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
Enhancing Tomato (Solanum lycopersicum L.) Resistance Against Bacterial Canker Disease (Clavibacter michiganensis ssp. michiganensis) via Seed Priming with β-Aminobutyric Acid (BABA)
(MDPI AG, 2025-05-25) Nazlı Özkurt; Harun Bektas; Yasemin Bektas
Many stressors contribute to productivity and quality losses in agricultural production, ranging from the rising global population to shrinking agricultural lands. To boost yield and quality, plants must be protected from abiotic and biotic stressors. Seed priming is the process of boosting germination and seedling development by treating seeds with particular pre-treatments before germination. Seed priming is used to improve plant yield and germination. Plant defense elicitors stimulate the plant's natural immune system when administered externally, strengthening the plant and making it more resistant/tolerant to diseases. beta-Aminobutyric Acid (BABA) is a plant defense elicitor, and in this study, the effect of BABA seed priming on Clavibacter michiganensis ssp. michiganensis (Cmm), which causes bacterial cancer in tomato (Solanum lycopersicum L.), was investigated. Tomato seeds were subjected to seed priming for 72 h with 12 mM BABA (BABA priming) or water (water priming) as the control group. Tomato seedlings that germinated normally were utilized as a positive control. When the plants reached the 3-4 leaf stage, they were infected with Cmm. According to the data, BABA priming was the most effective experimental group in reducing disease severity. Furthermore, it has been shown that the use of BABA as a spray or water-priming application gives better protection than the control treatment. To understand the molecular basis of this suppression, plant samples were obtained at two separate time points (0th and the 7th day), and transcriptional changes of essential plant immunity genes (NPR1, PAL, PR1, WRKY70, WRKY33b, TPK1b, and PR5) were studied. The qRT-PCR results showed that NPR1 gene expression increased considerably with the BABA priming treatment compared to the control. BABA priming at the 0th hour enhanced NPR1 gene expression by approximately five times. In addition, BABA priming increased PR1 gene expression. Furthermore, foliar spraying of BABA (BABA priming+BABA-Sp) on seed-primed plants resulted in a nine-fold increase in PR1 gene expression. At day 7, the BABA priming+Cmm treatment increased PR5 gene expression. Along with the control of other genes, the molecular architecture of BABA seed priming has been attempted to be discovered. The application of BABA seed priming is expected to contribute to the literature and have favorable impacts on plant protection against Cmm.
Suppressing Calcium Deactivation in Selective Catalytic Reduction of NOx from Diesel Engines Using Antimony
(MDPI AG, 2025-06-17) Ibrahim Aslan Resitoglu; Ali Keskin; Bugra Karaman; Himmet Özarslan
The selective catalytic reduction (SCR) of NOx emissions by hydrocarbons (HCs) using a silver (Ag)-based catalyst offers significant advantages over conventional SCR systems that rely on ammonia reductants and vanadium-based catalysts. However, the conversion rate of SCR is influenced by several factors, among which catalyst poisoning is a major concern. Toxic metals such as sodium (Na), potassium (K), magnesium (Mg), and calcium (Ca) can degrade catalyst activity and lead to deactivation. Poisoned catalysts suffer from reduced conversion rates and premature deactivation before reaching their intended operational lifespan. In particular, calcium poisoning results in the formation of CaO (calcium oxide), which reacts to produce a CaWO4 compound that severely impairs SCR performance. This study investigates the role of antimony (Sb) in mitigating Ca-induced deactivation in HC-SCR of NOx. Five catalysts with varying Sb loadings were prepared and tested to evaluate Sb's effect on NOx conversion rate at a space velocity of 30,000 h-1. The results demonstrate that Sb effectively suppresses Ca deactivation, enhancing the conversion rate across all engine test conditions. The highest NOx conversion rate (95.88%) was achieved using a catalyst with 3% Sb.
FLIP BIFURCATION AND NUMERICAL STUDY OF CRIMEAN–CONGO HEMORRHAGIC FEVER WITH SUSTAINABLE FRACTIONAL APPROACH
(World Scientific Pub Co Pte Ltd, 2025-06-24) AQEEL AHMAD; ALI RAZA; MUHAMMAD FARMAN; ALI AKGÜL; MUHAMMAD NAUMAN ASLAM; DUMITRU BALEANU; SUHAD ALI OSMAN ABDALLAH; N. S. ABD EL-GAWAAD
The analysis and investigation of Crimean-Congo Hemorrhagic Fever transmission throughout the population are the goals of this study. Using Atangana-Baleanu's-Caputo (ABC) sense concept, the mathematical model is transformed into fractional order for ongoing surveillance of Crimean-Congo hemorrhagic fever. To comprehend the stable state, a qualitative and quantitative investigation of the suggested fractional-order system is conducted. The system's sensitivity analysis is examined to see how sensitive certain parameters are and to see how quickly various factors change and effect the spread of illness. Using flip bifurcation, the local stability of the system with the impacts of both people and animals is confirmed and assessed. The global stability of the system is also examined with Lyapunov first derivative functions. The existence and positivity of the global derivative are shown to be confirmed using Lipschitz criteria for the rate of effects according to their sub-compartments and linear growth on a global scale. The sophisticated tool Atangana-Toufik scheme for various fractional values is used to create solutions for the fractional-order system together with error analysis verification. The real behavior of the Crimean-Congo Hemorrhagic Fever spread and ongoing surveillance are observed using simulations. This kind of research will help to comprehend the epidemic and will have ramifications for real data as well as future control methods.
Temporal analysis of agricultural water footprint dynamics in Türkiye: Climate change impacts and adaptation
(Elsevier BV, 2025-08) Muhammed Sungur Demir; Abdullah Muratoglu; Veysi Kartal; Hüsamettin Nas
Climate change intensifies pressures on agricultural water resources, particularly in arid and semi-arid regions. This study evaluates the interplay between climate variability and agricultural water footprint (WF) dynamics in Türkiye from 1990 to 2019, integrating trend analyses of WF components, virtual water content (VWC), and climate parameters. We assessed temporal trends and correlations using the Mann-Kendall test, Sen's slope estimator, and Innovative Trend Analysis, focusing on 11 major crops. While some crops, like alfalfa, showed decreased yields and increased VWC, key crops (maize, wheat, cotton) exhibited substantial yield improvements, with some showing VWC reductions of up to 46 %. A key finding is that socio-economic and technological advancements have offset the negative effects of rising temperatures and declining relative humidity on evapotranspiration, leading to an overall reduction in the total agricultural water footprint. However, blue WF concurrently increased, signaling a growing reliance on irrigation. Climate correlations revealed distinct seasonal influences: June–July precipitation was inversely correlated with blue WF (r = −0.531), while spring (March–May) rainfall positively influenced green WF (r = 0.412). The observed decoupling of agricultural productivity growth from total WF reduction highlights the importance of technological advancements and optimized water use. However, the rising blue-to-green water ratio underscores sustainability risks in groundwater-dependent systems. These findings advocate for crop-specific adaptive strategies and integrated policies to reconcile agricultural productivity with water resource resilience under climate change. This study provides a framework for guiding sustainable water management in water-stressed regions facing climatic uncertainty.
Optimization study of a hybrid renewable energy system for co-production of electricity and heat at a hydrogen refuelling station
(Elsevier BV, 2025-07) Berna Burcu Kalyoncu; Yavuz Kırım; Hasan Sadikoglu
The purpose of this study is to identify the best hybrid renewable energy system (HRES) configuration for a hydrogen refuelling station located in Schleswig, Holstein. Techno-economic analysis and configuration simulations are performed using the Hybrid Optimization of Multiple Energy Resources (HOMER) Pro program. Initially, HRES powered by photovoltaics (PV) and two different wind turbines (WT) are proposed, achieving 100 % renewable fraction. Alternative configurations include a thermal load controller (TLC), a boiler and a micro gas turbine (MGT). The renewable fractions of these configurations are reduced to over 40 %. The best system configuration comprises PV panels, XANT L-36 WT, Vestas V47 WT, hydrogen storage tank, electrolyser, battery, TLC, boiler, and MGT, with net present cost (NPC) of $6.28 million. Furthermore, four regression models are utilized for the econometric evaluation of global green hydrogen production in the R programming language (R). The ridge regression (RR) model demonstrates the best performance, providing a good fit for our data.
