Saly Gheda

Tanta University · Department of Botany

This study aimed to biosynthesize zinc oxide nanoparticles (ZnO-NPs) using extracts from various seaweeds, including Ulva lactuca, Ulva intestinalis (Chlorophyta), and Sargassum muticum (Phaeophyceae). The biosynthesized ZnO-NPs were characterized using UV spectroscopy, Fourier transform infrared spectroscopy, X-ray diffraction, transmission electr...

Microalgae have the potential as a source of biofuels due to their high biomass productivity and ability to grow in a wide range of conditions, including wastewater. This study investigated cultivating two microalgae species, Oocystis pusilla and Chlorococcus infusionum , in wastewater for biodiesel production. Compared to Kühl medium, KC medium re...

Upon Seeking natural and safe alternatives for synthetic medicines to treat many chronic diseases, seaweeds have offered a promising resource to produce numerous bioactive secondary metabolites. Through in vivo investigations, Turbinaria decurrens acetone extract (AE) revealed its anti-diabetic activity against alloxan-induced diabetic rats. Treatm...

The present work was designed for the biosynthesis of silver nanoparticles (AgNPs) by Spirulina platensis and Nostoc linckia phycobiliprotein extract and for evaluation of their antimicrobial, antioxidant, and antiviral activities. The biosynthesized AgNPs were characterized by UV-Vis spectroscopy, Fourier transform-infrared spectroscopy, transmiss...

The study evaluated different extracts of Spirulina platensis using acetone, methanol, ethanol as well as water solvents for their antioxidant and antidiabetic potential. The results showed that all S. platensis extracts exhibited antioxidant activity by using DPPH (2, 2-Diphenyl-1-picrylhydrazyl), reducing power and total antioxidant capacity assa...

Microalgae are rich sources of structurally novel and biologically active metabolites. Primary and secondary metabolites produced by these organisms which have drawn interest of the pharmaceutical industries. In this regard, the study aimed to screening of phytochemical compounds and evaluate the total phenolic content and the antioxidant activity...

In this study different crude extracts of two microalgae Spirulina platensis (Cyanobacteria), Chlorella vulgaris (Chlorophyta) and six different seaweeds vis Turbinaria decurrens, Padina pavonica, Sargassum muticum and Sargassum acinarium (Phaeophyta); Ulva lactuca (Chlorophyta) as well as Pterocladia capillacea (Rhodophyta) were tested to evaluate...

The present work investigated the potential of the green alga Chlorella vulgaris to produce high-quality biofuel under culture stress conditions. The cultivation was carried out in a 1000 l open plate tank system, which provides biomass yields comparable to open pond systems, but with less area needed. Algal biomass and lipid content were measured...

Objective: To evaluate the potential role of the polysaccharides of the marine algae as an anticancer agent in vitro against colon cancer cell line (CoCa2) and breast cancer (MCF7) cell lines and to measure lactate dehydrogenase enzyme (LDH) activity as biomarker of membrane integrity of the cells. Methods: The cells of breast cancer (MCF7) and col...

Hepatitis C virus (HCV) has infected 3% of the population worldwide and 20% of the population in Egypt. HCV infection can lead to hepatocellular carcinoma and death. The presently available treatment with interferon plus ribavirin, has limited benefits due to adverse side effects. Seaweeds have become a major source of new compounds to treat viral...

Microalgae have efficient nutritional influence to obtain high survival growth and quality of fish larvae and to promote the growth of brine shrimp. In this work the Plackett–Burman statistical design was applied to specify which nutrient factor(s) optimize the nutritional contents [protein, carbohydrate, β-carotene, ascorbic acid and free radical...

This study aims to assess the bioactive compounds and antioxidant activities of three selected seaweeds [Cladophora pellucida (Chlorophyta), Padina tetrastromatica (Phaeophyta) and Laurencia papillosa (Rhodophyta)] collected from Abo Qir bay, Alexandria, Egypt. L. papillosa demonstrated the greatest DPPH radical scavenging activity (52.1 ± 1.23 %)...

Many soils in Egypt have low nutrient content and poor structural stability. Herein, we have investigated the effects of inoculation of two nitrogen fixing cyanobacterial species (Nostoc kihlmani and Anabaena cylindrica), each alone and as a mixture on the chemical, physical and microstructure properties of the degraded soil, and on wheat growth 2...

Impetigo is a highly infectious superficial bacterial disease, most common among pre-school children. Applying 11 antimicrobial agents to the Staphylococcus aureus, the most causative organism for impetigo, S. aureus isolates are resistant to all agents except of vancomycin and fusidic acid. Nevertheless, treatment of impetigo using antimicrobial a...

Polysaccharides present in several seaweeds (Kappaphycus alvarezii, Calliblepharis jubata, and Chondrus crispus—Gigartinales, Rhodophyta; Gelidium corneum and Pterocladiella capillacea—Gelidiales, Rhodophyta; Laurencia obtusa—Ceramiales, Rhodophyta; Himanthalia elongata, Undaria pinnatifida, Saccorhiza polyschides, Sargassum vulgare, and Padina pav...

Two cyanobacterial species (Nostoc entophytum and Oscillatoria angustissima) were tested as biofertilizers, substituting the normally used chemical fertilizer, for pea plant. Inoculation of soil with a suspension of each species or a combination of the two species significantly increased the germination percentage and stimulated the other measured...

The aqueous extracts of Ulva lactuca and Chlorella kessleri increased the percentage of germination, all seedling growth parameters, leaf area, pigments content and the fresh and dry weights of roots and shoots of Vivia faba compared to the controls. The two algal extracts also increased concentrations of inorganic elements and bound nitrogen conte...