Browsing by Subject "Scenedesmus"

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    Phytotoxicity of water and sediment from Nif Brook (Izmir, Turkey) on green algae desmodesmus (=Scenedesmus) subspicatus; [Nif Çayı (İzmir, Türkiye) su ve sedimenti'nin yeşil alg desmodesmus (=Scenedesmus) subspicatus üzerine fitotoksisitesi]
    (Cevkor Vakfi, 2012) Katalay S.; Boyacioglu M.; Cakal Arslan O.; Parlak H.; Ali Karaaslan M.
    The water of Nif Brook (Izmir, Turkey) is polluted by industrial, domestic, and agricultural sources. As the water of the brook is used for domestic and industrial water supply as well as for irrigation, it is of great importance to know the toxicity potential for the natural populations. For this purpose the standard test protocol for the short term phytotoxicity test method OECD 201 Algal Growth Inhibition has been evaluated with cultures of green algae Desmodesmus (=Scenedesmus) subspicatus as the representative of the first trophic level. The test has been used to assess the toxicity of both water and sediment samples from the brook. Five sampling sites from the brook were selected considering the type of pollution sources. The water samples were tested with 10, 20, 40, 60, 80 and 100 % dilutions in a test medium. Extracts of sediment samples were assayed in three different concentrations (20, 40 and 100 mg/mL). The effects on the growth of D. subspicatus were evaluated by scoring cell numbers under the light microscope with a Neubauer haemocytometer counting chamber. According to the results, the water samples stimulated the algal growth (except station 1); although all sediment samples inhibited the growth of populations, in several grades.
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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.