Sara Sayed Mahmoud Sayed
- [email protected]
- [email protected]
- Nationality: Egyptian
- Governorate: Giza
- Gender: Female
Biography
Dr. Sara Sayed is an Assistant Professor of Environment Research at Theodor Bilharz Research Institute (TBRI). She has her M.Sc. and Ph.D in Ecology from Cairo University. Currently, she is a director of Climate Change Research Program (CCRP) at TBRI. She is a member of the Executive Team for Digital Transformation and Data Center at TBRI. She is interested in studying environmental sciences, particularly biodiversity, water quality, and the impacts of climate change. She has participated as a member and Co-PI of four projects funded by TBRI. She has several publications in national and international journals. She has participated as a reviewer in various international journals indexed in Springer, Elsevier, and Wiley publishers.
Research Fields
Environmental Research, Water quality, Biodiversity
- Division : Environmental Research and Medical Malacology Division
- Department : Environmental Research Department
- Specialization : Science
- Degree : Assistant Professor
- Job Title : Assistant Professor
- Work Status : Active / In Service
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Published Research Papers (27)
Estimation of pesticide residues in certain Gharbeya watercourses, Egypt: Insight into bacterial abundance and Metallothionein Biomarker in snails
ScopusResearch Type: Research article | Domain: Environmental pollution and remediation
Publish Type: Published
Publish Date: 2026-03-28
This study investigates metallothionein gene expression in Biomphalaria alexandrina as a biomarker for pesticide stress and examines bacterial abundance in pesticide-contaminated water in Gharbeya, Egypt. Pyrethroids and triazoles were detected in water and sediment samples, exceeding WHO limits. Cy...
Spatial Distribution of Polychlorinated Biphenyls in Some Watercourses: A Study on Water Quality, Risk, and Effect on Macroinvertebrates
ScopusResearch Type: Research article | Domain: Environmental pollution and remediation
Publish Type: Published
Publish Date: 2025-11-11
Continued monitoring of polychlorinated biphenyl (PCB) residues in inland watercourses contributes indirectly to Sustainable Development Goal 14 by preserving aquatic biodiversity and ecosystems. Therefore, the current work aims to monitor PCBs in water courses of Giza, Al-Qaliobiah, and Al-Gharbiah...
Seasonal Monitoring of the River Nile in the Area of Greater Cairo Using a Combined Approach of Certain Chemical Criteria and Macroinvertebrates Matrices
ScopusResearch Type: Research article | Domain: Environmental pollution and remediation
Publish Type: Published
Publish Date: 2025-09-01
Macroinvertebrates are valuable surrogates in reflecting the health of river streams through their abundance, taxa richness (TR), and functional feeding groups. The present work aimed at monitoring the water quality (WQ) of the River Nile in the greater Cairo area, the most crowded with multiple hum...
Biological Diversity Associated with Pesticides Residues in Certain Egyptian Watercourses
ScopusResearch Type: Research article | Domain: Environmental pollution and remediation
Publish Type: Published
Publish Date: 2025-05-09
The aquatic environment has been contaminated by pyrethroids and triazole pesticide applications, which pose serious health risks to the aquatic ecosystem and human beings. Therefore, the current study aims to evaluate water quality parameters, fungal diversity, and distribution of snails and aquati...
Climate change impacts on freshwater toxins, and its health effects
ScopusResearch Type: Research article | Domain: Environmental pollution and remediation
Publish Type: Published
Publish Date: 2025-04-01
The influence of the global warming resulting from climate change (CC) together with the presence of freshwater toxins has led to many risks for different water uses and human health. The present chapter discussed the potential risks associated with the effect of global warming on the diffusion of f...
Influence of Chlorella vulgaris and Pediastrum boryanum extracts carried on nanocellulose on the immune response of Biomphalaria alexandrina snails against Schistosoma mansoni infection
ScopusResearch Type: Research article | Domain: Environmental pollution and remediation
Publish Type: Published
Publish Date: 2025-01-01
Continuous efforts are made to explore alternative methods for reducing Schistosomiasis. So, this study evaluated the effectiveness of Chlorella vulgaris and Pediastrum boryanum extracts carried on their nanocrystalline cellulose (NCC) as immunostimulants for Biomphalaria alexandrina snails against...
Protozoan and helminths infestation of Nile tilapia Oreochromis niloticus and its correlation with certain water quality variables along river Nile in the area of Greater Cairo
ScopusResearch Type: Research article | Domain: Environmental pollution and remediation
Publish Type: Published
Publish Date: 2024-03-01
Pollutants and parasites represent stressors for fish at the individual, population, or community levels. The current study outlines the seasonal infestation pattern of Oreochromis niloticus by protozoan and helminths parasites linked to some physicochemical parameters (pH, dissolved oxygen, total d...
Study of the chemical composition and anesthetic effect of Cladophora glomerata extract on the physiological and hematological aspects of Biomphalaria alexandrina snails as biological models
ScopusResearch Type: Research article | Domain: Environmental pollution and remediation
Publish Type: Published
Publish Date: 2024-02-07
Algae produce numerous biologically active substances, some of which could be turned into brand-new medications. Thus, the current work utilized Biomphalariaalexandrina snails as a biological model to assess the anesthetic effect of Cladophoraglomeratamethanolic extract. After 24 h of exposure follo...
Comparative study on Lake Manzala in Egypt after and before development and purifications: Ecosystem and biomarkers; biochemical, histopathological and immunohistochemical
ScopusResearch Type: Research article | Domain: Environmental pollution and remediation
Publish Type: Published
Publish Date: 2023-12-01
The present work aims to evaluate the impact of Lake Manzala development, started in 2017, on lake water quality and biomarkers of Lake Oreochromis niloticus and Biomphalaria alexandrina samples from Dakahlia and Port Said during 2021 and compare it with the results of a series of studies concerning...
Impacts of Climate Change on Water Quality using GIS Technique in Water Courses at Egyptian Delta Governorates
ScopusResearch Type: Research article | Domain: Environmental pollution and remediation
Publish Type: Published
Publish Date: 2023-11-01
The present work aimed to study the water quality of six Delta Egyptian governorates using ArcGIS maps. Compared to winter, water temperature was higher during summer in all selected governorates. Dissolved oxygen (D.O.) was higher than in summer during winter in all selected governorates. The maxim...
Assessment of schistosomiasis transmission in the River Nile at Greater Cairo using malacological surveys and cercariometry
ScopusResearch Type: Research article | Domain: Environmental pollution and remediation
Publish Type: Published
Publish Date: 2022-09-10
Continuous field studies on the abundance and distribution of freshwater snails and cercarial populations are important for schistosomiasis control programs. In the present work, snail surveys and cercariometry were conducted for four successive seasons at 12 sites on the Nile River banks in the are...
Behavioral, Biochemical, and Histological Evaluation of Artificial Light on Infected Freshwater Snails Bimophalaria alexandrina by Schistosoma mansoni
ScopusResearch Type: Research article | Domain: Environmental pollution and remediation
Publish Type: Published
Publish Date: 2022-07-01
Artificial light near rivers and lakes can have a substantial impact on aquatic species, especially freshwater snails, in terms of behavioral and physiological parameters. The extent to which this alternation may occur is unknown, particularly if this snail serves as an intermediate host for the par...
Effect of some freshwater cyanobacteria on Oreochromis niloticus (L.) fish and water quality in Egyptian aquaculture ponds
ScopusResearch Type: Research article | Domain: Environmental pollution and remediation
Publish Type: Published
Publish Date: 2022-04-11
The present study aims to evaluate the potential effects of cyanobacteria on water quality parameters and Oreochromis niloticus in the fish ponds at Al-Abbassa Fish Hatchery, Sharkia Governorate, Egypt. The study identified five cyanobacterial genera: namely, Anabaena, Gleotrichia, Lyngbya, Oscillat...
Effect of methyl gallate on immune response of Biomphalaria alexandrina (Ehrenberg, 1831) snails to infection with Schistosoma mansoni (Sambon, 1907)
ScopusResearch Type: Research article | Domain: Environmental pollution and remediation
Publish Type: Published
Publish Date: 2021-01-06
Schistosomiasis still affects a lot of people in many developing countries. Reducing the disease dissemination has been the target of various studies. As methyl gallate has antioxidant properties, it is assumed that it can be a good candidate for stimulating the immune response of snails. So, the ai...
Assessment of the molluscicidal activity of the methanolic seed extracts of Ziziphus spina-christi and Carica papaya on immunological and molecular aspects of Biomphalaria alexandrina snails
ScopusResearch Type: Research article | Domain: Environmental pollution and remediation
Publish Type: Published
Publish Date: 2020-12-26
Medicinal plants are still less expensive, safe to non-target organisms, and eco-friendly. The present work aims to evaluate the molluscicidal activity of the methanolic extract of Ziziphus spina-christi and Carica papaya seeds against Biomphalaria alexandrina snails. The half lethal concentrations...
Pollution by organochlorine and organophosphorus pesticides residues in watercourses of some Egyptian governorates with reference to the distribution of macroinvertebrates
ScopusResearch Type: Research article | Domain: Environmental pollution and remediation
Publish Type: Published
Organization: w
Publish Date: 2020-08-12
The paper reports an assessment of the quality of some water courses located in three Egyptian governorates by investiga tion of organochlorine and organophosphorus pesticides residues, and the distribution of macroinvertebrates. Water and sediment samples were collected from the investigated...
Reproductive and developmental alterations in Biomphalaria alexandrina snails exposed to three phenolic compounds
ScopusResearch Type: Research article | Domain: Environmental pollution and remediation
Publish Type: Published
Publish Date: 2019-11-06
The present work aims to assess the reprotoxicity in Biomphalaria alexandrina snails and developmental and hatchability alterations of their eggs after exposure to three phenolic compounds, viz., salicylic acid, benzoic acid and pyrogallol. The half lethal concentrations (LC50) of the three tested c...
Reprotoxicity of 4-nonylphenol to Biomphalaria alexandrina snails at certain temperatures
ScopusResearch Type: Research article | Domain: Environmental pollution and remediation
Publish Type: Published
Publish Date: 2019-05-02
One of the most common compounds in pesticide formulations, plastics, and papers is 4-nonylphenol (4-NP). It is contained in agricultural, industrial, and wastewater effluents, which when discharged into surface waters affect aquatic fauna. Therefore, the present study aimed to use Biomphalaria...
Toxicological assessment of lambda-cyhalothrin and acetamiprid insecticides formulated mixture on hatchability rate, histological aspects, and protein electrophoretic pattern of Biomphalaria
ScopusResearch Type: Research article | Domain: Environmental pollution and remediation
Publish Type: Published
Publish Date: 2018-09-21
Several formulated mixtures of pesticides are widely used in modern agriculture. Nevertheless, the agriculture runoff causes a serious damage to the aquatic ecosystem. Therefore, the present study aims to use B. alexandrina snails as bioindicators for 30 g/l lambda-cyhalothrin and 17 g/l acetamiprid...
Ecological assessment of the river nile status around gizert el-warrak using phytoplankton and macroinvertebrates assemblages
ScopusResearch Type: Research article | Domain: Environmental pollution and remediation
Publish Type: Published
Publish Date: 2018-08-05
Biological assessment is considered a useful tool for assessing the ecological status of the aquatic ecosystems. Therefore, the goal of the present study was to use phytoplankton and macroinvertebrates as biological tools for ecological assessment of the River Nile around Gizert El-Warrak. A total o...
Potential role of Ceratophyllum demersum in bioaccumulation and tolerance of some heavy metals
ScopusResearch Type: Research article | Domain: Environmental pollution and remediation
Publish Type: Published
Publish Date: 2018-08-01
Contamination of aquatic ecosystems by heavy metals is considered one of the most major threats of the aquatic life. So, the present work aims to investigate the accumulation and tolerance of Ceratophyllum demersum plant to different concentrations of Pb+2, Al+3 and Cd+2 during four treatment period...
Association pattern among different snail species and other types of macroinvertebrates in certain freshwater courses in Egypt
ScopusResearch Type: Research article | Domain: Environmental pollution and remediation
Publish Type: Published
Publish Date: 2018-07-10
Effects of sub-acute exposure of pesticide aronil (propanil) on haematology and serum biochemistry of Oreochromis niloticus juvenile was investigated in the present study. Sub-acute doses (0.21 mg/l, 0.43 mg/l and 0.83 mg/l) were derived from 1/20, 1/10 and 1/5 of the 96h LC50 (4.17 mg/l) of aronil,...
Biomarkers of oxidative stress in Biomphalaria alexandrina snails for assessing the effects of certain inorganic fertilisers
ScopusResearch Type: Research article | Domain: Environmental pollution and remediation
Publish Type: Published
Publish Date: 2017-08-07
Freshwater snails are often used to monitor aquatic pollution. The present study aims to use Biomphalaria alexandrina snails as bio-indicators for three types of NPK fertilisers (high nitrogen, high phosphorus and balanced). Data showed that high phosphorus and high nitrogen fertilisers have a negat...
Factors affecting the molluscicidal activity of Asparagus densiflorus and Oreopanax guatemalensis plants and Difenoconazole fungicide on Biomphalaria alexandrina snails
ScopusResearch Type: Research article | Domain: Environmental pollution and remediation
Publish Type: Published
Publish Date: 2016-04-06
Many factors may enhance or suppress the molluscicidal activity regardless of their origin. The present study aims to determine the molluscicidal activity of two plants, namely Asparagus densiflorus and Oreopanax guatemalensis besides, Difenoconazole fungicide against Biomphalaria alexandrina snails...
Effects of three inorganic fertilizers on the biology and histopathology of infected Biomphalaria alexandrina snails
ScopusResearch Type: Research article | Domain: Environmental pollution and remediation
Publish Type: Published
Publish Date: 2016-01-01
The present work was carried out to calculate the half lethal concentrations (LC50) of three inorganic fertilizers (balanced, high phosphorus and high nitrogen fertilizers) on Biomphalaria alexandrina snails and to demonstrate measurable effects on infected B. alexandrina with Schistosoma mansoni mi...
Biological studies on the effect of certain inorganic fertilizers with observations on protein electrophoretic pattern of Biomphalaria alexandrina snails
ScopusResearch Type: Research article | Domain: Environmental pollution and remediation
Publish Type: Published
Publish Date: 2015-01-01
The present study deal with three inorganic fertilizers they were; (balanced, high phosphorus and high nitrogen), their (LC50) values were 505.7, 1600 and 9500 ppm, respectively after 24 hours of exposure. Survival rate of B. alexandrina snails group that exposed to sublethal concentrations of balan...
Impact of Asparagus densiflours and Oreopanax guatemalensis plants and difenoconazole fungicide on biochemical parameters of Biomphalaria Alexandrina snails
ScopusResearch Type: Research article | Domain: Environmental pollution and remediation
Publish Type: Published
Publish Date: 2011-01-01
In this study, the most effective agent was Difenoconazole (Score) followed by Asparagus densiflours then Oreopanax guatemalensis plants against Biomphalaria alexandrina snails. The high concentrations of the three tested agents caused a remarkable reduction in hatchability percent of B. alexandrina...
Ph.D in Science - Environmental Research - Cairo University
2010 to 2015
Assistant Professor
2021 to till now
Assistant Professor at Environmental Research Department, TBRI
Sara Sayed
I have good experience in field trials, monitoring heavy metals and pesticides, identifying macro-invertebrates, and using them in assessing water quality and studying the impacts of different aquatic pollutants on the biological aspects of freshwater ecosystems. Besides, I am interested in learning new techniques to remove pollutants from various water resources, and I have research in this field under publication. I have participated as a member and Co-PI of four projects funded by TBRI. I participated in research on climate change's impact contaminants on water quality in six Delta governorates using GIS techniques.