Yayınlar
Koleksiyondaki öğeler
- MakaleYalnız künye2013Scopus SJRQ3Changes in chemical composition and peroxidase activity of turnip (Brassica rapa) during processing and frozen storage
Okcu, Zühal; Keleş, Fevzi; Şat, Ihsan Güngör
Chemical composition content and peroxidase enzyme activity of raw, canned and frozen turnip roots were determined. The peroxidase activity determined in the roots of raw turnip was 134x105 EU/100 g fresh weight and 170x105 EU/g protein. There were significant changes in the activities of peroxidase of canned and frozen turnip roots, as well as in the contents of protein. The peroxidase activity of canned turnip roots was practically undetectable while there was residual activity after blanching and freezing. Peroxidase is one of the most heat-stable enzymes in plants. This study shows that heat treatment of 3 min at 95°C is preferred for POD activity inactivating compared with other heat treatment. In addition, conserving process inactivated of POD activity, too.
AtıfScopus3WoS2
İncele - MakaleYalnız künye2011Scopus SJRQ3Preventive and protective effects of turkish propolis on H 2O 2-induced DNA damage in foreskin fibroblast cell lines
Aliyazicioglu, Yuksel; Demir, S.; Turan, I.; Cakiroglu, Tugba; Akalin, I.; Deger, O.; Bedir, A.
The aim of the present study was to evaluate the potential of Turkish propolis extracts if they prevent or protect foreskin fibroblast cells against hydrogen peroxide (H 2O 2)-induced oxidative DNA damage. Hydrogen peroxide (40 μM) was used as an inducer of oxidative DNA damage. The damage of DNA was evaluated by using the alkaline single cell gel electrophoresis (comet) assay. Turkish propolis extracts at concentrations of 25, 50, 75 and 100 μg/ml were prepared by ethanol. Anti-genotoxicity was assessed before, simultaneously, and after treatment of propolis extract (50 μg/ml) with H 2O 2. The results showed a significant decrease in H 2O 2-induced DNA damage in cultures treated with propolis extract. The antioxidant activity of phenolic components found in propolis may contribute to reduce the DNA damage induced by H 2O 2. Our findings confirmed the chemopreventive activity of propolis and showed that this effect may occur under different mechanisms.
AtıfScopus32WoS36OpenAlex43
İncele - MakaleAçık Erişim2012Scopus SJRQ2Metabolic syndrome in collection and disposal of solid waste sector
Eker, Hasan Huseyin; Bayraktarli, Recep Yilmaz; Issever, Halim; Ulas, Tumer; Erelel, Mustafa; Eser, Ali; Ozdilli, Kuraat; Ozder, Aclan
Objectives: This study aims to assess the frequency and factors relevant to metabolic syndrome in workers employed in the collection and disposal of solid waste sector. Materials and Methods: This cross-sectional study was conducted in the major solid waste collecting and disposal company named ISTAC AS (Istanbul Environmental Protection and Waste Processing Corporation) in Istanbul, Turkey. All 715 male employees of the company were included in the study without sampling. The study was completed with 619 subjects. Since it was a small group, female workers were not taken into ac-count in the study. Metabolic syndrome frequency was investigated according to the NCEP-ATP III criteria including the levels of systolic and diastolic blood pressure, waist perimeter, HDL, triglyceride, fasting blood glucose values. Results: Metabolic syndrome was present in 40.9% of participating employees. Metabolic syndrome was more common in those working in the excavation field (54.0%), such as caterpillar operators (56.5%), and less common in employees working in administrative offices, such as office staff or managers, who were under 35 years old and who had been working for less than 10 years (p < 0.05). Employees working in work stations other than administrative offices had a 2.60 times higher risk compared to those working in administrative offices. Conclusions: Metabolic syndrome may be related to work sta-tion, job, age and period worked by the subjects.
AtıfScopus6WoS5OpenAlex27İncele - MakaleAçık Erişim2012Scopus SJRQ3On the numerical solution of fractional parabolic partial differential equations with the dirichlet condition
Ashyralyev, Allaberen; Cakir, Zafer
The first and second order of accuracy stable difference schemes for the numerical solution of the mixed problem for the fractional parabolic equation are presented. Stability and almost coercive stability estimates for the solution of these difference schemes are obtained. A procedure of modified Gauss elimination method is used for solving these difference schemes in the case of one-dimensional fractional parabolic partial differential equations.
AtıfScopus17WoS13OpenAlex23İncele - MakaleYalnız künye2013Scopus SJRQ2Experimental analysis on FEM definition of backfill-rectangular tank-fluid system
Cakir, Tufan; Livaoglu, Ramazan
In the present study, the numerical and experimental investigations were performed on the backfill- exterior wall-fluid interaction systems in case of empty and full tanks. For this, firstly, the non-linear three dimensional (3D) finite element models were developed considering both backfill-wall and fluid-wall interactions, and modal analyses for these systems were carried out in order to acquire modal frequencies and mode shapes by means of ANSYS finite element structural analysis program. Secondly, a series of field tests were fulfilled to define their modal characteristics and to compare the results from proposed approximation in the selected structures. Finally, comparing the theoretical predictions from the finite element models to results from experimental measurements, a close agreement was found between theory and experiment. Thus, it can be easily stated that experimental verifications provide strong support for the finite element models and the proposed procedures themselves are the meritorious approximations to the real problem, and this makes the models appealing for use in further investigations.
AtıfScopus8WoS9OpenAlex7İncele - MakaleYalnız künye2013Scopus SJRQ1Evaluation of wind energy potentiality at coastal locations along the north eastern coasts of Turkey
Akpinar, Adem
This study aims to determine and evaluate wind energy potentiality along coastal locations at the North Eastern of Turkey. For this purpose, the present study has statistically analysed wind power potentials and wind characteristics from six meteorological stations (Sinop, Samsun, Ordu, Giresun, Trabzon, and Hopa) along the North Eastern (NE) geo-political coastal region of Turkey using the hourly or 3-hourly wind speed data measured at 10 m height during 9 years. The diurnal, monthly, and seasonal mean wind speed and wind power density at all the stations are assessed to have remarkable variations. The annual and seasonal frequency distributions and dominant wind directions of the all locations are determined. It is observed that the monthly mean wind speed in this region ranges from 1.53 m/s to 4.06 m/s. The maximum annual mean wind power density was found to be 59.96 W/m2 at Sinop while the maximum annual mean wind energy density was obtained to be 525.25 kWh/m2/year at the same station. It is further shown that Sinop, Hopa, and Trabzon have the higher wind power potential than other locations and their potential are close to each other.
AtıfScopus35WoS36OpenAlex53İncele - MakaleYalnız künye2011Scopus SJRQ4The effect of antifreeze admixtures on compressive strength of concretes subjected to frost action
Arslan, Metin; Çullu, Mustafa; Durmuş, Gökhan
This study aims to determine the effect of antifreeze admixture used in the concretes subjected to frost action on the concrete compressive strength. Three groups of concrete samples of C30 class were prepared with antifreeze admixtures by using the mixture of 30% calcium nitrate and 5% hydroxy ethoxy amin (A), calcium nitrate (B), Polyhydroxy amine (C). Concrete samples are put in the freezer in a fresh state 15 min after the mixing. Samples are subjected to frost action in 0, -5, -10, -15 and -20°C degrees for 48 hours. On the concrete samples water cured after 48 hours, compressive strength tests of 28 day are conducted. Consequently, it is seen that with the increase of the set temperature that concrete is cured, compressive strength of concrete is decreased and among all types of antifreezes the maximum decrease is seen between 0 and -5°C while the decrease in compressive strength is relatively less for -10, -15 and -20°C.
AtıfScopus6WoS7İncele - MakaleAçık Erişim2015Scopus SJRQ2Cytotoxic effect of Turkish propolis on liver, colon, breast, cervix and prostate cancer cell lines
Turan, Ibrahim; Demir, Selim; Misir, Sema; Kilinc, Kagan; Mentese, Ahmet; Aliyazicioglu, Yuksel; Deger, Orhan
Purpose: To investigate the total polyphenolic and flavonoid contents, antioxidant power and cytotoxic activity of ethanol extracts of Turkish propolis (EEP). Methods: The total polyphenolic and flavonoid contents of EEP were determined by spectrometric methods. Antioxidant power and cytotoxic activity of EEP were evaluated using ferric reducing antioxidant power (FRAP) and MTT assays, respectively. Results: The total polyphenolic and flavonoid contents, and FRAP value of EEP were 124.6 ± 1.5 mg gallic acid/g sample dry weight, 42.0 ± 0.8 mg quercetin/g sample dry weight and 311.0 ± 2.5 mg trolox/g sample dry weight, respectively. EEP exhibited powerful cytotoxic effects against the five human cancer cell lines. The highest cytotoxic activity of Turkish EEP was demonstrated on PC-3 cell line (IC50 = 20.7±3.4 μg/mL). Conclusion: The results demonstrate that EEP is a good source of antioxidant and a natural antitumor agent capable of reducing cancer cell proliferation.
AtıfScopus64WoS60OpenAlex71İncele - MakaleAçık Erişim2011Scopus SJRQ3Heat and drought resistance criteria in spring bread wheat (Triticum aestivum L.): Morpho-physiological parameters for heat tolerance
Bahar, Bilge; Yildirim, Mehmet; Yucel, Cemal
This study was aimed at evaluating some morpho-physiological parameters such as stomatal conductance (gs), canopy temperature (CT), canopy temperature depression (CTD) and stay green duration (SGD) in terms of heat tolerance. For this purpose, trials designed according to randomized complete blocks were conducted with twenty-four spring bread wheat genotypes as three replicated in the Research and Application Area of Field Crops Department of Agricultural Faculty of Cukurova University in 2002 to 2003 and 2003 to 2004 growth seasons. The measurements of gs were made at two different dates at heading stage in 2003 to 2004 growth season. CT was measured at two growth stages (late milky and soft dough) in 2002 to 2003 (first) season and it was also measured at two different hours at the complete heading stage in 2003 to 2004 (second) season. CTD was measured at two different hours at the complete heading stage in the second season. The other morpho- physiological parameter was SGD, which was determined in the first growth season. As a result: (1) The high gs values were observed at both measuring dates even though there was no significant differences among the genotypes; (2) CT showed significant differences except T2 measurement in 2003 to 2004 season, yet significant negative correlations were found between CT and grain yield (GY) in 2003 to 2004 season and in general mean; (3) Despite not being significant differences among the genotypes, a strong positive correlation was found between CTD and GY; (4) In spite of the fact that genotypes did not show any statistical differences, it was found that SGD had a negative significant correlation with CT but positive non-significant correlation with GY. It is concluded from assessments of all physiological traits that such genotypes as Kauz/Altar 84//Ads, Varona Cno 79, Mon's'/Ald's'//Bow's' and WL6718 can be high yielding even if under heat stressed conditions, and can be used as gene pool in wheat breeding programs for tolerance to heat stress.
AtıfScopus17OpenAlex25İncele - MakaleYalnız künye2011Scopus SJRQ2Application of cattle manure, zeolite and leonardite improves hay yield and quality of annual ryegrass (Lolium multiflorum Lam.) under semiarid conditions
Yolcu, Halil; Seker, Hayati; Gullap, M. Kerim; Lithourgidis, Anastasios; Gunes, Adem
A field experiment was conducted under semiarid conditions to investigate the effect of cattle manure (20 and 40 t ha -1), zeolite (250, 500 and 750 kg ha -1), and leonardite (250, 500 and 750 kg ha -1) applications on hay yield and nutrient quality of annual ryegrass. Application of manure, leonardite, and zeolite increased ryegrass hay yield by 4, 24 and 47%, respectively compared with the control. In all fertilizer levels, the crude protein (CP) content was greater than the control and increased as the level of each fertilizer was increased. Most fertilizer treatments (except from the first level of cattle manure) gave higher CP yield than the control. All fertilizers increased the content of K, S, Ca, Mg, Fe, Mn and B of ryegrass hay as compared with the control, whereas they had no significant effect on Cu and Zn content. The content of most minerals increased as the amount of manure and leonardite applications increased. In conclusion, all fertilizers (especially zeolite) showed great potential for use in organic agriculture as they can improve plant growth and soil conditions in the long term.
AtıfScopus28WoS26İncele - MakaleYalnız künye2012Scopus SJRQ3Burnout and job satisfaction in surgical nurses and other ward nurses in a tertiary hospital: A comparative study in Turkey
Cilingir, Dilek; Gursoy, Ayla Akkas; Colak, Ayse
Aim: Job dissatisfaction and burnout have a negative effect on health care providers, especially nurses. This often results in a shortage of qualified personnel as well as a decrease in the quality and level of care provided to patients. This study carried out to describe the level of burnout and job satisfaction among surgical nurses and to compare them to nurses working in other wards in terms of these aspects. Methods: The study was designed as a cross-sectional and descriptive survey. The sample of the research consisted of 330 nurses working in a tertiary hospital in the northeastern part of Turkey. A questionnaire form, Minnesota Job Satisfaction Questionnaire and Maslach Burnout Inventory were used in order to collect the data. The student t test in independent variables, ANOVA, and Pearson's Correlation Coefficient were used in order to analyze the data. Results: Study results indicated that surgical nurses experienced emotional exhaustion more than pediatric nurses. They had higher levels of depersonalization than the policlinic and gynecological nurses. It was also found that nurses working in operating rooms and urology units experienced more emotional exhaustion than other surgical nurses. Conclusion: The study results showed that the state of emotional exhaustion and depersonalization of the surgical nurses was higher than the means of nurses working in other wards and job satisfaction and personal accomplisment were similar.
AtıfScopus6WoS6İncele - MakaleYalnız künye2015Scopus SJRQ1Preliminary assessment of a yoghurt-like product manufactured from hazelnut slurry: Study using response surface methodology
Ilyasoğlu, Huri; Yilmaz, Firat; Burnaz, Nesibe Arslan; Baltaci, Cemalettin
The aim of this study was to evaluate the possibility of using hazelnut slurry in manufacture of yoghurt. A yoghurt-like product was prepared from hazelnut slurry fortified with skimmed milk powder. The effects of the total solids content of the hazelnut slurry (TSCHS, 8-16g100g-1) and the content of milk powder (CMP, 6-9g100g-1) on the proximate composition, physicochemical and sensorial properties, fatty acid composition, total phenolic content (TPC) and antioxidant activity of the product were evaluated using response surface methodology. Both the TSCHS and the CMP had a significant effect on the total solids content, b value, syneresis, palmitic and oleic acid content, and FRAP value. Only the TSCHS showed a significant effect on the protein and fat content, a value, water-holding capacity, TPC and ABTS values. Only the CMP showed a significant effect on the carbohydrate and ash content and the acidity. The characteristics of the product generally appeared to be compatible with those of yoghurt. The product was rich in unsaturated fatty acids. Therefore, using hazelnut slurry in manufacture of yoghurt may be proposed to enhance the health benefits of yoghurt.
AtıfScopus24WoS22OpenAlex26İncele - MakaleYalnız künye2012Scopus SJRQ2Complete versus partial mobilization of splenic flexure during laparoscopic low anterior resection for rectal tumors: A comparative study
Gezen, Cem; Altuntas, Yunus E.; Kement, Metin; Vural, Selahattin; Civil, Osman; Okkabaz, Nuri; Aksakal, Nihat; Oncel, Mustafa
Background: The aim of the current study is to compare the results after partial and complete splenic flexure mobilization (SFM). Subjects and Methods: The records of laparoscopic and hand-assisted laparoscopic procedures for primary rectal tumor patients were abstracted from a prospectively designed database. The phrenicocolic and splenocolic ligaments were divided via a four-trocar technique in the partial SFM group, and dissection was continued with the separation of gastrocolic and pancreaticomesocolic attachments via a five-trocar procedure in the complete SFM group. The following data were compared between the groups: Demographics, intra- and postoperative information, and pathological features. Results: In total, 122 cases (77 [63.1%] male, 58.2±13.2 years old) who underwent a partial (n=36, 29.5%) or a complete (n=86, 70.5%) SFM were included. Reservoir creation (48.8% versus 19.4%, P=.003) was more common and conversion (8.1% versus 22.2%, P=.039) was less frequent in the complete SFM group, but there were significantly more T4 tumors in the partial group (16.7% versus 2.3%, P=.008). Demographics, other intra- and postoperative parameters, and pathological features were identical. Conclusions: In our study, complete SFM decreased conversion rates, but this finding may be related to the higher rate of T4 tumors in the partial SFM group. Complete SFM assures an increase in reservoir creation in patients receiving a low anterior resection. Because other parameters are identical, the decision for the level of SFM is better left to the surgeon in cases undergoing a low anterior resection, but complete SFM may be preferred in cases who are candidates for a reservoir formation.
AtıfScopus22WoS17OpenAlex28İncele - MakaleYalnız künye2011Scopus SJRQ2The Sumela Monastery slope in Maçka, Trabzon, Northeast Turkey: Rock mass properties and stability assessment
Gelişli, Kenan; Şeren, Aysel; Babacan, Ali Erden; Çataklı, Aycan; Ersoy, Hakan; Kandemir, Raif
In 2001, rock falls occurred on the southern slope of the Sumela Monastery, which was built on a cliff in Trabzon, north east Turkey, and is visited by many tourists. Considering the steepness of the slope and difficulty of access, rock classifications were made based on seismic wave velocity, rock mass quality (Q), rock quality designation (RQD) and rock mass rating (RMR). The results indicated extremely poor to very poor rock in the cracked, fractured and weathered parts and poor to fair rock in the intact parts of the monastery slope. As a consequence, rock fall, slide and rolling may occur from time to time. These constitute a hazard to the facilities of the monastery and access paths. It is recommended that cracked areas are strengthened with cement-based materials, that accumulated rocks are removed, and that retaining walls are constructed on solid rock around the unstable rock blocks.
AtıfScopus13WoS8OpenAlex12İncele - MakaleAçık Erişim2011Scopus SJRQ2Solution of nonlinear oscillators with fractional nonlinearities by using the modified differential transformation method
Merdan, Mehmet; Gökdoǧan, Ahmet
In this paper, an aproximate analytical method called the differential transform method (DTM) is used as a tool to give approximate solutions of nonlinear oscillators with fractional nonlinearites. The differential transformation method is described in a nuthsell. DTM can simply be applied to linear or nonlinear problems and reduces the required computational effort. The proposed scheme is based on the differential transform method (DTM), Laplace transform and Padé approximants. The results to get the differential transformation method (DTM) are applied Padé approximants. The reliability of this method is investigated by comparison with the classical fourth-order Runge-Kutta (RK4) method and Cos-AT and Sine-AT method. Our the presented method showed results to analytical solutions of nonlinear ordinary differential equation. Some plots are gived to shows solutions of nonlinear oscillators with fractional nonlinearites for illustrating the accurately and simplicity of the methods.
AtıfScopus16OpenAlex21
İncele - MakaleAçık Erişim2014Scopus SJRQ1Simplex lattice mixture design approach on physicochemical and sensory properties of wheat chips enriched with different legume flours: An optimization study based on sensory properties
Kayacier, Ahmed; Yüksel, Ferhat; Karaman, Safa
In this study, physicochemical and sensory characteristics of wheat chips enriched with different legume flours were investigated. Wheat chips formulations were composed with the mixture of wheat flour and the mixture of three different legume flours (wheat-legume ratio 80:20). Mixture design approach was used to determine the effect of interactions between pea, chickpea and soy flour on the physicochemical and sensory properties of chips produced with wheat-legume flour mixture. In addition, product optimization was carried out by using ridge analysis to determine the optimum legume flour mixture proportions based on sensory properties of chips samples. Chickpea flour was found to be highest desired component depending on the general acceptability scores of chips. Protein content of chips increased significantly with the addition of soy flour. Optimum limit values of chickpea, pea and soy flour in the legume flour mixture used for the enrichment of the wheat chips were found to be 50-100 g/100 g, 0-60 g/100 g and 0-45 g/100 g legume flour, respectively, with respect to sensory properties. Additionally, ridge analysis results showed that the wheat chips should include only chickpea flour in the legume flour fraction to obtain maximum overall preference score (6.08).
AtıfScopus29WoS31OpenAlex30İncele - MakaleAçık Erişim2012Scopus SJRQ2Finite difference method for the reverse parabolic problem
Ashyralyyev, Charyyar; Dural, Ayfer; Sozen, Yasar
A finite difference method for the approximate solution of the reverse multidimensional parabolic differential equation with a multipoint boundary condition and Dirichlet condition is applied. Stability, almost coercive stability, and coercive stability estimates for the solution of the first and second orders of accuracy difference schemes are obtained. The theoretical statements are supported by the numerical example.
AtıfScopus20WoS20OpenAlex17İncele - MakaleYalnız künye2012Scopus SJRQ2In vitro antifungal evaluation of various plant extracts against walnut anthracnose (Gnomonia leptostyla (Fr.) Ces et de Not.)
Kalkişim, Özgün
Antifungal activity of different parts (fruit and leaf) of Cornus mas L. (Cornecea), Morus nigra L. (Moraceae) and Prunus laurocerasus L. (Rosaceae) methanol extracts has been tested against walnut anthracnose. Agar dilution method has been used in antifungal activity studies. A standard fungicide (80% Maneb; Hektas Group) was used in order to compare the herbal extracts. The highest antifungal effect was observed in the leaf extracts of C. mas and M. nigra for which mycelium growth inhibition ratios observed were 67.95% and 60.04%, respectively. Different antifungal effect ratios have been determined for other plant extracts used. Also, the effect of Gnomonia leptostyla disease on walnut yield was examined for three different types of walnut trees. According to these results, it has been concluded that walnut anthracnose disease has an effect on the yield.
AtıfScopus10WoS7İncele - MakaleYalnız künye2012Scopus SJRQ2Laparoscopic and conventional resections for low rectal cancers: A retrospective analysis on perioperative outcomes, sphincter preservation, and oncological results
Gezen, Cem; Altuntas, Yunus E.; Kement, Metin; Aksakal, Nihat; Okkabaz, Nuri; Vural, Selahattin; Oncel, Mustafa
Background: This study aims to compare the results of laparoscopic and conventional techniques in patients with low rectal cancers. Subjects and Methods: A retrospective data analysis was initiated in patients underwent laparoscopic or conventional surgery for cancers located in the low (<6 cm) rectum. Patient and tumor-related information, outcomes of operations, and survival were compared between the groups. Results: Among 142 patietns (91 men [64.1%]; mean±standard deviation age, 57.7±14.6 years) who had tumors located <6 cm from the dentate line, 92 (64.8%) were operated on with the laparoscopic technique. Demographics, tumor stage, and localization (2.9±2.0 versus 2.9±2.1 cm from the dentate line in laparoscopic and conventional arms, respectively; P=.968) were similar. However, there were more patients in the laparoscopic group who received neoadjuvant chemoradiation therapy (92.4% versus 80.0%; P=.03), since there were significantly fewer cases with stage I tumors in this group (3.3% versus 14%; P=.33). The conversion rate was 14.1% (n=13). The amount of bleeding and the requirement for transfusion decreased (P<.05 for both), and the possibility of sphincter-saving procedures (66.3% versus 34.0%; P<.001) increased, in the laparoscopy group. Other parameters were identical. In the laparoscopy group, the number of harvested lymph nodes (10.2±5.4 versus 12.4±6.0; P=.025) and the rate of vascular invasion (27.5% versus 47.8%; P=.021) were less, and Kaplan-Meier analysis revealed an improved survival (P=.042), although the follow-up period was significantly shorter in this group (P<.001). Conclusions: Laparoscopic surgery for low rectal cancers may be technically feasible and oncologically safe. Laparoscopy may increase the possibility of sphincter preservation.
AtıfScopus10WoS6OpenAlex8İncele - MakaleAçık Erişim2015Scopus SJRQ2Genetic diversity and population structure of common bean (Phaseolus vulgaris L.) accessions through retrotransposon-based interprimer binding sites (iPBSs) markers
Nemli, Seda; Kianoosh, Tala; Tanyolaç, Muhammed Bahattin
The common bean (Phaseolus vulgaris L.) is an important crop throughout the world and is highly recommended for many developing countries due to its nutritional components. A retrotransposon-based DNA marker system, interprimer binding sites (iPBSs), developed from reverse transcriptase primer binding sites, was used to determine genetic diversity in common bean accessions. The genetic polymorphism and effectiveness of the marker system were evaluated. A total of 180 polymorphic bands were detected using 47 iPBS primers among 67 common bean accessions, with an average of 4 polymorphic fragments per primer. The genetic similarity between accessions was calculated using the software NTSYS-pc and ranged from 0.09 to 0.99. The average polymorphism information content value for the iPBS markers was 0.73. A model-based clustering method classified the common bean accessions into 4 populations using STRUCTURE software. The results indicated that the iPBS marker method can successfully determine the genetic diversity level in common bean accessions.
AtıfScopus63WoS60OpenAlex56TR Dizin12İncele
