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.
Five isolates of the beetle-transmitted cowpea mosaic virus were studied. The symptoms produced by each on a number of hosts were described. The occurrence of amorphous inclusion bodies in the epidermal cells of infected cowpea and pea plants was reported. A purification procedure was described. Three peaks were invariably associated with the purified virus in the analytical ultracentrifuge, the sedimentation coefficients of these components being 58, 100 and 119 S after separation. The components could be purified by density-gradient centrifugation. The top component was not infective; the middle component was far more infective than the bottom component. Purified preparations showed, by electron-microscopy, polyhedral particles of about 25 mμdiameter. Negative staining of the preparations with phosphotungstate revealed empty particles, and of particles apparently containing nucleic acid. An icosahedral model with 60 subunits and 5: 3: 2 axial symmetry was most compatible with the structure of the particles seen on the electron-micrographs. On the basis of homologous and heterologous serological reactions the five isolates could be divided into two groups. They proved also to be serologically related to bean pod mottle virus and to an isolate of red clover mottle virus.
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