Antioxidative Enzyme Activity, Lipid Peroxidation, and Proline Accumulation in the Callus Tissues of Salt and Drought Tolerant and Sensitive Pumpkin Genotypes under Chilling Stress

Sebnem Kusvuran,Sebnem Ellialtioglu,Zehra Polat 한국원예학회 2013 Horticulture, Environment, and Biotechnology Vol.54 No.4

In this study, the effects of chilling stress were studied on 2 salt- and drought-tolerant and 2 sensitive pumpkin genotypes in callus culture. Growth inhibition occurred in the callus tissues when exposed to 4°C for 8days. The tolerant genotypes showed lower increase in lipid peroxidation and a greater increase in superoxide dismutase,catalase, ascorbate peroxidase, and glutathione reductase than the tolerant genotypes under stress conditions. The proline,glucose, and fructose contents continued to increase with progression in the chilling in the pumpkin genotypes. However, this increase was more significant in the tolerant genotypes than in the sensitive ones. These results indicate that chilling stress leads to the production of reactive oxygen radicals, resulting in increased lipid peroxidation and oxidative stress in pumpkin genotypes. The increase of antioxidant enzyme activities is associated with a tolerance to chilling stress.

Clinical gap changes after porcelain firing cycles of zirconia fixed dentures

Sebnem Begum Turker,Bugurman Burcu Bugurman 대한치과보철학회 2014 The Journal of Advanced Prosthodontics Vol.6 No.3

PURPOSE The aim of this study was to measure the changes on the marginal and internal adaptation of zirconia based anterior fixed partial dentures after the porcelain firing process. MATERIALS AND METHODS A total of 34 anterior fixed partial dentures using LAVA CAD/CAM system (3M ESPE, Germany) were applied. Two silicone replicas were obtained: one is obtained before porcelain firing process (initial) and the other is obtained after porcelain firing process (final), followed by the examination under a binocular stereomicroscope. Kruskal Wallis and Wilcoxon Signed Ranks tests were used for the statistical analysis (P<.05). RESULTS No statistically significant difference was found between initial and final marginal gap values (P>.05). At the internal gap measurements, final marginal area values (59.54 µm) were significantly lower than the initial marginal area values (68.68 µm)(P<.05). The highest and the lowest internal gap values were observed at the incisal/occlusal area and at the marginal area, respectively. In addition, lower internal gap values were obtained for canines than for central incisors, lateral incisors and premolars at the incisal area (P<.05). CONCLUSION The firing cycles did not affect the marginal gap of Lava CAD/CAM system, but it is controversial for the internal gap.

Fracture resistance of endodontically treated canines restored with different sizes of fiber post and all-ceramic crowns

Sebnem Begum Turker,Hasan Necdet Alkumru,Buket Akalin 대한치과보철학회 2016 The Journal of Advanced Prosthodontics Vol.8 No.2

PURPOSE The aim of this study was to determine the fracture resistance and the mode of fracture of endodontically treated teeth restored with different fiber posts and all-ceramic crowns. MATERIALS AND METHODS Two glass fiber reinforced post systems in two different sizes and polyethylene fiber ribbon in two different thicknesses (n=10) were used. The specimens, restored with all-ceramic crowns, were subjected to a compressive load (in N) delivered at a 130-degree angle to the long axis until a fracture could be noted. The results were analyzed statistically with a One-Way ANOVA test (P<.05). RESULTS Statistically significant differences were observed between the mean fracture resistance values of Postec, Snowlight, and Kerr Connect thin specimens (P<.0095). The Postec results (395.70 N) were found to be significantly higher than the others. No statistical difference was observed among the thick specimens (P<.2657). The mean fracture resistance values of the Snowlight thick samples were found to be higher than those of the Snowlight thin samples. The specimens were always fractured around the cemento-enamel junction at the palatinal side. No post fracture was observed for the thin Snowlight and Kerr Connect specimens or for the thick Postec and Kerr Connect specimens. Among the common failure types of the specimens, the worst was observed to be the root fracture failure. The highest post dislodgement failure result (80%) was obtained from the thin Kerr Connect specimen. CONCLUSION In terms of optimizing fracture resistance, the fiber post size selection should be done according to the forces applied to the restored teeth.

Morphological similarity of a tri-block copolymer processed at ambient and elevated temperatures

Sebnem Inceoglu,Taner Aytun,Yusuf Z. Mencelo lu,lhan Özen,Metin H. Acar 한국유변학회 2012 Korea-Australia rheology journal Vol.24 No.4

We investigated the effect of temperature on the morphology of a tri-block copolymer (BCP) processed in a capillary rheometer. The material used was a polystyrene-b-poly(2-ethylhexyl acrylate)-b-polystyrene (PS-b-PEHA-b-PS) tri-block copolymer, which was synthesized by ATRP with a molecular weight of 38.5 K consisting of 49 molar % PEHA. According to the rheological data obtained with dynamic viscoelastic oscillatory measurements, order-disorder temperature (ODT) of the BCP was measured at around 110oC. Considering this observation, the samples were studied under different temperatures and pressures (from 110°C to 28°C and from 48 to 75 bar) in capillary rheometer. All processed materials were characterized by using differential scanning calorimetry (DSC) and atomic force microscopy (AFM). It was found that all samples processed by aid of either temperature or pressure showed similar mixed morphologies (a mixture of the ordered and disordered structures i.e., the reduction of microphase separation due to processing).

Effects of staining liquids and finishing methods on translucency of a hybrid ceramic material having two different translucency levels

Sebnem Ulviye Buyukkaplan,Mehmet Mustafa Ozarslan,Cagatay Barutcigil,Merve Arslan,Kubilay Barutcigil,Elif Ece Yoldan 대한치과보철학회 2017 The Journal of Advanced Prosthodontics Vol.9 No.5

PURPOSE. Beverages may affect the translucency of esthetic dental restorative materials. The aim of the present study was to investigate the effects of coffee and red wine on the translucency of a PICN material with two translucency levels, and finished with different methods. MATERIALS AND METHODS. 2M2 high translucent and translucent VITA Enamic hybrid ceramic blocks were investigated. Rectangular specimens with the dimensions of 12 mm × 14 mm × 2 mm were prepared. The specimens were finished and polished with different methods as suggested by the manufacturer. The translucency parameters of the specimens were evaluated before and after 24 hours, 7 days, and 28 days immersion in distilled water, coffee and red wine. Translucency parameters were measured using a portable spectrophotometer. RESULTS. At the end of 28 days, there was no statistically significant difference between the groups of specimens kept in coffee (P>.05). In the red wine groups, there was a statistically significant difference between the control group and all other groups (P<.05) at the end of 28 days. CONCLUSION. The translucency of hybrid ceramic for a restoration may not be important regarding the effects of coffee on translucency change because the specimens with different translucencies and finishing methods that were immersed to coffee had similar translucency parameters at the end of 28 days. The translucency of hybrid ceramic may be important in the case of red wine, however, since the results showed that highly translucent specimens exposed to red wine demonstrated better translucency parameters than specimens made from translucent blocks at the end of 28 days.

Adsorption Isotherms and Kinetics of Amyloglucosidase / β-Cyclodextrin - Chitosan

(Sebnem Harsa) 한국키틴키토산학회 2000 한국키틴키토산학회지 Vol.5 No.3

The relationship between left ventricular mass index and body composition in new-diagnosed hypertensive patients

Sebnem Karakan,Bekir Inan 대한고혈압학회 2015 Clinical Hypertension Vol.21 No.23

Background: Cardiovascular disease (CVD) is considered a public health burden and most common cause of mortality in all over the world. The latency time for developing CVD may be several decades. the objective of this study was to examine the relationship between body composition and Left Ventriculare Mass Index (LVMI) in newly diognosed hypertensive patients. Methods: We enrolled 120 new-diagnosed hypertensive patients (mean age 45 ± 8 years) who admitted to our nephrology clinic. Body fat percentage (BFP) was measured by bioelectrical impedance (BIA). Echocardiography examinations were performed for all patients. Results: Mean values of Waist hip ratio, Body mass ındex, Body fat percentage, Systolic blood pressure, Diastolic blood pressure were significantly higher for females than males (all p values <0.05). The female patients had higher LVMI than male patients (94.8 ± 13.1 vs 89.2 ± 14.6, p < 0.05). The study patients were divided into 3 groups according to their BFP defined by BIA. Group 3 patients, who exhibited higher body fat, had significantly higher BMI (p < 0,05), total leukocyte count (p < 0.05), CRP (p < 0.05), triglyceride (p < 0.05), and female predominance. Group 3 patients were statistically older than group 1 patients (46.2 vs. 40.6 years, p < 0.05). Additionally, LVMI levels were higher in Group 3 than Group 1 (p < 0.05) (Table 3). In logistic regression analysis, independent factors affecting LVMI were age, weight, gender and BFP (all p values were <0.05). Conclusions: BFP was associated with higher LVMI, in newly diognosed hypertensive patients. Its use results in significantly lower proportions of individuals with LVH in the population, in particular among hypertensive and the obese patients.

Reversible Thermochromic Polycaprolactone Nanofibers for Repetitive Usage

Sebnem Duzyer Gebizli,Nihal Guclu,Mehmet Tiritoglu,Serkan Tezel,Mehmet Orhan 한국섬유공학회 2023 Fibers and polymers Vol.24 No.10

Color change technology offers unique and challenging opportunities. Thermo-responsive color-changing nanofibers with reversibility have great potential as thermal sensors due to their increased sensitivity and fast response. Herein, polycaprolactone (PCL) nanofibers were produced by adding a leuco-based thermochromic dye with various concentrations (1%, 3%, and 5% wt corresponding to PCL1, PCL3, and PCL5, respectively). The color-changing properties with repetitive heating and cooling were studied, and the effect of dye concentration on the nanofiber properties was determined. The surface properties, dye presence, thermal and mechanical properties were analyzed by SEM-EDS, FTIR, DSC, and tensile tests. Finally, the color change properties were monitored by 1000 heating and cooling cycles between 20 and 40 °C. Thermochromic PCL nanofibers were successfully produced by electrospinning. However, some agglomerates were observed on the nanofibers with increasing dye concentration in SEM images. It was seen that the optimum dye concentration was 3% in terms of the electrospinnability. For PCL5, both presence of carbon, oxygen, nitrogen, and fluorine in EDS spectra, the shifted peaks at 2917 and 2849 cm-1, and the new peaks at 1558, 1517, 1330, 1274, 1213 and 883 cm-1 in FTIR spectra confirmed that dye had been successfully incorporated into the PCL structure. The dye addition caused a decrease in the crystallization degrees, which resulted in lower mechanical properties. PCL5 had the lowest modulus. Color measurements showed that 1% of dyes concentration was not sufficient for the thermochromic property, and the color change was still visually detectable for PCL3 and PCL5 even after 1000 heating and cooling cycles. Color change activation temperature (TA) was confirmed between 30 and 32 °C, and the stability of color change was confirmed for 1000 heating and cooling cycles. After 1000 heating and cooling cycles, the color change was still detectable for PCL3 and PCL5. Consequently, this study showed that reversible thermochromic PCL nanofibers could be promising materials for future sensor applications.

Religious conversions in forced migration: Comparative cases of Afghans in India and Iranians in Turkey

Sebnem Koser Akcapar 한양대학교 아태지역연구센터 2019 Journal of Eurasian Studies Vol.10 No.1

This article examines closely the crucial link between religious conversions of two groups of refugees from Islam to Evangelism by taking up the cases of Afghan and Iranian refugees in India and in Turkey, respectively. India hosts many refugees from different parts of the world despite the absence of international protection laws, whereas Turkey is the country hosting the highest number of refugees since 2015, mainly due to the Syrian conflict. In this article, I first analyze the reasons why Afghan and Iranian refugees decide to change religious group membership from different sects of Islam and become members of the “born-again” evangelical Christian groups operating in South Asia and West Asia. By combining forced migration and religious identity issues in two different settings, I suggest that a combination of contextual and institutional factors explain this religious change and help us understand the sociocultural and political impacts of conversions.

Awareness of Turkish Female Adolescents and Young Women about HPV and their Attitudes Towards HPV Vaccination

Ozyer, Sebnem,Uzunlar, Ozlem,Ozler, Sibel,Kaymak, Oktay,Baser, Eralp,Gungor, Tayfun,Mollamahmutoglu, Leyla Asian Pacific Journal of Cancer Prevention 2013 Asian Pacific journal of cancer prevention Vol.14 No.8

Background: The aim of the study was to assess the knowledge about HPV and HPV vaccines and attitudes towards vaccination among the females aged 9-24 years in Turkey. Materials and Methods: Self-administered questionnaires were filled out individually by the participants covering demographic information, knowledge about HPV infection and HPV vaccines, attitudes towards vaccination, and the perceptions of them about their parental attitudes about vaccination. Results: Of the 408 subjects participating in the study, 41.6% (n=170) had heard of HPV. Thirty-three percent (n=136) knew the causal relationship between HPV and cervical cancer. Only 27.9% (n=114) of them knew that HPV vaccines can prevent cervical cancer. Eleven percent (n=46) of the females participating in the study were willing to be vaccinated, and only 1.4% (n=6) were already vaccinated at the current time. The main reason listed among the participants who were not willing to be vaccinated was lack of information. Conclusions: Awareness and knowledge of Turkish female adolescents and young women about HPV, relation with cervical cancer and prevention of cervical cancer by Pap smear and vaccine are still limited. If the most important barrier to vaccination, which is reported as lack of information, were to be addressed, it would greatly impact the decision-making and vaccine acceptance.