129 results on '"Yılmaz, Şahin"'
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2. Investigation of the relationship between cultural sensitivity and effectiveness levels among nursing students
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Kardas, Ulker and Yilmaz Sahin, Sibel
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- 2023
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3. Investigation of the relationship between social appearance anxiety and perceived social support in patients with burns
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Ayhan, Hatice, Savsar, Adile, Yilmaz Sahin, Sibel, and Iyigun, Emine
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- 2022
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4. Induced Pluripotent Stem Cell‐Derived Parathyroid Organoids Resemble Parathyroid Morphology and Function.
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Şenkal‐Turhan, Selinay, Bulut‐Okumuş, Ezgi, Aydın, Muhterem, Başak Türkmen, Neşe, Taşlıdere, Aslı, Şahin, Fikrettin, Yılmaz, Şahin, Akkuş Süt, Pınar, and Doğan, Ayşegül
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PLURIPOTENT stem cells ,PARATHYROID glands ,TRANSMISSION electron microscopy ,SCANNING electron microscopy ,GENE expression - Abstract
The primary role of the parathyroid glands is to maintain calcium homeostasis through the secretion of parathyroid hormone (PTH). The limited proliferative capacity and differentiation of parathyroid cells hinder the generation of cell therapy options. In this study, parathyroid organoids are successfully generated from human‐induced pluripotent stem cells (hiPSCs). At the end of the 20 days of differentiation, the parathyroid organoids exhibited distinct parathyroid morphology. Stereomicroscope, scanning electron microscopy (SEM), and transmission electron microscopy (TEM) analysis demonstrated the 3D arrangement of the cell layers in which intracellular structures of parathyroid cells resemble human parathyroid cellular morphology. Comprehensive molecular analyses, including RNA sequencing (RNA‐Seq) and liquid chromatography/mass spectrometry (LC‐MS/MS), confirmed the expression of key parathyroid‐related markers. Protein expression of CasR, CxCr4, Gcm2, and PTH are observed in parathyroid organoids. Parathyroid organoids secrete PTH, demonstrate active intercellular calcium signaling, and induce osteogenic differentiation via their secretome. The tissue integration potential of parathyroid organoids is determined by transplantation into parathyroidectomized rats. The organoid transplanted animals showed significant elevations in PTH‐related markers (CasR, CxCr4, Foxn1, Gcm2, and PTH). PTH secretion is detected in organoid‐transplanted animals. The findings represent a significant advancement in parathyroid organoid culture and may offer a cellular therapy for treating PTH‐related diseases, including hypoparathyroidism. [ABSTRACT FROM AUTHOR]
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- 2024
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5. Characteristics of Patients who Visited the Emergency Department due to self-poisoning Suicide Attempt: A Retrospective Study.
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Nefise Büşra Çelik, Avni Uygar Seyhan, Semih Korkut, Erdal Yılmaz, Nurhayat Başkaya, and Nurdan Yılmaz Şahin
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Suicide ,sociodemographic characteristics ,self-poisoning ,psychotropic drugs ,Surgery ,RD1-811 ,Medical emergencies. Critical care. Intensive care. First aid ,RC86-88.9 - Abstract
Background: The aim of this study is to evaluate the sociodemographic characteristics, clinical conditions, and results of patients who were admitted to the emergency department (ED) due to suicide attempts by self-poisoning intentionally. Methods: This retrospective study was conducted between January 1 and December 31, 2017, in the ED of Istanbul Lutfi Kırdar City Hospital, University of Health Sciences. Patients of only attempted suicide through taking overdose drugs with the intent of self-poisoning and over 12 ages were included in the study, which included 391 cases. Patients who attempted suicide in any different ways than self-poisoning were excluded. Results: Our study is consisted 69.8% (n=273) of female and 30.2% (n=18) of male patients. The mean age of the total cases was 31.01±12.064, which the youngest case being 14 years old and the oldest being 73 years old. The marital status of the cases is as follows: 140 (35.8%) married, 205 (52.4%) unmarried, 42 (10.7%) divorced, and 4 (1%) widow/widower. Istanbul is covering a major population of patients (93.1%) as a living place. The study has resulted in 58.3% ED discharge, 27.1% hospital leaving, and 10.5% Psychiatry unit admission. It can be stated that elderly people aim for death more than young people via their suicide attempts. The reasons for the suicide of the patients included in the study were grouped as a secondary gain, anger, and death. We found that secondary gain was the reason for teens mostly. We divided into categories clinical results as ED discharge, psychiatrist hospitalization, Intensive care unit (ICU) admission, and discharge against medical advice (DAMA). The patients who attempted suicide with the aim of death were hospitalized in the psychiatry unit, and the attempts caused by secondary gain were discharged from the ED. Patients who had taken paracetamol for suicide, which is contain 70.10% of the total cases, were discharged from the ED, after the examination. It was detected that 39.29% of the cases who had Suicidal ideations again, had a psychiatric disease in their medical history. Conclusions: Suicidal behavior is a very comprehensive topic when considering its etiology and risk factors, there are many variables as well. Since it is one of the serious public health issues and causes of death, the risk factors must be identified and preventions to be taken should be determined. In addition, when elderly people attempt suicide, more medical care should be taken during ED, since they are more focused to die and fall into the category of severe cases.
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- 2022
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6. İntörn Hemşirelere Verilen Akılcı İlaç Uygulamaları Eğitiminin İlaç Uygulamaları ile İlgili Tıbbi Hata Eğilimlerine Etkisi
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Derya Suluhan, Emine Öksüz, Gamze Sarıkoç, Sibel Yılmaz Şahin, Hatice Ayhan, Gülşah Kök, Tülay Başak, Dilek Yıldız, Gülden Güvenç, Öznur Kavaklı, and Emine İyigün
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akılcı ilaç kullanımı ,eğitim ,hemşirelik öğrencileri ,tıbbi hatalar ,education ,medical errors ,nursing students ,rational use of medicines ,Nursing ,RT1-120 - Abstract
Giriş: Hemşireler, tıbbi hatalarının önlenmesinde ve hasta güvenliğinin sağlanmasında önemli bir role sahiptirler. Bu nedenle hemşirelerin lisans eğitimi sırasında hasta güvenliği uygulamalarına yönelik bilgi, beceri ve tutum kazanmaları beklenmektedir. Bu uygulamalardan biri akılcı ilaç kullanımıdır.Amaç: Bu araştırmanın amacı; intörn hemşirelere verilen akılcı ilaç uygulamaları eğitiminin öğrencilerin tıbbi hataya eğilimleri üzerine etkisini incelemektir.Yöntem: Bu araştırma tek merkezli, yarı deneysel bir çalışma olup, Ankara’da bir hemşirelik yüksekokulunda yürütüldü. Araştırmanın örneklemini 97 intörn hemşire oluşturdu. Okulun intörn oryantasyon programı içerisinde yer alan “Akılcı İlaç Uygulamaları Eğitimi” orta gerçeklik simülasyon uygulamalarından biri olan rol play yöntemi ile verildi. Simülasyon eğitiminin etkinliği, Öğrenmede Öğrenci Memnuniyeti ve Özgüven Ölçeği ile değerlendirildi. Akılcı ilaç uygulama eğitiminin, öğrencilerin ilaç uygulamalarıyla ilişkili tıbbi hata eğilimlerine etkisini incelemek için ise, Hemşirelikte Tıbbi Hataya Eğilim Ölçeği'nin İletişim ile İlaç ve Transfüzyon Uygulamaları alt ölçekleri kullanıldı.Bulgular: Araştırmada yer alan öğrencilerin yaş ortalamaları 22±0,14’tür. Simülasyon eğitimi sonrası öğrencilerin hem Şimdiki Öğrenme ile İlgili Memnuniyet puan ortalamasının (4,40±0,53), hem de Öğrenmede Özgüven puan ortalamasının (4,32±0,50) oldukça yüksek olduğu saptandı. Öğrencilerin tıbbi hata eğilimlerinin ise düşük olduğu ve eğitimden altı ay sonra da değişmediği belirlendi (p gt;0,05).Sonuç: Bu çalışmada, intörn hemşirelerin tıbbi hata eğilimlerinin düşük düzeyde olduğu ve zamana göre değişmediği değerlendirilmektedir. Çalışma aynı zamanda akılcı ilaç kullanımı eğitiminin ve eğitimde süreklilik anlayışının etkinliğini göstermektedir.
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- 2020
7. Boron-rich diet may regulate blood lipid profile and prevent obesity: A non-drug and self-controlled clinical trial
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Kuru, Ruya, Yilmaz, Sahin, Balan, Gulsah, Tuzuner, Burcin Alev, Tasli, Pakize Neslihan, Akyuz, Serap, Yener Ozturk, Feyza, Altuntas, Yuksel, Yarat, Aysen, and Sahin, Fikrettin
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- 2019
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8. Cerrahi ve İç Hastalıkları Hemşireliği Eğitimi Kapsamında Yürütülen Simülasyon Uygulamalarına Yönelik Öğrenci Görüşlerinin Değerlendirilmesi
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Yasemin Özkan, Hatice Ayhan, Özgü Bakçek, Gülfaden Akkoç, Serpil Ateş, Rumeysa Özçelik, Fatma İlknur Çınar, Sibel Yılmaz Şahin, Ayla Demirtaş, Emel Külekçi, and Emine İyigün
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hemşirelik eğitimi ,memnuniyet ,özgüven ,simülasyon ,nursing education ,satisfaction ,self-confidence ,simulation ,Nursing ,RT1-120 - Abstract
Giriş:Hemşirelikeğitiminde simülasyon kullanımının amacı, klinik gerçekliği taklit ederek ve öğrenciyiaktif kılarak öğrenim sürecini kolaylaştırmaktır. Simülasyon, psikomotorbecerinin yanı sıra, kognitif becerilerin kullanılmasına ve geliştirilmesine dekatkıda bulunmaktadır. Ülkemizde Cerrahi ve İç Hastalıkları Hemşireliğialanında simülasyon kullanımının sonuçlarını inceleyen sınırlı sayıda çalışmabulunmaktadır.Amaç:Araştırma,Cerrahi ve İç Hastalıkları Hemşireliği dersi kapsamında yürütülen simülasyon uygulamalarınailişkin öğrencilerin görüşlerini ve öğrenme sürecine ilişkin memnuniyet/özgüvendüzeylerini incelemek amacıyla gerçekleştirildi.Yöntem:Retrospektifve tanımlayıcı nitelikteki bu çalışma, Ankara’da bir hemşirelik fakültesinde2018-2019 Eğitim-Öğretim yılında öğrenim gören, toplam 115 ikinci sınıföğrencisiyle yürütüldü. Öğrenciler beşer kişilik gruplara ayrıldı ve her grup10 farklı simülasyon uygulamasına katıldı. Verilerin toplanmasında SimülasyonTasarım Ölçeği ve Öğrenmede Öğrenci Memnuniyeti ve Özgüven Ölçeği kullanıldı. Bulgular:Öğrencilerinuygulanan simülasyonun tasarımı hakkındaki görüşleri incelendiğinde; SimülasyonTasarım Özelliklerinin Uygunluğu (4,53 ± 0,47) ve Simülasyon TasarımÖzelliklerinin Öğrenciye Göre Önemi’ne (4,67 ± 0,41) ilişkin toplam puanortalamalarının oldukça yüksek olduğu bulundu. Öğrencilerin simülasyonuygulamalarına ilişkin öğrenmede memnuniyet ve özgüven puan ortalamalarının dayüksek olduğu değerlendirildi. Simülasyon Tasarım Ölçeği ile Öğrenmede ÖğrenciMemnuniyeti ve Özgüven Ölçeği arasında da pozitif yönde anlamlı bir ilişkiolduğu (r=0,717, p lt;0,001; r=0,747, p lt;0,001) saptandı.Sonuç:ÖğrencilerinCerrahi ve İç Hastalıkları Hemşireliği dersi kapsamında yürütülen simülasyon uygulamalarındançok memnun olduğu ve uygulamanın bu konuya ilişkin özgüvenlerini artırdığı görüldü.Bu dersler kapsamında, özellikle klinik uygulama öncesi öğrencilerin hempsikomotor becerilerini hem de kognitif becerilerini kullanmalarına vegeliştirmelerine olanak tanıyacak, çeşitli senaryolarla zenginleştirilmişsimülasyon uygulamalarına yer verilmesi yararlı olacaktır.
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- 2019
9. Effect of acupressure application to the P6 acupoint before laparoscopic cholecystectomy on postoperative nausea-vomiting: A randomized controlled clinical study
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Yilmaz Sahin, Sibel, Iyigun, Emine, and Can, Mehmet Fatih
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- 2018
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10. Middle Permian–early Triassic magmatism in the Western Pontides, NW Turkey: Geodynamic significance for the evolution of the Paleo-Tethys
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Aysal, Namık, Yılmaz Şahin, Sabah, Güngör, Yıldırım, Peytcheva, Irena, and Öngen, Sinan
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- 2018
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11. Study of the boron levels in serum after implantation of different ratios nano-hexagonal boron nitride–hydroxy apatite in rat femurs
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Atila, Alptug, Halici, Zekai, Cadirci, Elif, Karakus, Emre, Palabiyik, Saziye Sezin, Ay, Nuran, Bakan, Feray, and Yilmaz, Sahin
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- 2016
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12. Clinical Characteristics and in-Hospital Outcomes of Patients Undergoing Left Atrial Appendage Closure
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Zeren, Gönül, primary, Can, Fatma, additional, Sungur, Mustafa Azmi, additional, Yılmaz, Şahin, additional, and Karabay, Can Yücel, additional
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- 2023
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13. Assessing Thirst Symptom of Patients Undergoing Abdominal Surgery: A Scale Development Study
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Bediye Öztaş, Muharrem Öztaş, Sibel Yılmaz Şahin, Emine İyigün, and Ümit Alkuş
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- 2022
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14. The Awareness of Elderly about Osteoporosis: What about Our Elderly?
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Zuhal Özişler, Sibel Ünsal Delialioğlu, Sumru Özel, Şule Şahin Onat, Alize Yılmaz Şahin, and Melike Dolmuş
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Osteoporosis ,elderly ,awareness ,education ,Medicine ,Other systems of medicine ,RZ201-999 - Abstract
Objective: Osteoporosis (OP) and bone fractures that can result in pain, functional impairment and death are important public health problems for the elderly. The aim of our study was to asses the awareness and the information level about OP in the elderly. Materials and Methods: A total of 250 participants (203 were women, 47 were men) who were 65 years and older who presented to our outpatient clinic were included the study. Demographic data were recorded. A 26 item questionnaire was used in the assessment of information on the OP risk factors in 220 (88%) cases who reported that they are aware about OP. Questionnaires were filled with face-toface interview. Results: There was no significant difference between gender and age groups (
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- 2015
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15. Geochemistry and U–Pb zircon geochronology of metagranites in Istranca (Strandja) Zone, NW Pontides, Turkey: Implications for the geodynamic evolution of Cadomian orogeny
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Yilmaz Şahin, Sabah, Aysal, Namık, Güngör, Yıldırım, Peytcheva, Irena, and Neubauer, Franz
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- 2014
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16. Validation of Recognition of Stroke in the Emergency Room scale in Turkish population and comparison of its efficiency with Face-Arm-Speech Test
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Ahmet Celik, Burak Demirci, Mehmet Okumuş, İsa Başpinar, and Nurdan Yılmaz Şahin
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Emergency Medical Services ,medicine.medical_specialty ,Turkish population ,Neurology ,business.industry ,Medical assistant ,Test validity ,Emergency department ,Critical Care and Intensive Care Medicine ,medicine.disease ,Test (assessment) ,Scale (social sciences) ,Emergency medicine ,Emergency Medicine ,medicine ,business ,Stroke - Abstract
BACKGROUND: Various risk scores were developed to recognize acute stroke easily and to start treatment right away in the emergency departments. Although the Recognition of Stroke in the Emergency Room (ROSIER) score used for this purpose is indicated better than the other scoring systems, it is expressed that it will be able to have social differentiations. In this study, we targeted to research validation of the ROSIER scale and to compare its efficiency with Face-Arm-Speech Test (FAST), another stroke diagnosis method, for the patients who applied to the emergency department with the stroke or transient ischemic attack symptoms. MATERIAL AND METHODS: The patients who reported to the emergency department with the suggestive symptoms or findings of stroke and were above 18 years of age were included in the study. The study forms were filled out by the emergency medicine specialist or the senior emergency medical assistant after the patients were evaluated, and then they were consulted by the neurology specialist. The final diagnosis, which was established after the clinical evaluation and necessary imaging done by the neurology specialists, was accepted as a standard reference. RESULTS: A total of 335 patients, including 168 (50.1%) females, were included in the study. The sensitivity was 68.5%, specificity was 79.0%, Positive Predictive Value (PPV) was 78.7%, NPV (Negative Predictive Value) was 68.9%, and test validity was 73.4% for the ROSIER scale. For the FAST scale the sensitivity was 63.5%, specificity was 88.5%, PPV was 86.3%, NPV was 68.1%, and test validity was 75.2%. CONCLUSION: In the present study, it was seen that the ROSIER scale could be used in separating the patients with CVO (cerebrovascular accident) from the patients who applied with the similar clinical findings. However, FAST was superior because its specificity and PPV were higher and its practicability was easier than the ROSIER.
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- 2021
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17. The Effect of Anesthesia Type Applied in Transcatheter Aortic Valve Implantation.
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Yılmaz, Şahin, Zeren, Gönül, Avcı, İlhan İlker, Sungur, Mustafa Azmi, Can, Fatma, Yılmaz, Mehmet Fatih, Şimşek, Barış, Tezen, Ozan, and Karabay, Can Yücel
- Abstract
Copyright of Archives of the Turkish Society of Cardiology / Türk Kardiyoloji Derneği Arşivi is the property of KARE Publishing and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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- 2023
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18. Examination of Intrinsic and Extrinsic Motivation of Women Football Players in Turkey and Portugal Sample
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Erdi Kaya and Yılmaz Şahin
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General Energy ,Psychology - Abstract
Araştırmamızın amacı kadın futbolcularının içsel ve dışsal motivasyon tutumlarını bazı değişkenler açısından incelemektir. Araştırmada nicel araştırma yöntemi uygulanmıştır. Araştırmanın evrenini, Türkiye’nin Akdeniz ve Portekiz’deki Porto bölgelerinde, 2019-2020 sezonunda oynayan amatör, yarı profesyonel ve profesyonel kadın futbolcular oluşturmaktadır. Araştırmanın örneklemi tesadüfi örneklem yöntemi ile belirlenmiştir ve araştırmaya 205 kadın futbolcu katılmıştır. Yapılan araştırmada, araştırma sahibi tarafından oluşturulmuş kişisel bilgi formu (Türkçe, Portekizce ve İngilizce dillerinde) kullanılmıştır. Ayrıca, İngilizce olarak, Pelletier ve ark. (1995) tarafından geliştirilen Sport Motivation Scale (SMS), Türk sporcular için Kazak (2004) tarafından geçerlik güvenirliği yapılan Sporda Güdülenme Ölçeği (SGÖ) ve Portekiz'li sporcular için uyarlanması Bara Filho ve ark. (2011) tarafından yapılan Escala de Motivação Desportiva (EME-BR) olmak üzere üç farklı dilde ölçekler kullanılmıştır. Elde edilen verilen SPSS 22 paket programı ile analiz edilmiştir. Mann Whitney U testi, Kruskal Wallis H testi ve Spearman Korelasyon analizi uygulanmıştır. Sporda Güdülenme Ölçeği alt boyutları lig değişkenine göre incelendiğinde, Portekiz’de futbol oynayan kadın sporcularının güdülenme düzeyleri Türkiye'deki kadın sporculardan anlamlı derecede yüksek olduğu görülmüştür (p
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- 2021
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19. Examination of characteristic parameters of Zn/n-Si junction depending on electron radiation applied at different doses
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Betül Güzeldir, Maryam Abdolahpour Salari, Mustafa Sağlam, and Yılmaz Şahin
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Crystal ,Rectifier ,Materials science ,Alloy ,engineering ,Analytical chemistry ,Schottky diode ,Voltage source ,Sputter deposition ,engineering.material ,Ohmic contact ,Diode - Abstract
In this work, we have studied the electrical characteristics of Zn/n-Si/Au-Sb Schottky diodes before and after different doses (25, 50 and 75 Gray) of electron-irradiation at room temperature. The ohmic contact has been made on n-Si crystal with Au-Sb alloy. The rectifier contact was sputtered Zinc metal on n-Si by using DC magnetron sputtering. The I–V measurements of these diodes performed by the use of a KEITLEY 487 Picoammeter/Voltage Source and the C–V measurements were performed with HP 4192A (50–13 MHz) LF Impedance Analyzer at room temperature and in dark. Experimental results showed that the values of the ideality factor obtained from I to V measurements increased and the values of the barrier height obtained from I to V and C–V measurements decreased after electron-irradiation.
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- 2021
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20. Comparison of Gonadotropin with Gonadotropin and Letrozole Combination in Infertile Women with Biopsy - Proven Endometriosis Undergoing Intracytoplasmic Sperm Injection
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Burak Tanır, Mehmet Serdar Kütük, Mehmet Dolanbay, Mahmut Tuncay Özgün, Semih Uludağ, Ercan Aygen, and Yılmaz Şahin
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Infertility, Endometriosis, ICSI, Letrozole, Gonadotropin ,Gynecology and obstetrics ,RG1-991 - Abstract
OBJECTIVE: To compare the result of intracytoplasmic sperm injection cycles using gonadotrophins with those of using gonadotrophins combined with letrozole in infertile woman with biopsy-proven endometriosis. STUDY DESIGN: This prospective randomized study was performed at the department of Obstetrics and Gynecology Reproductive Center, in Erciyes University. Thirty- three women undergoing intracytoplasmic sperm injection (ICSI) with gonadotropin or combination of gonadotropin with letrozole were accepted. The patients were grouped as: gonadotropin group (Group 1), and gonadotropin plus letrozole (Group 2). Total and clinical pregnancy ratios, length of cycles, and doses of gonadotropin used were compared. RESULTS: Total doses of gonadotrophins used in group 1, and group 2 were 2700 (1800- 3600) IU and 2100 (1575- 3475) IU, respectively. Total dose of gonadotropin used in group 2 was found to be lower than that of group one and this difference was statistically significant (p= 0.002). Stimulation times in group 1 and 2 were 10 (9- 12) day, and (7- 12) day, respectively, and the difference was statistically significant (p=0.048). Number of the retrieved oocytes were higher in group 2 than Group 1(p=0.027). There was no statistically significant difference between groups with regard to numbers of embryos, total and clinical pregnancy ratio. CONCLUSIONS: Letrozole has no effect on the results of ICSI success in infertile women with biopsy proven- endometriosis. However, it reduces the gonadotropin dose used, stimulation time and, cost of the therapy.
- Published
- 2016
21. Enhanced Electrical and Optical Characteristics of Co/Phenol Red (PR)/Silicon Hybrid Heterojunction for Photodiode and Thermal Applications
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Hatice Kacus, Ümit Incekara, Sakir Aydogan, Yılmaz Şahin, and Mehmet Yilmaz
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Materials science ,Solid-state physics ,Silicon ,chemistry.chemical_element ,Thermionic emission ,02 engineering and technology ,01 natural sciences ,law.invention ,chemistry.chemical_compound ,law ,0103 physical sciences ,Materials Chemistry ,Electrical and Electronic Engineering ,010302 applied physics ,Phenol red ,Equivalent series resistance ,business.industry ,Heterojunction ,Atmospheric temperature range ,021001 nanoscience & nanotechnology ,Condensed Matter Physics ,Electronic, Optical and Magnetic Materials ,Photodiode ,chemistry ,Optoelectronics ,0210 nano-technology ,business - Abstract
A Co/phenol red (PR)/n-Si/Al device has been fabricated and its current–voltage (I–V) characteristics measured between 80 K and 460 K. Junction parameters of the device, such as the ideality factor, barrier height, interface state density, and series resistance (Rs), were determined using standard thermionic emission theory, the Cheung function, and the Norde method. The application of these approaches revealed that n varied between 4.66 and 1.70 in the temperature range of 80 K to 460 K, while Φb varied between 0.24 eV and 0.83 eV in the same temperature range. These variations of n and Φb can be attributed to the barrier height inhomogeneity in the device. Although PR is generally used in biological applications such as cell culture, it has been observed that such Co/phenol red/n-Si/Al devices may be critical candidates for use in thermal sensors and photodiode applications due to their photoresponse and low-temperature operation for reverse-bias I–V measurements. Furthermore, PR is an alternative to semiconductor materials commonly used in such applications.
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- 2020
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22. Co/aniline blue/silicon sandwich hybrid heterojunction for photodiode and low-temperature applications
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Ümit Incekara, Hatice Kacus, Mehmet Yilmaz, Sakir Aydogan, and Yılmaz Şahin
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Materials science ,Silicon ,business.industry ,020502 materials ,Mechanical Engineering ,chemistry.chemical_element ,Heterojunction ,02 engineering and technology ,Photodiode ,law.invention ,0205 materials engineering ,chemistry ,Mechanics of Materials ,law ,Ceramics and Composites ,Optoelectronics ,business - Abstract
The temperature dependence of the current–voltage and room temperature capacitance–voltage measurements of Co/aniline blue/ n-Si sandwich-type rectifying device was investigated.Furthermore, the effects of the illumination on the current–voltage measurements were tested with 100 mW/cm2 light intensity, and it was seen that Co/aniline blue/ n-Si sandwich-type device showed a clear response to illumination, and it may be a candidate for solar cells or photodiode applications. The rectifying device parameters, such as the barrier height (Ф), the ideality factor ( n), the rectification ratio, and the series resistance ( Rs), were obtained as a function of temperature using thermionic emission, Cheung function, and Norde function. The interface state densities versus energy were obtained. The Richardson constant ( A*) obtained from the In( Io/ T2) versus 1000/ T plot was much less than the theoretical value for n-Si. The mean Schottky barrier height[Formula: see text] and the standard deviation ( σo) were calculated using the apparent Schottky barrier height Фap versus 1/2 kT plot. So, it has been found to be 1.08 eV and 0.15 V (260–460 K) and 0.79 eV and 0.10 V (100–260 K), respectively. The results were discussed based on the presence of two Gaussian distributions of Фb potential in the contact area of Co/aniline blue/ n-Si/Al device.
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- 2020
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23. The role of Yemen in Iran’s security policy: A historical and sectarian evaluation
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Yılmaz Şahin , Türel and Kocatepe, Damla
- Subjects
Houthis ,Iran-Yemen Relations ,Husiler ,Zaidiyyah ,Zeydilik ,The Security Policy of Iran ,İran’ın Güvenlik Politikası ,Bab el- Mandeb Strait ,İran-Yemen İlişkileri ,Bab’ül Mendep Boğazı - Abstract
Orta Doğu’daki en önemli devletlerden biri olan İran, tarihsel kaygıları ve ekonomik çıkarlarını bir araya getirerek dış politikasını şekillendirmektedir. Kuşatılma sendromunun etkisiyle güvenliğini sınırları dışından başlatmayı arzularken ideolojik veya mezhepsel yakınlık duyduğu grupları da yanına çekmek istemektedir. Yemen’de Husiler üzerinden denetim sağlamayı amaçlayan İran, bir yandan Bab’ül Mendep Boğazı’nı kontrol altında tutarak enerji güvenliğini sağlamaya çalışmakta diğer yandan Sünniliğin önemli bir temsilcisi olan Suudi Arabistan’ı devre dışı bırakmak istemektedir. İran’ın güvenlik politikalarında Yemen’in rolünü irdelemek isteyen bu çalışmada; Yemen’in stratejik konumu ve önemi, Husiler ve İran’la ilişkileri, İran’ın güvenlik politikalarında Şiilik ve son olarak Suudi Arabistan-İran rekabetinin Yemen’deki yansımaları tartışılacaktır. Iran, one of the most important states in the Middle East, shapes its foreign policy by bringing together historical concerns and economic interests. While it wants to initiate its security from outside the borders by the influence of the siege syndrome/siege mentality it also wants to gain groups which is close to its ideological or sectarian identity. Aiming to provide control over the Houthis in Yemen, Iran is trying to maintain energy security by controlling Bab el-Mandeb Strait and neutralize the Saudi Arabia, an important representative of Sunni. This study discusses the strategic importance of Yemen, the relations between the Houthis and Iran, Shi’ism in Iran’s security policies and finally the reflections of the Saudi Arabia-Iranian rivalry in Yemen while aiming to analyze the role of Yemen in Iran’s security policies
- Published
- 2022
24. View of philosophers in Ta'wilat Al-Qur'an
- Author
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Yılmaz, Şahin, Öğmüş, Harun, and NEÜ, Sosyal Bilimler Enstitüsü, Temel İslam Bilimleri Anabilim Dalı
- Subjects
Seneviyye ,Ta’wilat al-Qur’an ,Sudûr Nazariyesi ,Dahriyya ,Te'vîlâtü'l-Kur'ân ,Dehriyye ,Theory of Emanation ,Mâtürîdî ,al-Maturidi ,Seneviyya - Abstract
Yüksek Lisans Tezi, Müslümanlar Arap yarımadasının dışında fetihler gerçekleştirmeye başladıkları andan itibaren farklı dini ve felsefî akımlarla görüşleri ile karşı karşıya kalmıştır. Bu farklı akımlar karşısında varlıklarını sürdürmek ve fethettikleri bölgelerde kalıcılıklarını sağlamak için bu akımların fikirlerini öğrenip, onlara karşı tez üretmek durumunda kalan Müslümanlar bu akımların eserlerinin birçoğunu tercüme etmişlerdir. İlk başlarda matematik, fizik, tıp gibi alanlarla sınırlı olan çeviri faliyetleri ilerleyen süreçte bu akımların fikri altyapısını öğrenmek ve onlara karşı cevaplar üretmek için felsefe ve düşünce sistemlerini açıklayan kitaplar olarak devam etmiştir. İmam Mâtürîdî’nin yaşadığı bölge olan Semerkant, dünyanın önemli ticaret noktalarından birisi olması sebebiyle bu farklı akımların bol miktarda bulunduğu bir bölgedir. Bölgede ki bu çeşitlilik İmam Mâtürîdî’nin düşünce hayatına da yansımış ve tefsirini tefsir tarihinin özgün bir parçası yapmıştır. Kendisinden önceki tefsirlerden farklı olarak dönemin önemli felsefî akımları olan (Dehriyye, Seneviyye gibi akımlara ve sudûr nazariyesine tefsirinde bolca yer veren İmam Mâtürîdî, Kitâbü’t-Tevhîd’de bu akımlara dair yaptığı eleştirileri tefsirine yansıtmıştır. Biz bu çalışmamız da İmam Mâtürîdî’nin filozoflara dair bakış açısını Te'vîlâtü'l-Kur'ân üzerinden ortaya koymaya çalıştık., Muslims have been confronted with the views of different religions and movements from the moment they started to make conquests outside the Arabian Peninsula. To maintain their existence in the face of these different fictional trends and to ensure their permanence in the regions they conquered, Muslims who had to learn the ideas of these fictional trends and produce thesis against them translated many of the works of these trends. Translation activities, which were initially limited to fields such as mathematics, physics, and medicine, continued with books on subjects like philosophy and thought systems to explain the intellectual infrastructure of these fictional trends and in order to produce answers against them. Samarkand, the region where Imam Maturidi lived, is a region where these different movements are abundant, as it is one of the significant trade points of the world. This diversity in the region was also reflected in the intellectual life of Imam Maturidi and made his tafsir an original part of the history of tafsir. Different from the tafsirs before him, Imam Maturidi gave an extensive elaboration on the views of the significant movements of the period (Dahriyyah, Sanawiyyah, Sudur Theory) in his tafsir. In this research, we tried to reveal the point of view of Imam Maturidi on the philosophers through the Te'vilatu'l-Qur'an.
- Published
- 2022
25. The A rare and endemic species expanded to Northern Anatolia: Grypocoris syriacusReuter, 1896 (Hem., Het., Miridae)
- Author
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KIYAK, Suat and Yılmaz Şahin, Şeyma
- Subjects
Grypocoris syriacus Reuter 1896 ,Hemiptera ,Turkey ,rare endemic species - Abstract
In this paper, new record distributional data on a rare Heteroptera (Hemiptera) species, Grypocoris syriacus Reuter, 1896 from northern Anatolia (Gerede district, Bolu province) are given.
- Published
- 2021
26. Validation of Recognition of Stroke in the Emergency Room scale in Turkish population and comparison of its efficiency with Face-Arm-Speech Test
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Yılmaz Şahin, Nurdan, primary, Okumuş, Mehmet, additional, Baspınar, Isa, additional, Demirci, Burak, additional, and Çelik, Ahmet, additional
- Published
- 2021
- Full Text
- View/download PDF
27. The light detection performance of the congo red dye in a Schottky type photodiode
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Adem Kocyigit, Mehmet Yılmaz, Ümit İncekara, Yılmaz Şahin, and Şakir Aydoğan
- Subjects
General Physics and Astronomy ,Physical and Theoretical Chemistry - Published
- 2022
- Full Text
- View/download PDF
28. Geochemistry of mafic microgranular enclaves in the Tamdere Quartz Monzonite, south of Dereli/Giresun, Eastern Pontides, Turkey
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Yilmaz Şahin, Sabah
- Published
- 2008
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29. Sağlık Bilimlerinde İlk Yardım ve Uygulamaları
- Author
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Sevgi Deniz Doğan, Sibel Yılmaz Şahin, Nursevim Aydıngülü, Zeliha Özdemir Köken, Yeşim Yaman Aktaş, Sevban Arslan, Sevilay Erden, Pınar Kaya, Zuhal Erdogan, İlknur Tura, Muaz Gülşen, and Ali Ay
- Abstract
Dogru ve hizli ilkyardim uygulamalari, sekelsiz sagkalim oranlarini %50’ye kadar arttirabilir. Bu baglamda, sagkalimda, etkili ilkyardimin onemini vurgulayan ve saglik profesyonellerinde bu farkindaligi arttiran guncel kaynaklara ihtiyac vardir. Bu kitapta, ilkyardimin temel ilke ve uygulamalari, temel ve ileri yasam destegi, tibbi acil durumlarda ve diger acil durumlarda ilkyardim ve kanita dayali uygulamalar gibi konular uluslararasi 2020 ilkyardim rehberleri cercevesinde uzmanlar tarafindan ele alinmistir.
- Published
- 2021
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- View/download PDF
30. Influence of illumination intensity on electrical characteristics of Eosin y dye-based hybrid photodiode: comparative study
- Author
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Mehmet Yilmaz, Hatice Kacus, Yılmaz Şahin, Adem Kocyigit, Sakir Aydogan, and Ümit Incekara
- Subjects
010302 applied physics ,Photocurrent ,Materials science ,Silicon ,business.industry ,Capacitive sensing ,chemistry.chemical_element ,02 engineering and technology ,General Chemistry ,021001 nanoscience & nanotechnology ,01 natural sciences ,Photodiode ,law.invention ,chemistry.chemical_compound ,chemistry ,law ,0103 physical sciences ,Optoelectronics ,General Materials Science ,Electrical measurements ,Thin film ,0210 nano-technology ,business ,Eosin Y ,Dark current - Abstract
We reported the optoelectronic performance of organic/inorganic hybrid junction photodiode based on Eosin y/silicon (Si). For this purpose, we fabricated Eosin y/n-Si and Eosin y/p-Si structures and demonstrated that both devices exhibited strong photodiode characteristics to the increasing light power depending on current–voltage (I–V) measurements. Furthermore, the XRD and SEM analyses of Eosin y film were performed to analyze structural and topographical features of the film. The electrical measurements of Eosin y/n-Si and Eosin y/p-Si photodiodes were carried out in both dark and under various illumination intensities in the range of 100–400 mW/cm2. The main device parameters, such as ideality factor, barrier height, and responsivities of both devices, were determined from the I–V characteristics. The obtained photocurrent values in reverse biases are higher than the dark current at the same reverse bias for both Eosin y/n-Si and Eosin y/p-Si photodiodes. So, this confirmed that light produces photocurrent due to the formation of electron–hole pairs as a result of light absorption in the Eosin y film. Moreover, the C–V measurements were performed on both photodiodes to characterize capacitive performance of the Eosin y films. The fabricated photodiodes based on Eosin y thin films present great promise for future optoelectronic device applications.
- Published
- 2020
- Full Text
- View/download PDF
31. The effects of electron irradiation on the current-voltage and capacitance-voltage measurements of Sn/p-GaAs/Au diodes
- Author
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Songül Duman, Fikriye Şeyma Kaya, Hülya Doğan, Güven Turgut, Yılmaz Şahin, and Mühendislik Fakültesi
- Subjects
Radiation ,GaAS Diode Electron irradiation Seri resistance Barrier height III-V semiconductor - Abstract
vdshjlfüğüvnnngm
- Published
- 2022
- Full Text
- View/download PDF
32. Transkateter Aort Kapak İmplantasyonu Sırasında Profilaktik İpsilateral Distal Femoral Arter Kanülasyonunun Periprosedürel Periferik Komplikasyonları Önlemedeki Yeri.
- Author
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İlker Avcı, İlhan, Zeren, Gönül, Azmi Sungur, Mustafa, Şimşek, Barış, Can, Fatma, Fatih Yılmaz, Mehmet, Yılmaz, Şahin, Gürkan, Ufuk, and Yücel Karabay, Can
- Abstract
Copyright of Archives of the Turkish Society of Cardiology / Türk Kardiyoloji Derneği Arşivi is the property of KARE Publishing and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
- Published
- 2022
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33. A Case of Atraumatic Splenic Rupture in Twin Pregnancy
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Akın Sivaslıoğlu, Berfu Demir, Orhan Gelişen, Serdar Dilbaz, Yılmaz Şahin, and İsmail Dölen
- Subjects
Atraumatic splenic rupture, pregnancy ,Gynecology and obstetrics ,RG1-991 - Abstract
A 31 year old woman with 34 weeks of twin pregnancy underwent caserean section for fetal distres. Before the uterine incision, hemoperitoneum was observed and splenic rupture was detected when the origin of the bleeding was sought and primary repair was performed using compression sutures. As splenic rupture is a rare complication that is encountered during pregnancy, there might be a delay in diagnosis but emergency intervention is essential as haemorrhagic shock can easily develop in a short time.
- Published
- 2006
34. Genomic, transcriptomic and physiological analyses of silver‐resistantSaccharomyces cerevisiaeobtained by evolutionary engineering
- Author
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Terzioğlu, Ergi, primary, Alkım, Ceren, additional, Arslan, Mevlüt, additional, Balaban, Berrak Gülçin, additional, Holyavkin, Can, additional, Kısakesen, Halil İbrahim, additional, Topaloğlu, Alican, additional, Yılmaz Şahin, Ülkü, additional, Gündüz Işık, Sema, additional, Akman, Süleyman, additional, and Çakar, Zeynep Petek, additional
- Published
- 2020
- Full Text
- View/download PDF
35. Ekonomi, yönetim ve pazarlama alanında akademik araştırmalar
- Author
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editor Dr. Öğr. Üyesi Hasan Selçuk Eti, yazarlar Burcu Yılmaz Şahin, Derya Hekim, Gülnur Eti İçli, Gündem Gündüz Erdinç, Mehmet Kuzu, Mehmet Orhan, Meltem Üzüm, Müslime Sözen, Sadık Kocabaş, Salih Dinçel, Selçuk Gürçam, Selma Öner, Serpil Türkyılmaz, Teoman Akpınar, Ebru Sönmez Karapınar, Yunus Dursun, editor Dr. Öğr. Üyesi Hasan Selçuk Eti, yazarlar Burcu Yılmaz Şahin, Derya Hekim, Gülnur Eti İçli, Gündem Gündüz Erdinç, Mehmet Kuzu, Mehmet Orhan, Meltem Üzüm, Müslime Sözen, Sadık Kocabaş, Salih Dinçel, Selçuk Gürçam, Selma Öner, Serpil Türkyılmaz, Teoman Akpınar, Ebru Sönmez Karapınar, and Yunus Dursun
- Published
- 2021
36. Academic Reseach in Life Sciences for Sustainibility
- Author
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editor Assoc. Prof. Gökhan Çaylı, Writers Burcu Yılmaz Şahin, Derya Hekim, Mehmet Kuzu, Merve Çetin Dağdelen, Müslime Sözen, Sadık Kocabaş, Salih Dinçel, Selçuk Gürçam, Selma Öner, Serpil Türkyılmaz, editor Assoc. Prof. Gökhan Çaylı, Writers Burcu Yılmaz Şahin, Derya Hekim, Mehmet Kuzu, Merve Çetin Dağdelen, Müslime Sözen, Sadık Kocabaş, Salih Dinçel, Selçuk Gürçam, Selma Öner, and Serpil Türkyılmaz
- Published
- 2021
37. Genomic, transcriptomic and physiological analyses of silver‐resistant Saccharomyces cerevisiae obtained by evolutionary engineering
- Author
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Can Holyavkin, Zeynep Petek Çakar, Ülkü Yılmaz Şahin, Ceren Alkim, Sema Gündüz Işık, Ergi Terzioğlu, Halil İbrahim Kısakesen, Alican Topaloğlu, Mevlüt Arslan, Berrak Gülçin Balaban, Suleyman Akman, Istanbul Technical University (ITÜ), Toulouse Biotechnology Institute (TBI), Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE), Toulouse White Biotechnology (TWB), Yüzüncü Yıl University, Scientific and Technological Research Council of Turkey (TuBTAK) (project no: 109T638), COST Action (CM0902) project, and Institut National des Sciences Appliquées (INSA)-Université de Toulouse (UT)-Institut National des Sciences Appliquées (INSA)-Université de Toulouse (UT)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)
- Subjects
0106 biological sciences ,Saccharomyces cerevisiae Proteins ,Silver ,Cellular respiration ,Mutant ,Saccharomyces cerevisiae ,Mutation, Missense ,Bioengineering ,Biology ,01 natural sciences ,Applied Microbiology and Biotechnology ,Biochemistry ,Transcriptome ,evolutionary engineering ,03 medical and health sciences ,Drug Resistance, Fungal ,Stress, Physiological ,010608 biotechnology ,[SDV.BBM.GTP]Life Sciences [q-bio]/Biochemistry, Molecular Biology/Genomics [q-bio.GN] ,Genetics ,silver resistance ,Gene ,Transcription factor ,030304 developmental biology ,adaptive laboratory evolution ,stress resistance ,0303 health sciences ,Gene Expression Profiling ,Genomics ,biology.organism_classification ,Yeast ,Cell biology ,Vesicular transport protein ,whole-genome sequencing ,Directed Molecular Evolution ,Biotechnology - Abstract
International audience; Silver is a non-essential metal used in medical applications as an antimicrobial agent, but it is also toxic for biological systems. To investigate the molecular basis of silver resistance in yeast, we employed evolutionary engineering using successive batch cultures at gradually increased silver stress levels up to 0.25-mM AgNO(3)in 29 populations and obtained highly silver-resistant and genetically stableSaccharomyces cerevisiaestrains. Cross-resistance analysis results indicated that the silver-resistant mutants also gained resistance against copper and oxidative stress. Growth physiological analysis results revealed that the highly silver-resistant evolved strain 2E was not significantly inhibited by silver stress, unlike the reference strain. Genomic and transcriptomic analysis results revealed that there were mutations and/or significant changes in the expression levels of the genes involved in cell wall integrity, cellular respiration, oxidative metabolism, copper homeostasis, endocytosis and vesicular transport activities. Particularly the missense mutation in theRLM1gene encoding a transcription factor involved in the maintenance of cell wall integrity and with 707 potential gene targets might have a key role in the high silver resistance of 2E, along with its improved cell wall integrity, as confirmed by the lyticase sensitivity assay results. In conclusion, the comparative physiological, transcriptomic and genomic analysis results of the silver-resistantS. cerevisiaestrain revealed potential key factors that will help understand the complex molecular mechanisms of silver resistance in yeast.
- Published
- 2020
- Full Text
- View/download PDF
38. The performance of chitosan layer in Au/n-Si sandwich structures as a barrier modifier
- Author
-
Mehmet Yilmaz, Sakir Aydogan, Yılmaz Şahin, Ümit Incekara, Adem Kocyigit, Aydogan, Sakir, and Aydoğan, Şakir
- Subjects
Materials science ,Polymers and Plastics ,Band gap ,02 engineering and technology ,010402 general chemistry ,01 natural sciences ,law.invention ,Metal/organic Sandwich Device ,Chitosan ,chemistry.chemical_compound ,law ,Spin coating ,Electrical Properties ,Organic Chemistry ,Schottky diode ,021001 nanoscience & nanotechnology ,0104 chemical sciences ,Photodiode ,chemistry ,Chemical engineering ,Precursors: X-ray Radiation ,Orthorhombic crystal system ,Crystallite ,0210 nano-technology ,Layer (electronics) - Abstract
Aydoğan, Şakir, Ardahan Üniversitesi Mühendislik Fakültesi Elektrik Elektronik Mühendisliği Bölümü, Makale, This study focused on the structural, optical and electrical features of chitosan organic layer obtained by spin coating technique both on glass and n-Si substrates. XRD results indicated that chitosan has polycrystalline orthorhombic nature. While optical transmittance spectrum of the chitosan organic layer exhibited an increasing tendency in the visible range, band gap energy value was calculated as 4.23 eV for chitosan by UV–Vis spec trometer. Electrical performance of organic chitosan layer in a Schottky device was studied by fabricating of Au/ n-Si and Au/chitosan/n-Si devices. The suitability of Au/chitosan/n-Si sandwich devices in optoelectronic ap plications were tested under dark and illumination conditions. The Au/chitosan/n-Si sandwich device exhibits good photodiode characteristics. Furthermore, the effect of X-ray radiation doses on the electrical properties of the Au/chitosan/n-Si sandwich device was also investigated. In order to get information about electrical char acteristics as a function of X-ray radiation doses, Au/chitosan/n-Si sandwich device was exposed to X-ray ra diation in same exposure time and various doses. The results highlighted that the performance of the device with chitosan organic interface layer deteriorated with increasing radiation dose. In addition, the transportation mechanism of chitosan based Schottky device was discussed in details.
- Published
- 2020
39. Evaluating the Association of Ovarian Reserve with Age in Women with Polycystic Ovary Syndrome
- Author
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Mehmet Dolanbay, Ozguc Altun, Mahmut Tuncay Ozgun, Ercan Aygen, Yılmaz Şahin, and Semih Uludag
- Subjects
Anovulation ,endocrine system diseases ,business.industry ,media_common.quotation_subject ,medicine ,Physiology ,Fertility ,medicine.disease ,business ,Ovarian reserve ,Polycystic ovary ,female genital diseases and pregnancy complications ,media_common - Abstract
Polycystic ovary syndrome (PCOS) is the most common cause of anovulatory infertility. However, they sustained fertility at an advanced age.
- Published
- 2017
- Full Text
- View/download PDF
40. The performance of the anthraquinone/p-Si and the pyridine/p-Si rectifying device under X-ray irradiation
- Author
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Sakir Aydogan, Duygu Ekinci, Abdulmecit Turut, and Yılmaz Şahin
- Subjects
Materials science ,Hydroquinone ,Equivalent series resistance ,Dopant ,02 engineering and technology ,021001 nanoscience & nanotechnology ,010403 inorganic & nuclear chemistry ,Condensed Matter Physics ,Photochemistry ,01 natural sciences ,Anthraquinone ,Spectral line ,0104 chemical sciences ,chemistry.chemical_compound ,chemistry ,Ionization ,Pyridine ,General Materials Science ,Irradiation ,0210 nano-technology - Abstract
Some X-ray irradiation-induced electrical characteristics of the Au/anthraquinone/p-Si and the Au/pyridine/p-Si junction devices have been investigated. The experimental ideality factors increased for both devices with increasing irradiation dose from 25 Gy to 150 Gy. These values ranged from 1.10 to 1.52 for Au/anthraquinone/p-Si and from 1.46 to 1.77 for Au/pyridine/p-Si, respectively. Furthermore, the barrier height of Au/anthraquinone/p-Si increased with increasing irradiation dose from 0.75 to 0.91 eV, whereas it displayed about a constant value for Au/pyridine/p-Si. In addition, the series resistance of both devices increased with x-ray dose too. The increase in the series resistance with x-ray irradiation has been attributed to the decrease in the active dopant densities. It was seen that the ionization damage is effective on most of the junction characteristics. The leakage current of the Au/anthraquinone/p-Si device decreased with x-ray irradiation since the irradiation induced the formation of electron-hole pairs and hydroquinone structure, and thus some of them are trapped by the interface states. The degradation of the I-V curves of Au/pyridine/p-Si/Al device is attributed to the variation of the surface or interface states distribution for the devices. The reverse and forward bias currents relatively increased after x-ray irradiation because of the decrease in bulk lifetime. In addition, ATR-FTIR spectra of anthraquinone and pyridine films showed that pyridine is more stable than anthraquinone under x-ray irradiation.
- Published
- 2016
- Full Text
- View/download PDF
41. Phenol red based hybrid photodiode for optical detector applications
- Author
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Yılmaz Şahin, Mehmet Biber, Ümit Incekara, Sakir Aydogan, Mehmet Yilmaz, and Hatice Kacus
- Subjects
010302 applied physics ,Materials science ,business.industry ,Optical power ,02 engineering and technology ,021001 nanoscience & nanotechnology ,Condensed Matter Physics ,01 natural sciences ,Electronic, Optical and Magnetic Materials ,Photodiode ,law.invention ,Intensity (physics) ,Responsivity ,Rectification ,law ,0103 physical sciences ,Materials Chemistry ,Optoelectronics ,Wafer ,Electrical and Electronic Engineering ,0210 nano-technology ,business ,Current density ,Voltage - Abstract
In this study, the phenol red (PR) dye film has been deposited on n-type silicon wafer and SEM, XRD measurements of the film have taken. Then, the PR/n-Si photodiode has been fabricated and (dark) electrical and photoresponse characterization has been analysed. The current-Voltage (I-V) measurements have been carried out at varied light power ranging from 100 mW/cm2 to 400 mW/cm2. Rectification ratios (RR) have been determined as a function of illumination intensities and they are determined as 115.47 for 100 mW/cm2 and 30.26 for 400 100 mW/cm2, respectively. The ideality factor and the barrier height of the Co/PR/n-Si photodiode have been determined as 2.80 and 0.52 eV, respectively in dark. Therefore, it has been seen that the PR/n-Si photodiode performances are strongly dependent on the incident optical power. Namely, the current density has increased remarkably with the power of light at the same reverse bias voltage and this behavior is explained by strong capability of converting a light signal into an electrical for the PR/n-Si photodiode device. Responsivity (R) and detectivity (D*) of the PR/n-Si photodiode are also plotted as a function of illumination intensities for reverse biases and it is found that both parameters are dependent on the illumination intensity. Finally, the capacitance–voltage (C-V) characteristics of the device have been carried out at various frequencies. Obtained experimental results indicate that the PR dye can be used in various optoelectronic applications.
- Published
- 2020
- Full Text
- View/download PDF
42. The effect of temperature on the electrical characterization of a poly(phenoxy-imine)/p-silicon heterojunction
- Author
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Yılmaz Şahin, Murat Acar, Kadem Meral, Hacı Ökkeş Demir, Zakir Çaldıran, and Sakir Aydogan
- Subjects
Materials science ,Polymers and Plastics ,General Chemical Engineering ,Imine ,02 engineering and technology ,010402 general chemistry ,021001 nanoscience & nanotechnology ,01 natural sciences ,0104 chemical sciences ,Characterization (materials science) ,chemistry.chemical_compound ,chemistry ,Chemical engineering ,Silicon heterojunction ,Physical and Theoretical Chemistry ,0210 nano-technology - Abstract
A poly(phenoxy-imine)/p-silicon rectifying device was fabricated and the current-voltage characteristics of the device were examined as a function of temperature in the 40–300 K range. The temperature dependence of the main parameters, namely, the barrier height (Φb), ideality factor (η), reverse current (I0) and series resistance (Rs), were investigated. It was seen that the Φb and the I0 values of the device increased with increasing temperature, while the η and the Rs values decreased. The temperature dependences of the Φb and the η were interpreted by the assumption of a Gaussian distribution of the barrier heights arising from barrier inhomogeneities that prevailed at the interface of the poly(phenoxyimine)/p-silicon. From ln(I0/T2) vs. 1/ηT plot, the values of the activation energy (Ea) and Richardson constant (A*) were calculated as 0.324 eV and 2.84×10-7 A cm-2K-2, respectively. The experimental value of the Rs from the forward current-voltage plots decreased with an increase in the temperature.
- Published
- 2016
- Full Text
- View/download PDF
43. Genomic, transcriptomic and physiological analyses of silver‐resistant Saccharomyces cerevisiae obtained by evolutionary engineering.
- Author
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Terzioğlu, Ergi, Alkım, Ceren, Arslan, Mevlüt, Balaban, Berrak Gülçin, Holyavkin, Can, Kısakesen, Halil İbrahim, Topaloğlu, Alican, Yılmaz Şahin, Ülkü, Gündüz Işık, Sema, Akman, Süleyman, and Çakar, Zeynep Petek
- Abstract
Silver is a non‐essential metal used in medical applications as an antimicrobial agent, but it is also toxic for biological systems. To investigate the molecular basis of silver resistance in yeast, we employed evolutionary engineering using successive batch cultures at gradually increased silver stress levels up to 0.25‐mM AgNO3 in 29 populations and obtained highly silver‐resistant and genetically stable Saccharomyces cerevisiae strains. Cross‐resistance analysis results indicated that the silver‐resistant mutants also gained resistance against copper and oxidative stress. Growth physiological analysis results revealed that the highly silver‐resistant evolved strain 2E was not significantly inhibited by silver stress, unlike the reference strain. Genomic and transcriptomic analysis results revealed that there were mutations and/or significant changes in the expression levels of the genes involved in cell wall integrity, cellular respiration, oxidative metabolism, copper homeostasis, endocytosis and vesicular transport activities. Particularly the missense mutation in the RLM1 gene encoding a transcription factor involved in the maintenance of cell wall integrity and with 707 potential gene targets might have a key role in the high silver resistance of 2E, along with its improved cell wall integrity, as confirmed by the lyticase sensitivity assay results. In conclusion, the comparative physiological, transcriptomic and genomic analysis results of the silver‐resistant S. cerevisiae strain revealed potential key factors that will help understand the complex molecular mechanisms of silver resistance in yeast. [ABSTRACT FROM AUTHOR]
- Published
- 2020
- Full Text
- View/download PDF
44. Evaluation Of Gynecological Risk Factors In Osteoporosis
- Author
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Alize Yılmaz Şahin, Fazıl Kulaklı, Öznur Uzun, Sumru Özel, Sibel Ünsal Delialioğlu, and Kurtuluş Köklü
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Gynecology ,medicine.medical_specialty ,Obstetrics ,business.industry ,medicine.medical_treatment ,Age at menopause ,Osteoporosis ,Mean age ,General Medicine ,medicine.disease ,Curettage ,Miscarriage ,Osteoporoz,Menopoz ,Menarş ,Osteoporosis,Menopause ,Menarche ,medicine ,In patient ,business ,Body mass index - Abstract
OBJECTIVE: To evaluate gynecological risk factors in patients with and without osteoporosis who are older than 50 years of age.METHODS: One hundred and twenty seven patients with postmenopausal-senile osteoporosis and 53 non-osteoporotic volunteers were included. The subjects were examined in terms of age, body mass index (BMI), risk factors like age at menarche, age at menopause, number of births, numbers of miscarriage and curettage, and history of breast-feeding,RESULTS: The mean age was statistically higher and the mean BMI level was statistically lower in patients (p, AMAÇ: Bu çalışmada 50 yaş üzeri osteoporozu olan ve olmayan olgularda osteoporoz için jinekolojik risk faktörlerini değerlendirmek amaçlanmıştır.YÖNTEMLER: Çalışmaya postmenopozal-senil osteoporoz tanısı alan 127 hasta ve 53 osteoporozu olmayan gönüllü alındı. Katılımcılar yaş, vücut kitle indeksi (VKİ), menarş yaşı, menopoz yaşı, doğum sayısı, düşük-küretaj sayısı, emzirme hikayesi gibi jinekolojik risk faktörleri açısından sorgulandı.BULGULAR: Hastaların yaş ortalaması kontrollere göre daha yüksek, VKİ değerleri daha düşüktü (p
- Published
- 2014
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- View/download PDF
45. The Synthesis of the Fe3O4 Nanoparticles and the Analysis of the Current–Voltage Measurements on Au/Fe3O4/p-Si Schottky Contacts in a Wide Temperature Range
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Mehmet Şinoforoğlu, Yılmaz Şahin, Zakir Çaldıran, Ali Rıza Deniz, Sakir Aydogan, Önder Metin, and Kadem Meral
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Materials science ,Fabrication ,Schottky barrier ,Metals and Alloys ,Analytical chemistry ,Iron oxide ,Nanoparticle ,Schottky diode ,Activation energy ,Atmospheric temperature range ,Condensed Matter Physics ,chemistry.chemical_compound ,chemistry ,Mechanics of Materials ,Magnetic nanoparticles - Abstract
The iron oxide (Fe3O4) magnetic nanoparticles were synthesized via the organic solution phase method and used for the fabrication of the Au/Fe3O4/p-Si rectifying device. The variation in electrical characteristics of the Au/Fe3O4/p-Si Schottky contacts was investigated as a function of temperature using current–voltage (I–V) measurements in the temperature range of 40 K to 370 K (−233 °C to 97 °C). The I–V characteristics of the contacts indicated extremely strong temperature dependence. The double distribution of barrier heights was found in the Fe3O4/p-Si Schottky diodes from the I–V-T measurements. The Schottky barrier height (Φb) increases with the increasing temperature, while the ideality factor n decreases. The nonlinearity in the activation energy plot was observed, which is attributed to barrier inhomogeneities by assuming a Gaussian distribution of barrier heights at the Fe3O4/p-Si interface. The Richardson constant measured from the temperature-dependent I–V characteristics is 2.99 A/K2 cm2, which is lower than the ideal value.
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- 2013
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46. The electrical characteristics of the Fe3O4/Si junctions
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Kadem Meral, Ali Rıza Deniz, Zakir Çaldıran, Sakir Aydogan, Önder Metin, and Yılmaz Şahin
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Materials science ,Equivalent series resistance ,Mechanical Engineering ,Metals and Alloys ,Analytical chemistry ,Space charge ,Rectification ,Mechanics of Materials ,Materials Chemistry ,Irradiation ,Ohmic contact ,Low voltage ,Diode ,Voltage - Abstract
The Fe 3 O 4 /Si junctions have been fabricated. The Fe 3 O 4 NPs have been characterized by using TEM and XRD. Detailed study of the current–voltage ( I – V ) plots and capacitance–voltage measurements of the device (at f = 500 kHz) has been executed. The characteristic parameters of the structure such as ideality factor, barrier height, and series resistance have been calculated from the I – V measurements. The rectification ratio was determined to be ∼3 × 10 4 . The I – V characteristics clearly reveal the mechanism as ohmic at low voltage and that of trap-filled space charge limited current (SCLC) at higher voltage. The effect of X-ray irradiation on the junction characteristics has been studied using in situ current–voltage measurements. Diode parameters are found to vary as a function of the irradiation dose.
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- 2013
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47. Comparison of contrast-enhanced T1 weighted FLAIR SENSE and T1 weighted Spin Echo sequence to detect cranial masses
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Hulya Kurtul Yildiz, Elif Evrim Ekin, and Emel Yılmaz Şahin
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Nuclear magnetic resonance ,business.industry ,T1 weighted ,Spin echo ,Medicine ,Sense (electronics) ,Contrast (music) ,Fluid-attenuated inversion recovery ,business ,Sequence (medicine) - Published
- 2017
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48. A study on the Fresnel diffraction of 6He by means of different microscopic density distributions
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Ismail Boztosun, Yılmaz Şahin, and Murat Aygun
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Elastic scattering ,Physics ,Diffraction ,Nuclear and High Energy Physics ,Nuclear Theory ,Coulomb ,Rainbow ,Halo nucleus ,Scattering theory ,Atomic physics ,Reduction (mathematics) ,Atomic and Molecular Physics, and Optics ,Fresnel diffraction - Abstract
The elastic scattering of the halo nucleus 6He from heavy targets such as 197Au and 208Pb has been investigated in order to explain the Coulomb rainbow peak due to the Fresnel-type diffraction observed in the experimental data. In order to examine the role of nuclear potential to describe 6He + 197Au and 6He + 208Pb systems, we have used the no-core shell model, few-body and Gaussian-shaped density distributions at various energies. The microscopic real parts of the complex nuclear potential have been obtained by using the double-folding model for each of the density distribution and the phenomenological imaginary potentials have been taken as the standard Woods-Saxon shape. We have observed that fewbody and Gaussian-shaped density distributions have given standard Fresnel-type diffraction results, a classical scattering pattern with Coulomb rainbow peak whereas the nuclear potential obtained by using the no-core shell-model density distribution has provided the reduction at Fresnel peak and has given more consistent results with the experimental data.
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- 2012
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49. EXAMINATION OF $V(r) = -\frac{Z}{r} + gr +\lambda r^2$ POTENTIAL IN THE PRESENCE OF MAGNETIC FIELD
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Ismail Boztosun, M. Aygun, and Yılmaz Şahin
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Physics ,Nuclear and High Energy Physics ,Field (physics) ,Iterative method ,General Physics and Astronomy ,Order (ring theory) ,Lambda ,Schrödinger equation ,Magnetic field ,symbols.namesake ,Quantum electrodynamics ,Quantum mechanics ,symbols ,Energy (signal processing) ,Eigenvalues and eigenvectors - Abstract
We present an alternative approach, the asymptotic iteration method, to solve the two-dimensional radial Schrödinger equation for [Formula: see text] potential in a magnetic field. The energy eigenvalues for arbitrary Larmor frequencies ranging from ωL = 0.1 to 10.0 are obtained and the results are compared with the nonmagnetic field case, ωL = 0, in order to show the effect of the presence of the weak and strong magnetic fields on the energy eigenvalues. It is shown that the method presented in this paper provides the energy eigenvalues in a systematic way not only in the weak magnetic field but also in the strong magnetic field regions with any Larmor frequencies.
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- 2010
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50. İşsizlik ve Ekonomik Büyüme İlişkisinde Asimetri = Asymmetry in the Relationship between Unemployment and Economic Growth
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Servet CEYLAN and Burcu Yılmaz ŞAHİN
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lcsh:Commerce ,M-TAR Modeli ,Okun’s Law ,Asimetri ,lcsh:HB71-74 ,lcsh:Economic theory. Demography ,TAR Modeli ,Asymmetry ,lcsh:Economics as a science ,lcsh:Business ,lcsh:HB1-3840 ,M-TAR Model ,lcsh:HF1-6182 ,Okun Kanunu ,Ko-Entegrasyon ,Co-İntegration ,TAR Model ,lcsh:HF5001-6182 - Abstract
Most of the empirical papers researching the validity of Okun’s law have been assumed a symmetric relationship between change of unemployment and real output growth. However, the effect of real output growth on unemployment may be different in growth cycles expansion and contraction periods. This assumption which assumes a asymmetry in Okun’s law has been verified in the recent studies. In the study, whether Okun’s relationship is symmetric or not has been investigated for Turkish economy in the period 1950-2007 using annual time series data. Co-integration analyses including TAR and M-TAR models have been used to test the asymmetric relationship. The findings of the study have shown that Okun’s law is valid in the long run and this relationship is asymmetric for the Turkish economy.
- Published
- 2010
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