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    Wyświetlanie 1-2 z 2
    Tytuł:
    Generalized thermal microstretch elastic solid with harmonic wave for mode-I crack problem
    Autorzy:
    Lotfy, Khaled
    El-Bary, Alaa Abd
    Allan, Mohamed
    Ahmed, Marwa H.
    Powiązania:
    https://bibliotekanauki.pl/articles/240363.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    mode-I crack
    L-S theory
    GL theory
    thermoelasticity
    microrotation
    microstretch
    Opis:
    A general model of the equations of generalized thermo-microstretch for an infinite space weakened by a finite linear opening mode-I crack is solved. Considered material is the homogeneous isotropic elastic half space. The crack is subjected to a prescribed temperature and stress distribution. The formulation is applied to generalized thermoelasticity theories, using mathematical analysis with the purview of the Lord-Şhulman (involving one relaxation time) and Green-Lindsay (includes two relaxation times) theories with respect to the classical dynamical coupled theory (CD). The harmonic wave method has been used to obtain the exact expression for normal displacement, normal stress force, coupled stresses, microstress and temperature distribution. Variations of the considered fields with the horizontal distance are explained graphically. A comparison is also made between the three theories and for different depths for the case of copper crystal.
    Źródło:
    Archives of Thermodynamics; 2020, 41, 2; 147-168
    1231-0956
    2083-6023
    Pojawia się w:
    Archives of Thermodynamics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Antibiotic resistance and siderophores production by clinical Escherichia coli strains
    Autorzy:
    Khazaal, Mohamed T.
    El-Hendawy, Hoda H.
    Mabrouk, Mona I.
    Faraag, Ahmed H.I.
    Bakkar, Marwa R.
    Powiązania:
    https://bibliotekanauki.pl/articles/16648088.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czasopisma i Monografie PAN
    Tematy:
    siderophores
    Escherichia coli
    clinical strains
    antibiotic susceptibility
    Opis:
    The phenomenon of antibiotic resistance has dramatically increased in the last few decades, especially in enterobacterial pathogens. Different strains of Escherichia coli have been reported to produce a variety of structurally different siderophores. In the present study, 32 E. coli strains were collected from different clinical settings in Cairo, Egypt and subjected to the antibiotic susceptibility test by using 19 antibiotics belonging to 7 classes of chemical groups. The results indicated that 31 strains could be considered as extensively drug-resistant and only one strain as pan drug-resistant. Siderophores production by all the tested E. coli strains was determined qualitatively and quantitatively. Two E. coli strains coded 21 and 49 were found to be the most potent siderophores producers, with 79.9 and 46.62%, respectively. Bacterial colonies with cured plasmids derived from strain 49 showed susceptibility to all the tested antibiotics. Furthermore, E. coli DH5α cells transformed with the plasmid isolated from E. coli strain 21 or E. coli strain 49 were found to be susceptible to ansamycins, quinolones, and sulfonamide groups of antibiotics. In contrast, both plasmid-cured and plasmid-transformed strains did not produce siderophores, indicating that the genes responsible for siderophores production were located on plasmids and regulated by genes located on the chromosome. On the basis of the obtained results, it could be concluded that there is a positive correlation between antibiotic resistance, especially to quinolones and sulfonamide groups, and siderophores production by E. coli strains used in this study.
    Źródło:
    BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology; 2022, 103, 2; 169-184
    0860-7796
    Pojawia się w:
    BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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