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  • Küçük Resim
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    Antimicrobial Activity of Centaura derderiifolia, Stachys aleurites and Anthemis aciphylla
    (2009) Güven, Kıymet; Karabacak, Ersin; Çelik, Sezgin; Uysal, İsmet
    The antimicrobial activity of the ethanol, aseton, ethyl asetate and chloroform extracts from Centaurea derderiifolia Wagenitz (Asteraceae) , Stachys aleurites Boiss. (Lamiaceae) and Anthemis aciphylla Boiss. var.aciphylla (Asteraceae) were investigated by agar-well diffusion assay. These extracts were tested in vitro against 26 bacterial and 3 yeast species. Etyhl acetate and acetone extracts of C. derderiifolia, S. aleurites and A. a.var. aciphylla showed antimicrobial activity in varying degrees on all the microorganisms tested. However, chloroform and ethanol extracts of all the plants were not active on some microorganisms tested. Ethyl asetate extracts of the samples exhibited stronger and broader spectrum of antimicrobial activity as compared to ethanol, aseton and chloroform extracts. Therefore, minimal inhibitory concentration (MIC) of only ethyl acetate extracts of the samples was determined for seven bacteria chosen from agar-well diffusion assay. MIC values of the extracts were between 250-125 ?g/ml. In conclusion, ethyl asetate extract of C. derderiifolia was the most active against Aeromonas hydrophila both in agar-well diffusion and MIC assays
  • Küçük Resim
    Öğe
    Antimicrobial and Antioxidant Activities of Some Species of Centaurea Collected from Turkey
    (Asian Journal Of Chemistry, 2013) Uysal, İsmet; Çelik, Sezgin; Sağlam, Hüsniye; Güven, Kıymet
    The antimicrobial activity of the ethanol, acetone, ethyl acetate and chloroform extracts from Centaurea persica Boiss., C. polyclada DC. and C. consanguinea DC. (Asteraceae) were investigated by agar-well diffusion assay. All of the extracts exhibited an antimicrobial effect against most of the bacteria and all of the yeasts tested. The plant extracts were also screened for radical scavenging potential using a 1,1-diphenyl-2-picryl-hydrazyl (DPPH) in vitro model system for antioxidant activity. Ethyl acetate extracts showed the most significant inhibitory activity. Therefore, the minimal inhibitory concentration (MIC) of only ethyl acetate extracts of the samples was determined and C. consanguinea showed the highest antimicrobial effect. However, the ethanol extract of C. polyclada at 0.5 mg/ml, concentration displayed the highest antioxidant activity. This activity was followed by ethanol extracts of. C. persica, ethyl acetate extracts of C. polclada, C. persica and C. consanguinea respectively.
  • Küçük Resim
    Öğe
    Ethnobotanical aspects of Kapıdağ Peninsula (Turkey)
    (2010) Uysal, İsmet; Onar, Sinan; Karabacak, Ersin; Çelik, Sezgin
    Türkiye’nin Kuzeybatı Marmara Bölgesi’nde yer alan ve 300 km2 yüzölçümü olan Kapıdağ Yarımadası, Balıkesir ili sınırları içerisindedir. Bu yarımadada 2004-2006 yılları arasında etnobotanik bir çalışma yapıldı. Bu araştırmada, yarımadada bulunan 7 köye ait 119 kaynak kişi ile görüşülmüştür. Bitkilerin kullanımı ile ilgili olarak elde edilen bilgiler değerlendirildiğinde, tıbbi (33 familyaya ait 44 takson), gıda 21 familyaya ait 40 takson), boya (4 familyaya ait 4 takson), yakıt (4 familyaya ait 4 takson), süs (5 familyaya ait 5 takson) ve diğer kullanım amaçları (11 familyaya ait 12 takson) olarak sınıflandırılmıştır. Sonuçta, toplam olarak 47 familyaya ait 88 takson etnobotanik özellikleri açısından değerlendirilmiştir.
  • Küçük Resim
    Öğe
    Pollen studies on some Turkish endemic species of Centaurea L. (Asteraceae)
    (EuroJournals, Inc., 2007) Çelik, Sezgin; Uysal, İsmet; Menemen, Yusuf
    Pollen grains of nine endemic Turkish Centaurea L. were studied by using scanning electron microscope (SEM). The species are: C. spicata Boiss. (Sect: Cynaroides), C. tomentella Hand.-Mazz. (Sect: Cynaroides), C. screlolepis Boiss. (Sect: Cynaroides), C. amonicola Hub.-Mor. (Sect: Cynaroides), C. kurdica Reichardt (Sect: Cynaroides), C. haussknetchii Boiss. (Sect: Cynaroides), C. odyssei Wagenitz (Sect: Pteracantha), C. polyclada DC. (Sect: Acrolophus) and C. consanguinea DC. (Sect: Acrolophus)). The polen grains are tricolporate, prolate to prolate spheroidal, with sparsely or densely distributed spinules ranging from 0.50 to 1.73 ?m height and with irregular pores. P/E ratio in the grains ranges between 1.05 and 1.73. It was determined that the pollen features could be used in separation of some species studied. © EuroJournals Publishing, Inc. 2007.