Sürdürülebilir Kalkınma Amaçları
Yayınlar
- MakaleAçık Erişim2019Scopus SJRQ3Study of the bioaccumulation of UO2 2+ onto the green microalgae botryococcus braunii using response surface methodology
Celik, Fatih; Aslani, Mahmoud Ali Asker; Can, Safak Seyhaneyildiz
The bioaccumulation of UO2 2+ (uranyl ion) was investigated by using dry biomass of Botryococcus braunii. Experiments were conducted based on a rotatable central composite design (CCD) and analyzed using response surface methodology (RSM), which was used to optimize the bioaccumulation process. In this goal, the effects of parameters such as initial uranium (VI) concentration, pH, temperature and contact time were studied. The optimum conditions for maximum removal (87%) of UO2 2+ from an aqueous solution were as follows: initial uranium (VI) concentration (55 mg/l), pH (3.6), temperature (46°C) and contact time (74 min). Langmuir and Freundlich isotherms and also thermodynamic parameters like Enthalpy (∆H°), Entropy (∆S°), standard Gibbs free energy (∆G°) were investigated, as well.
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İncele - Derleme MakaleYalnız künye2017Akuakültürde sürdürülebilir besin kaynağı olarak mikroalglerin kullanım
Özçiçek, Esin; Can, Safak Seyhaneyildiz; Can, Erkan; Yılmaz, Kadir
Güvenilirliği daha fazla olan besin kaynaklarına duyulan ihtiyaç, hayvansal ürünlere göre özellikle bitki ve alglere olan ilgiyi arttırmıştır. Akuakültürde çeşitli kullanım alanları olan mikroalglerden önemli ölçüde faydalanılmaktadır. Besin olarak kullanılmalarının yanı sıra salmonlarda pigment kaynağı olarak da değerlendirilmektedir. Günümüzde büyük ölçekli ve gelişmiş kalite kontrolü ile elde edilebilen mikroalg üretim sistemlerinin maliyet etkinliğini incelemek için çalışmalar devam etmektedir. Mikroalglerin kullanımında sürdürülebilirliği sağlamak için; biyoteknoloji, biyoişleme ve yönetim prosedürleri gibi farklı alanların entegre olduğu sistemlere dayalı bir yaklaşım gerekmektedir
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İncele - Derleme MakaleAçık Erişim2017Usage of microalgae as a sustainable food source in aquaculture
Özçiçek, Esin; Cane, Erkan; Yilmaz, Kadir; Can, Safak Seyhaneyildiz
The need for food sources more reliability according to animal products has increased interest especially in plants and in algae. In aquaculture has benefited significantly from microalgae in the various application areas. They are used as food as well as are evaluated as sources of pigments in the salmonids. Currently, studies are underway to examine the cost-effectiveness of microalgae production systems which can be obtained by large-scale and advanced quality control. In order to ensure sustainability in the use of microalgae; a systems based approach is needed which integrates different fields such as biotechnology, bioprocess and management procedures.
AtıfWoS4OpenAlex1İncele - MakaleYalnız künye2016Scopus SJRQ3EFFECTS OF SALINITY, LIGHT AND NITROGEN CONCENTRATION ON GROWTH AND LIPID ACCUMULATION OF THE GREEN ALGAE DUNALIELLA BARDAWIL
Can, Safak Seyhaneyildiz; Cirik, Semra; Koru, Edis; Turan, Gamze; Tekogul, Hatice; Subakan, Tugba
Efficient biofuel production from algae depends on the microalgal biomass production rate and lipid content. Both biomass production and lipid accumulation are limited by several factors, of which nutrients play a key role. In this study, the marine microalgae Dunaliella bardawil was used as a model organism. D. bardawil was cultured at two different sodium nitrate concentrations as 0 and 0.7 M, at six different amounts of salinity as 0.65, 1.0, 1.5, 2.0, 2.75 and 3.5 M, and at two different light intensity levels as 65 and 800 mu mol foton m(-2) s(-1) The study was done under pH 7. After 15-day growth period, the most efficient culture of D. bardawil for both biomass increase and lipid production was determined for the samples with 39.67 +/- 4.51 lipid rates cultured under 0.7 M nitrate concentration, 2.75 M salinity and 800 mu mol photon m(-2) sn(-1) light intensity. This high level of lipid production is sufficient to use D. bardawil for biodiesel production. Also after the evaluation of fatty acid results of GC-FID analysis, it was determined that D. bardawil contains high rate of medium length (C16-C18) fatty acid chains suitable for the production of biodiesel. These results are satisfactory to use D. bardawil in biodiesel production.
AtıfWoS2İncele - MakaleYalnız künye2015Scopus SJRQ3EVALUATING THE DILUTION OF MUNICIPAL WASTEWATER ON BIOMASS INCREASE, LIPID PRODUCTION AND NUTRIENT REMOVAL BY THE BLUE-GREEN ALGAE Spirulina platensis (Geitler)
Can, Safak Seyhaneyildiz; Demir, Veysel; Can, Erkan
Wastewater generated daily in urban localities could provide nourishment to algae for potential production of biofuel and biochemicals. This study presents an integrated approach to the use of Spirulina platensis cultures for the treatment of domestic wastewater and lipid extraction. In this experimental approach, wastewater subjected only to the primary settling process was used as nutrient media at different concentrations of 100%, 75%, 50%, and 25% wastewater diluted with distilled water, and Spirulina platensis was cultured in these mediums for 20 days. The inoculated medium was incubated at 30 degrees C in the presence of light (42 mu mol photon m(-2).s(-1)) by using light/dark cycle of 12 hours. S. platensis consumed nitrite, nitrate, phosphate and ammonium from wastewater, and it increased its biomass and its lipid amount. Although the highest biomass increase was observed at the wastewater medium without dilution (100% wastewater) (the control group was not included), the highest lipid production was found in 25% wastewater. On the other hand, the percent reduction in the level of nitrite, nitrate, phosphate and ammonium in 75% wastewater medium was 91%, 99%, 99% and 99%, respectively. Despite the low lipid content, since Spirulina platensis can live in harsh conditions and increase its biomass rapidly, they can be easily cultivated in wastewater. Therefore, their use in wastewater for biodiesel production was found appropriate. The resulting algae biomass after oil extraction can be also used in different industrial sectors.
AtıfWoS5İncele - MakaleAçık Erişim2015Scopus SJRQ2Influence of Alpha and Gamma-Iron Oxide Nanoparticles on Marine Microalgae Species
Demir, Veysel; Ates, Mehmet; Arslan, Zikri; Camas, Mustafa; Celik, Fatih; Bogatu, Corneliu; Can, Safak Seyhaneyildiz
The effects of alpha-iron oxide (alpha-Fe2O3) and gamma-iron oxide (gamma-Fe2O3) nanoparticles (NPs) on marine microalgae species (Nannochloropsis sp. and Isochrysis sp.) were investigated in this study. Both Fe2O3 NPs covered the surface of algae with the agglomerates of the nanoparticles. This form of physical NP toxicity significantly decreased the sizes of phytoplankton. Both NPs were toxic to the tested algal species, while alpha-Fe2O3 showed less toxicity than gamma-Fe2O3 NPs for both algal species. A comparative analysis of growth data of the two algal species treated with alpha-Fe2O3 or gamma-Fe2O3 NPs revealed that Isochrysis sp. are more sensitive than Nannochloropsis sp. Toxicity of these widely used NPs to primary producers forming the base of the food chain in aquatic environments might result in widespread adverse effects on aquatic environmental health.
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İncele - MakaleYayıncıda açık erişim2014Scopus SJRQ3Temporal Changes in Concentrations of Some Trace Elements in Muscle Tissue of Crayfish, Astacus leptodactylus (Eschscholtz, 1823), from Keban Dam Lake
Aksu, Onder; Adiguzel, Ragip; Demir, Veysel; Yildirim, Numan; Danabas, Durali; Seker, Sebahat; Can, Safak Seyhaneyildiz; Ates, Mustafa
Crayfish (Astacus leptodactylus Eschscholtz, 1823) is the native crayfish species in Turkey. It was exported regularly to Western Europe. In this study, bioaccumulation and temporal trends of some trace elements (arsenic: As, cadmium: Cd, copper: Cu, mercury: Hg, lead: Pb, and zinc: Zn) in edible abdomenmuscle of crayfish from Keban Dam Lake (Elazig, Turkey) were investigated for the 2006-2012 period. Sequence of metal concentration levels was Zn > Cu > Hg > Pb > Cd > As in muscle tissues. The highest concentration of Zn (21.69mg kg(-1)) was detected in 2006, while the lowest (4.35mg kg(-1)) in 2009. In general, it was found that the concentrations of trace elements investigated were lower than the maximum permissible limits of the food regulations of the Ministry of Food, Agriculture, and Livestock (MFAL), the Turkish Food Codex and Commission Regulation (EC). If the crayfish selected for the study are recognized as bioindicators of environmental pollution, then it is possible to conclude that the changes in studied trace elements concentrations in the Keban Dam Lake are being steady.
AtıfWoS5OpenAlex8İncele - MakaleAçık Erişim2014Scopus SJRQ3EFFECT OF DIETARY KEFIR ON THE DIGESTIVE AND LIVER ENZYMES ACTIVITIES AND GLUCOSE LEVEL OF CORUH TROUT, SALMO CORUHENSIS (ACTINOPTERYGII: SALMONIFORMES: SALMONIDAE)
Can, Safak Seyhaneyildiz; Kutluyer, Filiz; Can, Erkan; Kayis, Sevki; Sonay, Fatma Delihasan; Köse, Ozay; Aksu, Onder; Erdamar, Husamettin; Yigitoglu, M. Ramazan; Kayim, Murathan
The probiotics are very important for aquaculture because of their role in enhancing the fish health status, improving disease resistance, growth performance, and body composition, reducing malformations, improving gut morphology and the overall microbial balance. The objective of the presently reported study was to investigate effects of kefir as a probiotic product on the digestive and hepatic enzyme activities, as well as glucose level of Coruh trout, Salmo coruhensis Turan, Kottelat et Engin, 2010. The experiment was performed with four treatments: control group (no kefir), D1, D2, and D3 (kefir-supplemented diet: 10, 20, and 40 g . kg(-1) fish body mass, respectively). The activity of: alanine aminotransferase (ALT), aspartate aminotranferase (AST), lactate dehydrogenase (LDH), lipase, amylase-as well as the glucose levels were determined after 4 months. The results indicated that glucose levels (P < 0.05) and digestive enzymes (lipase and amylase) in the blood serum decreased in fish fed diets containing kefir (P > 0.05). On the contrary, the activity of liver enzymes (ALT, AST, and LDH) increased insignificantly (P > 0.05). In conclusion, digestive and liver enzyme activities were affected by quantitative changes in dietary kefir insignificantly but further research is needed to establish whether the liver and digestive enzyme physiology of Coruh trout can be affected by kefir-supplemented diets in a long-term trial.
AtıfWoS6OpenAlex12İncele - MakaleYalnız künye2012Scopus SJRQ3COMPARISON OF HEAVY METALS BIOACCUMULATION BY DREISSENA POLYMORPHA (PALLAS, 1771) AND UNIO ELONGATULUS EUCIRRUS (BOURGUIGNAT, 1860) FROM KEBAN DAM LAKE, TURKEY
Aksu, Onder; Yabanli, Murat; Can, Erkan; Kutluyer, Filiz; Kehayias, George; Can, Safak Seyhaneyildiz; Kocabas, Mehmet; Demir, Veysel
The present study aimed to determine and compare the bioaccumulation of heavy metals in two freshwater species of mussels Unio elongatulus eucirrus (Bourguignat, 1860) and Dreissena polymorpha (Pallas, 1771) in Keban Dam Lake, Turkey. The amount of Arsenic (As), Cadmium (Cd), Copper (Cu), Lead (Pb) and Uranium (U) were detected. Heavy metals concentrations (ppm) of these heavy metals in U. e. eucirrus and D. polymorpha were 1.071 and 1.376 for As, 0.174 and 0.335 for Cd, 0.004 and 3.817 for Cu, 0 and 0.267 for Pb, 0.004 and 0.267 for U, respectively. Arsenic concentrations in the tissues of both species have exceeded the maximum permission limits in all sampling sites. The concentrations of Cu and U were considerably greater in D. polymorpha specimens than in U. e. eucirrus (p<0.05). The results obtained from the present study showed that both species accumulated heavy metals generally in the following sequences: Cu > As > Cd > Pb >U. The present results indicated that D. polymorpha may be a better bioindicator of environmental pollution than U. e. eucirrus, since it showed a higher accumulation capacity.
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