The present study aimed to determine the phytoconstituent compositions of the leaves of four Ziziphus jujuba ecotypes (Choutrana, Mahdia, Mahres and Sfax). The chromatographie peaks of 18 compounds, including nine major fatty acids, live sterols, two triterpene alcohols and two methysterols, were quan tified by the capillary gaseous chromatography method. The major fatty acids identified were linolenic (42.04%) and palmitic (23.04%). Unsaturated fatty acids ranged between 53% and 60%. The predominant sterols (mg/100 g) were 13-sitosterol (4036) and stigmasterol (24. 18). Cycloartenol (68.55 mg/100 g) and citrostadienol (12.27 mg/lOOg) were the major metylsterols. Methylene cydoartanol ranged between 1.2 mg/100 g (Sfax) and 1.5 mg/100 g (Mahdia). Total phenolic content measured by Folin-ciocalteux ranged from 3.97 mg GAE/g to 6.04 mg GAE/g. The predominant flavonoids identified by HPLC were apigenin (6.1 mg/g) and rutin (1.91 mg/g). The fatty acids and flavonoids in the Z. jujuba leaves were responsible for their therapeutic and phar maceutical effects. This could explain whyTunisian people traditionally use it as medicine to treat several pathologies.
Seven simple and advanced dynamic polymorphic functions were considered to develop a dominant height growth model for Spanish and Tunisian cork oak forests. Data from 115 stem analyses performed in two regions in each country were used to fit the equations. Parameter estimates were obtained using the Dummy variable method. Both numerical, graphical and biological consistency were used to compare alternative models. The dynamic equation finally selected was derived from the Hossfeld model by considering the shape parameter to be related to site productivity. An analysis of the dominant height growth patterns between the two countries indicated that the same dominant height growth model was valid for both countries. This dominant height growth model allows estimation of dominant height with a level of reliability of at least 83% from an age of 15 years for a prediction interval of less than 40 years.
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