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        • SCIESCOPUSKCI등재

          Microbial Flora of Normal and Abnormal Cervical Mucous Discharge Associated with Reproductive Performance of Cows and Heifers in Estrus

          Ata,,Ayhan,Turutoglu,,Hulya,Kale,,Mehmet,Gulay,,Mehmet,Sukru,Pehlivanoglu,,Faruk Asian Australasian Association of Animal Productio 2010 Animal Bioscience Vol.23 No.8

          The aim of the present study was to describe whether abnormal cervical mucus discharge (A-CMD) or pathogens in cervical mucus discharge (CMD) have effects on reproductive performance of cows and heifers in estrus. Animals having clear discharges (68 cows, 38 heifers) with normal viscosity and without bad odor were grouped as normal cervical mucous discharge (N-CMD) group. The other animals (84 cows, 32 heifers) were grouped as A-CMD group. Microorganisms isolated from samples were divided into three groups as uterine pathogens (UP), potential uterine pathogens (PUP) or opportunistic uterine pathogens (OUP). Presence of PUP was associated with A-CMD for both cows (p<0.01) and heifers (p<0.02). First service conception rates (FS-CR) were lower in cows positive for PUP (p<0.01). Moreover, presence of PUP and OUP affected FS-CR in heifers (p<0.01). Although A-CMD significantly affected FS-CR in cows (p<0.04), it did not affect FS-CR in heifers. Differences in average open day for cows (p<0.02) and first service age for heifers (p<0.01) were significant between N-CMD and A-CMD groups, respectively. The current study suggested that CMD should be evaluated more carefully when there are infertility problems. In addition to the known microorganism that causes sterility and infertility in the UP group, pathogens in the PUP group should be considered for their potential to cause infertility.

        • KCI등재SCOPUS

          Interfacial stress assessment at the cracked zones in CFRP retrofitted RC beams

          Ata,Hojatkashani,Mohammad,Zaman,Kabir 국제구조공학회 2012 Structural Engineering and Mechanics, An Int'l Jou Vol.44 No.6

          In this work, an experimental examination was carried out to study interfacial stresses developed at the junction zones between carbon fiber reinforced plastic (CFRP) fabrics (~1 mm thickness) and tensile concrete portion in CFRP retrofitted RC beams. In this respect, initially six similar RC beams of 150 × 150 × 1000 mm dimensions were prepared. Three of which were strengthened with CFRP fabrics at the tensile side of the beams. Furthermore, a notch was cut at the center of the bottom surface for all of the studied beams. The notch was 15 mm deep and ran across the full width of tension side of the beams. The mentioned interfacial stresses could be calculated from strains measured using strain gauges mounted on the interface zone of the tensile concrete and the CFRP sheet. Based on the results obtained,it is shown that interfacial stresses developed between CFRP fabrics and RC beam had a noticeable effect on debonding failure mode of the latter. The load carrying capacity of CFRP strengthened RC specimens increased ~75% compared to that of the control RC beams. This was attributed to the enhancement of flexural mode of the former. Finally, finite element analysis was also utilized to verify the measured experimental results.

        • KCI등재SCIESCOPUS

          Hybrid fuzzy model to predict strength and optimum compositions of natural Alumina-Silica-based geopolymers

          Ata,Allah,Nadiri,Somayeh,Asadi,Hamed,Babaizadeh,Keivan,Naderi 사단법인 한국계산역학회 2018 Computers and Concrete, An International Journal Vol.21 No.1

          This study introduces the supervised committee fuzzy model as a hybrid fuzzy model to predict compressive strength (CS) of geopolymers prepared from alumina-silica products. For this purpose, more than 50 experimental data that evaluated the effect of Al2O3/SiO2, Na2O/Al2O3, Na2O/H2O and Na/[Na+K] on (CS) of geopolymers were collected from the literature. Then, three different Fuzzy Logic (FL) models (Sugeno fuzzy logic (SFL), Mamdani fuzzy logic (MFL), and Larsen fuzzy logic (LFL)) were adopted to overcome the inherent uncertainty of geochemical parameters and to predict CS. After validating the model, it was found that the SFL model is superior to MFL and LFL models, but each of the FL models has advantages to predict CS. Therefore, to achieve the optimal performance, the supervised committee fuzzy logic (SCFL) model was developed as a hybrid method to combine the benefits of individual FL models. The SCFL employs an artificial neural network (ANN) model to re-predict the CS of three FL model predictions. The results also show significant fitting improvement in comparison with individual FL models.

        • KCI등재후보SCOPUS

          Microbial Flora of Normal and Abnormal Cervical Mucous Discharge Associated with Reproductive Performance of Cows and Heifers in Estrus

          Ayhan,Ata,Hülya,Türütoğlu,Mehmet,Kale,Mehmet,Şükrü,Gülay,Faruk,Pehlivanoğlu 아세아·태평양축산학회 2010 Animal Bioscience Vol.23 No.8

          The aim of the present study was to describe whether abnormal cervical mucus discharge (A-CMD) or pathogens in cervical mucus discharge (CMD) have effects on reproductive performance of cows and heifers in estrus. Animals having clear discharges (68 cows, 38 heifers) with normal viscosity and without bad odor were grouped as normal cervical mucous discharge (N-CMD) group. The other animals (84 cows, 32 heifers) were grouped as A-CMD group. Microorganisms isolated from samples were divided into three groups as uterine pathogens (UP), potential uterine pathogens (PUP) or opportunistic uterine pathogens (OUP). Presence of PUP was associated with A-CMD for both cows (p<0.01) and heifers (p<0.02). First service conception rates (FS-CR) were lower in cows positive for PUP (p<0.01). Moreover, presence of PUP and OUP affected FS-CR in heifers (p<0.01). Although A-CMD significantly affected FS-CR in cows (p<0.04), it did not affect FS-CR in heifers. Differences in average open day for cows (p<0.02) and first service age for heifers (p<0.01) were significant between N-CMD and A-CMD groups, respectively. The current study suggested that CMD should be evaluated more carefully when there are infertility problems. In addition to the known microorganism that causes sterility and infertility in the UP group, pathogens in the PUP group should be considered for their potential to cause infertility.

        • KCI등재

          Understanding predictor effects of computational thinking skills and media and technology use and attitudes of pre-service teachers for STEM awareness

          Rıdvan,Ata,Mustafa,Çevik 한국교육개발원 2020 KEDI Journal of Educational Policy Vol.17 No.1

          This study proposes and tests a model that explains STEM awareness of pre-service teachers by examining computational thinking skills, media and technology use and attitudes, and demographic variables including gender, high school type and parent educational background. A total of 337 participants who enrolled in education faculties at three state universities in different regions of Turkey participated in the study. “STEM Awareness Scale”, “Computational Thinking Skills Scale”, “Media and Technology Use and Attitudes Scale” and demographic information forms were used as data collection instruments. The data were analyzed through statistical tests including structural equation modelling. Fit indices of the established model were within an acceptable range. Analysis demonstrated a positive relation amongst computational thinking and media and technology use and attitudes and STEM awareness. In addition, results of structural equation modeling revealed that these factors were significant predictors of STEM awareness. Similarly, the study found that STEM awareness was significantly predicted by some demographic variables such as majors, age, and mother's educational background. Recommendations for educationalists and policymakers are proposed.

        • SCIESCOPUSKCI등재후보

          Interfacial stress assessment at the cracked zones in CFRP retrofitted RC beams

          Hojatkashani,,Ata,Kabir,,Mohammad,Zaman Techno-Press 2012 Structural Engineering and Mechanics, An Int'l Jou Vol.44 No.6

          In this work, an experimental examination was carried out to study interfacial stresses developed at the junction zones between carbon fiber reinforced plastic (CFRP) fabrics (~1 mm thickness) and tensile concrete portion in CFRP retrofitted RC beams. In this respect, initially six similar RC beams of $150{\times}150{\times}1000mm$ dimensions were prepared. Three of which were strengthened with CFRP fabrics at the tensile side of the beams. Furthermore, a notch was cut at the center of the bottom surface for all of the studied beams. The notch was 15 mm deep and ran across the full width of tension side of the beams. The mentioned interfacial stresses could be calculated from strains measured using strain gauges mounted on the interface zone of the tensile concrete and the CFRP sheet. Based on the results obtained, it is shown that interfacial stresses developed between CFRP fabrics and RC beam had a noticeable effect on debonding failure mode of the latter. The load carrying capacity of CFRP strengthened RC specimens increased ~75% compared to that of the control RC beams. This was attributed to the enhancement of flexural mode of the former. Finally, finite element analysis was also utilized to verify the measured experimental results.

        • KCI등재

          Optimization and modeling of zinc borate (2ZnO 3B_2O_3 3.5H_2O) production with the reaction of boric acid and zinc oxide

          Osman,Nuri,Ata,Enes,Sayan,Bengul,Engin 한국공업화학회 2011 Journal of Industrial and Engineering Chemistry Vol.17 No.3

          Production of zinc borate from boric acid was investigated in aqueousmedia. Zinc oxide and zinc borate are used as seed crystal to convert all the zinc oxide and to get a high reaction rate. The effect of some parameters such as temperature, stirring speed, H_3BO_3-to-ZnO ratio, % seed crystal/(H_3BO_3 + ZnO) and time was studied on zinc borate production by using the 251 fractional factorial design and central composite design methods. The chosen experimental parameters and their ranges were as follows:reaction temperature, 68–102 ℃ stirring speed, 333–767 rpm; H_3BO_3-to-ZnO ratio, 3–10; % seed crystal/(H_3BO_3 + ZnO), 0–1; time, 60–200 min. A statistical model for production of zinc borate was developed between the zinc oxide conversion and relevant parameters bymeans of variance analysis by using the Matlab computer software. This model was used to determine optimum production conditions. The optimum conditions for production of the zinc borate from boric acid in aqueous media were determined to be as follows: reaction temperature, 85 8C; stirring speed, 766 rpm; H_3BO_3-to-ZnO ratio,10; % seed crystal/(H_3BO_3 + ZnO), 1 × 10^3, reaction time, 183 min. Under the optimum conditions, the calculated zinc oxide conversion was approximately 99%.

        • KCI등재

          Effect of acute and chronic exercise on plasma matrix metalloproteinase and total antioxidant levels

          Melek,Tunc-Ata,Mukaddes,Mergen-Dalyanoglu,Sebahat,Turgut,Günfer,Turgut 한국운동재활학회 2017 JER Vol.13 No.5

          The relationship between acute and chronic exercise and expression of matrix metalloproteinases (MMPs) in muscles is unknown. There happen some alterations in the oxidant-antioxidant balance due to ex-ercise. This study aimed to investigate the levels of MMP-1, tissue in-hibitors of metalloproteinases (TIMP-1), hyaluronic acid (HA), total anti-oxidant status (TAS), and total oxidant status (TOS) following acute and chronic exercising in rats. Twenty-six Wistar Albino male rats were di-vided in to three groups: control, acute, and chronic groups. In acute group, treadmill exercise was performed 3 days/wk, 10 min/day for 1 week. In chronic group, exercise performed 7 days/wk, 60 min/day for 4 weeks. At the end of the experiment, plasma MMP-1, TIMP-1, HA, TAS, and TOS levels were measured. In current study, the MMP-1, TIMP-1, HA, and TOS levels not observed statistically significant difference among all groups, but in chronic group, there was a significantly differ-ence (P<0.05) between the control and experimental groups in terms of TAS and oxidative stress index (OSI) levels. TAS, TOS, and OSI levels were significantly different between control and chronic exercise group (P<0.01, P<0.05, and P<0.01, respectively). According to these results, we can say acute and chronic exercise does not effect on plasma MMP-1, TIMP-1, and HA levels.

        • KCI등재SCOPUS

          Emerging Roles of the Endolumenal Functional Lumen Imaging Probe in Gastrointestinal Motility Disorders

          ( Rona M Ata-lawenko ), ( Yeong Yeh Lee ) 대한소화기기능성질환·운동학회(구 대한소화관운동학회) 2017 Journal of Neurogastroenterology and Motility (JNM Vol.23 No.2

          Gastrointestinal sphincters play a vital role in gut function and motility by separating the gut into functional segments. Traditionally, function of sphincters including the esophagogastric junction is studied using endoscopy and manometry. However, due to its dynamic biomechanical properties, data on distensibility and compliance may provide a more accurate representation of the sphincter function. The endolumenal functional lumen imaging probe (EndoFLIP) system uses a multi-detector impedance planimetry system to provide data on tissue distensibility and geometric changes in the sphincter as measured through resistance to volumetric distention with real-time images. With the advent of EndoFLIP studies, esophagogastric junction dysfunction and other disorders of the stomach and bowels may be better evaluated. It may be utilized as a tool in predicting effectiveness of endoscopic and surgical treatments as well as patient outcomes. (J Neurogastroenterol Motil 2017;23:164-170)

        • KCI등재

          Examination of levels pentraxin-3, interleukin-6, and C-reactive protein in rat model acute and chronic exercise

          Melek,Tunc-Ata,Gunfer,Turgut,Mukaddes,Mergen-Dalyanoglu,Sebahat,Turgut 한국운동재활학회 2017 JER Vol.13 No.3

          Different types of exercise occurs damage at the cellular level in the muscles. Muscle damage caused by exercise is determined creatine kinase, myoglobin, and increase in levels of acute phase protein and in-terleukin in blood. The purpose of this study was investigated the levels of pentraxin-3 (PTX-3), interleukin-6 (IL-6), and C-reactive protein (CRP) following acute and chronic exercising in rats. Twenty-six Wistar Albino male rats were divided in to three groups. A treadmill exercise was per-formed 3 days/week, 10 min/day for 1 week in acute groups. In chronic group, exercise performed 7 days/week, 60 min/day for 4 weeks. At the end of the experiment, plasma PTX-3, IL-6, and CRP levels were mea-sured. In current study, the PTX-3, IL-6, and CRP levels not observed statistically significant difference among control, acute, and chronic groups. The levels IL-6 and CRP were not significantly different between acute and chronic exercise groups (P>0.05). However, the level of PTX-3 was found to be higher in the chronic group compared to the acute group (P<0.05). The PTX-3 level increase on chronic exercise-induced muscle damage. Accorting to our results, we think that PTX-3 may have a protect role on muscle damage during chronic exercises.

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