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- MakaleYalnız künye2024Scopus SJRQ2Effect of Atherogenic Index of Plasma on Pre-Percutaneous Coronary Intervention Thrombolysis in Myocardial Infarction Flow in Patients With ST Elevation Myocardial Infarction
Aydinyilmaz, Faruk; Özbeyaz, Nail Burak; Guliyev, Ilkin; Algül, Engin; Sahan, Haluk Furkan; Kalkan, Kamuran
Dyslipidemia is an important risk factor for cardiovascular morbidity and mortality. Although low-density lipoprotein (LDL) is primarily responsible, the importance of triglyceride (TG) and high-density lipoprotein (HDL) has also been recognized. The present study investigated the effect of the atherogenic index of plasma (AIP), in which atherogenic and protective lipoproteins were evaluated together, on the initial flow in patients with ST elevation myocardial infarction. AIP was calculated as log(TG/HDL-cholesterol). Patients included in the study (n = 1535) were divided into Thrombolysis in Myocardial Infarction (TIMI) flow grade 0 and >0. AIP was found to be significantly different between 2 groups (.55 & PLUSMN; .23 vs .67 & PLUSMN; .21; P < .001). AIP was an independent predictor for pre-intervention TIMI flow (Odds Ratio: 2.778). A moderate correlation was found between TIMI frame count measurements, calculated in patients with TIMI 2-3, and AIP (Pearson correlation coefficient: .63, P < .001). In the receiver operating characteristic analysis, AIP showed the highest area under curve (AUC) compared with other lipid parameters for predicting vascular patency. The AUC of AIP was .634, the cut-off value was .59, and the sensitivity and specificity were 67.6% and 68.4%, respectively (P < .001). In conclusion, AIP was found to be an important marker affecting pre-percutaneous coronary intervention TIMI flow.
AtıfWoS10OpenAlex13
İncele - MakaleYalnız künye2026Scopus SJRQ3The Predictive Role of Fetal Growth for Placental Invasion Anomalies in Placenta Previa
Koca, Evrim; Dincgez, Burcu; Ozgen, Gulten; Simsek, Deniz
Objective To evaluate the predictive role of fetal percentile for placental invasion anomalies in placenta previa cases. Study Design: Retrospective studyPlace & Duration of the Study: Training and Research Hospital, January 2018 and December 2023 Methodology A total of 298 placenta previa cases was divided into two groups: PAS (placenta accreta spectrum)-positive placenta previa (n=98) and PAS-negative placenta previa (n=200). Then PAS-positive placenta previa cases were divided into two subgroups: placenta increta-accreta (n=59) and placenta percreta (n=39). Sociodemographic findings, obstetric features, fetal percentile measurements between 22 and 28 gestational weeks and perioperative characteristics of patients were recorded and compared between groups. Results Fetal percentile was significantly lower in PAS-positive placenta previa cases as compared to PAS-negative placenta previa cases (p<0.001). Moreover, fetal percentile <= 52.5 discriminated PAS-positive placenta previa cases from PAS-negative placenta previa cases with 75.51% sensitivity and 51.5% specificity (p<0.001, AUC=0.654). In multivariate analysis, a fetal percentile of 52.5 and below increased the risk of PAS by approximately 4 times (Hosmer-Lemeshow p=0.101, model p<0.001). No significant difference was detected between placenta percreta and placenta accreta-increta groups in terms of fetal percentile (p=0.224). Conclusion Fetal percentiles calculated between 22 and 28 gestational weeks could discriminate PAS-positive placenta previa cases from PAS-negative placenta previa cases, although it had no role in discriminating placenta percreta from accreta and increta cases. Therefore, the evaluation of fetal percentile in placenta previa cases can be considered as a supportive finding in the prediction of invasion anomaly although it does not determine the depth of invasion.
- MakaleYalnız künye2026Scopus SJRQ2Selective extraction of rare earth elements from end-of-life NdFeB magnets via low-temperature NH4Cl-based chlorination roasting and water leaching
Kumas, Cavit; Prasetia, Hendra; Sumardi, Slamet; Astuti, Widi; Mufakhir, Fika Rofiek; Daulay, Amru; Wicaksono, Mahruri Arif
Neodymium-iron-boron (NdFeB) magnets are critical components in the transition to a low-carbon energy economy due to their superior magnetic properties. They have significantly higher rare earth element (REE) content (25-35%) compared to natural resources (0.15-2%), making end-of-life NdFeB magnets a valuable secondary REE source. In this study, the selective recovery of REEs from end-of-life NdFeB magnets was investigated using water leaching following chlorination roasting with NH4Cl. A series of experiments was conducted to evaluate the effect of NH4Cl on the NdFeB magnet ratio, roasting temperatures, and roasting duration. Under optimal conditions (300 degrees C, 3 h, NH4Cl at twice the stoichiometric requirement), the roasted products were subjected to water leaching (500 rpm, 90 degrees C, liquid - solid ratio of 20 mL/g, 1 h). resulting in over 95% REE dissolution. Rare earth oxalates were precipitated from the pregnant leach solution with 90% efficiency using 1.5 times the stoichiometric requirement of oxalic acid. Subsequent calcination at 850 degrees C for 2 h yielded rare earth oxides with 99.8% REE purity. Moreover, the dissolution of iron was effectively suppressed through a simple two-stage Fe(OH)3 precipitation step, providing a more economical and selective recovery route. Les aimants de n & eacute;odyme-fer-bore (NdFeB) sont des composants critiques de la transition vers une & eacute;conomie & eacute;nerg & eacute;tique & agrave; faible carbone gr & acirc;ce & agrave; leurs propri & eacute;t & eacute;s magn & eacute;tiques sup & eacute;rieures. Ils ont une teneur en & eacute;l & eacute;ments de terres rares (ETR) sup & eacute;rieures (25-35%) aux ressources naturelles (0.15-2%), ce qui rend les aimants de NdFeB en fin de vie une source secondaire pr & eacute;cieuse d'ETR. Dans cette & eacute;tude, on a examin & eacute; la r & eacute;cup & eacute;ration s & eacute;lective des ETR des aimants de NdFeB en fin de vie par lixiviation aqueuse apr & egrave;s grillage chlorurant avec du NH4Cl. On a effectu & eacute; une s & eacute;rie d'exp & eacute;riences pour & eacute;valuer l'effet du rapport NH4Cl/aimant de NdFeB, des temp & eacute;ratures et de la dur & eacute;e de grillage. Dans des conditions optimales (300 degrees C, 3 h et une concentration de NH4Cl deux fois sup & eacute;rieure & agrave; la st oe chiom & eacute;trie requise), on a soumis les produits grill & eacute;s & agrave; une lixiviation aqueuse (500 tr/min, 90 degrees C, rapport liquide/solide de 20 mL/g, 1 h) conduisant & agrave; une dissolution de plus de 95% des ETR. On a pr & eacute;cipit & eacute; les oxalates de terres rares & agrave; partir de la solution de lixiviation enrichie avec une efficacit & eacute; de 90% en utilisant 1.5 fois la quantit & eacute; st oe chiom & eacute;trique requise d'acide oxalique. Une calcination ult & eacute;rieure & agrave; 850 degrees C pendant 2 h a produit des oxydes de terres rares d'une puret & eacute; de 99.8%. De plus, la dissolution du fer & eacute;tait efficacement supprim & eacute;e par une simple & eacute;tape de pr & eacute;cipitation de Fe(OH)3 en deux phases, offrant une voie de r & eacute;cup & eacute;ration plus & eacute;conomique et plus s & eacute;lective.
- Derleme MakaleAçık Erişim2026Scopus SJRQ1Microplastic Contamination in Amphibians and Reptiles: An Ecotoxicological Synthesis of Exposure, Mechanisms, and Risk Implications
Berber, Ahmet Ali; Akbulut, Cansu; Demir, Sefika Nur; Kurnaz, Muammer
Microplastic (MP) contamination has become a defining feature of twenty-first century environmental change, yet the toxicological and ecological consequences for amphibians and reptiles-two vertebrate classes already facing severe extinction pressures-remain fragmented across taxa, regions, and methodological traditions. Here, we synthesize field and experimental evidence from five continents to provide a taxonomically balanced, mechanistically grounded, and geographically explicit assessment of MP exposure, bioaccumulation, and toxicity in herpetofauna, drawing on a structured literature search in Web of Science, Scopus, and PubMed (January 2015-March 2026). Field detection rates of MPs in amphibian larvae range from 26% in conservatively screened Central European populations to 73-80% in anuran tadpoles from high-anthropogenic-pressure Anatolian catchments, with fibrous polyethylene terephthalate (PET), polyethylene (PE), and polypropylene (PP) particles dominating the detected burden. Mechanistic evidence converges on oxidative stress cascades, hypothalamic-pituitary-thyroid axis disruption, gut and cutaneous microbiome dysbiosis, and compromised antiviral and antifungal immunity, with the latter potentially amplifying vulnerability to Batrachochytrium dendrobatidis and to ranavirus. Among reptiles, sea turtles display near-universal MP ingestion with documented maternal transfer to eggs; freshwater turtles, terrestrial squamates, and crocodilians remain critically understudied. Three structural asymmetries constrain current ecotoxicological risk characterization: taxonomic bias toward anurans and sea turtles, geographic bias toward the Global North, and experimental bias toward acute, supra-environmental laboratory exposures using pristine, single-polymer particles that fail to capture the chemical complexity of weathered field mixtures. We argue that MP burden may warrant consideration as a candidate stressor criterion within IUCN Red List assessments and within environmental risk assessment frameworks for freshwater and terrestrial biodiversity once a robust quantitative relationship between MP burden and demographic decline or population-level fitness has been established, and propose six hypothesis-driven research priorities: methodological standardization, reptile toxicokinetics, transgenerational epigenetics, MP-pathogen microbiome interactions and their translation into population viability models, temperature & times; MP interaction under climate warming, and population-genetic consequences of contemporary MP-driven selection, as the most tractable avenues for ecotoxicological progress and for the development of herpetofauna-specific risk characterization frameworks.
AtıfWoS2OpenAlex2İncele - MakaleYalnız künye2024Scopus SJRQ2Psychosocial Dimension of Substance Use Disorder
Ediz, Cicek; Uzun, Sevda; Erdas, Mehmed Burak
This study used a phenomenological research approach to investigate the experiences of individuals in an eastern Turkey city who initiated substance use during childhood. Fourteen participants were selected using criterion sampling and engaged in semistructured, in-depth interviews. The interviews were recorded and transcribed, and a thematic analysis was applied to the data. The study revealed 3 overarching categories (reasons leading to substance use, effects of substance addiction, and coping with addiction) and 9 subthemes (familial factors, environmental factors, traumatic experiences, personal factors, psychological effects, physical effects, social effects, perception of social support, and treatment process). (c) 2023 Elsevier Inc. All rights reserved.
AtıfWoS2OpenAlex2İncele - MakaleAçık Erişim2026Scopus SJRQ4Pan-Immune-Inflammation Value as an Independent Indicator of Isolated Coronary Artery Ectasia
Tunca, Cagatay; Özkan, Mehmet Taha; Ergin, Berin Nur; Gök, Saner Bahadir; Tas, Alperen; Kürklü, Haci Ali; Akbuga, Kursat; Tanik, Veysel Ozan; Özlek, Bulent
Objective: Coronary artery ectasia (CAE) is increasingly recognized as an active inflammatory vascular disorder rather than a benign anatomical variant. The pan-immune-inflammation value (PIV) is a novel biomarker integrating neutrophil, monocyte, platelet, and lymphocyte counts, providing a comprehensive measure of systemic inflammation. This study aimed to evaluate the association between PIV and CAE and to compare their diagnostic performance with that of conventional inflammatory indices. Method: In this retrospective case-control study, 17,538 patients who underwent elective coronary angiography between 2018 and 2024 were screened. A total of 228 patients with isolated CAE and 296 age-, sex-, and Body Mass Index (BMI)-matched controls with normal coronary arteries were included. Hematologic and biochemical parameters were analyzed, and inflammatory indices were calculated. Logistic regression and receiver operating characteristic (ROC) analyses were performed to identify independent predictors and assess diagnostic performance. Results: Patients with CAE had significantly higher PIV levels compared to controls (801.6 [504.4-1301.8] vs. 491.8 [302.4-872.7], P < 0.001). In multivariable logistic regression, log-transformed PIV remained independently associated with CAE (odds ratio [OR]: 1.987, 95% confidence interval [CI]: 1.057-3.737, P = 0.033), along with hypertension, triglycerides, high-density lipoprotein (HDL) cholesterol, and serum creatinine. PIV demonstrated the highest discriminative ability among all inflammatory indices (area under the curve [AUC]: 0.674, 95% CI: 0.623-0.722), and correlated strongly with the Systemic Immune-Inflammation Index (SII), neutrophil-to-lymphocyte ratio (NLR), platelet-to-lymphocyte ratio (PLR), and Systemic Inflammation Response Index (SIRI) (P = 0.75-0.94). Conclusion: Elevated PIV levels are independently associated with CAE, reflecting the pivotal role of systemic inflammation in its pathogenesis. Given its simplicity and availability, PIV may serve as a practical adjunctive marker for identifying patients at risk of CAE, warranting validation in larger prospective studies.
AtıfWoS4OpenAlex2İncele - MakaleYalnız künye2026Comparative Tactical Paradigmsin Football: Insights FromScandinavian, Baltic, and TurkishCoaching Models
Eroglu, Seref; Toktas, Sermet; Çaglar, Esin Cagla; Ünlü, Cisem; ÇevIker, Abdulkerim; Zambak, Omer
The goal of this study was to compare the tactics expertise paradigms and game-reading skills of elite football coaches with different geographical and cultural back-grounds, based on empirical data. In total, ten elite football coaches participated in the study. All participants had at least 10 years of coaching experience and had either UEFA Pro or A license. Coaches came from the following football federations: Scandinavian (n = 4) , Baltic (n = 3) , and Turkish (n = 3) In order to gather empirical data regarding the knowledge of coaches about theory and methods in cri-sis situation (tacit knowledge), we used the interview form comprising of 25 ques-tions. The Kruskal-Wallis H test results indicated significant differences between groups (p < 0.05) in all aspects of tacti-cal expertise paradigm examined: strate-gic planning, offensive organization, de-fensive transitions, crisis management, and methodological fidelity. Effect sizes calcu-lated for each aspect proved that the mem-bership of the coaches' group (geographi-cal and cultural school) accounted for sig-nificant percentage of variance in their tac-tical expertise (n(2) = 0.777 - 0.86) The results obtained showed that Scandinavian School of coaching prioritized struc-tural discipline and collective intelligence principles, obtaining the highest ratings in strategic planning (4.43) and method-ological fidelity (4.77). Turkish School demonstrated its advantage in crisis man-agement (4.59); however, Turkish coaches were characterized by the lowest rate in methodological fidelity (2.94). As the re-sult, ability of Turkish coaches in tactical improvisation and intuitive expertise con-flicts with system-oriented approach. De-spite obtaining the best score in defen-sive transitions (4.76), the Baltic School demonstrated its reactivity in regards to offensive organization and strategic plan-ning. To conclude, this study showed that tactical expertise is not only a set of tech-nical knowledge, but also the specific cog-nitive scheme that includes geographic and cultural code elements. It can be concluded that distinctive feature of Scandinavian ra-tionalism and Turkish dynamism provides useful theoretical background for hybrid coach models in contemporary football.
- MakaleYalnız künye2012Scopus SJRQ2Effect of protrusion at the ends of bondline in single lap joints under tension and bending
Akpinar, Salih; Temiz, Semsettin; Aydin, Murat Demir; Özel, Adnan
In this work, elasto-plastic stress analysis of single lap joints with and without protrusion in adhesive bondline subjected to tension and bending was carried out using 2D non-linear finite element analysis and confirmed experimentally. AA 2024-T3 aluminum adherends were bonded with SBT 9244 film adhesive. The protrusion was obtained by extending the adhesive film by 2 mm from the overlap length at both overlap ends. Three different adherend thicknesses and overlap lengths for each loading and bondline type were used. The joints with and without protrusion, for comparison, were loaded with the same load for each adherend thickness and overlap length. Finally, it was observed that the protrusion reduces the strength in the joint under tension, while the protrusion increases the strength in the joint under bending.
AtıfWoS14OpenAlex15İncele - MakaleYalnız künye2011Scopus SJRQ2An Atropa belladonna L. poisoning with acute subdural hematoma
Cikla, Ulas; Turkmen, Suha; Karaca, Yunus; Ayaz, Ahmet Faik; Turedi, Suleyman; Gunduz, Abdulkadir
Atropa belladonna L. is a plant long known to cause poisoning. But no cases of acute subdural hematoma resulting from such poisoning have been reported so far. Care must also be taken in terms of acute pancreatitis and rhabdomyolysis in cases of such poisoning. The plant may sometimes be mistaken for the Caucasian blueberry, V. arctostaphylos L. At least one anti-cholinesterase toxidrome finding was determined in all the nine cases of belladonna poisoning in this series. No elevated creatine kinase was reported in one case with acute subdural hematoma and hyperamylasemia.
AtıfWoS17OpenAlex25İncele - MakaleAçık Erişim2025Scopus SJRQ1Analyzing the impact of economic growth and FDI on sustainable development goals in China: insights from ecological footprints and load capacity factors
Güler, Ilkay; Naimoglu, Mustafa; Simsek, Orhan; Adali, Zafer; Özbek, Sefa
This study investigates the impact of economic growth and foreign direct investment (FDI) on China's sustainable development goals (SDGs), specifically Zero Hunger (SDG 2), Life Below Water (SDG 14), and Life on Land (SDG 15). It examines ecological footprints and load capacity factors (LCFs) in cropland, fishing, forest, and grazing land using Fourier bootstrap autoregressive distributed lag (ARDL) cointegration analysis and fully modified ordinary least squares (FMOLS) estimators. The study covers the period from 1979 to 2022. Key findings reveal that while GDP and FDI often exacerbate environmental degradation, urbanization and value-added agriculture, forestry, and fishing (FAFGDP) improve sustainability in some areas. The study confirms the pollution haven hypothesis for most models, suggesting that China's legal and regulatory frameworks may inadequately mitigate FDI's adverse environmental effects. The Environmental Kuznets Curve (EKC) hypothesis is not supported as GDP growth generally increases ecological footprints. However, trade openness and urbanization show positive influences on environmental sustainability. Policy recommendations include enhancing energy efficiency, promoting renewable energy, implementing green technologies in agriculture and urban development, and revising FDI policies to incentivize environmentally friendly practices. These strategies are crucial for achieving China's sustainable development goals and mitigating the pressures of human activities on natural resources.
AtıfWoS23OpenAlex27İncele - Editöre MektupAçık Erişim2026Scopus SJRQ4Reply to the Letter to the Editor: Enhancing Risk Stratification in Coronary Artery Ectasia: The Synergy of Inflammation and Metabolic Scores
Tunca, Cagatay; Özkan, Mehmet Taha; Ergin, Berin Nur; Gök, Saner Bahadir; Tas, Alperen; Kürklü, Haci Ali; Akbuga, Kursat; Tanik, Veysel Ozan; Ars, Kardiyol Dern
- MakaleAçık Erişim2019In vitro Antifungal Activities of Fluconazole, Camellia sinensis and Cydonia oblonga Leaf Extracts Against Candida Species Isolated from Blood Cultures
Hanci, Hayrunisa; Coskun, Mehmet Veysel; Uyanik, Muhammed Hamidullah; Sezen, Selma; Igan, Hakan
Objective: In this study we investigated in vitro antifungal activity of fluconazole, green tea (Camellia sinensis) and quince leaf (Cydonia oblonga) extracts in Candida strains isolated from blood cultures. Methods: Fifty Candida spp were included to study. Camellia sinensis and Cydonia oblonga leaves collected from Rize and Erzurum/Tortum regions were prepared as an extract. Then stock solutions of the extracts and fluconazole powder obtained from the manufacturer were prepared for use in the Broth Microdilution (BMD) method according to Clinical and Laboratory Standards Institute (CLSI) M27 A3 recommendation. Fluconazole minimum inhibitory concentration (MIC) values obtained from BMD method were evaluated according to CLSI M27 A4 break points. MIC values obtained for Camellia sinensis and Cydonia oblonga were interpreted according to fluconazole break points since there is no break points in the literature. Results: Of the 50 Candida spp. included in the study, 37 (74%) were C. albicans while 13 (26%) were non-albicans species. The most common isolated non-albicans species was C. parapsilosis (14%). For all tested Candida strains MIC 50 and MIC 90 values for fluconazole were found to be 0.125 mu g/mL- 0.25 mu g/mL while they were determined as 0.125 mu g/mL-64 mu g/mL and 0.125 mu g/mL-0.125 mu g/mL for green tea and quince leaves, respectively. Conclusion: According to the low MIC values, it is seen that green tea and quince leaf are in vitro effective against Candida species. However, further extensive in vitro and in vivo studies should be done on the possibility that green tea and quince leaf can be used alternatively in the treatment of invasive Candida infections.
AtıfWoS1OpenAlex6İncele - MakaleAçık Erişim2021The Effect of Rosa pimpinellifolia Extract on the Proliferation of Human Tumor Cells
Demir, Elif Ayazoglu; Demir, Selim; Türkmen, Nihal; Turan, Ibrahim
The aim of this study was to evaluate the antioxidant properties of R. pimpinellifolia and its cytotoxic effect against human colon (WiDr), liver (HepG2) and lung (A549) cancer cells compared with a normal fibroblast (BJ) cell line. The antioxidant properties of extract was determined using spectrophotometric methods, while the cytotoxic effect of extract was evaluated using MTT assay. The total phenolic content, total flavonoid content and reducing power values of extract were calculated as 16.4 +/- 0.4 mg gallic acid equivalent, 5.2 +/- 0.2 mg quercetin equivalent and 34.3 +/- 2.4 mg trolox equivalent per g sample, respectively. Although the extract exhibits selective cytotoxic effect on three cancer cell lines in a dose-dependent manner compared to BJ cells, the highest selectivity index value (2.7-fold) was obtained for the WiDr cell line. In conclusion, this is the first study to demonstrate the cytotoxic effect of R. pimpinellifolia on cancer cells. To demonstrate the molecular mechanism of this cytotoxic effect and to carry out in vivo studies may be a guide for future clinical studies.
AtıfWoS3OpenAlex5TR Dizin1
İncele - MakaleAçık Erişim2022Urologists Are No Longer the Primary Surgeons for Several Urologic Operations: A National Survey Among the Turkish Urologists
Madendere, Serdar; Deger, Muslim Dogan; Demirkiran, Engin Denizhan; Yildiz, Huseyin Alperen
Objective: To investigate the role, interest, and competence of the Turkish urologists for urologic surgeries which are also performed by the other surgeons. Materials and Methods: We conducted a 22-item online survey and invited urologists by e-mail. Questions were asked to evaluate the attitudes, performances, and capabilities of the urologists in surgeries which could be performed by the other surgeons. Results: A total of 305 responses were evaluated. The female incontinence surgery, pediatric urologic surgery, and adrenal surgery are mostly performed by the urologists in their hospitals. Turkish urologists mostly do not perform the following surgeries and interventions themselves and refer patients to the other surgeons for a percutaneous nephrostomy (47.2%), urinary diversions using the intestinal segments (44.9%), kidney transplantation (11.8%), and the transgender surgeries (7.2%). Almost half of the urologists do not perform adrenal surgeries (50.2%). Most urologists agree that they should be the main surgeons for all these surgeries. Conclusion: Urologists are no longer the main surgeons for some surgeries which are included on the urologic curriculum. Many urologists avoid performing the major urologic surgeries. Urology educators should familiarize the new urologists with all the urologic surgeries.
- MakaleAçık Erişim2025Investigation of Physical and Cognitive Performance of Athletes
Çeviker, Abdulkerim; Turgut, Abdusselam; Zambak, Omer; Yanar, Muhammed Said; Çamiçi, Furkan; Ünlil, Cisem; Eroglu, Seref
This study aims to examine the relationship between physical performance levels and cognitive functions of male athletes aged 18-25 years competing in the Turkish Hockey Indoor 1st League. 45 athletes participated in the study, balance, flexibility and vertical jump tests and D2 Attention Test were applied. In addition to descriptive statistics, independent samples t-test, one-way analysis of variance (ANOVA) and Pearson correlation analysis were used to analyze the data. The results revealed that attention levels did not differ significantly according to age, education, sport experience and position (p>0.05). While there was no significant relationship between physical performance variables and attention, only vertical jump values showed a significant difference between the positions (p<0.05). In addition, positive and significant correlations were observed between the sub-dimensions of the attention test. In this context, it was concluded that not only physical criteria but also cognitive skills should be systematically included in the performance evaluations of hockey athletes.
AtıfOpenAlex2İncele - MakaleYalnız künye2009The Engineering Properties of Clays in Trabzon Tasonu Quarry
Ceryan, Nurcihan; Kesimal, Ayhan; Aydin, Ali
Tasonu limestone quarry located south of Arakli in Trabzon is the largest cement raw materials field in the Eastern Black Sea region. The quarry is run in the Kirechane Formation composed of limestone with various facies. However, it has been encountered three separate planar failures occurred between 2005 and 2006. Due to the failures, the amount of raw material production from the quarry has been gradually decreased. These failures occurred on clayey layers varying between 15 and 110 centimeter thicknesses. Therefore, the relevant clayey layers were examined in terms of geochmechanical and geophysical properties. The samples collected from the clayey layers are classified as high plasticity clay (CH) in accordance with the Unified Soil Classification System. Clay samples consist of 85 to 90 % montmorillonite and 10 to 15 % illite. The measurement of volumetric magnetic susceptibility used in the diversity of clay varies in the range 129-163x10(-6) cgs. These values have been analyzed with respect to the heavy metal pollution ratio of the clay and especially iron oxide depending on 3.6 to 6.8 % rates was the result. In this study, index and shearing strength values obtained from clayey level and filling material may be use for the investigation of the stability of quarry slopes during excavation.
AtıfWoS1İncele - MakaleAçık Erişim2026THREE LIVERWORT TAXA NEW TO AZERBAIJAN
Erata, Huseyin; Ayhan, Edanur; Mammadova, Aygun Vidadi; Ibadullayeva, Sayyara; Batan, Nevzat
The liverwort taxa Scapania calcicola, Barbilophozia hatcheri, and Porella cordaeana, are reported as new for Azerbaijan, following a recent bryological expedition to the Zagatala, Shabran and Astara of Azerbaijan. Brief descriptions, illustrations, geographic distribution, ecology and comparisons with morphologically similar species are presented.
- MakaleYalnız künye2011Scopus SJRQ1Assessment of natural radioactivity and mass attenuation coefficients of brick and roofing tile used in Turkey
Damla, N.; Cevik, U.; Kobya, A. I.; Celik, A.; Celik, N.; Yildirim, I.
In this study the distribution of natural radionuclides ((226)Ra, (232)Th, (40)K) in brick and roofing tile samples commonly used as building materials in Turkey was measured by using gamma spectrometry. The activity concentrations, radium equivalent activities (Ra(eq)), representative level index, indoor absorbed dose rate in air values and annual effective dose due to the intake of the above-mentioned radionuclides in the brick and roofing tile samples were estimated to assess the radiation hazard for people living in dwellings made of the materials studied. The measured average activity concentrations of (226)Ra, (232)Th and (40)K were 34 +/- 14, 34 +/- 13 and 462 +/- 175 Bq.kg(-1), respectively, for brick samples. For roofing tile, the average activity concentrations of (226)Ra, (232)Th and (40)K were measured to be 34 +/- 14, 33 +/- 12 and 429 +/- 161 Bq.kg(-1), respectively. The concentrations for these natural radionuclides were compared with the reported data of other countries. The Ra(eq) values of all samples were lower than the limit of 370 Bq.kg(-1), equivalent to a gamma dose of 1.5 mSv.a(-1) recommended by OECD. This study shows that the measured brick and roofing tile samples do not pose any significant source of radiation hazard and are safe to be used as building materials. Moreover, the experimental mass attenuation coefficients (mu/rho) of brick and roofing tile samples were determined in the energy range 80-1332 keV using the gamma ray transmission method. The experimental mass attenuation coefficients were compared with theoretical values obtained using XCOM. It was found that the computed values and the experimental results of this work are in good agreement with those reported in the literature. The chemical compositions and structural analysis (XRD) of the brick and roofing tile samples are also presented. (C) 2011 Elsevier Ltd. All rights reserved.
AtıfWoS35OpenAlex40İncele - MakaleAçık Erişim2020The examination of Yo-Yo intermittent recovery test performance of young soccer players at different playing positions
Bayrakdaroglu, Serdar; Ari, Erdal; Özkamçi, Huseyin; Can, Ibrahim
Purpose: The aerobic fitness in soccer is an important performance component. The aerobic endurance level of players may positively effect performance of critical match activities. The examination of Yo-Yo intermittent recovery test (YYIRT) performance of young soccer players at different playing positions was aimed in this study. Material: The research group was consisted of 75 young soccer players playing at U-21 category of professional soccer teams at different leagues. The soccer players at 5 different playing positions participated in study voluntarily (centerback: n=15, fullback: midfielder: n=15, winger: n=15, forward: n=15). The YYIRT (level 1) was performed for determination aerobic endurance parameters (covered distance during test, maximum oxygen uptake (VO2max) and maximal aerobic speed (MAS) of players. The one-way ANOVA analysis was used for comparison between playing positions of YYIRT parameters. Results: It was determined that difference between YYIRT parameters of players at different playing positions was non-significant (p>0.05). However, the midfielders covered more distance (2425,33 +/- 440,42 m) than forward (2146,67 +/- 339,64 m), winger (2137,33 +/- 615,18 m), fullback (2056,00 +/- 512,43 m) and centerback (1960,00 +/- 313,51 m) players. The positional requirements of midfielders may be decisive on covered distance during YYIRT. Conclusions: Consequently, it may be said that the young soccer players at different playing positions had similar YYIRT performance and the playing position effect on YYIRT performance could vary depending on league level and individual features of players.
AtıfWoS1OpenAlex6İncele - BildiriYalnız künye2025Scopus SJRQ2Investigation of antioxidant and antidiabetic activities of different extracts of Vitis labrusca fruit peels
Güntekin, D. Canbolat; Akmese, O.; Gültekin, E.; Bak, F. Ersen; Özkan, A. I.; Turan, I.; Demir, S.; Aliyazicioglu, Y.
