Gehan Ismail

Tanta University Faculty of Science, University of Tanta, Egypt

The surge in global utilization of petroleum-based plastics, which notably heightened during the COVID-19 pandemic, has substantially increased its harm to ecosystems. Considering the escalating environmental impact, a pivotal shift towards bioplastics usage is imperative. Exploring and implementing bioplastics as a viable alternative could mitigat...

Phlorotannins are a unique and diverse category of secondary polyphenolic metabolites biosynthesized by brown seaweeds. They have revealed a huge potential for food and medicinal applications. In this study, five brown seaweed species were investigated: Polycladia myrica, Sirophysalis trinodis, Dictyota spiralis, Sargassum euryphyllum, and Turbinar...

Taking into consideration, the challenges faced by the environment and agro-ecosystem make increased for suggestions more reliable methods to help increase food security and deal with difficult environmental problems. Environmental factors play a critical role in the growth, development, and productivity of crop plants. Unfavorable changes in these...

Climatic changes are anticipated to have a detrimental effect on calcifying marine species. Calcareous red algae may be especially vulnerable to seasonal variations since they are common and essential biologically, but there is little research on the morpho-anatomical, and chemical characterization of such species. This study conducted the seasonal...

Editorial on the Research Topic Algal biotechnology: Current trends and nanotechnology prospective Algae biotechnology is an ever-expanding field of research that aims to use the biological properties of algae to develop products and solutions for diverse sectors, from food and energy to medicines and cosmetics. Algae are considered highly versatil...

Currently, algae arouse a growing interest in the pharmaceutical and cosmetic area due to the fact that they have a great diversity of bioactive compounds with the potential for pharmacological and nutraceutical applications. Due to lifestyle modifications brought on by rapid urbanization, diabetes mellitus, a metabolic illness, is the third larges...

Currently, algae arouse a growing interest in the pharmaceutical and cosmetic area due to the fact that they have a great diversity of bioactive compounds with the potential for pharmacological, cosmetic, and nutraceutical applications. Many of these bioactive compounds are secondary metabolites whose amounts in the algae vary with varying environm...

Cyanobacteria like Arthrospira platensis and Nostoc muscorum are known to be beneficial for plant development. They can improve plant growth, yield, proximate content (protein and carbohydrate), and stimulate plant tolerance to abiotic stresses like herbicides. In the present study, the impacts of brominal herbicide (Bh) alone or in combination wit...

Background: Numerous pesticides and herbicides used in excess cause oxidative stress in plants. These chemicals protect plants from weeds and pests, but they also have very negative side effects, making them common abiotic stressors. One of the most significant nutritional crops in the world is the wheat plant. Conditions of herbicide stress have...

Brown seaweeds are known natural antioxidants and antiviral candidates. This study aimed to extract and characterize polysaccharides from Sargassum euryphyllum and Sargassum aquifolium brown macroalgal species and investigate their antiviral potential against avian infectious bronchitis virus (IBV). The chemical composition of the polysaccharides w...

IN THIS study, silver nanoparticles (AgNPs) were synthesized using biological and chemical methods. Trisodium citrate (TSC) was used as a reducing and stabilizing agent in the chemical method. While three seaweed aqueous extracts from Enteromorpha intestinalis, Sargassum vulgare, and Asparagopsis taxiformis and two cyanobacteria filtrates from Spir...

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...

Biosynthesis of titanium dioxide nanoparticles (TiO2NPs) by Sphingomonas paucimobilis B34 bacteria was successfully achieved and followed by UV-Vis spectroscopy. The nanoparticles were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM) and fourier transform infrared spectroscopy (FTIR) techniques. The biosynthesized Ti...

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...

This study investigated the effect of Ulva fasciata and Sargassum lacerifolium seaweeds as heavy metal remediators for soil and on the growth of radish (Raphanus sativus L.). The soil was inoculated by dry biomass of each seaweed alone and by their mixture. Seaweeds inoculation increased the organic matter content, clay-size fraction, and nutrients...

The ethyl acetate, n hexane and methanol extracts of six cyanobacterial species isolated from paddy fields in Egypt were assessed for their antimicrobial activity, using disc diffusion method. Oscillatoria acuminata, Oscillatoria amphigranulata and Spirulina platensis methanolic extracts showed the highest inhibition zones. Minimum inhibitory conce...

In this study, biosynthesis of silver nanoparticles (AgNPs) using two species of cyanobacteria, Anabaena variabilis (Kütz) and Spirulina platensis (Gomont) was investigated and evaluated for dye removing capacity. The formation of AgNPs was detected by the change in colour using UV-Vis spectroscopy and further characterised by X-ray diffraction (XR...

Brown algae earned importance by virtue of their promising secondary metabolites of reasonable biological activities. Herein, the antioxidant, antimicrobial, and anticancer effects of crude extracts obtained from two Egyptian brown seaweeds, Sargassum linearifolium and Cystoseira crinita were evaluated. Phytochemical and GC-MS analyses revealed num...

In this study, five macroalgae and four microalgae in addition to seven Cyanophycean, blue-green algae, were isolated from different environmental habitats. The ability of these species for bioethanol and biodiesel production was assessed. Five techniques were examined for cell wall disruption, namely thermic shock, manual grinding, acid, base, and...

In this study crude extracts of Turbinaria decurrens, Padina pavonica, Sargassum muticum and Sargassum acinarium (Phaeophyta); Ulva lactuca (Chlorophyta) and Pterocladia capillacea (Rhodophyta) seaweeds were tested to evaluate their antioxidant properties and antidiabetic potential on α-amylase and α-glucosidase starch hydrolyzing enzymes. The resu...

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 study aimed to evaluate the energy recovery through biodiesel and bioethanol production from Scenedesmus obliquus in a sequential route of lipid extraction followed by fermentation, with recycling of waste glycerol (WG) as a nutrient supplement into the culture. Low WG concentrations significantly enhanced the cellular dry weight over t...

Objectives To investigate the biosynthesis of silver nanoparticles (AgNPs) using extracts of some bacterial isolates Bacillus pumilus, Bacillus paralicheniformis and Sphingomonas paucimobilis. The formation of AgNPs was detected by the change in color into yellow and confirmed by the UV–Vis spectroscopy. The nanoparticles were characterized by X-ra...

CYANOBACTERIA are a diverse group of prokaryotes which occupies many environments. In terrestrial habitats, they were famed to benefit both soil and plants through releasing bioactive substances of various biological functions. In the present study four treatments of Anabaena variabilis (seeds primed in 1% fresh cyanobacterial extract, seeds sown i...

Cost-efficient harvesting of microalgae is a major challenge for large-scale biomass production. The present study aimed to optimize and model the flocculation process for efficient harvest of the biodiesel promising green microalga Scenedesmus obliquus grown in municipal wastewater. In addition, the influence of applied flocculation on biodiesel r...

The present study investigated the biochemical composition of three seaweeds; Ulva fasciata (Chlorophyta), Sargassum linifolium (Phaeophyta) and Corallina officinalis (Rhodophyta). Total chlorophyll content was maximum in U. fasciata (34.06mg/g dry wt.) while carotenoid content was the highest in C. officinalis (3.8 mg/g dry wt.). The uppermost lev...

Concentrations of nine heavy metals (Cd, Co, Cr, Cu, Fe, Mn, Ni, Pb, and Zn) were determined in the green seaweed species Cladophora glomerata and Ulva compressa collected from El-Mex and Sidi Kirayr locations. The heavy metal concentrations in algal tissues were in direct correlation with their soluble concentrations in seawater with the descendin...

Season al v ariation of the a ntibacteri al a ctiv ity of some sea wee ds against multi drug resi stant patho genic bacterial strai ns ABSTRACT: The present s tud y aimed t o eval uat e the eff ect of seas onal v ariation of the antibact erial ac tivit y of s ome s eaw eed s. Pat hogenic bact erial is olates wer e c ollec ted from adult p atients o...

Biological or green synthesis of nanoparticles is a relatively new emerging field of nanotechnology which are cheaper, less-labor and eco-friendly benefits over chemical and physical processes of synthesis. In the present work, three different seaweeds species (Caulerpa prolifera, Sargassum acinarium and Gigartinia teedi) aqueous extracts were comp...