Sürdürülebilir Kalkınma Amaçları
Yazarlar
- Dertli, Enes(12)
- Şahin, Engin(9)
- Bayram, Sinan(8)
- Dirican, Ebubekir(8)
- Ertugrul, Mehmet(8)
- Kaya, Yunus(8)
- Sefali, Abdurrahman(8)
- Kul, Sinan(7)
- İspirli, Hümeyra(7)
- Ayata, Ümit(6)
- Kutlu, Naciye(6)
- Gerçek, Yusuf Can(5)
- Kömür, Gökhan(5)
- Ramahi, Omar M.(5)
- Çelik, Saffet(5)
- Özdemir, Akın(5)
- Artar, Musa(4)
- Ayazoglu, Rabil(4)
- Can, Zehra(4)
- Ecem Bayram, Nesrin(4)
- Ekmekyapar Torun, Fatma(4)
- Hasar, Ugur C.(4)
- Hasar, Ugur Cem(4)
- Kamiloğlu, Aybike(4)
- Karaali, Rabi(4)
- Keskin, Savaş(4)
- Ozden, Erdemalp(4)
- Sunaoglu, Serife Kazanci(4)
- Taylan, Osman(4)
- Ustabulut, Mete Yusuf(4)
- Akkoyunlu, Ebubekir(3)
- Apak, Ömer Ceyhun(3)
- Aras, Selim(3)
- Battal, Fetullah(3)
- Carbas, Serdar(3)
- Cebeci, Fatma(3)
- Gökçe, H.S.(3)
- Hırca, Tuğçe(3)
- Izginli, Mucahit(3)
- Kadakal, Huriye(3)
Yayınlar
- MakaleAçık Erişim2022Scopus SJRQ3Design of an efficient vehicle-actuated signal control logic for signalized intersections
Cakici, Ziya; Murat, Yetis Sazi; Aydin, Metin Mutlu
The effectiveness of fixed-time management systems dramatically decreases in case of fluctuating traffic demands in signalized intersection approaches. The result is the utter waste of time in traffic to be followed by material, psychological, and ecological problems. In recent years, to minimize the negative impacts of these problems, many researchers have focused on Intelligent Transportation Systems (ITS). As it is known, one of the applications of ITS is called vehicle-actuated (traffic-actuated) management systems. Because the success of these types of applications is directly related to the created control logic, the selection of the most proper control parameters for the created control logic is an important issue. This study aims to create an effective control logic and flow chart for the vehicle-actuated management system. At the end of the analyses, it is seen that the created vehicle-actuated management system can adapt to fluctuations in traffic demands in signalized intersection approaches. Average vehicle delays, fuel consumptions, and exhaust emissions can be reduced significantly by the created system. In case of fluctuations in traffic demands in intersection approaches, it is concluded that the performance of the intersection may increase enormously because of the created vehicle-actuated management system.
AtıfScopus4WoS6OpenAlex7
İncele - MakaleAçık Erişim2022Scopus SJRQ3Performance Analysis of Buck-Boost and SEPIC Converter for Commutation Torque Ripple Minimization in BLDC Motors
Çorapsız, Muhammed Reşit; Kahveci, Hakan
This paper discusses comparative analysis of Buck-Boost and SEPIC (Single Ended Primary Inductance) converters used in DC link voltage control technique to reduce torque ripple in Brushless Direct Current Motors (BLDCM). The aim of this study is to prove the efficiency of the aforementioned two converters, which have been adopted in many studies to reduce torque ripples caused by commutation, on the same motor parameters. Although BLDCM has many advantages, ripples in the generated torque have limited the use of these motors in applications requiring precise speed and torque. In this study, BLDCM was analyzed exhaustive mathematically and electrically and the problem that caused commutation torque ripples was explained in detail. The DC link voltage control has been proposed to suppressing torque ripples in the BLDCM. In addition, the link voltages required for reducing the torque ripples were obtained separately via both the Buck-Boost and the SEPIC converters. These converter topologies are examined under certain speed and torque conditions and the results were compared. When the results are evaluated together, it was observed that both converters performed the very closely performance each other. However, the Buck-Boost converter produced the desired voltage levels with less oscillation than the SEPIC converter.
AtıfScopus5WoS2OpenAlex3İncele - MakaleYalnız künye2022Scopus SJRQ3Designing learner control in instructional software: a lens of 'time spent on tasks' to determine the mental effort
Çakiroǧlu, Ünal; Aksoy, Dilara Arzugül; Gencan, Ayşegül; Şen, Hasan
This study aims to determine the relationships between mental effort and the use of learner controls while working with instructional software. Various versions of instructional software including control components were developed to examine this relationship. Twenty-four secondary school students participated in the study and studied with instructional software including different controls in the content pages. All content pages consisted of the content area, image area, and control panel components. Five different page templates including different positions of these components were placed on the pages. Quantitative data were gathered from the cognitive load scale and the time spent on tasks was used for measuring the mental effort spent on the tasks in the software. The results indicated that students who used more controls spent more mental effort. Along with the study findings, the factors affecting the perceptions of cognitive load regarding the time spent on the controls were discussed. Implications were suggested for designers within the cognitive effects of learner control.
- MakaleAçık Erişim2022Scopus SJRQ3Exergy analyses of two and three stage cryogenic cycles
Atasbak, Musa; Keven, Arzu; Karaali, Rabi
Cryogenics has an important influence on industry and science. In this study, optimum working conditions are obtained by applying exergy analysis and local optimization methods to two- and three-stage vapor compression cascade cryogenic cycle. The first and second laws of thermodynamics, exergy analysis, and local optimization methods are applied to the two- and three-stage cascade cryogenic cycle. By considering the needs and demands, it is possible to create new cycles by adding new devices and/or new stages to these cycles. The results of the optimum operating conditions are obtained for the two- and three-stage vapor compression cascade cryogenic cycle. It is seen that to achieve high COP values and high efficiency; it is necessary to reduce the compression ratio of the compressor as much as the fluid allows. For the two-stage cycle, the minimum total work required for cryogenic cooling is around P 7 = 2,400 kPa. The COP value is 0.30 between P 7 = 2,400 and 2,800 kPa, and the maximum exergy efficiency is obtained around 0.235. It is seen operating the first-stage compressor at high pressures increases the total losses of the entire cycle from 7,500 to 18,550 kW. The increase in total exergy losses is around 247%, and operating the first-stage compressor at high pressures increases the exergy efficiency of the entire cycle. The increase in total exergy efficiency is around 160%. When the second-stage compressor is operated at low pressure, the COP value increases by 2%, the exergy efficiency increases by 20%, and the exergy losses decrease by around 40%.
AtıfScopus6WoS3OpenAlex9İncele - MakaleAçık Erişim2022Scopus SJRQ2Probiotic ice cream with Malus floribunda fruit sauce: Quality properties, mineral, and volatile composition
Arslaner, Ayla; Salik, Mehmet Ali
This study investigated the effect of Malus floribunda fruit sauce (MFS) on the quality properties, minerals, volatiles, and viability of Lactobacillus acidophilus La-5® in probiotic ice creams. The MFS increased the dry matter, acidity, total sugar, invert sugar, and calories while decreasing fat, protein, ash, sucrose contents, viscosity, overrun, first dripping, complete melting time, and the pH of samples. The heavy metal contents were within safe limits. The MFS increased the perception of a fruity taste/aroma due to the increase in the terpenes and terpenoids, which reflected positively on the sensory scores. The highest taste and odor score (4.72) was seen in the MFIC sample. L. acidophilus La-5® counts (7.49 log cfu/g) and the survival rate (100.69%) of MFIC were significantly higher at the end of storage. Consequently, MFS may be used as a source of flavoring agents in ice cream and MFIC is a satisfactory vehicle for L. acidophilus La-5®. Novelty impact statement: There is no study in the scientific literature on the use of Malus floribunda fruit sauce (MFS) as a potential functional ingredient in probiotic ice cream production. MFS supplementation caused a significant change of volatile compounds in ice cream samples, which reflected positively on the sensory scores. MFS enhanced survival rates of Lactobacillus acidophilus La-5® in ice creams during the 60 days of storage.
AtıfScopus7WoS6OpenAlex10İncele - MakaleAçık Erişim2022Scopus SJRQ3Comparison of Bomaplex Blue CR-L Removal by Adsorption Using Raw and Activated Pumpkin Seed Shells
Irdemez, Şahset; Özyay, Gizem; Ekmekyapar Torun, Fatma; Kul, Sinan; Bingül, Züleyha
In this study, removal of colour from wastewaters prepared synthetically using Bomaplex Blue CR-L was investigated using raw and activated pumpkin seed shells by adsorption in a batch system. The effects of stirring speed, adsorbent concentration, dye concentration, temperature and pH on colour removal were investigated, and adsorption capacities of raw and activated pumpkin seed shells were determined. In addition, adsorption kinetics, isotherm coefficients, activation energies and thermodynamic parameters were calculated. The optimal adsorption conditions were determined as pH = 2, stirring speed of 200 rpm, adsorbent concentration of 10 g L-1 and 30 °C. Under the optimal conditions, the maximum removal efficiency of Bomaplex Blue CR-L using raw pumpkin seed shells was 73.01 %. This value rose to 79.71 % after activation processing was applied. Experimental adsorption data show that the adsorption is more suited to the Langmuir adsorption model and works in accordance with the pseudo-first-order kinetics model. As a result of thermodynamic research, ΔH° and ΔS° were 31.515 kJ mol-1 and 109.952 kJ mol-1 K-1 for the raw adsorbent, respectively. For the activated adsorbent, ΔH° and ΔS° were 43.118 kJ mol-1 and 152.237 kJ mol-1 K-1, respectively. The activation energy of adsorption was calculated as 10.918 kJ mol-1 for the raw adsorbent and 9.882 kJ mol-1 for the activated adsorbent.
AtıfScopus9WoS7OpenAlex9İncele - MakaleAçık Erişim2022Scopus SJRQ2Extraction of low-dimensional features for single-channel common lung sound classification
Engin, M. Alptekin; Aras, Selim; Gangal, Ali
In this study, feature extraction methods used in the classification of single-channel lung sounds obtained by automatic identification of respiratory cycles were examined in detail in order to extract distinctive features at the lowest size. In this way, it will be possible to design a system for the detection of lung diseases, completely autonomously. In the study, automatic separation and classification of 400 respiratory cycles were performed from the single-channel common lung sounds obtained from 94 people. Leave one out cross validation (LOOCV) was used for the calibration and validation of the classification model. The Mel frequency cepstrum coefficients (MFCC), time domain features, frequency domain features, and linear predictive coding (LPC) were used for classification. The performance of the features was tested using linear discriminant analysis (LDA), k-nearest neighbors (k-NN), support vector machines (SVM), and naive Bayes (NB) classification algorithms. The success of combinations of features was explored and enhanced using the sequential forward selection (SFS). As a result, the best accuracy (90.14% in the training set and 90.63% in the test set) was acquired using the k-NN for the triple combination, which included the standard deviation of LPC and the standard deviation and the mean of MFCC. Graphical abstract: [Figure not available: see fulltext.]
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İncele - MakaleAçık Erişim2022Scopus SJRQ4DETERMINATION OF ANTI-UREASE ACTIVITY OF PROPOLIS FROM MARMARA REGION OF TURKEY; [Türkiye'nin Marmara Bölgesinden Elde Edilen Bazi Propolislerin Anti-üreaz Aktivitesinin Belirlenmesi]
Can, Zehra; Kara, Yakup; Kolayli, Sevgi; Çakmak, Ibrahim
Propolis is a natural product collected by honeybees from plants especially flowers and buds by mixing with wax and resin and used for many purposes in hive. It is known that propolis has been used in the treatment of various diseases in traditional medicine for many years and has biological activities such as antioxidant, antimicrobial, antiulcer, antitumor, anti-inflammatory. There is increasing interest in alternative approaches to inhibit Helicobacter pylori (H. pylori) and thereby treat many gastric diseases. This study investigated various properties of raw propolis samples from the Marmara region of Turkey. Anti-urease activity was investigated in propolis samples. The anti-urease activity of IC50 values ranged from 1.110 to 5.870 mg/mL. As a result, it can be said that propolis extract is a good inhibitor that can be used in the treatment of H. pylori to improve human health.
AtıfScopus4OpenAlex4TR Dizin2
İncele - MakaleAçık Erişim2022Investigation of ball milling effect on superconducting properties of oleic acid added bulk MgB2 superconductors produced by two different methods; [İki farklı metot ile üretilen oleik asit katkılı külçe MgB2 süperiletkenlerin süperiletkenlik özellikleri üzerine bilyeli öğütme etkisinin araştırılması]
Erdem, Özge
The effect of ball milling on the microstructure and some superconducting parameters such as flux pinning force (Fp) and critical current density (Jc) of the oleic acid (C18H34O2) added MgB2 bulk samples produced by two different methods, was analysed in this article. In the first method, ball milling was applied to the samples produced by using boron (B) powders coated with carbon (C) released from oleic acid. In the second method, oleic acid was mixed with magnesium (Mg) and B powders at the same time and then the same ball milling process used in the first method was applied to the powder mixture. The structural, magnetic and electrical properties of the produced samples were analysed. The results showed that ball milling process enhances the homogeneity of the structure, decreases the grain size and improves the grain connectivity of MgB2. Also, C substitution into MgB2 lattice resulting in an increase in electron scattering and disorders, enhances after ball milling process. It supplies a significant increase in Jc at high fields and causes a slightly decrease in transition temperature (Tc), especially for the samples produced by using the first method. Because the first method supports the ball milling effect on the homogenous dispersion of oleic acid addition in the MgB2 structure and the C entrance to MgB2 lattice, acting as pinning centres, the best Jc and Fp values at high fields was obtained for the produced samples with second method.
AtıfScopus3OpenAlex1İncele - MakaleAçık Erişim2022Scopus SJRQ2PRE-SERVICE SCIENCE AND COMPUTER TEACHERS’ VIEWS ON TEACHING PRACTICE COURSES
Bulut, Ayhan; Kaban, Abdullatif; Bilen, Ömer
The Teaching Practice course taught in Education Faculties gives pre-service teachers real experience before starting the profession. This study aims to examine the teaching practice courses in the undergraduate programs of education faculties by the views of pre-service science and computer teachers. 50 4th grade students, 25 from the science education department and 25 from the computer and instructional technology education department, participated in the study. Within the scope of the study, the data were collected through online interviews of approximately 30 minutes with the participants, and content analysis was made. According to the findings, pre-service teachers believe that teaching practice courses are insufficient to ensure active participation in lessons in terms of learning gains and content and that they lack a flexible structure that allows them to participate in classes at various grade levels. They also stated that the teaching practice course includes result-oriented measurement and evaluation activities. However, they underlined that the semesters and credits allocated to undergraduate teaching practice courses are insufficient. Furthermore, throughout the process, pre-service teachers reported some communication and coordination issues in the teaching practice course. They suggested that every university with an education faculty should open practice schools that include all levels of compulsory education to overcome the challenges encountered during the process.
AtıfScopus1WoS1İncele - MakaleAçık Erişim2022Scopus SJRQ3Comparison of Serum Adropin Levels in Patients with Diabetes Mellitus, COVID-19, and COVID-19 with Diabetes Mellitus
Aydın, Pelin; Karabulut Uzunçakmak, Sevgi; Tör, İbrahim Hakkı; Bilen, Arzu; Özden, Ayşe
Objective: In the present study, the relationship between a poor prognosis and adropin levels in diabetic patients with coronavirus disease 2019 was investigated by measuring serum adropin levels and levels of D-dimer, C-reactive protein, and ferritin, which are considered prognostic factors for coronavirus disease 2019. Materials and Methods: Hundred volunteer participants treated in the Erzurum Regional Training and Research Hospital were included in this study. Serum adropin levels were measured by enzyme-linked immunosorbent assay. The relationship between serum adropin level and C-reactive protein, ferritin, and D-dimer levels was analyzed by correlation analysis. Results: The participants’ serum adropin levels differed between the groups (P =.0007). The control group had the highest adropin levels among groups. The lowest adropin levels were in the COVID + diabetes mellitus group. Adropin levels of diabetes mellitus, COVID, and diabetes mellitus + COVID groups were significantly decreased when compared to the control (P <.05). There was a significant negative correlation between adropin and C-reactive protein, D-dimer, and ferritin. Conclusion: Adropin can be used as an auxiliary biomarker, a prognostic factor in the early management of coronavirus disease 2019 patients with diabetes mellitus. We think that our study will guide future studies conducted in this field.
AtıfScopus9WoS10OpenAlex13TR Dizin3İncele - MakaleAçık Erişim2022Scopus SJRQ3An investigation of mathematics teachers' specialized content knowledge related to basic concepts about sets
Yazici, Nurullah; Albayrak, Mustafa
This research was carried out in order to examine the specialized content knowledge of mathematics teachers related to teaching basic concepts about sets within the MKT Model. In this study, a holistic single-case study design is used in qualitative research methods. The study group consists of 18 mathematics teachers at different educational background and professional experience in teaching sets selected through the sampling of criterion, which is working in different high schools in one province in the Mediterranean region in the academic year 2016-2017. Research data were obtained using semi-structured interview, observation and document analysis techniques. In the analysis of obtained data, descriptive analysis, content analysis, continuous comparison techniques and special data analysis methods were used together with each data collection tool. The findings of the research show that teachers gave correct answers to the questions asked about the basic concepts of "Why?" in the sets. However, it is clear that the teachers cannot write sufficient reason why the asked questions are "Why?". As a result of the research, it has been determined that the teachers have superficial knowledge about the concepts of "Set, Universal Set, Infinite Set" and "Equal Set". However, it was determined that teachers made explanations with a general mathematical knowledge based on the characteristics of the concept rather than providing persuasive mathematical explanations to the questions asked.
AtıfOpenAlex1TR Dizin1İncele - MakaleYalnız künye2022Scopus SJRQ1Structural and bioactive characteristics of a dextran produced by Lactobacillus kunkeei AK1
Yilmaz, Mustafa Tahsin; İspirli, Hümeyra; Taylan, Osman; Bilgrami, Anwar L.; Dertli, Enes
In this study, structural and techno-functional characteristics of an exopolysaccharide (EPS) produced by Lactobacillus kunkeei AK1 were determined. High-performance liquid chromatography (HPLC) analysis demonstrated that EPS AK1 was composed of only glucose units. 1H and 13C Nuclear magnetic resonance (NMR) analysis revealed that EPS AK1 was a dextran type EPS containing 4.78% (1 → 4)-linked α-D-glucose branches. The molecular weight of EPS AK1 was determined to be 45 kDa by Gel Permeation Chromatography (GPC) analysis. A high level of thermal stability up to 280 °C was determined for dextran AK1 detected by Differential scanning calorimetry (DSC) and Thermogravimetric analysis (TGA). Dextran AK1 appeared as regular spheres with compact morphology and as irregular particles in the solution with no clear cross-linking between the chains of the polysaccharide observed by Scanning electron microscopy (SEM) and Atomic force microscopy (AFM) analysis, respectively. X-ray diffraction analysis (XRD) analysis demonstrated that dextran AK1 had a crystalline structure. A relatively strong antioxidant activity was observed for dextran AK1 determined by 2,2-diphenyl-1-picrylhydrazyl (DPPH), 2,2′-azino-bis-3-ethylbenzothiazoline-6-sulfonic acid (ABTS) radical scavenging and cupric reducing antioxidant capacity (CUPRAC) tests. Finally, only a digestion ratio of 3.1% was observed for dextran AK1 following the in vitro simulated gastric digestion test.
AtıfScopus43WoS39OpenAlex41İncele - MakaleYalnız künye2022Scopus SJRQ3Biocatalytic asymmetric synthesis of (S)-1-indanol using Lactobacillus paracasei BD71
Kalay, Erbay; Dertli, Enes; Şahin, Engin
Enantiopure benzo-fused cyclic alcohols have been used as a building block of a drug for Parkinson’s disease. Biocatalytic reduction of ketones is one of the most promising and significant routes to prepare optically active alcohols. In this study, the reductive capacity of seven lactic acid bacteria (LAB) strains were investigated as whole-cell biocatalyst in the enantioselective reduction of 1-indanone (1). Lactobacillus paracasei BD71 was found to have the best reductive capacity. Effects of different parameters such as pH, incubation time, agitation speed and temperature, on enantiomeric excess (ee) and conversion were investigated in a bioconversion. (S)-1-indanol ((S)-2) could be used as precursor for the synthesis of rasagiline mesylate TVP1012 for the therapy of Parkinson’s illness. It was produced in gram-scale (5.24 g), high yield (93%) and enantiomerically pure form using L. paracasei BD71 whole-cell biocatalysts. Also, to our knowledge, this is the first report on production of (S)-2 using whole-cell catalyst in enantiopure form, excellent yield, conversion and gram scale. This is a cheap, clean and eco-friendly process for production of (S)-2 compared to chemical processes.
AtıfScopus6WoS6OpenAlex6İncele - KitapAçık Erişim2022Special Human Resource Management Practices and Strategy
Yazici, Ömer
Today, one of the most valuable assets of companies is their workforce. Primarily, the importance of information is increased and the human factor that absorbs and uses it by creating value has become much more essential. One of the most critical steps that managers need to take to be successful is to enhance human power in the most efficient way possible. Companies that want to be long-lasting need to make HR the main item on their agenda. Human resource practices are critical for companies to survive. In addition to firms in general, family firms are also a special and the most common type of business in the economy. Hence, family firm HR practices are also an important part of this book. Among the most famous features of a family firm, complex HR management practices are on top of it all. Owners and family members are all aware that non-family employees are needed, and non-family managers are required for the success and sustainability of the family firm. Hence, family firms cannot have biased, bifurcated, or different HR practices towards non-family employees. Readers will find this book comprehensive and inclusive of new issues of HR management literature. The book is comprised of chapters, each describing current and important practices and problems of HR management. Along with the family firm-specific problems like nonfamily managers, women entrepreneurship, and nepotism, chapters cover the state-of-the-art topics and findings in the HR management literature. This includes organizational development and HR management relationship, discrimination and nepotism, women in family firms and tourism, HR accounting and digital age, quality and management, behavior, and change management. Students and scholars of human resource management, along with the leaders of modern management teams, will benefit from this book from the first page to the last page. Each chapter will carry its reader to the next level of understanding of issues and findings of human resource management.
AtıfOpenAlex4İncele - MakaleAçık Erişim2022Multicultural education in Turkish social studies curriculum and textbooks
Yılmaz, Sevda
Multicultural education is an educational approach that is guided by cultural components and is based on cultural diversity. Students are expected to gain skills and values in the education process with the social studies course, such as accepting cultural diversity, respecting human rights, and assessing different perspectives and ideas, all of which are crucial in multicultural education. From this perspective, it is clear that this notion of education is intertwined with the social studies course. Integrating a multicultural education approach into the social studies curriculum and textbooks is viewed as critical. This paper aims to determine the status of the multicultural education approach in both social studies curriculum and textbooks. The study employed the document analysis approach, which is one of the qualitative research methodologies. As data sources, the research used the 2018 social studies course curriculum as well as social studies textbooks for 4th, 5th, 6th, and 7th grade. The paper attempted to establish the status of how multicultural education is included in the curriculum and social studies textbooks. The results of the study demonstrate that the multicultural education approach is represented in the curriculum, that the multicultural education approach in textbook texts is consistent with acquisitions, but that the activities are lacking.
- MakaleYalnız künye2022Scopus SJRQ3Optimization of asymmetric reduction conditions of 1-(benzo [d] [1,3] dioxol-5-yl) ethanone by Lactobacillus fermentum P1 using D-optimal experimental design-based model
Özdemir, Akın; Dertli, Enes; Şahin, Engin
The biocatalytic asymmetric reduction of prochiral ketones is a significant transformation in organic chemistry as chiral carbinols are biologically active molecules and may be used as precursors of many drugs. In this study, the bioreduction of 1-(benzo [d] [1,3] dioxol-5-yl) ethanone for the production of enantiomerically pure (S)-1-(1,3-benzodioxal-5-yl) ethanol was investigated using freeze-dried whole-cell of Lactobacillus fermentum P1 and the reduction conditions was optimized with a D-optimal experimental design-based optimization methodology. This is the first study using this optimization methodology in a biocatalytic asymmetric reduction. Using D-optimal experimental design-based optimization, optimum reaction conditions were predicted as pH 6.20, temperature 30 °C, incubation time 30 h, and agitation speed 193 rpm. For these operating conditions, it was estimated that the product could be obtained with 94% enantiomeric excess (ee) and 95% conversion rate (cr). Besides, the actual ee and cr were found to be 99% tested under optimized reaction conditions. These findings demonstrated that L. fermentum P1 as an effective biocatalyst to obtain (S)-1-(1,3-benzodioxal-5-yl) ethanol and with the D-optimal experimental design-based optimization, this product could be obtained with the 99% ee and 99% cr. Finally, the proposed mathematical optimization technique showed the applicability of the obtained results for asymmetric reduction reactions.
AtıfScopus6WoS6OpenAlex7İncele - MakaleYalnız künye2022Scopus SJRQ1Comparison of the probiotic characteristics of Lactic Acid Bacteria (LAB) isolated from sourdough and infant feces
Kaya, Yasemin; Erten, Tayyibe; Vurmaz, Melike; İspirli, Hümeyra; Şimşek, Ömer; Dertli, Enes
Probiotics are beneficial microorganisms with certain characteristics such as survival under gastrointestinal conditions, adhesion to intestinal surface and different functions which result in several health benefits to host. With this regards, this study aimed to isolate Lactic Acid Bacteria (LAB) from sourdough and human feces as two different environments and to test their potential probiotic functions. In total nine distinct isolates were assessed with several probiotic functions such as in vitro adhesion to human colon cells, antimicrobial activities and survival under harsh gastrointestinal conditions. In general, distinct strains showed strong antimicrobial activity against the pathogenic and fungal strains tested in this study. Importantly, the adhesion levels to HT29 cells were determined between 0.29 % and 9.54% and Lactobacillus paracasei F7B showed the highest adhesion. All isolates tolerated the bile salt after 24 h and the infant feces isolates showed good survival characteristics at pH 4.
AtıfScopus18WoS15OpenAlex18İncele - MakaleYayıncıda açık erişim2022Scopus SJRQ3EFFECTS OF MOLAR RATIO, FREQUENCY, WATER CONTENT AND TEMPERATURE ON DIELECTRIC PROPERTIES OF DEEP EUTECTIC SOLVENTS
Kutlu, N.; Yilmaz, M.S.; Erdem, G.M.; Sakiyan, O.; Isci, A.
The aim of the study is to determine the effect of process parameters on dielectric propertiesof deep eutectic solvents (DESs), which have beenwidely used in recent years. In this study, DESs wereprepared using choline-chloride as the hydrogenbondacceptor and glycerol, formic acid and aceticacid as the hydrogen-bond donor. The effect of differentprocess parameters such as molar ratio (1:2, 1:3and 1:4), water content (15%, 30% and 45%), temperature(25, 50 and 75 °C) and frequency on dielectricproperties of the DESs were examined. The highestdielectric constant values were found to be38.13±0.54, 44.96±0.07 and 46.74±0.02 for glycerol,formic acid and acetic acid, respectively for the processconditions of 25 °C temperature, 45% water contentand 1:4 molar ratio (at 2450 MHz). Moreover, forall DESs, it was found that a decrease in water contentresulted in a decrease in both dielectric constant andloss factor values. This can be explained by the absenceof free water molecules which are responsiblefrom dipole rotation mechanism. In light of the results,if DES will be used in microwave processes, formicor acetic acid containing DESs might give moresuccessful results compared to the ones with glycerol
AtıfScopus7WoS6OpenAlex8İncele - MakaleAçık Erişim2022Scopus SJRQ1Calibration-Free Time-Domain Free-Space Permittivity Extraction Technique
Hasar, Ugur C.; Ozturk, Gokhan; Kaya, Yunus; Ertugrul, Mehmet
A time-domain free-space technique has been proposed to extract relative permittivity ( _r ) and effective conductivity ( σ _e ) of low-loss dielectric samples using their metal- and air-backed calibration-free reflected powers. Numerical computations and 3-D electromagnetic simulations were performed to validate the method. A sensitivity analysis was carried out to examine its accuracy. Calibration-free time-domain free-space measurements over 1-12 GHz were conducted by VNA to extract _r and σ _e of polyethylene and polypropylene low-loss samples.
AtıfScopus29WoS28OpenAlex29İncele