Ahmed Darwish El-Gamal

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• PhD.prof.Phycology
• Professor at Al-Azhar University

Twenty three aerophytic blue-green algal species were isolated and identified from 5 districts in Cairo, namely: Nasr City, Abassiya, Downtown, Maadi and Tebbin. Downtown contained the highest numbers of total algal species (13 species) during the study throughout the years 2004-2005 in comparison to other districts. The composition of aeroalgal ta...

The electrophoretic studies were carried out on three selected algal species, namely Chrococcus dispersus, Microcystis flos-aquae and Microcoleus steenstruqii exposed to two different concentrations (low = 0.5& high = 2 ppm) of cadmium. Protein profile analyzed by SDS PAGE gel electrophoresis showed differential expression of several proteins. Cons...

In this study, soil samples were collected from ten different regions comprising the main ten cities of Kafr El-Sheikh Governorate during 2002. The Physico-chemical characteristics of the soil were investigated. The results showed remarkable differences among various sites. Twenty six genera including 40 species of algae were isolated and identifie...

A new species of Seminavis is described from the brackish waters of the estuary of the Damietta Branch of the River Nile (Egypt) on the basis of light and scanning electron microscopy. Morphologically, it shares some diagnostic features with S. insignis, S. robusta, and S. ventricosa. Its main differentiating characters are the ventral central stri...

Regardless biodiesel is represented in the form of oil from grains, agricultural crops or microorganisms, it is a clean fuel depends mainly on biomass conversion. The present work indicates that the green microalga Scenedesmus obliquus showed higher biomass productivity of 0.15 g (CDW) L −1 d −1. The increase in NaCl concentration up to +100% cause...

Current agricultural production relies heavily on synthetic pesticides, which can damage human beings and the environment. To maintain the availability of food for the world's rapidly expanding population, more environmentally friendly alternatives to chemical pesticides need to be developed. Microalgae contain several antimicrobial chemicals and a...

The green microalga Chlamydomonas reinhardtii was utilized for bio-based plastic production, focusing on optimizing polyhydroxybutyrate (PHB) synthesis. Optimal cultivation conditions (40 °C, pH 8.8, light intensity 1100 lux, salinity 0.15 M) yielded 102.84 ± 0.5 mg/g of PHB, while phosphorus-free media with 2 g/L sodium acetate achieved a maximum...

Bioplastics are increasingly being recognized as a viable substitute for conventional plastics across a broad spectrum of applications. Microalgae, such as Spirulina platensis (Geitler) and Haematococcus pluvialis (Flotow), are emerging as sustainable sources for bioplastic production, aligning with the principles of a circular bioeconomy. This stu...

This study evaluated the biochemical composition and bioactivity of the crude extract of Sargassum dentifolium on the western coast of the Red Sea, Hurghada, Egypt. The biomass contained approximately 25.80% of total carbohydrates, and 8.40% of total protein, while lipids constitute about 2% of the total dry weight which is consistent with the low...

Cyanobacterial metabolites have gained a great attention during the last few decades, as they are a potential source for bioactive compounds. In the present study the total phenolic and flavonoid compounds in the biomass of Leptolyngbya sp. Q1 (MZ504747) and Desertifilum sp. Q2 (MZ504748) were estimated and their methanolic extracts were screen...

Characterization of Cyanobacteria in lakes with different physicochemical properties provides insights into the diversity of this phylum and knowledge of their features that are relevant to biotechnology applications. Six Cyanobacterial isolates were recovered from freshwater Lake Nasser and saline Lake Qarun, Egypt. The isolates were identified ba...

Single-cell proteins have a potential source for partial replacement of protein and lipids in animal feed. Also, using microorganisms in fish feed enhanced feed efficiency, growth performance, and disease resistance. The purpose of this study is to see if combining several microorganisms (Azotobacter chroococcum, Chlamydomonas reinhardtii, and bake...

Protein and fatty acid deficiency in human nutrition is a major concern for developing countries. The filamentous blue-green microalga Spirulina platensis is one of the best algal species that can be used as a food supplement. This study aims to optimize biomass, the total protein, and the fatty acid content of Spirulina platensis. Statistics optim...

Global warming is considered one of the most serious and pressing environmental issues in the world, which opens possibilities for finding decisive and effective strategies to reduce the accumulation of gases, especially carbon dioxide emissions. Fortunately, algae mainly depend on CO2 gas in the photosynthesis process, and the algal biomass produc...

Patients undergoing radiotherapy may suffer from many harmful effects including gut microbiota injury, therefore, the use of exogenous probiotics is suggested to reduce these effects. Aim: The present study aimed to determine the possible protective effect of Spirulina platensis and Chlorella vulgaris against radiation-induced hematological and bio...

The sugarcane industrial wastewater is considered as one of the main sources of River Nile pollution. Here we study the possibility of using sugarcane wastewater effluent amended with molasses and clay factory as a culture medium for growth and biomass production of Chlamydomonas reinhardtii and Azotobacter chroococcum and the possibility of using...

Zinc oxide nanoparticles (ZnO-NPs) have gained attention due to their distinctive properties and applications. In the current study, we developed an eco-friendly, economical, and green route for the synthesis of ZnO-NPs using the aqueous extract of the brown marine alga Cystoseira crinita (Fucales; Sargassaceae). ZnO-NPs were characterized by UV-Vi...

Zinc oxide nanoparticles (ZnO-NPs) are widely used in industrial and agricultural applications in addition to cosmetic products. However, the extensive use of ZnO-NPs can impose serious environmental problems on the aquatic ecosystem. So far, the hazardous impact of ZnO-NPs on phytoplankton is not well studied. Among myriad aquatic microorganisms,...

The Bacillariophyta Amphora coffeaeformis (C.Agardh) Kutzing was grown under indoor laboratory conditions using different nitrogen sources including magnesium nitrate ,nitric acid and urea to evaluate whether the addition of magnesium ions affect the biomass accumulation of the grown alga under this study. Concerning the effect of different nitroge...

This study is performed on six wastewater stations that discharging wastewater into Qarun lake, El-Fayoum Govenorate, Egypt, to assessment wastewater treatment on the period from April 2017 to February 2019. Sewage treatment plants use different biological treatment technologies (conventional activated sludge, oxidation ditch, aeration). In this in...

During a recent floristic–taxonomic study on the algal flora, including diatoms, from the estuary of the Damietta Branch of the Nile in Egypt, an interesting epilithic diatom species belonging to the genus Seminavis (Naviculaceae) was collected and investigated using both light and scanning electron microscopy. This new diatom species shares morpho...

Heavy metals are present in natural water, but the increase of heavy metals in the Nile River poses a threat to fresh water and ecosystems due to its toxicity. Therefore, this study concerned with the measurement of heavy metal content (Fe, Mn, Zn, Cu and Pb) in 15 locations representing four sectors exposed to the discharge of wastewater at Aswan...

As a result of rapid growth in the population and manufacturing, the demand for ethanol is increasing continuously in worldwide. Because, biofuels produced from first and second-generation became unable to meet the international demand of bioethanol because of their needed value for food and feed. So, algae are among the most important sources of p...

The results showed that water treatment negatively affected the concentration of turbidity, hydrogen ion concentration, total hardness and magnesium hardness, while concentrations were not changed or were close due to the processes of water treatment for both electrical conductivity and total dissolved salts and calcium hardness in comparison of th...

The pattern growth of Leptolyngbya (plectonema) nostocorum on layer of porcelain of washing basin was remarkable, such finding attracts our interest to conduct this research. Despite the unfavorable conditions, the growth of alga was not affected. It was subjected to pressure as a result of flowing of water from tap with ranges from 0.1-7.6 liters...

Rice straw (RS) is one of the main agriculture residues in Egypt. So, this study was performed on rice straw as a resource for production of bioethanol. Fermenting agricultural biomass, such as rice straw to ethanol is a promising solution to an ongoing waste problem. However, the biomass must first be pretreated to break down lignin, thereby incre...

In this work, we aimed to evaluate the pollution impact of wastewater effluent on aquatic environment using certain bacteriological, biochemical, hematological and immunological parameters of Nile tilapia (Oreochromis niloticus). Fish and water samples were collected from Lake Nasser (as control or unaffected region) and both of El-Sail drain and E...

The distributions of major phytoplankton groups were quantified to estimate the relative contribution of different groups to spatiotemporal dynamics in the northern part of Damietta branch, River Nile, Egypt, in response to a complex of physical and chemical conditions. The study was based on seasonal sampling over one year (summer 2015 to spring 2...

The distributions of major phytoplankton groups were quantified to estimate the relative contribution of different groups to spatiotemporal dynamics in the northern part of Damietta branch, River Nile, Egypt, in response to a complex of physical and chemical conditions. The study was based on seasonal sampling over one year (summer 2015 to spring 2...

The distributions of major phytoplankton groups were quantified to estimate the relative contribution of different groups to spatiotemporal dynamics in the northern part of Damietta branch, River Nile, Egypt, in response to a complex of physical and chemical conditions. The study was based on seasonal sampling over one year (summer 2015 to spring 2...

the aim of present study is to investigate the effect of different nitrogen sources and their availability on the growth and lipid production in the microalga Chlorella sp. The results revealed that proline, as a nitrogen source, showed the lower ration among different nitrogen sources. This is may be occurred because lipid also plays a role as an...

During the seasonal survey and routine monitoring of benthic diatoms of the Damietta Branch of the River Nile (Egypt), in the period spring 2015 - winter 2016, five epilithic Navicula species rarely-recorded in Egyptian fresh/brackish waters were found: N. erifuga Lange-Bertalot, N. flandriae Van de Vijver et A. Mertens, N. recens (Lange-Bertalot)...

In this study, morphological and ecological characteristics of three Egyptian Cyanophyceae genera; Oscillatoria (five species), Lyngbya (three species) and Anabaena (three species) were analyzed using numerical taxonomic system of multivariate statistical program. Data were analyzed by clustering method and similarity coefficients using NTSYSpc ver...

In this study, morphological and ecological characteristics of three Egyptian Cyanophyceae genera; Oscillatoria (five species), Lyngbya (three species) and Anabaena (three species) were analyzed using numerical taxonomic system of multivariate statistical program. Data were analyzed by clustering method and similarity coefficients using NTSYSpc ver...

Two Species of cyanobacteria: namely, Anabaena variabilis and Nostoc linckia were isolated from Baltem and Sedi-Salem (saline-sodic soils), respectively (Kafr El-Sheikh Governorate, Egypt). A. variabilis was able to grow in salinity level between 4-6 g L -1 NaCl; above 6 g L -1 NaCl the growth rate was relatively constant till 10 g L -1 NaCl. Over...

Abstract The current study was performed on a farm land at El-Khanka District, Kalyoubia Governorate where the land showed symptoms of increase in its salt content. Some of the physical and chemical characteristics of the collected soil samples were determined. Only two halotolerant species of algae were isolated from the soil samples containing lo...

N.entophytum and N.paludosum were cultivated and maintained in Z-nitrogen free medium under constant growth conditions(26 C and 1500 Lux) . Both species were identified to basic taxonomic units(species). Cultural and plant mass characteristics were evaluated.Analyses of some physiological and biochemical characters, protein pattern as well as total...

A new species Composopogon helwanii belonging to family Compsopognaceae was collected from Ain Helwan spring, South of Cairo. The specimen is relatively long and profusely branched with dark greyish green colour which changes to pink red if placed in freshwater. A complete morphometric description is provided with a comparative study of already kno...