Environmental Engineering / Çevre Mühendisliği
Permanent URI for this collectionhttps://hdl.handle.net/11147/4321
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Article Cyanobacterial Communities in Mucilage Collected From Çanakkale Strait (dardanelles): Metagenomic Approach(Çanakkale Onsekiz Mart Üniversitesi, 2022) Yılmaz, Sevdan; Kahraman Yılmaz, Dilek; Çelik, Ekrem Şanver; Küçüker, Mehmet AliIn this study, cyanobacterial communities in mucilage samples collected from three stations in the Dardanelles Strait were analyzed with a metagenomic approach. Mucilage samples were collected at the beginning of June 2021 from three points of the Dardanelles (Station 1: 40°6'42.78"N, 26°23'57.00"E; Station 2: 40°9'8.09"N, 26°24'16.19"E; Station 3: 40°6 '21.62"N, 26°22'41.25"E). The dominant cyanobacteria were Prochlorococcus marinus (39.17%), Synechococcus sp. (20.85%), Lyngbya sp. (12.00%), Trichodesmium erythraeum (7.33%), Aphanocapsa sp. (4.33%) and Leptolyngbya sp. (3.33%), which constituted 87.00 % of the total number of sequences. In this study, cyanobacteria species that can cause harmful algal blooms and have toxic effects on the mucilage structure have been determined. The Marmara Sea and the Dardanelles Strait, which have been affected by serious disturbances, including industrial activities, anthropogenic impacts, tourism and artificial lighting, will never be fully restored to their former ecological state. In addition, cyanobacteria species in the mucilage may cause harmful algal blooms and have toxic effects that threaten the future well-being of coastal populations and ecosystem stability. Thus, the government and local authorities should pay more attention to combating the mucilage.Article Characterization of Asbestos in Ambient Air During Refractory Material Production From Magnesite Ore(Çanakkale Onsekiz Mart Üniversitesi, 2021) Küçüker, Mehmet AliAsbestos is a general term employed for crystallized silicate minerals in fibril form. It can be commonly found in nature and from which fibre uses in the industry through processing are obtained. It is dielectric and fibrous, having an elastic feature. However, there is limited information about the air quality in terms of asbestos for the companies that produce refractory materials from magnesite ore. This deficiency in the literature can be eliminated with this study for a company with high quality and durable refractory materials. Among the most commonly used asbestos analysis are scanning electron microscope (SEM), transmission electron microscope (TEM). Asbestos analyses have been performed in two different institutions on the parallel samples whose preliminary processes have been completed. According to the results of the examinations conducted by SEM, 23 of the fibrils observed in a total area are bigger than five µmin lengths and less than 3 µm in width. Three of these fibrils were observed to have the characteristics of chrysotile fibres morphemically and elementally. In addition, airborne samples were analyzed using a TEM instrument. According to the results obtained, 13 of the fibrils observed in total were bigger than 5 µm in length and less than 3 µm in width and based on ED analysis and elemental composition (EDXA) results of these fibrils, and they were not observed to have the characteristics of chrysotile fibres. The majority of the fibrils observed were noted to be other inorganic minerals (lizardite) fibrils. Additionally, the obtained results show that the asbestos concentration in the air is below the limit specified by the provision (0,1 fiber/cm3).