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Toplam kayıt 72, listelenen: 21-40
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Simple and convenient preparation of novel 6,8-disubstituted quinoline derivatives and their promising anticancer activities
(Scientific Technical Research Council Turkey-Tubitak, 2013)A short and easy route is described for 6,8-disubstituted derivatives of quinoline and 1,2,3,4-tetrahydroquinoline from 6,8-dibromoquinolines 2 and 7 by various substitution reactions. While copper-promoted substitution ... -
SEM and X-Ray Diffraction Studies on Microstructures in Cu-26.04%Zn-4.01%Al Alloy
(Polish Acad Sciences Inst Physics, 2013)Due to fact that Cu-based alloys are very sensitive to the thermal treatments, in scanning electron microscopy and X-ray diffraction observations, according to the different quenching techniques Cu-26.04%Zn-4.01%Al alloys ... -
Effects Of Meaningful Learning On Conceptual Perceptions Related To "Force And Motion": An Experimental Study For Pre-Service Science Teachers
(Sci Methodical Ctr-Sci Educologica, 2014)The main purpose of science education is to enable students to connect concepts with daily life and establish relations between the concepts. Thus, many implementations related to constructivism have been carried out. The ... -
A study on preschoolers' conceptual perceptions of states of matter: a case study of Turkish students
(Education Assoc South Africa, 2014)The purpose of the present study is to identify preschoolers' conceptual perceptions of states of matter, this issue that they often come across in their daily and social life. The study was designed as a qualitative case ... -
İlköğretim Matematik Öğretmeni Adaylarının Yansıma Simetrisi ile İlgili Yaşadıkları Zorluklar
(2015)Bu çalışma ile ilköğretim matematik öğretmeni adaylarının simetri kavramına ilişkin kavram yanılgılarının ortaya konulması amaçlanmıştır. Araştırmanın katılımcıları, 2012-2013 öğretim yılı güz döneminde Kocaeli Üniversitesi ... -
Development of science laboratory entrepreneurship scale
(Ekip Buro Makineleri A., 2015)The concept of entrepreneurship is a relatively recent concept introduced into educational programs and educational literature and the current study was conducted to determine the entrepreneurship characteristics possessed ... -
In vitro antiproliferative/cytotoxic activity of 2,3 '-biindole against various cancer cell lines
(Tubitak Scientific & Technical Research Council Turkey, 2015)2,3'-Biindole (2) was synthesized via bromination of indole (1) with molecular bromine and underwent simultaneous dimerization. Antiproliferative and cytotoxic activity of 2 was investigated in vitro on C6 (rat brain tumor), ... -
Synthesis of novel cyano quinoline derivatives
(Pergamon-Elsevier Science Ltd, 2015)6,8-Dibromo-1,2,3,4-tetrahydroquinoline (2) and 3,6,8-tribromoquinoline (3) were converted into the corresponding cyano derivatives via copper assisted nucleophilic substitution reactions. While bromination of 6-bromo-8- ... -
Synthesis Of Brominated Quinolines
(Yildiz Technical Univ, 2015)this study, bromination reactions of 1,2,3,4-tetrahydroquinoline by molecular bromine and aromatization reactions of brominated tetrahydroquinolines were reinvestigated. Optimal reaction conditions were established for ... -
Effect of heat treatments on the microhardness and tensile strength of Al-0.25 wt.% Zr alloy
(Elsevier Science Sa, 2015)In the present work, the effect of heat treatments on the microhardness and tensile properties of the Al-0.25 Zr (wt.%) alloy have been investigated. The Al-0.25 Zr (wt.%) alloy was melted in a vacuum furnace, and the ... -
The Investigation Of Menthol's Bioactivity As Theoritical By Using DFT (Density Functional Theory)
(2015)Mints are used tradational medicine for hundred years by humankind. The important constitiuent of mint, menthol, is especially in blood is eager to give reaction as an antioksidan. To understand menthol's bioactivity in ... -
Science Prospective Teachers' Self-efficacy and Views on the Use of Information Technologies in the Teaching of Physics Concepts
(2016)- It is not thought that the learning process is not affected by the technological improvements and changes. In this study, it is especially focused on analyzing the ideas of the prospective teachers whose competencies are ... -
A Study On The Chemical Properties Of Eugenol And Eugenol Acetate, Clove Essential Oils
(Yildiz Technical Univ, 2016)Eugenol and eugenol acetate are a clove essential oil getting from hydrodistilltion of Syzygium aromaticum's buds and leaves. It has antimicrobial, antioxidant, analgesic, anticancer activities and used for protecting foods ... -
An Examination of Cross Sectional Change in Student's Metaphorical Perceptions towards Heat, Temperature and Energy Concepts
(Necmettin Erbakan Univ, 2016)In science teaching, metaphors are important tools for understanding meaningful learning and conceptual formation by the help of daily life language. This study aims to evaluate how the concepts of heat, temperature and ... -
Augmented reality in science laboratories: The effects of augmented reality on university students' laboratory skills and attitudes toward science laboratories
(Pergamon-Elsevier Science Ltd, 2016)This study investigated the effects of the use of augmented reality (AR) technologies in science laboratories on university students' laboratory skills and attitudes towards laboratories. A quasi-experimental pre-test/post-test ... -
Convenient synthesis of disubstituted tacrine derivatives via electrophilic and copper induced reactions
(Pergamon-Elsevier Science Ltd, 2016)The bromination of 2-aminobenzonitrile (2) with molecular bromine (2 equiv) furnished 2-amino-3,5-dibromobenzonitrile (7) in 98% yield. One-pot syntheses are described for dibromotacrine derivatives (6,14-18) utilizing ... -
Effect of heat treatment on the microstructures and mechanical properties of Al-5.5Zn-2.5Mg alloy
(Elsevier Science Sa, 2016)The Al-5.5 Zn-2.5 Mg (wt%) ternary alloy was prepared using a vacuum melting furnace and a casting furnace. Microstructural and mechanical properties of the alloy were investigated as-cast and under heat-treated conditions. ... -
A Study on Piperine, Active Compound of Black Pepper
(2016)Piperine, the most important compound of black pepper, is used for treating several diseases such as breast, colon, rectal, and stomach cancer. In this study, the thermodynamical properties of this molecule in blood were ... -
Yaşamdaki Matematiğe Yönelik 3B Sanal Öğrenme Ortamının (MATHLIFE) Uygulanması: Deneyimler ve Zorluklar
(2017)Son yıllarda kullanımı gittikçe yaygınlaşan 3 boyutlu (3B) sanal öğrenme ortamlarının öğrencilerin öğrenmesini kolaylaştırmada güçlü bir potansiyelinin olduğu bilinmektedir. Matematik gibi öğrenilmesinde ve öğretiminde ... -
A New Approach Of Gluten Derivatives For Activity As Theoretical
(Yildiz Technical Univ, 2017)Gluten is the mainly rubbery mass that remains after wheat dough is being washed to remove starch granules and water-soluble constituents. Gluten is known as proteins and it plays an important role in indicating the unique ...