Sürdürülebilir Kalkınma Amaçları
Yazarlar
- Gul, Muhammet(110)
- Güler, Ömer(70)
- Akkurt, Nevzat(69)
- Serdar, Osman(57)
- Yucesan, Melih(55)
- Celik, Erkan(53)
- Tekin, H.O.(52)
- ALMisned, Ghada(49)
- Bulut, Hasan(49)
- Baskonus, Haci Mehmet(48)
- Paksoy, Mehmet Yavuz(46)
- Yildirim, Numan(45)
- Kocabaş, Mehmet(41)
- Yildirim, Nuran Cikcikoglu(41)
- Zengin, Gokhan(40)
- Alataş, Mevlüt(39)
- Ince, Muharrem(38)
- Benzer, Fulya(37)
- Mete, Suleyman(34)
- Aslan, Naim(33)
- Kutlu, Banu(33)
- Yildirim, Ozal(33)
- Topal, Murat(32)
- Tanyol, Mehtap(30)
- Batan, Nevzat(28)
- Özkul, İskender(28)
- Kök, Mediha(27)
- Utku, Anıl(27)
- Can, Erkan(26)
- Danabas, Durali(26)
- Sulaiman, Tukur Abdulkadir(26)
- Ates, Mehmet(25)
- Ezer, Tülay(25)
- Guler, Omer(25)
- Kutluyer, Filiz(25)
- Say, Yakup(25)
- Serin, Faruk(25)
- Erguven, Gokhan Onder(24)
- Onat, Onur(24)
- Cakilcioglu, Ugur(23)
Yayınlar
- MakaleAçık Erişim2024Evaluating the impact of firm size, firm age, international opportunity recognition, and business network on internationalisation performance
Ataman, Göksel; Platin, Nida
This study examines the cumulative impact of firm size, firm age, business network participation, and international opportunity recognition on the internationalisation performance of small and medium- sized enterprises (SMEs). The study population consists of 160 SMEs in the Kayseri, Inegöl, and Istanbul Organized Furniture Industry area, specifically focusing on those involved in business networks. The data was collected through a survey methodology, and the research objective was assessed using a quantitative approach in SPSS 21. The study aims to examine the gradual impact of variables on internationalisation performance. The stepwise regression in the analysis underscores the crucial impact of firm size and various aspects of international opportunity recognition on internationalisation performance. Notably, the business network's structure positively influences performance, providing optimism for firms seeking to enhance their internationalisation efforts. However, the strength of the tie subdimension of the business network does not impact performance significantly. These findings offer valuable insights for firms aiming to improve their internationalisation efforts.
AtıfOpenAlex1TR Dizin1
İncele - MakaleAçık Erişim2024Digital Game Addiction From The Perspective of Children Aged 10-14 Years: A Phenomenological Research
Kurşun, Engin; Turgut, Yiğit Emrah; Aslan, Alper; Yaşar, Selva Karaman
The purpose of this study is to reveal the digital game addiction from children’s perspective between the ages of 10 and 14 and how they are affected by digital games. In this context, the phenomenology pattern was adopted. Criterion sampling which is one of the purposeful sampling methods was chosen in the selection of participants. Data collected via individual interviews with 24 children who are included in the sampling were analyzed by using content analysis techniques. Findings showed that the majority of children liken digital game addiction to substance addiction. Children explained that digital games caused addiction because of the several factors such as completing mission, winning the game, passing to the next level and entertaining. It was concluded that digital games affect children academically, socially, physically and psychologically. Besides, while addicted children mostly expressed the effects of “increasing in tendency to violence”, non-addicted children also stated the effects of “entertainment”. It was determined that social isolation and the disruption of family relationships become prominent in the effects of digital games on children’s social life. Furthermore, children stated that digital games cause skeletal and muscular system disorders and weight gain as well as children mostly mentioned eye diseases among the physical effects of digital games.
AtıfOpenAlex3İncele - MakaleAçık Erişim2024Cross-dressing in contemporary british feminist theatre
Şentürk, Gamze
Sex and gender are two concepts that are often unconsciously used interchangeably, but they have distinct meanings. They are crucial in understanding the gender hierarchy or the distinction between man and woman created by the patriarchal order. While sex refers to a biological difference or an innate existence based on signs such as chromosomes and genitals, gender is a socio-cultural identity subsequently acquired through social interaction. While the biology-oriented approach reduces femininity and masculinity to the body based on an essentialist approach, the socio-culturally oriented approach underlines that femininity and masculinity are culturally constructed, fluid, and changeable. The gender roles assigned to man and woman in patriarchal society bring along certain expectations based on their sexes and their society’s values and beliefs about gender. The fact that both woman and man are expected to wear appropriate dress for their gender roles is the reflection of this expectation. When a man wears clothing traditionally associated with women or when a woman wears clothing traditionally associated with men, they might face ridicule or criticism because these clothing choices challenge established gender norms, and because the clothes are reminders of roles or symbols that favour social roles. Contrary to this, cross-dressing is described as an act of wearing clothes and accessories that belong to the opposite sex, and it is possible to see its examples as a deconstructive strategy in contemporary British feminist theatre. This article aims at discussing the functions of cross-dressing as a body memory in contemporary British feminist theatre over selected plays such as Caryl Churchill’s plays Cloud Nine (1979) and Top Girls (1982), Timberlake Wertenbaker’s New Anatomies (1984), and Moira Buffini’s Silence (1999).
AtıfOpenAlex2TR Dizin2İncele - MakaleYalnız künye2024Forced To Become Entrepreneurs: Investigating the Impact of Workplace Bullying on the Entrepreneurial Intentions of Immigrant Workers in Turkey
Uyan, Umut
Purpose: The issue of migrant workers has been frequently addressed in management and organiza- tion studies, as in many other fields since migration has become a global phenomenon. By referring to the push-pull theory of entrepreneurship, the current study aims to understand to what extent the bullying behavior that migrant workers are exposed to in the workplace encourages them to engage in entrepreneurship. The main assumption that constitutes the hypotheses is that negative workplace experiences push migrant workers to create alternatives against undesirable working conditions. Methodology: A quantitative research design was employed, involving standardized questionnaires to gather data from 231 migrant workers employed in Turkey’s textile sector. The hypotheses were tested using the AMOS statistical program. Findings: The findings support the bullying behavior that migrant workers are exposed to in their workplaces pushes them to become entrepreneurs (β= 0.36, p<.001). Further, the findings indicate that individual entrepreneurship orientation (IndEO) does not moderate the relationship mentioned (β = 0.03, p= .33). Originality: Unlike mainstream entrepreneurship literature, this study demonstrated that entrepre- neurship can be an ‘imperative’ stemming from unfavorable working conditions of migrant workers, rather than an ‘attractive’ phenomenon. Yet, the success and sustainability of such entrepreneurial activities is debatable. The study is expected to provide a clearer picture of migrant entrepreneurial initiatives and, therefore, guide policymakers in developing effective strategies to support economies.
- MakaleAçık Erişim2024An Evaluation of the logistics Performance Index Using the ENTROPY-based ORESTE Method
Mete, Süleyman; Özdemir, Ümit; Çıray, Deniz
Logistics performance measurement has become increasingly important for countries as the competitive environment has increased. For this purpose, the World Bank has begun publishing logistics performance index (LPI) reports. The LPI ranking of countries is determined by the experts’ scoring system. By re-analyzing this scoring and reevaluating it without the need for expert opinion, this study analyzed the evaluation of country rankings according to criteria weights from several different angles. This study aims to provide a detailed analysis of the World Bank’s 2023 report using the ENTROPY-based ORESTE method, which has not previously been used in LPI evaluation and provides a more accurate and robust approach to the research. Although several studies have explored this similar topic in the literature, using a new method and comparing the criteria weights by including them in the analysis gave the present study a broader perspective. LPI analysis is an important tool for assessing and improving a country’s competitiveness, and it can help investors compare logistics infrastructure and processes across countries. This can help stakeholders to better plan and make direct investments. Logistics researchers can use the LPI to examine sectoral and economic trends and forecast future developments. Furthermore, the LPI can be used in academia to train and raise awareness about assessment, logistics, and supply chain management programs. This is an important resource for training future logistics professionals and managers and providing policymakers and practitioners with a more refined tool for identifying areas for improvement and investment in logistics infrastructure.
AtıfTR Dizin3İncele - MakaleAçık Erişim2024Determination of glass ceiling barriers in Academicians
Aslan, Sinan; Yeşiltepe, Akgün; Ozturk, Aygul
Aim: This study was planned to determine the perceptions of academicians working at universities in Turkey about artificial barriers that prevent women from rising to upper levels of management. Materials and Methods: This descriptive study was carried out by reaching 394 academicians who are actively working in the Academy and who agreed to participate in the study between February 16 and March 15, 2022, via online survey method. Results: While a difference was found between perceived glass ceiling barriers of academicians who participated in the study and their age, gender, marital status, status of having children, educational status and academic title (p<0.05); no difference was found between perceived glass ceiling barriers and income status, working years, number of boards academicians were in, the state of choosing the profession willingly and the state of being satisfied with the profession (p>0.05). Mean score of Glass Ceiling Barriers Scale for Academicians used in this study was found as 74.30±18.93 and it was found that academicians had moderate level of perceptions about artificial barriers preventing women from rising to upper levels of management. Conclusion: The research clearly reveals the thoughts of both men and women on gender equality and provides guiding data for academics.
AtıfOpenAlex3İncele - MakaleAçık Erişim2024Investigation of tool wear and thrust force in drilling aisi 316 austenitic stainless steel using electrophoresis method
Mahmat, Aybars
Cutting tool costs are an important component of machining. For this reason, improving machining methods in machining affects the life of the cutting tool. Recently, various machining methods have been used to extend tool life by reducing cutting tool wear. One of these methods is electrophoresis-assisted processing. Electrophoresis-assisted machining is a non-traditional machining method created by the impact of abrasive nanoparticles on the machining area with the help of the generated electric field. Electrophoresis-assisted machining increases the machinability of difficult-to-machine materials with high strength and hardness properties compared to traditional machining methods. In this study, the impacts of various cutting parameters on the drilling performance of AISI 316 L stainless steel material were searched using electrophoresis-assisted drilling (EAD) and conventional drilling (CD) methods. In the study, SiC powder was used as nanoparticles in the solution obtained to create the electric field. Within the scope of the experiments, the effects of different machining methods, cutting speeds and feed rates on thrust forces and cutting tool wear values were experimentally examined. As a result of the investigations, the cutting tool wear and thrust cutting force obtained with EAD are better than CM. Increasing feed rate and cutting speed increased cutting tool wear in both machining methods. It has been determined that the thrust force decreases as the cutting speed increases, while it increases as the feed rate increases.Keywords: Electrophoresis, drilling, cutting force, tool wear, AISI 316
- MakaleAçık Erişim2024Experimental Investigation of Rejuvenated Asphalt Mixtures Using Bio-Oils from Different Biomass Sources
Altundoğan, Hamdi Soner; Furtana, Beyza; Yılmaz, Mehmet
Asphalt mixes containing Recycled Asphalt Pavement (RAP) materials are generally harder than traditional mixes. Different rejuvenators are used to soften recycled asphalt pavement by reducing this hardness. In this study, recycled asphalt pavement was added to bituminous hot mixtures at 3 different rates (25%, 50% and 75%). To rejuvenate bituminous hot mixtures containing RAP, three different rejuvenators (pine cone, olive pomace and wheat straw) were added to the mixtures. This study investigated the effect of asphalt mixtures containing RAP and rejuvenator on the mechanical properties. Marshall test and moisture damage test were performed to examine the mechanical properties of asphalt mixture samples. As the bio-oil content in asphalt mixtures increases, the stability values of the mixtures decrease. As the bio-oil ratio in asphalt mixtures increases, tensile strength (TS) values decrease in both unconditioned and conditioned mixtures. While the increase in bio-oil reduces the tensile strength ratio, the shrinkage ratio of mixtures prepared with RAP increases. The bio-oil derived from pomace has been identified as the most effective rejuvenator among those tested.
AtıfOpenAlex1TR Dizin1İncele - MakaleAçık Erişim2024Ebelik Öğrencilerinin Evliliğe Yönelik Tutumları ve Doğum Korkuları Arasındaki İlişki
Aksoy Derya, Yeşim; Benli, Tuba Enise; Yetişmiş, Habibe Yaşar
Amaç: Bu araştırma ebelik öğrencilerinin evliliğe yönelik tutumları ve doğum korkuları arasındaki ilişkinin belirlenmesi amacıyla yapılmıştır. Yöntem: Kesitsel ve ilişki arayıcı tipte olan bu araştırma Türkiye’nin doğusunda bulunan iki üniversitenin Sağlık Bilimleri Fakültesi Ebelik Bölümü öğrencileri ile yürütülmüştür. Araştırmada örneklem hesabına gidilmeyip her iki üniversitede öğrenim gören tüm ebelik öğrencilerine ulaşılmaya çalışılmıştır. Gönüllülük esasına dayanarak araştırmaya katılan 372 ebelik öğrencisi ile çalışma tamamlanmıştır. Araştırmanın verileri “Kişisel Bilgi Formu”, “İnönü Evlilik Tutum Ölçeği (İETÖ)” ve “Kadın Gebelik Öncesi Doğum Korkusu Ölçeği (KGÖ-DKÖ)” ile toplanmıştır. Verilerin değerlendirmesinde SPSS (25.0) istatistik paket programında sayı, yüzde dağılımları, ortalama, standart sapma, Independent t-test, One-Way Anova, Tukey ve korelasyon testleri kullanılmıştır. Bulgular: Öğrencilerin yaş ortalaması 20,71±1,55’tir. Öğrencilerin %80,1’i çekirdek aile yapısına sahip, %54,3’ü il merkezinde yaşamakta, %96.8’i çalışmamakta ve %56.7’sinin geliri giderine eşittir. Öğrencilerin İET ve KGÖ-DKÖ’den aldıkları toplam puan ortalamaları sırasıyla; 69.73±20.01 ve 36.37±12.00’dır. Öğrencilerin evliliğe yönelik tutumları ve doğum korkuları arasında negatif yönde istatistiksel olarak anlamlı bir ilişki bulunmuştur (p<0,001). Sonuç: Bu araştırmada öğrencilerin gebelik öncesi doğum korkuları arttıkça evliliğe yönelik tutumlarının azaldığı saptandı. Bu sonuç doğrultusunda öğrencilerin gebelik öncesi doğum korkuları dikkate alınarak gelecekteki evlilik düşüncelerinin desteklenmesi önerilmektedir.
AtıfOpenAlex1İncele - MakaleAçık Erişim2024Comparison of Characteristics and Antimicrobial Activity of Synthesized Zinc Oxide And Magnetite Iron Oxide Nanoparticles Using Four Different Plant Extracts
Aytar, Mehmet; Aydogdu, Burcu; Unal, Ilkay
The aim of this study was to synthesize Zinc oxide (ZnO) and magnetite ıron oxide (Fe3O4) nanoparticles utilizing a precipitation method, employing plant extracts from Ocimum basilica(1), Cinnamomum zeylanicum(2), Lactarius salmonicolor(3) and Paeonia kesrouanensis(4) as reduction and stabilizing agents. Additionally, the antimicrobial activity of these nanoparticles against both gram-positive (S. aureus, ATCC 25923) and gram-negative (E. coli, ATCC 25922; P. aeroginosa, PAO1), bacteria as well as fungus (C. albicans 90028) was evaluated. The nanoparticles (NPs) were characterised by various analyses, including TEM, SEM, XRD, FTIR, DSL, and zeta potential. Based on the TEM image, the ZnONPs exhibited a cluster of flower-like structures, whereas the Fe3O4NPs displayed a spherical shape with a varying size distribution. The zeta potential values for ZnO NPs ranged from -5.35 to -16.9, while for Fe3O4NPs ranged from -7.43 to -20.7. All ZnO nanoparticles exhibited antimicrobial activity exclusively against the S. aureus strain, whereas Fe3O4NPs did not demonstrate any antibacterial effect.
AtıfOpenAlex4TR Dizin1İncele - MakaleAçık Erişim2024The Relationship between Sleep Quality and Smartphone Addiction among Adolescents
Arıkan, Duygu; Kurudirek, Fatma; Gürarslan Baş, Nazan
Introduction: Technological developments have increased the usage of mobile equipment. Using a smartphone became a part of life and accentuated its usage day after day especially in adolescent groups. Aim: The study was aimed to examine the relationship between sleep quality and smartphone addiction of adolescents. Method: This cross-sectional study was carried out with 1192 high school students between March and June 2019. Data were collected with the Personal Information Form, Pittsburg Sleep Quality Index, Smartphone Addiction Scale. The data were evaluated through percentile distributions, means, independent samples t-test, Kruskal-Wallis test, ANOVA, and Pearson correlation analyses. Results: The mean age of adolescents was determined to be 15.79 ± 0.96, with the mean total score of the Pittsburg Sleep Quality Index was 6.05 ± 3.04 and the Smartphone Addiction Scale was 36.01 ± 10.82. Statistically significant differences were observed among adolescents concerning gender, grade, daily smartphone usage duration, internet accessibility, and the use of smartphones before bedtime, impacting both sleep quality and smartphone addiction (p < 0.05). A positive and meaningful correlation was found between sleep quality and smartphone addiction in adolescents (p < 0.05). Conclusion: As the smartphone addiction increases, sleep quality decreases. Adequate sleep is crucial during the growth spurt period. It is evaluated that early diagnosis and prevention of smartphone addiction in adolescents could make a significant contribution to the protection and promotion of adolescent health.
AtıfOpenAlex3TR Dizin1İncele - MakaleAçık Erişim2024Effects of Porosity and Boron Reinforcement in AISI 316L Stainless Steel for Biomedical Applications
Aslan, Naim; Aksakal, Bunyamin; Fidan, Ferzan
AISI 316L stainless steel (SS) is one of the most widely used biomaterials in the manufacture of implants and biomaterials. It has advantages over equivalent biomaterials such as low cost, good mechanical properties and biocompatibility. The pores found in porous biomaterials provide mechanical interlock, ensuring strong attachment of the implant to the tissue. In this study, 20%, 30% and 40% by volume of polyvinyl alcohol (PVA) and Boron powder were added into 316L powder to obtain porous SS implant. To investigate the effect of porosity and boron effect on the stainless-steel implant material, the samples produced in PVA and Boron added groups, were sintered at 1180 oC under an argon atmosphere. With the evaporation of PVA in the structure, porous and boron added samples were obtained in two groups. Finally, the samples were subjected to Brinell hardness and compression tests and analyzed by SEM, EDS and XRD. As a result of the hardness tests, the highest values were measured as 37.006, 31.32, 25.28 HB. 39.5, 34.5, 26.2 MPa strengths were measured for 20%, 30% and 40% porous samples respectively.
AtıfOpenAlex1İncele - MakaleAçık Erişim2024Effect of Ground Diatomite on Early Strength of Self-Compacting Mortars
Karabulut, Büşra; Yon, Merve Sahin; Karataş, Mehmet
Portland cement fabrication is a significant factor that increases the amount of carbon dioxide released into nature. For this reason, it is very important to use natural and waste materials with pozzolanic properties instead of portland cement. In this article, the usability of diatomite rock, a natural pozzolanic material that can be substituted with portland cement, in the manufacture of self-compacting mortar was studied. In the experimental study, prismatic specimens with dimensions of 40 × 40 × 160 mm were used to examine the impact of ground diatomite on the early age mechanical properties of self-compacting mortar; it was produced by replacing 0%, 5%, 10%, 15%, 20% of diatomite with portland cement, respectively. The slump-flow test to obtain self-compacting mortar was conducted according to the European Federation of Specialized Construction Chemicals and Concrete Systems guidance. Specimens prepared using 0%, 5%, 10%, 15% and 20% diatomite were cured in water at 23±2 ̊C temperature for 3 days. 3-day (early age) flexural and compressive strength worths were gained for the samples whose curing period was completed. As a result of this experimental study, it was specified that the highest strengths were in the series containing 5% diatomite, exceeding the reference samples. Additionally, it has been determined that mechanical strength decreases when the diatomite ratio in mixtures is more than 5%.
AtıfOpenAlex1İncele - MakaleAçık Erişim2024Investigation of Flower, Leaf, and Stem Parts of Three Gundelia Species Growth in the Eastern Anatolia Region of Türkiye from a Biochemical Perspective
Yilmaz, Fatih; Türkoglu, Ismail; Kirmizikaya Özmen, Gorkem; Yüce Babacan, Ebru; Yilmaz, Okkes
13 species of Gundelia species plants are endemic in T & uuml;rkiye and are frequently used by the public for both nutrition and medicinal objectives. In this study, three parts (flower, leaf, and stem) of three species of Gundelia ( G.dersim , G.glabra, and G.munzurensis) were biochemically investigated. DPPH and ABTS analyses for antioxidant activity were performed on methanol extracts of plant parts. As a result of both analyses in parallel, the flower part of G.munzurensis had the highest %Inhibition value (DPPH:91.85 +/- 0.78; ABTS:97.38 +/- 0) (P<0.001). In total phenolic (29.09 mg GAE/g) and total flavonoid (5.59 mg CE/g) measurements, the highest amount was found statistically quite significant (P<0.001) in the leaf part of G.munzurensis. Gallic, vanillic, ferulic, romantic, and cinnamic acids, which are phenolic acids and of the flavonoids, rutin, catechin, naringin, and naringenin, were determined in all plant parts. Vitamin D3, alpha-tocopherol, ergosterol, stigmasterol, and beta-sterol were detected in parts of all plant species. While palmitic (16:0), palmitoleic (16:1), stearic (18:0), oleic (18:1), linoleic (18:2), and linolenic (18:3) fatty acids as the main fatty acids were detected in all parts of the three Gundelia species, lauric (12:0), tridecanoic (13:0), myristic (14:0), pentadecanoic (15:0), cis-10-pentadecanoic (15:1), heptadecanoic (17:0), cis-10heptadecanoic (17:1), and eicosanoid (21:0) acids were also identified at different concentrations. Considering the biochemical properties of Gundelia species, it shows that they can be consumed as food and also used pharmacologically.
AtıfOpenAlex1
İncele - MakaleYalnız künye2024IS SCHOOL AUTONOMY EFFECTIVE FOR SUSTAINABLE ACADEMIC ACHIEVEMENT? PISA EXAM SAMPLE
Çankaya, Ibrahim; Balikçi, Servet
This study compares whether there is a significant difference between the PISA averages of countries with strong school autonomy and countries with weak school autonomy. The study is a mixed research method study. The study group was selected from OECD countries with strong and weak school autonomy using a counter-sampling technique. The five OECD countries with the strongest school autonomy are Finland, Netherlands, Czech Republic, UK and Estonia. The five OECD countries with the weakest school autonomy are France, Spain, Greece, Turkey and Mexico. In all PISA exams between 2006 and 2022, there is a significant difference (p<.05) between countries with strong school autonomy and countries with weak school autonomy in the mean scores of math, science and reading. In countries with strong school autonomy, the levels of school self-determination and parental involvement in lifelong learning activities are higher than the OECD average. Countries with weak school autonomy, this rates are below the OECD average. In countries with strong school autonomy, teacher-administration collaboration, teamwork in school, student monitoring, and teacher participation in professional development activities are mandated by school management or required by law.
- MakaleAçık Erişim2024Volatility Modeling and Spillover: The Turkish and Russian Stock Markets
Gençyürek, Ahmet Galip
This study investigates the internal and external (spillover) characteristics of the volatility of the Turkish and Russian stock market indices. To this end, generalized autoregressive conditional heteroskedasticity models that are classified as short memory (GARCH, EGARCH, GJR-GARCH, APARCH) and long memory (FIGARCH, FIEGARCH, FIAPARCH, HYGARCH) considering adaptive structure (Fourier series), and the rolling Hong causality methods are used. The analysis spans the years 2003-2020, revealing that the asymmetric power autoregressive conditional heteroskedasticity model is the most appropriate method in terms of both stock indices and leverage and long memory effects are evident in the volatility series. Bidirectional volatility spillovers between Turkish and Russian stock market indices are also evident in all time horizons. Investors can use volatility results for stock valuation, risk management, portfolio diversification, and hedging, and policymakers can consider the volatility results to evaluate the fragility of financial markets.
AtıfOpenAlex2TR Dizin2İncele - MakaleAçık Erişim2024Scopus SJRQ2Seed content and its oil composition in walnut cultivated from Tunceli, Türkiye
Aydin, Caglar Mert; Güven, Alper
The study is intended to shed light on walnut species cultivated in Tunceli province in 2022 and the oils produced from Juglans regia Fernor walnuts. Physicochemical properties of walnuts and fatty acid composition of the oils produced from the walnuts were identified. In addition, nutritional indexes and bioactive compounds of the oils were determined.Overall, physicochemical properties of the seeds belonging to walnuts significantly changed according to the variety. The major component in walnut seeds was found to be oil content. Saturated (SFA), monounsaturated (MUFA) and polyunsaturated (PUFA) fatty acid ratios of the walnuts were varied according to the type of seed. Characterization of fatty acid composition in the oils from the walnuts was performed according to 6 different fatty acid levels. These fatty acids are myristic, palmitic, margaric, oleic, linoleic and linolenic acid. The oils have a refractive index being in the range of 1.4677-1.4694, the iodine value being in the range of 107-109 gms. TPC (total phenolic content) and DPPH antioxidant activity of the oils significantly changed according to the variety. TPC of the oils were found in the range of 0.33-1.53 mg GAE/g oil and DPPH antioxidant activity of the oils were in the range of 13.04-5.42 mg TE g(-1) oil. All walnut oils showed Newtonian flow behavior. The nutritional indexes including UI (Unsaturation index), IA (Atherogenicity index), IT (Thrombogenicity index) and HH (Hypocholesterolemic/hypercholesterolemic ratio) were determined to significantly change according to the variety, except for IT. It could be stated from the results that Nazimiye walnut seed oil has healthier effects on human health.
AtıfOpenAlex3İncele - MakaleYalnız künye2024Scopus SJRQ3Biosynthesis of silver nanoparticles using the aqueous extract of Rheum ribes, characterization and the evaluation of its toxicity on HUVECs and Artemia salina
Unal, Ilkay; Egri, Sinan
This study describes an eco-friendly procedure to synthesize silver nanoparticles (AgNPs) using fresh and dried stem extract of Rheum ribes. AgNPs formation was confirmed using UV-vis spectrometry. The effects of parameters such as temperature, reaction time, pH, AgNO3 concentration, and plant extract/AgNO3 ratio on NP formation were evaluated. Morphology and structural features of the particles were characterized using SEM, TEM, XRD, and FTIR. The average size, polydispersity index, and zeta potential were determined using DLS. After characterization, among the two AgNP samples, selected one; AgNP sample synthesized by dried Rheum ribes stem extracts (d-AgNPs), which exhibited narrow size distribution and high surface plasmon resonance in the range of 435-445 nm for toxicity assessment. The cytotoxic effect of d-AgNPs on HUVECs cells was evaluated with MTT analysis. Accumulation measurements were made in three periods as 24, 48, and 72 h and elimination values were examined at +24 h using ICP-MS analysis
AtıfWoS6OpenAlex6İncele - MakaleAçık Erişim2024ASSESSMENT OF URBAN FLOOD RISKS OF THE CITIES USING ENTROPY-VIKOR METHODS IN TURKIYE
Derse, Onur; Polat, Elifcan Gocmen
In recent years, there is growing interest for evaluation of urban flood risks of cities over the past decade due to rapid urbanization and climate change. The optimal flood risk assessment is strategically achieved not only with classical risk modelling approaches but also with holistic and comprehensive framework. This paper focuses on a detailed flood assessment providing risk database for policymakers and urban planners to decide the flood prone areas in Turkey. In this context, the Entropy based VIKOR (VIseKriterijumska Optimizacija Kompromisno Resenje) was provided to evaluate a range of flood risk criteria named number of floods, population density and number of buildings, flood protection area which are under the concept of risk dimension including hazard, exposure and vulnerability aspects. Computational results demonstrate that the provinces of & Scedil;anl & imath;urfa, Ordu, Zonguldak and Van are assigned with higher urban risk values, respectively and the ranking of the cities was presented with different q values. The findings should support practitioners and researchers for land use planning and risk reduction works as the detailed flood risk evaluation was presented in terms of the flood management.
AtıfWoS4OpenAlex5İncele - MakaleAçık Erişim2024Anti-inflammatory activity of a novel lectin isolated from Pleurotus eryngii var. ferulae mushroom
Seliman, Thoiba Mogahid Hussein; Ülbegi, Gulsum Altiparmak; Ozsoy, Nurten; Kavlo, Hevidar Alp; Sagirli, Pinar Aksoy
Background and Aims: Pleurotus species are edible mushrooms with important economic and medicinal value. Many pharmacological properties of these species, such as anticancer, immunomodulating, and anti-inflammatory activities, have been attributed to lectin. The aim of this study was to purify a novel lectin from Pleurotus eryngii var. ferulae (PEFL) and investigate its anti-inflammatory activity. Methods: PEFL was purified by 80% ammonium sulphate fractionation, diethylaminoethyl (DEAE)-Sepharose-4B anion exchange, and Sephadex G-100 gel filtration chromatography. The molar mass of the purified lectin was determined by sodium dodecyl sulphate-polyacrylamide gel electrophoresis (SDS-PAGE) under denaturing conditions. Inhibition of lectin-induced haemagglutination by several carbohydrates and one glycoprotein (ovalbumin) was also performed using the haemagglutination inhibition activity test. The anti-inflammatory effect of PEFL was tested in a lipopolysaccharide (LPS)-induced inflammation model in mouse macrophage cells (RAW 264.7). The levels of prostaglandin (PG)-E2, tumour necrosis factor-alpha (TNF-alpha), interleukin1-beta (IL-1 beta), interleukin-6 (IL-6), interleukin-10 (IL-10), and interferon-gamma (IFN-gamma) were determined using enzyme-linked immunosorbent assay (ELISA) kits. Furthermore, the expression of nitric oxide synthase (iNOS) and cyclooxygenase-2 (COX-2) was estimated by western blot analysis. Results: PEFL was obtained in 16% yield. The specific activity of PEFL was calculated as 1280 haemagglutinating units (HU)/mg protein and was inhibited only by D-galactose. The molecular weight was determined to be 46 kDa. PEFL showed an anti-inflammatory effect by reducing the production of pro-inflammatory PGs through COX-2 inhibition, as well as reducing iNOS expression. Furthermore, our findings reported that PEFL has a protective effect on inflammation by decreasing the production of pro-inflammatory cytokines and increasing the production of the anti-inflammatory cytokine (IL-10). Conclusion: The results suggest that PEFL can be considered as a potential therapeutic agent in the development of new therapeutic strategies for inflammatory diseases.
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