Browsing Qatar University Science Journal - [From 1981 TO 2007] by Author "Rizk, A. M."

Now showing items 1-8 of 8

    • The amino acid composition of some Common marine algae from Qatar (Arabian Gulf) 

      Heiba, H. I. [حلمي اسماعيل هيبة]; Al-Nagdy, S. A.; Rizk, A. M.; Durgham, M. M. ( Qatar University , 1993 , Article)
      The most dominant twenty algal species representing the main three groups of benthic macroalgae, Chlorophyceae, Phaeophyceae and Rhodophyceae were collected from the coastal zones of the Qatar peninsula. The algae were ...

    • Constituents Of Centaurea Species 

      Al Easa, H. S. [هالة سلطان العيسى]; Rizk, A. M. ( Qatar University , 1992 , Article)
      A comprehensive review of Centaurea species including all the isolated consituents is given. The biological activities of the studied species are also reported.

    • Constituents Of Cymbopogon Species 

      Heiba, H. I. [حلمي اسماعيل هيبة]; Rizk, A. M. ( Qatar University , 1986 , Article)
      A comprehensive review of the Cymbopogon species including the essential oils and their constituents is given. An account of the other components viz. non volatile terpenoids and phenolic compounds is also given. The ...

    • Constituents Of Green Beans Phaseolus Vulgaris (Lipids And Flavonoids) 

      Rizk, A.M.; Ismail, S.I.; Azzam, S.A.; Wood, G. ( Qatar University , 1992 , Article)
      Chemical study of the lipid fraction resulted in the isolation and identification of a hydrocarbon fraction (n-Czg -0-033); an aliphatic alcohol fraction (C^, Czp, €30) and a sterol fraction (stigmasterol and sitosterol). ...

    • Constituents of plants growing in Qatar xxiv phytochemical investigation of salvia aegyptiaca L. 

      El Missiry, M. M. [مصطفى محمود المسيري]; Hussiney, H. A.; Ismail, S. I.; Radwan, H. M.; Rizk, A. M. ( Qatar University , 1994 , Article)
      The study of the flavonoids revealed the isolation and identification of luteolin, luteolin 7-O- glucoside, apigenin and apigenin 7-0 glucoside; their identity was proved by m.p., TLC, UV, IR and MS. Moreover, a coumarin ...

    • 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 ...

    • Ecological and phytochemical studies on the "miswak", salvadora persica l. 

      Ma'ayergi, H. A. [حسن المعايرجي]; Ismail, S. I.; Batanouny, K. H.; Rizk, A. M. ( Qatar University , 1984 , Article)
      The "Miswak", which is produced from the stolons and branches of Salvadora persica is used as a substitute for ordinary tooth brushes. The use of "Miswak" has been recommended by Islam. It is endowed by several characteristics ...

    • Methylated Flavonoids From Artemisia Monosperma 

      Ismail, S. I. [شمس الدين امبابي اسماعيل]; Hammouda, F. M.; Rizk, A. M.; Hassan, N. M. ( Qatar University , 1989 , Article)
      Investigation of the flavonoid constituents of Artemisia monosperma resulted in the isolation and identification of four methylated flavonoids: quercetin 3,3',4'-trimethylether, diosmetin (luteolin 4'-methylether), ...