Algler hayatın her alanında özellikle endüstride sıkça kullanılan bir canlı grubudur. Çok farklı ... more Algler hayatın her alanında özellikle endüstride sıkça kullanılan bir canlı grubudur. Çok farklı hücresel şekilleri vardır ve farklı habitatlarda ve yüzeylerde üreyebilirler. Doğada kolaylıkla kendiliğinden çoğalabilen algler, laboratuvar koşullarında çok steril ve dikkatli çalışılmanın sonucunda saf kültür olarak çoğalabilirler. Günümüzde biyoteknoloji alanında; biyodizel üretiminde, yenilebilir biyoplastik yapımında, balık yemi ve besin olarak, mikrobiyal gübre ve kozmetikler gibi daha pek çok çeşitli çalışmalarda kullanılan algler için farklı üretim teknikleri geliştirilmiştir. Bu üretim teknikleri yüksek maliyetlidir ve ekonomik sebeplerle istenilen miktarlarda çoğaltılamamaktadır, bilimsel çalışmalar sekteye uğramaktadır ve okullarda birçok öğrenci projesi yürütülememektedir. Özellikle ortaöğretim okullarında yapılacak bilimsel çalışmalar için alg üretmek bu nedenle sorun olabilmektedir. Buna çözüm olarak evsel bitkisel atıklar kullanılarak hazırlanacak bir alg besi ortamı hem daha ucuz hem de kolay ulaşılabilir olacaktır. Bu nedenle özellikle bitkisel atıklardan salatalık, portakal ve benzeri sebze ve meyvelerin atıkları kullanılarak alg üretimi gerçekleştirilmiştir. Yapılan çalışmalar göstermiştir ki; %20 oranında portakal atığı, %5 ve %10 oranında yumurta kabuğu özütü içeren ortamlar BG-11 besi ortamı yerine alternatif olarak kullanılabilecek besi ortamlarıdır.
The aim of this study was to adapt 'Biology Attitude Questionnaire' which was developed by Prokop... more The aim of this study was to adapt 'Biology Attitude Questionnaire' which was developed by Prokop. 242 high school students from Ankara, Turkey participated in the study. Exploratory and confirmatory factor analysis were performed in order to determine the structural validity of the six dimensional scale. As a result, the final structure of the scale was found to be consisting of three factors and 22 items. The Alpha coefficients of the three factors were found to be 0.882 for the first factor-importance of biology, 0.854 for the second factor-progress of biology lessons and 0.828 for the third factor-interest toward biology.
For this research, samples were collected from four station in Badam Dam Reservoir (Kazakhstan). ... more For this research, samples were collected from four station in Badam Dam Reservoir (Kazakhstan). With the aim of identifying algae species that are indicator of reservoir pollution, samples were tested for presence of different kinds of algae in August 2012 and October 2013. As a result of laboratory work, 75, 32, 3, 22, 3 and 4 taxon were identified belonging to Bacillariophyta, Chlorophyta, Chrysophyta, Cyanobacteria, Euglenophyta and Pyrrophyta families respectively; summing up to 139 taxon in total. Dominance, frequency and similarity analysis were performed for algae species and diversity index (Shannon-Weaver, Simpson, Pielou ve Margalef index) was calculated for each. Bacillariophyta family is shown to constitute the dominant group among species. According to the established data, Nitzschia sp. from Bacillariophyta family had shown to be the genus that had the highest species variety with 12 taxon it has. It was followed by Navicula sp. (8 taxon), Cymbella sp. ve Gomphonema sp. (6 taxon each) and Scenedesmus sp. and Oocystis sp. (5 taxon each) from Chlorophyta family. The most dominant species were detected to be Fragilaria ulna, Amphora ovalis and Navicula radiosa; and were followed by Melosira varians, Navicula menisculus, Cyclotella meneghiniana, Cocconeis pediculus, Amphora veneta and Cymbella affinis species. Physicochemical parameters of Badam Dam Reservoir were also investigated in this research. When data for physico-chemical parameters were evaluated according to "Water Pollution Control Regulation" and the "National and International Drinking Water Quality Standards", Class-I water quality was obtained. But nitrate nitrogen (NO 3) level which fits the Badam Dam Reservoir to Class-IV water quality. The reason behind this situation was thought to be high nitrate NO 3 levels, agricultural activities around the dam and leakage of utilized chemicals into the reservoir. As an outcome of this research, Badam Dam Reservoir was detected to be an oligotrophic lake.
In this study, it is aimed to determine and compare the varieties of indicator algae that may be ... more In this study, it is aimed to determine and compare the varieties of indicator algae that may be of economic importance in Sarısu Creek which is born from Olympos Mountains and poured into Antalya Bay. Samples from 3 stations from epirhitral region to potamal area in Sarısu Creek samples were collected from different habitats including epilithic, epiphytic and epipelic. In the Sarisu Creek, a total of 72 algal taxa are identified. It is observed that Bacillariophyta division with 54,1%, is the most represented group, while Chlorophyta 25,2%, Cyanobacteria 14,2%, Euglenophyta 2,8% and Dinophyta 2,8% are also recorded, respectively. Species belonging to Cymbella, Gomphonema, Nitzschia, Oscillatoria, Phormidium and Euglema species were determined as pollution indicators.
** Bu çalışma Prof. Dr. Tahir ATICI danışmanlığında yürütülen Oktay GÖKTAŞ'ın Gazi Üniversitesi E... more ** Bu çalışma Prof. Dr. Tahir ATICI danışmanlığında yürütülen Oktay GÖKTAŞ'ın Gazi Üniversitesi Eğitim Bilimleri Enstitüsü Biyoloji Eğitimi Anabilim Dalı doktora tez çalışmasının bir kısmından türetilmiştir.
Variations in the phytoplankton of Zayandeh-Rood Dam Lake were studied seasonally from September ... more Variations in the phytoplankton of Zayandeh-Rood Dam Lake were studied seasonally from September 2005 to August 2006 at 4 different stations. A total of 112 species and 53 genera belonging to 6 divisions were identified. The species belonging to Bacillariophyta, Chlorophyta, Cyanophyta, Euglenophyta, and Dinophyta were found frequently. Chrysophyta species were found in low numbers. Cyclotella meneghinina Kütz., a centric diatom, was the dominant species at all stations. The density of the phytoplankton was between 470 and 150,470 cells/cm 3. According to the Shannon-Weaver Index, the highest and the lowest diversities were determined in November and May, respectively. Regarding physico-chemical analysis and phytoplankton composition, it seems that Zayandeh-Rood Dam Lake is oligomesotrophic, and some species of phytoplankton can be used as indicators for evaluating water quality.
In the present study; nonsilica algae of Seydisuyu Stream Basin were investigated and Cluster Ana... more In the present study; nonsilica algae of Seydisuyu Stream Basin were investigated and Cluster Analysis (CA) was applied to detected biological data in order to classify the stations in terms of algae floras. For this purpose, epipelic (EPP), epilithic (EPL), epifitic (EPF) and planktonic algae samples were collected seasonally from 12 stations in 2012 along the Seydisuyu Stream Basin. According to results of identified nonsilica algae, a total of 17 Chlorophyta species, 12 Cyanobacteria species, 4 Euglenophyta species, 2 Dinoflagellata species and 1 Chrysophyta species were identified from benthic and planktonic samples of investigated freshwater ecosystem. According to results of CA, 5 statistically significant clusters were formed and different ecological zones of the Seydisuyu Stream Basin were presented according to the abundance of algae.
Shell structures provide a compromise between strength and mass, which motivates their use in roc... more Shell structures provide a compromise between strength and mass, which motivates their use in rocket and space hardware (RSH). High and long-term loads cause plastic and creep deformations in structural elements. RSH structures feature inhomogeneity: design inhomogeneity (polythickness, the presence of reinforcements, openings, etc.) and technological inhomogeneity (defects produced in manufacturing, operation, storage. and transportation, defects produced by unforeseen thermomechanical effects, etc.). These factors, which characterize structural inhomogeneity, are stress and strain concentrators and may be responsible for an early failure of structural elements and inadmissible shape imperfections. In inhomogeneous structures, different parts thereof are deformed by a program of their own and exhibit a different stress and strain level. In accounting for a physical nonlinearity, which is governed by plastic and creep deformations, the following approach to the determination of the stress and strain field is efficient: the calculation is divided into stages, and at each stage parameters that characterize the plastic and creep deformations developed are introduced: additional loads in the equilibrium equations or boundary conditions, additional deformations, or variable elasticity parameters (the modulus of elasticity and Poisson's ratio). Successive approximation schemes are constructed: at each stage, an elasticity problem is solved with the introduction of the above parameters. Special consideration is given to the determination of the launch vehicle and launch complex life. This is due to damages caused by alternate high-intensity thermomechanical loads. The basic approach relies on the theory of low-and high-cycle fatigue. The plasticity and the creep of a material are the basic factors in the consideration of the above problems. This paper considers various aspects of the solution of RSH strength and stability problems with account for the effect of plastic and creep deformations.
e-International Journal of Educational Research, Apr 6, 2022
Outdoor learning activities enable individuals to increase their sensitivity, awareness and respo... more Outdoor learning activities enable individuals to increase their sensitivity, awareness and responsibility for nature and the environment. The aim of this study is to determine the opinions of prospective biology teachers about the outdoor learning activities within the scope of nature and environmental education. The study group of the research consists of 78 prospective teachers selected by convenience sampling and registered in the Biology Education Department of a state university. The participants were selected on a voluntary basis. A case study, which is one of the qualitative research methods, was applied in this study. Within the scope of the research, the data were obtained from a semi-structured interview form. In the analysis of the data, the content analysis technique was applied to review and assess the opinions of the prospective biology teachers by using the ATLAS.ti program. The encoder reliability for the study was calculated as (56/62) *100) = 90.3%. According to the results of the study, the prospective biology teachers' opinions about outdoor learning activities towards nature and environmental education were categorized as: the variety of these activities, the importance of these activities in the education system, the contribution of these activities to their professional development, the interesting aspects of these activities, and the difficulties of these activities. As a result of this study, it was determined that field trips and nature walks were mostly included in outdoor learning activities in terms of the variety of nature and environmental education. It was emphasized that these activities caused an increase in sensitivity and awareness towards the environment, enabled the realization of permanent learning, provided the opportunity to learn by doing and to examine living things in nature, and created more fun learning environments in terms of the place and importance of outdoor learning activities in education. It was also stated that these activities contribute to teachers' professional development, as they enable teachers to gain experience in the teaching profession and to gain more knowledge about nature and the environment. Thanks to the outdoor learning activities carried out in accordance with their purpose, a more interesting, effective and permanent learning environment can be realized in an interactive environment. It is recommended that based on the integration of education in different areas of life, departments can carry out outdoor learning activities which are directly related to their fields and prospective teachers can be directed towards the outdoor learning course, which is an elective course in their departments.
Chlorella vulgaris, the expulsion of several compounds with heavy metals, wastewater is used for ... more Chlorella vulgaris, the expulsion of several compounds with heavy metals, wastewater is used for purification. The purpose of this study, the biological treatment capacity of microalgae in the water, and develop, especially with the removal of wastewater ammonium and phosphorus ions to determine whether there is a relationship between the growth-promoting. In photobioreactors was observed removal nitrogen (NO 3-N) and phosphate (PO 4-P) with the help of C.vulgaris for a period of thirty days. Nitrogen and phosphate, both synthetic and natural sewage wastewater, but spent a significant amount of Kl a concentration increased by the amount of synthetic natural sewage wastewater has decreased the starting.
Özet Topçam Baraj Gölü'nün fitoplanktonik alg kompozisyonu ve bazı su kalitesi parametreleri, seç... more Özet Topçam Baraj Gölü'nün fitoplanktonik alg kompozisyonu ve bazı su kalitesi parametreleri, seçilen 3 örnekleme istasyonu temel alınarak incelenmiştir. İstasyonlarda yayılış gösteren fitoplanktonik alg taksonları ve bu taksonların bollukları belirlenmiştir. Baraj gölünde 25 Ochrophyta (Bacillariophyta), 11 Chlorophyta, 9 Cyanophyta, 4 Euglenophyta, 2 Dinophyta ve 2 Chrysophyta şubesi üyesi olmak üzere toplam 53 takson tespit edilmiştir. Microcystis aeruginosa, Scenedesmus acuminatus, Scenedesmus bijugus and Cyclotella distinguenda en bol bulunan taksonlardır. Topçam Baraj Gölü fiziksel ve kimyasal özelliklerden pH ve elektriksel iletkenlik açısında 1 inci sınıf, çözünmüş oksijen açısından 2 inci sınıf su kalitesi özelliğine sahiptir.
The Meriç River is one of the longest rivers of the Balkans and the Tunca River is the most signi... more The Meriç River is one of the longest rivers of the Balkans and the Tunca River is the most significant tributary of the Meriç River. In the present study, the epipelic diatoms of the Meriç and Tunca Rivers were investigated and the water quality was evaluated from a physicochemical and biological perspective. Epipelic (EPP) diatoms were collected from the middlestream of the Meriç River (Edirne Province of Turkey) and from the downstream of the Tunca River (before emptying into the Meriç River) and certain physicochemical parameters including dissolved oxygen (DO), oxygen saturation (OS), pH, electrical conductivity (EC), total dissolved solids (TDS), salinity, turbidity, nitrate (NO 3), nitrite (NO 2), ammonium (NH 4), phosphate (PO 4), sulphate (SO 4), chemical oxygen demand (COD) and oxidation-reduction potential (ORP) were measured during the field studies. The Biological Diatom Index (IBD) was used to determine the trophic status of the Meriç and Tunca Rivers in terms of EPP diatoms, and Cluster Analysis (CA) was applied to the detected biological data in order to classify the identified diatom taxa in terms of their dominance in the system. According to the results of the physicochemical analysis, the Meriç and Tunca Rivers have I.-II. Class water quality in terms of dissolved oxygen, oxygen saturation, pH, EC, TDS, NO 3 , NH 4 , SO 4 and COD parameters; and have III.-IV. Class water quality in terms of NO 2 and PO 4 parameters. 24 diatom species were recorded in the Meriç River by counting a total of 403 valves and a total of 19 diatom species were identified by counting a total of 409 diatom valves in the Tunca River. Cyclotella atomus Hustedt, Navicula gregaria Donkin, Nitzschia palea (Kützing) W.Smith and Nitzschia subacicularis Hustedt, were determined as the most dominant species in the Meriç River and Navicula erifuga Lange-Bertalot, Navicula gregaria Donkin and Navicula rostellata Kützing were recorded as the most dominant taxa in the Tunca River. According to the result of the IBD, the investigated rivers were found to be in a meso-eutrophic state and according to the results of CA, three statistical clusters were formed for both rivers, and were named as "dominant taxa", "frequent taxa" and "rare taxa".
Turkish freshwater and marine macrophyte extracts show in vitro antiprotozoal activity and inhibit FabI, a key enzyme of Plasmodium falciparum fatty acid biosynthesis
Phytomedicine, 2006
The ethanolic extracts of a number of Turkish freshwater macrophytes (Potamogeton perfoliatus, Ra... more The ethanolic extracts of a number of Turkish freshwater macrophytes (Potamogeton perfoliatus, Ranunculus tricophyllus and Cladophora glomerata) and marine macroalgae (Dictyota dichotoma, Halopteris scoparia, Posidonia oceanica, Scinaia furcellata, Sargassum natans and Ulva lactuca) were assayed for their in vitro antiprotozoal activity. Trypanosoma brucei rhodesiense, Trypanosoma cruzi, Leishmania donovani and Plasmodium falciparum were used as test organisms. The cytotoxicity of the extracts was also assessed against primary rat skeletal myoblasts (L6 cells). Whereas none of the extracts were active against T. cruzi, all crude extracts displayed appreciable trypanocidal activity against T. brucei rhodesiense, with S. natans being the most active one (IC(50) 7.4microg/ml). Except for the marine alga H. scoparia, all extracts also possessed leishmanicidal potential. The best antileishmanial activity was exerted by U. lactuca and P. oceanica (IC(50)'s 5.9 and 8.0microg/ml, respectively). Five extracts that demonstrated inhibitory activity towards P. falciparum (IC(50)'s 18.1-48.8microg/ml) were simultaneously assayed against FabI, a crucial enzyme of the fatty acid system of P. falciparum, to find out whether FabI was their target. The extracts of C. glomerata and U. lactuca efficiently inhibited the FabI enzyme with IC(50) values of 1.0 and 4.0microg/ml, respectively. None of the extracts were cytotoxic towards mammalian L6 cells. This work reports for the first time antiprotozoal activity of some Turkish marine and freshwater algae, as well as a target-based antiplasmodial screening for the identification of P. falciparum FabI inhibitors from aquatic and marine macrophytes.
Investigation of the Relationship Between Emergent Macrophytes and Physicochemical Parameters in Rivers
Turkish Journal of Water Science and Management
The purpose of this study is to investigate the relationship between emergent macrophyte species ... more The purpose of this study is to investigate the relationship between emergent macrophyte species in rivers representing various water body types in Türkiye and general chemical parameters collected in line with the Water Framework Directive. The relationship between aquatic macrophytes and abiotic variables in rivers was investigated using Canonical Correspondence Analysis. In addition, the ortho-phosphate parameter, which effects the distribution and abundance of river macrophytes, was included in the analysis along with other river parameters. According to the findings of the study that covered certain rivers in our country's western region, all phosphorus and nitrogen compounds included in the study were effective in the distribution of emergent aquatic plants. Among these parameters, nitrate, organic nitrogen, total phosphorus, and ortho-phosphate distinguished in terms of aquatic plant distribution.
Communications Faculty of Science University of Ankara Series C Biology Geological Engineering and Geophysical Engineering
The water quality parameters of Çubuk Stream were examined in terms of physical and chemical aspe... more The water quality parameters of Çubuk Stream were examined in terms of physical and chemical aspects and the pollution level of Çubuk Stream was determined by comparing these parameters with the Surface Water Quality Regulation (SWQR). For this purpose; samples were taken from three different stations between August 2012 and April 2013, the water samples were compared with each other and with previous studies, the water quality of Çubuk Stream was determined according to the surface water quality regulation. In our study, the biological oxygen requirement of Çubuk Stream according to SWQR (BOD5: 22.5mg/l) IV. class, ammonium nitrogen element (NH4–N:2.34 mg/l) IV. class, nitrite nitrogen element (NO2–N: 0.035 mg/l) II. class, nitrate nitrogen element (NO3 –N:0.95 mg/l) Class I, according to phosphate value (PO4:0.075 mg/l) Class I and trace elements (Pb, Cd, Cr, Ni, Mn) values Class I. water quality. According to the ratio of NH4-N/PO4 (2.34/0.075=31.2 mg/l), the element that limits ...
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