Browsing by Author "Al-Easa H.S."
Now showing items 1-8 of 8
-
Chemical survey of some plants Growing in Qatar
Rizk, A.M.; Heiba, H.I.; Al-Easa, H.S. (1989 , Other)Fifty one plants growing in Qatar, belonging to thirty families, were surveyed for alkaloids, anthraquinones, coumarins, flavonoids, tannins and saponins. The medicinal uses of these plants arereported. -
Constituents of Plants Growing in Qatar, Part XXX: A New Iridoid from Cistanche Phelypaea (L) COUT
Deyama, T.; Yahikozawa, K.; Al-Easa, H.S.; Rizk, A.M. (1995 , Article)New iridoid named phelypaeside (1) was isolated from the dried aerial parts of Cistanche phelypae (Orobanchaceae) growing in Qatar -
Constituents of Plants Growing in Qatar, Part XXXI: Lipid constituents of seventeen range plants growing in Qatar
Al-Easa, H.S.; Rizk, A.M.; Heiba, H.I. (2002 , Article)A preliminary study on the nutritive values of 17 Qatari range plants -
Constituents of plants growing in Qatar: part xxviii. Constituents Of cistanche phelypaea
Deyama, T.; Yahikozawa, K.; Al-Easa, H.S.; Rizk, A.M. ( Qatar University , 1995 , Article)Ten compounds were isolated from the methanolic extract of the aerial parts of Cistanche phelypaea (Orobanchaceae) and identified as echinacoside (1), tubuloside A (2), tubuloside E (3), acteoside (4), 2'-acetylacteoside ... -
Design and optimization of a luminescent Samarium complex of isoprenaline: A chemometric approach based on Factorial design and Box-Behnken response surface methodology
Sakr M.; Hanafi R.; Fouad M.; Al-Easa H.; El-Moghazy S. ( Elsevier B.V. , 2019 , Article)A chemometrically optimized procedure has been developed for the determination of isoprenaline (ISO) in the parent substance as well as in its respective pharmaceutical preparation. It is worth mentioning that although ... -
Phospholipid fatty acid composition of nine marine sponges from Qatar
Njinkoue, J.M.; Barnathan, G.; Al Muftah, A.R.; Al Easa, H.; Vacelet, J.; Kornprobst, J.M.... more authors ... less authors ( IFREMER , 1998 , Conference Paper)Phospholipid fatty acid composition was studied in sponge from Qatar including eight Demospongia and one Calcarea. More than 60 fatty acids were identified in each species as methyl esters and N-acyl pyrrolidides by gas ... -
Plackett-Burman and Box-Behnken designs as chemometric tools for micro-determination of L-Ornithine
Elazazy M.S.; El-Hamshary M.; Sakr M.; Al-Easa H.S. ( Elsevier B.V. , 2018 , Article)Plackett-Burman (PB) and Box-Behnken (BB) screening and response surface factorial designs were used to evaluate spectrophotometric and spectrofluorimetric approaches for the determination of l-Ornithine (ORN) as per se ... -
Substituted 2-aminobenzothiazoles salicylidenes synthesis and characterization as cyanide sensors in aqueous medium
Elsafy A.G.; Al-Easa H.S.; Hijji Y.M. ( MDPI AG , 2018 , Article)(E)-2-((benzo[d]thiazol-2-ylimino)methyl)-4-nitrophenol 1 and (E)-2-(((6-methoxybenzo[d]thiazol-2-yl)imino)methyl)-4-nitrophenol 2 were synthesized efficiently under microwave conditions. The structures were confirmed using ...