Sayed Sayed

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Studying the effect of natural extracts to control bacterial contamination of drinking water

Bulletin of Faculty of Science, Zagazig University

Some biological parameter of raw water as the source and treated water in Abassa station,Abu hamm... more Some biological parameter of raw water as the source and treated water in Abassa station,Abu hammad,Sharkia Governarate such as algal count,protozoa,total bacterial count,total coliform and fecal coliform .These results showed that the algal count of algae in treated water ranged between 9 to 36 algal count /1L ,no protozoa , no total coliform and no fecal coliform found in treated water while the count of total bacteria found in treated water ranged between 0 to 2 CFU/1ml.Different bacterial isolates which isolated from different stages in abassa water station (Raw , Filtrate , Treat, Net) and identified by using some biochemical tests such as Staphylococcus spp,E.coli spp,Proteus spp,Salmonella spp,Bacillus spp,Micrococcus spp,Klebsiella spp .Using natural extracts such as moringa olifera seed,okra seed , clove seed and ginger seed as antibacterial activity against some isolated bacteria and results showed that moringa seed extract was the most effective extract as antibacterial activity with concentration 1.0gm/50ml give 28 mm inhibition zone diameter against Stapylococcus spp.

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Israeli-Palestinian Conflict: Genesis and Current Status

CERN European Organization for Nuclear Research - Zenodo, Apr 22, 2022

The relationship between Israel, countries of the Arab East and world powers in the context of solving the Palestinian issue at the turn of the XX-XXI centuries

IJO- International Journal of Social Science and Humanities Research ( ISSN 2811-2466 ), Dec 1, 2020

the paper talks about dissertation paper dealing with the issues of solving the Palestinian-Israe... more

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Israeli-Palestinian Conflict and attempts of its settlement in the framework of relationships between parties at the beginning of the XXI century (2001-2009)

Relaţii Internaţionale Plus, 2019

The article, based on scientific literature from different countries and UN documents, exploring ... more The article, based on scientific literature from different countries and UN documents, exploring the relationship between Israel and Palestine in the Middle East settlement at the beginning of the XXI century in the period of the governments of A. Sharon and E. Olmert (2001-2009). Negotiations between the parties led to nothing and none of the main issues in achieving peace between the Palestinians and Israelis were resolved: Palestinian independence has not yet been proclaimed, refugees cannot return to their places of residence, Jerusalem's status has not been determined, Israel's settlement policy remains unchanged. Keywords: occupation, conflict, agreement, Palestinian-Israeli relations, security, tratative, Israeli settlements in the Palestinian territories, Jerusalem

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Egyptian Journal of Aquatic Research Sedimentological and Environmental Impacts of Development Projects Along the Coast of Hurghada, Red Sea, Egypt

The studies areas lay in Hurghada region include different aspects of coastal development. It rep... more The studies areas lay in Hurghada region include different aspects of coastal development. It represents different environmental problems and threats to the Red Sea ecosystem and geosystem. They include two tourist projects, a central marina for yachts and fishermen and a site for oil exploration and production. All sits have implemented Environmental Impact Assessment studies (EIA). Unfortunately, dredging and landfilling caused severe coast destruction and shoreline change in these areas. All sites have accurately surveyed and environmental problems cited, oceanographic parameters were measured, and 109 samples were collected from the beach and the tidal flat of four sits forming the study area. Grain size, carbonates and organic matter contents, major and trace elements were determined. Cluster analysis and correlations were carried out. The results reflect the impact of coast destruction and shoreline change. Grain size analysis indicated the predominance of coarse grained sedim...

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The relationship between Sofosbovir / Daclatasvir and some risk factors of stroke

Fayoum University Medical Journal, 2022

stroke is acute neurological deficit result from acute focal injury of central nervous system due... more stroke is acute neurological deficit result from acute focal injury of central nervous system due to vascular cause as cerebral infarction. Aim of the Work: To investigate the relationship between (Sofosbovir and Daclatasvir) and some risk factors of stroke. The study was conducted in Fayoum General hospital Virology Unite Fifty HCV positive patients who will receive (Sofosbovir and Daclatasvir) as treatment for HCV for 3 months, were included. They were subjected before start of treatment to laboratory assessment as CBC, HgbA1C .and measurement of carotid intimal medial thickness by carotid Duplex was done. Follow up the patients3monthes after end of treatment by the same laboratory and radiological assessment. Fifty matched healthy volunteers were recruited as controls. Our results show statistically significant higher carotid IMT after treatment compared to before treatment. There is positive correlation between mean IMT and mean TLC and HGBA1C.

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Larvicidal Activity of Menthe longifolia (Lamiaceae) Different Extracts against Culex pipiens L. and Culex antennatus Becker (Diptera: Culicidae)

Larvicidal activity of Menthe longifolia different extracts against lymphatic filariasis vector, ... more Larvicidal activity of Menthe longifolia different extracts against lymphatic filariasis vector, Culex pipiens and Rift Valley Fever vector, C. antennatus was tested. The extraction was carried out using methanol, acetone, chloroform and petroleum ether solvents. Obtained results revealed that petroleum ether extraction from leaves of M. longifolia was more effective against 3 rd instar larvae of C. pipiens and C. antennatus than those of chloroform, acetone and methanol extractions. Methanol, acetone, chloroform and petroleum ether extracts from leaves of M. longifolia recorded LC50 values of 1741.5, 1322.0, 702.4 and 379.5 ppm against C. pipiens third larval instar and 1064.6, 850.3, 459.9 and 250.4 ppm against C. antennatus third larval instar, respectively. In addition, LC90 values recorded 2282.0, 1897.7, 1300.3 and 511.9 ppm by methanol, acetone, chloroform and petroleum ether extract from leaves of M. longifolia against C. pipiens third larval instar and 1596.5, 1388.6, 979.4 and 388.2 ppm against C. antennatus third larval instar, respectively. Also, both C. pipiens and C. antennatus larval and pupal periods were prolonged by all tested extracts at all concentrations used as compared with the untreated groups. Menthe longifolia tested extracts are considered as new promising controlling agents against C. pipiens and C. antennatus, however, more studies are necessary to reach the active ingredient in the tested extracts.

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Coronary artery anomalies in tetralogy of Fallot patients evaluated by multi slice computed tomography; myocardial bridge is not a rare finding

Medicine, 2021

Abstract Based on coronary angiography and interoperative inspection, anomalous origin of coronar... more Abstract Based on coronary angiography and interoperative inspection, anomalous origin of coronary artery crossing the right ventricular outflow tract (RVOT) is common in tetralogy of Fallot (TOF) patients. However, other coronary anomalies may be underestimated due to the overlying myocardium, epicardial fat, or adhesions due to previous palliative surgery. Currently, coronary artery visibility dramatically improved by multislice computed tomography (MSCT). We performed this study to assess the coronary arteries anatomy in TOF patients using MSCT. All TOF patients underwent MSCT examination at our centre from 2013 till 2019 were included. Assessment of the coronary arteries’ origin and course were performed. Presence of myocardial bridge were assessed, and indexed RV mass was calculated. 318 TOF patients were included, median age 2 years (range 1 month–46 years), 175 males (55%). The abnormal coronary artery origin and course were detected in 20 patients (6%); coronary artery crossed RVOT in 13 patients (65%), 5 patients (25%) had a retro-aortic course and 2 patient (10%) had inter-arterial course. Myocardial bridges of left anterior descending artery or/and right coronary artery were reported in 100 patients (36%), no myocardial bridge of left circumflex was reported. RV mass was 29.0 ± 21.1 g/m2. There was no correlation between RV mass and presence of myocardial bridges. MSCT is a useful imaging modality for detection of coronary arteries anomalies in TOF patients. Coronary artery crossing RVOT is not the only abnormal course and myocardial bridging is not a rare finding. Further studies are needed to demonstrate the clinical significance of these observations.

Charge Transport in Solid State Molecular Junctions

ECS Meeting Abstracts, 2013

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Values of Head circumference and Body Height in Sohag children from birth to six years

Sohag Medical Journal, 2017

Introduction:Growth reference values should be based on a representative sample of the population... more Introduction:Growth reference values should be based on a representative sample of the population; for determining growth velocity, longitudinal data are required.The growth supervision of children usinggrowth curves is a widespread and usefultool in general pediatric practice.Head circumference (HC) is one of the anthropometric parameters included in the physical examination of the infant and toddler.Due to the differences in the international and interracial standard charts of anthropometric indices, several researchers around the world have attempted to provide alternative standard charts for measuring the HC at different ages. Aim of the work:The present study was carried out to obtain head circumference and body height values for children from birth to six years.Subjects and methods:The study included1300 child (boys and girls) in different ages from birth to six years and 20 years of sohag governorate in Upper Egypt.The children divided into different ages (at birth, 2 months, 4 months, 6 months, 9 months, 12 months, 18 months, 24 months, 3 years, 4years, 5years and 6years) and in each age there is 50 boy and 50 girl. Head circumference and Body Height were measured andcompared between boys and girls. Results:The mean values of head circumference and body height increase with increase in age and the values were higher in boys than girls in all ages. Conclusion: the growth velocity is higher in boys than in girls in all ages.

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NUCLEATE POOL BOILING FROM PLAIN AND ENHANCED SINGLE TUBE TO R12 AND R134a FOR AIR-CONDITIONING EVAPORATORS

International Conference on Aerospace Sciences and Aviation Technology, 1999

Measurements of pool boiling heat transfer coefficients in pure R12 and R134a are reported for a ... more Measurements of pool boiling heat transfer coefficients in pure R12 and R134a are reported for a plain tube (FYI) and three enhanced tubes: (Screen Matrix tube, (SM) and two integral finned tubes: Radial (RF) and longitudinal LF). The data were taken at saturation temperatures of-5, and 5 , and heat flux range from 2 x 103 to 104 W/m2. All enhanced tubes provide higher boiling coefficients than the plain tube does. The slopes of the boiling coefficient vs the heat flux curves for enhanced tubes are smaller than those for the plain tube, indicating the dominating effect of enhanced surfaces conditions. The mechanism describing the generation, growth and separation of bubbles for tested enhanced tubes was elaborated. The highest boiling coefficient was found to belong to the screen matrix tube , having the highest nucleation sites density. Additional achievement was observed when R134a was tested at the considered operating condition. Two correlations for predicting the boiling coefficients from the present considered surfaces were developed with satisfactory accuracy for the design of refrigerant flooded evaporators.

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Glycogen-based self-healing hydrogels with ultra-stretchable, flexible, and enhanced mechanical properties via sacrificial bond interactions

International journal of biological macromolecules, Jan 19, 2018

The development of hydrogel materials with enhanced mechanical properties is the primary focus in... more The development of hydrogel materials with enhanced mechanical properties is the primary focus in designing autonomous self-healable hydrogel materials. Here, we present a facile and cost-effective method for the autonomous self-healing hydrogel based on Glycogen (Gly/PAA-Fe) with enhanced mechanical properties by simple insertion of ferric ions in the physically cross-linked network via metal-ligand interactions. This dual physically cross-linked hydrogel has an excellent elongation at break and self-healing properties due to the dynamic ionic cross-linking point. This work will encourage researchers to focus on this facile technique for the synthesis of self-healing hydrogel materials with enhanced mechanical properties.

Facile and cost-effective synthesis of glycogen-based conductive hydrogels with extremely flexible, excellent self-healing and tunable mechanical properties

International journal of biological macromolecules, Jan 28, 2018

In materials science and engineering, the designing of hydrogels with excellent self-healing and ... more In materials science and engineering, the designing of hydrogels with excellent self-healing and tunable mechanical properties is an inviting issue. In this study, we introduce the sacrificial bonds interactions in a hybrid hydrogel of natural and synthetic polymers, to give a hydrogel with autonomous self-healing ability and tunable mechanical properties. Glycogen, a natural polymer tends to strengthen the hydrogel while PVA, a synthetic polymer plays a critical role in the flexibility and stretchability of the hydrogel. Hydrogels were designed by the sacrificial non-covalent interactions with physical cross-linking of the polymer chains to the trivalent metal ions. Functional groups of the polymers interact with sacrificial hydrogen bonds with and with the metal ions, they interact through sacrificial coordination interactions with different strength, results tunable sacrificial bonds. Weaker sacrificial bonds rupture prior to the strong sacrificial bonds upon external loading, wh...

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Does vitamin D deficiency predict early conversion of clinically isolated syndrome? A preliminary Egyptian study

The International journal of neuroscience, 2018

It has been suggested that vitamin D influences the immunoregulation and subsequently affects the... more It has been suggested that vitamin D influences the immunoregulation and subsequently affects the risk for conversion of clinically isolated syndrome (CIS) to clinically definite multiple sclerosis (MS). There is little information regarding the relationship between levels of vitamin D and CIS conversion to MS in Egyptian patients. is to study contribution of vitamin D deficiency to conversion of CIS to CDMS and correlation of vitamin D level to cognitive and MRI results. A longitudinal prospective case control study was conducted on forty-three Egyptian patients diagnosed as CIS according to McDonald criteria (2010). Clinical presentation, brain magnetic resonance imaging (MRI) and 25-hydroxyvitamin D levels were evaluated at baseline and after 1 year follow up. The CIS patients that converted to MS showed significant lower vitamin D level (p<0.001) than the non-convertors. Multivariate logistic regression analysis revealed that the CIS patients with lower 25-hydroxyvitamin D le...

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Quantitative analyses of enhanced thermoelectric properties of modulation-doped PEDOT:PSS/undoped Si (001) nanoscale heterostructures

Nanoscale, 2016

Poly(3,4-ethylenedioxythiophene) poly(styrenesulfonate) (PEDOT:PSS) has high electrical conductiv... more Poly(3,4-ethylenedioxythiophene) poly(styrenesulfonate) (PEDOT:PSS) has high electrical conductivity (∼10(3) S cm(-1)) but it exhibits a low Seebeck coefficient (<15 μV K(-1)), resulting in a low power factor. Mixing PEDOT:PSS with nanostructured semiconductors can enhance the Seebeck coefficient and achieve an improved thermoelectric power factor. However, underlying mechanisms for those composite thermoelectric systems are scarcely understood so far. In this study, quantitative analyses on the electrical conductivity and Seebeck coefficient for the heterostructures of nanometer-thick PEDOT:PSS on single-crystal Si (001) on sapphire (SOS) are reported. The heterostructures have larger Seebeck coefficients up to 7.3 fold and power factors up to 17.5 fold relative to PEDOT:PSS. The electrical conductivity increased with decreasing combined thicknesses of PEDOT:PSS and Si, and the Seebeck coefficient increased with decreasing PEDOT:PSS thickness, which can be attributed to modulati...

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Stress corrosion behavior of [alpha]-aluminum bronze in saline water

Corrosion, 1994

[alpha]-Aluminum bronze (Copper[Cu]-7% Al) (UNS C61400) was found to be susceptible to stress cor... more [alpha]-Aluminum bronze (Copper[Cu]-7% Al) (UNS C61400) was found to be susceptible to stress corrosion cracking (SCC) in 3.4% NaCl under relatively high anodic potentials ([&amp;gt;=] 300 mV[sub NHE]), i.e., greater than 200 mV more positive than the free-corrosion potential. The time to failure and stress ratio ([sigma] soln/[sigma] air) were mildly dependent on potential. The fracture mode changed from ductile

Sinkhole Needs Filling In

Civil Engineering Asce, Mar 1, 1990

SI-EES-Li2O2 oxidation activation published

Reversibility of Ferri-/Ferrocyanide Redox during Operando Soft X-ray Spectroscopy

The Journal of Physical Chemistry C, 2015

The MIT Faculty has made this article openly available. Please share how this access benefits you... more

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Pnas 109 (2012) 11498 Si

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