Mohamed A Aly-Eldeen | National Institute of Oceanography and Fisheries (original) (raw)

Papers by Mohamed A Aly-Eldeen

Scientific Data, Jan 8, 2024

the Mediterranean Sea has been sampled irregularly by research vessels in the past, mostly by nat... more the Mediterranean Sea has been sampled irregularly by research vessels in the past, mostly by national expeditions in regional waters. to monitor the hydrographic, biogeochemical and circulation changes in the Mediterranean Sea, a systematic repeat oceanographic survey programme called Med-SHIP was recommended by the Mediterranean Science Commission (CIESM) in 2011, as part of the Global Ocean Ship-based Hydrographic Investigations Program (GO-SHIP). Med-SHIP consists of zonal and meridional surveys with different frequencies, where comprehensive physical and biogeochemical properties are measured with the highest international standards. The first zonal survey was done in 2011 and repeated in 2018. In addition, a network of meridional (and other key) hydrographic sections were designed: the first cycle of these sections was completed in 2016, with three cruises funded by the EU project EUROFLEETS2. This paper presents the physical and chemical data of the meridional and key transects in the Western and Eastern Mediterranean Sea collected during those cruises.

Acta Oceanologica Sinica, Jul 5, 2016

The exploitation of different plant materials for the biosynthesis of nanoparticles is considered... more The exploitation of different plant materials for the biosynthesis of nanoparticles is considered a green technology because it does not involve any harmful chemicals. In this study, iron oxide nanoparticles (Fe 3 O 4-NPs) were synthesized using a completely green biosynthetic method by reduction of ferric chloride solution using brown seaweed water extracts. The two seaweeds Padina pavonica (Linnaeus) Thivy and Sargassum acinarium (Linnaeus) Setchell 1933 were used in this study. The algae extract was used as a reductant of FeCl 3 resulting in the phytosynthesis of Fe 3 O 4-NPs. The phytogenic Fe 3 O 4-NPs were characterized by surface plasmon band observed close to 402 nm and 415 nm; the obtained Fe 3 O 4-NPs are in the particle sizes ranged from 10 to 19.5 nm and 21.6 to 27.4 nm for P. pavonica and S. acinarium, respectively. The strong signals of iron were reported in their corresponding EDX spectra. FTIR analyses revealed that sulphated polysaccharides are the main biomolecules in the algae extracts that do dual function of reducing the FeCl 3 and stabilizing the phytogenic Fe 3 O 4-NPs. The biosynthesized Fe 3 O 4-NPs were entrapped in calcium alginates beads and used in Pb adsorption experiments. The biosynthesized Fe 3 O 4-NPs alginate beads via P. pavonica (Linnaeus) Thivy had high capacity for bioremoval of Pb (91%) while that of S. acinarium (Linnaeus) Setchell 1933 had a capacity of (78%) after 75 min. The values of the process parameters for the maximum Pb removal efficiency by Fe 3 O 4-NPs alginate beads synthesized via P. pavonica (Linnaeus) Thivy were also estimated.

Egyptian Journal of Aquatic Biology and Fisheries, Aug 24, 2019

Untreated or poorly treated industrial wastes, heavy metals and other pollutants are released int... more Untreated or poorly treated industrial wastes, heavy metals and other pollutants are released into the Nile Delta canals network; causes accumulation of various heavy metals in the fish from sediments, water and food. The present study aimed to evaluate the effect of heavy metals on the ovary of Tilapia zillii in some River Nile canals, at Nile Delta, Egypt. A total of 502 specimens of adult Tilapia zillii were monthly collected from Zifta, Shubra Malakan and El-Nasria stations at El-Gharbia Governorate, during the period from December, 2017 to November, 2018. Heavy metals (Cu, Pb, Ni, and Cd) were measured in the ovary of the fish at three stations. Histopathological changes in the ovary were photographed and described. Results showed that the highest annual averages value of heavy metals concentrations in the ovary of T. zillii were recorded at El-Nasria station, followed by Shubra Malakan station and reached to its lowest value at Zifta station. The mature oocytes in the ovaries of Tilapia zillii had the highest value (74.43%) at Zifta, medium value (49.87%) in the ovaries fish at Shubra Malakan and lowest value (15.07%) in the ovaries of fish at El-Nasria. The percentage of mature oocytes decreases and atresia increases with increase heavy metals concentrations. Therefore, stopping of maturation was noticed in some ovaries of fish collected from El-Nasria station (with the highest heavy metals concentrations). The histopathological features in the ovaries of T. zillii, collected from Shubra Malakan and El-Nasria stations showed degenerative and necrotic changes in the oocytes and proliferative changes in most oocyte's granulosa. The ovarian cells of T. zillii converted to testicular cells. The histopathological alterations observed in the ovary may be attributed to the effects of heavy metals in the agricultural, industrial and sewage wastes discharged into El-Nasria station at Omar Bey Drainage. This study concluded that the increase in heavy metals causes increased atresia in the ovary Tilapia zillii. Therefore, the technical treatment must be made to the agricultural, industrial and sewage wastes discharged into Omar Bey Drainage.

Oceanologia, 2022

Abstract In this study, biosynthesized nanoparticles using chitosan, Ulva fasciata, and Avicennia... more Abstract In this study, biosynthesized nanoparticles using chitosan, Ulva fasciata, and Avicennia marina leaves extracts (A, B, and C, respectively), were evaluated as paint additives to control marine fouling on different substrates. These biocidal nanoparticle compounds were prepared using a green biosynthesis method. Their characterizations were conducted using Fourier-Transform Infrared spectroscopy and Transmission electron microscopy. Each nanoparticle compound was mixed with a prepared paint, resulting in three formulations for each (e.g. 1C, 2C, 3C), containing 20%, 40%, and 60% by weight. Painted PVC, wood, and steel with these nine paints, and the control were immersed in seawater for different periods. After two months of immersion, the least number of fouling species, (one species) was recorded on both the wood and steel panels that were coated with paint (1C). Meanwhile, after four months, the least numbers of fouling (four and six species) were recorded on wood and steel panels that were coated with paint (3C). After around seven months of immersion, the least numbers of fouling species (five and ten) were recorded on wood and steel panels that were coated with paints (1C and 3C), respectively. The steel panel coated with (3C), harbored ∼2% of the total number of barnacles found on the control, after 7 months of immersion. The superior antifouling agent efficiency of extract (C) nanoparticles can be attributed to its constituents of polyphenols, ammonium compounds, and high concentrations of alcohols, besides the presence of both aromatic and aliphatic amide and amide derivatives.

Egyptian Journal of Aquatic Biology and Fisheries, Oct 8, 2019

In the present study, chitin isolated from locally available shrimp shells was pulverized to obta... more In the present study, chitin isolated from locally available shrimp shells was pulverized to obtain three different particle sizes and then deacetylated to obtain various deacetylation degrees and molecular weights of chitosan. In the batch mode experiment, the removal efficiency of heavy metals [Zn(II), Cd(II), Pb(II), and Cu(II)] from synthetic wastewater solutions with different concentrations ranging from 10-30 mg/l using three molecular weights chitosan was evaluated. Cadmium was the best metal chelated by all three types of chitosan and the extent of adsorption was considerably higher in the type 1 of chitosan sample of small particle size with lower of molecular weight and higher of degree of deacetylation compared with types 2 and 3 chitosans. In addition, the maximum percent removal of heavy metal ions was at concentration 10 and 20 mg/l in order of Cd (II > Pb (II) > Cu (II))> Zn (II), while at concentration 30 mg/l the removal efficiency of chitosan was in order of Cd (II) > Cu (II) > Pb (II) > Zn (II). The influence of pH is presented and the maximum uptake of metal ions was obtained at pH 4.0 at room temperature.

Journal of Environmental Protection, 2016

In order to assess the quality of the Aqaba Gulf coastal waters for the sustainable use and devel... more In order to assess the quality of the Aqaba Gulf coastal waters for the sustainable use and development, and consequently for the national income, four field campaigns were annually carried out during the period from 2011-2013 to monitor hydrographic variables, i.e. temperature, salinity, pH, etc., nutrients, some heavy metals, i.e. iron, lead, copper, cadmium, chromium, etc.

Alfarama Journal of basic & applied sciences (Online), Nov 14, 2021

Organic dyes are major elements in wastewater effluents, caused serious environmental damage and ... more Organic dyes are major elements in wastewater effluents, caused serious environmental damage and human health dangers for that we use of factorial design software to evaluate efficiently factors influencing the adsorption capacity of iron oxide nanoparticles alginate beads (SP-IONPs-ALG) to remove crystal violet (CV), methylene blue (MB) and methyl orange (MO) from aqueous solution. The current work included prepared SP-IONPs-ALG by using green synthesized iron oxide nanoparticles (IONPs) using Spirulina platensis, then coated by alginate. SP-IONPs-ALG characterized by using EDX and SEM then used it as adsorbent for uptake CV, MB and MO from aqueous solution. A 2 4 (CCD) based on single-factor experiments and a four-variables, pH (x 1), interaction time (x 2), dyes conc. (x 3) and sorbent dosage (x 4) used to evaluate efficiency of SP-IONPs-ALG for adsorption of CV, MB and MO from aqueous solution. The outlined results inferred that pH, contact time and adsorbent dosage had positive effect in dyes remove with high removal percentage for CV, MB and MO (93.46%, 96.47% and 94.4%; respectively). Freundlich model was fitting for description adsorption of CV & MB with maximum adsorption capacity (Q max) 344.82 mg g-1 , 416.6 mg g-1 respectively but Langmuir isotherm model more fit to describe the experimental data for representing the adsorption process of MO with maximum adsorption capacity 370.3 mg g-1. The kinetic model fitted well with a pseudo second order rate equation. Furthermore, the reusability of SP-IONPs-ALG was successfully achieved by using HCl and NaOH for (CV & MB) and MO, respectively. Keywords Iron, nanoparticles, Spirulina platensis, alginate beads, crystal violet and dyes removal.

The Egyptian Journal of Aquatic Research, Jun 1, 2016

A hot spot region of the Mediterranean Sea located at Sidikerir west of Alexandria was chosen to ... more A hot spot region of the Mediterranean Sea located at Sidikerir west of Alexandria was chosen to evaluate the present status of its water quality due to the direct impacts of effect of the power station, petroleum pipe company (SUMED) and some tourist villages. Subsurface and near bottom water samples were collected seasonally during 2012 at eight locations to measure physicochemical and nutrient salts characteristics as indicators of the water quality. Temporal, spatial fluctuations as well as statistical correlations between the analyzed variables were examined. They demonstrated a wide range of water temperature (17.14-26.31°C), narrow fluctuations in salinity (37.51-39.71), and well-oxygenated seawaters (4.16-8.00 mg O 2 /l), low amounts of oxidizable organic matter (1.92 mg O 2 /l) and the seawater was slightly alkaline (pH range 8.03-8.53). Nutrient characteristics sustained the levels up to 1.68, 11.00, 8.82, 1.15 and 33.18 lM for reactive phosphates, reactive silicates, ammonium, nitrite and nitrate, respectively. Total nitrogen and total phosphorous were fluctuated between 17.63-118.65 and 0.20-2.80 lM, respectively. Trophic states, as well as factors affecting the water quality of study area, were evaluated. The water quality index WQI demonstrated that Sidikerir water was between medium and good.

The Egyptian Journal of Aquatic Research, Sep 1, 2018

In the present study, the sorption of Eriochrome Black T dye from aqueous solution on waste sludg... more In the present study, the sorption of Eriochrome Black T dye from aqueous solution on waste sludge was investigated by employing the factorial design method. Currently, there are worldwide interests to using inexpensive and commercially available adsorbent materials for contaminant removal. Design expert software was employed to examine the influence of different concentrations of dye, adsorbent dosage, contact time and pH on the removal efficiency of Eriochrome Black T using sludge. Additionally, the factorial design was applied to examine the interaction effect of these four variables on the adsorption process. The results were also subjected to examine the correlation between the actual and theoretical EBT dye removal efficiencies (%) which showed how closely the predicted distribution results followed the experimental values. Moreover, the experimental results were subjected to Halsey and Jovanovic adsorption isotherms to explain the adsorption process. The experimental data followed Jovanovic model with higher R 2 (0.9997) than the Halsey model.

Nanomaterials, Mar 10, 2023

This article is an open access article distributed under the terms and conditions of the Creative... more This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY

Journal of Environmental Protection, 2019

The main objective of this paper is to study the removal of Cadmium(II), Lead(II), Chromium(VI), ... more The main objective of this paper is to study the removal of Cadmium(II), Lead(II), Chromium(VI), and Mercury(II) ions by sorption onto different natural and synthetic nanoparticles. Special attention has been given to the application of fish bone in nanoform as a useful, inexpensive and eco-friendly alternative material. A comparison between natural hydroxyapatite (fish bone), synthetic hydroxyapatite nanoparticles (HAP) and alginate-hydroxyapatite composite (Alg/Hap) to assess their removal efficiencies to remediate the selected heavy metals has been done. Surface characterization by using different techniques has also been performed to understand the influence of surface characteristics of the adsorbent materials in the removal process. Different parameters (pH, contact time, mass dose and metal ion concentration) have been examined to identify the optimum conditions for remediation of different metals from polluted water. The potential applications of the biosorbents for removal and sorption of these metal ions from seawater and wastewater samples were also investigated and evaluated.

Egyptian Journal of Aquatic Biology and Fisheries, Mar 1, 2021

Twelve actinomycete isolates were derived from 6 sediment samples collected from the Red Sea coas... more Twelve actinomycete isolates were derived from 6 sediment samples collected from the Red Sea coast, Egypt. The marine isolate, RS10, the most potent candidate, proved its capability to produce antimicrobial compound(s) that strongly inhibit both Gram-positive and Gram-negative bacteria. RS10 was identified by 16S rRNA gene sequencing as Streptomyces diastaticus LC360811. Culture supernatant of S. diastaticus LC360811 was extracted using n-butanol and tested against bacterial indicator strains using the disc diffusion method. The crude extract was partially purified using column chromatography and assessed for antimicrobial activity. Fraction no. 35 showed the highest antimicrobial activity against Acinatobacter sp. (34 mm), Pseudomonas aeruginosa ATCC 9027 (30 mm), Candida albicans (26 mm), Staphylococcus aureus ATCC 47077 (25 mm), Aeromonas hydrophila (23 mm), Streptococcus iniae (22 mm) and Borditella sp. (18 mm). This active fraction was then identified as veratraldehyde using spectroscopic techniques: GC-MS-MS and HPLC (diode array detector) and compared with the authentic reference. Veratraldehyde as a natural preservative proved to be a good candidate to preserve the flavor of juice, yoghurt and fermented milk and was able to control the growth of bacterial pathogens compared to the non-treated products till day fourteen.

Egyptian Journal of Aquatic Biology and Fisheries, May 12, 2019

To shed some light on distribution, abundance and diversity of zooplankton groups in Lake Timsah,... more To shed some light on distribution, abundance and diversity of zooplankton groups in Lake Timsah, four cruises (spring 2015, summer 2015, autumn 2015, and winter 2016) were carried out. In the present result, Lake Timsah zooplankton were comprised 13 groups of the animal kingdom include, Copepoda (with relative abundance of 39.44%); Rotifera (32.72%); Mollusca (15.15%); Tintinnida (4.55%); Polychaeta (3.43%); Cirripedia (1.62%); Decapoda (1.24%); Cladocera (0.94%); Ostracoda (0.57%); Appendicularia (0.19%); Fish egg (0.06%); Foramenifera (0.04%) and Cnidaria (0.04%). Copepoda was found to be the most diversified group during the study period, it represented by 62 species comprised 44.93% of the total recorded species, followed by Rotifera (33 species, 23.91%), Tintinnida (18 species, 13.04%), Cladocera (10 species, 7.25%), Ostracoda (5 species, 3.62%), Mollusca (4 species, 2.90%), Appendicularia (3 species, 2.17%), Cnidaria (2 species, 1.45%) and only one species of Foramenifera represented 0.72% of the total recorded zooplankton species. Seasonally, zooplankton was flourished in summer, while winter is the lowest abundant season. Spatially, because of the difference of water masses entering the lake, each group is dominant in a certain region. Copepods are common in sites that near of Suez Canal due to the presence of saline water masses. While, rotifers and other freshwater zooplanktons are dominant in sites that near freshwater masses, such as western lagoon.

Environmental Monitoring and Assessment, Dec 12, 2017

The defluoridation from aquatic medium by raw marine algae, Ulva lactuca, was investigated. The e... more The defluoridation from aquatic medium by raw marine algae, Ulva lactuca, was investigated. The element components and adsorbent's properties were determined. The influence of pH, contact period, and Ulva sp. weight on the deflouridation was achieved. The complete defluoridation of 10 mg F − /l solution was obtained within 10 min at definite pHs. Fourteen adsorption isotherms and four kinetic models (pseudo-first order and pseudo-second order, Elovich, and intraparticle diffusivity) were studied. The most adequate model was performed by using five error functions. The application of chi-squared test indicated that the nonlinear isotherm models (two and three parameters) were more applicable than the linear ones. The adsorption kinetic proceeded by pseudo-first-order model. The adsorption mechanism was very complex; thus, the solute distribution step was not the only dominant one during the process. The adsorption seemed to be a physical negative binding cooperative type with activation energy and free energy of 3.16 and − 1.672 kJ/mol, respectively. Thus, raw marine algae, Ulva lactuca, can be used as an adsorbent in solving the fluoridation problem in aquatic mediums throughout the world due to their fast procedure, high efficiency, low effort, and high economic value.

Aquatic Science and Fish Resources (ASFR) (Print), Dec 1, 2020

In the current study the free floating macrophyte Pistia stratiotes L. belonging to family (Arace... more In the current study the free floating macrophyte Pistia stratiotes L. belonging to family (Araceae) powder was used as bioadsorbent material for immobilization of Cadmium from contaminated water samples. Design experiment was employed to reduce the number of trials and examine the effect of different controlling parameters at the same time on cadmium adsorption process. From the results we observed that the size of powdered materials were ranged from 116.6-187.5 nanometers. The maximum removal percent (92 %) was recorded at pH 8, 190 min. of contact time, 28.75 mg/l of Cadmium concentration and 3.875 g of adsorbent material.

Egyptian Journal of Chemistry, May 11, 2022

Egyptian Journal of Aquatic Biology and Fisheries, Aug 29, 2019

The concentrations of heavy metals Cu, Cd, Pb, and Zn in the Abu-Qir water and in the edible port... more The concentrations of heavy metals Cu, Cd, Pb, and Zn in the Abu-Qir water and in the edible portions of the inhabitant common invertebrate Portunus pelagicus were determined in the period (spring 2016-winter 2017). Generally, there was an increasing in the concentration of these measured elements comparing with the previous studies. The obtained data indicated a seasonal and spatial variation of heavy metals concentrations. The highest concentrations in the bay water were recorded during summer season, while spring showed the minimum values. On the other hand, the element levels in the crab tissue were the maximum during autumn and the minimum during winter, among the measured heavy metals Pb was the highest concentration element both in the water and in the animal tissues. It was noticed that the site located near the connection with Lake Edku (Lake-Bay connection) recorded the maximum readings which reveals the effect of the discharged water from the lake.

Marine Pollution Bulletin, Jun 1, 2023

Environmental Science and Pollution Research, Jan 6, 2021

Brown seaweeds are rich in polysaccharides, such as fucoidan (FUC) which has shown beneficial eff... more Brown seaweeds are rich in polysaccharides, such as fucoidan (FUC) which has shown beneficial effects in several medical conditions. The aim of the present study was to assess the antioxidant, anti-inflammatory, and hepatoprotective properties of Colpomenia sinuosa– and Sargassum prismaticum–isolated FUC in vitro and in vivo. The hot acid extraction method was used to isolate FUC from C. sinuosa (FCS) and S. prismaticum (FSP) species. The antioxidant, anticancer, as well as the effect on neurotransmitter-degrading enzyme and disaccharidase activities were measured using standard protocols. Moreover, the hepatoprotective effect of two FCS doses (100 and 200 mg/kg) on paracetamol-administered rats (one dose of 1 g/kg) were evaluated by measuring blood liver function markers, hepatic pro-oxidants as malondialdehyde (MDA) and nitric oxide (NO), antioxidants as glutathione (GSH) and glutathione peroxidase (GPx), proinflammatory markers as inducible nitric oxide synthase (iNOS), interleukin 1β (IL-1β), tumor necrosis factor-α (TNF-α), and liver histology. The crude fucoidan yield was 15.6% and 14.8% of C. sinuosa and S. prismaticum dry weights, respectively. The antioxidant effects and cytotoxic activity on hepatic cancer cell were higher for FCS than FSP. Moreover, in vivo data showed that FCS administration at both doses significantly improved liver functions and alleviated histological alterations, hepatic inflammation, and oxidative stress following paracetamol intake. In conclusion, fucoidan exerts anti-inflammatory, antidigestive enzyme activity, antioxidant, anticancer, and hepatoprotective effects.

The Egyptian Journal of Aquatic Research, Sep 1, 2019

Green biosynthesis of nanoparticles gives a good alternate to chemical synthesis process. Two sam... more Green biosynthesis of nanoparticles gives a good alternate to chemical synthesis process. Two samples of iron oxide nanoparticles (Fe 3 O 4-NPs) have been synthesized using brown (Colpomenia sinuosa) and red (Pterocladia capillacea) seaweed aqueous extracts, separately for reducing ferric chloride. The synthesized nanoparticles were characterized using the standard methods. The FT-IR results demonstrated that the tested extracts contained different biocompounds, which were responsible for synthesizing and capping of Fe 3 O 4-NPs. The UV-Visible spectra of each obtained nanosample gave two absorption peaks at 402 and 415 nm signifying that Fe 3 O 4 nanoparticles are formed. The SEM images of the two Fe 3 O 4-NPs samples synthesized by C. sinuosa and P. capillacea aqueous extracts revealed their size as 11.24-33.71 nm and 16.85-22.47 nm, respectively. It was also found that Fe 3 O 4-NPs was present in the nanospheres shape. Furthermore, the EDX spectra affirmed the existence of Fe 3 O 4 nanoparticles in the two biosynthesized nanosamples. The synthesized Fe 3 O 4-NPs exhibited wide spectrum of antibacterial potency against the growth of Àve (8.37 ± 6.62 mm) and +ve (5.75 ± 2.25 mm) Gram bacteria. Moreover, Fe 3 O 4-NPs of C. sinuosa exhibited an excellent antifungal potency against Aspergillus flavus (9 mm) and Fusarium oxysporum (6 mm) compared with Fe 3 O 4-NPs of P. capillacea (7 & 5 mm) and both negative and positive controls.