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Wyszukujesz frazę "Mohamed, E. M." wg kryterium: Autor

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    Wyświetlanie 1-5 z 5
    Tytuł:
    Minerals content, essential oils composition and physicochemical properties of Citrus jambhiri Lush. (Rough Lemon) from the Sudan
    Autorzy:
    Mohammed, A. M. H.
    Ibrahim, M. A
    Omran, A. A.
    Mohamed, E. M.
    Elsheikh, S. E. M.
    Powiązania:
    https://bibliotekanauki.pl/articles/412508.pdf
    Data publikacji:
    2013
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Citrus jambhiri
    Rutaceae
    atomic absorption spectroscopy (AAS)
    Flame Atomic Emission Spectroscopy (FAES)
    metal content
    essential oils
    Opis:
    Minerals content of Citrus jambhiri (rough lemon) fruit was qualitatively and quantitatively analyzed using atomic absorption spectroscopy (AAS) and flame atomic emission spectrometry (FAES). The peel, moisture and ash contents of rough lemon were found to be 18.35 %, 23.75 % and 2.04 % respectively. Vitamin C (ascorbic acid) of rough lemon juice was found to be 70.0 mg/100 g. The chemical composition of essential oil of rough lemon peel was determined. The major compound was found to be limonene (84.5 %) followed by sabinene, β-myrcene, α-terpineol, 1,3-tetradecadiene and linalool.
    Źródło:
    International Letters of Chemistry, Physics and Astronomy; 2013, 9, 1; 25-30
    2299-3843
    Pojawia się w:
    International Letters of Chemistry, Physics and Astronomy
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Theoretical Inversion of Amino Acids (Alanine and Aspartic Acid) by Semi-empirical Methods
    Autorzy:
    Mohamed, M. E.
    Powiązania:
    https://bibliotekanauki.pl/articles/412336.pdf
    Data publikacji:
    2013
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    inversion
    alanine
    aspartic
    semi-empirical methods
    AM1
    Opis:
    The inversion reaction coordinate of free amino acids (alanine, aspartic acid) have been computationally calculated by semi-empirical methods AM1. A transition state for free alanine and aspartic acid were obtained as a three membered ring in which the α-C-H and α-C-CH3 are slightly elongated, 1.2 and 2.17 Å respectively in the alanine transition state. The activation energy of alanine is 77.52 kcal/mol in the gas phase and 76.66 kcal/mol in aqueous phase, and for aspartic acid is 54.87 kcal/mol in the gas phase and 50.86 kcal/mol in aqueous phase.
    Źródło:
    International Letters of Chemistry, Physics and Astronomy; 2013, 7, 1; 37-44
    2299-3843
    Pojawia się w:
    International Letters of Chemistry, Physics and Astronomy
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Synthesis and Spectroscopic Characterization of l-aspartic Acid Complexes with Metals of the Lanthanides Family
    Autorzy:
    Mohamed, M. E.
    Powiązania:
    https://bibliotekanauki.pl/articles/412075.pdf
    Data publikacji:
    2013
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    L-aspartic acid
    Lanthanides (III) complexes
    IR and NMR
    Opis:
    The complexes between l-aspartic acid and metals of lanthanide series (La3+, Pr3+, Eu3+, Gd3+) have been prepared and characterized using a variety of techniques including, infrared spectroscopy, 1H NMR, 13C NMR, elemental analysis and metal contents. The sought metal effect on the electronic environment of the chiral carbon and its neighbouring atoms was observed in case of Europium and Praseodymium. The 13C downfield shift indicates a lower electron density at the carbon with consequent downfield shift observed on the ?-H attached to it increasing its acidity.
    Źródło:
    International Letters of Chemistry, Physics and Astronomy; 2013, 6; 91-115
    2299-3843
    Pojawia się w:
    International Letters of Chemistry, Physics and Astronomy
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Experimental and Computational Vibration Study of Amino Acids
    Autorzy:
    Mohammed, M. E.
    Mohamed, A. M. A.
    Powiązania:
    https://bibliotekanauki.pl/articles/412478.pdf
    Data publikacji:
    2013
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Vibrational studies
    Amino Acids
    semi-empirical methods (PM6 and RM1)
    ab initio methods (B3LYP/6-31+G(d)
    Opis:
    Vibrational studies of amino acids experimentally and theoretically have been performed. The Semi-empirical methods optimization by PM6 and RM1 on the l- and d-amino acids (alanine, phenylalanine, aspartic and glutamic acid), showed no difference in energy between l-and d-isomers. The vibrational frequencies were calculated by semi-emprical methods (PM6 and RM1) and ab initio methods (B3LYP/6-31+G(d) and were scaled down by factors of 0.925 (RM1), 1.09 (PM6) and 0.89 (B3LYP/6-31+G(d)). The calculated and experimental vibrational frequencies have shown good general agreement.
    Źródło:
    International Letters of Chemistry, Physics and Astronomy; 2013, 10, 1; 1-17
    2299-3843
    Pojawia się w:
    International Letters of Chemistry, Physics and Astronomy
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Inhibition of Brass Corrosion in Acid Medium Using Thiazoles
    Autorzy:
    Taha, K. K.
    Mohamed, M. E.
    Khalil, S. A.
    Talab, S. A.
    Powiązania:
    https://bibliotekanauki.pl/articles/411634.pdf
    Data publikacji:
    2013
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Benzothiazoles
    Brass Corrosion Inhibitors
    Perchloric Acid
    Opis:
    Brass as an alloy composed mainly of copper is great industrial uses such as heat exchangers and similar other facility due to its good thermal properties. Due to the presence of the considerable ratio of zinc the alloy suffers from zinc dissolution or dezincification. Dezincification rate increases with the increase in the ratio of zinc in the alloy. In this study benzothiazole (BTH) and its substituent’s 2-methylbenzothiazole (MeBTH), 2-aminobenzothiazole (ABTH), 2-mercaptobenzothiazole (MBTH) and 2-phenylbenzothiazole (PhBTH) have been used as corrosion inhibitors for α-brass in stirred 0.1 M HClO4. The methods of investigation include weight loss, Tafel and linear polarizations and electrochemical impedance spectroscopy. The order of inhibition efficiency (% E) was calculated and the values obtained has indicated the sequence of inhibition efficiency was found to be BTH < MeBTH < ABTH < PhBTH < MBTH. The calculated values of thermodynamic parameters support this order. The inhibitors were found to suppress the corrosion rate by the formation of films which were identified by IR, SEM and EDAX techniques.
    Źródło:
    International Letters of Chemistry, Physics and Astronomy; 2013, 9, 2; 87-102
    2299-3843
    Pojawia się w:
    International Letters of Chemistry, Physics and Astronomy
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-5 z 5

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