Enhanced Growth of Acidocella facilis and Related Acidophilic Bacteria at High Concentrations of Aluminum.

Wakao, Norio; Yasuda, Tsuyoshi; Jojima, Yasuko; Yamanaka, Shigeru; Hiraishi, Akira

doi:10.1264/jsme2.2002.98

Cited by 17 publications

(9 citation statements)

References 36 publications

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“…Organisms related to G. ferruginea were not detected in the neutral/alkaline stream. Sequence analysis of DNA cloned from the acidic stream revealed that presumed acidophilic bacteria related to genera such as Acidocella, Acidiphilium, and Acidobacterium (8,31,32,37) were prevalent and comprised 7% of the total population of clones. Analysis of clones obtained from the very acidic stream revealed large representation by a few eukaryotic species (64% of clones), which were not deliberately targeted using the universal bacterial primers.…”

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confidence: 99%

Biofilm Bacterial Community Structure in Streams Affected by Acid Mine Drainage

Lear

Niyogi

Harding

et al. 2009

Appl Environ Microbiol

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We examined the bacterial communities of epilithic biofilms in 17 streams which represented a gradient ranging from relatively pristine streams to streams highly impacted by acid mine drainage (AMD). A combination of automated ribosomal intergenic spacer analysis with multivariate analysis and ordination provided a sensitive, high-throughput method to monitor the impact of AMD on stream bacterial communities. Significant differences in community structure were detected among neutral to alkaline (pH 6.7 to 8.3), acidic (pH 3.9 to 5.7), and very acidic (pH 2.8 to 3.5) streams. DNA sequence analysis revealed that the acidic streams were generally dominated by bacteria related to the iron-oxidizing genus Gallionella, while the organisms in very acidic streams were less diverse and included a high proportion of acidophilic eukaryotes, including taxa related to the algal genera Navicula and Klebsormidium. Despite the presence of high concentrations of dissolved metals (e.g., Al and Zn) and deposits of iron hydroxide in some of the streams studied, pH was the most important determinant of the observed differences in bacterial community variability. These findings confirm that any restoration activities in such systems must focus on dealing with pH as the first priority.

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confidence: 99%

Biofilm Bacterial Community Structure in Streams Affected by Acid Mine Drainage

Lear

Niyogi

Harding

et al. 2009

Appl Environ Microbiol

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“…Al + 3 ) become soluble in the soil as the pH drops below 5 and therefore may react with many chemical and cellular processes (Kochian 1995). As expected, many soil bacteria were reported to be tolerant to aluminium (Appanna et al 1994;Wakao et al 2002). For example, an acidophilic strain of Flavobacterium sp.…”

Section: Cerradomentioning

confidence: 73%

Brazilian research on extremophiles in the context of astrobiology

Duarte

Nóbrega

Nakayama

et al. 2012

International Journal of Astrobiology

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AbstractExtremophiles are organisms adapted to grow at extreme ranges of environmental variables, such as high or low temperatures, acid or alkaline medium, high salt concentration, high pressures and so forth. Most extremophiles are micro-organisms that belong to the Archaea and Bacteria domains, and are widely spread across the world, which include the polar regions, volcanoes, deserts, deep oceanic sediments, hydrothermal vents, hypersaline lakes, acid and alkaline water bodies, and other extreme environments considered hostile to human life. Despite the tropical climate, Brazil has a wide range of ecosystems which include some permanent or seasonally extreme environments. For example, the Cerrado is a biome with very low soil pH with high Al+3concentration, the mangroves in the Brazilian coast are anaerobic and saline, Pantanal has thousands of alkaline–saline lakes, the Caatinga arid and hot soils and the deep sea sediments in the Brazilian ocean shelf. These environments harbour extremophilic organisms that, coupled with the high natural biodiversity in Brazil, could be explored for different purposes. However, only a few projects in Brazil intended to study the extremophiles. In the frame of astrobiology, for example, these organisms could provide important models for defining the limits of life and hypothesize about life outside Earth. Brazilian microbiologists have, however, studied the extremophilic micro-organisms inhabiting non-Brazilian environments, such as the Antarctic continent. The experience and previous results obtained from the Brazilian Antarctic Program (PROANTAR) provide important results that are directly related to astrobiology. This article is a brief synopsis of the Brazilian experience in researching extremophiles, indicating the most important results related to astrobiology and some future perspectives in this area.

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“…have been shown not only to be tolerant to aluminum, but also exhibited increased growth in its presence (Wakao et al, 2002). Aluminum phosphate and aluminum sulfate provided the greatest enhancement in growth at a pH of 3.5 and lower (Wakao et al, 2002). Acidocella sp.…”

Section: Aluminum Glazesmentioning

confidence: 99%