Yazar "Cakmak, Oezlem" seçeneğine göre listele

Listeleniyor 1 - 3 / 3
  • [ X ]
    Öğe
    Effects of sowing periods and P application rates on yield and oil composition of black cumin (Nigella sativa L.)
    (Wfl Publ, 2008) Kizil, Sueleyman; Kirici, Saliha; Cakmak, Oezlem; Khawar, Khalid Mahmood
    The study reports effects of winter and spring sowings and 0, 40, 80, 120 and 160 kg ha(-1) triple super phosphate (P) application on yield, yield components and fatty acid composition of black cumin during 2003-2004 and 2004-2005 at Diyarbakir, Turkey. The fatty acid methyl esters (FAMEs) were extracted from the reaction vials with hexane. The GC (gas chromatography) analysis was carried out by means of a Varian 3400 apparatus equipped with Supelcowax-10 fused silica capillary column. The results showed that vegetative growth period was the major and meteorological conditions and P doses were the minor factors controlling yield components; such that winter sowing resulted in maximum seed yield (1037 to 1534 kg ha-1), fatty oil content (30.2 to 37.9%) and essential oil content (0.31 to 0.56%). Major constituents of fatty oil were determined as linoleic, palmitic and oleic acid. The percentage of linoleic acid was determined between 43.34 and 51.50%.
  • [ X ]
    Öğe
    Microelement Contents and Fatty Acid Compositions of some Isatis Species Seeds
    (Univ Agr Sci & Veterinary Med Cluj-Napoca, 2009) Kizil, Sueleyman; Turk, Murat; Cakmak, Oezlem; Ozguven, Mensure; Khawar, Khalid Mahmood
    Isatis species are important biennial, herbaceous shrubs represented by 40 taxa, of which 24 are endemic to Turkey. The chemical compounds found in leaves and roots of all Isatis species have medicinal properties and arc used for treatment of a wide range of disorders. No study reports seed characteristics, microelement contents and fatty acid compositions of the seeds of any Isatis species except I. tinctoria. Therefore the study was carried out to find seed fatty oil, fatty acid compositions protein content, characteristics, and microelement contents of I. aucheri, I. cochlearis, I. constricta, I. demiriziana (endemic), I glauca and I. lusitanica. The results showed fatty oil and protein content of these species in range of 2 to 10% and 16.07 to 25.17%, respectively. Furthermore, these seeds were rich in microelements Al, Ca, Fe, K, Mg, Na and P. Major fatty oil components of these species were determined as erucic, oleic, linoleic and linolenic acid; such that erucic acid content of these species ranged 16.94 to 30.52%.
  • [ X ]
    Öğe
    Seasonal changes in fatty acid composition of Eysarcoris inconspicuous (Herrich-Schaffer, 1844) (Heteroptera: Pentatomidae) adults
    (Entomological Soc Turkey, Ege Univ, 2010) Cakmak, Oezlem
    The goal of the study was to investigate the role of phospholipid and triacylglycerol fatty acid compositional changes in Eysarcoris inconspicuous (Herrich-Schaffer, 1844) (Heteroptera: Pentatomidae) with respect to seasonal changes. E. inconspicuous adults were collected from Diyarbakir, Turkey in 2007-2008. The fatty acid compositions of phospholipid and triacylglycerol fractions that were extracted from whole-body of adult E. inconspicuous were isolated and analyzed using gas chromatography and gas chromatography-mass spectrometry. Qualitative analysis has revealed the presence of 15 fatty acids during most of the months. The major components were C16 and C18 saturated and unsaturated components which are ubiquitous in most animal species. In addition to these components, three odd-chain (C13:0), (C15:0), (C17:0), and prostaglandin precursor fatty acids were found. The fatty acid profiles of phospholipids and triacylglycerols have some diferences. In contrast to triacylglycerol fraction, linolenic acid and C20 polyunsaturated fatty acids increased during autumn and winter in phospholipid fraction were detected. The unsaturated fatty acid to saturated fatty acid ratio significantly increased in both fractions but the increase was dramatic in phospholipid fraction during autumn, and reaches its maximum level in january and february, when outdoor temperatures are low. Thus, temperature seems to play an important role in seasonal variation of lipid metabolism of E. inconspicuous. Preventing cellular damage due to low temperatures is a major challenge for insects. These findings indicate that E. inconspicuous can modify its fatty acid composition in response to changes in environmental conditions.