Solubilization of zinc salts by a bacterium isolated from the air environment of a tannery

Fasim, Fehmida; Ahmed, Nuzhat; Parsons, Ruth; Gadd, Geoffrey Michael

doi:10.1111/j.1574-6968.2002.tb11277.x

Cited by 308 publications

(126 citation statements)

References 28 publications

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“…[57] iii) S. aureus strains are equipped with more potent detoxification agents such as antioxidant enzymes, particularly catalase. [34c,58] However, other factors such as differences in the mode of association of the particles to the cell membrane, capability of solubilizing ZnO and extracting harmful Zn 2þ ions, [59] and cell permeability may also be considered.…”

Section: Antibacterial Testsmentioning

confidence: 99%

Enhanced Antibacterial Activity of Nanocrystalline ZnO Due to Increased ROS‐Mediated Cell Injury

Applerot

Lipovsky

Dror

et al. 2009

Adv Funct Materials

904

522

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An innovative study aimed at understanding the influence of the particle size of ZnO (from the microscale down to the nanoscale) on its antibacterial effect is reported herein. The antibacterial activity of ZnO has been found to be due to a reaction of the ZnO surface with water. Electron‐spin resonance measurements reveal that aqueous suspensions of small nanoparticles of ZnO produce increased levels of reactive oxygen species, namely hydroxyl radicals. Interestingly, a remarkable enhancement of the oxidative stress, beyond the level yielded by the ZnO itself, is detected following the antibacterial treatment. Likewise, an exposure of bacteria to the small ZnO nanoparticles results in an increased cellular internalization of the nanoparticles and bacterial cell damage. An examination of the antibacterial effect is performed on two bacterial species: Escherichia coli (Gram negative) and Staphylococcus aureus (Gram positive). The nanocrystalline particles of ZnO are synthesized using ultrasonic irradiation, and the particle sizes are controlled using different solvents during the sonication process. Taken as a whole, it is apparent that the unique properties (i.e., small size and corresponding large specific surface area) of small nanometer‐scale ZnO particles impose several effects that govern its antibacterial action. These effects are size dependent and do not exist in the range of microscale particles.

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Section: Antibacterial Testsmentioning

confidence: 99%

Enhanced Antibacterial Activity of Nanocrystalline ZnO Due to Increased ROS‐Mediated Cell Injury

Applerot

Lipovsky

Dror

et al. 2009

Adv Funct Materials

904

522

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show abstract

“…Tris-minimal salts medium (MS medium) (Fasim et al 2002) containing the carbon source D-glucose (10 g L −1 ), and solidified using agar (15 g L −1 ), was employed for solid and liquid culture of metal mobilization assays. The medium also contained (L −1 ): Tris-HCl, 6.06 g; NaCl, 4.68 g; KCl, 1.49 g; NH 4 Cl, 1.07 g; Na 2 SO 4 , 0.43 g; MgCl 2 2H 2 O, 0.2 g; CaCl 2 2H 2 O, 30 mg, with pH adjusted to 7.…”

Section: Culture Media and Chemicalsmentioning

confidence: 99%

Metal mobilization and production of short-chain organic acids by rhizosphere bacteria associated with a Cd/Zn hyperaccumulating plant, Sedum alfredii

Wong

2009

Plant Soil

105

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Sedum alfredii, a cadmium (Cd) and zinc (Zn) hyperaccumulator at a mine located in Qu Zhou City, Zhejiang Province, China, can accumulate Cd and Zn exceeding 1,000 and 10,000 mg kg −1 , respectively in its shoot (dry weight) when growing under metal-contaminated habitats. Several strains of bacteria were isolated from the rhizosphere of S. alfredii thriving in different Pb/Zn mines in Hunan Province and Zhejiang Province, China, which can resist high levels of heavy metals. Among the different strains isolated, Burkholderia cepacia showed the highest ability in mobilizing Cd and Zn as well as resisting high concentrations of soluble Zn (500 mg L −1 ). The soluble Zn concentration in the medium increased from 13 to 72 and 99% (p<0.001) after bacterial inoculation in the medium supplemented with insoluble zinc oxide and zinc carbonate, respectively, while pH dropped from 7 to 2.93. The soluble Cd concentration was also increased from 8 to 96% (p<0.001), and pH decreased from 7 to 2.65. Short-chain organic acids were also analyzed and the results indicated that oxalic acid, tartaric acid, formic acid and acetic acid had a significant correlation (p< 0.001) with the concentrations of Cd and Zn being mobilized during the assay. The present results implicated that certain bacteria associated with metal hyperaccumulators could contribute significantly in mobilizing heavy metals, which would enhance the phytoextraction process.

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“…Currently, the main purpose in managing soil P is to optimize crop production and minimize P loss from soils. Recently, phosphate solubilizing microorganisms (PSMs) have attracted the attention of agriculturists as soil inoculums to improve plant growth and yield (Fasim et al 2002;Goldstein et al 1999;Young et al 1998).…”

Section: Introductionmentioning

confidence: 98%

Solubilization of insoluble inorganic phosphates by a novel temperature-, pH-, and salt-tolerant yeast, Rhodotorula sp. PS4, isolated from seabuckthorn rhizosphere, growing in cold desert of Ladakh, India

Mundra

Arora

Stobdan

2011

World J Microbiol Biotechnol

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The study was aimed to develop biofertilizer solubilizing inorganic phosphates for region experiencing temperature, pH and salt stressed conditions. A yeast strain PS4, which was temperature-, pH-and salt-tolerant and capable of solubilizing insoluble inorganic phosphate was isolated from rhizosphere of seabuckthorn (Hippophae rhamnoides L.), growing in the Indian Trans-Himalaya. Based on morphological, biochemical, whole cell FAME analysis and molecular characterization, strain PS4 was identified as Rhodotorula sp. The soluble phosphate production under optimal conditions at pH 7 and 30°C was 278.3 mg l -1 . Strain PS4 showed ability to solubilize insoluble phosphate under different stress conditions viz. 5-40°C temperature, 1-5% salt concentration and 3-11 pH range. Soluble phosphate production from Ca 3 (PO 4 ) 2 under combined stress conditions at extreme values of temperature, pH and salt concentration showed 81.6-83.2% reduction as compare to optimal conditions after 5 days incubation. The strain solubilize Ca 3 (PO 4 ) 2 to a great extent than FePO 4 and AlPO 4 . The solubilization of insoluble phosphate was associated with drop in pH of the culture media. Inoculation of tomato seedling with the strain increased fruit yield, roots and shoot length. Rhodotorula sp. PS4 with phosphate-solubilizing ability under stress conditions appeared to be attractive for exploring their plant growth-promoting activity towards the development of microbial inoculants in stressed region.

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Solubilization of zinc salts by a bacterium isolated from the air environment of a tannery

Cited by 308 publications

References 28 publications

Enhanced Antibacterial Activity of Nanocrystalline ZnO Due to Increased ROS‐Mediated Cell Injury

Enhanced Antibacterial Activity of Nanocrystalline ZnO Due to Increased ROS‐Mediated Cell Injury

Metal mobilization and production of short-chain organic acids by rhizosphere bacteria associated with a Cd/Zn hyperaccumulating plant, Sedum alfredii

Solubilization of insoluble inorganic phosphates by a novel temperature-, pH-, and salt-tolerant yeast, Rhodotorula sp. PS4, isolated from seabuckthorn rhizosphere, growing in cold desert of Ladakh, India

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