Aksaray Üniversitesi Kurumsal Akademik Arşivi
DSpace@Aksaray, Aksaray Üniversitesi tarafından doğrudan ve dolaylı olarak yayınlanan; kitap, makale, tez, bildiri, rapor, araştırma verisi gibi tüm akademik kaynakları uluslararası standartlarda dijital ortamda depolar, Üniversitenin akademik performansını izlemeye aracılık eder, kaynakları uzun süreli saklar ve telif haklarına uygun olarak Açık Erişime sunar.
Güncel Gönderiler
Reliability of categorization of the shape of the lateral edge of the first metatarsal head in hallux valgus
(Lippincott Williams and Wilkins, 2025) Akgün, Ulaş; Özkan, Deniz; Gültaç, Emre; Canbek, Umut
Hallux valgus is a triplanar deformity with rotation being a significant contributing factor. Several methods exist for evaluating rotational deformity of the first ray, one of which involves assessing the shape of the lateral edge of the first metatarsal head. This study aimed to investigate the interobserver and intraobserver reliabilities of circle measurements on weight-bearing anteroposterior radiographs to categorize the shape of the lateral edge of the first metatarsal head. A power analysis determined that a minimum of 128 radiographs was required to assess observer agreement for categorical data (alpha = 0.05, beta = 0.2, power = 80%). Patients diagnosed with hallux valgus at our institution between January 2015 and December 2019 were retrospectively reviewed and 128 radiographs were randomly selected. Two foot and ankle surgeons and 2 radiologists evaluated the radiographs on 2 separate occasions, classifying the first metatarsal head shape into 3 categories (angular, intermediate, and round) using circular measurements. Interobserver reliability was assessed using Fleiss' kappa, whereas intraobserver reliability was evaluated using Cohen kappa. Interobserver reliability for classifying the shape of the lateral edge of the first metatarsal head was found to be very good in both assessments (Fleiss' kappa = 0.83 and 0.84, respectively). The subcategory analysis revealed the highest agreement for the angular type, followed by the round type, with the lowest agreement observed for the intermediate type. The intraobserver Cohen kappa values ranged from 0.78 to 0.91. The level of interobserver agreement was found to be very good for the classification of the shape of the first metatarsal, and the intraobserver agreements were substantial to very good. In our opinion, this method is reliable and may be useful in determining the necessity for rotation-correcting surgery and advanced imaging with weight-bearing computed tomography.
Acute neurochemical, psychophysiological, and cognitive responses to small-sided games vs. running-based HIIT in young, male soccer players
(Multidisciplinary Digital Publishing Institute (MDPI), 2025) Birinci, Yakup Zühtü; Pancar, Serkan; Soylu, Yusuf; Topçu, Hüseyin; Koçyiğit, Aygül; Sarandöl, Emre; Şimşek, Hasan; Şahin, Şenay
This study aimed to compare the immediate effects of small-sided games (SSGs) and running-based high-intensity interval training (HIITrb) on serum brain-derived neurotrophic factor (BDNF) levels, cognitive performance, and enjoyment in young, male soccer players. Methods: Twenty-four soccer players [age: 19.2 ± 0.8 years] completed one session each of four-a-side SSG or HIITrb in a randomized, counterbalanced, and crossover design, with a one-week washout period. Blood samples and Trail Making Tests (TMTs) A and B were measured before and after exercise. Heart rate (HR) was monitored throughout the games, and ratings of perceived exertion (RPE) and enjoyment were collected at the end of the measurements. Results: The results show no significant effects of time (p > 0.775), group (p > 0.276) or time × group interaction (p > 0.199) on BDNF levels. For TMT-A, the time effect (p = 0.866) and group effect (p = 0.057) were not significant; however, the time × group interaction was significant (p < 0.019), indicating a superior performance in the SSG compared to HIITrb. In the TMT-B, significant effects were observed for both time (p < 0.001) and group (p < 0.001), while the time × group interaction effect was not statistically significant (p > 0.061). Furthermore, enjoyment levels did not differ significantly between conditions (p = 0.976). Conclusions: These findings suggest that four-a-side SSG may enhance processing speed compared to HIITrb without changes in serum BDNF levels. Coaches may consider using 4v4 SSG formats in early training sessions or warm-ups to stimulate processing speed and mental readiness in young soccer players.
Assessment of the domestic sewage sludge by different drying methods: solar radiation and thermal energy source
(Global NEST, 2025) Gök, Gülden; Düzgün, Türkay
The amount and properties of the sludge produced in wastewater treatment plants depend on the composition of the wastewater, the type of wastewater treatment used and the disposal method applied to the mud. The sludge that occurs during mechanical, biological and chemical treatment methods must be subjected to some pre-treatment in terms of both environmental problems and the threat of human health. Sludge samples were taken from the sludge dewatering station, which is the last point of a wastewater treatment plant sludge treatment, and tested in pilot scale hybrid sludge drying system. In the study, drying methods were investigated in the context of urban wastewater treatment plants in Ankara province under the final disposal of sludge from urban wastewater treatment plants. The most suitable solution would be to dry the sewage sludge in Ankara in a hybrid system with solar radiation and thermal energy sources (cogeneration with solar panels) in a system that will provide uninterrupted power to the drying system. This thermal source can be provided from the existing cogeneration system in the plant. Addition of solar panels to the sludge drying system is an important option in order to obtain better efficiency than solar radiation-based drying system.
Microplastics in long-eared owl (Asio otus) pellets: tracing contamination through prey
(Springer Verlag, 2025) Seyfe, Merve; Çırak, Tamer; Kankılıç, Tolga; Tavşanoğlu, Ülkü Nihan
Microplastic pollution is a pervasive global environmental problem affecting ecosystems and pose a potential threat by entering the food chain. Due to their small size, microplastics are easily ingested by organisms at the base of the food web. Owls, as nocturnal predators, are vulnerable to microplastic bioaccumulation through their prey, including small mammals, reptiles, and birds. This study investigates microplastic exposure in long-eared owls (Asio otus) by analyzing their pellet contents. A total of 292 pellets were collected from agricultural (n = 129), steppe (n = 116), and forest (n = 47) habitats in Ankara, Türkiye, over nine months. The most common microplastics found were fibers (78%), followed by films (14%) and fragments (8%), with sizes ranging from 0.5 to 4.4 mm. Microplastic distribution varied across habitats: 63% were found in steppe, 23% in agriculture, and 14% in forests particularly during non-breeding periods. The microplastics included polyethylene terephthalate (PET), ethylene-vinyl acetate (EVA), and polypropylene (PP), among others. Harting’s vole was the primary rodent prey. A significant correlation was found between prey abundance and microplastic levels, suggesting trophic transfer through food webs. Microplastic concentrations were significantly higher in areas characterized by intensified anthropogenic activity. The study underscores the importance of protected areas with strict human activity regulations in reducing microplastic contamination, highlighting the need for targeted conservation and pollution management efforts to protect wildlife and ecosystems.
