Metal accumulation by fungi: Applications in environmental biotechnology

Tobin, John M.; White, C; Gadd, Geoffrey M.

doi:10.1007/bf01584110

Cited by 131 publications

(67 citation statements)

References 25 publications

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“…The intake and subsequent efflux of heavy metal ions in microorganisms usually include a redox reaction involving the metal, which some organisms can even use for energy and growth. This has an important implication on microbial tolerance to heavy metals because the solubility and toxicity of the metal depend on its oxidation state (14,17,28,29).…”

Section: Discussionmentioning

confidence: 99%

Copper influence on polyphosphate metabolism of Cunninghamella elegans

Souza¹,

Marinho²,

Lima³

et al. 2005

Braz. J. Microbiol.

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The aim of this work was to evaluate the physiological aspects of polyphosphate metabolism of Cunninghamella elegans grown in presence of copper. The growth profile was obtained by means of biomass yields, orthophosphate consumption, polyphosphate accumulation and phosphatases activities. The results revealed the influence of copper on the growth, observed by biomass yields. Orthophosphate consumption was faster in cells grown in the presence of copper. The presence of copper in the culture medium induced polyphosphate accumulation. The polyphosphate level was almost constant in the beginning of control culture growth, and could be related to the exponential growth phase. On the other hand, the copper treated cultures exhibited a significant reduction in the polyphosphate levels, indicating an active metabolization of the polymer. Acid phosphatase activity was not detected in the conditions studied, but alkaline phosphatase activity was significantly lower in the treated cultures. The results suggest the potential use of Cunninghamella elegans isolate in bioremediation and biosorption applied to environments polluted by copper.

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Section: Discussionmentioning

confidence: 99%

Copper influence on polyphosphate metabolism of Cunninghamella elegans

Souza¹,

Marinho²,

Lima³

et al. 2005

Braz. J. Microbiol.

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“…Thus, Ni R II was better Ni-accumulator than Ni R I. Very low content of Ni in the mutant biomass in later phases of growth can be attributed to the changes in the biosorptive properties of the fungus due to the chemical changes in the mycelium 7 .…”

Section: Characterization Of Ni R Mutantsmentioning

confidence: 98%

“…Increase of heavy metals in the environment leads to the selection of resistant organisms via molecular mechanisms 5,6 . Metal resistant microbes have a repertoire of mechanisms by which they can accumulate heavy metals and radionuclides from industrial effl uents, contaminated sewage, sludge, coal wastes, low grade ores and urban waste; and thereby prove benefi cial both in environmental decontamination as well as recovery of valuable metals 7,8 . To exploit the microorganisms for such benefi ts, it is essential to have microorganisms possessing high resistance against the metal.…”

Section: Introductionmentioning

confidence: 99%

Development and characterization of nickel accumulating mutants of Aspergillus nidulans

Tripathi

Srivastava

2007

Indian J Microbiol

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Stable mutants of Aspergillus nidulans, resistant to 1 mM Ni were developed by step-by-step repeated culturing of the fungus on the medium containing increasing concentrations of nickel chloride. Characterization of mutants could differentiate them into two categories Ni R I and Ni R II. Each category of mutants exhibited alterations in growth, conidial germination and melanin secretion both in Ni-free and Ni-containing media. Ni R II mutants were little slow in growth with sparse mycelia and conidiation but showed high melanin secretion and higher Ni-uptake in comparison to Ni R I mutant. Studies involving metabolic and translational inhibitors could prove that Niaccumulation was biphasic. The initial energy independent surface accumulation was found to be followed by energy dependent intarcellular uptake. Increase in the concentration of the metal in the medium or the time of exposure did not proportionately increase the metal uptake by the mutants. Ni -uptake followed Michaelis-Menton saturation kinetics, which was enhanced under optimum pH of 6.5-7.5 and reduced complexity of the medium due to free availability of ions. Resistance to Ni was found to be constitutive in Ni R I mutant, and could be induced in Ni R II mutant.

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“…and Aspergillus sp. From this limited analysis, biosorption by fungal cells appears to be species specific, depending on the components of the fungal cell walls that provide binding sites for elements [22]. The results of Cs and Sr extraction using the mixed cation solution from single fungal cultures are illustrated in Fig.…”

Section: B Effects Of Single Fungal Culturementioning

confidence: 99%

The Influence of Soil Fungi on the Sorption of Cesium and Strontium in the Soil Organic Layer

Seeprasert¹,

Yoneda²,

Shimada³

2016

IJESD

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Abstract-Large quantities of cesium (Cs) and strontium (Sr) released from the Fukushima accident in 2011 are still present in terrestrial ecosystems. This study addressed the contribution of microbial activity to the sorption of Cs and Sr into organic material, which is necessary for comparing non-sterile systems with sterile systems. The aim was to determine the contribution of microbial activity to the sorption of Cs and Sr in organic material. The complete potential of fungi to cycle Cs and Sr in the organic soil system was assessed in a series of experiments. Organic material was prepared under laboratory conditions from leaf litter to minimize the interference from competition by clay minerals. The results of an experimental system comparing biotic and abiotic systems conclusively demonstrate that soil fungi play an important role in the sorption and retention of Cs and Sr. In all experiments, the retention of both elements was greater in biotic systems than in abiotic systems. Soil and saprotrophic fungi make an important contribution to the sorption of Cs and Sr in organic systems and may partly account for the strong, irreversible binding observed in biotic systems. The single strains of Fusarium sp., Trichoderma sp., and Aspergillus sp. showed increased amounts of Cs and Sr in a fixed form compared with those found in a biotic system. This finding may partly account for the high level of retention of Cs and Sr in upland organic soil, which is not satisfactorily accounted by the physicochemical process alone. It may also partly account for the strong, irreversible binding observed in biotic systems.

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Metal accumulation by fungi: Applications in environmental biotechnology

Cited by 131 publications

References 25 publications

Copper influence on polyphosphate metabolism of Cunninghamella elegans

Copper influence on polyphosphate metabolism of Cunninghamella elegans

Development and characterization of nickel accumulating mutants of Aspergillus nidulans

The Influence of Soil Fungi on the Sorption of Cesium and Strontium in the Soil Organic Layer

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