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Articles 1 - 30 of 49
Full-Text Articles in Life Sciences
Utility Of N-2-Pyridyl–3-Oxobutanamide In Heterocyclic Synthesis: Synthesis Of New Dihydropyridine, Fused Pyridine, Pyridopyridone, Pyridazine And Pyridopyrimidinethione Derivatives, I. Abdel Hafiz, A. Khodair, Safaa Baker, A. Hussein
Utility Of N-2-Pyridyl–3-Oxobutanamide In Heterocyclic Synthesis: Synthesis Of New Dihydropyridine, Fused Pyridine, Pyridopyridone, Pyridazine And Pyridopyrimidinethione Derivatives, I. Abdel Hafiz, A. Khodair, Safaa Baker, A. Hussein
Al-Azhar Bulletin of Science
2-Aminopyridine was fused with ethyl acetoacetate for two hours to yield the N-2-pyridyl–3-oxobutanamide (1). However, when the reaction time was increased to 5 hours compound 3 was obtained. Condensation of 3 with benzaldehyde gave 4. The reaction of pyridopyridone 3 with arylidenemalononitrile 7a-c afforded 4H-pyran derivatives 10a-c. In contrast to the behavior of arylidenemalononitriles 7a-c towards pyridopyridine 3, benzylidenemalononitrile 7d reacted with compound 3 to give the product 11. Compound 1 was allowed to react with arylidenemalononitriles to give the dihydropyridine derivatives 17a-d. Alkylation of compound 1 with alkylating agents has been also reported. Thus, compound 1 was condensed with …
Callus Culture Of Trigonella Foenum Graecum As A Plant Tissue Culture Alternative Of Antibacterial Activity, Esam Hussein, Abdul-Rahman Al-Dubaie, Amin Elhakimi, Aziza Taj-Eldeen
Callus Culture Of Trigonella Foenum Graecum As A Plant Tissue Culture Alternative Of Antibacterial Activity, Esam Hussein, Abdul-Rahman Al-Dubaie, Amin Elhakimi, Aziza Taj-Eldeen
Al-Azhar Bulletin of Science
In the present study, Fenugreek (Trigonella foenum graecum) seeds were surface sterilized and allowed to germinate on hormone free Murashige and Skoog's culture media for one week. Hypocotyls were cut into 0.5 mm length segments. Callus morphogenesis was achieved from the hypocotyls segments Using Murashige and Skoog's culture media supplemented with benzyl adenine and naphthalene acetic acid. The best callus biomass was obtained with 2 mg/l (BA) plus 1.5 mg/L (NAA) and the growth biomass was measured after 4 weeks. This concentration was then used to plot the growth curve of callus under both dark and light growth conditions. Calli …
Physicochemical Properties Of Metakaolin-Lime Pastes At Different Calcination Temperatures Of Kaolinite Clay, M. Taher, A. El-Sayed, O. Farghaly, M. Shatat
Physicochemical Properties Of Metakaolin-Lime Pastes At Different Calcination Temperatures Of Kaolinite Clay, M. Taher, A. El-Sayed, O. Farghaly, M. Shatat
Al-Azhar Bulletin of Science
The study of metakaolin-lime hydration process is of great interest in the field of building materials technology.This study aimed to investigate experimentally the physicochemical properties of pastes containing metakaolin (MK) and lime as activator. MK was produced by calcining Kalabsha kaolinite clay (Aswan, Egypt) at different calcination temperatures 700,800,900 and 1000oC for 2 hr. Five mixes were prepared by partial substitution of MK by 5,10,15,20 and 25% wt CaO ( from CaCO3) by weight, then hydrated up to 90 days . The characteristics of prepared specimens were investigated by measuring compressive strength and total porosity. The hydration kinetics were evaluated …
Impact Of Irrigation Frequencies, Potassium Fertilizer And Vitamin Treatments On Yield, Nutrients And Amino Acid Contents Of Bread Wheat Grains, Kh El-Aref, M. Faragallah, S. Desouky
Impact Of Irrigation Frequencies, Potassium Fertilizer And Vitamin Treatments On Yield, Nutrients And Amino Acid Contents Of Bread Wheat Grains, Kh El-Aref, M. Faragallah, S. Desouky
Al-Azhar Bulletin of Science
This study is conducted to investigate the effect of irrigation intervals in combination with soil application and / or foliar spray of potassium fertilizer and soaking in some vitamins (ascorbic acid and pyridoxine) on wheat yield, certain nutrients and amino acid contents in grains, as well as field water use efficiency. The main aim of the study is to save of the irrigation water without reduction of wheat yield with facility of practical application. Two field experiments were carried out during the two successive winter seasons of 2005/2006 and 2006/2007 at the experimental farm, Faculty of Agriculture, Al-Azhar University at …
Utilization Of The Egyptian Bentonite Ore Based On New Modified Alkyds In Anticorrosive Coating Formulations, H. Abd El-Wahab, M. Abd El-Fattah, M. Abdou, F. Abd El-Hai
Utilization Of The Egyptian Bentonite Ore Based On New Modified Alkyds In Anticorrosive Coating Formulations, H. Abd El-Wahab, M. Abd El-Fattah, M. Abdou, F. Abd El-Hai
Al-Azhar Bulletin of Science
New modified alkyd resin compositions containing Egyptian bentonite ore (high grades) are evaluated as anticorrosive coating compositions for steel protection. The results indicated substantial corrosion inhibiting properties.
Effect Of Salinity On Some Wheat (Triticum Aestivum) Cultivars, Omar Almaghrabi
Effect Of Salinity On Some Wheat (Triticum Aestivum) Cultivars, Omar Almaghrabi
Al-Azhar Bulletin of Science
Four wheat cultivars of Giza 9, Giza 7, Sakha 94 and Sakha 61 were cultivated under increasing NaCl levels (0.0, 50, 100, 150 and 200 mM NaCl). The tested morphological characters of shoot and roots (fresh and dry weights as well as, shoot height of the cultivars indicated that as the salinity stress increased lower values of the tested characters elucidated. The tested cultivars showed different capacities toward salt stress, and they can be arranged in the following order according to their efficiency toward salt stress: Sakha 94> Sakha 61> Giza 9 > Giza 7. Under the same conditions the cultivars …
Synthesis Some New Quinoline Derivative Incorporated With Other Heterocyclic Compounds, Ragab El-Sayed, A. Salman
Synthesis Some New Quinoline Derivative Incorporated With Other Heterocyclic Compounds, Ragab El-Sayed, A. Salman
Al-Azhar Bulletin of Science
Reaction of 2-(quinolin-8-yloxy)acetohydrazide 1with phenyl isothiocyanate, carbon dsulphide, nitrous acid,active methylene compound and aromastic aldehydes afforded different heterocyclic compounds containing quinoline moiety 2-11. The structures of the new compounds confirmed by elemental analyses,spectroscopic measurements and chemical reactions.
Effect Of Salicylic Acid On Photosynthesis And Some Antioxidant Enzymes Of Stressed Scenedesmus Obliquus Cultures, S. Desouky
Al-Azhar Bulletin of Science
This study followed the effect of salicylic acid on growth criteria, photosynthetic pigments, photosynthesis, respiration, proline and the activities of some antioxidant enzymes of stressed Scenedesmus obliquus cultured for 7 days. The growth criteria (cell number and dry weight) and total pigments ofnon- stressed and stressed Scenedesmus obliquus cultures were significantly increased, when the algal cultures were subjected to 200 mM NaCl and treated with 100and 200 ppm of salicylic acid. Also, Photosynthesis (oxygen evolution), respiration (dark oxygen uptake), proline, amino acids and catalase enzyme of non- salinized and salinized Scenedesmus obliquus cultured were significantly increased, when the algal cultures …
Encapsulation Of Nickel(Ii)-Schiff Base Complex In Y-Zeolite For In Situ Chemisorption Of Carbon Monoxide, Tarek Salama
Encapsulation Of Nickel(Ii)-Schiff Base Complex In Y-Zeolite For In Situ Chemisorption Of Carbon Monoxide, Tarek Salama
Al-Azhar Bulletin of Science
Encapsulation of nickel(II) complex of the Schiff base-type ligand (salicylidene-p-aminobenzoic acid) in the intracrysatalline nano-pores of zeolite-Y is reported. The zeolite-encapsulated trinuclear Ni(II)-Schiff base complex was prepared by diffusion of the ligand through pores of the zeolite, already exchanged with the respective metal (flexible ligand method). The host/guest compound obtained was characterized by elemental analysis, spectroscopic (IR and electronic) studies, surface texture, thermal analysis and powder x-ray diffraction (XRD). The solids were subjected to in situ FT-IR study of adsorbed carbon monoxide. IR and UV-vis as well as XRD data indicate that the chemical stoichiometry of the complex remains intact …
Synthesis, Antibacterial, Anti-Inflammatory And Anti-Allergic Activities Of 2,4-Pyridinedicarbohydrazide And Its Related Derivatives, Osama Abd El-Salam, Mohamed Abdulla
Synthesis, Antibacterial, Anti-Inflammatory And Anti-Allergic Activities Of 2,4-Pyridinedicarbohydrazide And Its Related Derivatives, Osama Abd El-Salam, Mohamed Abdulla
Al-Azhar Bulletin of Science
2,4-Pyridinedicarbohydrazide 3 was used in synthesizing several new heterocyclic compounds with expected potential biological activity, via its reaction with various chemical reagents. A series of bis-(arylmethylidene)pyridine-2,4-dicarbohydrazides 4a-e were synthesized by condensation of 3 with various aldehydes. Further, replacement of the dicarbxylic acid functionality of 1 with five membered heterocycles, in the hope of obtaining additional pharmacological activity, encouraged us to synthesize some 2,4-bis-{pyrazolyl 5; pyrazolonyl 6; 1,3,4-oxadiazolyl 7, 9, 11, 14; 1,2,4-triazolyl 15 and triazolo[3,4-b][1,3,4]thiadiazinyl 17}pyridines.The structures of the synthesized products were identified by elemental analysis, MS, IR and 1H NMR spectroscopy. The synthesized compounds were screened for their in …
Studies Including Tolerance, Affinity And Capacity Of Certain Fungal Species For Some Toxic Elements In Aqueous Solution, A. Abdel-Razek, S. Mahmoud, H. El-Sheikh, T. Abdel-Ghany, M. Mahmoud
Studies Including Tolerance, Affinity And Capacity Of Certain Fungal Species For Some Toxic Elements In Aqueous Solution, A. Abdel-Razek, S. Mahmoud, H. El-Sheikh, T. Abdel-Ghany, M. Mahmoud
Al-Azhar Bulletin of Science
Some fungal species isolated from the soil of the radioactive repository site at HotLaboratoriesCenter were investigated for their tolerance, affinity and capacity towards different metal ions namely; Cerium Ce(III), Chromium Cr(VI), Cobalt Co(II), and Cadmium Cd(II). They were identified as Aspergillus tamarii, Aspergillus niger, Penicellium chrysogenum, Cunninghamella elegans and Rhizopus stolonifer. The obtained results showed that, the lowest concentration of metal ion could be tolerated by fungal species was 50ppm for Co(II) & Cd(II) , while the highest one was 2000ppm for Cr(VI) & Ce(III). Also, tolerance towards mixture of ions was varied among the fungi under study. The affinity …
Cobalt(Ii) Complex Binding With Copolymer As A Proficient Catalyst For Oxidation Of Catechol, Ahmed Hanafy
Cobalt(Ii) Complex Binding With Copolymer As A Proficient Catalyst For Oxidation Of Catechol, Ahmed Hanafy
Al-Azhar Bulletin of Science
The metallopolymer cobalt(II) complex of a simple pyridine- and amide-containing copolymer (CoII-P9) was prepared and characterized with IR and 1H NMR. The 1H NMR spectrum of the copolymer indicates that the average repeating unit of the copolymer P9 is vinyl pyridine:acrylamide = 5:1. The IR spectra suggest that cobalt is bound to the polymer through the pyridine nitrogen atom and the acrylamide does not participate in the binding. The oxidation of catechol by CoII-P9 in the presence of 7.5 mM H2O2 exhibits enzyme-like pre-equilibrium kinetics, yielding kcat = 0.026 ± 0.3 s–1, dissociation constant K′ = 1.9 ± 0.6 mM, …
Purification And Extraction Of Polysaccharide Specific Of Streptococcus Pyogenes Of Group A Fixing On Latex Particles, Ahmed Atia, Hussein El-Kabbani
Purification And Extraction Of Polysaccharide Specific Of Streptococcus Pyogenes Of Group A Fixing On Latex Particles, Ahmed Atia, Hussein El-Kabbani
Al-Azhar Bulletin of Science
The Streptococci are widely distributed in nature and frequently form part of the normal human flora which are members. Approximately 5-15% of humans carry Streptococcus pyogenes. Cytoplasmic membrane has antigens similar to those of human cardiac and heart valve fibroblasts. Patients may also develop immune- mediated such as acute rheumatic fever skin infections and endocarditis. S. pyogenes evolved anenzyme that specifically target IgG use as biochemical reactions, and serologic specificity. Serologic grouping is based on antigenic differences in cell wall carbohydrates (groupA). A technique for detection of antibodies against S. pyogenesgroup antigen / type antigens is being devised as one …
Effect Of Cyclosporin-A As An Immunosuppressive Drug On Islet Cells Transplantation In Mice, Ashraf Seida, Mahmoud Gabr, Gabr Ezz El-Gamal, Hassan Ibrahim, Mohamed El-Gharib
Effect Of Cyclosporin-A As An Immunosuppressive Drug On Islet Cells Transplantation In Mice, Ashraf Seida, Mahmoud Gabr, Gabr Ezz El-Gamal, Hassan Ibrahim, Mohamed El-Gharib
Al-Azhar Bulletin of Science
Transplantation of normal isolated islets of langerhans for the treatment of diabetes remains an elusive goal in clinical practice. Perhaps the major problem preventing clinical islet transplantation has been limited by the inability to prevent islet allograft or xenograft rejection. Cyclosporin A is an immunosuppressive agent that improves survival of transplant. This exciting immunosuppressive agent was first used clinically in renal transplantation in 1978 (Ferguson and Fidlus 1982).The aim of this study was the isolation , purification and transplantation of hamster pancreatic islet as xenograft transplantation for the treatment of diabetic mice. It is also aimed to study the effect …
Synthesis And Reactivity Of 2-[1-(5-Bromobenzofuran-2-Yl)-Ethylidene]Malononitrile In Synthesis Of Heterocyclic Systems;A Convenient Route For Synthesis Of Some Pyrazole, Thiophene, Thienopyrimidine, Isobenzofuran And Benzene Derivatives Incorporating Benzofuran Moiety, Mahmoud Abdelall, Ahmad Bedair, Fawzy Ali, Ahmad El-Agrody, Ahmad Halawa
Synthesis And Reactivity Of 2-[1-(5-Bromobenzofuran-2-Yl)-Ethylidene]Malononitrile In Synthesis Of Heterocyclic Systems;A Convenient Route For Synthesis Of Some Pyrazole, Thiophene, Thienopyrimidine, Isobenzofuran And Benzene Derivatives Incorporating Benzofuran Moiety, Mahmoud Abdelall, Ahmad Bedair, Fawzy Ali, Ahmad El-Agrody, Ahmad Halawa
Al-Azhar Bulletin of Science
A facile route to some pyrazole, thiophene, thienopyrimidine, phthalic anhydride and benzene derivatives incorporating benzofuran moiety is reported.
Synthesis And Fungicidal Activity Of New Thiazole Derivatives Were Prepared From 2-Bromo-1-(3,4-Dimethylphenyl)Ethanone, Mahmoud Bashandy, Mahmoud Abdelall, Ahmed El-Morsy
Synthesis And Fungicidal Activity Of New Thiazole Derivatives Were Prepared From 2-Bromo-1-(3,4-Dimethylphenyl)Ethanone, Mahmoud Bashandy, Mahmoud Abdelall, Ahmed El-Morsy
Al-Azhar Bulletin of Science
2-bromo-1-(3,4-dimethylphenyl)ethanone (2) was prepared and converted to thiazole derivatives (6-11a-c, 14-20) through reactions with different reagents. Compounds (3, 5, 12, 13, 21) were prepared from reaction of compound (2) with 2-mercapto-4,6-dimethylnicotinonitrile1H-benzo[d]imidazole-2-thiol, p-chloroaniline, potassium cyanide and 2-aminobenzenethiol respectively. The synthesized compounds were confirmed by elemental analysis, IR, 1H-NMR and mass spectral analysis.
Extrusion Of Sulfur In The Reactions Of Hydrazine Hydrate With 5-(2-Aryl-2-Oxoethylidene)-3-(2-Methoxy-Phenyl)-2-Thioxothiazolidin-4-Ones, Nadia El-Aasar
Extrusion Of Sulfur In The Reactions Of Hydrazine Hydrate With 5-(2-Aryl-2-Oxoethylidene)-3-(2-Methoxy-Phenyl)-2-Thioxothiazolidin-4-Ones, Nadia El-Aasar
Al-Azhar Bulletin of Science
Reactions of 3-substituted-5-(2-aryl-2-oxoethylidene)-2-thioxothiazolidin-4-ones 2a, b with 2.5 equiv. of hydrazine hydrate were carried out with reflux and/or at room temperature. Both of these conditions gave 4-(3-aryl-4,5-dihydro-1H-pyrazole-5-carbonyl)-4-(2-methoxyphenyl)thiosemicarbazides 3a, b and4-(2-methoxyphenyl) thiosemicarbazide 4. Inaddition, the 6-(2-oxo-2-phenylethyl)-4-(2-methoxyphenyl)-3-thioxo-1,2,4-triazinan-5-one 5a was obtained from 2a.The successful isolation of sulfur from these reactions was the key to rationalize the above mentioned transformations. The structures of all the products were evidenced by microanalytical and spectral data.
Study On Thiazolopyridines Part (7) : Synthesis Of Novel Thiazolidinone And Thiazolo[3,2-A]Pyridine Derivatives, Gameel Elhag Ali, Hessen Altamamy, Shaaban Mohamed, Zamzam Basher
Study On Thiazolopyridines Part (7) : Synthesis Of Novel Thiazolidinone And Thiazolo[3,2-A]Pyridine Derivatives, Gameel Elhag Ali, Hessen Altamamy, Shaaban Mohamed, Zamzam Basher
Al-Azhar Bulletin of Science
A novel 2-ethoxycarbonyl methylidine-4,5-dihydo-4-oxo-5-arylmethylidine-1,3-thiazole derivatives (2a-c) are obtained via the reaction of 4-thiazolinone derivative (1) with different aromatic aldehydes. Cyclization of 4-thiazolidinone derivatives (2a-c) with various α–cyanocinnamonitriles afforded the corresponding thiazolopyridine derivatives (5a-r). Thiazolopyridine derivatives (5a,b ) are refluxed with acetic anhydride, and gave N,N-diacetyl amino derivatives (8a,b).
The Feasibility Of Using Tantalum Metal As Indicator Electrode In Precipitation Titration Reactions, Enas Attia
The Feasibility Of Using Tantalum Metal As Indicator Electrode In Precipitation Titration Reactions, Enas Attia
Al-Azhar Bulletin of Science
Tantalum metalwas found to serve as an excellent indicator for potentiometric precipitation titrations. The experimental results were discussed in terms of the potential arrests and potential shifts upon addition of the titrant. The obtained results for 0.05M halogen solutions revealed that when tantalum electrode is coupled with SCE or Pt electrodes, sharp potential jumps and distinct end points were obtained in the titration of Clֿ, Brֿ and Iֿ solutions against 0.057M AgNO3 solution in both forward and backward titration techniques. On the other hand, Ta/Ag systems in forward titrations of Brֿ and Clֿ solutions behave similarly. While in backward titration, …
Synthesis Of 4-Hydroxy-3-Substituted Coumarins Of Expected Biological Activity And Their Reactions With Some Nucleophiles, Nahed Abd El-Ghaffar, Nadia Dawood, Fatma Abd El-Salam, Awtif Farrag
Synthesis Of 4-Hydroxy-3-Substituted Coumarins Of Expected Biological Activity And Their Reactions With Some Nucleophiles, Nahed Abd El-Ghaffar, Nadia Dawood, Fatma Abd El-Salam, Awtif Farrag
Al-Azhar Bulletin of Science
3-Acetyl-4-hydroxy substituted coumarins (IIa-c) were prepared. Their reactions with hydrazines in DMF gave the corresponding 4-hydroxy -(3-substituted pyrazolin-3-yl)coumarins (IVa-f) via the intermediate hydrazone (III). Their reaction with hydroxylamine hydrochloride gave the corresponding isoxazol-3-yl coumarin (VIa-c) and (VIIa,b) via the oxime intermediate (V). Reaction of II with aromatic aldehydes gave the corresponding chalcone derivatives (VIIIa-k) which were reacted with hydrazines and hydroxyl amine hydrochloride and gave (IXa) and (Xa-c). Condensation of (IIa-c)with aromatic aldehydes, malononitrilein the presence ammonium acetate yielded the corresponding 3-cyano-4-aryl nictoinamido-6-yl-coumarin (XIa-f). 4-Hydroxy comumarin (1a-c) on treatment with POCl3 in DMF give the corresponding 4-Chloro-3-formyl coumarin (XIIa-c) which …
Electroless Deposition Of Ni-Co-P, Ni-W-P And Ni-Co-W-P And Evaluation Of Their Corrosion Resistance., O. Khalifa, E. Abd El-Wahab, A. Tilp
Electroless Deposition Of Ni-Co-P, Ni-W-P And Ni-Co-W-P And Evaluation Of Their Corrosion Resistance., O. Khalifa, E. Abd El-Wahab, A. Tilp
Al-Azhar Bulletin of Science
2-Aminopyridine was fused with ethyl acetoacetate for two hours to yield the N-2- pyridyl–3-oxobutanamide (1). However, when the reaction time was increased to 5 hours compound 3 was obtained. Condensation of 3 with benzaldehyde gave 4. The reaction of pyridopyridone 3 with arylidenemalononitrile 7a-c afforded 4H-pyran derivatives 10a-c. In contrast to the behavior of arylidenemalononitriles 7a-c towards pyridopyridine 3, benzylidenemalononitrile 7d reacted with compound 3 to give the product 11. Compound 1 was allowed to react with arylidenemalononitriles to give the dihydropyridine derivatives 17a-d. Alkylation of compound 1 with alkylating agents has been also reported. Thus, compound 1 was condensed …
Biodegradation Of Some Hydrocarbons In Suez Gulf Petroleum Crude Oil By Fusarium Oxysporum, M. Afifi, R. Bayoumi
Biodegradation Of Some Hydrocarbons In Suez Gulf Petroleum Crude Oil By Fusarium Oxysporum, M. Afifi, R. Bayoumi
Al-Azhar Bulletin of Science
Among fifty fungal isolates were isolated from crude oil polluted soil samples collected from different localities in Upper Egypt (Assuit), Fusarium oxysporum C61 was selected for crude oil biodegradation due to of its high metabolic activity. The identification process of fungal genera and species resulted in fifty fungal isolates belonging to twenty six genera presented as follows: ten strains of Aspergillus, nine strains of Penicillium and one strain of Absidia, Cunninghamella, Eupenicillium, Fusarium, Nectria, Phoma and Syncephallastrum. The influence of various, pH values, nitrogen sources, phosphrous sources, amino acids and vitamins were investigated to obtain optimal crude oil biodegradation. The …
Reactivity Of 4-(4-Methoxyphenyl)-1(2h)-Phthalazinone Towards Some Nucleophiles, Nadia Dawood
Reactivity Of 4-(4-Methoxyphenyl)-1(2h)-Phthalazinone Towards Some Nucleophiles, Nadia Dawood
Al-Azhar Bulletin of Science
The reactivity of 4-(4-methoxy)phenylphthalazinone (1) towards halogen and sulphur nucleophils has been investigated. The influence of amino acids, hydrazines, acid hydrazides and sodium ethoxide on the products is discussed. The structures of the products have been assigned by elemental analyses and spectral data.
Cyanoacetanilide In Heterocyclic Chemistry: An Efficient And Improved Method For The Synthesis Of Pyrazolo[1,5-A]Pyrimid-Ine, Thiazolidine And Thiophene Derivatives, Awatef Farrag, Abd Allah Al-Sehemi, Mohamed Salem, Hamdy Sabet, Mohamed Helal
Cyanoacetanilide In Heterocyclic Chemistry: An Efficient And Improved Method For The Synthesis Of Pyrazolo[1,5-A]Pyrimid-Ine, Thiazolidine And Thiophene Derivatives, Awatef Farrag, Abd Allah Al-Sehemi, Mohamed Salem, Hamdy Sabet, Mohamed Helal
Al-Azhar Bulletin of Science
Many pyrazolo[1,5-a]pyrimidine, thiazolidine and thiophene derivatives have been synthesized via the reaction of potassium 3-(4-chloro-phenylamino)-2-cyano-3-oxo-1-(phenylamino)prop-1-ene-1-thiolate 2 with many different reagents.
Effect Of Two Triazole Thione Derivatives On Corrosion Behavior Of Molybdenum In 0.01m Hcl, E. Attia
Effect Of Two Triazole Thione Derivatives On Corrosion Behavior Of Molybdenum In 0.01m Hcl, E. Attia
Al-Azhar Bulletin of Science
4N- (2- hydroxy -3- triethyl ammonio- propyl-) fatty- 1, 2, 4 triazole -3- thione (12AB) and 2,4N- (bis- 2- hydroxy -3- triethyl ammonio- propyl-) fatty- 1, 2, 4 triazole -3- thione (12ABB) were synthesized, characterized and tested as surfactant corrosion inhibitors for Mo in 0.01 M HCl solution using galvanostatic, potentiodynamic and potentiostatic polarization techniques. Concentrations of the inhibitors were ranged from 1x10−6 to 1 (wt. %). The obtained results using galvanostatic polarization on bare metal showed that thickness of adsorbed layer decreased with increasing concentration of 12AB while adverse trend was observed with 12ABB. On the other hand the …
Purification And Extraction Of Polysaccharide Specific Of Streptococcus Pyogenes Of Group A Fixing On Latex Particles, Ahmed Atia, Hussein El-Kabbani
Purification And Extraction Of Polysaccharide Specific Of Streptococcus Pyogenes Of Group A Fixing On Latex Particles, Ahmed Atia, Hussein El-Kabbani
Al-Azhar Bulletin of Science
The Streptococci are widely distributed in nature and frequently form part of the normal human flora which are members. Approximately 5-15% of humans carry Streptococcus pyogenes. Cytoplasmic membrane has antigens similar to those of human cardiac and heart valve fibroblasts. Patients may also develop immune- mediated such as acute rheumatic fever , skin infections and endocarditis. S. pyogenes evolved anenzyme that specifically targets IgG use as biochemical reactions, and serologic specificity. Serologic grouping is based on antigenic differences in cell wall carbohydrates (groupA). A technique for detection of antibodies against S. pyogensgroup antigen / type antigens is being devised as …
Reactions Of Dipyridylketone With Group 8 Metal Carbonyls In Different Media, M. Khalil
Reactions Of Dipyridylketone With Group 8 Metal Carbonyls In Different Media, M. Khalil
Al-Azhar Bulletin of Science
Reaction of di-(2-pyridyl)ketone (dpk) with [M3(CO)12], M =Ru or Os in dioxan under reduced pressure gave the tricarbonyl derivative [Ru(CO)3(dpk)] (1) and [Os(CO)3(dpk)] (2). When these reactions were carried out in benzene/ethanol 1:1 (v:v) under reflux and reduced pressure gave the binuclear ruthenium complex [Ru2(CO)4(m-CO)(h3-dpkO,Oeth)2] (3),where h3-dpkO,Oeth is N,O,N-ethoxybis(2-pyridyl)-methanolato and the mononuclear [Os(CO)3(h3-dpkO,Oeth) (4). All complexes were characterized by elemental analysis, infrared, mass and 1H NMR spectroscopy. The spectroscopic measurements indicated that in dioxane as solvent the dpk act as bidentate ligand while in benzene/ethanol solution the dpk act as tridentate ligand. The magnetic measurements revealed that the complexes (3) …
Off-Line Solid Phase Selective Separation And Preconcentration Of Cu, Zn, Pb And Cd In Drinking Water By Solid-Phase Extraction Using 4´-(2-Hydroxyphenylazo)-3´-Methyl-1´-Phenyl-2´-Pyrazolin-5´-One Functionalized Amberlite Xad-2, N. Burham, S. Abdel Azeem, M. El-Shahat
Off-Line Solid Phase Selective Separation And Preconcentration Of Cu, Zn, Pb And Cd In Drinking Water By Solid-Phase Extraction Using 4´-(2-Hydroxyphenylazo)-3´-Methyl-1´-Phenyl-2´-Pyrazolin-5´-One Functionalized Amberlite Xad-2, N. Burham, S. Abdel Azeem, M. El-Shahat
Al-Azhar Bulletin of Science
A new solid – phase extraction sorbent is developed based on stepwise anchoring of two ligand molecules for the determination of copper, zinc, lead and cadmium in drinking water by flame AAS. Amberlite XAD-2 functionalized with 4´-(2-hydroxyphenylazo)-3´-methyl-1´-phenyl-2´-pyrazolin-5´-one (HPAPyr) was utilized for preconcentration/separation of these elements. The sorbent was prepared by two successive azo coupling reactions. Firstly, 2-aminophenol was anchored to the amino groups in the resin resulted from nitration followed by reduction. Then, the resulted 2-aminophenol functionalized resin was further diazotized and coupled to pyrazolone compound and the final product HPAPyr-XAD-2 was characterized by IR and elemental analysis. The optimum …
Electrochemical Behavior Of Molybdenum Electrode In Acetic, Formic And Oxalic Acid Solutions., E. Attia, A. El- Shennawy, W. Hussein
Electrochemical Behavior Of Molybdenum Electrode In Acetic, Formic And Oxalic Acid Solutions., E. Attia, A. El- Shennawy, W. Hussein
Al-Azhar Bulletin of Science
The electrochemical behavior of molybdenum electrode in acetic, formic and oxalic acid solutions is studied. The effect of immersion time, composition medium, applied voltage, applied current density and scanning rate is investigated using potentiodynamic, potentiostatic and galvanostatic polarization measurements. The stability of the oxide film formed on Mo electrode is affected by both the formation medium and the applied potential. In 0.5N oxalic acid, the critical applied voltage below which the current start to oscillate is equal to -80 mV. The rate of dissolution of anodic oxide film formed on Mo in oxalic acid is very rapid compared with that …
Protective Effect Of Β-Carotene On Gamma Radiation- Induced Renal Histological And Ultrastructural Changes In Male Albino Rats, Seham Abu-Nour, Mohamed Rady, Ihab Khalil
Protective Effect Of Β-Carotene On Gamma Radiation- Induced Renal Histological And Ultrastructural Changes In Male Albino Rats, Seham Abu-Nour, Mohamed Rady, Ihab Khalil
Al-Azhar Bulletin of Science
The present work was conducted to investigate the histological and ultra-structural changes in the kidney tissues of male albino rats due to the exposure of gamma-radiation and to investigate tissue-protection from the damaging effects of gamma-radiation using a natural product namely, Beta-carotene. The histological studies revealed progressive pathological lesions in the kidney of whole body γ-irradiated rats; as represented by severe damage in glomerular tuft and increase in masengal cells with wide Bowman's space and sever hemorrhagic areas between degenerated renal tissue, andrenal tubules exhibited various degrees of degeneration. The ultra-structural studies revealed that epithelial cells lining the proximal and …