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
Regulatory mechanisms and signalling cascades in plant adaptation to heavy metal toxicity
(Springer Nature, 2026) Shah A.M.; Manzoor S.; Altaf, Muhammad Tanveer; Bayramoğlu, Zeynep; Popescu S.M.; Mansoor, Sheikh
Heavy metal stress considerably inhibits plant growth, productivity and ecosystem sustainability. Plants have developed specific physiological, biochemical, and molecular pathways to withstand such stress, including the activation of antioxidant enzymes, regulation of ion transporters, and expression of stress-responsive genes. However, these intrinsic mechanisms are insufficient for provide ample protection against severe or prolonged exposure to heavy metals. Exogenous interventions, including the employment of plant growth regulators, nutrient amendments, and organic supplements, have portrayed the potential to augment plant adaptation to heavy metal contamination. The mechanistic basis of heavy metal tolerance in response to exogenous application encompasses fluctuations in the antioxidant defense system that facilitate the sequestration of reactive oxygen species (ROS), as well as the induction of phytochelatin synthesis for the chelation of metal ions. Furthermore, it involves the regulation of ion transporters to reduce metal uptake and accumulation, the stimulation of plant growth-promoting microbes to enhance plant growth and metal tolerance, and the upregulation of hormone signaling pathways to modulate plant stress responses. This review intends to furnish a comprehensive outline of indigenous pathways as well as the mechanisms of exogenous alleviation strategies that drive plant adaptation to heavy metal stress. A proper understanding of these concepts fosters the development of novel, sustainable approaches to attenuate the adverse effects of heavy metal contamination on plant ecosystems.
Chloroplast genome characterization of Adenophora taquetii and comparative analysis with related Adenophora species
(Genetics Society of Korea, 2026) Han, Song-I; Mansoor, Sheikh; Kim, Jiwon; Morshidi, Nur Azizah Arryanie Binti; Kim, Jae-Hoon; Kim, Jae-Hoon
Background: Adenophora taquetii is an endemic species of Jeju Island, Republic of Korea, and has medicinal and ornamental value. However, genomic resources for this species, particularly the chloroplast genome data, remain limited. Objective: We sequenced, assembled, and characterized the complete chloroplast genome of A. taquetii and compared it with those of other Adenophora species. Methods: Whole-genome sequencing data were generated using an Illumina HiSeq platform. Raw reads were preprocessed using Trimmomatic, mapped with BWA-MEM, and used for chloroplast genome assembly with NOVOPlasty, Fast-Plast, and GetOrganelle. Genome annotation was performed using GeSeq, comparative analysis was conducted using mVISTA in LAGAN mode, simple sequence repeats (SSRs) were identified using MISA, single-nucleotide polymorphism (SNP) matrices were generated using SAMtools, and phylogenetic analysis was performed using maximum likelihood and Bayesian inference based on aligned complete chloroplast genome sequences. Results: The chloroplast genome of A. taquetii was 161,772 bp long and exhibited the typical quadripartite structure of angiosperm chloroplast genomes, comprising a large single-copy (LSC) region (113,770 bp), a small single-copy (SSC) region (27,738 bp), and two inverted repeat (IR) regions (10,132 bp each). Comparative analysis revealed substantial variation in chloroplast genome size among related species, ranging from 157,851 bp in A. stricta to 218,673 bp in A. verticillata. In total, 143 genes were annotated in A. taquetii, including 96 protein-coding, 38 tRNA, and 9 rRNA genes. In addition, 25 SSRs and 1,161 SNPs were identified, and phylogenetic analysis supported a close relationship between A. taquetii and A. stricta. Conclusion: The complete chloroplast genome of A. taquetii provides a useful genomic resource for comparative chloroplast genomics, species identification, and phylogenetic studies within the genus Adenophora.
Degradation-aware multi-objective optimization of wind-battery energy systems using NSGA-II
(Elsevier, 2026) Eroğlu, Hasan
Battery energy storage systems (BESS) are increasingly integrated with wind power plants to mitigate production variability and enhance economic performance in electricity markets. However, optimal battery sizing requires simultaneous consideration of economic profitability, operational smoothing capability, and lifecycle degradation, which inherently represent conflicting objectives. This study proposes a degradation-aware multi-objective optimization framework for wind–battery energy systems using the Non-Dominated Sorting Genetic Algorithm II (NSGA-II). The framework integrates dynamic state-of-charge modeling, equivalent full cycle (EFC) based degradation estimation, and capital recovery factor (CRF) based economic evaluation within a continuous optimization structure. Real operational data consisting of 744 h of wind generation and electricity price information from a 70 MW wind power plant are employed to evaluate system performance. The optimization results reveal a well-defined three-dimensional Pareto surface representing nonlinear trade-offs among net profit, grid injection variance, and battery degradation. The deterministic benchmark identifies a profit-maximizing configuration with a storage capacity of approximately 5.0 MWh and a net profit of approximately $632,687 over the analyzed period. In contrast, the NSGA-II optimization generates a diverse Pareto solution set enabling flexible trade-off analysis. The TOPSIS-based compromise solution selected using weights of 0.50 for profit, 0.25 for variance, and 0.25 for degradation, corresponds to a battery capacity of 10.18 MWh and a power rating of 2.00 MW, achieving a net profit of approximately $266,189 over the simulation period. Pareto quality evaluation yields a hypervolume value of 66,038,808 and a spread indicator of 0.455. The results demonstrate that degradation-aware multi-objective optimization provides a complementary framework for wind–battery system planning, offering diverse Pareto trade-offs unavailable to deterministic sizing approaches.
Microplastics in freshly fallen snow from remote high-altitude ecosystems of the Kaçkar mountains (Southeastern black Sea, Türkiye)
(Elsevier, 2026) Albayrak, Eyüphan; Açıkmeşe, Alperen; Di̇nç, Kadriye; Şentürk Koca, Yasemen; Aytan, Ülgen
Atmospheric transport is a primary mechanism for dispersing microplastics (MPs) to remote high-altitude ecosystems. This study presents the first assessment of microplastic contamination in freshly fallen snow from five high-altitude sites (Handüzü, Çağrankaya, Elevit, Ovit, and Tulumpınar) in the Kaçkar Mountains, Northeastern Black Sea region of Türkiye. Snow samples were collected during the 2023 winter season. The collection took place within 24 h of initial snowfall, guided by real-time meteorological data. MPs were found in snow at all sites, with concentrations ranging from 12 to 104 items L−1. The highest abundance was at Çağrankaya (2550 m, 104 items L−1), and the lowest was at Handüzü (1850 m, 12 items L−1). All detected particles were fibers, predominantly black and blue. The consistent morphotype and colour distribution, together with the remoteness of the sites, suggest that long-range atmospheric transport (LRAT) may be an important pathway of microplastic delivery, rather than local fragmentation alone.These findings highlight that even pristine alpine environments are part of the global plastic cycle and are vulnerable to pollution from distant sources. The release of synthetic fibres during snowmelt may contribute to their transfer into freshwater systems and grazing lands, where they could potentially influence water quality and enter local food webs. These processes may have ecological implications for mountain ecosystems, including endemic species, water resources, and livestock reliant on these environments. This study provides baseline data from a previously understudied region, which may support future monitoring and research on atmospheric MP deposition in remote high-mountain environments.
Hydrogen evolution catalysis at a liquid-liquid interface by WC/NiOx and WC/CoOx
(Elsevier, 2026) Akyıldız, Yiğit Osman; Aslan, Emre; Sarılmaz, Adem; Özel, Faruk; Patır, İmren Hatay
Developing Pt-free catalysts for the hydrogen evolution reaction (HER) is important for sustainable hydrogen production. Here, tungsten carbide (WC)-based hybrid catalysts containing nickel oxide (NiOx) or cobalt oxide (CoOx) surface species were synthesized via a colloidal route and evaluated for decamethylferrocene (DMFc)-driven HER at a water/1,2-dichloroethane (DCE) liquid-liquid interface. The synthesis temperature and nominal oxide loading were optimized, and the resulting catalysts were characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and energy-dispersive X-ray spectroscopy (EDX). Their interfacial HER activity was examined by gas chromatography, four-electrode electrochemical polarization, and in situ UV-visible absorption spectroscopy monitoring of DMFc oxidation to DMFc+. A nominal loading of 7.5 wt% gave the best activity for both hybrids. Compared with the catalyst-free reaction, WC/NiOx and WC/CoOx increased the apparent reaction rate by approximately 89- and 70-fold, respectively, whereas pristine WC gave a 33-fold enhancement. The superior activity of WC/NiOx is attributed to the cooperative role of the conductive WC scaffold, oxide-derived catalytic sites, and more accessible NiOx-containing domains. These results demonstrate that WC/NiOx and WC/CoOx are promising earth-abundant hybrid catalysts for interfacial HER and provide design guidelines for Pt-free oxide-carbide systems.
