Preservice Teachers' Attitudes and Metaphor Perceptions towards Mathematics

WOS: 000449004100020In this study, preservice teachers' attitudes and metaphor perceptions towards mathematics were examined, the relationship between them was investigated and it was determined whether there was a significant difference according to the departments. In this context, in the 2015-2016 academic year, 358 preservice teachers in central Turkey were administered various scales such as "Mathematics attitude scale" ","Personal information form", and "Mathematics is like ..., because ..." and "If a mathematical movie genre (weather conditions) ..., it would be, because ... ". Content analysis was used in the analysis of the qualitative data. Spearman correlation test, Kruskal Wallis-H test and Mann Whitney-U test were used in the analysis of the quantitative data. As a result of the analysis, it has been recognized that the metaphors towards mathematics are divided into the conceptual categories as "Entertainment", "Basic need" "Emotion" and "Problem". There was a positive and strong significant relationship between the attitudes and metaphor perceptions towards mathematics of preservice teachers. Moreover, attitudes and metaphor perceptions towards mathematics were found to differ significantly according to the departments. Furthermore, this study has found that research with more than one metaphor is more effective

Light-emitting diode photobiomodulation: effect on bone formation in orthopedically expanded suture in rats-early bone changes

The aim of this experimental study was to evaluate histomorphometrically the effects of light-emitting diode (LED) photobiomodulation therapy (LPT) on bone formation in response to expansion of the interpremaxillary suture in rats. Twenty male, 50- to 60-day-old Wistar rats were divided into two equal groups (control and experimental). Both groups were subjected to expansion for 5 days, and 50 cN of force was applied to the maxillary incisors with helical spring. An OsseoPulseA (R) LED device, 618-nm wavelength and 20-mW/cm(2) output power irradiation, was applied to the interpremaxillary suture for 10 days. Bone formation in the sutural area was histomorphometrically evaluated, including the amount of new bone formation (in square micrometers), number of osteoblasts, number of osteoclasts, and number of vessels. Mann-Whitney U test was used for statistical evaluation at p < 0.025 level. Significant differences were found between groups for all investigated histomorphometric parameters. New bone formation area (p = 0.024, 1.48-fold), number of osteoblasts (p < 0.001, 1.59-fold), number of osteoclasts (p = 0.004, 1.43-fold), and number of vessels (p = 0.007, 1.67-fold) showed higher values in the experimental group than the control. Bone histomorphometric measurements revealed that bone architecture in the LPT group was improved. The application of LPT can stimulate bone formation in the orthopedically expanded interpremaxillary suture during expansion and the early phase of the retention periods

Copper(II) and palladium(II) complexes of 2-amino-5-chlorobenzophenone and 2-(2-hydroxybenzylidene)amino-5-chlorobenzophenone-S-methyl-thiosemicarbazones

The S-methyl thiosemicarbazone derivatives of 2-amino-5-chlorobenzophenone and 2-(2-hydroxybenzylidene) amino-5-chlorobenzophenone (L-I and L-II) and their copper(II) and palladium(II) chelates were synthesized. The solid compounds, [Cu( L-I) Cl]Cl center dot 2H(2)O, [Cu( L-II)Cl]Cl center dot H2O, [Pd(L-I) Cl]Cl, and [Pd(L-II)Cl-2], were characterized by elemental analysis, thermogravimetric measurements, electronic, i.r., H-1-n.m.r. and e.p.r. spectroscopy. The ligand behavior of the L-I and L-II explained by means of spectroscopic data. The experimental X-band e.p.r. spectra recorded from two different copper(II) ion coordinated powder complexes have characteristic line shapes that exhibit the axial symmetry around the paramagnetic ions. The theoretically well fitted spectra prove this case too. The absence of hyperfine signals has been attributed to the strong covalency effects of copper electrons with neighbouring N atoms. Orbital energy levels for magnetic electrons were determined from Spin Hamiltonian parameters. The anisotropic Lande splitting factors were specified in an order of g parallel to > g perpendicular to > 2 and this case indicates that the unpaired electrons are located mainly in the d(x2-y2)orbital

Determinants for poor perinatal outcome in term pregnancies with umbilical cord prolapse

© 2022 Ondokuz Mayis Universitesi. All rights reserved.Umblical cord prolapse is a very rare condition. It is an obstetric emergency that can have unfavourable consequences for the fetus. We aimed to investigate the determinants for poor perinatal outcome following emergency cesarean delivery performed due to umbilical cord prolapse in uncomplicated term pregnancies. Fifty-three term pregnants and their babies born with cesarean section due to umbilical cord prolapse were included in this retrospective study. Newborns who were taken to neonatal intensive care unit were defined as poor perinatal outcome.Eleven of fifty-three newborns needed intensive care. All of them were discharged without any problem after the treatment. The presence of fetal distress detected before or during the umbilical cord prolapse was found to be the only marker associated with poor perinatal outcome. Abnormalities detected in fetal heart rate monitoring before or during umblical cord prolapse increase poor perinatal outcome in uncomplicated term pregnancies

Characterization of differentially expressed genes to Cu stress in Brassica nigra by Arabidopsis genome arrays

Phytoremediation is an efficient and promising cleanup technology to extract or inactivate heavy metals and several organic and inorganic pollutants from soil and water. In this study, different Brassica nigra L. ecotypes, including Diyarbakr, collected from mining areas were exposed to different concentrations of copper and harvested after 72h of Cu stress for the assessment of phytoremediation capacity. The Diyarbakr ecotype was called as metallophyte because of surviving at 500M Cu. To better understand Cu stress mechanism, ArabidopsisATH1 genome array was used to compare the gene expression in root and shoot tissues of B. nigra under 25M Cu. The response to Cu was much stronger in roots (88 genes showing increased or decreased mRNA levels) than in leaf tissues (24 responding genes). These genes were classified into the metal transport and accumulation-related genes, signal transduction and metabolism-related genes, and transport facilitation genes. Glutathione pathway-related genes (-ECS, PC, etc.) mRNAs were identified as differentially expressed in root and shoot tissues. QRT-PCR validation experiments showed that -ECS and PC expression was upregulated in the shoot and leaf tissues of the 100M Cu-subjected B. nigra-tolerant ecotype. This is the first study showing global expression profiles in response to Cu stress in B. nigra by Arabidopsis genome array. This work presented herein provides a well-illustrated insight into the global gene expression to Cu stress response in plants, and identified genes from microarray data will serve as molecular tools for the phytoremediation applications in the future