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Evaluation of Surface Roughness Characteristics Using Atomic Force Microscopy and Inspection of Microhardness Following Resin Infiltration with Icon®

E.B. Gurdogan | D. Ozdemir-Ozenen | N. Sandalli

Article | 2017 | Journal of Esthetic and Restorative Dentistry29 ( 3 ) , pp.201 - 208

Objective: The aim of this study was to evaluate the surface roughness via atomic force microscopy (AFM) as well as to evaluate the microhardness values of Icon® in comparison with sound and demineralized enamel in a large subject group. Materials and Methods: Enamel samples were prepared from sound bovine incisors and randomly allocated into either AFM (n = 60) or microhardness (n = 60) groups. The AFM group was divided into control (n = 30) and Icon® (n = 30) subgroups. The microhardness group was also divided into three subgroups: control (n = 20), demineralization (n = 20) and Icon® (n = 20) groups. The demineralization and Icon . . .® subgroups were subjected to a demineralizing solution (pH: 4, 2 hours). Following the formation of shallow white spot lesions and application of the infiltrant, each sample was examined according to its parameter. Results: AFM images suggested that Icon® had a significantly rougher surface than the control group. When the AFM results were evaluated numerically, it was evident that the Icon® group possessed statistically higher Sa, Sq, mean height, and maximum deviation values compared to the control group. The mean Vickers hardness values of all groups were determined to be significantly different from one another. Hardness values in the demineralization group were determined to be significantly lower than the control and Icon® groups. No statistically significant difference was observed between mean Vickers hardness values for the contol and Icon® groups. Conclusions: The present in vitro study shows that more studies are required to improve the surface quality of this infiltrant material. Clinical Significance: The present in vitro study shows that the resin infiltration technique results in increased microhardness of demineralized enamel. However, it was observed that the infiltrant material creates a significantly rougher surface compared to healthy, untreated enamel. (J Esthet Restor Dent 29:201–208, 2017). © 2016 Wiley Periodicals, Inc Daha fazlası Daha az

Anti-immigration attitudes and the opposition to European integration: A critical assessment

C Kentmen-Cin | C Erisen

Article | 2017 | EUROPEAN UNION POLITICS18 ( 1 ) , pp.3 - 25

The aim of this overview is to critically examine the state of research on the relationship between anti-immigrant attitudes and attitudes toward European integration. We argue that the two most commonly used measures of anti-immigrant attitudes do not fully capture perceived threats from immigrants and opinion about different immigrant groups. Future research should pay more attention to two particular issues: first, scholars could employ methodological techniques that capture the underlying constructs associated with attitudes and public opinion; second, researchers could differentiate between groups within the overall immigrant p . . .opulation. This overview identifies themes in the literature while drawing attention to the need for more research on the behavioral underpinnings of anti-immigrant attitudes and public opinion on European integration Daha fazlası Daha az

Thermal analysis applied for the removal of surfactant from mesoporous molecular sieves MCM-41 synthesized from gold mine tailings slurry

M. Sari Yilmaz | I. Acaroglu Degitz | S. Piskin

Article | 2017 | Journal of Thermal Analysis and Calorimetry130 ( 2 ) , pp.727 - 734

The aim of the current study is to obtain the thermal behavior and kinetic analyses of the removal of surfactant from MCM-41 synthesized from tailings slurry at different heating rates. X-ray diffraction and thermogravimetric analyses were carried out to determine the characterization of the synthesized samples. Kissinger–Akahira–Sunose and Friedman isoconversional kinetic methods were applied for the purpose of determining the kinetic analysis parameters of the decomposition of surfactant from the mesoporous molecular sieves MCM-41 under non-isothermal conditions. For the comparison of these results, MCM-41 was synthesized from a p . . .ure silica source. The thermal behaviors of MCM-41 synthesized from tailings slurry do not differ from samples synthesized from pure silica during the decomposition reactions. The kinetic analysis’ results indicate that the decomposition reactions of the synthesized MCM-41 samples had complex reaction mechanisms. © 2017, Akadémiai Kiadó, Budapest, Hungary Daha fazlası Daha az

An empirical analysis of the change in Turkish foreign policy under the AKP government

Aydın Çakır, A. | Arıkan Akdağ, G.

Article | 2017 | Turkish Studies18 ( 2 ) , pp.334 - 357

The existing literature on Turkish foreign policy (TFP) asserts that under the rule of the Adalet ve Kalkınma Partisi (AKP), Turkey’s foreign policy shifted from caution and uni-dimensionality to relative activism and multi-dimensionality. This study aims to test these arguments through a systematic analysis of the international agreements ratified by the Turkish Parliament between 1984 and 2015. By looking at the number, content and signatory parties of these international agreements, it aims to empirically show the change in the activism, orientation and instruments of TFP. Using this original data set is not only used to trace th . . .e change under the AKP but also across all ruling governments that came to power between 1984 and 2015. © 2016 Informa UK Limited, trading as Taylor & Francis Group Daha fazlası Daha az

A rapid in-house validated GC-FID method for simultaneous determination of lipophilic bioactives in olive oil: Squalene, alpha-tocopherol, and beta-sitosterol

Seçmeler, Ö. | Güçlü Üstündağ, Ö.

Article | 2017 | European Journal of Lipid Science and Technology119 ( 1 ) , pp.334 - 357

The analytical methodologies utilizing HPLC or GC techniques for the determination of predominant lipophilic bioactives in olive oil (ß-sitosterol, squalene, and ?-tocopherol) may include a number of sample pre-treatment steps (such as clean up (using TLC and SPE), saponification, and derivatization) making them rather lengthy and impractical. The objective of this study was to develop a rapid and in-house validated GC-FID method for the simultaneous determination of these bioactives using response surface methodology for optimization of critical parameters (time and temperature of saponification and derivatization). In-house method . . . validation based on method performance parameters (linearity, limit of detection (LOD), limit of quantification (LOQ), repeatability, and recovery) was carried out using optimized method parameters (10 min derivatization time for 30°C derivatization temperature, 56°C saponification temperature, and 10 min saponification time). The linear range of ß-sitosterol, squalene, and ?-tocopherol was determined to be between LOQ value (8.4; 16.0; 12.5 mg/100 g, respectively) and upper end (500; 700 mg/100 g for ß-sitosterol; squalene, respectively) with acceptable accuracy, recovery (92–97%; 93–95%; 93–110%) and repeatability. Practical applications: The in-house GC-FID method developed in this study offers a rapid, accurate and validated method alternative to current official methods and simultaneous methods recently published in the literature. Time of analysis was reduced to ~5 h for every six samples compared to ~20 h specified in official methods. The developed method was fully validated covering all parameters; linearity, LOQ, LOD, recovery, and repeatability. This method can be incorporated into quality control programs for olive oil and its application areas can be expanded to include other plant oils after further validation studies. A new rapid multicomponent in-house validated method was developed to determine predominant lipophilics of olive oil. © 2016 WILEY-VCH Verlag GmbH & Co. KGaA, Weinhei Daha fazlası Daha az

Effects of apelin on reproductive functions: relationship with feeding behavior and energy metabolism

Tekin, S. | Erden, Y. | Sandal, S. | Etem Onalan, E. | Ozyalin, F. | Ozen, H. | Yılmaz, B.

Article | 2017 | Archives of Physiology and Biochemistry123 ( 1 ) , pp.9 - 15

Apelin is an adipose tissue derived peptidergic hormone. In this study, 40 male Sprague–Dawley rats were used (four groups; n = 10). Apelin-13 at three different dosages (1, 5 and 50 µg/kg) was given intraperitoneally while the control group received vehicle the same route for a period of 14 days. In results, apelin-13 caused significant decreases in serum testosterone, luteinizing hormone and follicle-stimulating hormone levels (p < 0.05). Administration of apelin-13 significantly increased body weights, food intake, serum low-density lipoprotein and total cholesterol levels (p < 0.05), but caused significant decreases in high-dens . . .ity lipoprotein levels (p < 0.05). Serum glucose and triglyceride levels were not significantly altered by apelin-13 administration. Significant decreases in both uncoupling protein (UCP)-1 levels in the white and brown adipose tissues and UCP-3 levels in the biceps muscle (p < 0.05) were noted. The findings of the study suggest that apelin-13 may not only lead to obesity by increasing body weight but also cause infertility by suppressing reproductive hormones. © 2016 Informa UK Limited, trading as Taylor & Francis Group Daha fazlası Daha az

Folk medicine in selected towns of the Marmara subregion (Turkey)

Yeşılyurt, E.B. | Şımşek, I. | Tuncel, T. | Akaydın, G. | Yeşİlada, E.

Article | 2017 | Marmara Pharmaceutical Journal21 ( 1 ) , pp.132 - 148

In this study, 263 volunteers residing in the districts of Bilecik-Aşağıköy, Bilecik-Pazaryeri-Büyük Elmalı, Bursa-City Center, Edirne-Keşan-Kozköy, Edirne-Keşan and Edirne-İpsala participated into the research by using the face-to-face oral interview technique and the required information for the research was collected with the help of a questionary. In the light of the data taken from the survey, parts of the plants that are used as household remedy, aim of the usage and pattern of the preparation (decoction, infusion, poultice, ointment etc.) were documented inquisitively. All collected plant materials have been identified and de . . .posited at the Herbarium of Faculty of Education of Hacettepe University (HEF). In this study, 68 taxa belonging to 33 families were found to be used as household remedy. It was observed that the majority of these plants belonged to Rosaceae (10 taxa), Lamiaceae (8 taxa), Asteraceae (7 taxa) and Poaceae (4 taxa) families. Gastrointestinal system (46 remedies; 24,6%), respiratory system and chest diseases (41 remedies; 21,9%), urinary system (18 remedies; 9,6%), hemapoietic, immune system and cancer (18 remedies; 9,6%) remain most among 187 uses were documented as household remedy. © 2017, Marmara University. All rights reserved Daha fazlası Daha az

LiDAR data filtering and DTM generation using empirical mode decomposition

Ozcan, A.H. | Ünsalan, Cem

Article | 2017 | IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing10 ( 1 ) , pp.360 - 371

LiDAR technology is advancing. As a result, researchers can benefit from high-resolution height data from Earth's surface. Digital terrain model (DTM) generation and point classification (filtering) are two important problems for LiDAR data. These are connected problems since solving one helps solving the other. Manual classification of LiDAR point data could be time consuming and prone to errors. Hence, it would not be feasible. Therefore, researchers proposed several methods to solve DTM generation and point classification problems. Although these methods work fairly well in most cases, they may not be effective for all scenarios. . . . To contribute in this research topic, a novel method based on two-dimensional (2-D) empirical mode decomposition (EMD) is proposed in this study. Local, nonlinear, and nonstationary characteristics of EMD allow better DTM generation. The proposed method is tested on two publicly available LiDAR dataset, and promising results are obtained. Besides, the proposed method is compared with other methods in the literature. Comparison results indicate that the proposed method has certain advantages in terms of performance. © 2008-2012 IEEE Daha fazlası Daha az


Glerce, M | Unal, G

Article | 2017 | ANNALS OF FINANCIAL ECONOMICS12 ( 3 ) , pp.360 - 371

The aim of this paper is to show that the estimates made with vector autoregressive-moving- average (ARMA) models based on the coherent time intervals of the multiple time series give more precise results than the univariate case. The previous literature on dynamic correlations (co-movement) in between food and energy prices has mixed results and mainly based on parametric approaches. Therefore, partial wavelet coherence (PWC) and multiple wavelet coherence (MWC) methods are used, respectively, to uncover the coherency simultaneously for time and frequency domains. In our study; world oil, corn, soybeans, wheat and sugar prices are . . .examined instead of the return and volatility relationship between oil and agricultural commodities due to model-free approach of wavelet analysis Daha fazlası Daha az

Secondary metabolites from the leaves of Digitalis viridiflora

Kirmizibekmez, H. | Kúsz, N. | Karaca, N. | Demirci, F. | Hohmann, J.

Article | 2017 | Natural Product Communications12 ( 1 ) , pp.59 - 61

A new phenylethanoid glycoside, named digiviridifloroside (1), was isolated from the leaves of Digitalis viridiflora Lindley along with a known phenylethanoid glycoside, calceolarioside A (2), two flavonoid glycosides, scutellarein 7-O-ß-D-glucopyranoside (3) and hispidulin 7-O-ß-D-glucopyranoside (4), two cleroindicins, cleroindicins B (5) and F (6), a nucleoside, adenosine (7), as well as a mixture of ß-glucopyranosyl-(1›6)-4-O-caffeoyl-/ß-glucopyranose and 3,4-dihydroxyphenylethanol. The structure of the new compound was established as 3,4-dihydroxy-ß-phenylethoxy-6-O-(E)-feruloyl-ß-glucopyranosyl-(1›6)-4-O-(E)-caffeoyl-ß-glucopy . . .ranoside (1) based on extensive 1D-and 2D-NMR spectroscopy, as well as HR-ESI-MS. Digiviridifloroside represents a rare type of phenylethanoid glycoside which bears two aromatic acyl units in its structure. In addition to phytochemical studies, the isolates were evaluated for their in vitro antimicrobial activities against three pathogenic bacteria and three yeast strains using a microdilution method. Among the tested compounds, 5 exhibited moderate antibacterial activity against Bacillus cereus NRRLB 3711 with a MIC value of 25 µg/mL, whereas compounds 5 and 6 showed relatively high anticandidal activity against Candida strains with MIC values down to 12.5 µg/mL, in comparison to the standard antimicrobial compounds Daha fazlası Daha az

Hardware division by small integer constants

Ugurdag, H.F. | De Dinechin, F. | Gener, Y.S. | Goren, S. | Didier, L.-S.

Article | 2017 | IEEE Transactions on Computers66 ( 12 ) , pp.2097 - 2110

This article studies the design of custom circuits for division by a small positive constant. Such circuits can be useful for specific FPGA and ASIC applications. The first problem studied is the Euclidean division of an unsigned integer by a constant, computing a quotient and remainder. Several new solutions are proposed and compared against the state-of-the-art. As the proposed solutions use small look-up tables, they match well with the hardware resources of an FPGA. The article then studies whether the division by the product of two constants is better implemented as two successive dividers or as one atomic divider. It also cons . . .iders the case when only a quotient or only a remainder is needed. Finally, it addresses the correct rounding of the division of a floating-point number by a small integer constant. All these solutions, and the previous state-of-the-art, are compared in terms of timing, area, and area-timing product. In general, the relevance domains of the various techniques are different on FPGA and on ASIC. © 1968-2012 IEEE Daha fazlası Daha az

The influence of a bifidobacterium animalis probiotic on gingival health: A randomized controlled clinical trial

Kuru, B.E. | Laleman, I. | Yalnizoglu, T. | Kuru, L. | Teughels, W.

Article | 2017 | Journal of Periodontology88 ( 11 ) , pp.1115 - 1123

Background: There is growing interest in the use of probiotics in periodontal therapy; however, until now, most research has focused on lactobacilli probiotics. The aim of this study is to evaluate the effect of 4-week use of yogurt supplemented with Bifidobacterium animalis subsp. lactis DN-173010 versus a placebo yogurt, followed by a 5-day non-brushing period. Methods: Individuals were included in this single-mask, randomized, controlled study if probing depth (PD) was ?3 mm and attachment loss was ?2 mm. After professional prophylaxis, they were randomized into two groups receiving yogurt containing either placebo or B. animalis . . . for 28 days, followed by a 5-day non-brushing period. Outcome measures were plaque index (PI), gingival index (GI), bleeding on probing (BOP), PD, gingival crevicular fluid (GCF) volume, and total amount and concentration of interleukin (IL)-1b in GCF. These were measured at baseline, after 28 days of study product use, and subsequently after 5 days of plaque accumulation. Results: Fifty-one patients were analyzed. No intergroup differences could be detected before and after intake of study products. However, after plaque accumulation, significantly better results for all parameters were seen in the probiotic group compared with the control group (P Daha fazlası Daha az

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