Browsing by Author "Şentürk T."

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    Impact of rheumatoid arthritis in Turkey: A questionnaire study
    (Clinical and Experimental Rheumatology S.A.S., 2014) Direskeneli H.; Akkoç N.; Bes C.; Çakir N.; Çefle A.; Çobankara V.; Dalkiliç E.; Dinç A.; Ertenli I.; Gül A.; Hamuryudan V.; Inanç M.; Kalyoncu U.; Karaaslan Y.; Kaşifoǧlu T.; Keser G.; Keskin G.; Kisacik B.; Kiraz S.; Masatlioǧlu S.; Onat A.M.; Özbek S.; Öztürk M.A.; Pamuk Ö.N.; Pay P.; Pirildar T.; Sayarlioǧlu M.; Şenel S.; Şentürk T.; Taşan D.; Terzioǧlu E.; Yazici A.; Yücel E.
    Objective: Unmet needs of rheumatoid arthritis (RA) patients regarding physician/patient communication, treatment preferences and quality of life issues were investigated in a Turkish survey study. Methods: The study was conducted with the contribution of 33 rheumatologists, and included 519 RA patients. The study population included patients who had been on biologic therapy for >6 months and were still receiving biologic therapy (BT group), and those who were biologic naive, but found eligible for biologic treatment (NBT group). Of the RA patients, 35.5% initially had a visit to an internal disease specialist, 25.5% to a physical therapy and rehabilitation specialist, and 12.2% to a rheumatology specialist for their RA complaints. The diagnosis of RA was made by a rheumatologist in 48.2% of patients. Results: The majority of RA patients (86.3%) visit their doctor within 15-week intervals. Most of the physician-patient communication focused on disease symptoms (99.0%) and impact of the disease on quality of life (61.8%). The proportion of RA patients who perceived their health status as good/very good/excellent was higher in the BT group than in the NBT group (74.3% vs. 51.5%, p<0.001). However, of those RA patients in the NBT group, only 24.8% have been recommended to start a biologic treatment by their doctors. With respect to dose frequency options, once-monthly injections were preferred (80%) to a bi-weekly injection schedule (8%). Conclusion: In conclusion, RA patients receiving biologic therapy reported higher rates of improved symptoms and better quality of life and seemed to be more satisfied with their treatment in our study. © Clinical and Experimental Rheumatology 2014.
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    Determination of some physicochemical parameteres and inorganic nutrient content of Gediz River (Manisa); [Gediz Nehri (Manisa)’nın bazı fiziko-kimyasal özellikleri ve inorganik besin içeriğinin belirlenmesi]
    (Turkish Biochemistry Society, 2015) Şentürk T.; Yıldız Ş.
    Objective: This present investigation aimed at assessing the water quality of the Gediz River located in western Turkey. Methods: Some physicochemical parameters and nutrient concentrations of the surface water of Gediz River were determined over a period of twelve months (October to September 2012) at 5 sampling sites along the river. Results: Data on some ions namely NH4-N, NO2-N, NO3-N and PO-34-P were measured. The pH, temperature, electrical conductivity (EC), salinity and dissolved oxygen were also determined to assess the chemical status and pollution levels of the river. The measured data were given as mean, maximum, minimum values, respectively. In this context; the ranges for Water temperature [17.95°C±1.37ºC (30.2-4.5)], pH [7.45±0.06 (8.11-6.66)], Dissolved Oxygen [3.84±0.65 mg/L (6.25-2.43)], Electrical Conductivity (E.C) [1051.4±216.07 μS/cm (3000-296)], Salinity [0,16±0,05 ppt (0,8-0,1)], Ammonium nitrogen (NH4-N) [1.772±0.8228 mg/L (4.642-0.057)], Nitrite nitrogen (NO2-N) [0.605±0.4224 mg/L (2.312-0.050)], Nitrate nitrogen (NO3-N) [46.014±44.9878 mg/L (151.965-2.855)], Phosphate phosphorus (PO-34-P) [5.489±3.6356 mg/L (20.350-0.190)] were found to be higher than the natural background levels for surface water. Conclusion: This indicates pollution of the river water samples from the areas studied. Our findings highlighted the deterioration of water quality of the river due to anthropogenic and agriculturel activities. © 2015, Turkish Biochemistry Society. All rights reserved.
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    Adsorbent effect of Chlorella vulgaris and Scenedesmus sp. (Chlorophyta) for the removal of some heavy metals and nutrients; [Bazı ağır metal ve nutrient gideriminde Chlorella vulgaris ve Scenedesmus sp. (Chlorophyta)’nin adsorbent etkisi]
    (Turkish Biochemistry Society, 2016) Şentürk T.; Yıldız Ş.
    Objective: The aim of present manuscript is to evaluate the efficiency of two microalgae strains -Chlorella vulgaris and Scenedesmus sp- in removal of some inorganic nutrients and heavy metals. Methods: For this aim the green microalgae (Chlorophyta), grown in controlled laboratory conditions, were used as biosorbent for the removal of six different concentrations of Antimony (Sb3+), Manganese (Mn2+), Copper (Cu2+), Nickel (Ni2+), Phosphate (PO43-) and Nitrate (NO3-) which are prepared in aqueous solutions at conc. 0.1-1 mM for PO43-; 5-30 mM for NO3-; 2,5-100 ppm for heavy metals. Besides, the effects of heavy metals and inorganic nutrients on the cell’s total carbohydrate and chlorophyll a-b content were investigated during 24 hours exposure. Results: According to the results, the average removal efficiency of Phosphate, Nitrate, Antimony, Manganese, Copper and Nickel on C. vulgaris biomass was determined 95.91%, 21.63%, 28.64%, 49.41%, 33.38% and 29.96% while 98.15%, 14.28%, 10.05%, 8.52%, 30.18% and 20.62% on Scenedesmus sp. cells, respectively. On the other hand, the average adsorption capacities of Sb3+, Mn2+, Cu2+, Ni2+, PO43- and NO3- ions were confirmed 0.18, 0.38, 0.28, 0.15, 1.18 and 9.30 mg g-1 by C. vulgaris and 2.99, 0.96, 11.50, 11.33, 0.75 and 4.56 mg g-1 by Scenedesmus sp. biomass. Conclusion: Result of this study suggests that Chlorella vulgaris and Scenedesmus sp. have a remarkable ability on removal of excessive nutrients and heavy metals at laboratory conditions. © 2016, Turkish Biochemistry Society. All rights reserved.
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    Determining the Binding Capacities of Cr (VI) and Zn (II) Ions of Oscillatoria sp.
    (Sakarya University, 2020) Sezgin G.; Yildiz Ş.; Şentürk T.
    This study aimed to determine the removal capacity for Cr (VI) and Zn (II) ions from high concentration of aqueous solutions by using Oscillatoria microalgae. In the biosorption process, live and dead Oscillatoria cells were exposed for 24 hours to Cr and Zn metals of different concentrations (2.5, 5 and 10 mg/L). In addition, chlorophyll-a analysis have been made to examine the effects on cell metabolism of chromium and zinc metals. The best metal removal percentages was obtained; of chromium ion is 46.74% with dead cells and for zinc ion 82.53% with living cells. Chlorophyll-a analysis shows that when the metals separately applied on Oscillatoria cells, chlorophyll-a content of organism increase but when metals together applied decrease of chlorophyll-a content was observed. For this study, Freundlich model best fitted the data for two metal ions with 1/n value <1. This study revealed that Oscillatoria cells were an effective adsorbent for removal of the two heavy metals, especially Zn ions from aqueous solutions due to its high efficiency of Zn adsorption. It shows that it is a kind of potential for this heavy metal removal operations. © 2020, Sakarya University. All rights reserved.