The Experts below are selected from a list of 318 Experts worldwide ranked by ideXlab platform

Frank B. Whitfield - One of the best experts on this subject based on the ideXlab platform.

  • Seasonal variation in bromophenol content andbromoperoxidase activity in Ulva lactuca
    Phytochemistry, 1999
    Co-Authors: Carina Flodin, Fay Helidoniotis, Frank B. Whitfield
    Abstract:

    Seasonal variation in bromophenol content and bromoperoxidase activity in the greenmarine alga, Ulva lactuca, was studied. Bromophenols were extracted from the alga bysimultaneous steam distillation-solvent extraction, followed by identification and quantificationby gas chromatography–mass spectrometry. A method for the extraction of bromoperoxidasesfrom the alga was developed, which includes homogenisation in Milli-Q water and addition ofglycerol. The results obtained show that both bromophenol content and bromoperoxidase activityexhibit extreme seasonal variation, with high values in summer and low ones in winter.

Mohamed Blaghen - One of the best experts on this subject based on the ideXlab platform.

  • Biosorption of mercury from aqueous solution by Ulva lactuca biomass.
    Bioresource technology, 2003
    Co-Authors: Youssef Zeroual, Adnane Moutaouakkil, F. Z. Dzairi, M. Talbi, Park Ung Chung, Kang-min Lee, Mohamed Blaghen
    Abstract:

    The mercury biosorption onto non-living protonated biomass of Ulva lactuca, as an alternative method for mercury removal from aqueous solutions, was investigated. Batch equilibrium tests showed that at pH 3.5, 5.5 and 7 the maxima of mercury uptake values, according to Langmuir adsorption isotherm, were 27.24, 84.74 and 149.25 mg/g, respectively. The ability of Ulva lactuca biomass to adsorb mercury in fixed-bed column, was investigated as well. The influence of column bed height, flow rate and effluent initial concentration of metal was studied. The adsorbed metal ions were easily desorbed from the algal biomass with 0.3 N H2SO4 solution. After acid desorption and regeneration with distilled water, the biomass could be reused for other biosorption assays with similar performances.

Carina Flodin - One of the best experts on this subject based on the ideXlab platform.

  • Seasonal variation in bromophenol content andbromoperoxidase activity in Ulva lactuca
    Phytochemistry, 1999
    Co-Authors: Carina Flodin, Fay Helidoniotis, Frank B. Whitfield
    Abstract:

    Seasonal variation in bromophenol content and bromoperoxidase activity in the greenmarine alga, Ulva lactuca, was studied. Bromophenols were extracted from the alga bysimultaneous steam distillation-solvent extraction, followed by identification and quantificationby gas chromatography–mass spectrometry. A method for the extraction of bromoperoxidasesfrom the alga was developed, which includes homogenisation in Milli-Q water and addition ofglycerol. The results obtained show that both bromophenol content and bromoperoxidase activityexhibit extreme seasonal variation, with high values in summer and low ones in winter.

Youssef Zeroual - One of the best experts on this subject based on the ideXlab platform.

  • Biosorption of mercury from aqueous solution by Ulva lactuca biomass.
    Bioresource technology, 2003
    Co-Authors: Youssef Zeroual, Adnane Moutaouakkil, F. Z. Dzairi, M. Talbi, Park Ung Chung, Kang-min Lee, Mohamed Blaghen
    Abstract:

    The mercury biosorption onto non-living protonated biomass of Ulva lactuca, as an alternative method for mercury removal from aqueous solutions, was investigated. Batch equilibrium tests showed that at pH 3.5, 5.5 and 7 the maxima of mercury uptake values, according to Langmuir adsorption isotherm, were 27.24, 84.74 and 149.25 mg/g, respectively. The ability of Ulva lactuca biomass to adsorb mercury in fixed-bed column, was investigated as well. The influence of column bed height, flow rate and effluent initial concentration of metal was studied. The adsorbed metal ions were easily desorbed from the algal biomass with 0.3 N H2SO4 solution. After acid desorption and regeneration with distilled water, the biomass could be reused for other biosorption assays with similar performances.

Andrea Helmstetter - One of the best experts on this subject based on the ideXlab platform.

  • Use of Ulva lactuca to distinguish pH-dependent toxicants in marine waters and sediments
    Environmental Toxicology and Chemistry, 1999
    Co-Authors: Anne Kuhn, Marguerite C. Pelletier, Robert M. Burgess, Andrea Helmstetter
    Abstract:

    Ulva lactuca (sea lettuce) is a cosmopolitan marine attached green seaweed capable of sequestering high environmental levels of ammonia. Ammonia can be acutely toxic to marine organisms and is often found in dredged sediments from highly industrial areas or from areas with high carbon inputs. For the purposes of dredged sediment disposal as well as in determining causes of toxicity in complex mixtures, it is important to distinguish ammonia toxicity from the toxicity of other compounds. The use of U. lactuca to selectively remove ammonia from waters and sediments as part of a toxicity identification and evaluation (TIE) procedure was evaluated. Ulva lactuca lowered concentrations of total ammonia from 75 to 17 mg/L in