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Articles 1 - 30 of 35
Full-Text Articles in Life Sciences
Synthesis And Evaluation Of Novel Bituminous Materials For Using It In Construction Applications, G. Elkady, M. El-Shafie, Usama Fareed, Elsayed Elnaggar, A. Saleh, Mostafa Shohide
Synthesis And Evaluation Of Novel Bituminous Materials For Using It In Construction Applications, G. Elkady, M. El-Shafie, Usama Fareed, Elsayed Elnaggar, A. Saleh, Mostafa Shohide
Al-Azhar Bulletin of Science
Recently, the application of asphalt in coating purposes presented in different ways. On the other hand polymers are used to improve the properties of asphalt to use in coating purpose. Although asphalt has low cost, high cohesive nature, rheological properties and high thermal resistance but it is not practically used in coating, this because the long curing time of asphalt on the surface of the substrate which Inappropriate industrially, also asphalt need to additives to improve resistance to chemicals. So the aim of this research is to use polyurethane to improve asphalt properties to produce low cast, high qualified asphaltic …
Removal Of Malachite Green From Aqueous Solution By Sorption Method On Alkali-Activated Water Hyacinth Stems, Hassan El-Adawy
Removal Of Malachite Green From Aqueous Solution By Sorption Method On Alkali-Activated Water Hyacinth Stems, Hassan El-Adawy
Al-Azhar Bulletin of Science
Water hyacinth (Eichhornia crassipes) was found to have biosorption capacity for cationic dye, malachite green (MG) from aqueous solutions. The study was carried out under various experimental conditions such as dye concentration, adsorption dose, pH and temperature to assess the potentiality of alkali activated water hyacinth stems (AAWHS) for the removal of malachite green dye from waste-effluents. A high percentage of dye removal was observed with the decrease in the initial concentration of dye and increase in amount of adsorbent. Equilibrium isotherms were analysed according to the Langmuir models of adsorption, showing to be applicable with maximum monolayer adsorption capacity …
Physico-Chemical Characteristics And Natural Radioactivity Of Ismailia Canal Water, River Nile, Egypt., S. Abdel Razeq, S. Soliman, W. Bakr, I. Abdel Ghafar
Physico-Chemical Characteristics And Natural Radioactivity Of Ismailia Canal Water, River Nile, Egypt., S. Abdel Razeq, S. Soliman, W. Bakr, I. Abdel Ghafar
Al-Azhar Bulletin of Science
Ismailia Canal is considered as one of the most important drinking and irrigation water source in Egypt. Twenty four water samples were collected during four successive seasons from summer 2010 to spring 2011 along the area extending from El Mazallat to Anshas . Physical parameters temperature, E.C and TDS and chemical parameters pH ,alkalinity, TH, DO, COD, BOD, NH3 ,NO2- ,NO3- , PO4-3 , Cl-, F-, Br- ,SO4 -2 ,Ca2+,Mg2+, Na+, K+, Fe+3, Cd+2, Zn+2, Cu+2, Pb+2, and Al+3 were analyzed to identify water quality of Ismailia Canal. The results of these analyses, when compared with Egyptian and international standards …
Physicochemical Studies And Application Of Some Natural Extracts And Its Metallic Mordant Complexes As Dyes For Textile Fabrics, Rabie Farag, S. Shakra, Hassan El Adway, Ali. Ali
Physicochemical Studies And Application Of Some Natural Extracts And Its Metallic Mordant Complexes As Dyes For Textile Fabrics, Rabie Farag, S. Shakra, Hassan El Adway, Ali. Ali
Al-Azhar Bulletin of Science
The aim of this present study is to evaluate the performance and efficiency of dyeing of cotton, wool and polyamide from dry skin Allium cepa and henna fabrics with natural dyes obtained as extracts leaves. In recent years, an upsurge of interest in natural dyes has been manifested as replacement of synthetic dyes for food and drugs’ safety and so forth. Natural dyes have limitations of fastness, and brilliancy of shade. Therefore, in present work, use of metallic mordant was investigated to produce depth of shade, bright and fast colors. Natural dyes may chemically be classified as vat, direct, acid …
Hydrothermal Synthesis And Characterization Of Nano Sized Zsm-5 And Their Effect On The Decolorization Of Indigo Carmine Dye, Ibraheem Ali, Ibrahem Ibrahem, Karam Elnasser
Hydrothermal Synthesis And Characterization Of Nano Sized Zsm-5 And Their Effect On The Decolorization Of Indigo Carmine Dye, Ibraheem Ali, Ibrahem Ibrahem, Karam Elnasser
Al-Azhar Bulletin of Science
Silica sources can influence different effects of ZSM-5 crystallization and it leads to change in the properties of the final product. The crystallinity of nanosized ZSM-5 zeolite from precursors mixtures containing different silica sources, e.g. tetraethylorthosilicate (TEOS), colloidal silica (CS), silicic acid(SA) and fumed silica(FS) have been studied. The produced samples are investigated using XRD, SEM, FT-IR, pyridine adsorption and N2 adsorption measurements. XRD results show that the product obtained by different silica sources is nano sized ZSM-5 phase. SEM results show that silica sources influences on shape of the produced ZSM-5; the sample which was prepared by silicic acid …
Range And Average Of Hydrochemical Ratios Of The Different Surface Water Samples In River Nile And Canals, M. Wassel, G. El-Kady, S. El-Demerdashe, A. Mahmod
Range And Average Of Hydrochemical Ratios Of The Different Surface Water Samples In River Nile And Canals, M. Wassel, G. El-Kady, S. El-Demerdashe, A. Mahmod
Al-Azhar Bulletin of Science
It is found that all River Nile and canals water samples are suitable for all kinds of fruits, vegetables and field crops, where EC values are (< 4) m mhos/cm, while the rest of samples (mixed water samples) are unsuitable for irrigating any type of crops, since their salinities are over (16) mmhos/cm. The study indicated that, all River Nile and canals water samples can be classified as water of the first grade (class I) while mixed water samples can be classified as water of the third grade (class III) of irrigation water.
Removal Of Laser Printer Toner From The Paper Surface Using Some Chemical Methods, S. Shara, A. Aboul El-Magd, Y. Moustafa, A. Bakr, I. Aziz
Removal Of Laser Printer Toner From The Paper Surface Using Some Chemical Methods, S. Shara, A. Aboul El-Magd, Y. Moustafa, A. Bakr, I. Aziz
Al-Azhar Bulletin of Science
In this article, organic solvents are applied to a range of toner- paper combinations to determine their ability to remove toner. Paper sample printed from HP Laserjet 2300dn is soaked in 300 mlof 17 alone solvent and 133 solvent mixtures for 30 minat room temperature.Visual effect of solvent on toner and paper can be classified into 6 groups A, B, C, D, E and F.The effect of varying the solvents proportions in the mixture is explored. Solvents give good dissolving results for paper sample printed from HP Laserjet 2300dn applied on paper samples printed from different brands and same brands …
Synthesis And Characterization Of Two Hydrazones Of Isatine And Their Some Transition Metal Complexes., Badr El-Sayed, Amal Kaaki, Saleh Mekkey
Synthesis And Characterization Of Two Hydrazones Of Isatine And Their Some Transition Metal Complexes., Badr El-Sayed, Amal Kaaki, Saleh Mekkey
Al-Azhar Bulletin of Science
A series of complexes of Co(II), Ni(II), Cu(II), Zn(II), Cd(II) have been synthesized with two hydrazones derived from Isatin with salicylaldehyde (HLa) and 2,4-dinitro phenyl hydrazine (Lb). The complexes have been characterized by the elemental analysis, spectral (FTIR, Mass, Electronic, 1HNMR, ESR), Thermal analysis (TGA&DTA), Magnetic moments and conductance measurements. The proposed structures of the prepared complexes were octahedral (Co(II)-HLa), tetrahedral for Ni(II), Zn(II), Cd(II)-HLa complexes and square planar for (Cu(II)-HLa, Lb Zn(II)-Lb complexes. The synthesized ligands (HLa and Lb) were tested for their antibacterial activities. Only HLa ligand displayed activity against staphylococcus aureas (g +ve)
Photocatalytic Degradation Of Direct Violet 4-Azodye In Aqueous Solution Using Α-Fe2o3thin Films, Abdelmeguid Aboubaraka, Medhat El-Moselhy, Mahmoud Zaher, El-Zeiny Ebeid
Photocatalytic Degradation Of Direct Violet 4-Azodye In Aqueous Solution Using Α-Fe2o3thin Films, Abdelmeguid Aboubaraka, Medhat El-Moselhy, Mahmoud Zaher, El-Zeiny Ebeid
Al-Azhar Bulletin of Science
This study involves the preparation of α-Fe2O3 thin films coated on microscopic glass slides by thermal spray followed by thermally- induced decomposition of Prussian Blue(PB), Fe4[Fe(CN)6]3, in air at 250°C. XRD and SEM were used to characterize the synthesized thin films for surface morphology texturing. Photocatalytic activity of α-Fe2O3 thin films was investigated using direct violet 4-azodye, employing heterogeneous photocatalytic process. Two different types of light have been used in this study, one using UV light and the other using visible light using a 100-watt tungsten lamp. α-Fe2O3 thin film does not give any significant effect upon using UV light …
Potentiometric And Thermodynamic Investigation Of Rhenium(V) Complexes With 1-Methyl-2-Mercaptoimidazole, G. Gouda, M. Shatat, T. Seaf Elnasr, M. Abdallah
Potentiometric And Thermodynamic Investigation Of Rhenium(V) Complexes With 1-Methyl-2-Mercaptoimidazole, G. Gouda, M. Shatat, T. Seaf Elnasr, M. Abdallah
Al-Azhar Bulletin of Science
Stability constants of 1-methyl-2-mercaptoimidazole with rhenium(V) were determined potentiometrically in acidic medium (4 M HCl) at different temperatures. The dissociation constants pK of 1-methyl-2-mercaptoimidazole as well as the stability constants (log K) of their complexes were determined at varieties temperatures. The corresponding thermodynamic parameters (∆Go, ∆Ho and ∆So) were determined and discussed. The formation of the metal complexes has been found to be exothermic.
Water Salinity, Total, Temperary And Permanent Of The Pleistocene Aqifer Samples In El-Sadat Area., M. Wassel, A. Swlem, S. Shama, A. Hamouda, A. Desouky
Water Salinity, Total, Temperary And Permanent Of The Pleistocene Aqifer Samples In El-Sadat Area., M. Wassel, A. Swlem, S. Shama, A. Hamouda, A. Desouky
Al-Azhar Bulletin of Science
From the arithmetic mean values of different ions that predict the most effective ions affecting the salinity level, the obtained data of Pleistocene aquifer show that the effective ions that cause an increase of water salinity are in the orders: Na+ > Ca2+ > Mg 2+ as cations, HCO3-> Cl-> SO42- as anions As a result of cation exchange processes, the increase of Na+ concentration and decrease in Ca2+ and Mg2+ in solution, lead to a considerable decrease in salts causing temporary and permanent hardness in form of CaMg(HCO3)2 and CaMgSO4 salts, respectively. While causing a considerable increase in water salinity but …
Role Of The Cipa Scaffoldin Protein In Cellulose Solubilization, As Determined By Targeted Gene Deletion And Complementation In Clostridium Thermocellum, Daniel G. Olson, Richard J. Giannone, Robert L. Hettich, Lee R. Lynd
Role Of The Cipa Scaffoldin Protein In Cellulose Solubilization, As Determined By Targeted Gene Deletion And Complementation In Clostridium Thermocellum, Daniel G. Olson, Richard J. Giannone, Robert L. Hettich, Lee R. Lynd
Dartmouth Scholarship
The CipA scaffoldin protein plays a key role in the Clostridium thermocellum cellulosome. Previous studies have revealed that mutants deficient in binding or solubilizing cellulose also exhibit reduced expression of CipA. To confirm that CipA is, in fact, necessary for rapid solubilization of crystalline cellulose, the gene was deleted from the chromosome using targeted gene deletion technologies. The CipA deletion mutant exhibited a 100-fold reduction in cellulose solubilization rate, although it was eventually able to solubilize 80% of the 5 g/liter cellulose initially present. The deletion mutant was complemented by a copy of cipA expressed from a replicating plasmid. In …
Killerflip: A Novel Lytic Peptide Specifically Inducing Cancer Cell Death, B Pennarun, G. Gaidos, O Bucur, A Tinari
Killerflip: A Novel Lytic Peptide Specifically Inducing Cancer Cell Death, B Pennarun, G. Gaidos, O Bucur, A Tinari
Dartmouth Scholarship
One of the objectives in the development of effective cancer therapy is induction of tumor-selective cell death. Toward this end, we have identified a small peptide that, when introduced into cells via a TAT cell-delivery system, shows a remarkably potent cytoxicity in a variety of cancer cell lines and inhibits tumor growth in vivo, whereas sparing normal cells and tissues. This fusion peptide was named killer FLIP as its sequence was derived from the C-terminal domain of c-FLIP, an anti-apoptotic protein. Using structure activity analysis, we determined the minimal bioactive core of killerFLIP, namely killerFLIP-E. Structural analysis of cells using …
An Expanded View Of The Eukaryotic Cytoskeleton, James B. Moseley
An Expanded View Of The Eukaryotic Cytoskeleton, James B. Moseley
Dartmouth Scholarship
A rich and ongoing history of cell biology research has defined the major polymer systems of the eukaryotic cytoskeleton. Recent studies have identified additional proteins that form filamentous structures in cells and can self-assemble into linear polymers when purified. This suggests that the eukaryotic cytoskeleton is an even more complex system than previously considered. In this essay, I examine the case for an expanded definition of the eukaryotic cytoskeleton and present a series of challenges for future work in this area.
Raman Spectroscopy As A Teaching Tool In The Forensic Science And Chemistry Courses, Zhaohua Dai, Elmer-Rico E. Mojico
Raman Spectroscopy As A Teaching Tool In The Forensic Science And Chemistry Courses, Zhaohua Dai, Elmer-Rico E. Mojico
Cornerstone 3 Reports : Interdisciplinary Informatics
No abstract provided.
Acquisition Of An Electrochemical System Instrument For The Development Of Sensors, Elmer-Rico E. Mojico
Acquisition Of An Electrochemical System Instrument For The Development Of Sensors, Elmer-Rico E. Mojico
Cornerstone 1 Reports : Expansion and Enhancements of the Thinkfinity Platform
No abstract provided.
Detection Of Boronic Acids Through Excited-State Intramolecular Proton-Transfer Fluorescence, Matthew R. Aronoff, Brett Vanveller, Ronald T. Raines
Detection Of Boronic Acids Through Excited-State Intramolecular Proton-Transfer Fluorescence, Matthew R. Aronoff, Brett Vanveller, Ronald T. Raines
Brett VanVeller
Boronic acids are versatile reagents for the chemical synthesis of organic molecules. They and other boron-containing compounds can be detected readily by the interruption of the excited-state intramolecular proton transfer (ESIPT) of 10-hydroxybenzo[h]quinolone. This method is highly sensitive and selective, and useful for monitoring synthetic reactions and detecting boron-containing compounds on a solid support.
Bioengineered Lysozyme Reduces Bacterial Burden And Inflammation In A Murine Model Of Mucoid Pseudomonas Aeruginosa Lung Infection, Charlotte C. Teneback, Thomas C. Scanlon, Matthew J. Wargo, Jenna L. Bement, Karl E. Griswold, Laurie W. Leclair
Bioengineered Lysozyme Reduces Bacterial Burden And Inflammation In A Murine Model Of Mucoid Pseudomonas Aeruginosa Lung Infection, Charlotte C. Teneback, Thomas C. Scanlon, Matthew J. Wargo, Jenna L. Bement, Karl E. Griswold, Laurie W. Leclair
Dartmouth Scholarship
The spread of drug-resistant bacterial pathogens is a growing global concern and has prompted an effort to explore potential adjuvant and alternative therapies derived from nature's repertoire of bactericidal proteins and peptides. In humans, the airway surface liquid layer is a rich source of antibiotics, and lysozyme represents one of the most abundant and effective antimicrobial components of airway secretions. Human lysozyme is active against both Gram-positive and Gram-negative bacteria, ac
P53'S Choice Of Myocardial Death Or Survival: Oxygen Protects Infarct Myocardium By Recruiting P53 On Nos3 Promoter Through Regulation Of P53-Lys118 Acetylation, Rajan Gogna, Esha Madan, Mahmood Khan, Uttam Pati, Periannan Kuppusamy
P53'S Choice Of Myocardial Death Or Survival: Oxygen Protects Infarct Myocardium By Recruiting P53 On Nos3 Promoter Through Regulation Of P53-Lys118 Acetylation, Rajan Gogna, Esha Madan, Mahmood Khan, Uttam Pati, Periannan Kuppusamy
Dartmouth Scholarship
Myocardial infarction, an irreversible cardiac tissue damage, involves progressive loss of cardiomyocytes due to p53-mediated apoptosis. Oxygenation is known to promote cardiac survival through activation of NOS3 gene. We hypothesized a dual role for p53, which, depending on oxygenation, can elicit apoptotic death signals or NOS3-mediated survival signals in the infarct heart. p53 exhibited a differential DNA-binding, namely, BAX-p53RE in the infarct heart or NOS3-p53RE in the oxygenated heart, which was regulated by oxygen-induced, post- translational modification of p53. In the infarct heart, p53 was heavily acetylated at Lys118 residue, which was exclusively reversed in the oxygenated heart, apparently regulated …
Endocytic Trafficking Of Nanoparticles Delivered By Cell-Penetrating Peptides Comprised Of Nona-Arginine And A Penetration Accelerating Sequence, Betty Revon Liu, Shih-Yen Lo, Chia-Chin Liu, Chia-Lin Chyan, Yue-Wern Huang, Robert Aronstam, Han-Jung Lee
Endocytic Trafficking Of Nanoparticles Delivered By Cell-Penetrating Peptides Comprised Of Nona-Arginine And A Penetration Accelerating Sequence, Betty Revon Liu, Shih-Yen Lo, Chia-Chin Liu, Chia-Lin Chyan, Yue-Wern Huang, Robert Aronstam, Han-Jung Lee
Biological Sciences Faculty Research & Creative Works
Cell-penetrating peptides (CPPs) can traverse cellular membranes and deliver biologically active molecules into cells. In this study, we demonstrate that CPPs comprised of nona-arginine (R9) and a penetration accelerating peptide sequence (Pas) that facilitates escape from endocytic lysosomes, denoted as PR9, greatly enhance the delivery of noncovalently associated quantum dots (QDs) into human A549 cells. Mechanistic studies, intracellular trafficking analysis and a functional gene assay reveal that endocytosis is the main route for intracellular delivery of PR9/QD complexes. Endocytic trafficking of PR9/QD complexes was monitored using both confocal and transmission electron microscopy (TEM). Zeta-potential and size analyses indicate the importance …
Synthesis, Characterization And Biological Activity Of Thiourea Containing Polymers, F. Abdel Hai, H. Abdel Whhab, G. Ahmed
Synthesis, Characterization And Biological Activity Of Thiourea Containing Polymers, F. Abdel Hai, H. Abdel Whhab, G. Ahmed
Al-Azhar Bulletin of Science
N-acryloyl-N-phenylthiourea (APTU) is synthesized by reacting acryloyl chloride with phenylthiourea in the presence of triethylamine (TEA) as a base and characterized by FT-IR, 1H-NMR and mass spectra. The acrylic polymers from different feed ratios of ethylacrylate (EA), methylmethacrylate (MMA), styrene (St) and APTU have been prepared by emulsion polymerization in water containing sodium lauryl sulfate as a surfactant and ammonium persulfate as a water-soluble radical initiator. The polymers are characterized by FT-IR spectroscopy. The solubility is tested in various polar and non-polar solvents. The molecular weight and polydispersity are determined using gel permeation chromatography (GPC).Thermal behavior of the prepared polymers …
New Antimicrobial Coating Compositions Based On 3,6-Dichloro Bezo[B]Thiophene-2-Carbonyl Glutamic Acid. (Dcbtga) . Modified Polyesteramide Resins As Binder For Industrial Applications, Raafat. El-Eisawy, H. Abd El-Waha, F. Abd El-Hai, M. Youssef
New Antimicrobial Coating Compositions Based On 3,6-Dichloro Bezo[B]Thiophene-2-Carbonyl Glutamic Acid. (Dcbtga) . Modified Polyesteramide Resins As Binder For Industrial Applications, Raafat. El-Eisawy, H. Abd El-Waha, F. Abd El-Hai, M. Youssef
Al-Azhar Bulletin of Science
Thiophene and their derivatives products are some of the oldest and best known class of nitrogen and sulphur containing compounds. In recent years there has been considerable interest in the thiophene -based family of materials due to the wide range of antimicrobial activity properties when incorporated into polymers and their composites. In this research new modified polyesteramide resin compositions which are prepared by partial replacement of phthalic anhydride (PA) with 3,6-dichloro bezo[b]- thiophene-2carbonyl glutamic acid (DCBTGA), as a new source of the dibasic acid and as preservative against microbiological attack with N, N- bis - (2-hydroxyethyl) linseed oil fatty acid …
Physicochemical Studies On The Surface Water Of River Nile And Its Canals, M. Wassel, G. El-Kady, S. El-Demerdashe, A. Mahmod
Physicochemical Studies On The Surface Water Of River Nile And Its Canals, M. Wassel, G. El-Kady, S. El-Demerdashe, A. Mahmod
Al-Azhar Bulletin of Science
The study of surface water chemistry mainly based on the results of the chemical analysis which carried out for the thirty-nine (39) collected water samples. The analysis includes the determination of the different properties of water such as electric conductivity(EC), hydrogen ion concentration (pH), total dissolved salts (TDS), turbidity , major ions as cations ( Ca2+, Mg2+,Na+, K+),anions (CO₃2⁻,HCO₃⁻ ,SO₄2⁻,Cl⁻) together with some minor and trace components as PO₄3⁻,NO₃⁻,Pb2+,Cd2+,Sr2+ . Based on the chemical analysis data of surface water of the main irrigation system (River Nile and its Canals) the conclusions could be outlined as follows: Water salinity, Distribution of …
Studies On The Preparation Modified Chitosan And Its Applications, M. Wassel, A. Swlem, S. Shama, A. Hamoda, A. Desouky
Studies On The Preparation Modified Chitosan And Its Applications, M. Wassel, A. Swlem, S. Shama, A. Hamoda, A. Desouky
Al-Azhar Bulletin of Science
Chitosan, as a natural polysaccharide, has reactive amino and hydroxyl groups in its linear polyglucosamine chains, can be used to functionalize and modify. However, conventional modification method using single chitosan crosslinking with glutaraldehyde generally leads to decrease of functional groups (–NH2–) and loading capacity, it's interested to prepare multifunctional chitosan-X which used in many applications such as water treatment by using diethylenetriamine pentaacetic acid (DTPA) with sufficient number of carboxyl groups on the backbones, is a commonly used as chelating agent for heavy metal. The preparation of modified chitosan investigated by IR, XRD, SEM and also mechanical properties which determined …
Investigate The Adsorption Kinetics And Isotherm Models Of Pb(Ii) Ionsremoval By Resinextmk-8 Strong Acid Cation Exchange Resin., M. Wassel, A. Swelam, A. El-Zaref
Investigate The Adsorption Kinetics And Isotherm Models Of Pb(Ii) Ionsremoval By Resinextmk-8 Strong Acid Cation Exchange Resin., M. Wassel, A. Swelam, A. El-Zaref
Al-Azhar Bulletin of Science
In the present study we investigated the adsorption kinetics and isotherm models of Pb(II) removal by ResinexTM K-8 strong acid cation exchange resin at different temperatures. Adsorption kinetics is investigated to develop an understanding of controlling reaction pathways (e.g. chemisorptions versus physisorption) and the mechanisms (e.g. surface versus intraparticle diffusion) of adsorption reactions. Kinetic data can be used to predict the rate at which the target contaminant is removed from aqueous (pure water) and aqueous-organic solutions (formic, acetic, propionic) and equilibrium adsorption isotherms are used to quantify the adsorptive capacity of an adsorbent. The results can be used to assess …
Evaluation Of Suraface Water In Rivernile And Canals For Irrigation Purposes, M. Wassel, G. El-Kady, S. El-Demerdashe, A. Mahmod
Evaluation Of Suraface Water In Rivernile And Canals For Irrigation Purposes, M. Wassel, G. El-Kady, S. El-Demerdashe, A. Mahmod
Al-Azhar Bulletin of Science
In this paper we carried out the determination of the different properties of water such as electric conductivity(EC), hydrogen ion concentration (pH), total dissolved salts (TDS), turbidity , major ions as cations ( Ca2+, Mg2+, Na+, K+), anions (CO₃2⁻, HCO₃⁻ ,SO₄2⁻, Cl⁻). The results indicate that an increase in total, temporary and permanent hardness with increasing water salinity in all surface water according to the change of water type from fresh to saline water. This is mainly attributed to the effect of leaching and dissolution of soluble salts leading to the increase of hardness with particular importance to the effect …
Kinetics And Thermodynamic Behavior Of Some Prepared Benzimidazole And Chromene Dyes On Polyester Fibre., M. Aboul-Fetouh, S. Shakra, A. Ghattas, F. El Sayed Hassan
Kinetics And Thermodynamic Behavior Of Some Prepared Benzimidazole And Chromene Dyes On Polyester Fibre., M. Aboul-Fetouh, S. Shakra, A. Ghattas, F. El Sayed Hassan
Al-Azhar Bulletin of Science
Diffusion as a function of temperature of benzimidazole and chromene dyes. It is well known that a carrier is not required for the dyeing of polyester at temperature exceeding 100◦ C (high temperature dyeing process). This is due to the fact that the diffusion coefficient increases with rising temperature. The extent of this increase was found by measuring exhaustion curves at different temperatures.
Dyeing Behavior And Performance Of Prepared Benzimidazole And Chromene Disperse Dyes As Applied On Polyester Fibre, And Its Blends With Wool., S. Shakra, M. Aboul-Fetouh, A. Ghattas, F. Hassan
Dyeing Behavior And Performance Of Prepared Benzimidazole And Chromene Disperse Dyes As Applied On Polyester Fibre, And Its Blends With Wool., S. Shakra, M. Aboul-Fetouh, A. Ghattas, F. Hassan
Al-Azhar Bulletin of Science
Azo disperse dyes Ia-f - Va-f were synthesized from corresponding amines, where IR and visible spectra were evaluated. The prepared dyes were used for dyeing polyester, polyester woolen type and wool fibres.A range of bright and leveled shade have been obtained on application of these disperse dyes. The K/S values for various dyed substrate are in the following order, Wool > polyester/wool > polyester.
Effect Of Limestone On The Hydration Characteristics Of Portland-Pozzolana Cement Mortars, Mostafa Emara, Salah Abo-El-Enein, Eisa Hekal, Mohamed Bdel-Wahab
Effect Of Limestone On The Hydration Characteristics Of Portland-Pozzolana Cement Mortars, Mostafa Emara, Salah Abo-El-Enein, Eisa Hekal, Mohamed Bdel-Wahab
Al-Azhar Bulletin of Science
The aim of this work is to utilize some Egyptian by-products such as granulated blast-furnace slag (GBFS) and fired clay or waste clay bricks known as Homra to produce economic blended cement. The effect of addition of limestone as a filler on the hydration characteristics of such blended cements was investigated. The effect of artificial pozzolana (waste clay bricks) and GBFS in the absence and presence of limestone on the physico-chemical and mechanical properties of the hardened cement pastes was studied. A various dry cement blends were prepared by mixing of ordinary Portland cement (OPC) with waste clay bricks (WCB) …
Performance Enhancement Of Asphalt Pavement, A. Saleh, M. El-Shafie, G. Elkady, M. Wassel, E. Ghally
Performance Enhancement Of Asphalt Pavement, A. Saleh, M. El-Shafie, G. Elkady, M. Wassel, E. Ghally
Al-Azhar Bulletin of Science
Age hardening of paving grade asphalt is a major factor affecting the durability of bitumen pavement. In this research, 60/70 penetration grade asphalt is modified using Styrene Butadiene Rubber(SBR) in percentages by weight of asphalt ranging from 2 to 6% and 1% by weight of asphalt of an antioxidant namely 4.4. thio bis (6- tertiary butyl – m – cresol (TBMTBP). The antioxidant is used to delay the age hardening . Hot mixes asphalt using the virgin and modified asphalt samples are prepared and evaluated using Marshall test method . Fourier Transform Infra Red (FTIR) is used to analyze all …