Sürdürülebilir Kalkınma Amaçları
Yazarlar
- Gul, Muhammet(74)
- Akkurt, Nevzat(39)
- Celik, Erkan(35)
- Serdar, Osman(35)
- Güler, Ömer(33)
- Kutlu, Banu(32)
- Paksoy, Mehmet Yavuz(32)
- Yucesan, Melih(31)
- Tekin, H.O.(30)
- Yildirim, Numan(30)
- Yildirim, Nuran Cikcikoglu(30)
- ALMisned, Ghada(28)
- Mete, Suleyman(26)
- Danabas, Durali(20)
- Ince, Muharrem(20)
- Serin, Faruk(20)
- Ates, Mehmet(19)
- Can, Erkan(19)
- Onat, Onur(18)
- Benzer, Fulya(17)
- Kocabaş, Mehmet(17)
- Tanyol, Mehtap(17)
- Kizak, Volkan(16)
- Alataş, Mevlüt(15)
- Aydin, Rahmi(15)
- Kahraman, Gökhan(15)
- Kilic, G.(15)
- Polat, Alper(15)
- Susam, Selim Orhun(15)
- Xu, Qian(15)
- Aslan, Naim(14)
- Guler, Omer(14)
- Gürler, Nedim(14)
- Karatay, Gülnaz(14)
- Utku, Anıl(14)
- Yildirim, N. C.(14)
- Özkul, İskender(14)
- Demirol, Ferhat(13)
- Erguven, Gokhan Onder(13)
- Firat, Erhan(13)
Yayınlar
- MakaleYalnız künye2025Scopus SJRQ2Effects of Teach-Back intervention on teachers’ epilepsy knowledge, attitudes, self-efficacy, and first aid practices
Gürçayır, Dilek; Karabulut, Neziha; Söylemez, Nilgün
Purpose: This study investigates not only the impact of first aid training but also how the Teach-Back method influences teachers’ overall epilepsy knowledge, attitudes toward epilepsy, and self-efficacy in managing epileptic seizures. Methods: A total of 166 preschool teachers who filled out the questionnaire form and gave their consent were included in the study between April and June 2022. A quasiexperimental single-group pre-test post-test design was used in the study, Data were collected using the questionnaire form, Epilepsy Knowledge Scale, Childhood Epilepsy Attitude Scale and General Self-Efficacy Scale. The research data were collected by the researchers through face-to-face interviews. Results: It was determined that the rate of correct answers given by preschool teachers to most questions about first aid practices in epileptic seizures increased significantly after the training (p < 0.05). There was a significant improvement in preschool teachers’ first aid practices at the end of the training compared to before the training. The mean score of the Epilepsy Knowledge Scale before the training was 11.16 ± 4.04, after the training was 14.59 ± 2.08, and the difference was statistically significant (p < 0.001). The mean Childhood Epilepsy Attitude Scale score before the training was 47.90 ± 4.02, after the training was 51.53 ± 4.55, and the difference was statistically significant (p < 0.001). Conclusion: Epilepsy education significantly improved teachers’ knowledge and attitudes towards childhood epilepsy. However, the increase in general self-efficacy remained limited. This situation reveals the necessity of practical and long-term programs in addition to theoretical education.
AtıfScopus2WoS2OpenAlex2
İncele - MakaleYalnız künye2025Scopus SJRQ2Phylogenetic analysis of the nrDNA ITS and cpDNA rbcL sequences of some endemic Dianthus (Caryophyllaceae) species from Türkiye
Sevindik, Emre; Güner, Özal; Yolcu, Seher; Başköse, İsa; Paksoy, Mehmet Yavuz; Khadivi, Ali; Tunç, Yazgan; Yaman, Mehmet
In this study, the phylogenetic relationship of four species of Dianthus genus which are endemic and distributed in Türkiye, including D. zederbaueri Vierch, D. varankii Hamzaoğlu & Koç, D. halisdemirii Hamzaoğlu & Koç, and D. goekayi Kaynak, was determined using nuclear DNA (nrDNA) internal transcribed spacer (ITS) and chloroplast DNA (cpDNA) rbcL regions. After sampling from the plant, DNA was extracted and the ITS (ITS4-ITS5A) and rbcL (rbcLaF-rbcLaR) primers were used to perform PCR amplification. Sequencer 5.4.6. was used to edit the sequences. MEGA 11 software was used to determine the nucleotide ratios, genetic distance matrix, and π = nucleotide diversity. Some species of Dianthus available in the National Center for Biotechnology Information (NCBI) were used to construct maximum likelihood (ML) phylogenetic trees. As a result, based on the ITS analysis π = nucleotide diversity was determined as: 0.001543, and the result of the rbcL analysis π = nucleotide diversity was determined as: 0.000000. In the ITS results, D. halisdemirii, D. superbus, and D. varankii appeared together, while D. zederbaueri and D. aculeatus appeared together. The rbcL results showed that D. zederbaueri and D. varankii were closely related, but the relationship between D. halisdemirii and D. goekayi could not be determined. Furthermore, in the phylogenetic tree constructed by taking the ITS and rbcL sequences of Dianthus, Gypsophila, Silene, Arenaria, Saponaria, Cerastium, Stellaria, Petrorhagia, Minuartia, Agrostemma, and Polycarpon species from NCBI using ITS and rbcL sequences, our endemic Dianthus species appeared in the same group with Petrorhagia, Gypsophila, and Saponaria species. To conclude, our ITS and rbcL results were consistent in determining the phylogenetic relationships of our Dianthus species with other species.
AtıfScopus1İncele - MakaleYalnız künye2025Scopus SJRQ2Comprehensive performance assessment of Bi- and Pb-based alloys for enhanced Gamma-Ray and neutron shielding applications
ALMisned, Ghada; Susoy, Gulfem; Baykal, Duygu Sen; Kilic, G.; Güler, Ömer; Tekin, H.O.
This comprehensive study investigates the radiation attenuation properties of various bismuth (Bi) and lead (Pb) based alloys, with a focus on identifying superior shielding materials for nuclear safety and industrial radiation protection. The research encompasses an in-depth analysis of seven alloys, namely GTSB5, Sn%40Bi, Bi50Sn50, A1, PbAl-4, Safe Alloy, and P1, assessing their efficacy in gamma-ray and neutron attenuation. Utilizing some computational tools, various parameters such as mass and linear attenuation coefficients, half and tenth value layer values, effective atomic and electron numbers, buildup factors, and transmission values were evaluated. Our findings highlight Alloy P1's outstanding performance, attributed to its high density (11.05 g/cm3) and optimized elemental composition, including Silver (Ag). In addition, P1 demonstrates exceptional gamma-ray attenuation across multiple energy spectra and superior neutron shielding capabilities, evidenced by its significant fast neutron removal cross-section (∑R, 0.12003 1/cm). The study revealed that the addition of Ag enhances the photon and beta particle absorption capacity, positioning P1 as a promising material in radiation shielding applications. The correlations between alloy density and gamma-ray shielding properties were particularly notable, with P1's density contributing to its enhanced attenuation capabilities. Furthermore, P1's lower half value layers (1.14469 cm) and tenth value layers (3.80256 cm) at 15 MeV indicate its efficiency in reducing radiation intensity with minimal material thickness.
AtıfScopus3OpenAlex3İncele - MakaleYalnız künye2025Scopus SJRQ2The effect of WC addition on CrMnFeCoNi high entropy alloys: crystal-micro structure, hardness and wear behavior
Taşgın, Yahya; Kanca, M Sait; Kök, Mediha; Anik, Kerem
High entropy alloys are produced by combining four or more elements in close percentage ratios. Recently, these alloys have become the preferred group due to their superior mechanical and thermal properties. In this study, tungsten carbide (WC) was doped into CrMnFeCoNi alloys at different ratios, and the effects of WC and heat treatment on the doped alloys were investigated. XRD, SEM, and EDS analyses, wear tests, and microhardness measurements were performed on the produced samples to examine their microstructural properties. When comparing the heat-treated samples with WC (3%, 5%, and 10% additions) to the untreated samples, it was found that the average hardness values of the heat-treated samples were higher. Although the grain structures of the samples, as observed through XRD, SEM, and EDS, were preserved, their ratios were altered, and the wear tests revealed that the mass losses of the heat-treated samples increased.
- MakaleYalnız künye2025Scopus SJRQ1Effect of Ohmic Heating on the Quality and Nutrient Preservation of Plum Marmalade: A Comparison With Conventional Heating
Ekici, Seymanur; Omac, Basri; Sabanci, Serdal
In this study, plum marmalade was prepared using the ohmic heating method at three distinct voltage gradients (30, 35, and 40 V/cm). The quality properties of the marmalade prepared this way were contrasted with those prepared using the conventional heating method. Total phenolic content (TPC), antioxidant activity (AA), vitamin C content, total color change (ΔE), hydroxymethylfurfural (HMF), and the amount of time needed for the process, including heating and evaporation, were all measured as part of the study. According to the findings, ohmic heating—specifically, a voltage gradient of 40 V/cm—significantly reduced the heating time when compared to the traditional method, which raised the stability of vitamin C, AA, and phenolic compounds. When ohmic heating was used instead of conventional heating, the amounts of TPC, AA, and vitamin C increased by 19.50%, 33.90%, and 149.12%, respectively. In comparison to traditional heating under atmospheric conditions, the results also showed that ohmic heating increased the amounts of gallic acid (40.61%), catechin (40.98%), chlorogenic acid (25.05%), and rutin (24.67%). Furthermore, the results showed that ohmic heating reduced the amount of HMF (34.34%) and ΔE (2.27%) in comparison to conventional heating. TPC, AA, vitamin C, gallic acid, catechin, chlorogenic acid, and rutin were higher than conventional heating; nevertheless, HMF and ΔE were lower than conventional heating at the applied ohmic heating process. The results obtained indicate a strong potential for an ohmic heating system as a rapid heating method for preserving nutritional value.
AtıfScopus6WoS5OpenAlex6İncele - MakaleYayıncıda açık erişim2025Scopus SJRQ1Experimental analysis of a double-slope solar still integrated with parabolic trough solar collector using nanofluid
Tuğan, Volkan; İnallı, Mustafa; Işık, Erdem
The use of solar energy in the treatment of saline water offers a sustainable and low-cost solution to the increasing global fresh water demand. In this direction, solar still systems separate water vapor from saline water by directly using solar radiation and then condense it to obtain pure water. However, their fresh water productivity is relatively low. Therefore, in this study, the fresh water productivity and thermal efficiency of the double slope solar distillation unit integrated with parabolic trough solar collector, which operates completely on solar energy, were investigated experimentally. In addition, the effect of water-based nanofluid containing multi-walled carbon nanotubes on the performance of the solar still was investigated. All the stills produced were compared in terms of fresh water productivity and thermal efficiency. According to the results obtained from the study, the highest daily productivity was found to be 1963.8 g/m2/day, 2008.5 g/m2/day, 2592.0 g/m2/day and 2937.6 g/m2/day for SSSS, DSSS, PTSC integrated DSSS and both NF and PTSC integrated DSSS, respectively. It was observed that the daily productivity of DSSS, DSSS with integrated PTSC, and DSSS with both PTSC and NF were 6.6 %, 42.2 %, and 49.6 % higher than SSSS, respectively. Additionally, it was observed that the thermal efficiency of DSSS using PTSC and NF was lower compared to SSSS due to its larger system area.
AtıfScopus13WoS8OpenAlex10İncele - MakaleYayıncıda açık erişim2025Scopus SJRQ2COVID-19 Alters Respiratory Function Associations in High-Level Athletes
Kabak, Banu; Erdoğan, Murat; Tortu, Erkan; Deliceoğlu, Gökhan; Bulgay, Celal; Kızar, Oktay; Baydaş, Giyasettin; Szabo, Attila
Background and Objectives: Coronavirus disease 2019 (COVID-19) has affected multiple physiological systems, including respiratory function, which is critical for athletic performance. Although alterations in pulmonary dynamics have been observed in high-level athletes recovering from COVID-19, the effects on respiratory function remain unclear. In this context, the present study aimed to examine the impact of COVID-19 on the interrelationships among respiratory function parameters in high-level athletes. Materials and Methods: Sixty-eight high-level athletes participated in the present study, including 34 with a history of COVID-19 and 34 controls without prior infection. Respiratory function and respiratory muscle strength were assessed using a digital spirometer (Pony FX, Cosmed, Italy). Key variables included Forced Vital Capacity (FVC), Peak Expiratory Flow (PEF), Maximum Voluntary Ventilation (MVV), Forced Expiratory Volume in one second (FEV1), and Maximum Inspiratory/Expiratory Pressure (MIP/MEP). Results: High-level athletes with prior COVID-19 infection exhibited significant differences in the correlations (p < 0.05) between FVC and PEF, FVC and MVV, FEV1 and FEV1/FVC, and MIP and MVV compared to controls. Conclusions: These findings suggest that COVID-19 can disrupt the interrelationships among respiratory function parameters in high-level athletes, highlighting the need for further longitudinal investigations.
AtıfScopus1OpenAlex1İncele - MakaleYalnız künye2025Scopus SJRQ1Median-Linear model for solar radiation estimation by comparison with ANFIS and Angström-Prescott methods
Acar, Ramazan; Saplıoğlu, Kemal; Güçlü, Yavuz Selim
This paper aims to propose a novel approach to estimating solar radiation in relation to sunshine duration. A hybrid Median-Linear (MedLin) model is presented including both the median value and the linear solar radiation equation. First stage is concerned with two-stage alternative of the proposed model with inputs and outputs exhibiting a seasonality structure and it is seasonally adjusted using median values. In the second stage, the linear equation for the difference values is determined with estimations the difference in solar radiation. Finally, the median value and the estimated difference value are added. Monthly total solar radiation values are estimated using monthly total sunshine duration data from Mardin, Adana, Bozova, Hakkari, Şırnak, and Van stations in Southeast of Türkiye for the application. The predictions of the MedLin approach are compared with the results of the Angström-Prescott, ANFIS, and Mean-Linear (MeanLin) models. As for the prediction of monthly total solar radiation data at Mardin and Hakkari stations, the proposed MedLin approach yields the best results compared to other methods with mean absolute percentage error 3.508% and 8.951%, respectively. Angström-Prescott model for Adana, MeanLin method for Bozova, ANFIS model for Şırnak, and MeanLin model for Van provided the best predictions with mean absolute percentage error 3.721%, 3.285%, 4.278%, and 13.101%, respectively. The results show that the MedLin technique proposed in this paper is useful for solar radiation estimation.
AtıfWoS1İncele - Kitap BölümüYalnız künye2025Effects of digital transformation on cost and management accounting
Uluç, Seher Meral
- MakaleYalnız künye2025Scopus SJRQ3Infection transmission risk analysis in Covid-19 intensive care nurses
Şahin, Melek; Şenel, Bilgin; Şenel, Mine; Ünlükal, Ceren
The coronavirus pandemic, which affects the whole world, continues to spread rapidly. The pandemic has reached a serious extent and the risks are getting deeper. The sector most affected by the pandemic has been the health sector and health personnel have become an indispensable element of this process. The people at highest risk of being infected are nurses who are in contact with or are responsible for the care of COVID-19 patients. This study was conducted to investigate the transmission risk of COVID-19 infection among nurses who care for patients in intensive care units.In this study, to prevent the transmission of infection from patient to nurse, possible failures in the process were determined by experts selected from nurses, and risk analyses were performed using Failure Mode and Effects Analysis and Entrophy-based Grey Relational Analysis methods. In this study, the three most probable and high-priority failure types were determined in the failures made in the procedures for the transmission of the infection from the patient to the nurse.There is a need to increase the quantity and quality of intensive care unit care personnel to manage new waves of COVID-19 or possible pandemic situations effectively.
- MakaleYalnız künye2025Scopus SJRQ2Evaluation of Nano-Zinc Borate Effects on Thermal Properties, Morphology, Antibacterial Activity, and Drug Release Behavior of Starch/Gelatin Hydrogel Films for Biomedical Applications
Koçak, Berna; Gürler, Nedim; İpek, Yeliz; Yazdıç, Ferit Can; Karaman, Altuğ
Starch and gelatin offer opportunities for use due to their non-toxicity, biocompatibility, physical and functional properties. In this study, different amounts of nano-zinc borate were added to starch/gelatin composition for biological applications and their properties were studied. The structure of the films was investigated by various techniques. Nanostructured zinc borate was synthesized using a chemical method and particle sizes were determined as 196 nm. The atenolol drug was doped into the polymer composite. The atenolol release was performed at pH 7.4 and in phosphate-buffered saline solution medium. Cumulative drug release was 76% with the inclusion of nano-zinc borate in the polymer mixture. The atenolol release was approximately 50%–70% in films with nano-zinc borate added after 300 min. Furthermore, thermal resistance of the films improved with the addition of nano-zinc borate. The investigated chemical compound exhibited pronounced antibacterial activity against Gram-positive bacteria (Bacillus subtilis and Staphylococcus aureus), with significantly greater potency compared to Gram-negative bacteria (E. coli and Pseudomonas aeruginosa). Notably, the formulation containing 1.5% starch, 0.5% gelatin, and 1% nano-zinc borate demonstrated broad-spectrum efficacy against all tested pathogens, highlighting its potential as a promising antibacterial agent. The observed differential activity against bacterial strains suggests that fine-tuning the concentrations of starch, gelatin, and nano-zinc borate may optimize antibacterial efficacy and broaden the spectrum. The results showed us that non-toxic and biocompatible polymer films can be realized in pharmaceutical industry systems and biomedical applications.
- MakaleYalnız künye2025Scopus SJRQ2Hydrocolloid materials of fish bone-derived in edible films: can hydroxyapatite be an alternative approach to improving fillet shelf life?
Alak, Gonca; Kuzgun, Nermin Karaton
The valorization of industrial fish waste has gained significant scientific interest due to its integrated benefits such as waste management and resource recovery. The aim of this study is to evaluate the effectiveness of fish bones, which is one of the wastes of aquaculture processing and constitutes approximately 9–15% of the waste generated as a result of the process, as a preservative in the food industry within the scope of green chemistry applications, sustainability and green product targets. In line with this objective, in the first stage, hydroxyapatite (HAP) was obtained from the fish bones, in the second stage, chitosan (Ch)-based coating solutions were enriched with HAP at different levels (0.02, 0.04 and 0.08 g / L) and in the last stage, fillets were coated with this solution and fillet quality parameters were monitored by microbiological, chemical and sensory analyses at certain intervals (0, 3, 6, 9 and 12 days) during 12 days of storage (at + 4 °C). Based on the data obtained during the storage period, the shelf life of control (Chitosan, Ch). chitosan + low HAP (Ch + L-HAP) and chitosan + medium HAP (Ch + M-HAP) fillet groups increased by 50%, 26% and 20%, respectively, compared to chitosan + high HAP (Ch + H-HAP). In the findings obtained, it was determined that the high concentration application (Ch + H-HAP) had a negative effect on all the parameters studied in fillets, and when the data on the last day of storage, especially the microbiological results were taken into consideration, it was determined that the shelf life decreased by 20–50% on average compared to the other concentrations (Ch + L-HAP and Ch + M-HAP) and Ch group and caused serious negativities in sensory parameters. Based on this result, it would be useful to try low and medium levels of this compound in different combinations. These findings indicate that HAP-enriched chitosan coatings have potential as a promising delivery system for the effective and controlled transport of bioactive ingredients in the food industry.
AtıfScopus5WoS5OpenAlex5İncele - MakaleYalnız künye2025Scopus SJRQ2Nanoarchitectonics and radiation mitigation in Sm2O3-doped lithium borotellurite glass systems: From amorphous harmony to localized order
Kilic, G.; Durmus, Hasan; Birdogan, Selçuk; Ilik, E.; Perişanoğlu, Esra Kavaz; Saltık, Sevda; Guler, Ömer; ALMisned, Ghada; Tekin, H.O.
In this study, a novel series of nano-Sm2O3-doped lithium borotellurite glasses was synthesized and systematically investigated in terms of their structural, physical, and radiation shielding characteristics. X-ray diffraction confirmed the amorphous nature of all samples, while transmission electron microscopy revealed progressive nanoarchitectural refinement and particle growth with increasing Sm2O3 content, from uniformly dispersed nanodomains to dense agglomerates exhibiting short-range crystalline ordering. Energy-dispersive X-ray spectroscopy and elemental mapping validated the homogeneous incorporation of boron, oxygen, tellurium, and samarium throughout the glass matrix without phase separation. Gamma-ray shielding evaluations showed enhanced mass attenuation coefficients and reduced half-value layers, particularly in the Sm(n)8 sample, with significant performance gains at lower photon energies. Neutron shielding assessments further indicated elevated macroscopic removal cross-section values and dose attenuation, affirming the compositional benefit of Sm2O3 for fast neutron mitigation. It can be concluded that nano-Sm2O3 incorporation would play a multifunctional role on structural and radioprotective properties in addition to morphostructural features of lithium borotellurite glasses.
AtıfScopus5OpenAlex6İncele - MakaleYalnız künye2025Scopus SJRQ2Investigation of Mechanical Properties of Jute and Tea Waste-Reinforced Epoxy Composite Material Produced by Vacuum Assisted Resin Infusion Molding
Dogan, Akar; Mahmat, Aybars; Agar, Salih
Recently, the production of materials obtained from plant sources has been increasing due to their environmentally friendly and sustainable sources. Natural fibers and waste materials offer a remarkable alternative in composite production due to their biodegradability, low cost and renewability. In this study, composite materials were produced using hybrid Jute and industrial tea waste-reinforced epoxy materials by vacuum assisted resin infusion molding. In this context, the reason for using natural and industrial resources such as jute fiber and tea waste is to contribute to both the improvement of mechanical properties and the reduction of environmental impacts. It was observed that tensile and flexural strength decreased as the amount of tea waste increased. Conversely, the energy absorbed during the quasi-static punch shear and Charpy impact tests increased, unlike the tensile and flexural strength. Approximately 50% decrease was observed in the tensile strength of the 60% tea waste reinforced material compared to the pure jute composite material. In Charpy impact and quasi-static punch shear tests, a 5% increase in the energy absorbed in the 60% tea waste reinforced composite materials was obtained.
AtıfScopus2WoS1OpenAlex1İncele - Derleme MakaleYalnız künye2025Scopus SJRQ2A critical review of the refractory high-entropy materials: RHEA alloys, composites, ceramics, additively manufactured RHEA alloys
Guler, Seval Hale; Yakin, Alican; Guler, Omer; Chattopadhyay, Arun K.; Simsek, Tuncay
In this study, the traits, production methods, and applications of refractory high-entropy materials—including refractory high-entropy alloys (RHEAs), refractory high-entropy composites (RHE-Cs), and refractory high-entropy ceramics (RHE-Ce)—which are part of the broader category of refractory high-entropy materials with a wide range of applications, have been thoroughly examined and discussed. RHEAs have emerged as materials that exhibit superior properties, such as high melting temperatures, excellent temperature resistance, and high wear and corrosion resilience, in addition to high mechanical and fatigue strength. These attributes have made them extensively studied materials in recent times. The properties of RHEAs suggest their safe operation in challenging environments such as nuclear reactors, gas turbines, aerospace, and energy production. Among refractory materials, RHE-Cs stand out for their high strength and low density, showing significant potential for use in the automotive, aerospace, and space industries. Another group with a wide range of applications, RHE-Ce materials, is distinguished by their high-temperature resilience, high hardness, and low thermal conductivity, making them suitable for high-temperature environments. Refractory materials are generally fabricated using traditional techniques such as arc melting, powder metallurgy, and magnetron sputtering. In this study, along with traditional production methods, additive manufacturing techniques which have revolutionized the manufacturing field are discussed concerning their applications in refractory material production. Additive manufacturing methods enable the achievement of high temperatures and the production of homogeneous, single-phase solid solutions, making them suitable for fabricating refractory materials with high melting points.
AtıfScopus37WoS35OpenAlex41İncele - MakaleYalnız künye2025Scopus SJRQ2Enhanced gastrointestinal disease classification using a convvit hybrid model on endoscopic images
Utku, Anıl
Endoscopy is a procedure that allows examination of the gastrointestinal system, including the stomach, esophagus, large intestine, and duodenum, with the help of an endoscope. Processing of endoscopic images is important for early detection and treatment of gastrointestinal diseases. In this study, hybrid ConvViT was developed using CNN and ViT to increase the classification accuracy of pathologies in gastrointestinal endoscopic images. CNNs are well-suited for capturing local spatial features through hierarchical convolutions, making them highly effective in detecting fine-grained textures and edge patterns. These capabilities complement the ViT’s global attention mechanism, which excels at modeling long-range dependencies in images. The motivation of this study is to increase the classification accuracy and reliability with the ConvViT model, which was developed by combining the practical features of CNN and ViT models, which are individually successful in different aspects of image processing. The ConvViT model was compared with VGG-16, ResNet-50, Inception-V3 and ViT. Comparable models were tested using a gastrointestinal endoscopic image dataset containing ulcers, polyps, inflammation, bleeding, and regular anatomical features. Experiments showed that ConvViT had better prediction performance than compared models, with 95.87% classification accuracy.
AtıfScopus5WoS2OpenAlex2İncele - MakaleYalnız künye2025Scopus SJRQ2Chromium removal with walnut shells and oak branches, adsorption studies, and kinetics
Fırat, Tülay
This study investigates the chromium sorption properties of walnut shells (WS) and oak branches (OB), both of which were modified using NaOH and lactic acid treatments. The characterization of these adsorbents was carried out using Fourier-transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), scanning electron microscopy (SEM), point of zero charge (pHpzc) analysis, and Brunauer–Emmett–Teller (BET) surface area measurements. According to BET results, WS exhibited higher surface area values compared to OB. The pH and pHpzc measurements revealed that acidic functional groups are more prevalent than basic ones on both adsorbents. Batch experiments were conducted to evaluate the chromium ion sorption capacities of WS and OB. To further understand the adsorption mechanism, the Langmuir, Freundlich, and Dubinin-Radushkevich (D-R) isotherm models were analyzed, with the Langmuir and Freundlich models being widely recognized for describing adsorption in single-solute systems. The equilibrium data aligned best with the Langmuir isotherm, while the kinetic data were modeled using pseudo-first-order and pseudo-second-order kinetics. The maximum chromium sorption capacity for WS was determined to be 30.51 mg/g. The energy values calculated from the D-R equation for chromium adsorption onto WS and OB were 13.49 kJ/mol and 15.71 kJ/mol, respectively, indicating that the adsorption process is primarily driven by physical adsorption.
AtıfScopus3WoS3OpenAlex1İncele - MakaleYalnız künye2025Scopus SJRQ3Antioxidant Enzyme Responses to Lead Exposure in Daphnia magna
Sahilli, Yeliz Cakir
Abstract: Lead (Pb), a pervasive environmental contaminant, poses significant toxicological risks to freshwater ecosystems. Daphnia magna, a widely used model organism in aquatic toxicology, provides valuable insights into the sublethal effects of heavy metal exposure. This study investigated the effects of Pb exposure on antioxidant defense mechanisms in D. magna. Test organisms were exposed to aqueous Pb solutions at varying concentrations (0, 10, 20, 30 μg/L) for 96 h. The enzyme activities of glutathione peroxidase (GPx), catalase (CAT), and superoxide dismutase (SOD) were measured using enzyme-linked immunosorbent assay (ELISA). SOD activity did not differ significantly between the exposed and control groups. However, CAT activity showed a significant decrease in all Pb-exposed groups compared to controls. GPx activity exhibited a non-significant decrease. In conclusion, Pb exposure may induce oxidative stress by generating reactive oxygen species (ROS) and inhibiting the function of sulfhydryl-containing antioxidant enzymes. Changes in antioxidant enzyme activity may serve as early biomarkers in ecotoxicological assessments of Pb pollution in aquatic environments. It is suggested that future studies incorporate molecular-level endpoints and chronic exposure scenarios to better elucidate the long-term impacts of Pb on aquatic invertebrates.
- MakaleYalnız künye2025Scopus SJRQ3Symmetry and Curvature in LP-Kenmotsu Manifolds with Generalized Tanaka-Webster Connection
Prakasha, D.G.; Deepika, M.V.; Ünal, İnan
In this study, we investigate Lorentzian para-Kenmotsu (LP-Kenmotsu (LPK)) manifolds in the context of the generalized Tanaka-Webster connection, denoted as D*. Initially, we derive the formulas for the curvature tensor, Ricci tensor, and scalar curvature of an LPK manifold with respect to the connection D*. We analyze the geometric properties of these manifolds, including their local symmetry, Ricci semi-symmetry, and local ψ-symmetry. Furthermore, utilizing the Q-curvature tensor, we analyze conditions under which LPK manifolds exhibit Q*-flatness, Q*-Ricci semi-symmetry, and ψ-Q*-flatness concerning the connection D*.
- MakaleYalnız künye2025Scopus SJRQ3Production and Partial Characterisation of Bifunctional Cellulase Genes of Anaerobic Gut Fungus Orpinomyces sp. GMLF19
Yazdic, F.C.; Akyol, I.; Ozkose, E.
Abstract: Fiber-degrading properties of anaerobic gut fungus, Orpinomyces sp. GMLF19, were investigated when it was grown on various carbon sources, namely carboxymethylcellulose, barley, oat, corncob and wheat straw. Fungi were developed under anaerobic conditions, and carboxymethylcellulase (CMCase), lichenase, and xylanase activities were determined by using DNS method. Meanwhile, the decreasing order of the enzyme activity of Orpinomyces sp. GMLF19 was observed to be lichenase > CMCase > xylanase. Relative activities of these enzymes in the isolate GMLF19 were found to be the highest when the culture was grown for 5 days. Cellulase gene domain was reproduced from chromosomal DNA and transferred into Escherichia coli with the aid of pCT plasmid vector and CMCase, lichenase and xylanase activities were determined using DNS method. The gene showed relatively higher CMCase activity and moderate lichenase activity while no xylanase activity was observed suggesting that the gene is bi-functional. The cell-associated activity of overexpressed Cel19 enzyme (E. coli cells containing this transferred gene were designated as C19) was relatively higher than extracellular activity. It was also recorded that this gene has 2 dockerin domains and 1 catalytic domain with the length of 1.585 bp, and it coded 50.59 kDa size of the protein which belongs to glycosyl hydrolase family 6.
AtıfOpenAlex1İncele