Union Catalogue of Agricultural Libraries in the Netherlands
The WUR Library Catalogue contains bibliographic data on books and periodicals held by the libraries of Wageningen University and Research Centre and some 15 associated libraries. Holding data are added to each record.
Subjects covered include Agrotechnology, Food and Food Production, Plant and Animal Sciences, Soil Science, Geo-information, Landscape and Spatial Planning, Water and Climate, Ecosystem Studies, Economics and Society.
The joint collections of the participating libraries cover a substantial part of the internationally available scientific literature in these disciplines.
As far as Dutch scientific literature in these fields is concerned, coverage can be considered near 100%, including much of the so-called "grey literature".
All titles are entered in their original language. Keywords are added to facilitate subject searching.
The database is updated every day and now contains over 830.000 records.
To clarify the mechanism of transmission by aphids of a non-persistent virus, some aspects of this transmission were studied. The structure of the stylets was examined by optical and electron-microscope. Unknown ridges were observed near the apices of the maxillary and mandibulary stylets. The path of the stylets into the host plant was traced by oil-immersion microscopy into pieces of stripped epidermis. Evidence was obtained that virus was picked up by the aphid from the middle lamella of the transverse cell walls of the epidermis. Transmission by aphids of virus from pieces of stripped epidermis of diseased leaves was much more difficult than transmission from intact leaves. An attempt was made to find the cause of this hampered transmission. Virus was readily transmitted mechanically from dead tissue, but aphids could transmit virus only if tissue was living. It was concluded that the virus transmitted by aphids was in a form different from that transmitted mechanically.
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