16 results on '"Esra Avci"'
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2. Influence of Different Drying Techniques on the Drying Kinetics, Total Bioactive Compounds, Anthocyanin Profile, Color, and Microstructural Properties of Blueberry Fruit
- Author
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Alican Akcicek, Esra Avci, Zeynep Hazal Tekin-Cakmak, Muhammed Zahid Kasapoglu, Osman Sagdic, and Salih Karasu
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Chemistry ,QD1-999 - Published
- 2023
- Full Text
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3. Strengthening of Reinforced Concrete Beams via CFRP Orientation
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Mehmet Eren Uz, Yunus Guner, and Esra Avci
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concrete structures ,carbon fiber-reinforced polymers ,strengthening ,concrete damage plasticity ,confined concrete ,Building construction ,TH1-9745 - Abstract
The utilization of externally bonded carbon fiber-reinforced polymers (CFRPs) and glass fiber-reinforced polymers (GFRPs) for reinforcing and retrofitting components has garnered considerable interest recently, as such composites provide beneficial properties, including a high modulus of elasticity, high strength, and low weight. This work conducts a finite element analysis, verified through laboratory experiments on 14 reinforced concrete (RC) beams. The primary focus is the final load of these components, considering varying CFRP orientations relative to the loading direction. In this research, the performances of control beams and RC beams are compared to assess the effectiveness and efficiency of different strengthening methods. The results demonstrated that bonding CFRP sheets with V-shaped end anchorages on the tension side was highly effective in improving the flexural capacity of RC beams in the weaker concrete strength group. This strengthening method resulted in a substantial increase in strength (of around 29.8%) in the higher concrete strength group. In addition, utilizing V-shaped end anchorages to bond CFRP sheets on the tension side proved to be a highly efficient technique for improving flexural strength. Conversely, bonding inclined CFRP strips to the sides of RC beams was highly effective at enhancing the shear capacity of the beams. These outcomes convincingly demonstrate the effectiveness of FRP for the reinforcement of structural components. The specimens strengthened with inclined strips exhibited enhanced shear and deformation capacity compared to those strengthened with vertical strips.
- Published
- 2023
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4. Capsaicin Rich Low-Fat Salad Dressing: Improvement of Rheological and Sensory Properties and Emulsion and Oxidative Stability
- Author
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Esra Avci, Zeynep Hazal Tekin-Cakmak, Muhammed Ozgolet, Salih Karasu, Muhammed Zahid Kasapoglu, Mohamed Fawzy Ramadan, and Osman Sagdic
- Subjects
hot pepper seed oil ,dihydrocapsaicin ,antioxidants ,fat replacers ,oxidation kinetics ,rheology ,Chemical technology ,TP1-1185 - Abstract
This study aimed to investigate the potential use of cold-pressed hot pepper seed oil by-product (HPOB) in a low-fat salad dressing to improve its rheological properties, emulsion, and oxidative stability. The total phenolic content (TPC), the 2,2-Diphenyl-1-picrylhydrazyl (DPPH) radical scavenging activity, and CUPRIC reducing antioxidant capacity (CUPRAC) values were 317.4 mg GAE/100 g, 81.87%, and 6952.8 mg Trolox/100 g, respectively. The capsaicin, dihydrocapsaicin, and total carotenoid content were 175.8 mg/100 g, 71.01 mg/100 g, and 106.3 µg/g, respectively. All emulsions indicated shear-thinning, viscoelastic solid-like behavior, and recoverable characteristics, which were improved via enrichment with HPOB. The thermal loop test showed that the low-fat sample formulated with 3% HPOB indicated little change in the G* value, showing that it exhibited high emulsion stability. The induction period values (IP) of the salad dressing samples containing HPOB (between 6.33 h and 8.33 h) were higher than the IP values of the control samples (3.20 h and 2.58 h). The enrichment with HPOB retarded the formation of oxidative volatile compounds of hexanal, nonanal, and 1-octene-3-ol. According to the results presented in this study, HPOB could be effectively used in a low-fat salad dressing to enhance its rheological characteristics and oxidative stability.
- Published
- 2023
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5. The Potential Use of Cold-Pressed Coconut Oil By-Product as an Alternative Source in the Production of Plant-Based Drink and Plant-Based Low-Fat Ice Cream: The Rheological, Thermal, and Sensory Properties of Plant-Based Ice Cream
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Muhammed Zahid Kasapoglu, Osman Sagdic, Esra Avci, Zeynep Hazal Tekin-Cakmak, Salih Karasu, and Rabia Sena Turker
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plant-based ice cream ,low-fat ice cream ,coconut by-products ,fat replacer ,Chemical technology ,TP1-1185 - Abstract
This study aimed to investigate the potential use of cold-pressed coconut oil by-products (COB) as a low-cost alternative source for plant-based drink and ice cream production. Firstly, a plant-based drink was produced from cold-pressed coconut oil by-products (COB drink) and compared with a commercial coconut drink. The fat, protein, and zeta potential values of coconut drink obtained from COB were higher than those of the commercial samples. In addition, the particle size value of the drink obtained from COB was found to be lower than that of the commercial drink. In the second stage, full-fat and low-fat plant-based ice cream samples using COB drink were produced and compared to control ice cream samples (produced by the commercial coconut drink) in terms of rheological, sensorial, and thermal properties. Rheological analysis showed that all plant-based ice cream samples indicated pseudoplastic, solid-like, and recoverable characteristics. Low-fat commercial control ice cream samples (C1) indicated the lowest K value (9.05 Pasn), whereas the low-fat plant-based ice cream sample produced by the COB drink (COB-3) exhibited the highest K value (17.69 Pasn). ΔHf values of the plant-based ice cream samples varied from 144.70 J/g to 172.70 J/g. The low-fat COB ice cream stabilized with 3% COB and full-fat COB ice cream samples showed lower ΔHf values than control ice cream samples, indicating that the COB ice cream showed desired thermal properties. The COB drink may be utilized in plant-based ice cream without altering sensory qualities, and low-fat ice cream could be manufactured in the same manner to attain full-fat ice cream quality characteristics. The results of this study demonstrated that COB can be successfully used as an inexpensive raw material source in the production of full-fat and reduced-fat vegetable-based ice cream.
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- 2023
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6. Mass Image in Stomach: A Case of Splenic Artery Aneurysm
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Yeliz Cagan Appak, Masallah Baran, Esra Avci, Miray Karakoyun, and Orkan Ergun
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Medicine - Published
- 2018
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7. Effect of Different Drying Techniques on Total Bioactive Compounds and Individual Phenolic Composition in Goji Berries
- Author
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Busra Turan, Zeynep Hazal Tekin-Cakmak, Selma Kayacan Çakmakoglu, Salih Karasu, Muhammed Zahid Kasapoglu, and Esra Avci
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Process Chemistry and Technology ,ultrasound-assisted freeze-drying ,Chemical Engineering (miscellaneous) ,goji berry ,Bioengineering ,drying ,phenolic compounds ,ultrasound-assisted vacuum drying - Abstract
In recent years, interest in the consumption of dried goji berries has increased due to its high bioactive properties. Alternative drying methods that provide faster drying and better preservation of bioactive properties should be developed. This study aims to investigate the effect of different drying methods on the drying time and quality characteristics of the goji berry; namely, hot-air drying (HAD), ultrasound-assisted vacuum drying (USVD), vacuum drying (VD), freeze-drying (FD), and ultrasound-pretreated freeze-drying (USFD). The drying kinetic, total phenolic content, antioxidant capacity, phenolic profile, carotenoid profile, and color change of the goji berry fruit were determined. The drying times for VD, USVD, and HAD varied between 275–1330 min. USVD treatment showed faster drying behavior than the other two drying methods. The total phenolic content (TPC) value of dry samples varied between 1002.53–1238.59 mg GAE/g DM. USVD treatments exhibited a higher total phenolic content (TPC) value than all other drying methods. DPPH and CUPRAC values varied between 15.70–29.90 mg TE/g DM and 40.98–226.09 mg TE/g DM, respectively. The total color change (ΔE) value ranged between 4.59 and 23.93 and HAD dried samples showed the highest ΔE of all samples. The results of the phenolic profile were consistent with TPC analysis. HAD caused higher phenolic compound degradation than VD, USVD, and FD. The results of this study showed that different drying techniques significantly affected the drying rate and retention of bioactive components of the goji berry fruit, and the USVD and VD methods could be used as an alternative to the HAD method. This study concluded that USVD and FD could be considered as suitable drying methods and could be used as alternatives to HAD in the drying of goji berries.
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- 2023
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8. Production of Freeze-Dried Flaxseed Oil Powders by Using Rocket Seed Gum as an Alternative Novel Encapsulation Agent to Improve Oxidative Stability
- Author
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Esra Avci, Ayse Karadag, and Salih Karasu
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Multidisciplinary - Abstract
Flaxseed oil rich in α-linolenic acid (ALA) has many health beneficial properties, but suffers from oxidation degradation due to its unsaturated nature, and may need a protective delivery system to apply to different food formulations. In this study, the rocket seed gum was used as a novel encapsulation agent to produce freeze-dried powders. The rocket seed gum (RSG), gum arabic (GA), and their combination were used at two different oil: wall material ratios. Replacing GA with RSG changed the flow behavior of emulsions from Newtonian to shear-thinning, also RSG addition improved the rheological properties of flaxseed emulsion and provided viscoelastic solid characteristics. The encapsulation efficiency (EE %) of flaxseed oil was changed between 38.14 and 52.37%. The effect of wall material type was not significant while the ratio of wall material to oil was significant (p
- Published
- 2021
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9. Bazı Gıdalardaki Bozulma Etkeni Maya Türlerinin İzolasyonu ve Tanımlanması
- Author
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Zülal Kesmen, Mine Erdem Büyükkiraz, Esra Avci, Neslihan Kahraman, Kapadokya Üniversitesi, Sağlık Bilimleri Yüksekokulu, Beslenme ve Diyetetik Bölümü, and Erdem Büyükkiraz, Mine
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maya ,tanımlama ,Gıda bozulması ,rep-PCR ,General Earth and Planetary Sciences ,dizi analizi ,General Environmental Science - Abstract
TARAMATRDİZİN Gıdalarda bozulmaya neden olan mayaların belirlenmesi özellikle, kontaminasyon döngüsünün kırılması ve bozulma etkeni türlere özgü koruyucu önlemlerin alınması bakımından önemli görülmektedir. Bu nedenle bu çalışmada duyusal olarak tüketilebilirliğini kaybetmiş süt ürünleri, et ürünleri, taze meyve ve sebzeler, turşu ve salamura ürünler olmak üzere farklı gıda gruplarına ait örneklerin maya profilleri tespit edilmiştir. Bu amaçla yerel marketlerden, halk pazarlarından ve ev yapımı ürünlerden toplanan toplam 86 örnek analiz edilmiştir. Analiz edilen örneklerden izole edilen toplam 1032 maya izolatı tanımlanmıştır. Bunun için her bir örnekten saflaştırılan maya izolatları, tekrarlayan dizilere dayalı PCR (rep-PCR) yöntemiyle gruplandırılmıştır. Daha sonra her bir grubu temsil edecek sayıda izolat 26 S ribozomal DNA üzerindeki 665 bç’lik bölge (D1/D2 bölgesi) ve ribozomal DNA’nın transkript olan ara bölgesini (ITS) hedef alan dizi analizi yöntemi ile tanımlanmıştır. Tanımlanan izolatların dağılımı üründen ürüne değişmekle birlikte Pichia fermentans (% 11.60) ve Debaryomyces hansenii (% 11.50) tüm izolatlar içerisinde sayıca en baskın türler olarak bulunmuş ve bu türleri Candida zeylanoides (% 10.08) ve Kluyveromyces marxianus (% 8.04) takip etmiştir. Sonuçta her bir örnek grubundaki baskın maya türleri belirlenmiş ve analiz edilen gıda gruplarına özgü maya profilleri elde edilmiştir.
- Published
- 2020
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10. Enrichment of lecithin with phenolics from olive mill wastewater by cloud point extraction and its application in vegan salad dressing
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Ayse Karadag, Selma Kayacan Cakmakoglu, Rusen Metin Yildirim, Salih Karasu, Esra Avci, Hayrettin Ozer, and Osman Sagdic
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General Chemical Engineering ,General Chemistry ,Food Science - Published
- 2022
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11. Recombinant Co-Expression of Collagen A1 (I) Fragment with the Prolyl 4-Hydroxylases (P4H) Subunits in Komagataella phaffii
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Esra Avci and Zülal Kesmen
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Fragment (computer graphics) ,law ,Chemistry ,Komagataella phaffii ,Recombinant DNA ,Microbiology ,Molecular biology ,Recombination ,law.invention - Abstract
Recombinant collagen and collagen-like products are increasingly replacing animal-sourced collagen that is difficult to produce in safe and standard quality. In this study to produce hydroxylated collagen, a 400 base pair collagen fragment of the bovine COL1A1 gene was co-expressed with prolyl-4-hydroxylase subunit α (P4Hα) and prolyl-4-hydroxylase subunit β(P4Hβ) encoding the P4H enzyme in Komagataella phaffii. For this purpose, each target gene was inserted into the pPICZαA vector and then cloned in E. coli DH5α cells. Subsequently, co-expression vectors were constructed using recombinant vectors isolated from positive clones according to the in vitro multimer ligation method. All recombinant expression and co-expression vectors were transformed into K. phaffii X33 cells by electroporation. The results of reverse transcriptase-polymerase chain reaction (PCR) proved that all target genes were transcribed by recombinant strains. The expression of recombinant proteins was performed for 96 hours by methanol-fed cultivation, and the concentration of the purified proteins from the culture medium was measured by the His-Tag enzyme-linked immunosorbent assay (ELISA) method. The concentrations of rP4Hα and rP4Hβ, and rCol1 proteins expressed individually by recombinant strains were determined to be 10.69 µg/L, 10.74 µg/L, and 8.61 µg/L, respectively, while the concentrations of co-expressed rP4Hα/β and rP4Hα/β/rCol1 proteins were 7.82 µg/L and 5.02 µg/L, respectively. These results showed that the target genes were successfully expressed and co-expressed in the recombinant K. phaffii cell.
- Published
- 2020
12. İŞVEREN MARKASI ALGISI İLE ÖRGÜTSEL SESSİZLİK ARASINDAKİ İLİŞKİDE ÖRGÜTSEL VATANDAŞLIK DAVRANIŞININ ROLÜ
- Author
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Ayla Zehra Öncer and Esra Avci
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HF5001-6182 ,Commerce ,Management ,HB1-3840 ,İşveren markası,Örgütsel Sessizlik,Örgütsel Vatandaşlık Davranışı,İnsan Kaynakları Yönetimi ,HF1-6182 ,Economics as a science ,İşletme ,i̇nsan kaynakları yönetimi ,Economic theory. Demography ,i̇şveren markası ,Business ,örgütsel vatandaşlık davranışı ,örgütsel sessizlik ,HB71-74 - Abstract
Bu çalışmanın amacı işveren markası algısının örgütsel sessizlik davranışları üzerinde etkisinde örgütsel vatandaşlık davranışının rolünün araştırılmasıdır. Çalışanların işveren markası algılarının sessizlik davranışlarını etkileyip etkilemediği ve bu iki değişken arasındaki ilişkide örgütsel vatandaşlık davranışının nasıl bir rol üstlendiğinin tespiti hedeflenmiştir. Ek olarak çalışanların demografik özelliklerine göre farklılıklar olup olmadığı da araştırılmıştır. Araştırma çerçevesinde bir kamu bankasının 16 şubesinde 140 çalışandan anket yoluyla elde edilen veriler SPSS programı ile analiz edilmiştir. Araştırma sonunca göre çalışanların işveren markası algısı, örgütsel sessizlik ve örgütsel vatandaşlık davranışları yüksek çıkmıştır. Ayrıca, işveren markası algısı ile örgütsel sessizlik ilişkisinde örgütsel vatandaşlık davranışının kısmen düzenleyici rolü tespit edilmiştir.
- Published
- 2020
13. Enhancing Gluten-Free Muffins with Milk Thistle Seed Proteins: Evaluation of Physicochemical, Rheological, Textural, and Sensory Characteristics
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Muhammed Ozgolet, Muhammed Zahid Kasapoglu, Esra Avcı, and Salih Karasu
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milk thistle seed ,protein isolate ,oilseed by-product ,oxidative stability ,rheology ,gluten-free muffin ,Chemical technology ,TP1-1185 - Abstract
This study investigated the potential utilization of milk thistle seed protein (MTP) isolates in gluten-free muffins to enhance the protein quantity and technological attributes. MTP was employed to partially substitute a blend including equal amounts of rice flour and corn starch (RCS) at 3%, 6%, 9%, and 12%. The study encompassed a rheological assessment of muffin batters and physicochemical, textural, and sensory analyses of the muffins. The consistency coefficient (K) of muffin batters exhibited an increase with the incorporation of MTP, with all batters demonstrating shear-thinning behavior (n < 1). The dough samples exhibited solid-like characteristics attributed to G′ > G″, indicative of their viscoelastic nature. The storage modulus (G′) and loss modulus (G″) escalated with higher levels of MTP, suggesting an overall enhancement in dough viscoelasticity. The muffin containing wheat flour displayed the lowest hardness value, followed by MTP-added muffins at ratios of 12% and 9%. Additionally, MTP-added muffins exhibited greater springiness values than control samples without MTP (C2). However, the oxidative stability of MTP-added muffins was lower than the wheat control muffin (C1) and gluten-free control muffin. The protein content in muffins increased with MTP addition, reaching parity with wheat flour muffins at 6% MTP replacement. Sensory analysis revealed that substituting RCS with up to 6% MTP did not significantly alter the overall quality (p > 0.05), whereas higher MTP levels (9% and 12%) led to a decline in sensory attributes. Incorporating MTP at up to 6% yielded protein-enriched muffins with sensory characteristics comparable to the wheat flour muffin (C1). Furthermore, higher MTP additions (9% and 12%) conferred more favorable textural properties than the C2 muffin. However, the oxidative stability of the control muffins was found to be higher than that of MTP-added muffins. This study suggested that MTP could be a potential ingredient to increase the protein amount and specific volume of gluten-free muffins and to improve textural attributes such as springiness and hardness.
- Published
- 2024
- Full Text
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14. Mass Image in Stomach: A Case of Splenic Artery Aneurysm
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Orkan Ergün, Esra Avci, Maşallah Baran, Miray Karakoyun, and Yeliz Cagan Appak
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medicine.medical_specialty ,Splenic artery aneurysm ,business.industry ,Stomach ,lcsh:R ,lcsh:Medicine ,General Medicine ,030204 cardiovascular system & hematology ,03 medical and health sciences ,0302 clinical medicine ,Text mining ,medicine.anatomical_structure ,Correspondence ,medicine ,Radiology ,business ,030217 neurology & neurosurgery - Published
- 2018
15. The Effect of Cold Press Chia Seed Oil By-Products on the Rheological, Microstructural, Thermal, and Sensory Properties of Low-Fat Ice Cream
- Author
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Ilker Atik, Zeynep Hazal Tekin Cakmak, Esra Avcı, and Salih Karasu
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by-product ,rheological properties ,optimization ,melting profile ,Chemical technology ,TP1-1185 - Abstract
This study aimed to investigate the utilization of cold-pressed chia-seed oil by-products (CSOB) in a low-fat ice cream formulation as a fat replacer and stabilizer. In the study, ice cream emulsion mixtures were formulated by using 0.2–0.4% xanthan gum (XG), 2.5–12.5% fat, and 1–3% CSOB. Optimization was performed using the response surface methodology (RSM) and full factorial central composite design (CCD) based on the flow behavior rheological properties of the emulsions obtained from 17 different experimental points. All of the emulsion samples showed non-Newtonian shear-thinning flow behavior. The consistency coefficient (Κ) values of the emulsion samples were found to be 4.01–26.05 Pasn and were significantly affected by optimization parameters (p < 0.05). The optimum formulation was determined as 0.29% XG, 2.5% CSOB, 2.5% fat. The low-fat (LF-IC) and full-fat control samples (FF-IC) were compared to samples produced with an optimum formulation (CBLF-IC) based on the steady shear, frequency sweep, and 3-ITT (three interval thixotropy test) rheological properties, thermal properties, emulsion stability, light microscope images, and sensory quality. CBLF-IC showed similar rheological behavior to FF-IC. The mix of CBLF-IC showed higher emulsion stability and lower poly-dispersity index (PDI) value and fat globule diameters than those of FF-IC and LF-IC. The thermal properties of the samples were significantly affected by the addition of CSOB in an ice cream mix. CBLF-IC exhibited a lower temperature range (ΔT), enthalpy of fusion (ΔHf), and freezing point temperature (Tf) than those of FF-IC and LF-IC. While CBLF-IC exhibited a higher overrun value than other samples, it showed similar sensory properties to the FF-IC sample. The results of this study suggested that CSOB could be used successfully in low-fat ice cream production. This study also has the potential to gain new perspectives for the evaluation of CSOB as a fat substitute in a low-fat ice cream.
- Published
- 2021
- Full Text
- View/download PDF
16. The Effect of Peer Education upon Breast Self-Examination Behaviors and Self-Esteem among University Students
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Gülsün Ayran, Meryem Fırat, Gülden Küçükakça, Beyazıt Cüneydioğlu, Kübra Tahta, and Esra Avcı
- Subjects
breast self-examination ,self-esteem ,peer education ,student ,Neoplasms. Tumors. Oncology. Including cancer and carcinogens ,RC254-282 ,Medicine - Abstract
Objective: The current study was semi-experimentally designed in order to identify the effect of peer education upon breast self-examination (BSE) behaviors and self-esteem among university students.Materials and methods: The study was undertaken with 100 female students who studied at Erzincan University. Peer educators were recruited from the 4th year students. The data were collected with a questionnaire form, BSE skill form and Rosenberg Self-esteem Scale in two phases one month before and after the BSE peer education. For the data assessment; percentage distributions, frequency, mean, standard deviation and Simple T test were employed.Results: The mean age of the participant students was 20.45±1.67 year and all of them were single. It was found that during the first data collection phase, only 16 % of the students performed BSE while during the final data collection phase, the rate of the students performing BSE rose to 77 %. During the first data collection phase, students received a mean score of 2.36±4.13 from BSE skill form while during the last data collection phase they had a mean score of 10.70±3.40 from BSE skill form. When the scores obtained from Rosenberg Self-esteem Scale by the students were examined, it was seen that they received a mean score of 1.20±1.34 during the first data collection phase while they had a mean score of 0.84±1.07 during the final data collection phase.Conclusion: Although short-term feedback was obtained, it was noted that students’ BSE knowledge and skills increased considerably.
- Published
- 2017
- Full Text
- View/download PDF
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