Scopus İndeksli Yayınlar Koleksiyonu

Permanent URI for this collectionhttps://hdl.handle.net/20.500.14901/696

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Citation - Scopus: 2
3D Settlement Analysis of Underpinning Piles Under Raft Foundation Subjected to Nonuniform Vertical Loading
(Springer Verlag, 2018) Kalpakcı, V.; Ozturk, Ş.; Algin, H.; Burak Ekmen, A.
Existing rafts under the design loads sometimes experience excessive settlements or confront such a possibility in the future if the modified functionality of building is induced to increase the foundation loading. Differential settlement and deflection may also be observed in case of eccentric loading especially when these structures are built on soft soils. One of such precedents was observed in a silo structure used as a cement plant located in Douala, Cameroon. The structure that is founded on deep, soft clay with high ground water table rests on a raft supporting the storage tanks located at one side of the building conveying non-uniform loading to the existing raft. In one and a half year after completion of the construction, the silo structure had significantly settled and deflected. The underpinning pile remediation system allowing the continuity of cement production is applied from the outside of building using the rigidly connected protruding reinforced concrete section as a capping beam. In this study, the entire foundation system is numerically analyzed using the presented 3D finite element (FE) models. The back-analyses are used for the calibration concurring with the actual measurements of settlement and deflection at the site. The foundation systems with and without the underpinning piles are compared with each other to reveal how the remedial improvement is achieved by the presented underpinning pile system. © Springer Nature Switzerland AG 2018.
Citation - Scopus: 4
Additive Manufacturing of Non-Ferrous Metals
(Springer Nature, 2024) Varol, T.; Güler, O.; Yıldız, F.; Suresh Kumar, S.
Non-ferrous metals such as titanium (Ti), nickel (Ni), cobalt (Co), aluminum (Al), copper (Cu) and their alloys have many advantages compared to ferrous metals due to their low density, high corrosion resistance and high strength. Ti and its alloys are mostly used in engine applications such as rotors, compressor blades, and hydraulic systems. Ni and its alloys are frequently preferred in areas such as transmission shafts and turbine blades due to corrosion resistance and magnetic properties. Although cobalt and its alloys are used in cutting and piercing equipment, especially due to their high hardness, they have also used in the fabrication of biomaterials, hard permanent magnets due to biocompatible and their magnetic properties. The excellent corrosion resistance, thermal conductivity and lightness of Al and its alloys compared to ferrous metals make it usable in almost all industrial areas. Copper and copper alloys are one of the main materials used in the fabrication of conductive materials and heat exchangers. For this reason, efforts to produce more qualified and cheaper non-ferrous metals are gaining importance day by day. Traditional methods such as casting, powder metallurgy and injection molding have been used in the fabrication of metal parts. These methods need too many secondary processes such as cutting, machining, grinding, sintering, etc. after production. Moreover, some difficulties are encountered in these processes of non-ferrous metals such as titanium. Additive manufacturing (AM) methods have been developed to overcome these and many challenges. These methods eliminate the disadvantages of methods such as casting methods where scrap loss is experienced and powder metallurgy and / or injection molding methods, where the production of complex and large parts is difficult and combining their advantages in a single method. In this method, engineering parts are made by layering on the layer and layers are formed by the use of powder or wire selectively melted by a laser source followed by cooling. In this regard, in this book chapter, the manufacturability of non-ferrous metals consisting of Ti, Ni, Co, Al, Cu and their alloys, which are frequently used in the industry by AM methods, the application areas of such non-ferrous metals produced by AM methods and the advantages of the products obtained by these methods will be discussed in detail. Moreover, the challenges encountered in the fabrication of the specified non-ferrous metals with AM methods and the procedures that can be done to overcome these difficulties will also be highlighted. © The Author(s), under exclusive license to Springer Nature Switzerland AG 2022.
The Alternative Methods for Disinfection of E. Coli
(Amer Inst Physics, 2016) Yetim, Tuba; Gormez, Arzu; Gurkok, Sumeyra
Recently, advanced oxidation processes have gained significant interest for bacterial inactivation. In the present study, the efficacy of sonolysis, photocatalysis and sonophotocatalysis was evaluated for disinfection of Escherichia coli O157:H7 strain. Sonophotocatalysis proved to be the most effective disinfection methods by generating greater amount of (OH)-O-center dot radical.
Citation - WoS: 22
Citation - Scopus: 22
Ameliorative Effect of Supplementation with L-Glutamine on Oxidative Stress, DNA Damage, Cell Viability and Hepatotoxicity Induced by 2,3,7,8-Tetrachlorodibenzo in Rat Hepatocyte Cultures
(Springer, 2012) Turkez, Hasan; Geyikoglu, Fatime; Yousef, Mokhtar I.; Celik, Kubra; Bakir, Tulay O.
The most potent of the dioxins, 2,3,7,8-tetrachlorodibenzo-p-dioxin (TCDD), is a persistent and ubiquitous environmental contaminant. And the health impact of exposure to TCDD is of great concern to the general public. Recent data indicate that l-glutamine (Gln) has antioxidant properties and may influence hepatotoxicity. The objective of the present study was undertaken to explore the effectiveness of Gln in alleviating the hepatotoxicity of TCDD on primary cultured rat hepatocytes. Gln (0.5, 1 and 2 mM) was added to cultures alone or simultaneously with TCDD (0.005 and 0.01 mM). The hepatocytes were treated with TCDD and Gln for 48 h. Then cell viability was detected by [3-(4,5-dimethyl-thiazol-2-yl) 2,5-diphenyltetrazolium bromide] (MTT) assay and lactate dehydrogenase (LDH) release, while total antioxidant capacity (TAC), total glutathione (TGSH) and total oxidative stress (TOS) levels were determined to evaluate the oxidative injury. The DNA damage was also analyzed by liver micronucleus assay (MN) and 8-oxo-2-deoxyguanosine (8-OH-dG). The results of MTT and LDH assays showed that TCDD decreased cell viability but not l-glutamine. TCDD also increased TOS level in rat hepatocytes and significantly decreased TAC and TGSH levels. On the basis of increasing doses, the dioxin in a dose-dependent manner caused significant increases of micronucleated hepatocytes (MNHEPs) and 8-OH-dG as compared to control culture. Whereas, in cultures exposured with Gln alone, TOS levels were not changed and TAC and TGSH together were significantly increased in dose-dependent fashion. The presence of Gln with TCDD modulated the hepatotoxic effects of TCDD on primary hepatocytes cultures. Noteworthy, Gln has a protective effect against TCDD-mediated DNA damages. As conclusion, we reported here an increased potential therapeutic significance of l-glutamine in TCDD-mediated hepatic injury for the first time.
Analysing Winter Olympic Medals Through Economic Variables: A Comprehensive Examination
(Atatürk University, 2024) Aygun, Murat; Savas, Yunus
The impact of economic development holds considerable significance across various domains, including the realm of sports, which has been extensively explored in existing literature. To establish this relationship between Olympic performance and economic factors, an examination was conducted on the medals obtained by countries during Winter Olympic Games spanning the game period from 1960 to 2018. The results of the Pedroni cointegration test signify the presence of a robust co-integration relationship across all test statistics conducted The Panel ARDL analysis reveals that Real GDP emerges as the singular influential factor affecting countries' medal scores in the long term, achieving statistical significance at the 1% level. Additionally, labor compensation exerts a discernible impact, albeit at a 10% significance level. Notably, in the short term, none of these variables exhibit any influence on medal scores, a finding corroborated by the results from the panel PMG analysis. Furthermore, among all variables examined, only Real GDP demonstrates Granger causality concerning medal scores. In contrast, none of the other variables exhibit a Granger causative relationship with medal scores. This profound insight underscores the specific and substantial role played by Real GDP in shaping the dynamics of medal scores, highlighting its unique influence on medal success.
Citation - WoS: 19
Citation - Scopus: 15
Analysis of Factors Affecting Individuals' Sources of Happiness with Multinomial Logistic Model
(Assoc Measurement & Evaluation Education & Psychology, 2021) Cebi Karaaslan, Kubranur
The happiness levels of individuals and their sources of happiness have been wondered a lot and researched from past to present. The aim of this study is to examine the factors that affect individuals' sources of happiness. The data set of the study was obtained from the Life Satisfaction Survey of the Turkish Statistical Institute. 9212 individuals were included in the study. In the study, chi-square independence tests were conducted to examine the relationship between the source of happiness and the independent variables included in the model, and multinomial logistic regression analysis was applied to determine the factors that may have an effect on the sources of happiness of individuals. As a result of the study, it has been determined that the factors of the individual's age, gender, marital status, educational status, satisfaction with income level, welfare level, life satisfaction, satisfaction with a social life are effective on sources of happiness. At such a time when it is clear that the coronavirus epidemic adversely affects many aspects of our lives, especially our psychology, and will leave a mark on our tomorrows, and the activities of decision-makers and policymakers are shed light through the study in order to increase the happiness of individuals and to ensure that the future will be better.
Citation - WoS: 1
Citation - Scopus: 2
An Analysis of the Gods and Heroes in Ancient Mesopotamian Art
(Atatürk Univ, 2024) Topaloglu, Yasin; Kilic, Murat
Mesopotamia, the region between the Euphrates and Tigris rivers, was home to many civilizations such as Sumer-Akkadian, Babylonia, and Assyria. Mesopotamian culture is based on a common religious view and consists of theocratic states ruled first by priest-kings. Mesopotamia is one of the crucial geographies where history is illuminated by art. This art reflects the feelings and thoughts of people and provides important clues about their world. The Sumerians' invention of writing was a significant development, but other developments and innovations in Mesopotamia also affected ancient societies such as the Middle East and Anatolia. Art is at the forefront of these developments and innovations. Centers such as G & ouml;beklitepe, Kurupay, Nevali & Ccedil;ori, & Ccedil;ay & ouml;n & uuml;, Hac & imath;lar, and Eriha-Jericho contain early examples of this art. Works of art such as the Vultures Stele, Ur Standard, Uruk Warka Vase, Naram-Sin Victory Stele, and Lion Hunt Stele are essential examples for our subject with their depictions of gods, kings, and heroes. This visual art of Mesopotamia is critical to the history of the Ancient Age as it provides information that thousands of written documents cannot convey. In Mesopotamian art, where gods and heroes (kings) are seen from the Neolithic Age to the Early Bronze Age, the concepts of gods and kings occupy a central place in art. However, it is also evident that these depictions developed and changed over time. Looking at these depictions, it is understood that while gods represent the spirit world and beliefs, heroes (king or emperor) symbolize earthly power. In these works of art, heroes are usually depicted as hunters, warriors, or kings. This heroism, which extends to the claim of god or godhood, reflects new administrative powers, economic prosperity, and military development.
Citation - WoS: 2
Citation - Scopus: 3
Antibacterial Activity of Essential Oils Extracted from Satureja Hortensis Against Selected Clinical Pathogens
(American Institute of Physics, 2017) Gormez, Arzu; Yanmis, Derya; Bozari, Sedat; Gurkok, Sumeyra
The antibiotic resistance of pathogenic microorganisms has become a worldwide concern to public health. To overcome the current resistance problem, new antimicrobial agents are extremely needed. The aim of the present study was to evaluate the antibacterial activity of Satureja hortensis essential oils against seven clinical pathogens. Chemical compositions of hydro distillated essential oils from S. hortensis were analyzed by GS-MS. The antibacterial activity was investigated against Corynebacterium diphtheria, Salmonella typhimurium, Serratia plymuthica Yersinia enterocolitica, Y. frederiksenii, Y. pseudotuberculosis and Vibrio cholerae by the use of disc diffusion method and broth micro dilution method. The minimum inhibitory concentration (MIC) values of essential oils were found as low as 7.81 mu g/mL. Notably, essential oils of S. hortensis exhibited remarkable antimicrobial activities against the tested clinical pathogens. The results indicate that these essential oils can be used in treatment of different infectious diseases.
Citation - Scopus: 25
Anticancer, Antioxidant and Cytotoxic Potential of Thymol in Vitro Brain Tumor Cell Model
(Bentham Science Publishers B.V. P.O. Box 294 Bussum 1400 AG, 2017) Aydın, E.; Türkez, H.; Taşdemir, Ş.; Hacımüftüoğlu, F.
Background: Thymol (THY), which is a monocyclic monoterpene, found in oil of thyme various other kinds of plants.Until today, although different biological properties of THY have been indicated, its neurological toxicity has never been investigated. Method: In this study, in vitro antiproliferative (by 3-(4,5 dimetylthiazol-2-yl)-2,5 diphenlytetrazolium bromide (MTT) test), genotoxic (by single cell gel electrophoresis (SCGE)) and oxidative effects (by total antioxidant capacity (TAC) and total oxidative status (TOS) analysis) of THY (0-400 mg/L) were assessed on cultured primary rat neurons (CPRNs) and N2a neuroblastoma cells. Results: The obtained data from MTT analysis revealed that THY (only at 400 mg/L) led to significant (p0.05) in both treated cell type as compared to control group. The present results also showed that 10, 25 and 50 mg/L of THY application into the cell cultures supported antioxidant capacity in primary rat neurons but not in N2a cells. Conclusion: In a conclusion, these results confirm that THY may have antiproliferative potential against brain tumor cells involving oxidative alteration. © 2017 Bentham Science Publishers.
Citation - WoS: 86
Citation - Scopus: 100
Antioxidative, Anticancer and Genotoxic Properties of Α-Pinene on N2a Neuroblastoma Cells
(Springer, 2013) Aydin, Elanur; Turkez, Hasan; Geyikoglu, Fatime
alpha-Pinene, an organic monoterpene, is found in essential oils of pine and coniferous trees. To date, although various biological activities of alpha-pinene have been demonstrated, its neurotoxicity has never been explored. Therefore in this study, we aimed to describe in vitro antiproliferative and/or cytotoxic properties by 3-(4,5-dimetylthiazol-2-yl)-2,5-diphenyltetrazolium bromide (MTT) test, genotoxic damage potentials by single cell gel electrophoresis, and oxidative effects by total antioxidant capacity (TAC) and total oxidative stress (TOS) analysis of alpha-pinene. Statistical analysis of MTT assay results indicated significant (p < 0.05) decreases of the cell proliferation rates in healthy neurons treated with alpha-pinene at only 400 mg/L, while significant decreases were observed in N2a cells at 100, 200 and 400 mg/L. On the other hand, the mean values of the total scores of cells showing DNA damage were not found significantly different from the control values on both cells. In addition, our results indicated that 10 and 25 mg/L of alpha-pinene treatment caused increases of TAC levels in primary rat neurons without any alterations of its level in N2a cells. However, alpha-pinene treatments at higher doses led to increases of TOS levels in both cell types. Overall our results suggest that alpha-pinene is of a limited therapeutic use as an anticancer agent.
Citation - WoS: 7
Citation - Scopus: 8
Application of Gov (Flow Peening) Process to Improve Surface Quality of Ti-6al of Aerospace Material
(Inderscience Enterprises Ltd, 2023) Kalak, Murat; Sahin, Burak; Gov, Ibrahim; Dogan, Abdurrahman; Gov, Kursad
Ti-6Al-4V is a difficult-to-cut material with wide applications due to its superior mechanical features. Non-traditional surface treatment methods namely abrasive flow machining and shot peening are applied to obtain desired surface quality. GOV (flow peening) process having advantages of surface quality and strength improvement (compressive residual stress generation) of AFM and shot peening respectively was developed. In this paper, the effects of the GOV process parameters (number of cycles, steel ball size, and media ratio) on the material surfaces were investigated to evaluate surface roughness (R-a), material removal amount and white layer thickness. The surface roughness, R-a value was decreased from 2.17 mu m to 0.80 mu m. In addition, 4.4 mg of material corresponds to total amount of white layer was removed (verified by SEM images). GOV process can be used to improve surface quality by decreasing surface roughness and removing white layer without any excess chip removal.
Citation - Scopus: 7
Assessing Postgraduate Students' Satisfaction with Quality of Services at a Turkish University Using Alternate Ordered Response Models
(Budapest University of Technology and Economics office@pp.bme.hu, 2018) Çelik, A.K.; Oktay, E.; Özen, U.; Karaaslan, A.; Yarbaşı, I.Y.
The aim of this study is to determine postgraduate students' general satisfaction with the quality of academic services. For this purpose, a written-questionnaire was conducted to 400 graduate students at Atatürk University, Turkey. The dependent variable of the study was the satisfaction level of graduate students which has a natural order. Hence, four different ordered logit models were performed to determine factors that may influence satisfaction levels of graduate students with the quality of academic services. Along with standard ordered logit model, other alternative ordered response models were also performed including generalized ordered logit model, partial constrained generalized ordered logit model, and heterogeneous choice model. Results reveal that a variety of factors are associated with quality of higher education services including age group, tuition fee, undergraduate education, monthly individual income, monthly household income, type of graduate school, current status of postgraduate education, advisor's academic degree, and time elapsed for postgraduate education. The outcome of this study may give a valuable information for decision-makers of higher education institutions and may provide a benchmarking option in terms of past, present and future higher education policies. © Budapest University of Technology and Economics 2018. All rights reserved.
Assessment of Mechanical and Physical Properties of Natural Hydraulic Binders Produced from Marls
(Trans Tech Publications Ltd, 2025) Özer, N.; Acun Özgünler, S.A.
In the 18th century, hydraulic-based binders gradually supplanted air-hardening binders, and by the early 20th century, these were eventually replaced by cement. The distinction between binders categorized as natural and other hydraulic binders, such as natural cement and conventional cement, is that the former is characterized by raw materials with a naturally favorable mineralogical composition. This study examined the experimental possibilities of natural hydraulic binder production with marl resources commonly found in Turkey. Two raw materials quarried from Mersin (M) and Adana (A) were selected. These raw materials were calcined at temperatures of 750-850-950-1050 °C. The X-ray diffraction (XRD) analysis indicates that while the binders produced with M-coded raw materials contain varying amounts of the hydraulic phases larnite (C2S and C3S), the A-coded binders exhibit an absence of these critical hydraulic phases, which are essential for strength development in hydraulic binder paste. The increase in the strength of A-coded binders is thought to be due to the formation of calcium silicate hydrate (C-S-H) phases, which result from the reaction between water, clay minerals (SiO2, Al2O3, and Fe2O3), and hydrated lime (portlandite, Ca (OH)2). © 2025 Trans Tech Publications Ltd, All Rights Reserved.
Assessment of Physical Fitness of Primary School Students
(T.C. Milli Egitim Bakanligi, 2022) Buzdağli, Y.; Tamer, K.
The purpose of this study was to determine the physical fitness levels of primary school students in the 7-10 years age group. A total of 962 students (498 girls, 464 boys), 7-10 years age group studying at primary schools in Erzurum participated in the study. The students who participated in the research were tested for height, body weight, body mass index, vertical jump, 30 sec sit-ups, 30 sec push-ups, flexibility, flamingo balance, 20 m speed run as well as 800 m runwalk test in 7, 8 and 9 age groups and 1600 m run-walk test in 10 years age group. Two-way ANOVA analysis was used to compare the characteristics of different gender in the same age group to test whether the data obtained from the subjects discriminate between gender and age groups and one-way ANOVA analysis was conducted to identify differences between age groups in the same sex. In case of significant difference, Tukey test was used for multiple comparison tests. Pearson correlation test was used to search the relation between the parameters. When all the results of the study were assessed, a rapid increase found in the performances of the girls at an earlier age than the boys. For boys, strength, speed, vertical jump, sit-ups and anaerobic power values were found to be higher than girls. Depending on the physical development, an increase in speed and jump is observed in both girls and boys, as well as an increase in muscular strength in boys. © 2022. Milli Egitim. All Rights Reserved.
Citation - WoS: 11
Citation - Scopus: 12
Astrocyte/Neuron Ratio and Its Importance on Glutamate Toxicity: An in Vitro Voltammetric Study
(Springer, 2016) Hacimuftuoglu, Ahmet; Tatar, Abdulgani; Cetin, Damla; Taspinar, Numan; Saruhan, Fatih; Okkay, Ufuk; Suleyman, Halis
The purpose of this study was to clarify the relationship between neuron cells and astrocyte cells in regulating glutamate toxicity on the 10th and 20th day in vitro. A mixed primary culture system from newborn rats that contain cerebral cortex neurons cells was employed to investigate the glutamate toxicity. All cultures were incubated with various glutamate concentrations, then viability tests and histological analyses were performed. The activities of glutamate transporters were determined by using in vitro voltammetry technique. Viable cell number was decreased significantly on the 10th day at 10(-7) M and at 10(-6) M glutamate applications, however, viable cell number was not decreased at 20th day. Astrocyte number was increased nearly six times on the 20th day as compared to the 10th day. The peak point of glutamate reuptake capacity was about 2 x 10(-4) M on the 10th day and 10(-3) M on the 20th day. According to our results, we suggested that astrocyte age was important to maintain neuronal survival against glutamate toxicity. Thus, we revealed activation or a trigger point of glutamate transporters on astrocytes due to time since more glutamate was taken up by astrocytes when glutamate transporters on the astrocyte were triggered with high exogenous glutamate concentrations. In conclusion, the present investigation is the first voltammetric study on the reuptake parameters of glutamate in vitro.
Citation - WoS: 1
Beta-T Models for Exchange Rate Volatility Modelling: An Evaluation on the US Dollar / Turkish Lira Exchange Rate
(Sosyoekonomi Soc, 2023) Bekar, Engin
To compare different risk measurement methods, in this study, the US Dollar, which is important in terms of being one of the most preferred investment instruments in Turkey and being a reserve currency, is under review. First, EGARCH (1,1) and GJR-GARCH (1,1) models were estimated using the return data based on the US Dollar / Turkish Lira exchange rate for the 2005 -2021 period. Then, the "Beta-t-EGARCH and Its Variants", which have been introduced in recent years, fit well with the characteristics of the exchange rate series and, most importantly, are robust to extreme values and jumps in volatility have been estimated with the expectation of being able to calculate the exchange rate risk more accurately. As a result, it was determined that the model that best met the purpose of the study was the "Two-Component Beta-Skew-t-EGARCH Model with Leverage". The study is important because it draws attention to the effect of extreme values and fluctuations in the Turkish foreign exchange market volatility.
Citation - WoS: 4
Citation - Scopus: 5
Biosafety Evaluation of Nanoparticles in View of Genotoxicity and Carcinogenicity Studies: A Systematic Review
(Trans Tech Publications Ltd, 2013) Turkez, Hasan; Celik, Kubra; Cakmak, Bulent
Nanoparticles (NPs) are used in various forms in consumer products including, cosmetics, food packaging, textiles and also in air and water cleaning, production of electro chromic windows, or smart windows and gas sensors. Many NPs have also been evaluated for potential use in biomedical applications as efficient delivery carriers for cancer diagnosis and therapy. Nowadays, NPs are being developed to create fascinating nanotechnology products. To develop NPs for broad applications, potential risks to human health and the environment should be evaluated and taken into consideration. Again, to translate these nanomaterials to the clinic and industrial domains, their biosafety needs to be verified, particularly in terms of genotoxic and carcinogenic effects. To evaluate evidenced-based practices for NPs safety, we performed a systematic review of the published English-language literature. We performed a systematic keyword search of PubMed for original research articles pertaining to reports on assessment of risks due to carcinogenic and mutagenic effects by different NPs. We identified 362 original articles available for analysis. The included studies were published between 1993 and 2012. The in vivo or in vitro genotoxicity studies were performed on only 18 out of 148 kinds of NPs in industry today. Likewise, the carcinogenicity investigations were performed on only 14 out of 148 NPs. The 10 types of the NPs including some titanium, aluminium, carbon black and silver molecules were found to have both mutagenic and carcinogenic potential. The important finding was also that there is a lack of systematic assessment of the DNA damaging and carcinogenic potential of NPs in spite of their extensive use in nanotechnological applications.
Citation - WoS: 6
Citation - Scopus: 5
Bn-TiO2 Multilayer Coating on Az91 for Enhanced Corrosion Performance in Marine Environments
(Univ Fed Rio de Janeiro, Lab Hidrogenio, 2024) Meletlioglu, Emrah; Comakli, Onur
Magnesium alloys have recently been used in marine applications due to an attractive combination of low density and high strength/weight/ratio. However, the corrosion resistance of magnesium alloys should be improved for practical applications. In this study, BN-TiO2 multilayer films were deposited with different numbers of bilayers (2 and 4) on AZ91 magnesium alloys to enhance the corrosion resistance of magnesium alloys in marine environments. The microstructure and wettability properties of uncoated and multilayer film-coated alloys were comparatively investigated via XRD, SEM, AFM, and contact angle measurement systems. The corrosion performance of uncoated and coated samples has also been evaluated using electrochemical polarization and impedance measurements in artificial seawater. The corrosion performance values of multilayer film-coated alloys were better than the uncoated alloy values. Corrosion resistance and hydrophobicity of coated samples also increased with the number of bilayers owing to the smaller grain size, increased layered interfaces, and high structural density.
Citation - WoS: 6
Citation - Scopus: 6
Body Composition Isokinetic Knee Extensor Strength and Balance as Predictors of Competition Performance in Junior Weightlifters
(IOS Press, 2020) Ince, I.; Ulupinar, S.; Ozbay, S.
BACKGROUND: Although it is known that isokinetic knee extensor strength and balance ability are important, valid and reliable parameters, they have not been used hitherto to predict the performance of junior weightlifters. OBJECTIVE: To investigate the relationship among body composition, isokinetic knee extensor strength, balance, and weightlifting performance and to determine whether these factors predict competition performance in junior men weightlifters. METHODS: Fifty-one male junior weightlifters (age: 15.9 +/- 1.2 years, height: 161.9 +/- 7.7 cm, body mass: 62.7 +/- 11.3 kg) participated in this study. Participants performed isokinetic knee extensor strength tests in concentric mode (at 60 and 180 degrees/s) and balance tests (static and dynamic). Competition performance was calculated according to the Sinclair equation, which was used as the dependent variable in the statistical analysis. The extent to which the independent variables predicted competition performance was determined by bivariate correlations and multiple linear regression analysis. RESULTS: Significant correlations were found between the Sinclair score and the independent variables (r = 0.496-0.804, p < 0.05). Three models were fitted by hierarchical linear regression analysis. Body fat percentage was determined as a control variable in step one, isokinetic knee extensor strength at 180 degrees/s was included in step two, and static balance was included in step three, with all three contributing to the models significantly (p = 0.0001, p = 0.0001, and p = 0.003, respectively). The variance of competition performance was explained by approximately 65% in step one, approximately 78% in step two, and approximately 82% in step three. CONCLUSIONS: The results of this study suggest that isokinetic knee extensor strength, static balance, and body fat percentage are effective for predicting competition performance in junior weightlifters.
Citation - WoS: 6
Citation - Scopus: 6
Cao Nanoparticle Enhances the Seedling Growth of Onobrycis Viciifolia Under Drought Stress Via Mannitol Use
(Springer, 2023) Ertus, Mehmet Macit; Yazicilar, Busra
Nanoparticles (NPs) of CaO (Ca2+) are significant components that act as signal transductors in plants' adaptive and developmental processes. The responses of two different landrace varieties (Uzuntekne and Baris) of Onobrychis viciifolia to the mannitol stress of CaO NPs were investigated in this study. Their response to various morphological and physiological processes under in vitro conditions was analyzed in this study. Two Onobrychis viciifolia cultivars were used in the presence of 50 and 150 mM of mannitol, including 0.5 ppm and 1.5 ppm Ca2+ nanoparticles. The effects of CaO NPs were induced by mannitol which, root, stem, leaf development, MDA, H2O2, chlorophyll content, gene expression, and SEM images were determined for the in vitro seedlings. CaO remarkably increased the activation of growth parameters in two tested cultivars. Synergistic treatments of NPs affected the seedlings more than the sole treatments. In terms of MDA, H2O2, and chlorophyll content, it was found that the Ca2+ NPs treatment was significant, and it exhibited a high level related to the resistance degrees of cultivars. The chlorophyll content demonstrated a reducing trend in response to increasing concentrations of mannitol. However, there were significant differences between the control group samples and the CaO mannitol treatment samples in response to H2O2 and MDA. The gene expression analysis revealed that MtdDehyd and MtRD2 genes were expressed at various degrees in the seedlings of two Onobyrchis cultivars subjected to drought treatments. Improving resistance to drought stress in tested cultivars can be regulated by expressing MtdDehyd and MtRD2 genes in vitro conditions. SEM images in stomatal structures of cells were easily changed in the mannitol treatment samples in the presence of CaO, and a different stress severity level was detected in their control treatments.

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