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21. apríl 2017 - 9:16
Föstudaginn 21. apríl mun dr. Ásta Heiðrún E. Pétursdóttir hjá Matís vera með kynningu sem ber heitið:
"Distribution of arsenic containing lipids and arsenosugars throughout the brown macroalgae"
Tími: 12:30-13:10 the 21. april 2017
Staðsetning: stofa157 í VR-II
Seaweed has naturally high concentrations of total arsenic compared to agricultural produce. Arsenic accumulates in seaweed because of the structural similarities of arsenate and phosphate, where phosphate transporters can mistake arsenate for phosphate due to lack of specificity. However, arsenic is not found in the form of toxic arsenate in seaweed but mainly as arsenosugars. Seaweed has also been shown to contain a significant proportion of arsenic in the form of arsenolipids (AsLp), i.e. arsenohydrocarbons (AsHC), arseno fatty acids (AsFA) and arsenosugarphospholipids (AsPL). Arsenic is often grouped as either inorganic arsenic (iAs: arsenate & arsenite) or organic arsenic, where iAs is a class I carcinogen but the organic arsenic has been considered less toxic. However, a recent study has shown that certain arsenolipids can be as cytotoxic as the iAs.
Here we look at Saccharina latissma and Alaria Esculenta collected in Iceland. The collected algae was partitioned into different sections (holdfast, stipe, sporangium, young frond, old frond) to investigate the AsLp and arsenosugar profile based on different age of the seaweed.