Exploring Effects of High School Students’ Mathematical Processing Skills and Conceptual Understanding of Chemical Concepts on Algorithmic Problem Solving

The purpose of the study was to examine the effects of students’ conceptual understanding of chemical concepts and mathematical processing skills on algorithmic problem-solving skills. The sample (N = 554) included grades 9, 10, and 11 students in Turkey. Data were collected using the instrument “MPC Test” and with interviews. The MPC Test consists of 3 sections: 8 conceptual questions (Qcu), 8 algorithmic problems (Qcc), 8 mathematics questions (Qm). It was concluded that students’ conceptual understanding and mathematical processing skills effected algorithmic problem-solving skills. The effects of conceptual understanding were much more than mathematical processing skills on algorithmic problem-solving skills. According to the MCT Test results, 10 students with high, average, and low grades were interviewed. Qualitative findings were consistent with quantitative results. There is a significant relationship between students’ algorithmic skills and their mathematical skills. Also, it was concluded that students’ conceptual understandings are effective on solving chemistry problems but solving chemistry problems correctly does not mean chemistry concepts can be understood truly and deeply on a molecular level

VISUOMOTOR AND AUDIOMOTOR REACTION TIME IN ELITE AND NON-ELITE BADMINTON PLAYERS

The ability to quickly perceive appropriate motor response is essential in the badminton sport under the critical time pressure. This study aimed to evaluate the visual and auditory reaction time, speed, anaerobic power and vertical jump between elite and non-elite badminton athletes. With this purpose, various anthropometric measurements, hexagonal obstacle test, vertical jump test, anaerobic power measurement and auditory and visual reaction time tests were performed to the elite and non-elite athletes. When auditory reaction time, vertical jump and anaerobic power measurements were evaluated, there was no significant difference between the elite and non-elite groups, but it was noticed that there was a significant differences in quickness and visual reaction time in favor of elite athletes. It is also seen that speed and visual reaction time have a positive effect on badminton athletes are able to get to the high performance level in other literature information. For this reason, it has been thought that training programs designed for badminton athletes by considering these physiological parameters and training systems designed to increase the reaction time may be beneficial.  Article visualizations

Examining the Reliability and Validity of a Turkish Version of the Community of Inquiry Survey

WOS: 000437146600010The aim of this study was to describe the validity and reliability of a Turkish language version of the CoI survey developed by Arbaugh et al. (2008). Data were obtained from 1150 students enrolled in online courses in various departments in three Turkish state universities. The data were randomly divided into two parts: the first part was subjected to exploratory factor analysis; the second part underwent confirmatory factor analysis. A three-factor structure of the CoI framework explained 75.28% of the variance in the pattern of relationships among the items using the first split-half sample. All three presences had high reliabilities (teaching presence=.965, social presence=.953, and cognitive presence=.972). The three-factor structure of the CoI framework with teaching, social, and cognitive presences confirmed the validity of the Turkish version of the CoI survey

Voice and Quality-of-Life Outcomes of Diode Laser for Tis-T1a Glottic Cancer

WOS: 000529182700008PubMed: 31012346The aim of this prospective study was to analyze the voice and quality-of-life outcomes of microscopic diode laser surgery (MDLS). The study was conducted on a series of 46 patients with Tis-T1a glottic carcinoma treated with microscopic endolaryngeal diode laser surgery. Patients were asked to complete the Voice Handicap Index and quality-of-life questionnaires of the European Organization for Research and Treatment of Cancer. When comparing the pre- and postoperative scores, there were significant difference on the physical scores (P = .014) of the patients who underwent type III cordectomy and functional (P = .022), emotional (P = .002), and overall scores (P = .005) of the patients who underwent type IV cordectomy, in the direction of better quality of voice after MDLS. The postoperative functional, physical, emotional, and overall scores of groups were significantly increased with the extension of resection

The impact of oral anticoagulation on false lumen patency in acute type A aortic dissections

WOS: 000439420000001Background: In this study, the effect of postoperative oral anticoagulation on the false lumen patency of the distal aorta in patients with acute type A aortic dissection was investigated. Methods: Forty-one patients (32 male, 9 female; mean age 56.8 +/- 13.6 years; range, 30 to 84 years) who were diagnosed with acute type A aortic dissection and underwent surgical treatment in our clinic, and whose entire data of both control computed tomographic assessments and all postoperative follow-up visits could be accessed were enrolled. The patients were divided into two groups according to the type of surgical intervention that was performed. Computed tomography imaging of the patients were scanned and false lumen patency rates were evaluated. Besides oral anticoagulation, preoperative, intraoperative, and postoperative risk factors that may have affected false lumen patency secondary to acute type A aortic dissection were evaluated and statistically analyzed. Results: Twenty-one patients (51.2%) had concomitant hypertension. Thirty five (85.4%) of the patients had the main symptom of angina. Sixteen patients (39%) in Group 1 underwent ascending aortic replacement combined with aortic valve replacement (Bentall procedure); while 25 patients (61%) in Group 2 underwent isolated ascending aortic replacement. Mean follow-up was 43.9 +/- 26.3 (range: 5-120) months. No statistically significant difference was found between the study subgroups in any of the operation parameters except for cardiopulmonary bypass time (p=0.035) and cross-clamp time (p=0.002). Evaluation of the control contrast-enhanced tomographic imaging of the patients showed false lumen patency in the thorax in 34 patients (82.9%) and in the abdominal region in 33 patients (80.5%). When analyzing subgroups according to the type of surgical procedure, or indirectly anticoagulant use, no statistically significant difference was found in false lumen patency prevalence between the thoracic and abdominal groups (p=0.534 and p=0.922). Conclusion: No potential effect of postoperative anticoagulation on false lumen patency was found in cases with acute type A aortic dissection

Prevalence and genotypes of hepatitis G virus among hemodialysis patients in Eastern Anatolia, Turkey

Objectives: To study the prevalence and genotype distribution of hepatitis G virus (HGV) in hemodialysis patients in East Anatolia, Turkey. Subjects and Materials: Eighty-nine hemodialysis patients and 30 healthy individuals were analyzed by using reverse-transcriptase nested polymerase chain reaction with primers specific for 5' untranslated region. HGV genotyping was performed by PCR and three randomly selected HGV-positive samples were sequenced. Results: Of the 89 hemodialysis patients, HGV RNA was detected in 9 (10.2%). All of our isolates were assigned to genotype 2. Conclusion: Our results showed that hemodialysis patients carry the risk for HGV infection in East Anatolia, Turkey. Copyright (C) 2005 S. Karger AG, Basel

Video head impulse test in children with otitis media with effusion and dizziness

SENCAN, Ziya/0000-0002-0936-5108; SIMSEK, GOKCE/0000-0001-5281-0986WOS: 000509613300033PubMed: 31760334Objective: The objectives of the study were to evaluate the vestibular impairment in children with otitis media with effusion (OME) and dizziness by using vHIT test, and to compare their results with healthy children. Methods: The study population consisted of 30 pediatric patients with OME and dizziness and 30 healthy children, age between 4 and 15. Otoscopic and tympanometric examination and vHIT testing were performed to all subjects. vHIT test parameters were compared between pediatric patients with OME and dizziness and healthy children. Additionally, the differences of the mean vHIT gains between tympanogram types, otoscopic findings and the presence of saccades were analyzed. Results: The mean vHIT gains and gain asymmetry values of patients with OME and dizziness and healthy children were comparable. No significant difference was observed between the mean vHIT gains of patients with type B and type C2 tympanogram. Covert saccades were observed in 57% of the patients with OME and dizziness. None of the patients had over saccades and none of the healthy children had saccades. Conclusion: Our study is a preliminary study analyzing the vestibular impairment in children with OME and dizziness using vHIT test. Based on our results, it can be assumed that the children with OME and dizziness usually don't have a great vestibular impairment that can be detected with vHIT test. The covert saccades detected in this patient group are accepted as a sign of slight vestibular impairment

Relationship between static and cyclic front to back load capacity of wooden chairs and evaluation of the strength values according to acceptable design values

Tests were carried out to investigate the relationship between static and cyclic strength of wooden chairs. Furthermore, cyclic front to back load performance of chairs were compared with acceptable design loads that were given in the American Library Association (ALA) specifications. For this purpose, 90 chair frames were constructed of Turkish beech (Fagus orientalis L.) with round edge mortise and tenon joints, with tenons that varied from 30, 40, and 50 mm in width and 30, 40, and 50 mm in length. All joints were assembled with 65% solid polyvinyl acetate adhesive. Half of the chairs were subjected to “cyclic” loads and the other half were subjected to “static” loads based on the ALA specifications. In conclusion, it was recommended that the cyclic strength could be taken as the 56% of the static strength. According to the results, the chairs constructed with any size of tenons could meet the light-duty service (domestic usage), except for the chairs constructed with 30 by 30 mm tenons. The chairs constructed with 50 by 50 mm tenons could meet the heavy-duty service, whereas the chairs constructed with 30 by 50 mm tenons could meet the medium-duty service

The contributions of virtual colonoscopy to laparoscopic colorectal surgery

Background/Aims: Operative tumor or polypectomy site localization and synchronous colonic lesions are challenging problems especially in laparoscopic surgery. We designed this prospective study to determine the contributions of virtual colonoscopy to laparoscopic colorectal surgery

Effect of Femtosecond Laser Treatment on the Shear Bond Strength of a Metal Bracket to Prepared Porcelain Surface

Objective: The aim of this study was to investigate the effects of femtosecond laser treatment (Group FS) on the shear bond strength (SBS) of a metal bracket to prepared porcelain surface, and to compare it with other surface treatment techniques [50 mu m Al2O3 sandblasting (Group SB), 9.6% hydrofluoric acid gel (Group HF), and neodymium-doped yttrium aluminium garnet (Nd:YAG laser) (Group NY)]. Background data: Because of the increasing number of adult patients in current orthodontic practice, achieving sufficient bond strength of composite resin to porcelain restorations without bond failure during the treatment is a challenge for orthodontists. Methods: In total, 80 glazed feldspathic porcelain samples were prepared and randomly assigned to four groups of 20. Treated surfaces were treated with a silane agent. Brackets were bonded to porcelain samples. The specimens were stored in distilled water for 24 h and then thermocycled for 500 cycles between 5 degrees and 55 degrees C. The SBS of the brackets was tested with a universal testing machine at a crosshead speed of 1 mm/min, until bonding failure occurred. The data were analyzed statistically using analysis of variance (ANOVA) and Tamhane multiple comparisons tests. The results of ANOVA indicated that the SBS values varied according to the surface treatment method (p<0.001). Results: Results of the Tamhane post-hoc tests indicated that the bond strength in Group NY (5.11 +/- 1.53) was significantly lower than the other groups (p<0.05). There were no statistically significant differences among Groups SB (9.07 +/- 3.76), HF (9.09 +/- 3.51), and FS (11.58 +/- 4.16) (p=0.28). Conclusions: The results of this study showed that FS treatment produced high SBS of the processes assessed; therefore, it appears to be an effective method for bonding orthodontic metal brackets to prepared porcelain surfaces