22 research outputs found
Novel Hybrid Scaffolds for the Cultivation of Osteoblast Cells
No full textTurkoglu Sasmazel, Hilal/0000-0002-0254-4541In this study, natural biodegradable polysaccharide, chitosan, and synthetic biodegradable polymer, poly(epsilon-caprolactone) (PCL) were used to prepare 3D, hybrid polymeric tissue scaffolds (PCL/chitosan blend and PCL/chitosan/PCL layer by layer scaffolds) by using the electrospinning technique. The hybrid scaffolds were developed through HA addition to accelerate osteoblast cell growth. Characteristic examinations of the scaffolds were performed by micrometer, SEM, contact angle measurement system, ATR-FTIR, tensile machine and swelling experiments. The thickness of all electrospun scaffolds was determined in the range of 0.010 +/- 0.001-0.012 +/- 0.002 mm. In order to optimize electrospinning processes, suitable bead-free and uniform scaffolds were selected by using SEM images. Blending of PCL with chitosan resulted in better hydrophilicity for the PCL/chitosan scaffolds. The characteristic peaks of PCL and chitosan in the blend and layer by layer nanofibers were observed. The PCL/chitosan/PCL layer by layer structure had higher elastic modulus and tensile strength values than both individual PCL and chitosan structures. The layer by layer scaffolds exhibited the PBS absorption values of 184.2; 197.2% which were higher than those of PCL scaffolds but lower than those of PCL/chitosan blend scaffolds. SaOs-2 osteosarcoma cell culture studies showed that the highest ALP activities belonged to novel PCL/chitosan/PCL layer by layer scaffolds meaning better cell differentiation on the surfaces. (C) 2011 Elsevier B.V. All rights reserved.Turkish Academy of Science (TUBA) L'Oreal; L'OrealThe author is greatly thankful to Turkish Academy of Science (TUBA) & L'Oreal for honoring this study with the award "Young Women in Science" in Materials Science in 2009. Her special thanks also go to L'Oreal for the precious financial support. The author also appreciates the invaluable contribution of AWAC (Academic Writing Advisory Center) to this study in linguistic terms
Turkish truffles I: 18 new records for Turkey
No full textWOS: 000352486200014We report the first records of 18 truffle species in Turkey. Three belong to the Ascomycota: Elaphomyces leucocarpus, E. muricatus, and Genea sphaerica; and 15 to the Basidiomycota: Alpova corsicus, Gautieria otthii, G. retirugosa, G. trabutii, Hymenogaster citrinus, H. hessei, H. luteus, H. lycoperdineus, Hysterangium clathroides, H. epiroticum, H. fragile, H. nephriticum, Leucogaster tozzianus, Octaviania asterosperma, and Protoglossum aromaticum. We also report new localities within Turkey for Picoa juniperi, P. lefebvrei, Geopora cooperi, Terfezia arenaria, T. claveryi, Tuber aestivum, and T. nitidum in the Ascomycota; and Leucogaster nudus, Hymenogaster thwaitesii, H. vulgaris, and Melanogaster broomeanus in the Basidiomycota.Scientific and Technological Research Council of Turkey projectTurkiye Bilimsel ve Teknolojik Arastirma Kurumu (TUBITAK) [T-BAG-111T530, BIDEB-2221]The first author received funding from the Scientific and Technological Research Council of Turkey project number T-BAG-111T530 and BIDEB-2221. We appreciate the help from Abdulkadir Simsek, Ahmet Oksuzoglu, Cemhan Bucak, Coskun Bilgi, Duran Celik, Ekrem Toprak, Esra Er, Fatih Kaya, Gulsum Turkoglu, Idris Sener, Kadir Bazlica, Kadir Ceryan, Mehmet Halil Solak, Mehmet Metin, Mehmet Yucel, Murat Kilic, Mustafa Demir, Mustafa Turuncoglu, Niyazi Ulucoban, Okan Kursun, Osman Coban, Serkan Sevinc, Seyit Ahmet Akay, Tolga Keser, Ugur Demirbilek, Veysel Kodalak, and Yavuzalp Turkoglu in the collection of some of the specimens
A rational approximate solution for generalized pantograph‐delay differential equations
No full textIsik, Osman Rasit/0000-0003-1401-4553WOS: 000377112400007In this paper, a new rational approximation based on a rational interpolation and collocation method is proposed for the solutions of generalized pantograph equations. A comprehensive error analysis is provided. The first part of the error analysis gives an upper bound for the absolute error. The second part is based on residual error procedure that estimates the absolute error. Some numerical examples are given to illustrate the method. The theoretical results support the numerical results. Copyright (c) 2015 John Wiley & Sons, Ltd
Daily changes in winter phytoplankton density of Southern Black Sea (Sinop Bay)
No full textIn this study, short time series (daily) distribution of phytoplankton density was carried out at only one station of the Sinop Bay (South of Black Sea) between 21 January and 04 February 2005. Temperature and salinity were also measured in this study. During the research period, temperature and salinity in the Sinop Bay varied between 8.9-9.4 degrees C and 17.50-17.53 ppt, respectively. The cell densities of Dinophyceae and Bacillariphyceae varied between 00E+00-8.80E+04 cell L-1 and 8.80E+04-1.41E+05 cell L-1, respectively. The cell densities of other taxonomic groups (Cyanophyceae, Prymnesiophyceae, Dictyochophyceae ve Euglenophyceae) varied between 00E+00 and 3.30E+04 cell L-1. Contribution levels of Dinophyceae (% 9.13) and Bacillariphyceae (% 89.16) to total phytoplankton cell density were higher than those of the other taxonomic groups (% 1.71)
CHANGES IN VISION RELATED QUALITY OF LIFE IN PATIENTS WITH DIABETIC MACULAR EDEMA: RANIBIZUMAB OR LASER TREATMENT?
No full textConclusion: Our study revealed that IVR improved not only visual acuity or CRT, but also vision related quality of life more than laser treatment in DME. And these patient-reported outcomes may play an important role in the treatment choice in DME for clinicians. (C) 2015 Elsevier Inc. All rights reserved
New records of some Ascomycete truffle fungi from Turkey
No full textWOS: 000329918200020We report the first records of 6 Ascomycete truffle taxa in Turkey: Genea verrucosa Vittad., Genea klotzschii Berk. & Broome, Stephensia bombycina (Vittad.) Tul. & C. Tul., Terfezia olbiensis Tul. & C. Tul., Tuber excavatum Vittad., and Tuber rufum Pico. We also report new localities within Turkey for Picoa juniperi Vittad., Terfezia leptoderma Tul. & C. Tul., Choiromyces meandriformis Vittad., Tuber brumale Vittad., Tuber nitidum Vittad., and Tuber mesentericum Vittad.Scientific and Technological Research Council of TurkeyTurkiye Bilimsel ve Teknolojik Arastirma Kurumu (TUBITAK) [T-BAG-111T530]The first author received funding from the Scientific and Technological Research Council of Turkey (project number T-BAG-111T530). We appreciate the help of Niyazi Ulucoban, Serkan Sevinc, Mustafa Turuncoglu, Nihat Guldas, Fatih Kaya, Osman Coban, and Mehmet Cirit in the collection of some of the specimens. We also appreciate the helpful commentary of Dr James M Trappe
Assessing Rock Mass Permeability Using Discontinuity Properties
No full textISRM European Rock Mechanics Symposium (EUROCK) - JUN 20-22, 2017 - Ostrava, CZECH REPUBLICWOS: 000416996000082Field measurement of rock mass permeability is essential that numerous factors influence its directional magnitude. Lugeon test is a popularly conducted field instrument in order to measure hydraulic conductivity of a rock mass. Discontinuity orientation, spacing and discontinuity surface quality, infill presence and type play essential role in permeability of the rock mass in addition to rock material itself. Geological Strength Index (GSI) is a parameter used in Gen. Hoek-Brown failure criterion and supporting empirical equations in order to estimate rock mass strength and deformability parameters. Frequently used Rock Quality Designation (RQD) and GSI and Lugeon values were combined in order to generate a relation among them. The proposed relationships are produced by interpretation of geotechnical core logging and Lugeon test results. (C) 2017 The Authors. Published by Elsevier Ltd.Int Soc Rock Mech, ASCR, Inst GeonPolyak Eynez Energy Mining A.S. and Fina EnergyThe author thanks to Polyak Eynez Energy Mining A.S. and Fina Energy and its personnel for supporting scientific research and providing necessary data for the study. The author presents his gratitudes to Geological Engineers of Polyak Eynez, Feridun Emre Yagimli, Turkoglu, Mehmet Kilic for providing extensive data on the geology of the area, preparation of geotechnical borehole logs and their additional care during hydraulic testing. Special thanks also go to the reviewers
Some fixed point results in complete generalized metric spaces
No full textThe Banach contraction principle is the most important result. This principle has many applications and some authors was interested in this principle in various metric spaces as Brianciari.
The author initiated the notion of the generalized metric space as a generalization of a metric space by replacing the triangle inequality by a more general inequality, for all pairwise distinct points of . As such, any metric space is a generalized metric space but the converse is not true. He proved the Banach fixed point theorem in such a space. Some authors proved different types of fixed point theorems by extending the Banach's result. Wardowski introduced a new contraction, which generalizes the Banach contraction. He using a mapping introduced a new type of contraction called -contraction and proved a new fixed point theorem concerning -contraction. In this paper, we have dealt with -contraction and -weak contraction in complete generalized metric spaces. We prove some results for -contraction and -weak contraction and we show that the existence and uniqueness of fixed point for satisfying -contraction and -weak contraction in complete generalized metric spaces. Some examples are supplied in order to support the useability of our results. The obtained result is an extension and a generalization of many existing results in the literature
Formwork Systems Selection Criteria for Building Construction Projects: A Critical Review of the Literature
No full textFormwork system (FWS) is one of the key components in reinforced concrete (RC) construction. Therefore, selection of the most appropriate FWS plays a critical role in the project success. Since the FWS selection is affected by several compromising and conflicting criteria, numerous studies have been carried out to identify the FWS selection criteria and/or have employed various multi-criteria decision-making (MCDM) methods since the early 1990s. However, there is no research that conducts a critical review of the previous studies addressing the FWS selection criteria in building construction projects. This study aims to fill this knowledge gap. For this purpose, a critical review of the relevant literature was carried out using an integrative approach and the findings were validated through face-to-face interviews with professionals specialized in formwork engineering. The findings of this study may provide practitioners with a useful guide that can assist them in selecting the most appropriate FWS.The presentation of the authors' names and (or) special characters in the title of the pdf file of the accepted manuscript may differ slightly from what is displayed on the item page. The information in the pdf file of the accepted manuscript reflects the original submission by the author
Author response: The relationship between mean platelet volume and inflammation in varicocele pathophysiology
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