Recep Tayyip Erdoğan Üniversitesi Kurumsal Akademik Arşivi
DSpace@RTEÜ, Recep Tayyip Erdoğan 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 yayınların etkisini artırmak için telif haklarına uygun olarak Açık Erişime sunar.
Güncel Gönderiler
Molecular diversity of water mites of the Turkish eastern Black Sea basin, with the description of two new species (Acari, Hydrachnidia)
(Magnolia Press, 2026) Pesic, Vladimir; Bayçelebi, Esra; Zawal, Andrzej; Bankowska, Aleksandra; Jovanovic, Milica; Kumru, Salih; Baytaşoğlu, Hazel; Kalaycı, Gökhan
This study identified water mites collected from coastal streams in the provinces of Rize and Trabzon, which flow directly into the Black Sea, using both molecular and morphological approaches. A total of 42 COI barcodes were generated and clustered into 19 BINs, corresponding morphologically to 15 species. Two species, Hygrobates turani sp. nov. and Atractides karadenizensis sp. nov. (Hygrobatidae), are described as new to science, while Sperchon milisai Pesic, 2022, and Hygrobates grabowskii Pesic, Saboori, Zawal & Dabert, 2019, are newly reported from Turkiye. The study demonstrates that only a small fraction of Turkiye's water mite diversity can currently be identified using existing DNAbarcode libraries, highlighting the need for their further expansion and refinement in future research.
The relationship between chronic intermittent hypoxia and masld and fibrosis in obstructive sleep apnea patients
(Multidisciplinary Digital Publishing Institute (MDPI), 2026) Gül, Sidem; Özyurt, Songül; Keklikkıran, Çağlayan; Gümüş, Aziz
Background/Objectives: Obstructive sleep apnea (OSA) causes recurrent apneas/hypopneas and intermittent oxygen desaturation during sleep. Chronic intermittent hypoxia (CIH) may be linked to metabolic dysfunction-associated steatotic liver disease (MASLD) and fibrosis through metabolic dysfunction. This study evaluated the relationship between OSA severity/hypoxemia indices and MASLD and fibrosis assessed by transient elastography. Methods: We prospectively enrolled 400 adults evaluated for suspected OSA at a respiratory disease outpatient clinic in Rize, T & uuml;rkiye. All patients underwent overnight polysomnography. The apnea-hypopnea index (AHI), oxygen desaturation index (ODI), mean SpO(2), and mean of each participant's minimum SpO(2) values were recorded. MASLD and fibrosis were assessed in the same individuals using FibroScan, with CAP (controlled attenuation parameter) and LSM (liver stiffness measurement) values recorded. OSA severity was categorized by AHI, and multivariable logistic regression was used to identify independent associations. Results: MASLD was present in 76% and fibrosis in 34.5% of patients. Patients with fibrosis had higher AHI (13.8 [8.2-35.2]) and ODI (11.5 [4.5-33.2]) and lower minimum SpO(2) (p < 0.001). In multivariable models, BMI (OR 1.09; p < 0.001) and metabolic syndrome (OR 3.34; p < 0.001) were independently associated with MASLD, while BMI (OR 1.02; p < 0.001), metabolic syndrome (OR 2.03; p = 0.015), and ALT (OR 1.02; p = 0.032) were independently associated with fibrosis. Conclusions: MASLD and fibrosis were associated with OSA severity and hypoxemia before multivariable adjustment. However, after adjustment for obesity-related factors, liver outcomes were primarily explained by BMI and metabolic syndrome. Liver assessment should be considered in patients with OSA, particularly in those with high BMI and metabolic syndrome.
Impact of antimicrobial resistance on outcomes in biliary tract infections: a retrospective study from a tertiary care center
(SAGE Publications, 2026) Özşahin, Aybegüm; İlgar, Tuba; Keklikkıran, Zehra Zeynep
Biliary tract infections (BTI) are common intra-abdominal infections associated with significant morbidity and mortality. We aimed to evaluate the causative agents of BTIs, their resistance profiles, and factors associated with resistant infections and mortality. This retrospective study included patients aged >= 18 years who had bile cultures obtained for BTI between January 2022 and January 2024 in a tertiary health-care center. A total of 148 bile cultures from 101 patients were analyzed. Pathogens were identified in 73% of the cultures; Escherichia coli and Enterococcus spp. were the most common pathogens. Extended-spectrum beta-lactamase (ESBL) production was detected in 37.3% of Enterobacterales isolates, and ampicillin resistance was observed in 50% of enterococci. Among all identified pathogens, 31 (28.7%) were resistant microorganisms. The 30-day mortality rate was 13% and was significantly higher in patients with resistant infection, health care-associated infection, or malignancy. In multivariate analysis, resistant infections were associated with an eightfold increase in mortality. Currently antimicrobial resistance is becoming one of the leading causes of death. Resistant pathogens were frequently identified, even in community-acquired infections, and were associated with a significant increase in mortality. It is crucial to identify factors influencing resistant infections and mortality for optimizing empirical treatment strategies.
Pre-curing time effect on carbon capacity and microscopic properties of paste backfill produced by alumina production solid wastes and its practical application
(Elsevier, 2026) Ma, Junbiao; Bai, Jinwen; Feng, Guorui; Han, Yanna; Yılmaz, Erol
To address the urgent need for CO2 sequestration amid global warming, this study proposes a novel strategy for storing CO2 in goaf areas using tailings-cemented paste backfill (TCPB) derived from alumina production wastes. The influence of pre-curing time (1d, 1.5d, 2d, 3d and 4d) on the CO2 storage capacity and microscopic properties of TCPB was systematically investigated across three curing stages: initial pre-curing (Stage I), CO2 curing for 1d (Stage II), and subsequent conventional curing up to 28d (Stage III). Results indicated that CO2 uptake first increased and then decreased with prolonged pre-curing time, reaching a maximum of 3.14% at 2d. Specimens pre-cured for 2d achieved a compressive strength of 5.18 MPa after Stage III, meeting engineering backfilling requirements. TG-DTG analysis revealed that the total CaCO3 content in these specimens reached 10.68% and 12.65% after Stages II and III, respectively. XRD and FTIR analyses further demonstrated enhanced crystallinity of CaCO3 and a higher degree of silicate polymerization in samples pre-cured for 1 similar to 2d. Microstructural observations confirmed the formation of acicular aragonite and well-crystallized calcite, along with a moderately developed pore structure that facilitated CO2 participation in strength development. This study presents an integrated "backfilling-mining-CO2 storage" strategy, demonstrating that pre-curing TCPB in goaf for 2d enables the sequestration of approximately 708.49 kg of CO2 in a single 6 x 60 x 3 m(3) goaf. The work provides a scientifically grounded and scalable dual solution for industrial solid-waste valorization and CO2 mineralization, offering a synergistic pathway towards systemic cleaner production that combines waste recycling, carbon management and safe mining practices.
AI-driven adaptive vibration control in smart plate systems: a sustainable approach for next-generation sports engineering
(2026) Lin, Bing; Wang, Jinyu; Safarpour, Mehran; Yaylacı, Murat
The current paper proposes an AI-based method for the vibration control of smart plate systems. The application is set for next-generation sports engineering, where performance enhancement is the main goal. The system consists of a core of coarse aggregate ultra-high-performance concrete (CA-UHPA) and piezoelectric face sheets, which are mounted on an elastic foundation. The properties of the material composite are foreseen based on the Halpin-Tsai models and the law of mixtures. Looking into the system's dynamic performance in a very thorough way is done using the quasi-3D theory having four variables. This theory gives the opportunity for the full consideration of the distribution of transverse shear strains and stresses throughout the plate thickness. The governing equations of the resonant response are derived by employing the concept of piezoelectricity together with Hamilton's energy principles. The elastic foundation is analyzed using both Winkler and Pasternak coefficients, thereby allowing the interaction of the plate and its support substrate to be included. The solution is achieved through using the physics-informed neural networks (PINNs) technique, which not only accurately and efficiently replaces the conventional Legendre Polynomial Expansions with deep neural networks (DNNs) for more computational efficiency and accuracy but also doubles the legacy of AI-powered methods in terms of real-time system adaptability and optimal vibration control under changing scenarios. A DNN-based verification process assists in obtaining and confirming the trustworthiness of the results. This research marks above all and the first time as a very promising new direction in the smart systems vibration control area in sports, and it is highly anticipated that the new development will have a positive impact on the performance and durability optimization of advanced sports equipment. The introduced method embodies a patent-driven technology leap in vibration control, where AI and new materials join forces to solve challenging problems.
