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Antimicrobial activities of three seaweeds extract against some human viral and bacterial pathogens

BIOCELL 2022年第1期46卷 247-261页

作者： JELAN MOFEED mohamed deyab ABDELNASER mohamed MAHMOUD MOUSTAFA SALLY NEGM EMAD EL-BILAWY Faculty of Science King Salman International UniversitySinaiEgypt Faculty of Fish Resources Suez UniversitySuezEgypt Faculty of Science Damietta UniversityDamiettaEgypt Department of Biology College of ScienceKing Khalid UniversityAbha9004Saudi Arabia Department of Botany and Microbiology Faculty of ScienceSouth Valley UniversityQenaEgypt Life Sciences Department Faculty of Science and ArtKing Khalid UniversityMahayel Aseer 61421Saudi Arabia Unit of Food Bacteriology Central Laboratory of Food HygieneMinistry of HealthSharkia44516Egypt

Microbial infections cause complicated health influences along with bad economic *** the present investigation,three dominant seaweeds namely,Amphiroa anceps,Corallina officinalis and Sargassum filipendula were collected from different Egyptian sites at the Red Sea and Mediterranean Sea during autumn *** extracts of the three algae were screened for their antibacterial activity against three pathogenic bacteria Salmonella typhiimurium,Staphylococcus aureus and Escherichia coli,in addition to in vitro antiviral activity against Rotavirus(RV),and Coxsackie virus B3(CVB3)that cause severe diseases in *** extract of ***,*** and *** inhibit *** cells by 57.1%,85.7%,and 91.4%,*** highest level of concentration of the *** extract(100μg/mL)inhibits 100%of Staphylococcus aureus cells followed by *** and *** extract which inhibit 82.5%and 75%of ***,the highest concentration of *** extract inhibits *** by 80%.The extract of *** exhibited a high antiviral effect against RV infection with TI=22 and virus titers lessened by 2.75 log TCID_(50) followed by extractions of *** with TI=18.3 and virus titers reduced by 2.5 log TCID_(50).Against CVB3 infection,the extract of *** causes the highest antiviral activity with TI=15 and reduce the viral titers by 2.5 log TCID_(50),followed by extractions of *** with TI=8.8 and inhibition of virus titers by 1.75 log TCID_(50).Extract of *** displayed the lowest antiviral effects against RV and CVB3 infection with TI=2.4 and 1.4,*** obtained results clarified that the extract of three marine seaweeds maintains a potent antimicrobial activity,making them a future promising source of new antimicrobial drugs.

关键词： Seaweeds Antimicrobial Antibacterial Cytotoxicity Antiviral

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Ecological and biochemical analyses of the brown alga Turbinaria ornata(Turner)*** from Red Sea coast,Egypt

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Journal of Coastal Life Medicine 2016年第3期4卷 187-192页

作者： mohamed Ali deyab Fatma mohamed Elnabawy Ward Department of Botany Faculty of ScienceDamietta UniversityDamiettaEgypt

Objective:To study ecological parameters and biochemical composition of brown seaweed,Turbinaria ornata(***)collected from Hurghada shores,Red Sea coast of Egypt during September,October and November,***:*** and its associated seaweeds were collected,identified and their abundances were *** of collection site was analyzed physicochemically as well as qualitative and quantitative analyses of *** was analyzed for protein,total carbohydrate,lipids,alginic acid,agar,pigments,minerals and heavy ***:The results showed that macroalgal species recorded along Hurghada shores belong to Phaeophyta,Rhodophyta and *** collection site,the moderate temperature,slight alkaline pH,low turbidity,high dissolved oxygen and valuable nutrient content of saline water exerted the massive growth of *** with maximum abundance(24%)during *** phytoplankton community was quite diverse with a maximum numbers of taxa(104.2×10^(8) cell/L)recorded during *** of *** alga powder showed that high soluble carbohydrate(2.80±0.10 mg/g dry/weight)and chlorophyll c(0.0017±0.0001 mg/g fresh weight)contents were recorded during September;while high contents of protein(37.70±0.60 mg/g dry weight),lipids(3.10±0.06 mg/g dry weight),polysaccharides(agar and alginates),carotenoids(0.0160±0.0004 mg/g fresh weight),minerals and heavy metals were recorded during ***:The study revealed that physicochemical analyses of water were varied slightly during the three months and suitable for the growth of *** contains high amount of most biochemical constituents during October.

关键词： Turbinaria ornata Heavy metals Macroalgae Phaeophyta Phytochemical composition Red Sea

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Algal massive growth in relation to water quality and salinity at Damietta,north of Egypt

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Journal of Coastal Life Medicine 2015年第2期 113-121页

作者： mohamed Ali Ibraheem deyab Taha mohamed El-Katony Botany Department Faculty of ScienceDamietta UniversityNew Damietta CityEgypt

Objective:To relate the proliferation and dominance of certain algal species at the Damietta and its relation to water ***:Water and algal biomass were bimonthly sampled from five selected sites at Damietta Province,Egypt during *** were identified and ***,algae and sediment were ***:The physicochemical properties of water showed limited seasonal but substantial local *** high levels of nitrogen and phosphorus and turbidity of water pointed to marked eutrophication,which could enhance massive algal *** temporal fluctuation in temperature,exposure to industrial and domestic sewage and salinity results in succession between blooming algal *** platensis and Chlorella vulgaris alternated in a moderately saline water and Oscillatoria agardhii and Mougeotia scalaris in a fresh water body during summer and winter ***,Microcystis aureginosa and Ulva lactuca alternated in a moderately saline site during autumn and summer *** albida dominated a fish pond of brackish water and Dunaliella salina dominated the most saline water over the whole period of ***:Growth of the predominant algal species is correlated to water *** species are of considerable nutritive value,with moderate contents of protein,carbohydrate,macronutrients and micronutrients,which evaluates them for usage as food(green and macroalgae),fodder or bio-fertilizer(cyanophytes).

关键词： Algal growth Water quality Sediment North Damietta Egypt Waste water treatment Algal succession

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Evaluation of antibacterial activity of the brown Seaweed Turbinaria ornata(Turner)*** from Egypt

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Journal of Coastal Life Medicine 2016年第8期4卷 603-607页

作者： Fatma mohamed Elnabawy Ward mohamed Ali deyab Botany and Microbiology Department Faculty of ScienceDamietta UniversityDamiettaEgypt

Objective:To investigate the potential antibacterial activities of ethanol extracts of Turbinaria ornata(***),Oleic acid(OA)and palmitic acid(PA)extracted from *** as well as mixtures of OA and PA(1:1)against some bacterial ***:Brown seaweed *** was collected from Hurghada shores,Red Sea coast of *** and PA were extracted from *** extracts of ***,OA,PA and mixtures of these two fatty acids(1:1)were tested for their antibacterial activities against Escherichia coli,Bacillus cereus,Bacillus subtilis,Klebsiella pneumonia and Staphylococcus aureus by the disc diffusion ***:Ethanol extracts of ***,OA,PA and mixtures of OA and PA(1:1)showed antibacterial activities that increased significantly(least significant difference at 0.05 level)with increasing concentrations against all tested *** concentrations of ethanol extracts of *** and extracted OA showed its highest activity against Bacillus subtilis,while PA and mixtures of PA and OA(1:1)showed its highest activity against Bacillus *** maximum inhibition activities were shown for mixtures of OA and PA(1:1).Scanning electron microscope showed that mixtures of OA and PA(1:1)caused plasmolysis and reduction in cell size of Escherichia ***:Different concentrations of *** and its fatty acids showed activities against all tested ***,it is a potential source of natural antimicrobial compounds.

关键词： Turbinaria ornata Bacteria Seaweeds Disc diffusion method Fatty acids Phaeophyta

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Temporal variation in chemical composition of Dictyota dichotoma (Hudson) J.V. Lamouroux (Dictyotales,Phaeophyceae) from Red Sea Coast, Egypt

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Journal of Coastal Life Medicine 2017年第4期5卷 149-155页

作者： mohamed Ali deyab Taha mohamed El-Katony Magda Faiz El-Adl Fatma mohamed Ward Department of Botany and Microbiology Faculty of ScienceDamietta UniversityNew DamiettaEgypt

Objective: To relate the chemical composition of Dictyota dichotoma (Hudson) *** (D. dichotoma) to variation of water characteristics at Hurghada, ***: Sea water and D. dichotoma fronds were collected from Hurghada shores, during autumn of 2014. Water samples were analyzed and fronds of D. dichotoma were biochemically ***: Sea water was characterized with high levels of salinity, P and heavy metals but with low content of nitrogen. The confined nature and the high evaporation of the Red sea contribute to the high salinity while the mining and transportation of phosphatic ore in the nearby region contribute to the high load of P and heavy metals. With the progress of season from September to November, water temperature was markedly reduced whereas pH and ionic content of water was reduced to a lesser extent, with marked alteration in ionic composition. With the progress of season towards winter, there was marked reduction in mineral composition of the fronds, shift in frond composition in favor of carbohydrates at the expense of proteins, lipids and alginates;and shift in the pigment composition in favor of chlorophylls at the expense of carotenoids and ***: These facts point to active growth and photosynthetic activity during the cold period;that is, D. dichotoma is a cold water alga. D. dichotoma had moderate nutritive value, with moderate contents of carbohydrates, proteins, lipids and minerals. The mineral accumulation capacity of the fronds was more evident for N, P and K than for Ca, Mg and heavy metals.

关键词： Alginates Minerals Pigments Red sea

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Preparation of composite tubular grafts for vascular repair via electrospinning

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Progress in Natural Science:Materials International 2012年第2期22卷 108-114页

作者： Salem S.Al-deyab mohamed El-Newehy Petrochemical Research Chair Department of ChemistryCollege of ScienceKing Saud UniversityRiyadh 11451Saudi Arabia Department of Chemistry Faculty of ScienceTanta UniversityTanta 31527Egypt

A novel type of composite vascular graft was developed via electrospinning in the present *** and chitosan were blended to form the inner and outer ***(l-lactide-co-caprolactone)(P(LLA-CL))was selected as a material for the middle layer of composite vascular *** morphology and diameter of the composite grafts were studied by Scanning Electron Microscope(SEM).The results of mechanical tests showed that the composite scaffolds provided the whole grafts with better strength and flexibility compared with blended grafts,mainly due to the fact that the middle layer was P(LLA-CL).Cell viability studies with endothelial cells suggested a prompt adhesion and proliferation duo to the fact that the outer layer was collagen and *** microscopy demonstrated that a monolayer of endothelial cells could be formed after 7 days of *** above results indicated that the composite fibrous scaffolds could be a good candidate for blood vessel repair by electrospinning method.

关键词： Electrospinning Composite Vascular graft Endothelial cell Nanofiber

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Hierarchical TiO_2/ZnO Nanostructure as Novel Non-precious Electrocatalyst for Ethanol Electrooxidation

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Journal of Materials Science & Technology 2015年第1期31卷 97-105页

作者： Gehan M.K.Tolba Nasser A.M.Barakat A.M.Bastaweesy E.A.Ashour Wael Abdelmoez mohamed H.El-Newehy Salem S.Al-deyab Hak Yong Kim Organic Materials and Fiber Engineering Department Chonbuk National University Chemical Engineering Department Faculty of EngineeringMinia University BioNanosystem Department Chonbuk National University Department of Chemistry College of ScienceKing Saud University

Metal oxides have a higher chemical stability in comparison to metals,so they can be utilized as electrocatalysts if the activity could be *** the composition,the morphology of the nanostructures has a considerable impact on the electrocatalytic *** this work,zinc oxide nano branches-attached titanium dioxide nanofibers were investigated as an economic and stable catalyst for ethanol electrooxidation in the alkaline *** introduced material has been synthesized by electrospinning process followed by hydrothermal ***,electrospinning of colloidal solution consisting of titanium isopropoxide,poly（vinyl acetate） and zinc nanoparticles was performed to produce nanofibers embedding solid *** order to produce TiO2nanofibers containing ZnO nanoparticles,the obtained electrospun nanofiber mats were calcined in air at 600 °*** formed ZnO nanoparticles were exploited as seeds to outgrow ZnO branches around the TiO2nanofibers using the hydrothermal technique at sub-critical water conditions in the presence of zinc nitrate and bis-hexamethylene *** morphology of the final product,as well as the electrochemical measurements indicated that zinc nanoparticles content in the original electrospun nanofibers has a significant influence on the electrocatalytic activity as the best performance was observed with the nanofibers synthesized from electrospun solution containing 0.1 g Zn,and the corresponding current density was 37 mA/***,this study paves a way to titanium dioxide to be exploited to synthesize effective and stable metal oxide-based electrocatalysts.

关键词： Direct ethanol fuel cells Electrospinning Nanofibe

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