Sürdürülebilir Kalkınma Amaçları
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- Dertli, Enes(47)
- Pat, Suat(29)
- Özen, Soner(29)
- Şenay, Volkan(24)
- Korkmaz, Şadan(23)
- Esmer, Yusuf(21)
- Şahin, Engin(21)
- Korkmaz, Özge(20)
- Cuce, Erdem(19)
- Öner, Erdal(18)
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- Yilmaz, Mustafa Tahsin(17)
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- Kaya, Yunus(15)
- Cinar, Mehmet(13)
- Cuce, Pinar Mert(12)
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- Can, Zehra(10)
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- Büte, Mustafa(9)
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- Kaplan, Abdullah(9)
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Yayınlar
- MakaleYalnız künye2013Coğrafya dersi öğretim programında doğal afetler
İlter, İlhan; Degirmenci, Yavuz
Yaşadığımız dünyanın bir gerçeği olan afetler, toplumları ve çevreyi her türlü açıdan etkilemektedir. Dünyanın farklı yerlerinde farklı zaman ve türlerde yaşanan bu afetler; psikolojik, sosyal, ekonomik ve kültürel yönden insanların yaşamını etkilemektedir. Bilindiği üzere ülkemiz doğal afetler açısından son derece riskli bir yapıdadır. Türkiye'nin, bulunduğu coğrafi konum itibariyle deprem kuşakları üzerinde bulunması ülkemizde sık sık depremlerin yaşanmasına neden olmaktadır. Bunun yanında yeryüzü çeşitliliği, farklı iklimlerin ve ekstrem durumları yaşanması, bu konuda afet bilincinin ve afet eğitiminin yeterli düzeyde olmaması ülkemizdeki afetlerin etkisini artırmaktadır. Afet bilinci ve afet eğitimi, çevreye duyarlı ve çevreyle uyumlu insan profilinin oluşmasında eğitimin ve eğitim programlarının büyük rolü vardır. Bu açıdan bakıldığında; coğrafya dersi, çevreyi tanıyan, sorumluluklarının ve sınırlarının farkında olan, doğal afet bilincine sahip bireylerin yetişmesi açısından önemli bir derstir. Bu araştırmanın amacı da Coğrafya Dersi Öğretim Programında; Doğal Afetlere ilişkin öğrenme alanlarının, kazanımların, etkinliklerin, becerilerin, değerlerin (kişisel niteliklerin), ölçme ve değerlendirme tekniklerine ne düzeyde yer verildiğini belirlemektir. Doküman analizi inceleme yönteminin kullanıldığı bu araştırmada, uygulanmakta olan Coğrafya Dersi Öğretim Programı temel alınarak programda Doğal Afetlere ilişkin doğrudan ve dolaylı olabilecek ifadeler aranmıştır. Elde edilen veriler betimsel analiz yöntemi kullanılarak çözümlenmiştir. Araştırma sonucunda doğal afetlere ilişkin kazanımlara her sınıf düzeyinde yer verildiği görülmüştür. Bu kazanımların en çok 9. Sınıf düzeyinde olduğu (f=24) ve en az ise 12. Sınıf düzeyinde olduğu (f=22) tespit edilmiştir. Kazanımların öğrenme alanlarına göre dağılımı incelendiğinde ise "çevre ve toplum" öğrenme alanında yoğunluk kazanmış, "küresel ortam: bölgeler ve ülkeler" öğrenme alnında ise bu oranın daha az olduğu görülmüştür.
AtıfTR Dizin25
İncele - MakaleYalnız künye2013Öğretmen adaylarının yaratıcı düşünme düzeylerinin farklı değişkenler açısından incelenmesi
Küçük Demir, Betül; Isleyen, Tevfik
Bu araştırmanın amacı öğretmen adaylarının yaratıcı düşünme düzeylerini farklı değişkenler açısından incelemektir. Çalışmanın örneklemini Bayburt Üniversitesi Sınıf Öğretmenliği ve Fen Bilgisi öğretmenliği bölümlerinde öğrenim gören toplam 140 öğretmen adayı oluşturmaktadır. Araştırmada veri toplama aracı olarak "Torrance Yaratıcı Düşünme Testi (TYDT) Sözel Forma-A ve Şekilsel Form-A" kullanılmıştır. Verilerin çözümlenmesinde SPSS 18.0 paket programı kullanılarak iki yönlü ANOVA, bağımsız t testi ve Mann Whitney-U testi yapılmıştır. Elde edilen bulgulara göre Torrance yaratıcı düşünce testinin sözel kısmında yer alan sözel akıcılık, sözel esneklik ve sözel orijinallik puanları arasında öğretmene adaylarının cinsiyetleri açısından anlamlı bir farklılık bulunmazken, bölümleri açısından her biri için Sınıf Öğretmeni adaylarının lehinde anlamlı bir farklılık bulunmuştur. Torrance yaratıcı düşünce testinin şekilsel kısmında ise şekilsel formun alt boyutları olan orijinallik, başlıkların soyutluğu ve erken kapamaya direnç puanları arasında öğretmen adaylarının cinsiyetleri ve bölümleri arasında anlamlı bir farklılık bulunmazken, akıcılık ve zenginlik(detaylandırma) puanlarının sınıf öğretmeni adayları lehinde anlamlı bir farklılık görülmüştür
AtıfTR Dizin18İncele - MakaleYalnız künye2013The Views of Field Experts in Determining the Mathematic Questions for Seventh Class Level Exam’s
Kansu, Ceren Çevık; Bıçak, Bayram
The purpose of this study was to determine the level achieved in measuring the higher order thinking skills in 2008 seventh grade mathematic questions and the level of importance given to these higher order thinking skills, according to the views of field experts. The research group for this study consisted of 30 mathematics education experts at various universities in Turkey. Research data was provided via the “SBS exam seventh grade Identifying Higher Order Thinking Skills of Mathematics Scale” developed by Çevik (2009). The data was obtained by calculating the percentage and frequency integrated table. As a result of this research, examined by taking the percentage and frequency values of opinions above 50% into consideration, it was found that the mathematic questions in the 2008 SBS exam do not contain questions that measure higher order thinking skills. Also, the level of importance given to higher order thinking skills by experts in terms of 7th grade math acqusitions is very high. In structuring the questions for exams, carrying vital importance for students, opening the door to higher order thinking must be brought into the foreground
- MakaleYalnız künye2013The Investigation of Instructional Leadership Attitudes of Primary School Headmasters in Terms of Teacher Perception
Ergen, Yusuf
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AtıfTR Dizin1İncele - MakaleYalnız künye2013An Example for The Effect of 5E Model on the Academic Achievement of Students: In The Unit of “Force and Motion”
Aksoy, Gokhan; Gurbuz, Fatih
The aim of this study is to compare the effectiveness of 5E model and teaching method and models suggested by course books developed based on Science and Technology teaching program and approved by Ministry of Education on seventh grade students’ academic achievements in the unit “Force and Motion”. The subjects of the study were 57 seventh grade students at a primary school in Erzurum, who were in two different classes and taught by the same teacher at 2011-2012 education year. One of the classes was randomly selected as experimental group (n=27) in which students were thought by means of activities which were prepared according to the 5E model, and the other was determined as the control group (n=30) in which students were thought by teaching method and models suggested by course books developed based on Science and Technology teaching program and approved by Ministry of Education. The main instruments for obtaining data were the Force and Motion Academic Achievement Test (FMAAT). The study results were analyzed by SPSS. The data obtained on instruments were evaluated by using descriptive statistic, independent samples t test, paired sample t test and effect sizes. As the result of the research revealed that experimental group in which students were thought by means of activities which were prepared according to the 5E model is more successful than control group in which students were thought by teaching in control group was carried out teaching method and models suggested by course books developed based on Science and Technology teaching program and approved by Ministry of Education in the unit “Force and Motion”
AtıfTR Dizin3İncele - MakaleYalnız künye2013Öğretmen Adaylarının Matematiğe Karşı Tutumlarının İncelenmesi
Küçük Demir, Betül; Kahraman, Sakip; Isleyen, Tevfik
Bu çalışmada öğretmen adaylarının matematiğe karşı tutumlarının bazı değişkenler açısından incelenmesi amaçlanmıştır. Bu amaçla, araştırmanın örneklemi Atatürk Üniversitesi, Kazım Karabekir Eğitim Fakültesi, Ortaöğretim Matematik Öğretmenliği (N=93) ve İlköğretim Matematik Öğretmenliği (N=148) bölümlerinde öğrenim gören toplam 241 öğretmen adayı olarak belirlenmiştir. Araştırmada veri toplama aracı olarak literatürden elde edilen "Matematiğe Karşı Tutum Ölçeği" kullanılmıştır. Elde edilen veriler istatistiksel olarak (ANOVA) analiz edilmiştir. Bulgular, öğretmen adaylarının öğrenim gördükleri bölümler açısından matematiğe karşı tutumlarında anlamlı düzeyde bir farklılık olduğunu ortaya koymaktadır. Aynı zamanda, analiz sonuçları cinsiyet ve sınıf düzeyi arasında önemli düzeyde bir etkileşimin olduğunu göstermektedir. Çalışmanın sonuçları derse karşı olan tutumun önemi açısından tartışılmıştır.
AtıfTR Dizin4İncele - MakaleYalnız künye2013Importance of proverbs and idioms as a means of language and culture transfer in turkish education and instruction
Bulut, Mesut
Each society prepares education programs suitable to their needs in order to maintain its existence and implements them. The existence of a state and its continuity directly depends on educational policies. The main purpose of these education policies is to foster unity and solidarity. The individuals’ gaining national awareness or national conscience, thinking multi dimensionally, expressing themselves, in short, asserting their existence, can be actualized with only education. In this regard the content of the education programs are very important. Teaching individuals language and culture, raising awareness, teaching the written and verbal literary works which compose the language and tongue depend on their being internalised. In accordance with the general goals of Turkish national education in order to adopt the politeness and loveliness of the language and to satisfy the individuals socially and culturally the students should be educated in parallel with the Basic National Education Law numbered 1739, Article 2 of the Law which states “the main purpose of Turkish National Education is to raise all the individuals of Turkish nation as citizens who rely on Ataturk’s principles and revolution and Ataturk nationalism which is stated in the Constitution, adopt, preserve, and develop the national, moral, humanistic, spiritual, and cultural values of Turkish nation, love their family and motherland and nation and try to glorify them, know their duties and responsibilities for civil rights and Turkish Republic , a democratic, secular and social and constitutional state which rely on the basic principles stated at the beginning of the Constitution and also behave accordingly ”. Therefore, proverbs and idioms, one of the important education-instruction tools in Turkish society which enable the social and cultural values to be adopted by the individuals and important cultural components of our nation, play an important role in language teaching, culture acquisition and transfer as it is appropriate to the goals of education programs. Proverbs and idioms have important effects in terms of making the narration effective, expressing what is said clearly, easily, understandably and express them in writing. In this regard they are the most important indicators of richness of Turkish and Turkish culture. Proverbs and idioms are indispensable for language learning skills which are reading, writing and speaking in Turkish education. Literature search model is used in this study and the aim of the study is to examine the importance of the proverbs, which play an important role in Turkish education and instruction, on the birth of the cultural values, their existence and transfer to the young generation. Moreover, the study focuses on the deficiencies in teaching proverbs and idioms and it aims at making contributions to the studies which are going to be conducted by presenting the importance and functions of proverbs and idioms in Turkish teaching
AtıfTR Dizin32İncele - MakaleYalnız künye2013Sosyal bilgiler dersinde sorgulayıcı-araştırma tabanlı öğrenme modeli: başarı ve öğrenmede kalıcılığın incelenmesi
İlter, İlhan
Bu araştırmanın amacı, Sosyal Bilgiler Dersi öğretiminde sorgulayıcı-araştırma tabanlı öğrenme modelinin öğrencilerin akademik başarı ve öğrenmede kalıcılıkları üzerine etkilerini incelemektir. Çalışmada Sosyal Bilgiler Dersinde sorgulayıcı-araştırma tabanlı öğrenme modelinin öğretimi ile öğrencilerin üst düzey düşünme becerilerini kullanmaları, bilgilerini genişletmeleri ve sınıf dışındaki dünyayla zengin bağlantılar kurmaları hedeflenmiştir. Araştırmada ön test ve son test kontrol gruplu yarı deneysel desen kullanılmıştır. Deneysel uygulama, Sosyal Bilgiler Dersi "Üretim, Dağıtım ve Tüketim" öğrenme gerçekleştirilmiştir. Araştırma 2012-2013 eğitim-öğretim yılı bahar yarıyılı döneminde Bayburt İli, Mahmut Kemal Yanbeğ Ortaokulu 5. sınıf öğrencileri ile yürütülmüştür. Beş hafta (15 saat) boyunca "Ürettiklerimiz" ünitesi konuları, deney grubunda Stripling SorgulayıcıAraştırma Tabanlı Öğrenme Modeli'nin aşamalarına uygun olarak geliştirilen etkinlikler; kontrol grubunda ise aynı ünite 5. sınıf Sosyal Bilgiler Dersi Öğretmen Kılavuz Kitabı'ndaki etkinlik ve yöntemlerle işlenmiştir. Araştırmada elde edilen sonuçlara göre, sorgulayıcıaraştırma tabanlı öğrenme modelinin 5.sınıf Sosyal Bilgiler Dersini "Öğretmen Kılavuz Kitabı"ndaki etkinlik ve yöntemlere göre işlemenin, öğrencilerin akademik başarı ve öğrenmede kalıcılık düzeyleri üzerinde yüksek derecede anlamlı bir etkisinin olduğu ve önemli katkılar sağladığı görülmüştür. Bu noktada yapılandırmacı Sosyal bilgiler dersi sınıflarında sorgulayıcı-araştırma tabanlı öğrenme modelinin kullanımı; öğrencileri çevrelerindeki dünya hakkında sorular sormaya, kendi sorularını cevaplamak için bilgiler toplamaya, sahip olduğu ön bilgi ve becerilerle topladığı bu bilgileri yorumlamaya ve kendi bulguları hakkında çıkarımda bulunmaya teşvik edebilir
AtıfTR Dizin12İncele - MakaleYalnız künye2013The relationship between the perception of transformational leadership and knowledge management capabilities: A case study on the kosgeb firms
Kahya, Cem; Naralan, Abdullah; Yıldız, İbrahim
The purpose of this study is to examine the relationships between the perceptions oftransformational leadership and knowledge based organization and organizational knowledgecreation process called knowledge management capabilities. The sample of this study was consisted of90 firms registered Republic of Turkey Small and Medium Enterprises Development Organization inErzurum. The survey study was conducted on the employees of these firms. As a result of the researchshowed that transformational leadership both affected knowledge based management andorganizational knowledge creation process significantly and positively, and knowledge based management has more effects on organizational knowledge creation process significantly andpositively.
AtıfTR Dizin1İncele - BildiriYalnız künye2013TECHNOLOGY SUPPORTING THE EVOLUTION OF SPATIAL THINKING: A CASE STUDY WITH PRE-SERVICE TEACHERS
Karadag, Zekeriya; Chova, LG; Martinez, AL; Torres, IC
Pre-service teachers, taking a method course to teach mathematics at elementary classroom, were exposed to explore various activities by using soma cubes. The research explores the participants' evolving ability of spatial visualization, which was very low at the beginning. They were struggling while drawing or constructing even very basic constructions. However, the improvements were accelerated as they integrated technological tools, StarBoard and SketchUp because of the flexibility and usability provided by these tools. The main corpus of data consists of participant own reflections on the pros and cons of integrating technology and how technology affected their visualization and spatial reasoning.
- BildiriYalnız künye2013EXPLORING THE EVOLUTION OF GEOMETRICAL THINKING
Karadag, Zekeriya; Chova, LG; Martinez, AL; Torres, IC
Geometry situated artefacts is a great resource to have learners experience geometry. This study explores how pre-service teachers go through this experience and how they benefit by connecting real life geometry to their learning geometry trajectory. Moreover, the study documents how participant pre-service teachers develop understanding of basic transformational geometry. The results suggest that participants may also have learned how to encourage their prospective students.
- MakaleYalnız künye2013The Natural Disasters in the Geography Teaching Curriculum
Degirmenci, Yavuz; Ilter, Ilhan
Disasters affect all aspects the communities and environment is a fact that we live on of our world. It takes place that types of natural disasters at different times and in types of the world and these affect people in many ways such as social, economic, and cultural. As it known that our country is an extremely risky structure in terms of natural disasters. Because of locating on the earthquake zones of Turkey's geographical position causes frequent to exposure earthquakes. In addition, existence of diversity of the earth surface, different climates, extreme situations, and lack of information about disaster education disaster awareness increase effect of disasters in our country. Education and training programs play an important role on disaster awareness and disaster education and formatting of human profile which is sensitive to environmental and compatible with environmental. From this perspective, geography lesson is an important on growing the consciousness of individuals who know his environment, aware of his boundaries and has awareness of natural disasters. The purpose of this study is determined how many activities, skills, values, techniques of measurement and evaluation, achievements, learning fields about natural disasters in the Geography Teaching Curriculum. This study used method of analysis document; it is exampled that sufficiency of Natural Disasters is in the program by based on current Geography Teaching Curriculum. The data obtained were analyzed using descriptive analysis. To results, it has seen that about achievements of natural disasters have been in the level of every grades. It has been determined that most of these achievements are levels of 9th the grade (f=24) the least is 12th grade (f=22). Analyzed the distribution of achievements by learning fields; it is intensity in the in the environment and society of learning field and it has been seen that it has observed less in the global environment: regions and countries of learning field.
- BildiriYalnız künye2013THE EFFECT OF 7E MODEL ON ACADEMIC ACHIEVEMENTS AND RETENTION IN THE UNIT ELECTRICITY IN OUR LIFE 6TH GRADE SCIENCE AND TECHNOLOGY COURSE
Turgut, Umit; Gurbuz, Fatih; Salar, Riza; Chova, LG; Martinez, AL; Torres, IC
The aim of this study is to determine the effects of materials based on the 7E learning model on students' achievement and retention of knowledge at unit of Electricity in Our Life in Science and Technology course on elementary school at 6th grade. This study was carried out with 45 sixth grade students in two classrooms of a public elementary school at the second semester of 2011-2012 academic year. In the study, pretest and posttest control and comparison group quasi-experimental is used. One of the classrooms was selected randomly as the experimental group (n=24) and the another as the control group (n=21). While the students in the experimental group were carried out with materials based on 7E learning model, teaching in control group was carried out according to teaching method and models suggested by course books developed based on Science and Technology teaching program and approved by Ministry of Education. As a tool for collecting data both before and after applications, Electricity in Our Life Test was applied on the students in the both groups. In order to test the hypotheses of the study, for dependent and independent groups t test was used. When it was evaluated the data gained from the pretests, it was observed that the groups had the same knowledge level. As a result of the statistical study, it was found out that materials based on 7E learning model support significantly students' achievement and retention level.
- BildiriYalnız künye2013THE ATTITUDES OF PHYSICS TEACHER CANDIDATES TOWARDS THE CONCEPTS IN SPECIAL THEORY OF RELATIVITY AND THEIR EVALUATION DESIGNS
Turgut, Umit; Salar, Riza; Gurbuz, Fatih; Chova, LG; Martinez, AL; Torres, IC
In this study, the viewpoints of physics teacher candidates at undergraduate level towards the concepts in special theory of relativity and the interpretations they made about these concepts were investigated. The attitudes of the teacher candidates towards the concepts in the subject of special theory of relativity were revealed with six open ended questions prepared by the writers who are physics teachers as well. The research is a qualitative study and the study was conducted with eighteen teacher candidates. In this study, case study, one of the methods of qualitative research, was used. The study group of the research was chosen by convenience sampling. The data collected via open ended questions was analysed by descriptive analysis method. According to the results of the study, it was revealed that most of the students have not been introduced to the special theory of relativity and the concepts related to them. It can be stated that the candidates had difficulty with the relativity of time and its reference frame. Most of the teacher candidates could not make the interpretation that the speed of light was the limit speed and no other object could reach that speed.
- MakaleYalnız künye2013The Iddet Time and the Marriage of the Woman Waiting Iddet Time According To Islamic Law
Erdem, Suat
In the Islamic Law, Iddet means the disappearence of the marriage principles with the ending of the marriage because of any reasons and the time must be waited for another marrige by the woman. Iddet can be classified in two with regard of the causes of the action giving rise the divorce as the iddet of divorce and death, and it also can be subjected to a classification for the time of iddet as menstruation, pregnance and periodical iddet. As it is impossible to make a marriage proposal to a woman who is waiting the time of iddet directly or indirectly, there is an agreement on the subject of the impossibility of making a marriage proposal to a woman directly. As it is not possible to make a marriage proposal to a woman waiting iddet of death directly, an indirect proposal is possible only with an agreement. There is an agreement among the Islamic Lawyers on the subject of canceling the marriage which has taken place notwithstanding the ban, but the agreement isn't available about the marrige of the same couple after the time of iddet.
AtıfWoS1
İncele - Derleme MakaleYalnız künye2013Scopus SJRQ1Toward a sustainable energy future in Turkey: An environmental perspective
Serencam, Huseyin; Serencam, Ugur
As long as the energy future of Turkey is concerned there is a consensus among all parties involved in the subject that a strong sustainability based on diverse range of renewable and variety of sources with efficient and fair use of energy is a must. The main criterion in this approach is to use energy with the least possible greenhouse gases and other harmful emissions. A shift in focus to meeting the needs of energy service sector will be immediately felt in the sustainable energy future in Turkey. Another important aspect of the sustainable energy future of Turkey is that all energy users, as more knowledgeable and active participants will be more involved in various stages of the process. However, Turkey has a long way to reach this vision, because of growing greenhouse emissions related to energy production and utilization of alternative energy is slow. Besides, the intensity of energy of the Turkish economy is decreasing slower than many other OECD countries. In addition, energy consumption per person in Turkey is far above the service needs, even for modern lifestyles. There are substantial obstacles on the way to a sustainable energy future of Turkey, such as various aspects of economic structure, a misdirected energy market process, and a lack of vision among the decision makers.
AtıfScopus12WoS10OpenAlex12
İncele - MakaleYalnız künye2013Scopus SJRQ2The infrared, Raman, NMR and UV spectra, ab initio calculations and spectral assignments of 2-amino-4-chloro-6-methoxypyrimidine
Cinar, Z.; Karabacak, M.; Cinar, M.; Kurt, M.; Chinna Babu, P.; Sundaraganesan, N.
(Graph Presented) The 2-amino-4-chloro-6-methoxypyrimidine abbreviated as ACMP have been investigated by both the experimental and theoretical methods; through this work we provide the essential fact about the structural and vibrational insights. The optimized molecular structure, atomic charges, vibrational frequencies and ultraviolet spectral interpretation of ACMP have been studied by performing DFT/B3LYP/6-311++G(df,pd) level of theory. The FT-IR, FT-Raman spectra were recorded in the region 4000-400 cm -1 and 4000-50 cm-1 respectively. The UV absorption spectrum of the compound that dissolved in ethanol and water solution were recorded in the range of 200-400 nm. The scaled wavenumbers are compared with the experimental values. The difference between the observed and scaled wavenumber values of most of the fundamentals is very small. Based on the UV spectrum and TD-DFT calculations, the electronic structure and the assignments of the absorption bands were carried out. The 1H, 13C and DEPT 135 nuclear magnetic resonance (NMR) chemical shifts of the molecule were calculated using with the Gauge Including Atomic Orbital (GIAO) method and compared with experimental results. Besides, molecular electrostatic potential (MEP), frontier molecular orbitals (FMO) analysis were investigated using theoretical calculations.
AtıfScopus11WoS10OpenAlex11
İncele - MakaleYalnız künye2013Scopus SJRQ2Determination of structural, spectrometric and nonlinear optical features of 2-(4-hydroxyphenylazo)benzoic acid by experimental techniques and quantum chemical calculations
Cinar, Mehmet; Yildiz, Nihat; Karabacak, Mehmet; Kurt, Mustafa
The optimized geometrical structure, vibrational and electronic transitions, chemical shifts and nonlinear optical properties of 2-(4-hydroxyphenylazo)benzoic acid (HABA) compound were presented in this study. The ground state geometrical structure and vibrational wavenumbers were carried out by using density functional (DFT/B3LYP) method with 6-311++G(d,p) basis set. The vibrational spectra of title compound were recorded in solid state with FT-IR and FT-Raman spectrometry in the range of 4000-400 cm-1 and 4000-10 cm-1; respectively. The fundamental assignments were done on the basis of the recorded spectra and total energy distribution (TED) of the vibrational modes. The 1H and 13C NMR spectra were recorded in deuterated DMSO solution, and gauge-invariant atomic orbitals (GIAOs) method was used to predict the isotropic chemical shifts. The UV-Vis absorption spectra of the compound were observed in the range of 200-800 nm in ethanol, methanol and water solvents. To investigate the nonlinear optical properties, the polarizability, anisotropy of polarizability and molecular first hyperpolarizability were computed. A detailed description of spectroscopic behaviors of compound was given based on the comparison of experimental measurements and theoretical computations.
AtıfScopus19WoS19OpenAlex19İncele - MakaleYalnız künye2013Scopus SJRQ3Purification and characterisation of laccase from lactarius volemus and its application in removal of phenolic compounds from fruit juice
Nadaroglu, Hayrunnisa; Tasgin, Esen
Laccases are multicopper oxidases (EC 1.10.3.2.), widely distributed in fungi, higher plants and bacteria. In this research, a laccase from Lactarius volemus (Russulaceae) was purified by 73.08 fold using precipitate of saturation (NH4)2SO4, DEAE-cellulose and Sephacryl S200. It was shown that purified enzyme was homogeneous in term of SDS-PAGE with molecular mass estimated of 30 kDa. The pH was optimal at 4.0, enzyme was stable at pH 3.0-5.0 and optimal temperature was at 50°C. Cu2+ and Fe2+ were activated to the purified laccase enzyme, and it was partially inhibited by 5 mM concentration of some metal salts and EDTA, urea, SDS, L-cysteine, dithioeritritol and β-mercaptoethanol. In addition, it was investigated whether the purified and characterized laccase enzyme would remove the phenolic compound of some fruit juices which are responsible for haze formation and browning during storage. Their application led to reduction of total phenolic compounds for apple, apricot, cherry and grape juice. As a result, the effect of these enzymatic treatments on total phenol content and clarity of the juice were evaluated using a central composite design. This laccase enzyme had potential application in food processing.
AtıfScopus18İncele - MakaleYalnız künye2013Scopus SJRQ3Application of carrier element free coprecipitation (CEFC) method for determination of Co(II), Cu(II) and Ni(II) ions in food and water samples
Serencam, Huseyin; Duran, Celal; Ozdes, Duygu; Bektas, Hakan
A simple and highly sensitive separation and preconcentration procedure, which has minimal impact on the environment, has been developed. The procedure is based on the carrier element free coprecipitation (CEFC) of Co(II), Cu(II), and Ni(II) ions by using 2-{4-[2-(1H-indol-3-yl)ethyl]-3-(4-methylbenzyl)-5-oxo- 4,5-dihydro-1H-1,2,4-triazol- 1-yl}-N'-(pyridin-2-yl methylidene)acetohydrazide (IMOTPA), as an organic coprecipitant. The levels of analyte ions were determined by flame atomic absorption spectrometry (FAAS). The detection limits for Co(II), Cu(II) and Ni(II) ions were found to be 0.40, 0.16 and 0.17 μg L-1, respectively, and the relative standard deviations for the analyte ions were lower than 3.0%. Spike tests and certified reference material analyses were performed to validate the method. The method was successfully applied for the determination of Co(II), Cu(II) and Ni(II) ions levels in sea and stream water as liquid samples and red pepper, black pepper, and peppermint as solid samples.
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