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2013•Journal of University of South ChinaRequires access

Comparative Study of Fluoride-tolerance of Five Typical Bioleaching Microorganisms

Xueduan Liu

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Abstract

In microbial leaching systems,the microbial tolerance cannot generally bear the environmental stress.Fluoride to a large extent could inhibit the growth and activity of the microbes,or even kill the microbes.The growth state and iron/sulfur oxidation activities of five representive bioleaching microorganisms(A.ferrooxidans ATCC 23270,L.ferriphilum YSK,S.thermosulfidooxidans ST,A.thiooxidans A01,A.caldus S1) upon different fluoride stress were compared.It showed that the fluoride tolerance of A.ferrooxidans was the best,A.thiooxidans was the second,L.ferriphilum and A.caldus was the third,S.thermosulfidooxidans was the worst.Additionally,moderate thermophiles were inhibited more than mesophiles.

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What this paper is about

In microbial leaching systems,the microbial tolerance cannot generally bear the environmental stress.Fluoride to a large extent could inhibit the growth and activity of the microbes,or even kill the microbes.The growth state and iron/sulfur oxidation activities of five representive bioleaching microorganisms(A.ferrooxidans ATCC 23270,L.ferriphilum YSK,S.thermosulfidooxidans ST,A.thiooxidans A01,A.caldus S1) upon different fluoride stress were compared.It showed that the fluoride tolerance of A.ferrooxidans was the best,A.thiooxidans was the second,L.ferriphilum and A.caldus was the third,S.thermosulfidooxidans was the worst.Additionally,moderate thermophiles were inhibited more than mesophiles.

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Available abstract

In microbial leaching systems,the microbial tolerance cannot generally bear the environmental stress.Fluoride to a large extent could inhibit the growth and activity of the microbes,or even kill the microbes.The growth state and iron/sulfur oxidation activities of five representive bioleaching microorganisms(A.ferrooxidans ATCC 23270,L.ferriphilum YSK,S.thermosulfidooxidans ST,A.thiooxidans A01,A.caldus S1) upon different fluoride stress were compared.It showed that the fluoride tolerance of A.ferrooxidans was the best,A.thiooxidans was the second,L.ferriphilum and A.caldus was the third,S.thermosulfidooxidans was the worst.Additionally,moderate thermophiles were inhibited more than mesophiles.

Key concepts: Bioleaching, Thermophile, Mesophile, Fluoride, Microorganism, Leaching (pedology), Sulfur, Chemistry

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