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2. Transient Tachypnea of the Newborn (TTN): A Role for Polymorphisms of Surfactant Protein B (SP-B) Encoding Gene? [Transiente Tachypnoe des Neugeborenen (TTN): Spielen Polymorphismen im Surfactant-Protein-B-Gen (SP-B) eine Rolle?]

Author

Tutdibi, E. Hospes, B. Landmann, E. Gortner, L. Satar, M. Yurdakök, M. Dellagrammaticas, H. Örs, R. Ilikkan, B. Ovali, F. Sarman, G. Kumral, A. Arslanoglu, S. Koc, H. Yildiran, A.

Abstract

Background: Transient tachypnea of the newborn (TTN) is usually a benign self-limiting respiratory disorder in the immediate neonatal period. The lipophilic surfactant-associated protein B (SP-B) was demonstrated to be the most relevant structural component of the surfactant system for immediate postnatal pulmonary adaptation. We hypothesized genetic variations of surfactant protein B (heterozygous 121 ins 2 mutation er intron 4 polymorphisms) to be related to TTN. Patients and Method: We screened genomic DNA of 83 healthy term neonates (gestational age: 39 (37-41) completed weeks [median and range]; birth weight: 3325 ± 541 grams [mean ± SD]) and 75 infants presenting with TTN (gestational age: 38 (37-41) completed wecks [median and range]; birth weight: 3091 ± 435 grams [mean ± SD]) by means of PCR-amplification, fragment length and sequence analysis. TTN was diagnosed an the basis of the clinical signs with respiratory rate > 60 breaths/minute, fraction of inspired oxygen > 0.21, and characteristic radiographic findings within less than 24 hours after birth. Newborns with any infection, pulmonary or cardiac congenital malformations, postnatal asphyxia and infants born to diabetic mothers were excluded. Results: In TTN-group the frequency of male infants (68.4% versus 44.6%, p < 0.05) and caeserian section were significantly higher (68.4% versus 30.1%, p < 0.05). We did not find any statistical difference in frequency of intron 4 variations between controls and TTN-group (8.4% versus 10.7%). None of the infants were heterozygous for the 121ins2 SP-B mutation. Conclusions: WC conclude polymorphisms of intron 4 and heterozygous 121 ins 2 mutation not to associated with TTN.

Published
2003

27. Hepatitis A and hepatitis E prevalence in children in Konya, Turkey

Author

Emel Türk Aribas, Altinidis, M., Ceri, A., and Koc, H.

Subjects
viruses, Hepatitis E virus, Prevalence, virus diseases, Herpatitis A virus, Children, digestive system diseases
Abstract

We are reporting the prevalence of Hepatitis A and E virus infections among children in Konya, Turkey. Serum samples were taken from 162 children, which were admitted to hospital for complaints other than jaundice. HAV - antibodies and HEV- antibodies were determined by EIA. The sero-prevalence of HAV and HEV was 95% and 12.3% respectively. We conclude that beside high rate of HAV infection among children, HEV infection is the second most important liver viral infection in children in Konya region.

49. A REVIEW OF MECHANICAL AND THERMAL PROPERTIES OF PRODUCTS PRINTED WITH RECYCLED FILAMENTS FOR USE IN 3D PRINTERS

Author

Menderes Kam, Hanife Bukre Koc, Gurcan Atakok, and ATAKÖK G., KAM M., Koc H. B.

Subjects
CHEMISTRY, PHYSICAL, FDM, Materials science, Additive manufacturing, Temel Bilimler (SCI), FABRICATION, Environmental pollution, Fizik, Physical Chemistry, Kimya, 3d printer, PHYSICS, DESIGN, CHEMISTRY, VIRGIN, Thermal, COMPOSITES, Materials Chemistry, 3D printer, PHYSICS, CONDENSED MATTER, Physical and Theoretical Chemistry, OPTIMIZATION, Process engineering, business.industry, Temel Bilimler, KİMYA, FİZİKSEL, Fizikokimya, MATERIAL-EXTRUSION, POLYMER, General Chemistry, Surfaces and Interfaces, Condensed Matter 1: Structural, Mechanical and Thermal Properties, Condensed Matter Physics, Yoğun Madde 1:Yapısal, Mekanik ve Termal Özellikler, Electronic, Optical and Magnetic Materials, Surfaces, Coatings and Films, filament, Chemistry (miscellaneous), Natural Sciences (SCI), Physical Sciences, recycle, environmental pollution, Natural Sciences, business, FİZİK, YOĞUN MADDE, SYSTEM
Abstract

Three-dimensional printers (3DP), which are often heard with additive manufacturing, are widely used in part production. Sensitive and custom-made products in different designs can be produced more easily and quickly, but waste specimen formed after the failed three-dimensional (3D) prints cause waste and environmental pollution from the expensive filament material. It is thought that such problems can be prevented by minimizing the waste when the scrap materials generated as a result of each production are recovered. This study investigated the benefits of recycling all possible waste filament specimens, including the supports removed from the part after the defective products or supported production, by granulating and reusing in the production of new parts in the next 3D production process. Mechanical differences between the 3D specimens produced with virgin filaments to be printed with recycled filaments are investigated and it has been determined that most of the countries cause environmental pollution due to the waste of materials including additive manufacturing and 3DP processes. The use of the filament material, which takes a long time to procure from abroad and is mainly procured externally, will be increased from one time to twice or thrice, thus facilitating the availability and preventing environmental pollution.

Published
2021
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50. First principles prediction of the elastic, electronic, and optical properties of Sb2S3 and Sb2Se3 compounds

Author

Engin Deligoz, Amirullah M. Mamedov, Haci Ozisik, Husnu Koc, Sabire Yazıcı Fen Edebiyat Fakültesi, [Koc, H.] Siirt Univ, Dept Phys, TR-56100 Siirt, Turkey -- [Mamedov, Amirullah M.] Bilkent Univ, Nanotechnol Res Ctr NANOTAM, TR-06800 Ankara, Turkey -- [Deligoz, E.] Aksaray Univ, Dept Phys, TR-68100 Aksaray, Turkey -- [Ozisik, H.] Aksaray Univ, Dept Comp & Instruct Technol Teaching, TR-68100 Aksaray, Turkey, and OZISIK, HACI -- 0000-0002-4011-1720

Subjects
Electronic structure, Materials science, Mechanical Propertiesoptical, Properties, Antimony compounds, FOS: Physical sciences, Young's modulus, Mechanical properties, Dielectric functions, Semiconducting selenium compounds, Shear modulus, symbols.namesake, Second orders, Debye temperature, General Materials Science, Pressure derivatives, Elastic modulus, Debye model, Ab initio calculation, Young's Modulus, Bulk modulus, Condensed Matter - Materials Science, Condensed matter physics, Optical properties, Elastic moduli, Materials Science (cond-mat.mtrl-sci), General Chemistry, Poisson's ratio, Condensed Matter Physics, First-principles study, Anisotropy factor, Electronic Structure, Local density approximation, Ab Initio Calculation, symbols, Density functional theory, Optical dielectric constant, Structural estimation, Ab initio calculations, Local-density approximation, Valence electron
Abstract

WOS: 000308769000034, We have performed a first principles study of structural, mechanical, electronic, and optical properties of orthorhombic Sb2S3 and Sb2Se3 compounds using the density functional theory within the local density approximation. The lattice parameters, bulk modulus, and its pressure derivatives of these compounds have been obtained. The second-order elastic constants have been calculated, and the other related quantities such as the Young's modulus, shear modulus, Poisson's ratio, anisotropy factor, sound velocities, Debye temperature, and hardness have also been estimated in the present work. The linear photon-energy dependent dielectric functions and some optical properties such as the energy-loss function, the effective number of valence electrons and the effective optical dielectric constant are calculated. Our structural estimation and some other results are in agreement with the available experimental and theoretical data. (C) 2012 Elsevier Masson SAS. All rights reserved.

Published
2012
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