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Screening yeast cells for absorption of selenium oxyanions
Authors:Soudi  Mohammad Reza  Malekzadeh   Fereydoon  Norouzi   Parviz
Affiliation:(1) Department of Microbiology, Faculty of Science, Tehran University, Tehran, Iran;(2) Department of Chemistry, Faculty of Science, Tehran University, Tehran, Iran
Abstract:Certain yeast cells on solid nutrient medium produced colonies surrounded by a light zone of selenite absorption. This screening procedure resulted in the selection of 22 strains out of 200 isolates with different Se4+-absorbing capacity ranging from 16 to 98.8 mgrg Se4+ g–1 l–1 h–1. The highest rate of Se4+ elimination from the Na2SeO3 solution was observed with an oval shaped, cream pigmented fermentative yeast, tentatively called Candida sp. strain MS4. This strain was isolated from wastewater and found to accumulate selenium oxyanions. Se4+ uptake involved both inactive and active phenomena. The amounts of selenium (initial concentration 2 mg Se4+ l–1) removed from aqueous solution by inactive and active phenomena were 667 mgrg Se4+ g–1 l–1, and 1580 mgrg Se4+ g–1 l–1, respectively. The strain also removed selenate inactively (135 mgrg Se6+ g–1 l–1).
Keywords:Absorption  Candida sp.  screening method  selenite reduction  selenium oxyanions
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