Siirt Üniversitesi Kurumsal Akademik Arşivi
DSpace@Siirt, Siirt 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
Recent developments in the thermal radiative flow of dusty Ellis trihybrid nanofluid with activation energy using Hamilton-Crosser thermal conductivity model
(Elsevier BV, 2025-05) Mostafa Mohamed Okasha; Munawar Abbas; Ali Akgül; Shoira Formanova; Talib K. Ibrahim; Murad Khan Hassani
This study scrutinizes the characteristics of activation energy on Darcy Forchheimer radiative flow of dusty Ellis trihybrid nanofluid over a Riga plate when dust and nanoparticles are present. The goal of the present work is to use the Hamilton-Crosser thermal conductivity model to scrutinize the heat transmission for the Darcy Forchheimer flow of dusty Ellis trihybrid nanofluid. The flow is impacted by heat source with the properties of Marangoni convection. The base fluid, propylene glycol (C3H8O2), is mixed with Ag, TiO2 and Al2O3 nanoparticles. The model is applicable to sophisticated heat transfer systems, including solar energy harvesting and electronic device cooling technologies. Additionally, it finds application in thermal management of industrial processes using nanofluids and aerospace engineering. Using the shooting technique, the numerical results of the governing equations are obtained (RKF-45th). The impacts on dimensionless physical quantities of interest of geometrical and physical properties relevant to this study are analysed using the required tables and figures. The results demonstrated that the Ellis fluid parameter raised the heat transmission, mass transmission rate, and velocity profiles. As the chemical reaction parameter upsurges, the concentration distributions decrease.
The Importance of Monocyte-to-High Density Lipoprotein-Cholesterol Ratio in Predicting Severity of Coronary Artery Disease in Acute Coronary Syndrome
(Ovid Technologies (Wolters Kluwer Health), 2025-03) C Kaynak; E Ozmen; M Aslan
Background: Evaluating the association between coronary artery disease (CAD) severity and new inflammatory markers in acute coronary syndrome (ACS) is critical for managing the therapy procedure as well. Aim: The primary goal of this study was to investigate the association between the monocyte-to-high density lipoprotein-cholesterol ratio (MHR), a novel inflammation marker, and the severity of CAD in patients with ACS. Methods: The study was performed on ACS patients who were hospitalized for coronary angiography (CAG) in the coronary intensive care unit and was conducted with a retrospective design. The study comprised 344 patients (mean age 60.49 ± 12.23 years) with ACS who had CAG and laboratory testing. There were 212 patients with mild CAD according to the Synergy between percutaneous coronary intervention (PCI) with Taxus and Cardiac Surgery (SYNTAX) score (SYNTAX score ≤22) and 132 patients with severe CAD (SYNTAX score >22). The association between SYNTAX score, MHR, uric acid, the neutrophil-to-lymphocyte ratio (NLR), and other markers were assessed. All analyses were performed using SPSS 26.0. Results: A modestly linear association was observed between MHR and SYNTAX score (r = 0.522, P < 0.001). Multivariate logistic regression analysis found male gender, high uric acid, high MHR, and NLR as possible individual predictors of SYNTAX score >22 in ACS. The receiver operating characteristic (ROC) analysis revealed that MHR 15.64 (AUC = 0.794; P < 0.001) could predict SYNTAX score >22 with higher sensitivity (81.8%) and specificity (78.3%). Conclusions: The higher MHR independently predicts the severity of CAD in ACS. It may be a better parameter than the higher NLR and uric acid levels to predict CAD severity in ACS patients.
Total Phenolic and Flavonoid Contents of <i>Cymbocarpum widemannii</i> and Their Antioxidant, Antimicrobial, DNA Damaging Activities
(Tech Science Press, 2025) Mehmet Fidan; Behcet Inal; Mesut Sırrı; Bülent Hallaç; Ulutas Mehmet Sefa
The use of conventional herbal medicines is a rapidly expanding phenomenon in developed nations. For instance, 30%–50% of all drug use in China is attributed to traditional herbal preparations. Current study evaluated the antioxidant (DPPH, FRAP), total phenolic and flavonoid content, antibacterial activity, and DNA damage protective potential of aqueous and methanolic extracts obtained from the aerial parts and roots of Cymbocarpum wiedemannii Boiss., an endemic plant in Turkey. In antioxidant analyses, the methanolic extract of the aerial parts showed the highest %DPPH (73.38) and IC50 (3.46 mg/mL) values. The FRAP analysis revealed the highest iron-reducing capacity in the methanolic extract of the aerial parts (108.10 ± 0.11 mg FeSO4/mL). The aqueous extract of the aerial parts exhibited the highest total phenolic content (1.69 ± 0.02 mg gallic acid/mL), while the methanolic extract of the aerial parts had the highest total flavonoid content (13.53 ± 0.09 mg rutin/mL). Antibacterial activity tests showed no significant effect at a concentration of 1 mg/mL for the samples. DNA protective effects were tested on pBR322 plasmid DNA, demonstrating that both aerial and root extracts could protect DNA from Fenton reaction-induced damage. In conclusion, C. wiedemannii exhibits potential bioactive properties, particularly in terms of its antioxidant and DNA protective effects.
Exogenous selenium application enhances the photosynthetic pigment and antioxidant defense of mash bean (Vigna mungo) to confer tolerance to salt stress
(University of Agricultural Sciences and Veterinary Medicine Cluj-Napoca, 2025-03-28) Zain UL ABIDIN; Safura BIBI; Athar MAHMOOD; Sipan SOYSAL; Zeki ERDEN; Çağdaş Can TOPRAK; Kifah GHARZEDDIN; Ibrahim AL-ASHKAR; Ayman EL SABAGH; Nehal ELNAGGAR
Mash bean is an important crop enriched with proteins and highly praised in Pakistan due to its nutritional values. However, due to abiotic stresses like salinity, its production is decreased. This study was conducted to investigate the effect of selenium on mash bean to produce salt tolerance. Mash bean seeds were sown in plastic pots filled with sand. Three levels of NaCl (0 mM, 100 mM, 200 mM) and five levels of selenium (0 ppm, 20 ppm, 40 ppm, 80 ppm, 120 ppm) were applied with Hoagland solution. Salinity reduced plant height (28%), leaf area (33%), chlorophyll a (14%), chlorophyll b (9%), carotenoids (20%), potassium ions, calcium ions, superoxide dismutase, peroxidases, catalase, salt tolerance index and increased sodium ions (21%), H2O2 content as well as secondary metabolites. However, selenium application in low concentration enhanced plant height (31%), leaf area, chlorophyll a (17%), chlorophyll b (12%), carotenoids (40%), potassium, calcium, superoxide dismutase, peroxidases, catalase, salt tolerance index, proline, flavonoids, total phenol, while decreased sodium ions (25%) and hydrogen peroxide content under salt stress. Findings showed important function of selenium in improving physical characteristics, absorption of ions, photosynthetic pigments, and antioxidant defense in plants under salinity. Applying selenium at 40 ppm concentrations showed greatest efficacy in alleviating negative impacts of salt stress (100 mM) on plant growth and biochemical attributes. Maximum positive results of selenium application (40 ppm) were obtained at 0 mM of salinity. The journal offers free, immediate, and unrestricted access to peer-reviewed research and scholarly work. Users are allowed to read, download, copy, distribute, print, search, or link to the full texts of the articles, or use them for any other lawful purpose, without asking prior permission from the publisher or the author. License - Articles published in Notulae Botanicae Horti Agrobotanici Cluj-Napoca are Open-Access, distributed under the terms and conditions of the Creative Commons Attribution (CC BY 4.0) License.
Applications of Environmentally Friendly Metal Oxides as PEM Fuel Cell Cathode Catalysts
(Springer Science and Business Media LLC, 2025-04-10) Orhan Baytar; Ömer Şahin; Abdurrahman Akdag; Gurbet Canpolat; Arzu Ekinci
For the first time, this study investigated the behaviors of CuO and FeO metal oxides synthesized from bean shell extract using an environmentally friendly green synthesis method at varying cell temperatures in PEMFCs according to the amount of Pt used. Analyzed techniques such as XRD, SEM–EDX, TEM, and XPS were used to ascertain the structural and morphological characteristics of the produced catalysts. The performance of the catalysts was evaluated based on the voltage-current density values obtained from PEMFCs at different cell temperatures and increased at higher cell temperatures.At a cell temperature of 70 °C, the Pt-FeO/C and Pt-CuO/C catalysts exhibited higher power values than the Pt/FeO-C and Pt/CuO-C catalysts, containing only half the amount per unit area. The power density values for catalysts were tested as follows: 3380 mW/cm2mgPt for Pt-FeO/C, 1697 mW/cm2mgPt for Pt-CuO/C, 919 mW/cm2mgPt for Pt/FeO-C, and 1264 mW/cm2mgPt for Pt/CuO-C, and these values were determined to be higher than the values measured using the Pt/C (431 mW/cm2mgPt) catalyst. According to the measured current density-power density values, It was determined that the performances of the catalysts were Pt/FeO-C > Pt-CuO/C > Pt/CuO-C > Pt-FeO/C.
