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.
Permeability of cell membranes of pressed baker's yeast was estimated by estimating the decline in concentration of the permeating substance. Therefore it was necessary to know the amount of water imbibed in the cell walls, the free water in the cells, and the imbibed water of the dispersed colloidal phase (protoplasm) in the cells.With correction for the dispersed colloidal phase, the yeast cells behaved according to the law of Boyle Mariotte van 't Hoff. The uptake of substances by yeast cells was estimated chemically. Inorganic cations and anions were taken up according to lyotropic range, Ca 2+ < Mg 2+ < Na + < K + < NH 4+ and S0 42- < Cl - < N0 3- ,Uptake of organic acids depended closely on their degree of dissociation. Of the sugars tested lactose did not permeate, whereas glucose was rapidly adsorbed by the cell surface. Some substances were adsorbed by the disperse phase (K + and urea).
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