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: Amino acids

2019-01-24 12:28:42 الكلمات المفتاحية Hydrogen peroxide, Amino acids, Schiff base,
Novel mechanistic aspects on the reaction between low spin Fe(II) Schiff base amino acid complexes and hydrogen peroxide—Spectrophotometric tracer of intraperoxo intermediate catalyzed reaction
The kinetics and mechanism of the reaction of hydrogen peroxide with some Fe(II) Schiff base complexes were investigated spectrophotometrically in aqueous solution at pH 8 and 35 °C under pseudo-first-order conditions. The used ligands were derived from salicylaldehyde or _o_-hydroxynaphthaldehyde and some amino acids (l-leucine, l-iso-leucine, l-serine, l-methionine and dl-tryptophan). It was found that the formation of the purple interaperoxo ... إقراء المزيد

2018-11-22 14:16:13 الكلمات المفتاحية Antimicrobial activity, DNA interaction, Amino acids, Catalytic activity, Copper(II), TGA, IR,
Complexation of Schiff bases incorporating of Salicylaldehyde Derivatives and Amino Acids to Copper(II) as an effective strategy for antimicrobial activity improvement, DNA Interaction and catalytic activity
Five Cu(II) complexes are tridentate Schiff bases amino acids ligands derived from condensation 3–methoxysalicylaldehyde (MS) or 4-diethylaminosalicylaldehyde (DS) with α-amino acids (L-phenylalanine(P), L-histidine (H), DL-tryptophane (T)). All ligands are analyzed by 1HNMR and 13CNMR. The investigated complexes have been prepared and characterized by elemental analysis, infrared spectra, ultraviolet-visible and thermal analysis in dynamic air atmosphere (40ml / min) at a ... إقراء المزيد

2018-11-28 19:49:39 الكلمات المفتاحية bromosalicylidine chelates, Amino acids, Fe(II),
Kinetic investigation of hydroxide ion attack at high spin Fe(II) bromosalicylidine chelates with amino acids in binary aqueous solvents: Initial and transition state analysis
We have investigated the kinetics of hydroxide ion attack at iron(II) chelates with 5-bromosalicylidene derivatives of amino acids (alanine, phenylalanine, aspartic acid, histidine, and arginine) in binary aqueous mixed solvents at 298 K. The observed reactivity trends are discussed in connection with the complexes hydrophobicity/hydrophilicity, transfer chemical potentials of hydroxide ion and the complex, and the solvent effects. إقراء المزيد

2018-10-29 12:31:12 الكلمات المفتاحية Green Synthesis, Trizole, Amino acids, Ligands, Transition Metal Complexes,
Green Synthesis of new Trizole Based Heterocyclic Amino Acids Ligands and their Transition Metal Complexes. Characterization, Kinetics, Antimicrobial and Docking Studies.
Green Synthesis of new Trizole Based Heterocyclic Amino Acids Ligands and their Transition Metal Complexes. Characterization, Kinetics, Antimicrobial and Docking Studies. إقراء المزيد

2018-10-22 20:08:37 الكلمات المفتاحية Bronze, protective coating, BTA, Amino acids,
Assessment of Some Corrosion Inhibitors and protective coatings for protection of bronze artifacts
Preventive conservation is one of the most important processes used for saving artifacts. The corrosion inhibitors and protective coatings are highly recommended for protecting metals from degradation and corrosion process. This research focuses on laboratory tests of five corrosion inhibitors and protective coatings on Bronze samples in order to measure the efficiency of these materials to be applied on Bronze ... إقراء المزيد

2018-09-24 07:53:43 الكلمات المفتاحية Berthellina citrina, Lethal effects, Amino acids, Antimicrobial activity, Cytotoxic activity,
Toxicological and Biological Activities of the Acid Secretion of Berthellina citrina (Heterobranchia, Pleurobranchidae) from the Red Sea
_Berthellina citrina _is a pleurobranchid opisthobranch characterized by its skin acid-secretion that contains sulphate and chloride ions with traces of organic matter. To identify defensive potential and bioactivity, we tested this secretion for the first time against _Artemia salina_, different strains of microorganisms, human RBCs and human cancer cell lines. It showed lethality to _A. salina _with LC50 values 83.86 ... إقراء المزيد

Reactivity Trends and Kinetic Inspection of Hydroxide Ion Attack and DNA Interaction on Some Pharmacologically Active Agents of Fe(II)  Complexes at Different Temperatures
The reactivity of few novel high‐spin Fe(II) complexes of Schiff base ligands derived from 2‐hydroxynaphthaldehyde and some variety of amino acids with the OH− ion has been examined in an aqueous mixture at the temperature range from 10 to 40°C. Based on the kinetic investigations, the rate law and a plausible mechanism were proposed and discussed. The general rate equation ... 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 16:22:26 الكلمات المفتاحية Intercalation, Calf thymus DNA, Cu(II) chelates, Schiff base, Amino acids,
Tailoring, physicochemical characterization, antibacterial and DNA binding mode studies of Cu(II) Schiff bases amino acid bioactive agents incorporating 5-bromo-2-hydroxybenzaldehyde
Five novel Cu(II) complexes derived from the condensation between 5-bromosalicylaldehyde (bs) and α-amino acids (L-alanine, l-phenylalanine, L-aspartic acid, L-histidine and L-arginine) were synthesized and characterized by their elemental analyses, thermogravimetric analysis, IR, mass and electronic spectra, conductance and magnetic measurements. Moreover, the stoichiometry and the stability constants of the prepared complexes have been determined spectrophotometrically using continuous variation and molar ... إقراء المزيد

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