Leny Krijbolder

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Low density lipoproteins (LDL) were conjugated to colloidal gold for investigation of the ultrastructural aspects of binding and receptor-mediated internalization of LDL by cultured endothelial cells from the human umbilical artery and vein. The number of LDL receptors was increased by preincubation in lipoprotein-depleted serum. When the cells were(More)
Using the methods reported by De Fossard et al. (11) the influence of various media constituents on the growth and the alkaloid and anthraquinone production in Cinchona ledgeriana callus cultures was studied. Growth and indole alkaloid production (e.g. cinchonamine) was improved by higher auxin levels. The best growth was observed in the light, although(More)
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