Khalaf Ali Fayez Abuamra

استاذ - أستاذ متفرغ

كلية العلوم

العنوان: قسم النبات والميكروبيولوجى -كلية العلوم -جامعة سوهاج



المنشورات و المؤلفات التي تحتوي علي الكلمة المفتاحية: Antimicrobial

2021-04-18 00:50:32 الكلمات المفتاحية Antimicrobial, anti-cancer,
Temperature and salt effects of the kinetic reactions of substituted 2-pyridylmethylene-8-quinolyl iron (II) complexes as antimicrobial, anti-cancer and antioxidant agents with Cyanide ions
Kinetics of substitution reaction of three high spin pyridylmethylene-8-quinolyl iron (II) complexes by CN- ions are studied spectophotometrically in various ratios of aqueous-methanol binary mixtures at 298 ± 0.2 K. Kinetics of the substitution reaction follow the rate law (k2[CN−][complex])on applying of the conditions of the pseudo-first-order. Reactivity of the reaction was investigated in terms of organic ligand moiety and ... إقراء المزيد

2018-11-21 09:30:25 الكلمات المفتاحية VO(II), Anti cancer, Antimicrobial, NMR, IR, TGA, Imine complexes,
Synthesis, Spectral Characterization, DNA Interaction, Antimicrobial  and Anticancer Activities  of Some Tri- and Tetra-dentate imine VO(II) Complexes
The new imine ligands were synthesized by the condensation reaction between 2-hydroxynaphthaldehyde or 3-ethoxysalicylaldehyde and _o_-phenylenediamine s in 1:1 molar ratio. The ligands react with vanadyl acetylacetonate in 1:1 molar ratio to give distorted and square pyramidal geometry for tri- and tetra-dentate imine complexes, respectively. All the complexes are non– hygroscopic in nature and stable to the atmosphere. The synthesized ... إقراء المزيد

2019-09-06 08:42:08 الكلمات المفتاحية DNA-binding, Aryl imidazole, anticancer activity, Antimicrobial, microorganism,
Facile Synthesis, X-ray structure of new Multi-Substituted Aryl Imidazole ligand, Biological Screening and DNA binding of itsCr(III), Fe(III) and Cu(II) coordination  compounds as potential antibiotic and anticancer drugs
A simple highly adjustable and effective synthesis of aryl imidazole ligand HL namely (2‐(1‐butyl‐4,5-diphenyl‐1H‐imidazol‐2‐yl)(4-bromophenol) was discussed where it was prepared by cyclo condensation of 5-Bromo-2-hydroxybenzaldehyde, benzil and Butan-1-amine. Three new Cr(III), Fe(III) and Cu(II) complexes of aryle imidazole ligand were synthesized. The multi-substituted aryl imidazole ligand (HL) and its complexes were characterized by using physicochemical and IR and electronic spectral ... إقراء المزيد

2018-10-15 20:21:40 الكلمات المفتاحية Sultan Hassan Mosque, Limestone, Bacillus, Aspergillus, Antimicrobial,
Microbial deterioration of limestone of Sultan Hassan mosque, Cairo- Egypt and suggested treatment
Abstract : Sultan Hassan Mosque is one of the most important mosques in Egypt and the Islamic world because of its special architectural style. However, many causes of its limestone deteriorations were found. Moreover, it is exposed to the influence of ground water caused by sewage. Therefore, the study examines the environmental factors. Chemical analyses by X-ray diffraction and X-ray ... إقراء المزيد

2018-09-24 03:35:43 الكلمات المفتاحية ricinine alkaloid, antiquorum-sensing, Ricinus communis L, Antimicrobial,
Antimicrobial and antiquorum-sensing activity of Ricinus communis extracts and ricinine derivatives
Ricinine (1), a known major alkaloid in Ricinus communis plant, was used as a starting compound for the synthesis of six ricinine derivatives; two new and four known compounds. The new derivatives; 3-amino-5-methyl-1H-pyrazolo[4,3-c]pyridin-4(5H)-one (2), and 3-amino-5-methyl-1-(phenylsulfonyl)-1H-pyrazolo[4,3-c]pyridin-4(5H)-one (3), as well as the previously prepared derivatives (4-7) were subjected for antimicrobial and antiquorum-sensing evaluation in comparison to different R. communis extracts. Acetyl ... إقراء المزيد

2018-09-16 13:48:24 الكلمات المفتاحية DNA interaction, Antimicrobial, TEM, TGA, amino acid, Azomethine, IR, NMR,
Recent advances in synthesis, characterization and biological activity of nano sized Schiff base amino acid M (II) complexes
Azomethine amino ligands derived from the condensation of 3-methoxysalicylaldehyde (MS) or 4-diethylaminosalicylaldehyde (DS) with α-amino acids (L-phenylalanine (P) and DL-tryptophan (T)) were synthesized. All ligands were analyzed by IR, 1H NMR, 13C NMR and their melting points. Interaction of the obtained azomethine amino ligands with metal salts produced novel nano sized Fe (II) and Cu (II) complexes. The isolated complexes ... إقراء المزيد

2018-09-16 14:17:18 الكلمات المفتاحية amino acid, TGA, Antimicrobial, Gel electrophoresis, Calf thymus DNA, Molecular modeling, Fe(II) chelates, Schiff bases,
Metal based pharmacologically active agents: Synthesis, structural characterization, molecular modeling, CT-DNA binding studies and in vitro antimicrobial screening of iron(II) chelates
In recent years, great interest has been focused on Fe(II) Schiff base amino acid complexes as cytotoxic and antitumor drugs. Thus a series of new iron(II) complexes based on Schiff bases amino acids ligands have been designed and synthesized from condensation of 5-bromosalicylaldehyde (bs) and α-amino acids (l-alanine (ala), l-phenylalanine (phala), l-aspartic acid (aspa), l-histidine (his) and l-arginine (arg)). The ... إقراء المزيد

2018-09-06 07:45:01 الكلمات المفتاحية imines, Structural elucidation, Antimicrobial, Screening, DNA binding, Anticancer efficiency, IR, NMR, TGA,
Development, structural investigation, DNA binding, antimicrobial screening and anticancer activities of two novel quari-dentate VO(II) and Mn (II) mononuclear complexes
Two novel VO(II) and Mn(II) imine chelates derived from the condensation of o-phenylenediamine (PN) with 3-ethoxysalicylaldehyde(ES) were synthesized. The prepared ESPN imine ligand and its chelates were investigated _via_ different analytical and physicochemical tools. Correlation between all the obtained results, the parent ligand behaves as tetra-dentate ONNO ligand and coordinates to Mn(II) and VO(II), in octahedral and square pyramidal geometry, ... إقراء المزيد

2018-09-11 15:03:04 الكلمات المفتاحية Amino acids, Imine, Molecular modeling, Antimicrobial, Antiviral, DNA, IR, TGA, complexes,
Synthesis, structure elucidation, biological screening, molecular modeling and DNA binding of some Cu(II) chelates incorporating imines derived from amino acids
Three tridentate Schiff bases amino acids were prepared by direct condensation of 3-methoxysalicylaldehyde (MS) or 4-diethylaminosalicylaldehyde (DS) with α-amino acid ligands [l-phenylalanine (P), l-histidine (H) and DL-tryptophan (T)]. The prepared Schiff bases amino acids were investigated by melting points, elemental analysis, 1HNMR and 13CNMR, IR, UV–Vis spectra, conductivity and magnetic measurements analyses. Subsequently, copper was introduced and Cu(II) complexes formed. ... إقراء المزيد

2018-09-11 16:36:51 الكلمات المفتاحية Complex, Schiff base, Bio-inorganic chemistry, Catalysis, Antimicrobial, Dyes, Polymers,
A review on versatile applications of transition metal complexes incorporating Schiff bases
Schiff bases and their complexes are versatile compounds synthesized from the condensation of an amino compound with carbonyl compounds and widely used for industrial purposes and also exhibit a broad range of biological activities including antifungal, antibacterial, antimalarial, antiproliferative, anti-inflammatory, antiviral, and antipyretic properties. Many Schiff base complexes show excellent catalytic activity in various reactions and in the presence of ... إقراء المزيد

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