Personal Information

  • Position : Professor Emeritus
  • Department : Chemistry
  • Specification :
  • Work Phone : 2403866/057
  • Email : snayyad@mans.edu.eg

E-Courses

Researches

  1. In vitro and in vivo study of cucurbitacins-type triterpene glucoside from Citrullus colocynthis growing in Saudi Arabia against hepatocellular carcinoma
  2. Antioxidant, cytotoxic, antitumor, and protective DNA damage metabolites from the red sea brown alga Sargassum sp
  3. Laurene-type sesquiterpenes from the Red Sea red alga Laurencia obtusa as potential antitumor–antimicrobial agents
  4. Cytotoxic hydroazulene diterpenes from the brown alga Cystoseira myrica
  5. Three new cembranoid-type diterpenes from Red Sea soft coral Sarcophyton glaucum: Isolation and antiproliferative activity against HepG2 cells
  6. Bioactive C15 acetogenins from the red alga Laurencia obtusa
  7. Cytotoxic and protective DNA damage of three new diterpenoids from the brown alga Dictoyota dichotoma
  8. Rare pyrane-based cembranoids from the Red Sea soft coral Sarcophyton trocheliophorum as potential antimicrobial–antitumor agents
  9. Inhibitory effects of extracts from the marine alga Caulerpa taxifolia and of toxin from Caulerpa racemosa on multixenobiotic resistance in the marine sponge Geodia cydonium
  10. Insecticidal Metabolites from the Green Alga Caulerpa racemosa
  11. Otteliones A and B:  Potently Cytotoxic 4-Methylene-2-cyclohexenones from Ottelia alismoides
  12. New cytotoxic isoprenoid derivatives from the Red Sea soft coral Sarcophyton glaucum
  13. The role of new eudesmane-type sesquiterpenoid and known eudesmane derivatives from the red alga Laurencia obtusa as potential antifungal–antitumour agents
  14. The structural determination of a new steroidal metabolite from the brown alga Sargassum asperifolium
  15. A review of steroids from Sarcophyton species
  16. Caulerpine: An antitumor indole alkaloid from Caulerpa racemosa
  17. Toward Computing Relative Configurations: 16-e pi-Latrunculin B, a New Stereoisomer of the Actin Polymerization Inhibitor Latrunculin B
  18. Cytotoxic neviotane triterpene-type from the red sea sponge Siphonochalina siphonella
  19. Cytotoxic effects of three new metabolites from Red Sea marine sponge, Petrosia sp.
  20. New antimicrobial biscembrane hydrocarbon and cembranoid diterpenes from the soft coral Sarcophyton trocheliophorum
  21. New Cytotoxic Laurene‐, Cuparene‐, and Laurokamurene‐Type Sesquiterpenes from the Red Alga Laurencia obtusa
  22. Selective cytotoxic effects on human breast carcinoma of new methoxylated flavonoids from Euryops arabicus grown in Saudi Arabia
  23. Antibacterial sphingolipid and steroids from the black coral Antipathes dichotoma
  24. Jaceidin Flavonoid Isolated from Chiliadenus montanus Attenuates Tumor Progression in Mice via VEGF Inhibition: In Vivo and In Silico Studies
  25. Two new polyacetylene derivatives from the Red Sea sponge Xestospongia sp.
  26. A new cytotoxic stigmastane steroid from Pistia stratiotes.
  27. Cytotoxic scalarane-type sesterterpenes from the Saudi Red Sea sponge Hyrtios erectus
  28. New Antifungal Cholestane and Aldehyde Derivatives from the Red Alga Laurencia papillosa
  29. Novel nano silica assisted synthesis of azo pyrazole for the sustainable dyeing and antimicrobial finishing of cotton fabrics in supercritical carbon dioxide
  30. Novel synthesis of reactive disperse dyes for dyeing and antibacterial finishing of cotton fabric under scCO2
  31. A new cytotoxic brominated acetylenic hydrocarbon from the marine sponge Haliclona sp. with a selective effect against human breast cancer
  32. A sesquiterpene glucoside from Reichardia tingitana
  33. Evaluation of the brown alga, Sargassum muticum extract as an antimicrobial and feeding additives
  34. Isolation, antimicrobial and antitumor activities of a new polyhydroxysteroid and a new diterpenoid from the soft coral Xenia umbellata
  35. Potent antifouling metabolites from Red Sea organisms
  36. Cytotoxic polyacetylenes from the Red Sea sponge Siphonochalina siphonella
  37. A sesquiterpene ether from Laurencia obtusa
  38. Two new terpenoidal derivatives: a himachalene-type sesquiterpene and 13,14-secosteroid from the soft coral Litophyton arboreum
  39. New cytotoxic indole-type alkaloids obtained from Rhazya stricta leaves
  40. Acyclic diterpenoid from the red alga Gracilaria foliifera
  41. Cytotoxic bicyclic diterpene from the brown alga Sargassum crispum.
  42. Antiproliferative effects of triterpenoidal derivatives, obtained from the marine sponge Siphonochalina sp., on human hepatic and colorectal cancer cells
  43. Cytotoxic metabolites from Callyspongia siphonella display antiproliferative activity by inducing apoptosis in HCT-116 cells
  44. Vincamine and 14-epi-vincamine indole alkaloids from Ambelania occidentalis
  45. Antigenotoxic ketosteroid from the red algae Jania adhaerens
  46. Polymorphisms of interleukin 4 and interleukin 4 receptor genes and bronchial asthma risk among Egyptian children
  47. New cytotoxic cyclic peroxide acids from Plakortis sp. marine sponge
  48. Marine Bioactive Steryl Esters from the Red Sea Black Coral Antipathes dichotoma
  49. New nimbolinin and meliacarpin derivatives from Melia azedarach.
  50. An Efficient and Convenient Synthesis of Certain 2-Thioxothiazole, 2-oxo-1, 2-dihydropridine, 2-Oxo-2H-pyran, 2, 4-diaminothiophene and Pyrazolo [5, 1-c][1, 2, 4] triazine�…
  51. 3β, 7β-Dihydroxy-5α-cholestan-11-one: A new oxidation pattern of cholestane skeleton from Laurencia papillosa
  52. Differential cytotoxic activity of the petroleum ether extract and its furanosesquiterpenoid constituents from Commiphora molmol resin
  53. Bio-active sesquiterpenoids and norsesquiternoids from the Red Sea octocoral Rhytisma fulvum fulvum
  54. Lactones from Pituranthos tortusus
  55. Selective anti-proliferative activity of indole alkaloids from Rhazya stricta Decne leaves
  56. Two New Cytotoxic C-29 Steroids from the Red Sea Brown Alga Cystoseira trinodis
  57. Synthetic approaches to some new fluorescent dyestuffs for synthetic polymer fibres: Synthesis of new 2‐(4′‐Hetarylphenyl)‐1, 2, 3‐triazolo (4, 5‐b) pyrido (1′, 2′‐a�…
  58. Anti-inflammatory, antioxidant, cytotoxic activities, and sesquiterpenoid contents of Paralemnalia thyrsoides
  59. New Diarylheptanoids and a Hydroxylated Ottelione from Ottelia alismoides
  60. A Novel Synthesis of Imidazo (4, 5‐d) azepine Ring System.
  61. Isolation and structure determination of the biologically active sphingolipids from marine sponge Haliclona species
  62. Humulene sesquiterpene lactones from Asteriscus schimperi
  63. Gene Expression Profiling to Delineate the Anticancer Potential of a New Alkaloid Isopicrinine From Rhazya stricta
  64. Cytotoxic ceramides from Antipathes dichotoma
  65. Photooxygenation reactions of natural piperine
  66. Synthesis of 4H-naphtho [1, 2-b] pyrans, benzo [h] coumarins, 4H-naphtho [2, 1-b: 6, 5-b] dipyrans, 4H-naphtho [1, 2-b: 3, 4-b'] dipyrans and pyridine derivatives
  67. Phytochemical composition of Cuminum cyminum and its biological activity
  68. Synthesis and biological assessment of new benzothiazolopyridine and benzothiazolyl-triazole derivatives as antioxidant and antibacterial agents
  69. Chemical investigation and isolation of some constituents from Paralemnalia thyrsoides
  70. Cytotoxic Isoprenoids from the Red Sea Soft Corals Sarcophyton glaucum and Xenia umbellate
  71. Synthetic approaches to some new sulfur-containing heterocycles of anticipated immunosuppressive activity
  72. Two New Bioactive Metabolites from Xestospongia sp. with Antimicrobial and Anticancer Activities
  73. Constituents of onopordon alexandrine
  74. Cytotoxic evaluation of new polyhydroxylated steroids from the Red Sea soft coral Litophyton mollis (Macfadyen, 1936)
  75. New Cytotoxic Monoalkyl Glycerol Ether from the Red Sea Soft Coral Nephthea mollis
  76. The Dual Therapeutic Potential of Ottelione A on Carbon Tetrachloride-induced Hepatic Toxicity in Mice
  77. Cytotoxic and anti-bacterial evaluation of two new aromatic A-ring steroids isolated from the Red Sea soft coral Dendronephthya spp.
  78. Insecticidal and phytochemical investigation of Catharanthus roseus L. extracts to Spodoptera littoralis (Boisd.)
  79. Assessment of toxicological effects of some new plant extracts on cotton aphid, Aphis gossypii
  80. Synthesis of some new bis (pyrazol-5-ols), pyridones and benzo-[f]-thiochromene-2-carbonitrile derivatives bearing N-(4-chlorophenyl)-2-(4-formylphenoxy) acetamide moiety
  81. Avalia��o da alga marrom, extrato de Sargassum muticum, como antimicrobiano e aditivo alimentar
  82. Impact of Ottelione on Gamma-glutamyl transferase and Hematological markers in mice with Liver Fibrosis
  83. Pharmaceutical composition for treating cancer and a method thereof
  84. Antiproliferative effects of cembranoid derivatives obtained from Red Sea soft coral Sarcophyton glaucum on human colorectal cancer cell lines. Adv Mod Oncol Res 2015; 1 (1): 48–55
  85. ccep
  86. Erratum: Bioactive C15 Acetogenins from the Red Alga Laurencia obtusa
  87. ALEKSEEV, EV 013 014 ALEMAN, J. 107 ALMENDROS, P. 167 ALVAREZ DE CIENFUEGOS, L. 046
  88. Molluscicidal activity and chemical constituents of Erythrina ulei against Monacha cartusiana.
  89. -Humulene Sesquiterpene Lactones from Asteriscus schimperi
  90. " Nonet-bracketing" in the H-1 NMR spectrum: Quantification of low levels of water and other solutes in organic solutions.
  91. Sensitivity of human breast carcinoma cells to ottelione a and its analogues.
  92. On the effect of extracts from Ottelia alismoides plant on the monogenean Cichlidogyrus spp. Infesting the gills of cichlid fishes inhabiting Damietta branch of the River Nile
  93. New antitumor agents: Structure and synthesis studies
  94. Reactions on activated nitrites: routes for synthesis of some new fused heterocycles containing-nitrogen
  95. Synthesis of 4h-napththo [1, 2,-b] pyrans, benzo [h] coumarins, 4h-napthto [2, 1, b: 6, 5-b] Dipyrans, 4h-napthto [1, 2-b: 3, 4,-b] dipyaims and piridine derivates
  96. Reaction of 1, 3-dicarbonyl compounds with nitriles: synthesis of pyrazolo [1, 5-c]-1, 2, 4-triazines, pyridines 4H-indeno [1, 2-b] pyran derivatives
  97. Epoxidation of the natural β-snyderol to potential alkylating agents of DNA
  98. Phytochemical study of the red alga laurenica obtusa grown in Egypt
  99. Application of Activated Awiss Mango biosorbent for Dye Industrial Wastewater Treatment
  100. The removal mechanism for methylene blue dye onto mango biosorbents
  101. NEW NIMBOLININ AND MELIACARPIN DERIVATIVES FROM Melia
  102. Ring Expansion of Carbocyclic �-Keto-ester with Acetylenic Esters
  103. MOLLUSCICIDAL ACTIVITY AND CHEMICAL CONSTITUENTS OF