Search Results - (Author, Cooperation:S. Yilmaz)
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1Latest Papers from Table of Contents or Articles in PressV. E. Clark ; E. Z. Erson-Omay ; A. Serin ; J. Yin ; J. Cotney ; K. Ozduman ; T. Avsar ; J. Li ; P. B. Murray ; O. Henegariu ; S. Yilmaz ; J. M. Gunel ; G. Carrion-Grant ; B. Yilmaz ; C. Grady ; B. Tanrikulu ; M. Bakircioglu ; H. Kaymakcalan ; A. O. Caglayan ; L. Sencar ; E. Ceyhun ; A. F. Atik ; Y. Bayri ; H. Bai ; L. E. Kolb ; R. M. Hebert ; S. B. Omay ; K. Mishra-Gorur ; M. Choi ; J. D. Overton ; E. C. Holland ; S. Mane ; M. W. State ; K. Bilguvar ; J. M. Baehring ; P. H. Gutin ; J. M. Piepmeier ; A. Vortmeyer ; C. W. Brennan ; M. N. Pamir ; T. Kilic ; R. P. Lifton ; J. P. Noonan ; K. Yasuno ; M. Gunel
American Association for the Advancement of Science (AAAS)
Published 2013Staff ViewPublication Date: 2013-01-26Publisher: American Association for the Advancement of Science (AAAS)Print ISSN: 0036-8075Electronic ISSN: 1095-9203Topics: BiologyChemistry and PharmacologyComputer ScienceMedicineNatural Sciences in GeneralPhysicsKeywords: Adult ; Aged ; Aged, 80 and over ; Brain Neoplasms/classification/*genetics/pathology ; Chromosomes, Human, Pair 22/genetics ; DNA Mutational Analysis ; Female ; Genes, Neurofibromatosis 2 ; Genomic Instability ; Genomics ; Humans ; Kruppel-Like Transcription Factors/*genetics ; Male ; Meningeal Neoplasms/classification/*genetics/pathology ; Meningioma/classification/*genetics/pathology ; Middle Aged ; Mutation ; Neoplasm Grading ; Proto-Oncogene Proteins c-akt/*genetics ; Receptors, G-Protein-Coupled/*genetics ; Tumor Necrosis Factor Receptor-Associated Peptides and Proteins/*geneticsPublished by: -
2Latest Papers from Table of Contents or Articles in PressCiftci-Yilmaz, S., Au, W.-C., Mishra, P. K., Eisenstatt, J. R., Chang, J., Dawson, A. R., Zhu, I., Rahman, M., Bilke, S., Costanzo, M., Baryshnikova, A., Myers, C. L., Meltzer, P. S., Landsman, D., Baker, R. E., Boone, C., Basrai, M. A.
Genetics Society of America (GSA)
Published 2018Staff ViewPublication Date: 2018-08-31Publisher: Genetics Society of America (GSA)Print ISSN: 0016-6731Topics: BiologyPublished by: -
3Latest Papers from Table of Contents or Articles in PressStaff View
Publication Date: 2018-09-08Publisher: American Physical Society (APS)Print ISSN: 0556-2813Electronic ISSN: 1089-490XTopics: PhysicsKeywords: Nuclear ReactionsPublished by: -
4Articles: DFG German National LicensesRen, W. ; Bauer, S. ; Yilmaz, S¸. ; Wirges, W. ; Gerhard-Multhaupt, R.
[S.l.] : American Institute of Physics (AIP)
Published 1994Staff ViewISSN: 1089-7550Source: AIP Digital ArchiveTopics: PhysicsNotes: Nonlinear optical polymers contain molecular dipoles with very large hyperpolarizabilities in a glassy polymer matrix. Two typical examples—a guest-host system with dispersed polar dye molecules and a side-chain material with chemically attached molecular dipoles—were investigated by means of poling experiments, dielectric spectroscopy, thermally stimulated depolarization, and electro-optical thermal analysis. The dielectric behavior of both polymers can be described by the phenomenological Havriliak–Negami equation, and the existence of master curves for both materials demonstrates the validity of the time-temperature superposition principle above the respective glass transitions. Temperature-dependent mean relaxation times and relaxation-time distributions calculated from the dielectric data allow for an optimization of poling times. The dielectric relaxation strengths obtained from poling current and field, from dielectric measurements, and from thermally stimulated depolarization are in very good agreement and thus represent a useful measure of the polarization in poled polymers. From the temperature dependence of the polarization, optimal poling temperatures may be derived. Electro-optical thermal analysis yields the same temperature-stability curves as thermally stimulated depolarization and is therefore a valuable tool for investigating the stability of poled polymers, especially since it is not sensitive to charge effects. Optimal poling fields and currents must be selected as a compromise between high dipole mobilities (short relaxation times) and low bulk conductivities.Type of Medium: Electronic ResourceURL: -
5Articles: DFG German National LicensesYilmaz, S. ; Venkatesan, T. ; Gerhard-Multhaupt, R.
Woodbury, NY : American Institute of Physics (AIP)
Published 1991Staff ViewISSN: 1077-3118Source: AIP Digital ArchiveTopics: PhysicsNotes: The preparation of epitaxial potassium-tantalate-niobate (KTa0.7Nb0.3O3, KTN) films on strontium-titanate substrates by means of pulsed excimer laser evaporation in vacuum is reported. In the most successful deposition experiments, a segmented evaporation target consisting of a semicircular KTN single crystal and a semicircular potassium nitrate pellet was utilized−to our knowledge for the first time; it was thus possible to overcome the otherwise observed partial loss of the volatile potassium and to avoid potassium deficiency in the KTN films. Rutherford backscattering spectrometry and x ray diffraction results indicate that the samples have the desired stoichiometric composition as well as the orientation prescribed by the substrate crystal.Type of Medium: Electronic ResourceURL: -
6Articles: DFG German National LicensesCheng, Zhong-Yang ; Yilmaz, S¸ükrü ; Wirges, Werner ; Bauer-Gogonea, Simona
[S.l.] : American Institute of Physics (AIP)
Published 1998Staff ViewISSN: 1089-7550Source: AIP Digital ArchiveTopics: PhysicsNotes: The investigation of dipole relaxation processes in nonlinear optical (NLO) polymers containing chromophore dipoles with large hyperpolarizabilities is important for optimizing the poling process and for predicting the long-term stability of the poling-induced order. The primary or α relaxation is difficult to assess by dielectric spectroscopy in polymers with high glass transition temperature due to thermally induced chromophore degradation. A fast experimental procedure is developed for the investigation of dielectric relaxation processes in NLO polymers, without severely inducing chromophore degradation. The procedure is based on the measurement of the dielectric function cursive-epsilon˜(T)=cursive-epsilon′(T)−icursive-epsilon″(T) at a few frequencies from 30 Hz to 30 kHz, while heating the polymer at a constant rate. The complex plane representation of the temperature-dependent dielectric function is used to determine the distribution of relaxation times, while the temperature-dependent mean relaxation time τα(t) is numerically determined from the dielectric loss cursive-epsilon″(T). With only three decades in frequency, information on five decades in time or 90 K in temperature is gained above the glass transition temperature. The strong α and the weak β relaxation below the glass transition are separately investigated by thermally stimulated depolarization after a suitable two-step poling procedure. The method has been applied to a typical polyimidelike side-chain nonlinear optical polymer with modified Disperse Red 1 chromophores. Even below room temperature, a γ-relaxation process is observed, demonstrating significant mobility of the chromophores much below the glass transition. From the results of thermally stimulated depolarization it is concluded that the initial fast decay of the electro-optical response to a temporally stable value is related to the partial depolarization caused by the β relaxation. © 1998 American Institute of Physics.Type of Medium: Electronic ResourceURL: -
7Articles: DFG German National LicensesBauer, S. ; Ren, W. ; Yilmaz, S¸. ; Wirges, W. ; Molzow, W.-D. ; Gerhard-Multhaupt, R. ; Oertel, U. ; Hänel, B. ; Häussler, L. ; Komber, H. ; Lunkwitz, K.
Woodbury, NY : American Institute of Physics (AIP)
Published 1993Staff ViewISSN: 1077-3118Source: AIP Digital ArchiveTopics: PhysicsNotes: Stable polymers with nonlinear optical side groups were synthesized from maleic anhydride copolymers and the azo dye Disperse Red 1 via esterification. After electrode poling under 135 V/μm at 185 °C, thermal stabilities were measured by pyroelectric and electro-optic thermal analysis and compared to a guest/host polymer of polymethylmethacrylate and the same dye. The pyroelectrically detected dipole orientation and the electro-optic activity of the side-chain polymers decreased only above 150 °C, and electro-optic r33 coefficients of up to 6 pm/V were achieved at 780 nm even without optimizing the dye content.Type of Medium: Electronic ResourceURL: -
8Articles: DFG German National LicensesYilmaz, S¸. ; Bauer, S. ; Wirges, W. ; Gerhard-Multhaupt, R.
Woodbury, NY : American Institute of Physics (AIP)
Published 1993Staff ViewISSN: 1077-3118Source: AIP Digital ArchiveTopics: PhysicsNotes: Compact and simple experimental setups for scanning pyroelectrical and electro-optical microscopy are introduced. Their feasibility is demonstrated with scans of periodically poled layers of a nonlinear optical side-chain polymer. While the scanning pyroelectrical microscope has a less complex design and is easier to use, the scanning electro-optical microscope exhibits better spatial resolution and higher contrast. Both tools will be essential for optimizing the patterned poling of nonlinear optical waveguides, modulators, and sensors.Type of Medium: Electronic ResourceURL: -
9Articles: DFG German National LicensesYilmaz, S¸. ; Bauer, S. ; Gerhard-Multhaupt, R.
Woodbury, NY : American Institute of Physics (AIP)
Published 1994Staff ViewISSN: 1077-3118Source: AIP Digital ArchiveTopics: PhysicsNotes: Photothermal heating of a nonlinear optical polymer film with a focused laser beam leads to local temperatures above the glass transition so that the molecular dipoles orient in the electric field applied to the electrodes. Periodic switching of the field direction during movement of the sample yields gratings with alternating polarity which were studied with scanning electro-optical microscopy. The width and the depth of the poled stripes were probed with electro-optical and pyroelectrical techniques, respectively. Photothermal poling may be combined with other poling techniques in order to produce various dipole-orientation patterns for device applications.Type of Medium: Electronic ResourceURL: -
10Articles: DFG German National LicensesYilmaz, S. ; Wirges, W. ; Bauer-Gogonea, S. ; Bauer, S. ; Gerhard-Multhaupt, R.
Woodbury, NY : American Institute of Physics (AIP)
Published 1997Staff ViewISSN: 1077-3118Source: AIP Digital ArchiveTopics: PhysicsNotes: Crosslinking of polymers with dipoles can be followed by means of dielectric, pyroelectric, and in situ electro-optic measurements. All three techniques provide similar insights as to the cross-linking process. In addition, electro-optic measurements allow for the determination of the resulting optical nonlinearity. After crosslinking is completed the polymer behaves like a side-chain polymer. In addition, photoinduced poling of an already cross-linked dipolar polymer network is demonstrated. © 1997 American Institute of Physics.Type of Medium: Electronic ResourceURL: -
11Articles: DFG German National LicensesJäger, M. ; Stegeman, G. I. ; Brinker, W. ; Yilmaz, S. ; Bauer, S. ; Horsthuis, W. H. G. ; Möhlmann, G. R.
Woodbury, NY : American Institute of Physics (AIP)
Published 1996Staff ViewISSN: 1077-3118Source: AIP Digital ArchiveTopics: PhysicsNotes: We have investigated three different quasi-phase-matching approaches to second-harmonic generation (SHG) in DANS (4-dimethylamino-4′-nitrostilbene) poled polymer channel waveguides at 1.5 μm. Periodic photobleaching and periodically poled electrodes deposited directly on the film produced unacceptably high propagation losses. However, periodic electrodes on the substrate gave low losses and useful SHG. © 1996 American Institute of Physics.Type of Medium: Electronic ResourceURL: -
12Articles: DFG German National LicensesWirges, W. ; Yilmaz, S. ; Brinker, W. ; Bauer-Gogonea, S. ; Bauer, S.
Woodbury, NY : American Institute of Physics (AIP)
Published 1997Staff ViewISSN: 1077-3118Source: AIP Digital ArchiveTopics: PhysicsNotes: Modal dispersion phase-matched second harmonic generation is demonstrated in new poled polymer waveguide geometries with a nonlinear optical core consisting of two side-chain polymers with different glass transition temperatures. After poling above and between the respective glass transitions, the sign of the nonlinear optical coefficient is reversed in the two polymers, thereby improving the overlap integral. Conversion efficiencies up to 7%/W cm2 were achieved in the first experiments. © 1997 American Institute of Physics.Type of Medium: Electronic ResourceURL: -
13Articles: DFG German National LicensesKUUSANMÄKI, P. ; LAURONEN, J. ; PAAVONEN, T. ; PAKARINEN, M. ; YILMAZ, S. ; HÄYRY, P. ; HALTTUNEN, J.
Oxford, UK : Blackwell Science Ltd
Published 1997Staff ViewISSN: 1365-3083Source: Blackwell Publishing Journal Backfiles 1879-2005Topics: MedicineNotes: Porcine small bowel allografts were followed for 18 weeks during immunosuppression with cyclosporine-A (CyA), azatioprine and prednisone. The mucosal alterations noted at the 12th week were epithelial vacuolation and loss of Goblet cells. Moderate infiltration of inflammatory cells, mainly lymphocytes, was found in the lamina propria. In addition, a few grafts exhibited oedema and fibrosis. Vessels already showed endothelial swelling and intimal proliferation at the 12th week. In the submucosa, the infiltration of inflammatory cells was not present till the 18th week. Further changes in the mucosa at the 18th week were the blunting of villi, cuboidal epithelium, crypt abscesses and epithelial atrophy. The histological alterations of mucosa and lamina propria existing in the full thickness biopsies were mostly also detectable in mucosal biopsies, provided that multiple biopsies were taken. Thus these parameters analyzed from mucosal biopsy material are suitable for the diagnosis and monitoring of chronic small bowel rejection. In autopsy, the most prominent features were in the mesenterial arteries: intimal proliferation, vasculitis, proliferation of media and endothelial alterations. The activity of the mucosal disaccharidases maltase and sucrase remained near the initial level till the 12th week and had decreased markedly by the 18th week.Type of Medium: Electronic ResourceURL: -
14Articles: DFG German National LicensesAtalar, Ö. ; Yilmaz, S. ; Di̇nç, G. ; Özdemi̇r, D.
Berlin, Germany : Blackwell Verlag GmbH
Published 2004Staff ViewISSN: 1439-0264Source: Blackwell Publishing Journal Backfiles 1879-2005Topics: MedicineNotes: The venous drainage of the heart in porcupines (Hystrix cristata) was investigated. Each of the five adult porcupines (three males, two females) was injected with a coloured latex mixture via the V. cava caudalis for the demonstration of the cardiac veins. The dissection of the specimens revealed that the venous drainage of the heart in porcupines was made by the V. cordis magna, V. distalis ventriculi sinistri, V. proximalis ventriculi sinistri, V. cordis caudalis (the left marginal vein), V. cordis media and Vv. cordis dextrae. The cardiac veins were observed in a subepicardial course on the heart except for the R. interventricularis paraconalis. The R. interventricularis paraconalis showed an intramyocardial course until the middle of the sulcus interventricularis paraconalis, and a subepicardial course after this point. The V. cordis magna and V. distalis ventriculi sinistri opened to the sinus coronarius. The V. cordis caudalis and the V. cordis media drained into the V. cava caudalis. The venous drainage of the conus arteriosus was made by the left V. coni arteriosi opening to the R. interventricularis paraconalis, and by the right V. coni arteriosi which continued to the Vv. cordis dextrae.Type of Medium: Electronic ResourceURL: -
15Articles: DFG German National LicensesAtalar, Ö. ; Yilmaz, S. ; Burma, O. ; İlkay, E.
Berlin, Germany : Blackwell Verlag GmbH
Published 2003Staff ViewISSN: 1439-0264Source: Blackwell Publishing Journal Backfiles 1879-2005Topics: MedicineNotes: The anatomy of aortic arch in porcupine was studied. Angiography was applied to each of the three adult porcupines (two males, one female) following the injection of latex from the abdominal aorta for the examination of aortic arch. The results indicated that three arteries arose from aortic arch in porcupine. These were truncus brachiocephalicus, arteria carotis communis sinistra and arteria subclavia sinistra. The truncus brachiocephalicus in porcupine yielded arteria subclavia dextra and arteria carotis communis dextra. Truncus bicaroticus was absent. The origin of truncus costocervicalis (right) and arteria vertebralis (right) arose from a common root. Left or right axillary arteries seemed to be a continuation of subclavian arteries. The results of this study may contribute to the data in this area of science.Type of Medium: Electronic ResourceURL: -
16Articles: DFG German National LicensesStaff View
ISSN: 1439-0264Source: Blackwell Publishing Journal Backfiles 1879-2005Topics: MedicineNotes: The aim of this study was to investigate the axial skeleton of two porcupines (Hystrix cristata).The important features of the skull, observed in this study are as follows: The zygomatic process of frontal bone (os fron-tale) was found to be rudimentary, and the infraorbital foramen (for. infraorbitale) was very large. The zygomatic bone (os zygomaticum) has two processes (frontal and temporal) and the zygomatic arch (arcus zygomaticum) was composed of three bones.The dental formulae were 2 (I 1/1, C 0/0, P 1/1, M 3/3) = 20. The angular process (Proc. angularis) of mandible is well developed.The vertebral formula was found as C7, T15, L4, S4, Ca12. All of cervical vertebrae had the transverse foramen (for. transversarium).The first eleven spinous processes (proc. spinosus) of thoracic vertebrae were caudally-sloped, the twelfth as the anticlin vertebrae and the last three were directed cranially.Hemal arches (or ossa arcus hemalis) were presented as separate bones which articulate with the ventral surfaces of the caudal ends of the bodies of the second, third and fourth caudal vertebrae.Type of Medium: Electronic ResourceURL: -
17Articles: DFG German National LicensesÖztan, M. Dartar ; Yilmaz, Ş. ; Kalayci, A. ; Zai̇moğlu, L.
Oxford, UK : Blackwell Science Ltd
Published 2003Staff ViewISSN: 1365-2842Source: Blackwell Publishing Journal Backfiles 1879-2005Topics: MedicineNotes: summary The purpose of this study was to compare the cytotoxicity of an epoxy resin-based sealer (AH Plus) and a silicone-based sealer (Roeko Seal Automix, RSA). Cytotoxicity was assessed using the MTT assay for mitochondrial enzyme activity and haemocytometer viable cell counting after 24, 48 and 72-h exposure to L929 cells. AH Plus and RSA showed no statistically significant difference in the degree of toxicity. Both sealers had a low toxic influence on the cells during the experimental period. This study indicates that epoxy resin-based sealer AH Plus and the silicone-based sealer RSA have similar levels of cytotoxicity to mouse fibroblasts.Type of Medium: Electronic ResourceURL: -
18Articles: DFG German National LicensesStaff View
ISSN: 1365-2842Source: Blackwell Publishing Journal Backfiles 1879-2005Topics: MedicineNotes: summary The purpose of this study was to determine diffusion of hydroxyl ions through dentine from different calcium hydroxide [Ca(OH)2] medicaments. Forty-five single-rooted teeth were instrumented and cavities (3 mm in diameter and 1 mm in depth) were prepared on the facial surface of each root. After smear layer was removed with 17% EDTA all surfaces of roots, except cavities, were coated with nail polish. Teeth were randomly divided into four experimental groups (each 10 samples) and a control group (five samples). They were filled with: group 1, Ca(OH)2 and distilled water mixture; group 2, TempCanal; group 3, Calasept; and group 4, Ca(OH)2 plus point. Control group, in which nothing was applied to the canals. All samples were immersed in distilled water maintained at 37 °C. pH values were measured at 1 h, 2 h, 3 h, 24 h, 48 h, 72 h, 4 days, 5 days, 6 days, 7 days and 14 days. Ca(OH)2-distilled water mixture and TempCanal showed highest pH values at 24 h. Calasept, Ca(OH)2 plus point and control showed highest pH values at 3 h. Time intervals after 24 h, Ca(OH)2-distilled water mixture, TempCanal and Calasept showed higher pH values than Ca(OH)2 plus point, with a statistically significant difference (P 〈 0·05). The pH value of Ca(OH)2 plus point was lower than the values of other materials after 3 h. This study indicates that non-setting Ca(OH)2 based materials have an effective release of hydroxyl ions compared with Ca(OH)2 plus point.Type of Medium: Electronic ResourceURL: -
19Articles: DFG German National LicensesStaff View
ISSN: 1365-3059Source: Blackwell Publishing Journal Backfiles 1879-2005Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, NutritionType of Medium: Electronic ResourceURL: -
20Articles: DFG German National LicensesStaff View
ISSN: 0003-9861Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002Topics: BiologyChemistry and PharmacologyPhysicsType of Medium: Electronic ResourceURL: