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Articles by Omer Varol
Total Records ( 2 ) for Omer Varol
  Aysel Ugur , Mehmet Emin Duru , Ozgur Ceylan , Nurdan Sarac , Omer Varol and Ibrahim Kivrak
  The n-hexane, chloroform, ethyl acetate and ethyl alcohol extracts of the aerial parts of Centaurea ensiformis, endemic to Turkey, have been assessed for antimicrobial and antioxidant activities. The chemical composition of the hexane extract of this plant was determined. The antimicrobial activities on microorganisms, including multiple antibiotic resistant bacteria, were evaluated using the disc diffusion method. The antioxidant activities were determined by using four complementary in vitro assays: inhibition of 2,2-diphenyl-1-picrylhydrazyl radical, total antioxidant activity, and the total amount of phenolic and flavonoid compounds. The structure of the active extract was elucidated by: thin layer chromatography, column chromatography, gas chromatography or gas chromatography-mass spectrometry. The various extracts of C. ensiformis inhibited the growth of tested bacteria. All the C. ensiformis extracts had no effect on the yeasts. The total antioxidant activity increased with the increasing amount of the extracts (20, 40, 80 and 160 μg), which contained linoleic acid emulsion. The major compounds of the hexane extract of the plant were caryophyllene oxide (28.72%), spathulenol (17.81%), eudesmol (13.03%) and β-bourbonene (8.51%).
  Ahmet Zafer TEL , Adem TATLI and Omer VAROL
  This investigation was carried out between 1996 and 2001 in order to research the vegetation of Nemrut Mountain, one of the most important national historical park of Anatolia, on the south-east Taurus (Adyaman-Turkey). Vegetation studies have been carried out according to the Braun-Blanquet’s method. In this study we determined 7 plant associations, 3 sub associations, and 1 plant community, all of which are syntaxa new to science, in 4 different vegetation types. Associations and its higher units are as follows:
Quercetea ilicis Br.-Bl. 1947
Quercetea ilicis Br.-Bl. 1947
Quercion calliprini Zohary 1962
1. Pistacio khynjuki-Cotinetum coggyriae ass. nova
Quercetea pubescentis Doingt, Kraft 1955
Querco-Cedretalia libani Barbero, Loisel & Quezel 1974
2. Astragalo lamarckii-Quercetum brantii ass. nova
Querco-Carpinetalia orientalis Akman, Barbero et Quezel 1980
Quercion frainetto Horvat 1954
3. Lonicero ibericae-Aceretum cinerascentis ass. nova
Astragalo-Brometea Quezel 1973
4. Astragalo compacti-Amygdaletum arabicae ass. nova
5. Helichryso aucheri- Thymetum kotschyani ass. nova
a-) genisto-acantholimetosum acerosi subass. nova
b-) putorio-tanacetetosum amanii subass. nova
c-) helichryso-tanacetetosum argentei subass. nova
6. Verbasco diversifoliae-Astragaletum cephalotis ass. nova
7. Phlomido capitatae-Thymetum migrici ass. nova
8. Centranthus longiflorus community
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