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    BIOACCUMULATION OF COPPER, CADMIUM AND NICKEL IN DUCKWEED (Lemna trisulca)
    (Parlar Scientific Publications (P S P), 2015) Kara, Yesim; Akba, Osman
    Duckweeds are small free-floating plants often farming dense mats on the surface of stillor slow flowing water. Lemna trisulca (Duckweed) was examined for its ability to remove heavy metals. In laboratory conditions, plants were exposed to the copper, cadmium and nickel concentrations of 1.0, 3.0, 5.0 and 7.0 mg L-1 in certain periods (24, 48, 72 and 96 hours). The accumulation levels of metals in plants depending on different time and concentrations were investigated by using atomic absorption spectrometer. The results on bioaccumulation rates of Ni, Cd and Cu ions in Duckweed showed that the plant was able to remove the heavy metals. The maximum BCF values obtained were 541 for Cd, 848 for Cu and 1867 for Ni. Among the metals used, Ni was found to be accumulated at higher levels depending on the metal concentrations and time periods.
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    THE IMPACTS OF DIFFERENT AUXINS ON PHENOLIC CONTENTS AND THE TOTAL ANTIOXIDANT CAPACITY OF HYPERICUM RETUSUM AUCHER
    (Parlar Scientific Publications (P S P), 2018) Namli, Sureyya; Kara, Yesim; Isikalan, Cigdem; Akbas, Filiz; Vaizogullar, Hayser Ertem
    The study was aimed to evaluate the effects of different auxins on phenolic contents and antioxidant potential of methanolic extract of Hypericum retusum Aucher (Clusiaceae) plantlets grown under in vitro conditions. After seed sterilisation and germination, shoot proliferations were performed. In this study, shoots were separately cultured in the medium containing BAP (0.5 mgl(-1)) combined with three different auxins (0.25 mgl(-1) IAA, NAA, IBA) and the highest number of shoots was obtained on medium supplemented with 0.5 mgl(-1) BAP. The highest total antioxidant capacity and phenolic contents were observed auxins. The methanol extracts of plantlets grown in vitro conditions showed the strongest free radical scavenging capacities at concentrations of 100 and 150 mu g/ml. It has been found that auxins and in vitro growth conditions have a significant effect on the total antioxidant capacity and phenolic contents.