Résumé
This investigation was carried out to study the effect of some fertilizers and growth regulators separately and the interaction between them, on growth, alkaloidal concentration and yield of Catharanthus roseus plant. All the fertilization levels increased plant height, number of leaves and branches per plant, dry weight of leaves and roots per plant as well as alkaloidal concentration. The growth regulators used were gibberellin, cycocel and ethrel. Gibberellin at 100 ppm markedly increased the vegetative growth characters, alkaloidal concentration and yield in the different plant organs. Significant increase in these characters resulted from the combined treatment between the high fertilization level [N300 P150 K75 kg/feddan] and the different concentration of gibberellin and cycocel. On the other hand, reduction in these characters was observed with the combined treatments between ethrel concentrations and different fertilization levels
Sujets)
Alcaloïdes , Économie , Substances de croissanceRésumé
Isolation and purification of the antibiotic produced by Nematospora coryli and comparison of its physicochemical and biological properties with those of griseofulvin from Penicillium griseofulvin are described. This comparison revealed that the isolated antibiotic from N. coryli was identical with griseofulvin
Sujets)
Griséofulvine/analyseRésumé
This paper describes a new TLC method which gives an excellant resolution of the 12 alkaloids present in curare resin. The method is simple, suitable for isolation of [+]-tubocurarine alkaloid and the interferred unknown alkaloid in commercial curare resin. The unidentified laevorotatory alkaloid gives rise to particular problems in the production of pure d-tubocurarine chloride as it interferes in the crystallization process of d-tubocurarine. Pure crystalline [+]-tubocurarine and the unidentified alkaloid can be prepared by this method. It is also suitable for control analysis of commercial curare resin and [+]-tubocurarine chloride alkaloid