Studies on the leaching behaviour of heterotrophic microorganisms isolated from an alkaline slag dump

Willscher, Sabine; Bosecker, K.

doi:10.1016/s0304-386x(03)00164-6

Cited by 40 publications

(17 citation statements)

References 21 publications

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“…At the genus level, isolates SU7, KU8, KU4, KU3 and SU3 that are closely related to Arthrobacter, are the dominant group. This genus of bacteria was used by Willscher and Bosecker (2003) in the leaching of alkaline siliceous slag.…”

Section: Discussionmentioning

confidence: 99%

Culturable microorganisms associated with Sishen iron ore and their potential roles in biobeneficiation

Adeleke

Cloete

Khasa

2011

World J Microbiol Biotechnol

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With one of the largest iron ore deposits in the world, South Africa is recognised to be among the top ten biggest exporters of iron ore. Increasing demand and consumption of this mineral triggered search for processing technologies, which can be utilised to "purify" the low-grade iron ore minerals that contain high levels of unwanted potassium (K) and phosphorus (P). This study investigated a potential biological method that can be further developed for the full biobeneficiation of low-grade iron ore minerals. Twenty-three bacterial strains that belong to Proteobacteria, Firmicutes, Bacteroidetes and Actinobateria were isolated from the iron ore minerals and identified with sequence homology and phylogenetic methods. The abilities of these isolates to lower the pH of the growth medium and solubilisation of tricalcium phosphate were used to screen them as potential mineral solubilisers. Eight isolates were successfully screened with this method and utilised in shake flask experiments using iron ore minerals as sources of K and P. The shake flask experiments revealed that all eight isolates have potentials to produce organic acids that aided the solubilisation of the iron ore minerals. In addition, all eight isolates produced high concentrations of gluconic acid followed by relatively lower concentrations of acetic, citric and propanoic acid. Scanning electron microscopy (SEM) and Fourier transform infrared (FTIR) analyses also indicated extracellular polymeric substances could play a role in mineral solubilisation.

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Section: Discussionmentioning

confidence: 99%

Culturable microorganisms associated with Sishen iron ore and their potential roles in biobeneficiation

Adeleke

Cloete

Khasa

2011

World J Microbiol Biotechnol

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“…Bioleaching activities are prominent in acidophilic and chemolithotrophic bacteria (Brandl 2008 ). This capability was also reported from alkaliphilic, heterotrophic microorganisms (Willscher and Bosecker 2001 ), and more recently from some halotolerant actinobacteria such as genera Nocardiopsis (Schippers et al 2002 ). The growth of acidophilic microorganisms are chloride-dependent and are inhibited in presence of high concentration of this ion (Zammit et al 2012 ), thus the halophilic and halotolerant actinobacteria are of special interest due to their ability to thrive in high concentration of NaCl allowing to take advantage of seawater for prospective biomining techniques in drought affected environments.…”

Section: Heavy Metal Bioremediation and Biomining By Halophilic And Hmentioning

confidence: 95%

Biotechnological Exploitation of Actinobacterial Members

Hamedi

Mohammadipanah

Panahi

2015

Sustainable Development and Biodiversity

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Microbial-derived products, while do not have many environmental side effects of their synthetic counterparts, have proved more effi cient than those synthetically obtained. The nature has provided a treasure of microorganisms with capabilities to produce vast variety of novel compounds. This ability has been arised during long last of evolution and adaptation to diverse chemical and physical microenviroments. Microbial-derived metabolites have made their own space in industries and therefore human life. Among these microorganisms, halophilic and halotolerant actinobacteria are recently gaining much attentions. Metabolites and biological functions from halophilic or halotolerant members of this phylum of bacteria may resolving the ever-increasing thirst of industry for metabolites with salttolerancy to cope a range of issues from environmental pollution to diseases and world's hunger. In the current chapter, it has been tried to introduce the less dealt group of halophilic and halotolerant actinobacteria, and shed light on their potential to be exploited in various industry sectors.

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“…Besides the DNA-DNA relatedness, the differences between N. halophila and N. baichengensis also appeared in the major menaquinones and NaCl concentration range for growth. The remarkable characteristic of N. metallicus, differentiating it from other Nocardiopsis species, is the ability to dissolve metals from siliceous, alkaline dump material (Willscher & Bosecker, 2001). N. synnemataformans differs from N. dassonvillei subsp.…”

Section: Phylogenetic Analysis Of the Gyrb Genementioning

confidence: 95%

Phylogenetic relationships of Nocardiopsis species based on partial gyrB and 16S rRNA gene sequences

Yang

Zhi

et al. 2008

Actinomycetologica

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Partial nucleotide sequences of the gyrB gene were determined for members of the genus Nocardiopsis and subjected to phylogenetic analysis. Interspecies DNA similarity values of partial gyrB gene sequences ranged from 79.9 to 99.7% among the Nocardiopsis species. The average similarity of the gyrB gene (87.7%) was significantly less than that of the 16S rRNA gene (96.65%), indicating a high discriminatory power of the gyrB gene. The topology of neighbor-joining, maximum likelihood and maximum parsimony phylogenetic trees based on nucleic acid sequences and protein sequences of gyrB gene were reconstructed. Compared with the 16S rRNA gene dendrogram, the gyrB gene provided more information for understanding the genetic relationships among Nocardiopsis species. Using the information derived from 16S rRNA and gyrB genes, a more comprehensive understanding of the evolutionary history of Nocardiopsis species was obtained.

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Studies on the leaching behaviour of heterotrophic microorganisms isolated from an alkaline slag dump

Cited by 40 publications

References 21 publications

Culturable microorganisms associated with Sishen iron ore and their potential roles in biobeneficiation

Culturable microorganisms associated with Sishen iron ore and their potential roles in biobeneficiation

Biotechnological Exploitation of Actinobacterial Members

Phylogenetic relationships of Nocardiopsis species based on partial gyrB and 16S rRNA gene sequences

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