Yazar "Usta, Asu" için listeleme
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Composition and antimicrobial activity of essential oil from the flower of Rhododendron luteum Sweet
Usta, Asu; Yaylı, Büşra; Kahrinman, Nuran; Karaoğlu, Şengül Alpay; Yaylı, Nurettin (Chemical Publishing Co., 2012)Essential oil from air-dried flower of Rhododendron luteum Sweet (Ericaceae), was obtained by hydrodistillation in a Clevenger-type apparatus and analyzed by GC-MS and GC-FID. Sixty-four components were identified in the ... -
Diastereoselective synthesis, characterization, investigation of anticancer, antibacterial activities, in silico approaches and DNA/BSA binding affinities of novel pyrimidine-sugar derivatives
Kahriman, Nuran; Serdaroğlu, Vildan; Aydın, Ali; Türkmenoğlu, Burçin; Usta, Asu (Elsevier, 2023)Eighteen novel carbohydrate conjugates (1-9) and their tetra-O-acetyl derivatives (10-18) were synthesized in total and evaluated for their biological properties, including antimicrobial and anticancer functions, and ... -
Microwave-assisted preparation of azachalcones and their N-alkyl derivatives with antimicrobial activities
Usta, Asu; Öztürk, Elif; Beriş, Fatih Şaban (Taylor & Francis Ltd, 2014)Two new azachalcones were prepared by both Claisen-Schmidt condensation and a simple environmentally trendy microwave-assisted method. Ten new N-alkyl (C-6,C-8,C-10,C-12,C-14)-substituted azachalconium bromides (3a-e, 4a-e) ... -
Microwave-assisted synthesis of some 1H-1,2,4-triazol-3-one derivatives
Karaali, Nesrin; Menteşe, Emre; Yılmaz, Fatih; Usta, Asu; Kahveci, Bahittin (Bureau Scientific Publ, 2013)4-Amino-5-(methyl/ethyl)-2,4-dihydro-3H-1,2,4-triazol-3-one were synthesized from the reaction of (methyl/ethyl)-ester ethoxycarbonyl hydrazone with hydrazine hydrate and then, converted to corresponding Schiff bases using ... -
Natural infection potential and efficacy of the entomopathogenic fungus Beauveria bassiana against Orosanga japonica (Melichar)
Akıner, Muhammet Mustafa; Öztürk, Murat; Güney, İbrahim; Usta, Asu (Springer, 2020)In this study, potential of the entomopathogenic fungi (EPF) isolates from dead samples of Orosanga japonica (Melichar) (Hemiptera: Ricaniidae) was evaluated. Infected specimens with fungi results confirmed that the samples ... -
New pyrimidine-N-β-D-glucosides: synthesis, biological evaluation, and molecular docking investigations
Kahriman, Nuran; Peker, Kıvanç; Serdaroğlu, Vildan; Aydın, Ali; Türkmenoğlu, Burçin; Usta, Asu; Yaylı, Nurettin (Scientific Technical Research Council Turkey, TÜBİTAK, 2023)In this study, syntheses of new pyrimidine-coupled N-beta-glucosides and tetra-O-acetyl derivatives were carried out. All glycoconjugates were investigated in comparison with known chemotherapeutic agents in terms of their ... -
Novel 2-amino-4-aryl-6-pyridopyrimidines and N-alkyl derivatives: Synthesis, characterization and investigation of anticancer, antibacterial activities and DNA/BSA binding affinities
Kahriman, Nuran; Peker, Kıvanç; Serdaroğlu, Vildan; Aydın, Ali; Usta, Asu; Fandaklı, Seda; Yaylı, Nurettin (Academic Press Inc Elsevier Science, 2020)A series of new 2-amino-4-aryl-6-pyridopyrimidines, and their N-alkyl bromide derivatives were designed and synthesized by employing methyl substituted azachalcones. These novel compounds were evaluated and compared to the ... -
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 and antimicrobial properties of N-substituted derivatives of (E)-2 ',3 ''-thiazachalcones
Usta, Asu; Taşkıran, Hacer (Walter de Gruyter Gmbh, 2015)N-alkyl substituted 2',3 ''-thiazachalcones {3-[(1E)-3-(4-methylthiophene-2-yl)-3-oxoprop-1-en-1-yl]-1-alkyl (C-5-12,C-14) pyridinium bromides} were synthesized by a two-step reaction. the newly synthesized compounds were ... -
Synthesis and biological evaluation of new 2,4,6-trisubstituted pyrimidines and their N-alkyl derivatives
Kahriman, Nuran; Serdaroğlu, Vildan; Peker, Kıvanç; Aydın, Ali; Usta, Asu; Fandaklı, Seda; Yaylı, Nurettin (Academic Press Inc Elsevier Science, 2019)A series of new 2,4,6-trisubstituted pyrimidines and their N-alkyl bromide derivatives were prepared based upon methoxy substituted azachalcones as the starting materials. All newly synthesized compounds were screened for ... -
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 of some new benzimidazole derivatives with their antioxidant activities
Usta, Asu; Yılmaz, Fatih; Kapucu, Gülbahar; Baltaş, Nimet; Menteşe, Emre (Bentham Science Publ Ltd, 2015)In this paper, some benzimidazole derivatives containing salicyl, oxadiazole, thiosemicarbazide and 1, 2, 4-triazole moieties have been synthesized and screened their antioxidant activities screened. Antioxidant activities ... -
Synthesis of some novel pyrazoline and pyrazole derivatives as potential in vitro anti-xanthine oxidase and antioxidant activities
Usta, Asu; Baltaş, Nimet; Özkan, Mahmut (Editura Acad Romane, 2018)2-Pyrazolines and 2-pyrazole, electron-rich nitrogen containing heterocyclic systems, play an important role in several biological and pharmacological activities. in this paper, we report the synthesis of novel ... -
Synthesis, antibacterial and antioxidant activities of some new nsubstituted azachalcone, schiff base and pyrazole derivatives
Çalışkan, Nedime; Usta, Asu; Beriş, Fatih Şaban; Baltaş, Nimet; Çelik, Efsun (Bentham Science Publ Ltd, 2020)Pyrazoles, Schiff bases and the quaternary ammonium compounds (QAC) such as N-alkyl substituted azachalcones are the important group of chemical individuals with widespread usage in many fields of science. in particular, ... -
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 ... -
Toxic efficacy of Cuscuta campestris Yunck. (Solanales: Convolvulaceae) and Lupinus albus L. (Fabales: Fabaceae) plant crude extracts against nymphs and adults of Orosanga japonica (Melichar, 1898) (Hemiptera: Ricaniidae) under laboratory conditions
Akıner, Muhammet Mustafa; Kılıçkaya Selvi, Emine; Öztürk, Murat; Güney, İbrahim; Usta, Asu (Entomological Society of Turkey, 2021)The planthopper, Orosanga japonica (Melichar, 1898) (Hemiptera: Ricaniidae), is an important agricultural pest of grapevine, kiwifruit and tea in Asia and in some countries of Eastern Europe. The efficacy of the crude ... -
Volatile constituents and antimicrobial activities from flower and fruit of arbutus unedo L.
Kahriman, Nuran; Albay, Canan Güleç; Doğan, Neşe; Usta, Asu; Karaoğlu, Şengül Alpay; Yaylı, Nurettin (2010)Essential oils isolated by hydrodistillation from flower and fruit of Arbutus unedo growing in Turkey were analyzed by GC and GC/MS. Forty-nine compounds, representing around 95% of the total oils were identified. ...
