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    Antimicrobial activity of endemic Crataegus tanacetifolia (Lam.) Pers and observation of the inhibition effect on bacterial cells
    (Wiley, 2008) Benli, Mehlika; Yigit, Nazife; Geven, Fatmaguel; Güney, Kerim; Bingöl, Ümit
    Up to now an increasing number of antibiotic-resistant bacteria have been reported and thus new natural therapeutic agents are needed in order to eradicate these pathogens. Through the discovery of plants such as Crataegus tanacetifolia (Lam.) Pets that have antimicrobial activity, it will be possible to discover new natural drugs serving as chemotherapeutic agents for the treatment of nosocomial pathogens and take these antibiotic-resistant bacteria under control. The objective of the present study was to determine antimicrobial activity and the activity mechanism of C. tanacetifolia plant extract. The leaves of C. tanacetifolia, which is an endemic plant, were extracted using methanol and tested against 10 bacterial and 4 yeast strains by using a drop method. It was observed that the plant extract had antibacterial effects on Bacillus subtilis, Shigella, Staphylococcus aureus, and Listeria monocytogenes among the microorganisms that were tested. Minimum inhibitory concentration (MIC) results obtained at the end of an incubation of 24 h were found to be >= 6.16 mg ml(-1) for B. subtilis, <394 mg ml(-1) for Shigella, and >= 3.08 mg ml(-1) for L. monocytogenes and S. aureus and minimum bactericidal concentration (MBC) were found as >= 24.63 mg ml(-1) for B. subtilis, >= 394 mg ml(-1) for Shigella, >= 6.16 mg ml(-1) for L. monocytogenes, and >= 98.5 mg ml(-1) for S. aureus. According to the MBC results, it was found that the plant extract had bactericidal effects and in order to explain the activity mechanism and cell deformation of bacterial strains treated with plant extract, the scanning electron microscopy (SEM) was used. The results of SEM showed that the treated cells appeared shrunken and there was degradation of the cell walls. This study, in which the antibacterial effect of C tanacetifolia was demonstrated, will be a base for further investigations on advanced purification and effect mechanism of action of its active compounds. Copyright (C) 2008 John Wiley & Sons, Ltd.
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    Antimicrobial activity of endemic Digitalis lamarckii Ivan from Turkey
    (Natl Inst Science Communication-Niscair, 2009) Benli, Mehlika; Yiğit, Nazife; Geven, Fatmagül; Güney, Kerim; Bingöl, Ümit
    Antimicrobial activity of the methanolic extracts of leaves and flowers of D. lamarckii Ivan, (Scophulariaceae), an endemic plant species of Turkey, was tested on ten bacterial and four yeast strains. Effective antibacterial activity was observed in four bacterial strains. Minimum inhibitory concentration (MIC) was calculated by use of liquid culture tests and in all the four effective bacterial strains, the MIC was found to be >= 199.5 mg/ml. The minimum bactericidal concentration (MBC) of B. subtilis, S. aureus, and L. monocytogenes was calculated to be >= 199.5 mg/ml, and MBC value for Shigella was calculated as >= 399 mg/ml.
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    Antimicrobial activity of some endemic plant species from Turkey
    (Academic Journals, 2007) Benli, Mehlika; Güney, Kerim; Bingöl, Ümit; Geven, Fatmagül; Yigit, Nazife
    Six plant extracts obtained from different parts such as the leaves, flowers and seeds of four species of the endemic plants in Turkey were tested on a total of 14 microorganisms, 10 of which were bacterial strains and 4 yeast strains. Verbascum eriocarpum (flower) extract was found to be effective against Staphylococcus aureus; Stachys cretica subsp. anatolica (leaf and flower) and Heracleum paphlagonicum (seed) extracts were found to be effective against Bacillus subtilis; and Alcea apterocarpa (seed and sepal) extract was found to be effective against Pseudomonas aeruginosa. No antimicrobial activity was observed in Heracleum paphlagonicum (leaf) and Alcea apterocarpa (leaf) plant extracts. The minimum inhibitory concentration (MIC) values of the plant extracts were calculated to be between >= 0.859 mg/ml and >= 110.5 mg/ml and the minimum bacteriocidal concentration (MBC) values were calculated to be between >= 3.44 mg/ml and >= 132 mg/ml.