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Papers by Mostafa Diab

Clinical Ophthalmology, 2020

Purpose: To evaluate outcomes of the use of electrocoagulation for epidermis removal in dermis fa... more Purpose: To evaluate outcomes of the use of electrocoagulation for epidermis removal in dermis fat grafting (DFG) compared to the conventional scalpel dissection in patients who underwent primary anophthalmic socket reconstruction. Design: Retrospective, observational, and comparative study. Methods: A retrospective review was performed on patients who underwent primary DFG for socket reconstruction between 2017 and 2019 at tertiary teaching hospitals. Patients with previous orbital surgery, previous radiotherapy to the periocular region, any medical condition that affects healing, cicatrizing ocular surface disease or heavy smokers were excluded. Patients with complete documentation of preoperative and postoperative data only were included. Patients were divided into two groups; group A: epidermis removal by the traditional scalpel dissection and group B: epidermis removal using low power setting electrocoagulation. The main outcome was the timing of complete epithelialization of the dermis layer. Other outcomes included implant motility, prosthesis fitting, patient's satisfaction, and any complications. Results: A total of 27 patients met the study criteria, and the mean follow-up period was 24.81 months. There were no differences between both groups regarding preoperative characteristics. The mean duration of complete epithelialization of the DFG implant was 9.15 ± 2.94 weeks in group A compared to 22.29 ± 4.43 weeks in group B (p value <0.001). Dermal ulceration was noticed in 9 patients (64.3%) in group B compared to none in group A (p value =0.001). Dermal ulceration was significantly associated with long conjunctival healing period (p value <0.001). Volume loss was more common in group B while graft hirsutism and granuloma were more evident in group A. Final prosthesis fitting was possible in all included patients. Conclusion: Epidermis removal using the electrocoagulation is related to much more delayed epithelialization of the dermis with a higher rate of dermal ulceration compared to the scalpel dissection technique. However, there was no significant difference between both groups regarding the final prosthesis fitting or the overall patient satisfaction.

International journal of ophthalmology, 2017

To evaluate the functional and aesthetic outcomes of upper eyelid cicatricial entropion (UCE) cor... more To evaluate the functional and aesthetic outcomes of upper eyelid cicatricial entropion (UCE) correction using anterior lamellar recession (ALR) with addressing the associated conditions including dermatochalasis, brow ptosis, blepharoptosis, and lid retraction. Chart review of patients with upper lid cicatricial entropion who had undergone ALR from 2013 to 2016 was reviewed. Success was defined as the lack of any lash in contact with the globe, no need for a second procedure, and acceptable cosmesis at the final follow up. Sixty eight patients (97 eyelids) were operated by ALR with simultaneous correction of associated lid problems in each case when necessary. The mean follow-up time was 17.8mo (range, 6.0-24.0mo). Concomitantly, levator tucking was performed in 19 eyelids (19.6%), upper lid retractor recession in 18 eyelids (18.6%), and internal browpexy in 31 eyelids (32.0%). In 95.8% of patients (95%CI: 0.85-0.96), satisfactory functional and cosmetic outcome was achieved with a...

Egyptian Journal of Chemistry, 2019

W IDESPREAD occurrence of pharmaceuticals has started to attract attention as aquatic micropollut... more W IDESPREAD occurrence of pharmaceuticals has started to attract attention as aquatic micropollutants that might have been affecting the ecological system in trace amounts. The risks associated with their introduction into wildlife habitats is becoming an important issue for both regulators and the pharmaceutical industry, because of incomplete elimination of pharmaceuticals wastewater and their metabolites. In this study there are different classes of pharmaceuticals nonsteroidal anti inflammatory (naproxen) and psychoactive drug CNS stimulants (caffeine). This work aims to remove some of pharmaceutical residues in industrial wastewater.The identification and quantification of chemical and pharmaceutical residues was explored using Gas Chromatography with Mass detector GC/MS spectrometer and the analytical method was used Environmental Protection Agency method (EPA625) determination of the concentration in industrial wastewater using liquid chromatography-based tandem mass spectrometry LC/ MS/MS spectrometer with electrospray ionization (ESI) and the analytical method was used (EPA 1694). The study recorded occurring of different types of pharmaceutical residues with different concentration levels in wastewater. The concentration levels in wastewater were detected for caffeine at 9465 ng mL-1 and for Naproxen at 2 ng mL-1 these concentrations representing about 500 fold higher than international safety margin of treated wastewater that the studies conducted in the United Kingdom, the USA and Australia have shown that concentrations of pharmaceuticals in water are typically less than 0.05 ng mL-1. Magnetic activated carbon (MAC) is proposed as a new techniqe for the adsorption of pharmaceutical residues (Caffeine and Naproxen).The isotherms as well as adsorption kinetics are explored. The results obtained high adsorption capacity of caffeine and naproxen over MAC which has reached 1.8 mg g-1 and 1.6 mg g-1 after 15 min for both caffeine and naproxen. First order model is fitted well with the experimental results through a correlation coefficient (0.978) for (caffeine) and second order model is fitted well with the experimental results through a correlation coefficient (0.9887) for (Naproxen). Moreover, the adsorption of both (caffeine and naproxen) on MAC is proceeded using freundlish isotherm model considering correlation coefficient (0.953 and 0.948) respectively. The benefits of using MAC are the low cost of synthesis and its easy and fast separation from solution by using a magnet.

Polymer complexes. XIX: Structural chemistry of poly(2-acrylamido-1,2-diaminobenzene) complexes

Bulletin de la Société Chimique de France, 1991

A new sensit4e and select4e modified screen printed electrodes (MSPEs) and carbon paste electrode... more A new sensit4e and select4e modified screen printed electrodes (MSPEs) and carbon paste electrodes (MCPEs) were studied in order to determine trimbutine maleate (TM) in pure, tablets, urine, and serum samples. These sensors were embodied with multiwalled carbon nanotubes (MWCNTs) since it improved the quality of the sensors in presence of potassium tetrakis (p-chlorophenyl) borate (KTpClPB) ionophore. A good Nernstian response for the constructed sensors, at optimum paste composition, was exhibited for determination of TM in concentration range of 1.5 × 10-7 - 1.0 × 10-2 and 1.0 × 10-7- 1.0 × 10-2 mol L-1 at 25 °C with detection limit of 1.5 × 10-7 and 1.0 × 10-7 mol L-1 for MCPE and MSPE, respect4ely. It seemed that the potential of the electrodes was independent on pH in the range of 2.0-8.0, 2.0-8.5, 2.0-8.5, and 2.0-9.0 g4ing slope as 56.77 ± 1.11, 57.82 ± 0.54, 57.95 ± 0.37, and 58.99 ± 0.28 mV decade-1 for electrodes 1, 2, 3 and 4, respect4ely. MCPEs and MSPEs gave response ti...

Polymers, 2021

Semiconductor materials based on metal high crosslinked-vinyl polymer composites were prepared th... more Semiconductor materials based on metal high crosslinked-vinyl polymer composites were prepared through loading of Pd(OAc)2 on both Poly(ethylene-1,2-diyl dimethacrylate) (poly(EDMA)) and poly(ethylene-1,2-diyl dimethacrylate-co-methyl methacrylate) (Poly(EDMA-co-MMA)). The thermochemical properties for both poly(EDMA) and poly(EDMA-co-MMA) were investigated by thermal gravimetric analysis TGA technique. The dielectric permittivity, AC electrical conductivity and conduction mechanism for all the prepared polymers and their Pd(OAc)2 composites were studied. The results showed that the loading of polymers with Pd(OAc)2 led to an increase in the magnitudes of both the dielectric permittivity and AC electrical conductivity (σac). The value of σac increased from 1.38 × 10−5 to 5.84 × 10−5 S m−1 and from 6.40 × 10−6 to 2.48 × 10−5 S m−1 for poly(EDMA) and poly(EDMA-co-MMA), respectively, at 1 MHz and 340 K after loading with Pd(OAc)2. Additionally, all the prepared polymers and composites ...

Open Academic Journal of Advanced Science and Technology, 2020

The electrochemical behavior of nickel chloride in citric acid aqueous solution (0.1M) in the pre... more The electrochemical behavior of nickel chloride in citric acid aqueous solution (0.1M) in the presence of potassium ferrioxalate K3Fe(Oxalate)3 (KFOx) as moderator sensor and by the use of gold working electrode (GWE) was studied. Since nickel ions do not show any peaks in acidic media, but after adding potassium ferrioxalate K3Fe(Oxalate)3 (KFOx) as a sensor, two redox peaks of nickel ions were obtained. (KFOx) sensor indicating the appearance of nickel ion peaks. Two redox couples of waves were obtained attributed to [Ni(II)-Ox-Fe(III)]/[Ni(III)-Ox-Fe(III)]and[Ni(II)-Ox-Fe(III)] /[Ni(II)-Ox-Fe(II)]. The cyclic voltammetry for NiCl2 and its interaction with diphenylthiocarbazone, dithizone was studies at three different temperatures, 293.15, 303.15 and 313.15K. Different thermodynamic and kinetic parameters of interaction of nickel ions with dithizone were evaluated from the cyclic voltammograms. The estimated cyclic voltammetry values were discussed. Molecular docking was carried out to predict the binding between diphenylthiocabazone, dithizone ligand with the receptor of human liver cancer (3cmf). We can propose that interaction between the 3cmf receptors and the ligand is possible.

Egyptian Journal of Chemistry, 2019

P HARMACEUTICALS are classified as emerging environmental pollutants that have a potential harmfu... more P HARMACEUTICALS are classified as emerging environmental pollutants that have a potential harmful impact on environment and human health. This study aims to treat the tramadol hydrochloride (TH) in different water resources in Egypt. The identification and quantification of TH was explored using LC/MS/MS instrument. The study proposed kaolinite/ZnO nanocomposite (K/ZnO) as a new solution for TH treatment. The characterization study showed that the highest photodegradation activity was achieved in the case of K/ZnO40%. The photodegradation kinetics and thermodynamics are investigated. The obtained results reveal that Pseudo-first order model is well fitted with a correlation coefficient (0.990). Moreover, the positive values of ΔH˚ and ΔS˚ show that the photodegradation process is an endothermic reaction. Positive value of free energy indicates that the adsorption process is not spontaneous.

Egyptian Journal of Chemistry, 2019

2 ,4-Dichlorophenoxyacetic acid (2,4-D), is one of the most commonly herbicides used in agricultu... more 2 ,4-Dichlorophenoxyacetic acid (2,4-D), is one of the most commonly herbicides used in agricultural farms to control weeds. Accumulation of 2,4-D in natural water stream constitutes a serious issue because of the adverse effects on human and animal health. This study aimed to monitor and treat 2,4-D in different water resources in Egypt. Treatment obtained by zinc ferrite nanoparticles (ZnFe 2 O 4) which prepared by sol-gel combustion method. The batch experiments were carried out to study the optimum removal conditions such as pH, dose, 2,4-D initial concentration, contact time, ionic strength and temperature. Results recorded tentatively the presence of 2,4-D in the Rosita River Nile and agriculture drainage channels with concentrations ranged from 0.35 to 21.31 μg L-1 using LC/MS/MS analyzer. The optimization study showed a maximum percent of removal is 97.84% for adsorption followed by photodegradation using 0.3 g of zinc ferrite nanoparticles for 15 min. at pH 8.0. Adsorption capacity was 0.34 mg/g at initial concentration (C o) 10 mg/L after 15 min. Pseudo-second order model is well fitted with the experimental data with a correlation coefficient 0.999. Adsorption is proceeded with Freundlich isotherm model with correlation coefficient 0.986. According to the study findings zinc ferrite nanoparticle was considered as a new novel solution for removing that hazard material.

Applied Organometallic Chemistry, 2018

Co(II) complexes (1-4) were prepared and characterized by elemental analyses, infrared spectra, s... more Co(II) complexes (1-4) were prepared and characterized by elemental analyses, infrared spectra, spectral studies, magnetic susceptibility measurements, X-ray diffraction analysis and thermogravimetric analysis (TGA). The X-ray diffraction patterns of Co(II) complexes were observed many peaks which indicate the polycrystalline nature. The thermodynamic parameters were calculated by using Coats-Redfern and Horowitz-Metzger methods. The bond length, bond angle and quantum chemical parameters of the Co(II) complexes were studied and discussed. The Co(II) complexes were tested against various Gram-positive bacteria, Gram-negative bacteria and fungi. It was found that the Co(II) complex (1) has more antifungal activity than miconazole (antifungal standard drug) against P. italicum at all concentration. The Co(II) complex (2) has more antibacterial activity than the penicillin against K. pneumoniae at all concentration. The interaction between Co(II) complexes and calf thymus DNA show hypochromism effect. The relationship between the values of HOMO-LUMO energy gap (ΔE) and the values of intrinsic binding constant (K b) is revealed increasing of HOMO-LUMO energy gap accompanied by the decrease of K b .

Polymer complex LXIV: Coordination chemistry of some rhodanine polymer complexes

Journal of Molecular Liquids, 2016

Abstract This review will focus on the synthesis and characterization of some polymers and polyme... more Abstract This review will focus on the synthesis and characterization of some polymers and polymeric complexes containing rhodanine as a moiety then, given light on its characterization. The force constant F M–O (10 −8 N/Ǻ) and the bond length R M–O (Ǻ) of the M–O bond were calculated from the IR data and related to the electronic properties of the substituents. ESR spectral data provided information about their structure on the basis of Hamiltonian parameters and degree of covalency. The polyrhodanine was applied to remove heavy metal ions from aqueous solution because polyrhodanine could be coordinated with specific metal ions. Adsorption isotherms of heavy metals on the polyrhodanine were analyzed with Langmuir and Freundlich isotherm models. The kinetic data of adsorption of heavy metal ions on the synthesized polyrhodanine adsorbents were described.

Journal of Molecular Liquids, 2016

Allyl-5-(4-aryldiazenyl)-2-thioxothiazolidin-4-one (HL n) were produced from coupling reaction be... more Allyl-5-(4-aryldiazenyl)-2-thioxothiazolidin-4-one (HL n) were produced from coupling reaction between Nallylrhodanine and p-aniline derivatives and confirmed by various physico-chemical techniques. The molecular structures of the ligands (HL n) were optimized theoretically and the quantum chemical parameters were calculated. Molecular docking was used to predict the efficiency of binding between each ligand and hormone receptors. The receptor 3hb5-Oxidoreductase showed best interaction with ligands compared to 2q7k hormone. The acid dissociation constants (pK H) of ligands have been determined potentiometrically at different temperatures. The stability constants (log K) of some transition metal ions (Mn 2+ , Co 2+ , Ni 2+ and Cu 2+) with the investigated ligands have been determined. The thermodynamic parameters (ΔG, ΔH and ΔS) were derived and discussed at different temperatures. The formation of the metal complexes was found to be spontaneous, endothermic and entropically favorable. The relationships between the stability constants and ΔG values of all investigated complexes and their ionic radii have been discussed and correlated.

Journal of Molecular Liquids, 2016

A series of 5-(4′-alkylphenylazo)-3-phenylamino-2-thioxothiazolidin-4-one (HL n) have been prepar... more A series of 5-(4′-alkylphenylazo)-3-phenylamino-2-thioxothiazolidin-4-one (HL n) have been prepared and characterized by elemental analysis, 1 H NMR and IR spectra. X-ray diffraction pattern of ligand (HL 2) was studied. The geometrical structures of these ligands are carried out by HF method with 3-21G basis set. Proton-ligand dissociation constant of ligands (HL n) and their metal-ligand stability constants of Mn 2+ , Co 2+ , Ni 2+ and Cu 2+ have been determined potentiometrically in 0.1 M KCl and 30% (v/v) DMSO-water mixture at 298, 308 and 318 K. The stability constants of the formed complexes increase with the order: Mn 2+ b Co 2+ b Ni 2+ b Cu 2+. The effect of temperature was studied and the corresponding thermodynamic parameters (ΔG, ΔH and ΔS) were derived and discussed. The dissociation process is non-spontaneous, endothermic and entropically unfavorable. The formation of the metal complexes has been found to be spontaneous, endothermic and entropically favorable. Proton-ligand dissociation constant (pK H) of the ligands increases according to the following order p-(OCH 3 N H N NO 2) as expected from Hammett's constant (σ R).

Conducting Polymers .VII. Effect of doping with iodine on the dielectrical and electrical conduction properties of polyaniline

Synthesis and Reactivity in Inorganic, Metal-Organic, and Nano-Metal Chemistry, 2015

The oxidative chemical polymerization of aniline monomer in acidic aqueous media by using potassi... more The oxidative chemical polymerization of aniline monomer in acidic aqueous media by using potassium dichromate as unconventional initiator was carried out at room temperature based on two different comparative methods. In the first method, in situ polymerization of polyaniline, polymerization was carried out in the presence of iodine solution (PANI/I2-In). In the second method, ex situ polymerization, after complete polymerization polyaniline was doped with iodine (PANI/I2-Ex). FTIR, UV measurements, and TGA analysis for undoped polyaniline (PANI), iodine doped polyaniline (PANI/I2-Ex), and iodine doped polyaniline (PANI/I2-In) show that iodine doping process occurred at the quinoid units in the polyaniline backbone of (PANI/I2-Ex) while iodine doping occurred at benzenoid units in polyaniline, in addition the iodination occurred at the rings of polyaniline backbone of (PANI/I2-In.). The data extracted from the XRD patterns shows the crystalline nature of synthesized samples and particles sizes are in the range 37–42 nm. The activation energies of thermal degradation of polyaniline or iodine doped polyaniline were determined from the TGA thermogram for PANI, (PANI/I2-In), and (PANI/I2-Ex) are 24.1, 43.4, and 44.19 KJ/mol, respectively. Doping of PANI with iodine enhances the ac conductivity of PANI whatever the method of doping, The room temperature values of σac measured under test frequency 100 kHz are found to be 6×10−5, 2.5×10−4, and 1×10−3 Ω−1.m−1 for PANI, (PANI/I2-In), and (PANI/I2-Ex), respectively.

Polymeric complexes — LXII. Coordination chemistry of supramolecular Schiff base polymer complexes — A review

Journal of Molecular Liquids, 2016

Abstract This review gives an account of the coordination chemistry of supramolecular Schiff base... more Abstract This review gives an account of the coordination chemistry of supramolecular Schiff base polymer complexes. The synthesis and structures of Schiff base monomers and their polymer complexes were described. Spectral techniques like (IR, 1H-NMR) and thermal analysis were investigated. ESR spectral data provided information about their structure on the basis Hamiltonian parameters and degree of covalency. The ESR data in connection with the structures and the nature of the bonding in these polymer complexes were investigated. This kind of investigation is fundamentally important to the structural estimation of various metallo-enzymes. The thermal stability was investigated using thermogravimetric analysis. The results showed that the Schiff base polymer complexes are mostly more stable than the homopolymer. The corrosion inhibition efficiency in absence and presence of ligands of aluminium in HCl was studied. The antimicrobial activity of all metal complexes compounds has also been demonstrated.

Polymer-Plastics Technology and Engineering, 2015

Factorization of the incompressible Stokes operator linking pressure and velocity is revisited. T... more Factorization of the incompressible Stokes operator linking pressure and velocity is revisited. The main purpose is to use the inverse of the Stokes operator with a large time step as a preconditioner for Newton and Arnoldi iterations applied to computation of steady threedimensional flows and to study of their stability. It is shown that the Stokes operator can be inversed within an acceptable computational effort. This inverse includes fast direct inverses of several Helmholtz operators and iterative inverse of the pressure matrix. It is shown, additionally, that fast direct solvers can be attractive for the inverse of the Helmholtz and Laplace operators on fine grids and at large Reynolds numbers, as well as for other problems where convergence of iterative methods slows down. Implementation of the Stokes operator inverse to time-stepping-based formulation of the Newton and Arnoldi iterations is discussed.

Materials Research Bulletin, 2015

A novel series of Cu(II) complexes of azo rhodanine derivatives [CuL n (OAc)(OH 2)]2H 2 O (n = 1,... more A novel series of Cu(II) complexes of azo rhodanine derivatives [CuL n (OAc)(OH 2)]2H 2 O (n = 1, R = OCH 3 ; n = 2, CH 3 ; n = 3, H; and n = 4, NO 2) have been synthesized. The alternating current conductivity (s ac) and dielectric properties of Cu(II) complexes of azo rhodanine derivatives were investigated in the frequency range 0.1-100 kHz and temperature range 303-600 K. The values of the thermal activation energies of electrical conductivity DE 1 and DE 2 for all Cu(II) complexes [CuL n (OAc)(OH 2)]2H 2 O were calculated at different frequencies. The conductivity depends on the substituents of the complexes. The correlated barrier hopping (CBH) is the dominant conduction mechanism for complexes [CuL n (OAc)(OH 2)]2H 2 O (n = 1, 2 and 4) while for complex [CuL 3 (OAc)(OH 2)]2H 2 O the small polarons tunneling (SPT) is the dominant conduction mechanism.

Polymer complexes: XXIV. Physico-chemical studies on coordination and stability in relation to IR data for poly(cinnamaldehyde-anthranilic acid) complexes of d-block elements

Polymer Degradation and Stability, 1993

A new homopolymer derived from cinnamaldehyde and 2-substituted aniline and its Cu(II), Ni(II), C... more A new homopolymer derived from cinnamaldehyde and 2-substituted aniline and its Cu(II), Ni(II), Co(II), Zn(II), Cd(II) and Hg(II) complexes has been synthesized and characterized by elemental analysis, IR, electronic spectral, EPR, TG, 1 H-and 13 C-NMR and magnetic susceptibility ...

Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy, 2014

h i g h l i g h t s We use (PAN/AC) composite as adsorbent for the removal of textile dyes. XRD a... more h i g h l i g h t s We use (PAN/AC) composite as adsorbent for the removal of textile dyes. XRD and FRIR studies have been carried out for characterization of the composite. Langmuir and Freundlich isotherms have been used to find out the best fit model. Kinetic and thermodynamic studies of the surfactant adsorption have been investigated. Results are of marked significance to the water treatment industries. g r a p h i c a l a b s t r a c t Effect of initial dye concentration on adsorption of AR57 on to (PAN/AC) composite at dye concentration 60 mg/L, pH 1 and 25°C.

Polymer complexes. XLXI. Supramolecular spectral studies on metal–ligand bonding of novel rhodanine sulphadrugs hydrazone

Materials Chemistry and Physics, 2010

Novel polymeric complexes with 5-sulphadiazineazo-3-phenyl-2-thioxo-4-thiazolidine (HL1), 5-sulph... more Novel polymeric complexes with 5-sulphadiazineazo-3-phenyl-2-thioxo-4-thiazolidine (HL1), 5-sulphamethazineazo-3-phenyl-2-thioxo-4-thiazolidine (HL2) and 5-sulphamethoxazoleazo-3-phenyl-2-thioxo-4-thiazolidine (HL3) and various anions were prepared. Structural and spectroscopic properties have been studied on the basis of elemental analyses, infrared spectra, 1HNMR spectra, electronic spectra, magnetic measurements and ESR. IR and 1H NMR studies reveal that the ligands (HLn) exists in the tautomeric enol/hydrazo form in both states with intramolecular

Clinical Ophthalmology, 2020

Purpose: To evaluate outcomes of the use of electrocoagulation for epidermis removal in dermis fa... more Purpose: To evaluate outcomes of the use of electrocoagulation for epidermis removal in dermis fat grafting (DFG) compared to the conventional scalpel dissection in patients who underwent primary anophthalmic socket reconstruction. Design: Retrospective, observational, and comparative study. Methods: A retrospective review was performed on patients who underwent primary DFG for socket reconstruction between 2017 and 2019 at tertiary teaching hospitals. Patients with previous orbital surgery, previous radiotherapy to the periocular region, any medical condition that affects healing, cicatrizing ocular surface disease or heavy smokers were excluded. Patients with complete documentation of preoperative and postoperative data only were included. Patients were divided into two groups; group A: epidermis removal by the traditional scalpel dissection and group B: epidermis removal using low power setting electrocoagulation. The main outcome was the timing of complete epithelialization of the dermis layer. Other outcomes included implant motility, prosthesis fitting, patient's satisfaction, and any complications. Results: A total of 27 patients met the study criteria, and the mean follow-up period was 24.81 months. There were no differences between both groups regarding preoperative characteristics. The mean duration of complete epithelialization of the DFG implant was 9.15 ± 2.94 weeks in group A compared to 22.29 ± 4.43 weeks in group B (p value <0.001). Dermal ulceration was noticed in 9 patients (64.3%) in group B compared to none in group A (p value =0.001). Dermal ulceration was significantly associated with long conjunctival healing period (p value <0.001). Volume loss was more common in group B while graft hirsutism and granuloma were more evident in group A. Final prosthesis fitting was possible in all included patients. Conclusion: Epidermis removal using the electrocoagulation is related to much more delayed epithelialization of the dermis with a higher rate of dermal ulceration compared to the scalpel dissection technique. However, there was no significant difference between both groups regarding the final prosthesis fitting or the overall patient satisfaction.

International journal of ophthalmology, 2017

To evaluate the functional and aesthetic outcomes of upper eyelid cicatricial entropion (UCE) cor... more To evaluate the functional and aesthetic outcomes of upper eyelid cicatricial entropion (UCE) correction using anterior lamellar recession (ALR) with addressing the associated conditions including dermatochalasis, brow ptosis, blepharoptosis, and lid retraction. Chart review of patients with upper lid cicatricial entropion who had undergone ALR from 2013 to 2016 was reviewed. Success was defined as the lack of any lash in contact with the globe, no need for a second procedure, and acceptable cosmesis at the final follow up. Sixty eight patients (97 eyelids) were operated by ALR with simultaneous correction of associated lid problems in each case when necessary. The mean follow-up time was 17.8mo (range, 6.0-24.0mo). Concomitantly, levator tucking was performed in 19 eyelids (19.6%), upper lid retractor recession in 18 eyelids (18.6%), and internal browpexy in 31 eyelids (32.0%). In 95.8% of patients (95%CI: 0.85-0.96), satisfactory functional and cosmetic outcome was achieved with a...

Egyptian Journal of Chemistry, 2019

W IDESPREAD occurrence of pharmaceuticals has started to attract attention as aquatic micropollut... more W IDESPREAD occurrence of pharmaceuticals has started to attract attention as aquatic micropollutants that might have been affecting the ecological system in trace amounts. The risks associated with their introduction into wildlife habitats is becoming an important issue for both regulators and the pharmaceutical industry, because of incomplete elimination of pharmaceuticals wastewater and their metabolites. In this study there are different classes of pharmaceuticals nonsteroidal anti inflammatory (naproxen) and psychoactive drug CNS stimulants (caffeine). This work aims to remove some of pharmaceutical residues in industrial wastewater.The identification and quantification of chemical and pharmaceutical residues was explored using Gas Chromatography with Mass detector GC/MS spectrometer and the analytical method was used Environmental Protection Agency method (EPA625) determination of the concentration in industrial wastewater using liquid chromatography-based tandem mass spectrometry LC/ MS/MS spectrometer with electrospray ionization (ESI) and the analytical method was used (EPA 1694). The study recorded occurring of different types of pharmaceutical residues with different concentration levels in wastewater. The concentration levels in wastewater were detected for caffeine at 9465 ng mL-1 and for Naproxen at 2 ng mL-1 these concentrations representing about 500 fold higher than international safety margin of treated wastewater that the studies conducted in the United Kingdom, the USA and Australia have shown that concentrations of pharmaceuticals in water are typically less than 0.05 ng mL-1. Magnetic activated carbon (MAC) is proposed as a new techniqe for the adsorption of pharmaceutical residues (Caffeine and Naproxen).The isotherms as well as adsorption kinetics are explored. The results obtained high adsorption capacity of caffeine and naproxen over MAC which has reached 1.8 mg g-1 and 1.6 mg g-1 after 15 min for both caffeine and naproxen. First order model is fitted well with the experimental results through a correlation coefficient (0.978) for (caffeine) and second order model is fitted well with the experimental results through a correlation coefficient (0.9887) for (Naproxen). Moreover, the adsorption of both (caffeine and naproxen) on MAC is proceeded using freundlish isotherm model considering correlation coefficient (0.953 and 0.948) respectively. The benefits of using MAC are the low cost of synthesis and its easy and fast separation from solution by using a magnet.

Polymer complexes. XIX: Structural chemistry of poly(2-acrylamido-1,2-diaminobenzene) complexes

Bulletin de la Société Chimique de France, 1991

A new sensit4e and select4e modified screen printed electrodes (MSPEs) and carbon paste electrode... more A new sensit4e and select4e modified screen printed electrodes (MSPEs) and carbon paste electrodes (MCPEs) were studied in order to determine trimbutine maleate (TM) in pure, tablets, urine, and serum samples. These sensors were embodied with multiwalled carbon nanotubes (MWCNTs) since it improved the quality of the sensors in presence of potassium tetrakis (p-chlorophenyl) borate (KTpClPB) ionophore. A good Nernstian response for the constructed sensors, at optimum paste composition, was exhibited for determination of TM in concentration range of 1.5 × 10-7 - 1.0 × 10-2 and 1.0 × 10-7- 1.0 × 10-2 mol L-1 at 25 °C with detection limit of 1.5 × 10-7 and 1.0 × 10-7 mol L-1 for MCPE and MSPE, respect4ely. It seemed that the potential of the electrodes was independent on pH in the range of 2.0-8.0, 2.0-8.5, 2.0-8.5, and 2.0-9.0 g4ing slope as 56.77 ± 1.11, 57.82 ± 0.54, 57.95 ± 0.37, and 58.99 ± 0.28 mV decade-1 for electrodes 1, 2, 3 and 4, respect4ely. MCPEs and MSPEs gave response ti...

Polymers, 2021

Semiconductor materials based on metal high crosslinked-vinyl polymer composites were prepared th... more Semiconductor materials based on metal high crosslinked-vinyl polymer composites were prepared through loading of Pd(OAc)2 on both Poly(ethylene-1,2-diyl dimethacrylate) (poly(EDMA)) and poly(ethylene-1,2-diyl dimethacrylate-co-methyl methacrylate) (Poly(EDMA-co-MMA)). The thermochemical properties for both poly(EDMA) and poly(EDMA-co-MMA) were investigated by thermal gravimetric analysis TGA technique. The dielectric permittivity, AC electrical conductivity and conduction mechanism for all the prepared polymers and their Pd(OAc)2 composites were studied. The results showed that the loading of polymers with Pd(OAc)2 led to an increase in the magnitudes of both the dielectric permittivity and AC electrical conductivity (σac). The value of σac increased from 1.38 × 10−5 to 5.84 × 10−5 S m−1 and from 6.40 × 10−6 to 2.48 × 10−5 S m−1 for poly(EDMA) and poly(EDMA-co-MMA), respectively, at 1 MHz and 340 K after loading with Pd(OAc)2. Additionally, all the prepared polymers and composites ...

Open Academic Journal of Advanced Science and Technology, 2020

The electrochemical behavior of nickel chloride in citric acid aqueous solution (0.1M) in the pre... more The electrochemical behavior of nickel chloride in citric acid aqueous solution (0.1M) in the presence of potassium ferrioxalate K3Fe(Oxalate)3 (KFOx) as moderator sensor and by the use of gold working electrode (GWE) was studied. Since nickel ions do not show any peaks in acidic media, but after adding potassium ferrioxalate K3Fe(Oxalate)3 (KFOx) as a sensor, two redox peaks of nickel ions were obtained. (KFOx) sensor indicating the appearance of nickel ion peaks. Two redox couples of waves were obtained attributed to [Ni(II)-Ox-Fe(III)]/[Ni(III)-Ox-Fe(III)]and[Ni(II)-Ox-Fe(III)] /[Ni(II)-Ox-Fe(II)]. The cyclic voltammetry for NiCl2 and its interaction with diphenylthiocarbazone, dithizone was studies at three different temperatures, 293.15, 303.15 and 313.15K. Different thermodynamic and kinetic parameters of interaction of nickel ions with dithizone were evaluated from the cyclic voltammograms. The estimated cyclic voltammetry values were discussed. Molecular docking was carried out to predict the binding between diphenylthiocabazone, dithizone ligand with the receptor of human liver cancer (3cmf). We can propose that interaction between the 3cmf receptors and the ligand is possible.

Egyptian Journal of Chemistry, 2019

P HARMACEUTICALS are classified as emerging environmental pollutants that have a potential harmfu... more P HARMACEUTICALS are classified as emerging environmental pollutants that have a potential harmful impact on environment and human health. This study aims to treat the tramadol hydrochloride (TH) in different water resources in Egypt. The identification and quantification of TH was explored using LC/MS/MS instrument. The study proposed kaolinite/ZnO nanocomposite (K/ZnO) as a new solution for TH treatment. The characterization study showed that the highest photodegradation activity was achieved in the case of K/ZnO40%. The photodegradation kinetics and thermodynamics are investigated. The obtained results reveal that Pseudo-first order model is well fitted with a correlation coefficient (0.990). Moreover, the positive values of ΔH˚ and ΔS˚ show that the photodegradation process is an endothermic reaction. Positive value of free energy indicates that the adsorption process is not spontaneous.

Egyptian Journal of Chemistry, 2019

2 ,4-Dichlorophenoxyacetic acid (2,4-D), is one of the most commonly herbicides used in agricultu... more 2 ,4-Dichlorophenoxyacetic acid (2,4-D), is one of the most commonly herbicides used in agricultural farms to control weeds. Accumulation of 2,4-D in natural water stream constitutes a serious issue because of the adverse effects on human and animal health. This study aimed to monitor and treat 2,4-D in different water resources in Egypt. Treatment obtained by zinc ferrite nanoparticles (ZnFe 2 O 4) which prepared by sol-gel combustion method. The batch experiments were carried out to study the optimum removal conditions such as pH, dose, 2,4-D initial concentration, contact time, ionic strength and temperature. Results recorded tentatively the presence of 2,4-D in the Rosita River Nile and agriculture drainage channels with concentrations ranged from 0.35 to 21.31 μg L-1 using LC/MS/MS analyzer. The optimization study showed a maximum percent of removal is 97.84% for adsorption followed by photodegradation using 0.3 g of zinc ferrite nanoparticles for 15 min. at pH 8.0. Adsorption capacity was 0.34 mg/g at initial concentration (C o) 10 mg/L after 15 min. Pseudo-second order model is well fitted with the experimental data with a correlation coefficient 0.999. Adsorption is proceeded with Freundlich isotherm model with correlation coefficient 0.986. According to the study findings zinc ferrite nanoparticle was considered as a new novel solution for removing that hazard material.

Applied Organometallic Chemistry, 2018

Co(II) complexes (1-4) were prepared and characterized by elemental analyses, infrared spectra, s... more Co(II) complexes (1-4) were prepared and characterized by elemental analyses, infrared spectra, spectral studies, magnetic susceptibility measurements, X-ray diffraction analysis and thermogravimetric analysis (TGA). The X-ray diffraction patterns of Co(II) complexes were observed many peaks which indicate the polycrystalline nature. The thermodynamic parameters were calculated by using Coats-Redfern and Horowitz-Metzger methods. The bond length, bond angle and quantum chemical parameters of the Co(II) complexes were studied and discussed. The Co(II) complexes were tested against various Gram-positive bacteria, Gram-negative bacteria and fungi. It was found that the Co(II) complex (1) has more antifungal activity than miconazole (antifungal standard drug) against P. italicum at all concentration. The Co(II) complex (2) has more antibacterial activity than the penicillin against K. pneumoniae at all concentration. The interaction between Co(II) complexes and calf thymus DNA show hypochromism effect. The relationship between the values of HOMO-LUMO energy gap (ΔE) and the values of intrinsic binding constant (K b) is revealed increasing of HOMO-LUMO energy gap accompanied by the decrease of K b .

Polymer complex LXIV: Coordination chemistry of some rhodanine polymer complexes

Journal of Molecular Liquids, 2016

Abstract This review will focus on the synthesis and characterization of some polymers and polyme... more Abstract This review will focus on the synthesis and characterization of some polymers and polymeric complexes containing rhodanine as a moiety then, given light on its characterization. The force constant F M–O (10 −8 N/Ǻ) and the bond length R M–O (Ǻ) of the M–O bond were calculated from the IR data and related to the electronic properties of the substituents. ESR spectral data provided information about their structure on the basis of Hamiltonian parameters and degree of covalency. The polyrhodanine was applied to remove heavy metal ions from aqueous solution because polyrhodanine could be coordinated with specific metal ions. Adsorption isotherms of heavy metals on the polyrhodanine were analyzed with Langmuir and Freundlich isotherm models. The kinetic data of adsorption of heavy metal ions on the synthesized polyrhodanine adsorbents were described.

Journal of Molecular Liquids, 2016

Allyl-5-(4-aryldiazenyl)-2-thioxothiazolidin-4-one (HL n) were produced from coupling reaction be... more Allyl-5-(4-aryldiazenyl)-2-thioxothiazolidin-4-one (HL n) were produced from coupling reaction between Nallylrhodanine and p-aniline derivatives and confirmed by various physico-chemical techniques. The molecular structures of the ligands (HL n) were optimized theoretically and the quantum chemical parameters were calculated. Molecular docking was used to predict the efficiency of binding between each ligand and hormone receptors. The receptor 3hb5-Oxidoreductase showed best interaction with ligands compared to 2q7k hormone. The acid dissociation constants (pK H) of ligands have been determined potentiometrically at different temperatures. The stability constants (log K) of some transition metal ions (Mn 2+ , Co 2+ , Ni 2+ and Cu 2+) with the investigated ligands have been determined. The thermodynamic parameters (ΔG, ΔH and ΔS) were derived and discussed at different temperatures. The formation of the metal complexes was found to be spontaneous, endothermic and entropically favorable. The relationships between the stability constants and ΔG values of all investigated complexes and their ionic radii have been discussed and correlated.

Journal of Molecular Liquids, 2016

A series of 5-(4′-alkylphenylazo)-3-phenylamino-2-thioxothiazolidin-4-one (HL n) have been prepar... more A series of 5-(4′-alkylphenylazo)-3-phenylamino-2-thioxothiazolidin-4-one (HL n) have been prepared and characterized by elemental analysis, 1 H NMR and IR spectra. X-ray diffraction pattern of ligand (HL 2) was studied. The geometrical structures of these ligands are carried out by HF method with 3-21G basis set. Proton-ligand dissociation constant of ligands (HL n) and their metal-ligand stability constants of Mn 2+ , Co 2+ , Ni 2+ and Cu 2+ have been determined potentiometrically in 0.1 M KCl and 30% (v/v) DMSO-water mixture at 298, 308 and 318 K. The stability constants of the formed complexes increase with the order: Mn 2+ b Co 2+ b Ni 2+ b Cu 2+. The effect of temperature was studied and the corresponding thermodynamic parameters (ΔG, ΔH and ΔS) were derived and discussed. The dissociation process is non-spontaneous, endothermic and entropically unfavorable. The formation of the metal complexes has been found to be spontaneous, endothermic and entropically favorable. Proton-ligand dissociation constant (pK H) of the ligands increases according to the following order p-(OCH 3 N H N NO 2) as expected from Hammett's constant (σ R).

Conducting Polymers .VII. Effect of doping with iodine on the dielectrical and electrical conduction properties of polyaniline

Synthesis and Reactivity in Inorganic, Metal-Organic, and Nano-Metal Chemistry, 2015

The oxidative chemical polymerization of aniline monomer in acidic aqueous media by using potassi... more The oxidative chemical polymerization of aniline monomer in acidic aqueous media by using potassium dichromate as unconventional initiator was carried out at room temperature based on two different comparative methods. In the first method, in situ polymerization of polyaniline, polymerization was carried out in the presence of iodine solution (PANI/I2-In). In the second method, ex situ polymerization, after complete polymerization polyaniline was doped with iodine (PANI/I2-Ex). FTIR, UV measurements, and TGA analysis for undoped polyaniline (PANI), iodine doped polyaniline (PANI/I2-Ex), and iodine doped polyaniline (PANI/I2-In) show that iodine doping process occurred at the quinoid units in the polyaniline backbone of (PANI/I2-Ex) while iodine doping occurred at benzenoid units in polyaniline, in addition the iodination occurred at the rings of polyaniline backbone of (PANI/I2-In.). The data extracted from the XRD patterns shows the crystalline nature of synthesized samples and particles sizes are in the range 37–42 nm. The activation energies of thermal degradation of polyaniline or iodine doped polyaniline were determined from the TGA thermogram for PANI, (PANI/I2-In), and (PANI/I2-Ex) are 24.1, 43.4, and 44.19 KJ/mol, respectively. Doping of PANI with iodine enhances the ac conductivity of PANI whatever the method of doping, The room temperature values of σac measured under test frequency 100 kHz are found to be 6×10−5, 2.5×10−4, and 1×10−3 Ω−1.m−1 for PANI, (PANI/I2-In), and (PANI/I2-Ex), respectively.

Polymeric complexes — LXII. Coordination chemistry of supramolecular Schiff base polymer complexes — A review

Journal of Molecular Liquids, 2016

Abstract This review gives an account of the coordination chemistry of supramolecular Schiff base... more Abstract This review gives an account of the coordination chemistry of supramolecular Schiff base polymer complexes. The synthesis and structures of Schiff base monomers and their polymer complexes were described. Spectral techniques like (IR, 1H-NMR) and thermal analysis were investigated. ESR spectral data provided information about their structure on the basis Hamiltonian parameters and degree of covalency. The ESR data in connection with the structures and the nature of the bonding in these polymer complexes were investigated. This kind of investigation is fundamentally important to the structural estimation of various metallo-enzymes. The thermal stability was investigated using thermogravimetric analysis. The results showed that the Schiff base polymer complexes are mostly more stable than the homopolymer. The corrosion inhibition efficiency in absence and presence of ligands of aluminium in HCl was studied. The antimicrobial activity of all metal complexes compounds has also been demonstrated.

Polymer-Plastics Technology and Engineering, 2015

Factorization of the incompressible Stokes operator linking pressure and velocity is revisited. T... more Factorization of the incompressible Stokes operator linking pressure and velocity is revisited. The main purpose is to use the inverse of the Stokes operator with a large time step as a preconditioner for Newton and Arnoldi iterations applied to computation of steady threedimensional flows and to study of their stability. It is shown that the Stokes operator can be inversed within an acceptable computational effort. This inverse includes fast direct inverses of several Helmholtz operators and iterative inverse of the pressure matrix. It is shown, additionally, that fast direct solvers can be attractive for the inverse of the Helmholtz and Laplace operators on fine grids and at large Reynolds numbers, as well as for other problems where convergence of iterative methods slows down. Implementation of the Stokes operator inverse to time-stepping-based formulation of the Newton and Arnoldi iterations is discussed.

Materials Research Bulletin, 2015

A novel series of Cu(II) complexes of azo rhodanine derivatives [CuL n (OAc)(OH 2)]2H 2 O (n = 1,... more A novel series of Cu(II) complexes of azo rhodanine derivatives [CuL n (OAc)(OH 2)]2H 2 O (n = 1, R = OCH 3 ; n = 2, CH 3 ; n = 3, H; and n = 4, NO 2) have been synthesized. The alternating current conductivity (s ac) and dielectric properties of Cu(II) complexes of azo rhodanine derivatives were investigated in the frequency range 0.1-100 kHz and temperature range 303-600 K. The values of the thermal activation energies of electrical conductivity DE 1 and DE 2 for all Cu(II) complexes [CuL n (OAc)(OH 2)]2H 2 O were calculated at different frequencies. The conductivity depends on the substituents of the complexes. The correlated barrier hopping (CBH) is the dominant conduction mechanism for complexes [CuL n (OAc)(OH 2)]2H 2 O (n = 1, 2 and 4) while for complex [CuL 3 (OAc)(OH 2)]2H 2 O the small polarons tunneling (SPT) is the dominant conduction mechanism.

Polymer complexes: XXIV. Physico-chemical studies on coordination and stability in relation to IR data for poly(cinnamaldehyde-anthranilic acid) complexes of d-block elements

Polymer Degradation and Stability, 1993

A new homopolymer derived from cinnamaldehyde and 2-substituted aniline and its Cu(II), Ni(II), C... more A new homopolymer derived from cinnamaldehyde and 2-substituted aniline and its Cu(II), Ni(II), Co(II), Zn(II), Cd(II) and Hg(II) complexes has been synthesized and characterized by elemental analysis, IR, electronic spectral, EPR, TG, 1 H-and 13 C-NMR and magnetic susceptibility ...

Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy, 2014

h i g h l i g h t s We use (PAN/AC) composite as adsorbent for the removal of textile dyes. XRD a... more h i g h l i g h t s We use (PAN/AC) composite as adsorbent for the removal of textile dyes. XRD and FRIR studies have been carried out for characterization of the composite. Langmuir and Freundlich isotherms have been used to find out the best fit model. Kinetic and thermodynamic studies of the surfactant adsorption have been investigated. Results are of marked significance to the water treatment industries. g r a p h i c a l a b s t r a c t Effect of initial dye concentration on adsorption of AR57 on to (PAN/AC) composite at dye concentration 60 mg/L, pH 1 and 25°C.

Polymer complexes. XLXI. Supramolecular spectral studies on metal–ligand bonding of novel rhodanine sulphadrugs hydrazone

Materials Chemistry and Physics, 2010

Novel polymeric complexes with 5-sulphadiazineazo-3-phenyl-2-thioxo-4-thiazolidine (HL1), 5-sulph... more Novel polymeric complexes with 5-sulphadiazineazo-3-phenyl-2-thioxo-4-thiazolidine (HL1), 5-sulphamethazineazo-3-phenyl-2-thioxo-4-thiazolidine (HL2) and 5-sulphamethoxazoleazo-3-phenyl-2-thioxo-4-thiazolidine (HL3) and various anions were prepared. Structural and spectroscopic properties have been studied on the basis of elemental analyses, infrared spectra, 1HNMR spectra, electronic spectra, magnetic measurements and ESR. IR and 1H NMR studies reveal that the ligands (HLn) exists in the tautomeric enol/hydrazo form in both states with intramolecular