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