Güncel Gönderiler: Matematik ve Fen Bilimleri Eğitimi-Makale Koleksiyonu
Toplam kayıt 658, listelenen: 181-200
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Diterpenoid and phenolic contents of Sideritis hololeuca Boiss & Heldr. Apud Bentham with antioxidant and anticholinesterase activity
(Walter De Gruyter GMBH, 2020)The objective of this study is to determine essential oil, diterpenoid and phenolic contents of Sideritis hololeuca along with their biological activities. Phytol was found to be the main component of the essential oil. ... -
Homoploid hybrids of Origanum (Lamiaceae) in Turkey: morphological and molecular evidence for a new hybrid
(Taylor and Francis Ltd, 2020)In this study, three hybrids of Origanum (Lamiaceae) were examined in detail using morphological, karyological, palynological and molecular approaches. One of the three hybrids, O. x aytacii, is here described for the first ... -
History-based instruction enriched with various sources of situational interest on the topic of the atom: the effect on students' achievement and interest
(Springer, 2020)This study examines the effect of history-based instruction on the topic of the atom on students' academic achievement and their interest in the history of science, investigating as well the relationship between student ... -
Power and free normal subgroups of generalized Hecke groups
(World Scientific Publ Co Pte Ltd, 2020)Let p and q be integers such that 2 <= p <= q, p + q > 4 and let H-p,H- q be generalized Hecke group associated to p and q. Generalized Hecke group H-p,H- q is generated by X(z) = -(z - lambda(p))(-1) and Y(z) = -(z + ... -
Ent-kaurene diterpenoids from sideritis lycia with antiviral and cytotoxic activities
(ACG Publications, 2020)The genus Sideritis (Lamiaceae) is represented by 45 species (54 taxa) in Anatolia with high endemism ratio (74%), and Turkey is one of the gene centers of the genus along with Spain. Acetone extract of the aerial parts ... -
Redesigning the bean seed germination experiment: an activity sheet suggestion
(Routledge Journals, 2020)Germinating a seed is presumably the first experiment made by a child in his life. So, it has an important place both in child's scientific experience and understanding. Despite the significance of the experiment, the ... -
The determination of buried magnetic material from various heights: A neural network application
(IEEE-Inst Electrical Electronics Engineers Inc, 2020)This article aims at determining the anomalies created by buried magnetic materials on the horizontal component of earth's magnetic field through the KMZ51 anisotropic magnetoresistive sensor (AMR) series and determining ... -
Video-based instruction on safety rules in the chemistry laboratory: its effect on student achievement
(Royal Soc Chemistry, 2020)This study explores the effect of video-based instruction on the safety rules in the chemistry laboratory on student achievement. The sample for the study comprised 61 ninth grade students enrolled in two different classes ... -
Studies to ıncrease barrel exit velocity for four-stage coil-gun
(IEEE-Inst Electrical Electronics Engineers Inc, 2020)The operating principle for electromagnetic launchers (EMLs) is based on electromagnetic theory. The process in EMLs involves the creation of a varying or moving strong electromagnetic field, and ensuring movement of the ... -
Effect of aqueous extract, hydrosol, and essential oil forms of some endemic Origanum L. (Lamiaceae) taxa on polyphenol oxidase activity in fresh-cut mushroom samples
(Wiley, 2020)OriganumL. is one of the high-value medicinal and aromatic plants generally used for various purposes in the field of food and health. This study evaluated the effect of aqueous extract, hydrosol and essential oil forms ... -
Exploring on-campus and in real school classroom microteaching practices: the effect on the professional development of preservice teachers
(Springer, 2020)The aim of this study was to determine the professional developments of science teacher candidates over 14 weeks of microteaching practices. The sample for the study was comprised of 9 teacher candidates aged 21-23 who ... -
Virtual water: Production processes and the use of water
(Routledge Journals, 2020)Virtual water is the amount of water that we ignore in water consumption and is considerably higher than the visible water we see in daily uses. Realizing the water spent in the production processes of objects can cause ... -
A prickly puzzle: Generic delimitations in the Carduus-Cirsiumgroup (Compositae: Cardueae: Carduinae)
(Wiley, 2020)Generic delimitations within the cosmopolitanCarduus-Cirsiumgroup (i.e., "thistles") have a long history of taxonomic confusion and debate. We present the most comprehensive molecular phylogeny of the group to date to test ... -
The secondary school biotechnology knowledge test (SBKT)
(Dergipark Akad, 2020)The science of biotechnology is essential for the future of societies. That's why every individual in society needs accurate biotechnology knowledge to associate it with their daily lives. Based on this requirement, the ... -
Mericarp morphology of the genus Origanum (Lamiaceae) and its taxonomic, significance in Turkey
(Magnolia Press, 2020)Origanum is a well-known genus that is widely distributed and comprises many hybrids and endemic species in Turkey. Some morphological and molecular studies in the literature have aimed to clarify infrageneric or sectional ... -
The effects on antioxidant enzymes of PMMA/hydroxyapatite nanocomposites/composites
(Elsevier Sci Inc, 2020)In this study, polymer-ceramic nanocomposites and/or composites were prepared by solution removal method using poly(methylmethacrylat) (PMMA) and nano-hydroxyapatite (nHA). They were characterized using X-ray diffraction ... -
Two new taxa of Hypericum (Hypericaceae) from Turkey
(Springer London Ltd, 2019)Two new taxa of Hypericum are described from Turkey - H. cuisinii Barbey subsp. anatolicum Dirmenci & N.Robson from Aydin province and H. kemaliyensis Dirmenci & N.Robson from Erzincan province, and their relationships are ... -
Synthesis, structural characterization, spectroscopic properties, and theoretical investigation of siderol acetate
(Maik Nauka, 2019)In the present study, siderol acetate (1) was synthesized from siderol isolated from endemic Sideritis species, then its chemical structure was determined by using various spectroscopic methods (FT-IR, H-1 NMR, and C-13 ... -
Design and optimization of delphi-based electromagnetic coilgun
(IEEE-Inst Electrical Electronics Engineers Inc, 2019)In classical gun and satellite launching systems, noise, flame, and hazardous gasses occur during the explosion of gunpowder, and it is possible to change the muzzle velocity of projectile only during the production phase. ... -
An application of BRANN and MFL methods: Determining crack type and physical properties on M5 steel sheets
(Elsevier Sci Ltd, 2019)Magnetic flux leakage (MFL) method is used frequently in researches on cracks on ferromagnetic materials. Recent studies on this method focused on the improvement of low power consumption and sensor sensitivity. Generally, ...
