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Koleksiyondaki öğeler
- MakaleYalnız künye2023Scopus SJRQ1Buoyancy-driven flow and thermal activity of nano-enhanced phase change material in inversed U-shaped chamber
Younis, Obai; Abderrahmane, Aissa; Laidoudi, Houssem; Akkurt, Nevzat; Fadhl, Bandar M.; Guedri, Kamel
This work aims to contribute to the positive evolution towards a green world and green energy by studying the natural convection of Nano-Enhanced Phase Change Material NEPCM in an inverted U-shaped cavity. The side walls of the cavity are kept at a cold temperature, while the upper corrugated wall and the lower wall are insulated with the expectation of the hot square body. The governing equations were solved numerically using the Galerkin finite element method (GFEM). The effects of the following factors on the heat transfer rate are presented and discussed: Rayleigh number (Ra = 103–106), number of ripples of the upper wall (N = 1–4), position of the square body (left, centre, and right), volume fraction of nanoparticles (ϕ = 0–0.08), and magnetic field strength (Ha = 0–100). It was found that the effect of N on the heat transfer rate was insignificant, while increasing ϕ reduced the heat transfer rate. In addition, placing the square body near the cold sidewalls (left or right position) improved the averaged Nusselt number (Nuavg), especially at low values of Ra. At the highest Ra studied, increasing Ha reduced the Nuavg by 15 %.
AtıfScopus11OpenAlex9
İncele - MakaleYalnız künye2023Scopus SJRQ1The structure, optical basicity, ligand field strength and shielding parameters of alkali/alkaline borate glasses doped with V2O5
Sayyed, M.I.; Abdel-Ghany, A.M.; Askin, A.; Sedqy, E.M.; Sadeq, M.S.
In this work, we study the structural, optical and radiation shielding properties of Na2O–CaO-borate glass doped with different amounts of V2O5. A glass system with the composition (10.5CaO+ 16.5Na2O+ (73-x)B2O3+ xV2O5; where x = 0, 2.5, 5 and 10.5 mol%) was produced following the melt quenching technique. The molar volume and density of glasses both increase with the increase in V2O5:B2O3 ratios. Moreover, the average ligand field strength reduced from 2.32 to 2.15 × 1016 cm2 with the increase in V2O5:B2O3 ratios, which correlates with the increased values of molar volume and interatomic separations. Furthermore, the optical basicity of the glass samples increased from 0.601 to 0.666 with increasing V2O5:B2O3 ratios. The optical absorption spectra are studied for further investigation of the optical features. To extract the absorption edge and the absorption bands, a deconvolution process was applied to the absorption spectra. The obtained bands from this deconvolution process confirmed the presence of vanadium in its oxidation states V3+, V4+ and V5+. Furthermore, more additions of V2O5 produced an obvious reduction in Eg values from 3.69 to 3.08 eV along with a redshift in the fundamental absorption edges. These results were attributed to the further creation of nonbridging oxygens within the glass matrix. Furthermore, the addition of V2O5 rather than B2O3 enhances the radiation shielding parameters. Accordingly, the CaNaBV10.5 glass sample is the best attenuator among the fabricated CaO–Na2O–B2O3–V2O5 glasses due to the highest mass attenuation coefficient and lowest half-value layer. Moreover, the half-value layer values of the present glasses were compared to some common materials in the radiation shielding field. From this comparison, we concluded that all glass samples are better than commercial glass windows and ordinary concrete.
AtıfScopus19OpenAlex21İncele - MakaleAçık Erişim2024Scopus SJRQ1Local site effects at the selected stations affected by the February 6 2023 Türkiye Earthquake Sequences
Ilhan, Okan; Indır, Onur; Muratoğlu, Gamze; İçen, Abdullah; Albayrak, Kubilay; Sandıkkaya, M. Abdullah; Askan, Ayşegül; Arduino, Pedro; Taciroğlu, Ertuğrul
This paper explores the applicability of one-dimensional (1D) nonlinear (NL) and equivalent-linear (EL) site response analyses (SRA) for characterizing site effects at selected strong ground motion stations impacted by the February 6, 2023 Türkiye earthquakes. The 1D NL simulations generally underestimate site response at softer sites and for long periods likely due to basin effects and the uncertainties associated with site properties and the 1D approximation. The inclusion of the high-frequency spectral decay parameter (κ0) in 1D simulations decreases the prediction bias of nonlinear SRA, especially at soft sites for short periods. Moreover, the theoretical transfer functions (TTFs) are demonstrated to capture the fundamental site period through in horizontal-to-spectral vertical ratio (HVSR) using ground motion data before and after the February 6, 2023 main event.
AtıfScopus22OpenAlex27İncele - MakaleYalnız künye2023Scopus SJRQ1Heat loss optimization and economic evaluation of a new fourth generation district heating triple pipe system
Chen, Xingli; Ren, Ling; Zheng, Qiang; Yang, Gang; Akkurt, Nevzat; Liu, Lin; Liu, Zhiwei; Qiang, Yujie; Yang, Huachao; Xu, Qian
In response to the heat loss caused by the temperature difference between the heating pipes and external environment during the pipe transportation, heat contradiction between the total heat loss of the piping system and heat transfer between tubes, as well as economic balance between the cost of heat loss and cost of material loss. Based on TOTS (Two-supply/One-return, triple pipe structure) heat loss theory of the fourth-generation district heating system, this paper optimizes structure of pipes by setting dimensionless characteristic parameters θ and β. Finally, a mathematical model is proposed to calculate economic efficiency of pipeline network by considering the cost of initial construction material loss and operation heat loss of the pipe. Results show that, from energy perspective, comprehensive heat as system energy consumption evaluation index is positively correlated with θ, decreases first and then increases as β increases. Total heat loss of system dominates comprehensive heat. Lowest comprehensive heat of system is 18.12 w/m for θ of 0.1945 and β of 0.0739. From economic perspective, total system loss cost as system economic evaluation index is positively correlated with both θ and β. Total system heat loss cost dominates total system loss cost. Lowest total system loss cost is $29.39/m for θ of 0.1945 and β of 0.0509.
AtıfScopus16OpenAlex20İncele - MakaleAçık Erişim2025Scopus SJRQ3Job satisfaction mediation in the relationship between work-family conflict and life satisfaction among Turkish academics
Öztürk, Meral; Türk, Ahmet; Tire, Olcay; Gönültaş, Burak M.
This study examined the mediating role of job satisfaction in explaining the relationship between work-family conflict and life satisfaction among Turkish academicians. Employing a cross-sectional study design 645 academicians aged between 24 and 65 (male = 45.1%, female = 54.9%; professors = 12.1%, associate professors = 17.7%, assistant professors = 28.2%, lecturers = 17.8%, research assistants = 24.2%; mean age and SD = 39.72 ± 8.94) completed the Job Satisfaction Scale, Life Satisfaction Scale, and the Work-Family Conflict Scale. They also self-reported their demographics. The findings from PROCESS MACRO analysis indicated work-family conflict to predict lower job satisfaction among academicians. Those with higher job satisfaction were also self-reported with higher life satisfaction. Lob satisfaction mediated the relationship between the academician’s work family conflict and life satisfaction for higher life satisfaction. The findings of this study indicate a need to implement work-family and life satisfaction measures to enhance job satisfaction among academics.
AtıfScopus1WoS1OpenAlex1İncele - MakaleAçık Erişim2024Scopus SJRQ4MOLECULAR MARKERS ANALYSIS OF ENDEMIC BORNMUELLERA HAUSSKN. SPP. (BRASSICACEAE) IN TÜRKİYE; [ANALIZA MOLEKULARNIH MARKERA ENDEMIČNE VRSTE BORNMUELLERA HAUSSKN. SPP. (BRASSICACEAE) U TURSKOJ]
Okan, Kemalcan; Özkara, Zekiye; Sevİndİk, Emre; Sevİndİk, Mustafa; Paksoy, Mehmet Yavuz
Okan K., Z. Özkara, E. Sevindik, M. Sevindik, M. Y. Paksoy (2024). Molecular markers analysis of endemic Bornmuellera hausskn. spp. (Brassıcaceae) ın Türkiye. - Genetika, Vol 56, No.2, 295-304. In this study, molecular characterisation of Türkiye's endemic species Bornmuellera cappadocica (Willd.) Cullen & T.R. Dudley, Bornmuellera glabrescens (Boiss. & Balansa) Cullen & T.R.Dudley, Bornmuellera kiyakii Aytaç & Aksoy and Bornmuellera angustifolia (Hausskn. ex Bornm.) Cullen & T.R.Dudley was carried out using ten RAPD and ten ISSR primers. In RAPD-PCR analysis, 66 bands were obtained and the polymorphism rate was 96.96%. In the ISSR-PCR analysis, 119 bands were obtained and the polymorphism rate was 95.79%. In the UPGMA (Unweighted Pair Group Method with Arithmatic Mean) dendrogram based on RAPD-PCR, B. angustifolia and B. glabrescens were found to be a sister group, and B. kiyakii and B. cappadocica were a sister group. Principal Component Analysis (PCA) analysis based on RAPD-PCR were compatible with the UPGMA dendrogram. In the UPGMA dendrogram based on ISSR-PCR, B. kiyakii and B. glabrescens were found to be sister groups, and B. cappadocica was closely related to this group. PCA analysis based on ISSR-PCR were compatible with the UPGMA dendrogram. As a result, both RAPD and ISSR results a high rate of polymorphism were obtained. The results were compared with previous sequence-based studies, morphological, anatomical and palynological studies.
- Kitap BölümüYalnız künye2024Kilam as theatre music in Kurdish theatre in Turkey
Çelik, Duygu
This chapter focuses on the use of "kilams" in Kurdish theatre as theatre music. Kilams are the narratives, expressions, and structures of dengbêjî's, which are traditional one-person oral performances of the Kurds. çelik will look at the dramaturgical contributions of the kilams used in the plays she has selected. She will combine methods of performance analysis with the evaluation of play texts, play recordings, field diary entries and notes, as well as (non-standardised) interviews. In this way, the author aims to understand the concept of "theatre music" via an ethnodramaturgical performance analysis. The concept of ethnodramaturgy refers to the analysis of the political/artistic/anthropological identity that people/society creates via performing arts. The main goal of the proposed notion of ethnodramaturgy is to make the theatre of "the other" visible and analyse the ethnocentric monocultural structure in the field of theatre by deconstructing it. Here, the focus will be on Kurdish theatre and dengbêjî. For this purpose, three Kurdish plays in which kilams were used as theatre music will be discussed and their respective functions on stage analysed.
- MakaleYalnız künye2023Scopus SJRQ2Ag seed layer effects on SnO2 thin films for triboelectric devices
Yüzüak, E.; Yüzüak, G. Durak
Materials with triboelectric properties are critical to boosting the efficiency of triboelectric nanogenerators (TENG) by gathering power from waste force and mechanical movement. In this study, we explored tin-oxide (SnO2) thin films with silver (Ag) seed layer properties for friction surfaces at TENGs. Investigation of the triboelectric behavior of semi-conductor/polymer coupling structured TENGs formed by thin films with and without Ag seed layer after heat treatment was explored by X-ray diffraction (XRD), electron microscopy (SEM), atomic force microscopy (AFM), and semi-logarithmic current-voltage measurements. Similar structural characterization studies were carried out in indium tin oxide coated polyethylene terephthalate film (PET/ITO) for the polymer friction layer. Semiconductor/polymer coupling structured TENG efficiency was evaluated in contact-separation mode and the output voltage-current was enhanced to 80 V, 4 μA, and 210 μW of output power calculated by depositing a SnO2 thin film on an Ag seed layer, respectively. Our findings offer a different perspective for synthesizing the semi-conductor/polymer coupling structured TENGs for promising applications in a range of application technologies.
AtıfScopus2WoS2OpenAlex3İncele - Derleme MakaleAçık Erişim2024Scopus SJRQ1Unraveling the ecotoxicological effects of micro and nano-plastics on aquatic organisms and human health
Naz, Saima; Chatha, Ahmad Manan Mustafa; Khan, Nisar Ahmed; Ullah, Qudrat; Zaman, Faisal; Qadeer, Abdul; Khan, Ibrar Muhammad; Danabas, Durali; Kiran, Azka; Skalickova, Sylvie
Plastic pollution ranks among the most severe environmental disasters caused by humans, generating millions of tonnes of waste annually. The extensive and unregulated use of plastics has led to ecotoxicity and environmental imbalance. Microplastics (MPs) are prevalent in aquatic environments, and these MPs further degrade into even smaller particles known as nano-plastics (NPs). Both MPs and NPs impact the environment by readily absorbing organic pollutants and pathogens from their surroundings, owing to their bigger surface area to volume ratio. This review focuses on the source of origin, bioaccumulation, and potential impact of MPs and NPs on aquatic organisms and human health. Additionally, the review explores various methods employed for identification and quantification of these particles in aquatic ecosystems. Sufficient information is available on their characteristics, distributions, and effects on marine ecosystems compared with freshwater ecosystems. For plastic particles <10 μm, more toxicological effects were observed compared with larger size particles, in aquatic life. Understanding the mechanism of action and ecotoxicological effects of micro/nano-plastics on the health of aquatic life across various trophic levels, as well as human health, is of utmost importance. We address knowledge gaps and provide insights into future research approaches for a better understanding of the interactive mechanisms between binary pollutants.
AtıfScopus36OpenAlex38İncele - MakaleAçık Erişim2024Scopus SJRQ3Synthesis process, thermal and electrical behaviors of Ti3C2Tx MXene; [Syntheseprozess, thermisches und elektrisches Verhalten von Ti3C2Tx MXene]
Demirelli, K.; Çelik, A.; Aksoy, Y.; Yegin, M.; Barım, E.; Hanay, Ö.; Hasar, H.
Synthesis of two-dimensional (2D) titanium carbide (Ti3C2Tx), with the name of MXene, by etching Ti3AlC2 (MAX) for different times 20 (v/v) % hydrofluoric acid (HF) at 40 °C was carried out. The influences of time, temperature and source of MAX on the synthesis of MXene were researched. The MXenes produced were characterized by fourier-transform ınfrared (FT-IR) spectroscopy technique, energy dispersive x-ray spectroscopy (EDX), scanning electron microscopy (SEM), x-ray diffraction (XRD) and thermogravimetry (TG) instruments. Above 390 °C, MXene layers were considerably oxidizing and forming anatase and rutile phases of TiO2 under air atmosphere. The resistance of MAX and MXene was 3.6 Ω and 116 Ω, respectively. However, the resistance of the residual part of MXene heated to 620 °C considerably increased to 17850 Ω. This behavior is another important piece of evidence showing that the MXene crystal structure has changed significantly and transformed into a new chemical structure containing anatase and rutil titanium oxide (TiO2). The dielectric loss (ϵ’’) and alternating conductivity (δac) of the MAX and MXenes were determined from their impedance measurements. The ϵ’’ and δac values of MXene were compared with those of MAX. Direct curent conductivities of MAX and MXene produced for 24 h were found to be 0.016 S/cm and 0.0023 S/cm, respectively.
AtıfScopus12OpenAlex11İncele - MakaleYalnız künye2024Scopus SJRQ1Investigation of Sexual Distress in Pregnant Women: A Turkish Multi-center Study
Koç, Emine; Baltacı, Nazlı; Yüksekol, Özlem Doğan; Gürel, Reyyan; Ulucan, Mihriban
Introduction: During pregnancy, sexual distress is common, but its prevalence and underlying factors require elucidation. This study was performed to investigate sexual distress in pregnant women. Methods: This research was designed as a descriptive and multi-center study. The study included 2365 pregnant women from 6 geographical regions of Turkey between April 1, 2022, and February 1, 2023. Data was collected using the “Pregnant Information Form” and “Female Sexual Distress Scale-Revised (FDS-R).” Descriptive statistics, independent sample t-test, analysis of variance, and the Pearson correlation test were used for data analysis. Results: Herein, 46.1% of pregnant women experienced sexual distress, and the mean FDS-R score of the study participants was 14.49. Participants who were dissatisfied with their sexual life before and during pregnancy (p < 0.001), those who did not have sexual intercourse during pregnancy (p < 0.001), those who experienced decreased sexual desire during pregnancy (p < 0.001), those who did not receive sexual education during pregnancy (p < 0.001), and those who experienced problems when engaging in sexual intercourse during pregnancy (p < 0.001) experienced more sexual distress. Sexual distress increased when the mean age and the number of pregnancies and children increased, whereas it decreased when the gestational week increased. Conclusions: Approximately half of the pregnant women included in the study experienced sexual distress. The findings highlight the importance of midwives and nurses encouraging pregnant women to discuss their sexuality. Policy implications: The findings of this study show that sexual distress during pregnancy is common and affected by some factors related to personal and sexual life during pregnancy. This result provides evidence of the need to develop culturally appropriate interventions and policies that include sexual partners in the context of improving pregnant women's sexual distress, sexual health, good family relationships and mental health.
AtıfScopus2WoS2OpenAlex2İncele - MakaleYalnız künye2024Scopus SJRQ2Urban heat island patterns in garden cities: Putrajaya as a case study
Harun, Zambri; Akkurt, Nevzat; Khor, Yu King; Abbas, Ashraf A; Lotfy, Eslam Reda
The garden-city model, characterised by sprawling urban expansion and extensive open spaces, features green and water surfaces alongside substantial road networks, large parking lots and unshaded lands. This diverse landscape contributes to uneven air temperature distribution within the city. Our study investigated urban heat island (UHI) patterns in various urban environments within Putrajaya, focusing on rural, business, residential and near-water areas. Atmospheric data were collected over a year. Putrajaya exhibits two distinct UHI patterns: cool-day-hot-night in residential zones and hot-noon-temperate-elsewhere in impermeable areas. Business areas display alternating patterns based on seasonal climatic conditions and anthropogenic factors. The efficacy of artificial water bodies as a UHI countermeasure in garden cities depends on the size of the water body and the nature of the surrounding land cover. Shaded and green areas exhibit UHI intensities limited to 3°C, while impermeable areas, regardless of proximity to water surfaces, experience UHI up to 6°C. Overall, the garden-city model tends to restrict UHI variations within −1 to 3°C compared to −2 to 4°C in nearby Kuala Lumpur.
AtıfScopus9OpenAlex7İncele - MakaleAçık Erişim2023Scopus SJRQ1Investigation of surface morphology, optical properties and the gamma radiation effect on selenium coated glass substrate containing rare earth oxide
Taşgin, Yahya; Kanca, Muhammed Sait; Kök, Mediha
In this study, in order to add different properties and functions to inorganic amorphous glasses, the applicability and effects of the thin film coating produced by thermal evaporation method were examined by metallographically imaging the effects of 3%–5% CeO2 and Tm2O3 rare earth elements (REE) oxide added to selenium to change the morphology of the glass surface. As a result of the study, it has been proved that CeO 2 and Tm2O3 added to selenium can be coated by thermal evaporation method with AFM images taken from the glass surface and metallographic analyses (SEM, EDX, Mapping). The lowest roughness value was observed in 95Se–5CeO2 coating glass substrate. In all coatings, selenium, which is the main sample, was found to be active, and XRD measurements showed that the thin films were formed by agglomeration on the (101) plane. According to UV-VIS measurements, the lowest optical band energy range was observed in the 95Se–5CeO2 coating.
AtıfScopus11WoS10OpenAlex12İncele - MakaleYalnız künye2024Scopus SJRQ3The RSM-CCD Optimization of Fenton Process for Industrial Wastewater Treatment and Determination of Treatment Efficiency Using Some Biochemical Responses in Dreissena polymorpha
Tanyol, Mehtap; Serdar, Osman; Ketenalp, Zozan; Yildirim, Nuran Cikcikoglu; Erguven, Gokhan Onder; Yildirim, Numan
The study investigated antioxidant biomarkers in Dreissena polymorpha to evaluate the efficiency of Fenton process (FP) in Organized Industrial Zone Wastewater (OIZW) treatment. Antioxidant enzymatic activities, including superoxide dismutase (SOD) and catalase (CAT), glutathione peroxidase (GPX), non-enzymatic antioxidants (GSH) and the indicator of lipid peroxidation (TBARS) were measured in D. polymorpha in response to treated OIZW by FP. The performance of the FP has been optimized with response surface methodology (RSM). The optimum conditions (reaction time, and H2O2 and Fe2+ concentration) for OIZW by the FP process were determined. The results showed that the highest COD removal efficiency (83.94 %) was obtained when as Fe2+ concentration=402.35 mg/L, H2O2 concentration=4100.30 mg/L, and reaction time=10.10 min (desirability=1.000). SOD and CAT enzyme was decreased in the 1/25 diluted OIZW group compared to control group. CAT and SOD enzyme activities were increased after treatment compared to control groups. No statistically significant changes were observed in GSH levels and GPx activities. TBARS levels were increased 1/25 diluted OIZW exposure groups compared to the control group. TBARS levels were decreased after treatment. The results revealed that antioxidant parameters are useful biomarkers for determining the treatment efficiency of the FP.
AtıfScopus2WoS1OpenAlex2İncele - MakaleYalnız künye2024Scopus SJRQ2A Method for Designing Substitution Boxes Based on Chaos with High Nonlinearity
Artuğer, Fırat
Cryptography aims to design algorithms for the protection of important data transmitted over unsecured networks. These algorithms encrypt the data and render it incomprehensible even if it is captured by enemies. Today’s data encryption standard is the AES algorithm. The most important and nonlinear unit in the AES algorithm is the s-box structure. The S-box provides the mixing process in the algorithm, that is, the confusion. An s-box structure with a high nonlinearity value greatly increases the security against various attacks. Therefore, s-box is of vital importance in an encryption algorithm. When we look at the literature, chaos-based s-box structures are frequently used. However, the nonlinearity value of s-boxes produced with chaos is low. In this article, a new, fast, and very simple method is proposed to increase the nonlinearity value of chaos-based s-box structures. In the proposed method, the nonlinearity value is calculated by changing the places of the elements respectively. When the nonlinearity value increases, the s-box is updated, and the next element is passed. In this way, many iterations are not looked at in vain. This saves a lot of time. As a result of the analysis, it has been proven that the s-box structure obtained by the proposed method is cryptographically strong and has a high nonlinearity value. It is thought that the proposed method will provide many advantages for future cryptography applications.
AtıfScopus9WoS7OpenAlex8İncele - MakaleYalnız künye2023Scopus SJRQ2Detection of hateful twitter users with graph convolutional network model
Utku, Anıl; Can, Umit; Aslan, Serpil
Today, hate speech is widespread and persistent in various forms on social networking platforms, targeting different minority groups. These attacks can be carried out using various factors such as racial, religious, gender, and physical disability, etc. Considering the number of people and their interactions, social networks are the most important channels through which these discourses spread. The social network structure is considered a set of nodes and edges and is very suitable for the graph structure. The multidimensional structure of social networks carries social network data from Euclidean space to non-Euclidean space. In non-Euclidean space, the graph structure is used to represent data effectively. In this respect, solving the hate speech problem with graph-based methods in a complex dimensional space can produce more impressive results. In this study, a powerful method based on the Graph Convolutional Network (GCN) model, which is rarely used in this field, was proposed for the detection of hateful Twitter users in social networks. Well-known machine learning methods were used to measure the performance of this method. According to the results obtained, the proposed GCN model gave the most successful result.
AtıfScopus15WoS10OpenAlex16İncele - MakaleAçık Erişim2024Scopus SJRQ2Leptin, Ghrelin, Irisin, Asprosin and Subfatin Changes in Obese Women: Effect of Exercise and Different Nutrition Types
Bengin, Elif; Kırtepe, Abdurrahman; Çınar, Vedat; Akbulut, Taner; Russo, Luca; Aydemir, İsa; Yücedal, Polat; Aydın, Süleyman; Migliaccio, Gian Mario
Background and Objectives: In this study, the effects of a six-week training program and various diets on subfatin, asprosin, irisin, leptin, ghrelin and the lipid profile were investigated in overweight women. Materials and Methods: A total of 78 women voluntarily participated in the study. Groups: The study was divided into eight groups: Healthy Control, Obese Control, Obese + Vegetarian, Obese + Ketogenic, Obese + Intermittent Fasting, Obese + Exercise + Vegetarian, Obese + Exercise + Ketogenic and Obese + Exercise + Intermittent Fasting. While there was no intervention in the healthy and obese control groups, the other groups followed predetermined exercise and diet programs for 6 weeks. Blood samples were taken from the participants in the research group twice (before and after the interventions). An autoanalyzer was used to determine the lipid profile in the blood samples taken, and the ELISA method was used to analyze other parameters. Results: Overall, a significant difference was found in the values of weight, BMI, subfatin, ghrelin, leptin, cholesterol, triglyceride, HDL and LDL as a result of the exercise and diet interventions (p < 0.05). There was no significant difference in asprosin and irisin values (p > 0.05). Conclusions: In conclusion, regular exercise and dietary interventions in obese women can regulate lipid profile, ghrelin, leptin and asprosin levels, and increasing irisin with exercise can activate lipid metabolism and support positive changes in lean mass.
AtıfScopus15OpenAlex14
İncele - MakaleAçık Erişim2024Scopus SJRQ1Effect of White-Portland cement containing micro and nano silica on the mechanical and freeze-thaw properties of self compacting mortars
Etli, Serkan; Yılmaz, Tekin; Hansu, Osman
This study concentrated to investigate the influences of white-Portland cement (W-PC) containing silica fume (SF: micro-silica (µSi) and nano-silica (nSi)) as replacement (2–4 wt%) on mechanical (strength and durability), physical and microstructural behaviors of self-compacting mortars (SCMs) fabricated at 0.48–0.63 w/b ratios. In keeping with these purposes, besides of carrying out the workability (mini-slump flow: M−SF and V-funnel: V-F) experiments of SCMs, the mechanical and microstructural tests implemented were: unconfined compressive strength (UCS), flexural strength (FS), freeze–thaw (F-T) and scanning electron microscope (SEM) analysis. The outcomes displayed that, in comparison with the control, replacing W-PC by SF (particularly nSi) enhanced the UCS and FS, resisted against F-T durability by lowering the strength losses in UCS and FS. The ameliorated microstructure resulting in a reduction in the number and/or a narrowing in the size of micro-cracks and pores contributed to generate a more compact and consolidated SCM structure for the improving of strength and durability due of pore-filling effect and superior pozzolanic characteristics of µSi and especially nSi, this in turn reduced the permeability of SCM, which has a significant effect on the strength and durability behaviors of the SCM.
AtıfScopus16WoS16OpenAlex19İncele - MakaleYalnız künye2024Scopus SJRQ2Phylogenetic analysis of the endemic Bornmuellera Hausskn. spp. (Brassicaceae) in Türkiye based on nuclear ITS and chloroplast trnL intron, trnL-F, rbcL and trnQ-rps16 DNA sequences
Okan, Kemalcan; Sevindik, Emre; Paksoy, Mehmet Yavuz
In this study, phylogenetic analysis of Turkish endemic Bornmuellera (Brassicaceae) species was conducted based on nuclear ribosomal DNA (ITS) and chloroplast DNA (trnL intron, trnL-F, rbcL and trnQ-rps16 DNA) sequences. In addition, the relationships between the sequences of some Brassicaceae family species retrieved from NCBI, and Bornmuellera species were documented. All of the plant specimens were collected from different regions of Türkiye, and brought to the laboratory. Total genomic DNA was extracted using the GeneMark kit. After polymerase chain reaction (PCR) analyses, DNA sequences obtained were then edited using Sequencher 5.4, Bioedit 7.2.3 and FinchTV 1.4.0, and analyzed using MEGA 6.0 software. Maximum likelihood (ML) and bootstrap trees were constructed in order to identify the relationships among Bornmuellera species. In the study, the highest nucleotide diversity was detected by rps16-trnQ (0.039146) sequence analysis, while the lowest was detected by rbcL (0.004186) sequence analysis. In addition, according to the phylogenetic analysis results obtained with other Brassicaceae species, it is revealed that the Turkish endemic Bornmuellera genus is monophyletic.
AtıfScopus5WoS4OpenAlex5İncele - MakaleAçık Erişim2023Scopus SJRQ2Fabrication of hydroxyapatite-based nano-gold and nano-silver-doped bioceramic bone grafts: Enhanced mechanostructure, cell viability, and nuclear abnormality properties
Demirel, M.; Aslan, N.; Aksakal, B.; Arslan, M.E.
In this study, nano-gold (nAu) and nano-silver (nAg) were doped at the molar ratios of Molar5–Molar30 to the Hydroxyapatite (HAp)-based bioceramic bone graft synthesized by the sol–gel method. The effects of nAu and nAg on structural, mechanical, cell viability, and nuclear abnormality of the synthesized bioceramic grafts were evaluated. The chemical and morphological properties of the bone grafts after production were examined through XRD and SEM–EDX analyses and mechanical tests. To determine the biocompatibility of the bone grafts, cell viability tests were performed using human fibroblast cells. In the cytotoxicity analyses, only HAp and HAp-nAu5 grafts did not show toxicological properties at any concentration, while HAp-nAg5 among the nAg-containing grafts gave the best results at the 200–100 μg/mL concentrations and showed significant cytotoxicity in human fibroblast cells. The other nAu-containing grafts showed toxicological properties in the concentration range of 200–50 μg/mL and nAg-containing grafts in the concentration range of 200–100 μg/mL against the negative control. The micronucleus (MN) analyses showed that the lowest total MN and L (lobbed) amounts, while the lowest total N (notched) amount, was obtained from the only HAp graft. It was found that the nAg-doped bone grafts gave higher total MN, L, and N amounts compared to the nAu-doped bone grafts. Furthermore, while the mean nuclear abnormality (NA) values of all grafts gave close results, the highest values were again obtained from the nAg-doped bone grafts.
AtıfScopus7WoS6OpenAlex9İncele
