion in cycling, pregnant and lactating rats: electrical stimulation consistently suppressed (Prl) secretion at the times of expected surges. So the</TT>MPOA<TT>may be considered as an "anti-surge key-control" centre for (Prl) secretion in female rats. Whether the</TT>MPOA<TT>exerts its control via one final common neural pathway represented by the tuberoinfundibular dopaminergic system, remains to be determined.</TT><p><TT>In summary: (Prl) is a multi-target and multi-functional hormone. Based on the differences in actual secretion patterns of (Prl) and the differential effects of stress on (Prl) secretion it is concluded that all yet known surges of (Prl) secretion in cycling, (pseudo) pregnant and lactating rats are controlled by different neural regulatory mechanisms. In proestrous rats there is no evidence for an autoregulatory mechanism. Release of (Prl) is the consequence of a very dynamic neural regulatory process. The release of (Prl) is finally controlled by one common neural centre, the</TT>MPOA,<TT>which control is sexually differentiated: stimulatory in the male and inhibitory in the female.</TT>
De literatuur over Nederlandse aquatische macrofauna tot 1983
Mol, A.W.M. - \ 1985
Leersum : Rijksinstituut voor Natuurbeheer (RIN-rapport nr. 85/21) - 175
macrofauna - waterdieren - zoetwaterdieren - gewervelde dieren - literatuur - nederland - aquatic animals - freshwater animals - vertebrates - literature - netherlands
In dit rapport wordt een overzicht gegeven van alle op Nederlandse wateren betrekking hebbende publikaties en rapporten, waarin ongewervelde zoetwaterdieren (macrofauna) vermeld zijn. Het rapport vormt de schriftelijke vastlegging van databestanden die op het Rijksinstituut voor Natuurbeheer zijn opgeslagen.
De metapodia als voorspellers van formaat en gewicht bij runderen = The metapodia as predictors of size and weight in cattle
Bergstroem, P.L. ; Wijngaarden - Bakker, L.H. van - \ 1983
Zeist etc. : IVO (IVO-rapport. Instituut voor Veeteeltkundig Onderzoek "Schoonoord" no. B-206) - 45
beenderen - rundvee - massa - skelet - gewervelde dieren - gewicht - bones - cattle - mass - skeleton - vertebrates - weight
Verslag van een onderzoek naar het verband tussen de grootte van deze botten (homoloog met onze middenvoetbeentjes) als maat voor de grootte en het levend gewicht van runderen, op grond van waarnemingen bij stiertjes (Nederlands zwartbont en roodbont en Jersey). Deze botten zijn vaak de enige botten die bij archeologische vondsten intakt worden aangetroffen. Kennis van een dergelijk verband is daarom met name van belang om een voorstelling te kunnen maken van de praehistorische landbouwkundige situatie
Orienterend onderzoek naar de aanwezigheid van vluchtige N-nitrosaminen in herbiciden
Broekhoven, L.W. van; Davies, J.A.R. - \ 1983
Wageningen : Centrum voor Agrobiologisch Onderzoek (CABO-verslag no. 47) - 7
gewasbescherming - herbiciden - toxische stoffen - organische verbindingen - pesticiden - nadelige gevolgen - gewervelde dieren - mens - xenobiotica - plant protection - herbicides - toxic substances - organic compounds - pesticides - adverse effects - vertebrates - man - xenobiotics
De verspreiding van bestrijdingsmiddelen vanuit vliegtuigen in relatie tot het risico van de mens
Anonymous, - \ 1981
Wageningen : Pudoc (Literatuurlijst / Centrum voor Landbouwpublikaties en Landbouwdocumentatie no. 4533)
gewasbescherming - toediening via de lucht - pesticiden - nadelige gevolgen - gewervelde dieren - mens - pesticidenresiduen - persistentie - bibliografieën - milieuhygiëne - plant protection - aerial application - pesticides - adverse effects - vertebrates - man - pesticide residues - persistence - bibliographies - environmental hygiene
Mutagene werking van bestrijdingsmiddelen op mais
Anonymous, - \ 1979
Wageningen : Pudoc (Literatuurlijst / Centrum voor landbouwpublikaties en landbouwdocumentatie no. 4225)
gewasbescherming - plagenbestrijding - ziektebestrijding - zea mays - maïs - pesticiden - nadelige gevolgen - gewervelde dieren - mens - bibliografieën - plant protection - pest control - disease control - maize - pesticides - adverse effects - vertebrates - man - bibliographies
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