Yazar "Ozdemir, N." seçeneğine göre listele

Listeleniyor 1 - 4 / 4
  • [ X ]
    Öğe
    A skeletochronological study of the smooth newt Lissotriton vulgaris (Amphibia: Urodela) from an island and a mainland population in Turkey
    (Taylor & Francis Ltd, 2014) Altunisik, A.; Kalayci, T. Ergul; Gul, C.; Ozdemir, N.; Tosunoglu, M.
    To understand the effects of island and mainland on life history traits (e. g. longevity, age at maturity, body size and body mass) of the smooth newt Lissotriton vulgaris (Linnaeus, 1758), we generated data on age and body measurements for an island (Bozcaada) and a mainland (Canakkale) population in northwestern Turkey. Age was determinated by skeletochronology. The maximum life span was 4 years in the island population and 5 years in the mainland population. Age at maturity was estimated to be 2-3 years for both sexes and the populations. While mean snout-venth length (SVL) was calculated as 35.56 mm for females and 31.95 mm for males in the mainland population, it was found to be 32.83 mm for females and 31.78 mm for males in the island population. Females from the mainland population were found to be significantly larger and heavier than those of the island population. A significant positive correlation was found between SVL and age for only males in the mainland population. Unexpectedly, age was not correlated with body size for the island individuals. Since there were hardly any demographic studies on any Urodela species comparing island and mainland populations, in this paper we contribute to the literature on this subject.
  • [ X ]
    Öğe
    AGE STRUCTURE OF THE CAUCASIAN AGAMA (Paralaudakia caucasia) FROM ELMADAG, IGDIR, TURKEY: PRELIMINARY DATA FROM SMALL SAMPLE SIZE
    (Folium Publ Co, 2017) Kalayci, Ergul T.; Altunisik, A.; Gul, C.; Tosunoglu, M.; Ozdemir, N.
    Life history traits of lizard species, including agamid species, generally involve male-larger body size, but age of these species has not adequately been examined in each cohort. We thus conducted a skeletochronological study using 16 preserved specimens of Paralaudakia caucasia (8 males, 6 females, and 2 juveniles) captured from Elmadag, Igdir, Turkey. Mean snout-vent length was slightly but insignificantly larger in males (120.2 mm) than in females (115.9 mm). Maximum longevity was 10 years in males and 6 years in females. No significant difference in age structure was found between the sexes. Juveniles were 2-year old young. Mean age was 7.12 years for males and 5.33 years for females. Sexually matured individuals were found at the end of the second or third years (i.e., first reproduction occurred at 3 - 4 years). A positive correlation was detected in age and body size in both sexes, as has previously been shown in other lizard species. Our finding of age structure in P. caucasia would contribute to our understanding of life-history trait variations among lizard species.
  • [ X ]
    Öğe
    Copper(II) and cobalt(II) complexes of 2,6-diacetylpyridine bis(O-methyloxime): A theoretical investigation
    (Pleiades Publishing Inc, 2012) Ozdemir, N.; Dayan, O.; Dincer, M.; Cetinkaya, B.
    The molecular geometries and vibrational frequencies of the title compounds in the ground state are calculated using the Hartree-Fock (HF) and density functional theory (DFT/B3LYP) methods with the LANL2DZ basis set and compared with the experimental data. The calculated results show that the optimized geometries can well reproduce the crystal structural parameters, and the theoretical vibrational frequencies show good agreement with the experimental values. The energetic behavior of the title compounds in solvent media is examined using the B3LYP method with the LANL2DZ basis set by applying the Onsager and polarizable continuum model (PCM). In addition, molecular electrostatic potential (MEP) and frontier molecular orbital (FMO) analyses of the title compounds are investigated by theoretical calculations.
  • [ X ]
    Öğe
    Single crystal ruthenium(II) complex dye based photodiode
    (Elsevier Sci Ltd, 2016) Tataroglu, A.; Dayan, O.; Ozdemir, N.; Serbetci, Z.; A-Ghamdi, Ahmed A.; Dere, A.; El-Tantawy, Farid
    The electrical and photoresponse properties of Ruthenium(II) complex dye based on photodiode were analyzed by current, capacitance and conductance measurements performed in a wide illumination intensity and frequency range. It was observed that the reverse current increases with increasing illumination intensity. The results confirm that the photodiode exhibits a photoconducting behavior. Also, the transient photocurrent, photocapacitance and photoconductance of the photodiode were investigated as a function of time. It was observed that the values of these parameters increase after illuminating and reach back to original value after turning off the illumination. In addition, the interface states and series resistance of the photodiode were determined from capacitance/conductance voltage measurements. The value of these parameters decreases with increasing frequency. The obtained experimental results suggest that the photodiode with Ruthenium/Ru(II) complex thin film could be used in various optoelectronic devices and applications. (C) 2016 Elsevier Ltd. All rights reserved.