Responses of antioxidant defense system of Helianthus annuus to abscisic acid treatment under drought and waterlogging.

Yüksel Keleş, Serpil Ünyayar

The effect of abscisic acid (ABA) treatment on growth pigments and antioxidant defense system were in vestigated in seedlings of Helianthus annuus (cvs. Nantio F1 and Özde mirbey) subjected to drought and waterlogging stress. In addition, seedlings were sprayed with 10 µM ABA three times every other day. Reltive growth rate (RGR) was significantly reduced in both genotypes under drought stress, however, this growth inhibition was less in ABA-treated plants. Total chlorophyll content increased by drought stress in both gentypes. Ascorbate was not influenced by drought, while α-tocopherol in creased in cv. Nantio F1. Ascorbate and α-tocopherol in creased with drought stress in cv. Özdemirbey. ABA treat ment de creased ascorbate and ß-carotene contents while it increased α-tocopherol and xan...

Aqueous extract of Acacia cyanophylla leaves as environmentally friendly inhibitor for mild steel corrosion in 1 MH2SO4 solution

Gülşen Avcı, Yüksel Keleş

The efficiency of Acacia cyanophylla leaves extract as an environmentally friendly inhibitor for mild steel in aerated aqueous 1M H2SO4 solution has been investigated by potentiodynamic polarization measurements and electrochemical impedance spectroscopy techniques. Addition of inhibitor decreases the corrosion current whereas the corrosion potential values show slight shifts in positive directions. Inhibition efficiency was found to be about 93% (the maximum value was determined from the polarization curve). Efficiencies obtained from both electrochemical techniques are in good agreement. Adsorption of acacia cyanophylla leaves extracton mild steel surface in 1 M H2SO4 solution obeys Langmuir adsorption isotherm. Polarization curves were also obtained at different temperatures in order to...

Gülşen Avcı sciencedirect.com alanından [HTML] Inhibitor effect of N, N′-methylenediacrylamide on corrosion behavior of mild steel in 0.5 M HCl

Avcı, Gülşen

N,N′-Methylenediacrylamide has been evaluated as a corrosion inhibitor for mild steel electrodes in 0.5 M HCl solution using potentiodynamic polarization, electrochemical impedance spectroscopy, and polarization resistance measurements. According to the experimental results, inhibition efficiency increased with increasing inhibitor concentration. Potentiodynamic measurements showed that the presence of inhibitor molecules decreases cathodic and anodic currents and shifts corrosion potential to a more positive potential region. Adsorption of the inhibitor molecules to the mild steel surface obeyed the Langmuir adsorption isotherm. Adsorption free energy was calculated from the adsorption isotherm as −26.8 kJ mol−1. The negative value of ΔGads showed that the adsorption process is spontaneou...

Fen Bilgisi Öğretmenliği Programındaki Alan Derslerinin Mesleki Yeterliliğe Katkısına Yönelik Öğretmen Adayı Görüşleri

Say, Fuat Serkan

GÖKYÜZÜ GÖZLEM YAZILIMI İLE DESTEKLENMİŞ ASTRONOMİ ÖĞRETİMİNİN FEN BİLGİSİ ÖĞRETMEN ADAYLARININ ASTRONOMİ ÖĞRETİMİ ÖZ-YETERLİKLERİNE ETKİSİ

Say, Fuat Serkan

THE EFFECT OF INSTRUCTION WITH AUGMENTED REALITY ASTRONOMY CARDS ON 7 TH GRADE STUDENTS’ ATTITUDES TOWARDS ASTRONOMY AND ACADEMIC ACHIEVEMENT

Say, Fuat Serkan

The Effect Of The Computer Game Developed For The 7th Grade Science Lesson, On Student’s Self-Efficacy Toward Science

Say, Fuat Serkan

Human being starts learning about life via games. Therefore games have always maintained their importance and have always been interesting since the beginning of the human life. Games are being moved from streets to virtual platforms today as information Technologies are considerably progressing. And because of that, computer games are one of the entertainments for people today, especially for the children of school age. Analysing the literature, we find the computer games to have many positive effects on children’s performance at school. In this research, the effect of the computer game developed for the 7th grade science lesson, on student’s selfefficacy toward science is studied. Quasi-experimental design is used as the quantitative research method. The study group consists of 444 7th g...

Tasarlanan Bir Bilgisayar Oyununun Yedinci Sınıf Öğrencilerinin Fen Bilimleri Dersine Yönelik Motivasyonlarına Etkisinin Değerlendirilmesi

Say, Fuat Serkan

The Effects of Class Attendance on Academic Achievement and the Views of Preservice Teachers about Attendance and Absenteeism

Say, Fuat Serkan

It is an important element that students should attend the class regularly to be successful in all educational institutions practicing formal education. The aim of the research is to stduy the relation between the academic achievement and class attendance rank of 46 preservice teachers attending the 4th grade of the department of science education in primary education in Pamukkale University. This reserach in which the mixed method was used adopted both quantitative adn qualitative research techniques. In this research survey model is adopted from the point of quantitative method and case study model is adopted from the point of qualitative method. The paradigm of the reserach from the point of quantitative method is constituted by science preservice teachers taking astronomy lessons. Int...

INVESTIGATION OF THE FACTORS INFLUENCING TEACHING PROFESSION CHOICES OF PEDAGOGICAL FORMATION TRAINEES

Say, Fuat Serkan

The Effect of Teaching Materials Determined according to the Model 5e in Resolving the Misconceptions: Frictional Electricity

Say, Fuat Serkan

This study investigates if the misconceptions of frictional electricity among primary students can be resolved by the teaching materials determined according to the model 5E. Study groups of the research consist of 62 students, attending the 7th grade, in totaly 32 for the experimantal group, 30 for the control group, in a public school in Denizli. The concept test, determined regarding the misconception acquired as a result of a literature review, is applied to the two groups as the pre-test. After a while, considered enough, the lesson “Frictional Electricity” is explained to the students reorganising the teaching metarials according to the model 5E. At the end of the lesson the concept test is applied to the both groups as the post-test. As a result of examining the pre-test and post-te...

A Computer Game Implementatıon: Indıvıdually Or In A Group

Say, Fuat Serkan

In this research, the effect of playing a computer game individually or in a group on students’ academic achievements was investigated. In addition, it was determined that whether students gender significantly differ or not according to playing the computer game individually or in a group. In this study, among the experimental research designs, Solomon research model was used. In the study carried out in the first semester of 2014-2015 academic year at a public school, a total of 90 students took part as 2 experimental (n=45) – 2 control groups (n=45). A science computer game that was played on the internet. Students in experimental groups played the science game as three people in groups in addition to science lessons. Students in control gorups played the game on computer individually. T...

The Evaluation of the Effect of a Newly Designed Computer Game on 7th Grade Students’ Motivation Towards Science and Aggression

Say, Fuat Serkan

In this study, it is aimed to design a computer game for the 7th grade Science lesson and evaluate the effect of the computer game on students’ motivation and aggression. The quasi-experimental method has been selected as a quantitative method of research. The study group of the research is comprised of 444 7th grade students in total studying in 7 different schools chosen from each region of Turkey. In this context, while there is no interference in one of the two 7th grade classrooms from each school, the other is sustained with a computer game as an additional material to the teaching process. The application proceeded through 2014-2015 academic year. Motivation towards Science and aggression scale have been applied to all groups three times; at the beginning of the first term, at the b...

Yemler Bilgisi Yem Teknolojisi ve Balık Besleme

Bilgüven, Murat

Her havuz alanında ya da yetiştirme biriminden elde edilen balık ve dolayısıyla balık yetiştiriciliğinin kârlılığı, büyük ölçüde kullanılan yemin miktarına bağlıdır. Su ürünleri sistemi ne kadar yoğun olursa yemlemenin önemi o kadar fazla olur ve toplam üretim maliyetinde yem maliyetinin payı da o kadar artar. Bilindiği üzere alabalık başta olmak üzere bazı balıkların yetiştiriciliği için akarsu sistemli tesisler kullanılmakta yada sıcaklığın, su bileşiminin ve akıntının dolayısıyla oksijen yoğunluğunun daha iyi olduğu tatlı su ve kıyılarda ise yüzer ağ kafeslerde yetiştiricilik yapılmaktadır. Su ürünleri yetiştiriciliğinin ileri durumda olduğu ülkelerde entansif yetiştiricilik uygulanmakta ve yetiştirme alanlarında birim hacimde maksimum ürün yetiştirilmeye çalışılmaktadır. Bu tür yetişti...

THE EFFECT OF THE COMPUTER GAME DEVELOPED FOR THE 7TH GRADE SCIENCE LESSON, ON STUDENT’S SELF-EFFICACY TOWARD SCIENCE

Say, Fuat Serkan

Sınıf Öğretmen Adaylarının Fene, Fen Eğitimine ve Teknolojiye Karşı Tutumlarının Değerlendirilmesi

Say, Fuat Serkan