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Öğe AFLP analysis of genetic diversity in Turkish green plum accessions (Prunus cerasifera L.) adapted to the Mediterranean region(Elsevier Science Bv, 2007) Ayanoglu, H.; Bayazit, S.; Inan, G.; Bakir, M.; Akpinar, A. E.; Kazan, K.; Erguel, A.The Anatolian region of Turkey with many ecogeographical locations harbours a rich but genetically uncharacterized plum germplasm. in this study, the genetic diversity in economically important green plums (Prunus cerasifera) grown in the Mediterranean region of Turkey was assessed using the amplified fragment length polymorphism (AFLP) analysis. Overall, a relatively low genetic diversity with AFLP genetic similarity values ranging from 0.829 to 0.985 was found among the accessions studied. However, the majority of green plum genotypes derived from an ecologically distinct location within the Mediterranean region were more diverse genetically than those from other locations. In an effort to further characterize this germplasm, the same accessions were analyzed for a number of fruit quality traits. Overall, the results presented here provide useful information about the level of genetic diversity present among the previously uncharacterized plum accessions and identify germplasm that could be potentially superior to the currently cultivated plum genotypes in this plum growing region of Turkey. (C) 2007 Elsevier B.V. All rights reserved.Öğe Dynamical Chiral Metamaterial with Giant Optical Activity and Constant Chirality Over a Certain Frequency Band(Applied Computational Electromagnetics Soc, 2016) Karadag, F.; Comez, I.; Dincer, F.; Bakir, M.; Karaaslan, M.We demonstrate numerically and experimentally a dynamical chiral metamaterial that uniaxially creates giant optical activity and circular dichroism. In addition, the structure gives a high negative refractive index due to the large chirality. The proposed chiral metamaterial includes four L attached cross (FLAC) wire strips and offers a simple geometry, flexibility and more efficient results for chiral metamaterial applications such as polarization rotator, EM filter and so on. The experimental results are in a good agreement with the numerical simulation. It can be seen that FLAC wire strips based chiral metamaterial can also be used to achieve natural-small chirality with a constant value in a wide frequency range between 3.5-4.5 GHz. This is also another crucial feature of the structure. Therefore, the proposed chiral metamaterial with constant chirality value can be used to design novel EM devices such as polarization converter, anti-reflection filters for a certain frequency range.Öğe Molecular characterization of autochthonous Turkish fig accessions(Spanish Natl Inst Agricultural & Food Research & Technolo, 2012) Caliskan, O.; Polat, A. A.; Celikkol, P.; Bakir, M.Turkey is one of the main genetic centers for fig tree, Ficus carica L. The genetic variabilities of 76 fig accessions from Hatay province of Turkey were evaluated by analysis of 10 simple sequence repeats (SSR) loci. The number of alleles revealed by SSR analysis ranged from 3 to 12 alleles per locus with a mean value of 6.8. A total of 68 alleles were detected by SSR and the average heterozygosity was higher than the expected one. In addition, seven random amplified polymorphic DNA (RAPD) primers detected a total of 68 clear and reproducible bands, 55 of which were polymorphic, so it was possible to effectively characterize these fig accessions with either marker techniques. In both marker systems, Mantel's correlation between similarity scores and cophenetic values was moderately high (0.90 for RAPD and 0.87 for SSR), which demonstrated that the clustering patterns fitted the data well. The clusters obtained using these types of markers were independent. This study indicated that there is great genetic variability among local fig accessions, making them a valuable genetic source for incorporation into potential breeding programs especially for table fig selections.Öğe Tunable perfect metamaterial absorber and sensor applications(Springer, 2016) Bakir, M.; Karaaslan, M.; Dincer, F.; Delihacioglu, K.; Sabah, C.Operation frequencies of traditional metamaterial absorbers are fixed meaning that it is not possible to change that frequency after the fabrication. Therefore, more studies are focused on the design of Tunable metamaterial absorber (TMA) since it is important to expand operation frequency. If the impedance of one or more layers of an absorber can be changed according to the applied electrical optical signal, then it would be possible to realize tunable absorbing designs. However, TMA studies reported previously are mainly focused on absorbing mechanism at microwave frequencies. In this study, TMA with varactor diode is designed and analyzed for absorber and sensor configurations. TMA is constructed by using a simple rectangular-shape geometry having two splits and a varactor diode placed at the right split. Numerical and experimental results show that perfect absorption is achieved when 0-10 V reverse bias voltage is applied. Resonance frequency can be easily tuned by changing the reverse bias voltage. Frequency dependent absorption behavior of TMA is presented with respect to different incident angles for TE and TM polarizations. A sensor application, knowing the absorption resonance frequency can provide the ability to determine the temperature of materials. The novelty of the study is to determine the temperature or the other parameters such as humidity or pressure by using TMA. It is also possible to determine the material type or its density if limited resource such as frequency generator is present.
