Yazar "Yaşar, Ahmet" için listeleme
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Antimicrobial activity and essential oil compositions of two Ranunculus species from Turkey: R. constantinopolitanus and R. arvensis
Terzioğlu, S.; Yaşar, Ahmet; Yaylı, Nuran; Yılmaz, Nagihan; Karaoğlu, Şengül Alpay; Yaylı, Nurettin (2008)The isolated essential oils of Ranunculus constantinopolitanus and Ranunculus arvensis were tested for antimicrobial activity against the bacteria E. coli, K. pneumoniae, P. aeruginosa, E. faecalis, S. aureus, B. cereus ... -
Chemical composition and antimicrobial activity of essential oils from Centaurea appendicigera and Centaurea helenioides
Yaylı, Nurettin; Yaşar, Ahmet; Yaylı, Nuran; Albay, Canan; Aşamaz, Yaprak; Coşkunçelebi, Kamil; Karaoğlu, Şengül (Taylor & Francis LTD., 2009)The chemical components and antimicrobial activity of the essential oils from Centaurea appendicigera C. Koch and Centaurea helenioides Boiss, two different endemic members of the genus Centaurea L. (Asteraceae), were ... -
The chemical composition of the essential oil, SPME and antimicrobial activity of rhododendron caucasicum pall
Fandaklı, Seda; Yaylı, Nurettin; Kahriman, Nuran; Uzunalıoğlu, Emel; Çolak, Nevin Ulaş; Yıldırım, Sercan; Yaşar, Ahmet (2019)The aim of this research was to investigate the effect of different extraction methods and chemical composition of the essential oil and solid-phase microextraction (SPME) from Rhododendrum caucasium Pall. The volatiles ... -
Chemical constituents and antimicrobial activities of the essential oils from Sedum pallidum var. bithynicum and S. spurium grown in Turkey
Yaylı, Nuretin; Yaşar, Ahmet; İskender, Nagihan Yılmaz; Yaylı, Nuran; Cansu, Tayyibe Beyza; Coşkunçelebi, Kamil; Karaoğlu, Şengül Alpay (Taylor&Francis LTD., 2010)Chemical compositions of the essential oil of Sedum pallidum Bieb. var. bithynicum (Boiss.) and S. spurium Bieb. (Crassulaceae) from Turkey were investigated by GC-MS, and antimicrobial activity of the oil samples were ... -
Comparative essential oil analysis of Calendula arvensis L. extracted by hydrodistillation and microwave distillation and antimicrobial activities
Tosun, Gonca; Yaylı, Büşra; Arslan, Tayfun; Yaşar, Ahmet; Karaoğlu, Şengül Alpay; Yaylı, Nurettin (2012)The present study was to investigate the influence of the extraction methods on yield and chemical composition of the essential oil of Calendula arvensis L. The volatiles of C. arvensis have been isolated by hydrodistillation ... -
Essential oil composition, antimicrobial and antioxidant activities of Salvia staminea
Çolak, Nevin Ulaş; Yıldırım, Sercan; Bozdeveci, Arif; Yaylı, Nurettin; Çoşkunçelebi, Kamil; Fandaklı, Seda; Yaşar, Ahmet (2018)Volatile constituents of the essential oil which was obtained by hydrodistillation (HD) in a Clevengertype apparatus from the air-dried Salvia staminea Montbret & Aucher ex Bentham (Lamiaceae) collected from Bayburt (North ... -
Microwave-assisted synthesis of 4′-azaflavones and their n-alkyl derivatives with biological activities
Yaşar, Ahmet; Akapınar, Kurtuluş; Burnaz, Nesibe Arslan; Küçük, Murat; Karaoğlu, Şengül Alpay; Doğan, Neşe; Yaylı, Nurettin (Wiley, 2008)4?-Azaflavone (=2-(pyridin-4-yl)-4H-1-benzopyran-4-one; 4) and 3-[(pyridin-4-yl)methyl]-4?-azaflavone (5) were synthesized by a simple environmentally friendly microwave-assisted one-pot method through the cyclization of ... -
Photochemistry of nitro-substituted (E)-2-azachalcones with theoretical calculations and biological activities
Yaylı, Nurettin; Üçüncü, Osman; Yaşar, Ahmet; Yaylı, Nuran; Burnaz, Nesibe Arslan; Karaoǧlu, Şengül Alpay; Küçük, Murat (Elsevier, 2009)Four new stereoselective dimerization products (4a-c, 5) of m- and p-nitro-substituted (E)-2-azachalcones (2 and 3) were synthesized and tested for antimicrobial and antioxidant activities. Compounds 1-3 showed very good ... -
Photodimerizations of hydroxy- and benzoylated 4-azachalcones and quantum chemical investigation of the reactions
Yaşar, Ahmet; Yaylı, Nuran; Usta, Asu; Yaylı, Nurettin (Springer Link, 2010)Photodimerization reactions of compounds 4-6 gave four new cyclobutane-containing compounds (7-9) with full control over the stereochemistry at the four stereogenic centers. These new cyclobutane- containing compounds had ... -
Synthesis of methyl (E)-2′,4″-thiazachalcones and their N-alkyl derivatives, photochemistry with theoretical calculations and antimicrobial activities
Usta, Asu; Yaşar, Ahmet; Yaylı, Nuran; Karaoğlu, Şengül Alpay; Yaylı, Nurettin (TUBİTAK, 2009)A series of 9 new (E) -thiazachalcones (1-3), and their N -alkyl substituted derivatives (4-6), and stereoselective dimerization products (7-9) were synthesized, then tested for antimicrobial activity against all test ... -
Synthesis, Configuration, and Antimicrobial Properties of Novel Substituted and Cyclized ‘2′,3″-Thiazachalcones’
Usta, Asu; Yaşar, Ahmet; Yılmaz, Nagihan; Güleç, Canan; Yaylı, Nuran; Karaoğlu, Şengül Alpay; Yaylı, Nurettin (Wiley, 2007)Nine new thiazachalcone-based drugs, compounds 1-9, were prepared and fully characterized. The configurations of the photochemical-dimerization products 7-9 were rationalized by semi-empirical calculations. Both the ...
