Ahmed S. Afify

Higher Institute of Engineering

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Jean‐Marc Tulliani

Polytechnic University of Turin

Mohamed Hassan

Zagazig University

M. Ataalla

Badr University in Cairo

Amr Mohamed

Taibah University

Abd El-razek Mahmoud

South Valley University

M. Milanova

Bulgarian Academy of Sciences

Ahmed Elsayed

Florida International University

Mazen Alshaaer

Prince Sattam Bin Abdulaziz University

Shady A. Ismail

Arab Academy for Science, Technology, and Maritime Transport

Ahmad S. Abu‐Khadra

Sinai University

Cooperative Institutions

Cairo University

Polytechnic University of Turin

National Research Centre

Prince Sattam Bin Abdulaziz University

Agricultural Research Center

University of Chemical Technology and Metallurgy

Al-Azhar University

National Interuniversity Consortium of Materials Science and Technology

King Abdulaziz University

Vrije Universiteit Brussel

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Evaluation of the effect of household-like handling on the concentration of ethion pesticide in parsley using GC-MS/MS for environmental monitoring

Deleted Journal (2023)

Ahmed S. Afify Shady A. Ismail Ahmed Mehrem Amr Mohamed

The main purpose of this study was to estimate the influence of different household treatments in the reduction/removal of ethion pesticide from the leaves of parsley in daily basis before human consumption. The suggested analytical method used for detection and quantitation of ethion pesticide in parsley matrix was based on AOAC Official Method 2007.01 using GC-MS/MS instrument. The limit of quantitation (LOQ) for ethion was presented as the minimum fortification level that fulfills convenient recoveries within 70–120% with precision (RSD ≤ 20%). Pesticide residues were extracted from samples of parsley leaves as a representative commodity for high water content group within leafy vegetables category. Parsley samples were gathered from Al-Rass city markets, Al-Qassim region, Saudi Arabia, and analyzed using the suggested method. Ethion pesticide was detected in parsley leaves with levels exceeding the European maximum residual limit (MRL). Some household-type processing and handling procedures were investigated in order to check their effectiveness in reducing the levels of ethion pesticide contaminant in parsley leaves before consumption. Our findings show that normal washing with tap water for 30-45 s is the best practice to reduce 29.6% the concentration of ethion pesticide in parsley samples.

Ethion

10.57241/2805-2994.1004

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Validation and measurement uncertainty of rapid and simultaneous determination of 19 elements in drinking water using ICP-MS

Accreditation and Quality Assurance (2022)

Shady A. Ismail Ahmed S. Afify

Repeatability

Certified reference materials

Traceability

Linearity

10.1007/s00769-022-01516-9

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Citations (9)

Effect of Ca2+ Replacement with Cu2+ Ions in Brushite on the Phase Composition and Crystal Structure

Minerals (2021)

Mazen Alshaaer Juma’a Al-Kafawein Ahmed S. Afify Nagat Hamad G. Saffarini

The gradual replacement of Ca2+ with Cu2+ ions in brushite (CaHPO4·2H2O) has been extensively studied and discussed. The approach adopted in this work has not been systematically explored in previous studies. This novel approach may prove beneficial for the production of Ca1−xCuxHPO4·nH2O materials with desired properties suitable for medical applications. Solutions of sodium dihydrogen orthophosphate dihydrate, NaH2PO4·2H2O, calcium nitrate tetrahydrate, Ca(NO3)2·4H2O, copper nitrate trihydrate, Cu(NO3)2·3H2O, ammonium hydroxide solution, and diluted HCl were used for the preparation of these materials. At low Cu/Ca molar ratios (up to 0.25) in the starting solution, biphasic phosphate minerals were formed: brushite and sampleite. When the Cu/Ca molar ratio increases gradually from 0.67 to 1.5, sampleite-like mineral precipitates. Powdered XRD (X-ray diffraction), thermogravimetric (TG) analysis, and SEM (scanning electron microscopy) techniques were employed for the study of the microstructure of the produced materials for different degrees of Ca replacement with Mg. It is found that the Cu/Ca ratio in the starting solution can be adjusted to obtain materials with tailored composition. Thus, a new method of sampleite-like synthesis as a rare mineral is introduced in this study. Both phosphate minerals brushite and sampleite-like minerals are attractive as precursors of bioceramics and biocements. The search for such products that may decrease the possibility of post prosthetic or implant infection can be crucial in preventing devastating post-surgical complications.

Brushite

Thermogravimetric analysis

Calcium nitrate

10.3390/min11101028

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Seminal plasma clusterin as a biomarker for spermatogenesis in patients with varicocele before and after varicocelectomy

Human Andrology (2019)

Hanan Saleh Ahmed S. Afify Walid M.A. Ahmed Maged Daruish

Introduction:A varicoc ele is an abnormally dilated pampiniform plexus of veins.Hyperthermia, oxidative stress, and elevated apoptotic index have been described in men with varicocele and infertility.Clusterin (Clu) is a chaperone-like glycoprotein that is synthesized by Sertoli cells in high concentrations and is deposited onto the membranes of mature spermatozoa, giving rise to the possibility that it has a role in sperm development.Secreted form of Clu is a powerful antiapoptotic agent.Aim: To explore Clu level in seminal plasma of infertile men with varicocele in comparison with normal healthy fertile patients and to compare the seminal plasma Clu level before and after varicocelectomy. Patients and methods:The study included 25 patients having varicocele with infertility (whether primary or secondary) for 12 months and 10 healthy volunteers of matched age and sex as control.For all the patients, sub-inguinal varicocelectomy was done.Semen analysis and seminal plasma Clu assay were carried out before and 3 months after varicocelectomy.Results: There was a statistically significant difference between patients and controls regarding sperm count, progressive motility, and seminal plasma Clu (P<0.01).Three months after varicocelectomy, the sperm count had a highly significant improvement in the patient's group (mean ± SD=17.90 ± 8.86) compared with a preoperative count (mean ± SD=11.43 ± 7.56).There was a highly significant improvement in postoperative progressive motility in the patient's group (mean ± SD=34.5 ± 20.2) compared with a preoperative progressive motility (mean ± SD=22.05 ± 15.5).Clu showed a highly significant elevation in the patient group postoperatively (mean ± SD=10.73 ± 4.5) compared with preoperatively (mean ± SD=6.68 ± 3.8). Conclusion:Based on our study, we could suggest another way of contribution of varicocele to male infertility by affecting seminal plasma Clu level.

Clusterin

10.21608/ha.2019.6681.1037

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Gradual Replacement of Ca2+ with Mg2+ Ions in Brushite for the Production of Ca1−xMgxHPO4·nH2O Materials

Minerals (2021)

Mazen Alshaaer Khalil Issa Abdulaziz A. Alanazi Saida Abu Mallouh Ahmed S. Afify

The present study investigates the gradual replacement of Ca2+ with Mg2+ ions in brushite (CaHPO4·2H2O). To date, this approach has not been systematically explored and may prove beneficial for the production of Ca1−xMgxHPO4·nH2O materials with tailored properties which are suitable for environmental and medical applications. For their production, solutions of sodium dihydrogen orthophosphate dehydrate, NaH2PO4·2H2O, calcium nitrate tetrahydrate, Ca(NO3)2·4H2O, magnesium nitrate hexahydrate, Mg(NO3)2·6H2O and ammonium hydroxide solution, NH4OH, were used. At low Mg/Ca molar ratios (up to 0.25) in the starting solution, partial replacement of Ca with Mg takes place (Mg doping) but no struvite is produced as discrete phase. When the Mg/Ca molar ratio increases gradually to 1.5, in addition to Mg-doped brushite, struvite, NH4MgPO4·6H2O, precipitates. The microstructure of the materials produced for different degrees of Ca replacement with Mg has been analyzed in depth with the use of powdered XRD (X-ray diffraction), XPS (X-ray photoelectron spectroscopy), thermogravimetric (TG) analysis and SEM (scanning electron microscopy). The results of this study prove that the Mg/Ca ratio in the starting solution can be monitored in such a way that materials with tailored composition are obtained.

Brushite

Struvite

Thermogravimetric analysis

Magnesium nitrate

Ammonium hydroxide

10.3390/min11030284

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Citations (6)

New ZnO-Based Glass Ceramic Sensor for H2 and NO2 Detection

Sensors (2017)

Mohamed Hassan Ahmed S. Afify M. Ataalla Daniel Milanese Jean‐Marc Tulliani

In this study, a glass ceramic with a nominal composition 58ZnO:4Bi₂O₃:4WO₃:33.3B₂O₃ was synthesized by melt quenching technique. A gas sensor was then manufactured using a ZnO sol-gel phase as a permanent binder of the glass-ceramic to an alumina substrate having interdigitated electrodes. The film sensitivity towards humidity, NH₃, H₂ and NO₂ was studied at different temperatures. X-ray diffraction technique (XRD), field emission- scanning electron microscopy (FE-SEM) and differential thermal analysis (DTA) were used to characterize the prepared material. Though the response in the sub-ppm NO₂ concentration range was not explored, the observed results are comparable with the latest found in the literature.

Differential thermal analysis

Glass-ceramic

10.3390/s17112538

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Citations (7)

Effect of prometryne and indole-3-acetic acid on the chemical composition of yeast protein

Food Chemistry (1994)

F. A. Ahmed S.A. El-Sayed A. E. Basyony Ahmed S. Afify

Isoleucine

Indole-3-acetic acid

10.1016/0308-8146(94)90011-6

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The crossover of (Ba1−xCax)(Ti0.9Sn0.1)O3 piezoelectric ceramics from single-phase to composite with studying the structural and dielectric properties

Journal of Materials Science Materials in Electronics (2017)

Abd El-razek Mahmoud Ahmed S. Afify Amr Mohamed

Ceramic composite

10.1007/s10854-017-6960-0

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Citations (13)

The Effect of Triton WR‐1339 on Lipid Metabolism in Mice

Fette Seifen Anstrichmittel (1986)

Ahmed M. Aboul‐Enein E. A. Abd El Rahim Ashraf M. Youssef Ahmed S. Afify

Abstract The hyperlipemia and hypercholesterolemia were induced in mice by injection (i.p.) of a single dose of Triton WR‐1339 at a dosage of 900 mg/kg body weight. These animals were characterized by significant increases in the average levels of plasma total lipids, cholesterol, phospholipids and triglycerides. The highest rise of each fraction was after 24 hr. of triton injection. Plasma total lipids and cholesterol levels were increased to 10‐fold and phospholipids to 8‐fold while triglycerides reached to 14‐fold when compared to control animals. This hyperlipemic state was associated with the appearance of fatty nodules in liver tissue. These nodules were found to be lipoproteins which were collected in bags by the liver cells. The blood glucose level was slightly elevated after triton injection while liver and muscle glycogen contents were highly increased and the highest levels were recorded after32 hr. of triton injection. Triton also reduced the activity of liver lipogenesis dehydrogenases. Maximum reduction in 6‐phosphogluconic dehydrogenase (6‐PGD) and malate dehydrogenase was found after 8 hr. of triton injection but found after 16 hr. for glucose‐6‐phosphate dehydrogenase (G‐6‐PD). After 24 and 32 hr. the enzyme activities were elevated but still below the normal levels. The mechanism of triton injection on lipid metabolism and turnover in mice was also discussed.

Lipogenesis

Malate dehydrogenase

10.1002/lipi.19860880607

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The Sensing Characteristics of ZnO Tetrapods Synthesized by Microwave Evaporation

DOAJ (DOAJ: Directory of Open Access Journals) (2018)

Ahmed S. Afify Ahmed Elsayed Ahmed S. Abu Khadra Mohamed Hassan M. Ataalla

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