Personal Information

  • Position : Professor Emeritus
  • Department : Chemistry
  • Specification :
  • Work Phone : 2403866/057
  • Email : snayyad@du.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. Cytotoxic and protective DNA damage of three new diterpenoids from the brown alga Dictoyota dichotoma
  6. Three new cembranoid-type diterpenes from Red Sea soft coral Sarcophyton glaucum: Isolation and antiproliferative activity against HepG2 cells
  7. Bioactive C15 acetogenins from the red alga Laurencia obtusa
  8. Insecticidal Metabolites from the Green Alga Caulerpa racemosa
  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. 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. Caulerpine: An antitumor indole alkaloid from Caulerpa racemosa
  16. A review of steroids from Sarcophyton species
  17. Jaceidin Flavonoid Isolated from Chiliadenus montanus Attenuates Tumor Progression in Mice via VEGF Inhibition: In Vivo and In Silico Studies
  18. Toward Computing Relative Configurations: 16-e pi-Latrunculin B, a New Stereoisomer of the Actin Polymerization Inhibitor Latrunculin B
  19. Cytotoxic neviotane triterpene-type from the red sea sponge Siphonochalina siphonella
  20. Novel nano silica assisted synthesis of azo pyrazole for the sustainable dyeing and antimicrobial finishing of cotton fabrics in supercritical carbon dioxide
  21. Selective cytotoxic effects on human breast carcinoma of new methoxylated flavonoids from Euryops arabicus grown in Saudi Arabia
  22. Evaluation of the brown alga, Sargassum muticum extract as an antimicrobial and feeding additives
  23. Novel synthesis of reactive disperse dyes for dyeing and antibacterial finishing of cotton fabric under scCO2
  24. New antimicrobial biscembrane hydrocarbon and cembranoid diterpenes from the soft coral Sarcophyton trocheliophorum
  25. Cytotoxic effects of three new metabolites from Red Sea marine sponge, Petrosia sp.
  26. New Cytotoxic Laurene‐, Cuparene‐, and Laurokamurene‐Type Sesquiterpenes from the Red Alga Laurencia obtusa
  27. Antibacterial sphingolipid and steroids from the black coral Antipathes dichotoma
  28. A new cytotoxic stigmastane steroid from Pistia stratiotes.
  29. Two new polyacetylene derivatives from the Red Sea sponge Xestospongia sp.
  30. Cytotoxic scalarane-type sesterterpenes from the Saudi Red Sea sponge Hyrtios erectus
  31. A sesquiterpene glucoside from Reichardia tingitana
  32. New Antifungal Cholestane and Aldehyde Derivatives from the Red Alga Laurencia papillosa
  33. New cytotoxic indole-type alkaloids obtained from Rhazya stricta leaves
  34. Potent antifouling metabolites from Red Sea organisms
  35. A new cytotoxic brominated acetylenic hydrocarbon from the marine sponge Haliclona sp. with a selective effect against human breast cancer
  36. Cytotoxic polyacetylenes from the Red Sea sponge Siphonochalina siphonella
  37. Isolation, antimicrobial and antitumor activities of a new polyhydroxysteroid and a new diterpenoid from the soft coral Xenia umbellata
  38. Two new terpenoidal derivatives: a himachalene-type sesquiterpene and 13,14-secosteroid from the soft coral Litophyton arboreum
  39. A sesquiterpene ether from Laurencia obtusa
  40. Cytotoxic bicyclic diterpene from the brown alga Sargassum crispum.
  41. Cytotoxic metabolites from Callyspongia siphonella display antiproliferative activity by inducing apoptosis in HCT-116 cells
  42. Antiproliferative effects of triterpenoidal derivatives, obtained from the marine sponge Siphonochalina sp., on human hepatic and colorectal cancer cells
  43. Acyclic diterpenoid from the red alga Gracilaria foliifera
  44. New cytotoxic cyclic peroxide acids from Plakortis sp. marine sponge
  45. Vincamine and 14-epi-vincamine indole alkaloids from Ambelania occidentalis
  46. Multi-target directed ligands inspired natural products as an effective approach for the treatment of complex chronic health disorders
  47. Polymorphisms of interleukin 4 and interleukin 4 receptor genes and bronchial asthma risk among Egyptian children
  48. Marine Bioactive Steryl Esters from the Red Sea Black Coral Antipathes dichotoma
  49. Antigenotoxic ketosteroid from the red algae Jania adhaerens
  50. Bio-active sesquiterpenoids and norsesquiternoids from the Red Sea octocoral Rhytisma fulvum fulvum
  51. 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�…
  52. New nimbolinin and meliacarpin derivatives from Melia azedarach.
  53. Differential cytotoxic activity of the petroleum ether extract and its furanosesquiterpenoid constituents from Commiphora molmol resin
  54. 3β, 7β-Dihydroxy-5α-cholestan-11-one: A new oxidation pattern of cholestane skeleton from Laurencia papillosa
  55. New Diarylheptanoids and a Hydroxylated Ottelione from Ottelia alismoides
  56. Isolation and structure determination of the biologically active sphingolipids from marine sponge Haliclona species
  57. Selective anti-proliferative activity of indole alkaloids from Rhazya stricta Decne leaves
  58. Two New Cytotoxic C-29 Steroids from the Red Sea Brown Alga Cystoseira trinodis
  59. Lactones from Pituranthos tortusus
  60. A Novel Synthesis of Imidazo (4, 5‐d) azepine Ring System.
  61. Cytotoxic evaluation of new polyhydroxylated steroids from the Red Sea soft coral Litophyton mollis (Macfadyen, 1936)
  62. Anti-inflammatory, antioxidant, cytotoxic activities, and sesquiterpenoid contents of Paralemnalia thyrsoides
  63. 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�…
  64. New Cytotoxic Monoalkyl Glycerol Ether from the Red Sea Soft Coral Nephthea mollis
  65. Synthesis and biological assessment of new benzothiazolopyridine and benzothiazolyl-triazole derivatives as antioxidant and antibacterial agents
  66. Gene Expression Profiling to Delineate the Anticancer Potential of a New Alkaloid Isopicrinine From Rhazya stricta
  67. Humulene sesquiterpene lactones from Asteriscus schimperi
  68. Phytochemical composition of Cuminum cyminum and its biological activity
  69. Cytotoxic ceramides from Antipathes dichotoma
  70. New Bioactive Eudesmane‐type Sesquiterpenoids From the Red Sea Soft Coral Nephthea sp.
  71. Unveiling the potential of novel natural product-based MTDLs that integrate cinnamamide scaffold as multifunctional agents for the treatment of Alzheimer's disease
  72. Cytotoxic and anti-bacterial evaluation of two new aromatic A-ring steroids isolated from the Red Sea soft coral Dendronephthya spp.
  73. Photooxygenation reactions of natural piperine
  74. 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
  75. Insecticidal and phytochemical investigation of Catharanthus roseus L. extracts to Spodoptera littoralis (Boisd.)
  76. Two New Bioactive Metabolites from Xestospongia sp. with Antimicrobial and Anticancer Activities
  77. Chemical investigation and isolation of some constituents from Paralemnalia thyrsoides
  78. Cytotoxic Isoprenoids from the Red Sea Soft Corals Sarcophyton glaucum and Xenia umbellate
  79. 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
  80. Synthetic approaches to some new sulfur-containing heterocycles of anticipated immunosuppressive activity
  81. Sesquiterpenoids with antibacterial and cytotoxic activities from the soft coral Litophyton arboreum
  82. New bioactive mono-acyl glycerol ester from the Red Sea marine coral Sclerophytum levi
  83. Constituents of Onopordon alexandrinum
  84. Sesquiterpenoids From the Red Sea Soft Coral Lemnalia sp.: Isolation, Structural Elucidation, and Cytotoxic Evaluation
  85. Novel Purine‐Based Natural Products as Inhibitors of Cholinesterases and Monoamine Oxidases Presenting Potential Multitarget Therapeutics Tackling Alzheimer's Disease
  86. Avalia��o da alga marrom, extrato de Sargassum muticum, como antimicrobiano e aditivo alimentar
  87. The Dual Therapeutic Potential of Ottelione A on Carbon Tetrachloride-induced Hepatic Toxicity in Mice
  88. Assessment of toxicological effects of some new plant extracts on cotton aphid, Aphis gossypii
  89. 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
  90. Impact of Ottelione on Gamma-glutamyl transferase and Hematological markers in mice with Liver Fibrosis
  91. Pharmaceutical composition for treating cancer and a method thereof
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  93. Erratum: Bioactive C15 Acetogenins from the Red Alga Laurencia obtusa
  94. ALEKSEEV, EV 013 014 ALEMAN, J. 107 ALMENDROS, P. 167 ALVAREZ DE CIENFUEGOS, L. 046
  95. Molluscicidal activity and chemical constituents of Erythrina ulei against Monacha cartusiana.
  96. " Nonet-bracketing" in the H-1 NMR spectrum: Quantification of low levels of water and other solutes in organic solutions.
  97. Sensitivity of human breast carcinoma cells to ottelione a and its analogues.
  98. 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
  99. New antitumor agents: Structure and synthesis studies
  100. Reactions on activated nitrites: routes for synthesis of some new fused heterocycles containing-nitrogen
  101. 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
  102. Reaction of 1, 3-dicarbonyl Compounds with Nitriles: Synthesis of Pyrazolo [1, 5-c]-1, 2, 4-triazines, Pyridines, 4H-pyrans and 4H-indeno [1, 2-I] pyran Derivatives
  103. Epoxidation of the natural β-snyderol to potential alkylating agents of DNA
  104. Phytochemical study of the red alga Laurencia obtusa grown in Egypt
  105. Application of Activated Awiss Mango biosorbent for Dye Industrial Wastewater Treatment
  106. The removal mechanism for methylene blue dye onto mango biosorbents
  107. NEW NIMBOLININ AND MELIACARPIN DERIVATIVES FROM Melia
  108. Ring Expansion of Carbocyclic �-Keto-ester with Acetylenic Esters
  109. MOLLUSCICIDAL ACTIVITY AND CHEMICAL CONSTITUENTS OF