Scopus İndeksli Yayınlar Koleksiyonu / Scopus Indexed Publications Collection

Permanent URI for this collectionhttps://hdl.handle.net/11147/7148

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  • Article
    From Work to Leisure: ”Transforming Kitchen Spaces, Technologies, and Practices in Türkiye, 1930s-2020s.”
    (Taylor and Francis Ltd., 2025) Emgin, B.; Bektaş Ata, L.; Karaosmanoğlu, D.
    Kitchens are more than functional spaces; they reflect and shape cultural values, technologies, and ideals of modern life. Framing the kitchen as an orchestrating concept that brings together images, materials, and competencies, this article examines how idealized settings and tools have produced shifting narratives of modernity and redefined meanings, functions, and everyday practices in Türkiye from the 1930s to the present. It highlights the transformation of the kitchen from a moralizing space to one of entertainment and creativity across three eras: the ordered workshop of the 1930s, the cozy living room of the 1970s, and the technological hub of the 2000s. Drawing on archival research from a larger project on the social history of domestic technologies in Türkiye, the article analyzes newspapers, magazines, TV commercials, social media, and films to reveal how domestic ideals have been negotiated through kitchen spaces. © 2025 Informa UK Limited, trading as Taylor & Francis Group.
  • Article
    Citation - Scopus: 21
    Determination of Superoxide Dismutase Activities in Different Cyanobacteria for Scavenging of Reactive Oxygen Species
    (Taylor and Francis Ltd., 2015) Güneş, Seda; Tamburacı, Sedef; İmamoğlu, Esra; Dalay, Meltem Conk
    There is considerable interest in cyanobacteria as sources of antioxidant pigments, antiinflammatory substances, enzymes such as superoxide dismutase (SOD) and vitamins. Antioxidant enzymes have significant role in the removal of reactive oxygen species produced during visible and ultraviolet irradiance stress in cyanobacteria. One of the most ubiquitous protective enzyme is superoxide dismutase (SOD). Most of cyanobacteria are known to have both FeSOD and MnSOD which are associated with photosystem I and II. These enzymes are responsible for scavenging superoxide radicals.Spirulina platensis and Synechococcus nidulans are widely used cyanobacteria as food supplement and cosmetic due to their bioactive compounds. Although the chemical composition of S.platensis has been investigated by many researchers, research on the relationship between protein content and comparison of SOD activity with other cyanobacteria is limited.Among several SOD producing cyanobacteria, the most promising organisms were investigate in terms of SOD activities in this study. The aim of the present work was to investigate and compare the SOD activities of different cyanobacteria including S. platensis, Pseudanabeana sp., S. nidulans and associate with protein contents. SOD activities of these cyanobacteria were determined by xanthine/xanthineoxidase method.Modified Lowry method was used for protein determination. The analysis results showed that the maximum specific SOD activity obtained was 50.4 U/mg from S.nidulans and the minimum specific SOD activity was 18.4 U/mg from Pseudanabeana sp. Total protein amount of S. nidulans, S. platensis, Pseudanabeana sp. was determined as 0.25 mg/ml, 0.27 mg/ml and 0.43 mg/ml respectively. As a result, Synechococcus nidulans was more efficient at scavenging peroxide radicals than Pseudanabeana sp. © 2015, © 2015 Har Krishan Bhalla & Sons.
  • Article
    Citation - Scopus: 8
    Symbolic Creativity in Play Activity: a Critique on Playthings From Daily Life Objects To Toys
    (Taylor and Francis Ltd., 2018) Talu, Nilüfer
    Play is an essential activity for children’s development. Children play with daily life objects as well as toys. Daily life with its various objects and practices provides a real freedom for discovery and self-realization. Children celebrate this value through symbolic creativity that flourishes in various play practices, such as symbolic object use, storytelling, animation in special modes of virtualization and actualization, construction with everyday mathematics and puzzling for order in chaos. The study examines a girl’s play activities with daily life things and waste materials between 6 and 8 years of ages. Finally, the study emphasizes that: (1) symbolic creativity is necessary for children’s self-realization and accordingly for their well-being and (2) toys must be selected carefully to stimulate children’s ability to imagine, create and produce.
  • Article
    Citation - WoS: 10
    Citation - Scopus: 10
    On the Helmholtz Theorem and Its Generalization for Multi-Layers
    (Taylor and Francis Ltd., 2016) Kuştepeli, Alp
    The decomposition of a vector field to its curl-free and divergence-free components in terms of a scalar and a vector potential function, which is also considered as the fundamental theorem of vector analysis, is known as the Helmholtz theorem or decomposition. In the literature, it is mentioned that the theorem was previously presented by Stokes, but it is also mentioned that Stokes did not introduce any scalar and vector potentials in his expressions, which causes a contradiction. Therefore, in this article, Stokess and Helmholtzs representations are examined in detail to reveal and emphasize their differences, similarities and important points. The Helmholtz theorem is obtained for all kinds of spaces by using the theory of distributions in a comprehensive and rigorous manner with detailed explanations, which also leads to a new surface version of the Helmholtz theorem or a new surface decomposition, resulting in the canonical form; hence, it is different than the one suggested previously in terms of two scalar functions. The generalized form of the Helmholtz theorem is also presented by employing the same approach when there is a multi-layer on the surface of discontinuity, which also corresponds to the extension of the theorem to fields with singularities of higher order.
  • Article
    Citation - WoS: 1
    Citation - Scopus: 1
    Revised Distributional Forms of the Laplacian and Poisson's Equation, Their Implications, and All Related Generalizations
    (Taylor and Francis Ltd., 2015) Kuştepeli, Alp
    The theory of distributions of L. Schwartz is a very useful and convenient way for the analysis of physical problems since physical distributions, especially charge distributions yielding the discontinuity of the potential and boundary conditions, can be correctly described in terms of mathematical distributions. To obtain the charge distributions, the distributional form of the Laplacian is applied to the Poisson's equation; therefore, for the correct representations and interpretations, the distributional forms and their proper applications are very important. In this article, it is shown that the distributional form of the Laplacian has been presented by Schwartz and also others with a missing term, leading to confusing and wrong results mathematically, and as a result electromagnetically; and the revised, correct, and complete distributional representations of the Laplace operator, the Poisson equation, and double layers, defined as the dipole layer and equidensity layer, are obtained and presented with detailed discussions and explanations including boundary conditions. By using the revised form of the Laplacian, Green's theorem is obtained explicitly with special emphases about important points and differences with previous works. The generalized forms of the Laplacian, Poisson's equation, charge densities, boundary conditions, and Greens theorem are also presented when there is a multi-layer on the surface of discontinuity.
  • Article
    Citation - WoS: 23
    Citation - Scopus: 26
    Development of Practical Hplc Methods for the Separation and Determination of Eggplant Steroidal Glycoalkaloids and Their Aglycones
    (Taylor and Francis Ltd., 2008) Eanes, Ritchie C.; Tek, Neslihan; Kırsoy, Öyküm; Frary, Anne; Doğanlar, Sami; Almeida, Adelia E.
    A practical set of HPLC methods was developed for the separation and determination of the eggplant steroidal glycoalkaloids, solanine, chaconine, solasonine, solamargine, and their aglycones, solasodine and solanidine. A gradient method was initially developed, but proved to be neither robust nor practical. Three separate isocratic methods using acetonitrile and ammonium dihydrogen phosphate were developed and shown to be more repeatable, less subject to fluctuations in mobile phase composition, and less time consuming. The effect of adjusting buffer pH, column temperature, and buffer type (triethylammonium phosphate vs. ammonium dihydrogen phosphate) were evaluated. It was also discovered that, by addition of 10% methanol to the acetonitrile portion of the mobile phase, more control over the separations was possible. The use of methanol as a mobile phase entrainer greatly improved separations in some cases and its effectiveness was also dependent upon column temperature. Assessments of the method recovery, limit of detection, and limit of quantitation were made using extracts from S. melongena and S. linnaeanum.
  • Article
    Citation - WoS: 2
    Citation - Scopus: 2
    Solid-Phase Microextraction (spme) Followed by On-Fiber Derivatization of Solasodine and Solanidine Aglycones of Steroidal Glycoalkaloids
    (Taylor and Francis Ltd., 2008) Eanes, Ritchie C.; Tek, Neslihan
    Solid-phase microextraction (SPME), followed by on-fiber derivatization was investigated for the analysis of the steroidal glycoalkaloid aglycones, solasodine and solanidine. The aglycones were first extracted by direct immersion of the SPME fiber in the sample medium and then derivatized on the fiber in a separate step using 1-(trimethylsilyl)imidazole (TMSI). The derivatized compounds were then desorbed from the SPME fiber and detected by GC-MS. Polydimethylsiloxane/Divinylbenzene (PDMS-DVB), Carboxen/ Polydimethylsiloxane (CAR-PDMS), and Carbowax/Divinylbenzene (CW-DVB) fibers were employed with the CW-DVB fibers being the most successful, as expected. Closed-end capillary tubes were used to hold the extraction media. Both aglycones were successfully extracted, derivatized, and detected by GC-MS. Solasodine always required derivatization, but solanidine did not. The same method was successfully applied to cholesterol so that it could be used as an internal standard. Also, using the closed-end capillary tubes, a two-phase extraction system was also investigated, whereby the fiber was only exposed to the phase in which it was presumed to be less damaged. However, in all cases, fiber degradation was significant, preventing the use of extended extraction times and limiting reuse of the fibers. However, the results represent a first look into the feasibility of the method. With the development of more suitable SPME phases, this method could potentially provide a complementary route for routine determinations of glycoalkaloids for both research and food quality control.