Toxicity of copper, lead, nickel and zinc in agar culture to aerobic, diazotrophic bacteria extracted from waste-derived compost

Keeling, A.A.; Cater, Giles L. F.

doi:10.1016/s0045-6535(98)00105-2

Cited by 17 publications

(7 citation statements)

References 13 publications

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“…Oliveira and Pampulha (2006) reported marked decrease in total culturable bacterial population as well as those of asymbiotic N-fixing bacteria in As contaminated soil. Similar effects on heterotrophic and diazotrophic populations were observed by Keeling and Cater (1998) in Cu, Pb and Zn contaminated soils. Moriera et al (2008) likewise reported decrease in populations of associative diazotrophs from Cd and Zn contaminated soils when evaluated using a number of N-free media.…”

Section: Effects Of Metals On Microbial Diversity Based On Biochemicasupporting

confidence: 75%

Effects of Metal and Metalloid Contamination on Microbial Diversity and Activity in Agricultural Soils

Tipayno¹,

Chauhan²,

Woo³

et al. 2011

Korean Journal of Soil Science and Fertilizer

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The continuous increase in the production of metals and their subsequent release into the environment has lead to increased concentration of these elements in agricultural soils. Because microbes are involved in almost every chemical transformations taking place in the soil, considerable attention has been given to assessing their responses to metal contaminants. Short-term and long-term exposures to toxic metals have been shown to reduce microbial diversity, biomass and activities in the soil. Several studies show that microbial parameters like basal respiration, metabolic quotient, and enzymatic activities, including those of oxidoreductases and those involved in the cycle of C, N, P and other elements, exhibit sensitivity to soil metal concentrations. These have been therefore, regarded as good indices for assessing the impact of metal contaminants to the soil. Metal contamination has also been extensively shown to decrease species diversity and cause shifts in microbial community structure. Biochemical and molecular techniques that are currently being employed to detect these changes are continuously challenged by several limiting factors, although showing some degree of sensitivity and efficiency. Variations and inconsistencies in the responses of bioindicators to metal stress in the soil can also be explained by differences in bioavailability of the metal to the microorganisms. This, in turn, is influenced by soil characteristics such as CEC, pH, soil particles and other factors. Therefore, aside from selecting the appropriate techniques to better understand microbial responses to metals, it is also important to understand the prevalent environmental conditions that interplay to bring about observed changes in any given soil parameter.

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Section: Effects Of Metals On Microbial Diversity Based On Biochemicasupporting

confidence: 75%

Effects of Metal and Metalloid Contamination on Microbial Diversity and Activity in Agricultural Soils

Tipayno¹,

Chauhan²,

Woo³

et al. 2011

Korean Journal of Soil Science and Fertilizer

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“…Lead (Pb) interfered with cell growth and glucose fermentation by C. butyricum at 25 mg L −1 Pb 25. Nickel also inhibited cell growth 26. It should be pointed out, however, that the increasing levels of inhibition at increasing concentrations of various grades of pre‐treated SOB‐RG should not be attributed to metal and heavy metal ions such as sodium, lead and nickel, as the concentration of these ions never exceeded 0.068, 1.50 and 3.0 mg L −1 , respectively, in all experiments.…”

Section: Resultsmentioning

confidence: 99%

X‐Ray Photoelectron Spectroscopy of Ferrocenyl‐ and Ferrocenium‐Based Ionic Liquids

Taylor

Licence

2012

ChemPhysChem

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X-ray photoelectron spectroscopy (XPS) is used to study a series of five 1-(ferrocenylmethyl)-3-methylimidazolium- and 1-(ferroceniummethyl)-3-methylimidazolium-based salts. All samples emit good photoelectron fluxes with sharp, well-resolved photoelectron peaks. Due to the low volatility of imidazolium-salts at ambient temperature, no modification of the XP spectrometer was required. Two of the salts exhibit supercooling behaviour, allowing XPS to be recorded at room temperature on liquid samples without the need for charge neutralisation. The photoelectron peaks can be assigned to the component atoms of the salts, based on previous studies on ferrocene, ferrocenium-compounds and ionic liquids. Oxidation of the ferrocenyl moiety to ferrocenium shiftsthe Fe 2p and cyclopentadienyl C 1s photoelectron peaks to higher binding energy but does not affect the imidazolium and anion peaks. Under charge-neutralisation conditions, in which the sample is flooded with low-energy electrons, the ferrocenium moiety of the salt 1-(ferroceniummethyl)-3-methylimidazolium di(hexafluorophosphate) is partially reduced.

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“…This indicates that the longer lag times and/or lower specific growth rates may be the result of Pb(II) penetrating into the periplasm or cytoplasm to react with intracellular components. At toxic concentrations, Pb(II) is known to have detrimental effects on growth and metabolism [26,39,64] and may also replace metal constituents of the active centers of enzymes, cofactors, or other biomolecules. This may result in the denaturation and inactivation of enzymes and the disruption of cell organellemembrane integrity and cell division [3,[13][14][15]65].…”

Section: Influence Of Lactate and Initial Cell Concentrations On Pb(imentioning

confidence: 99%

Toxicity of Lead in Aqueous Medium to Desulfovibrio Desulfuricans G20

Sani¹,

Peyton²,

Jandhyala³

2003

Environ Toxicol Chem

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The toxicity of Pb(II) to sulfate-reducing bacteria (SRB) was studied using Desulfovibrio desulfuricans G20 in a medium specifically designed to assess metal toxicity. The effects of Pb(II) toxicity were observed in terms of longer lag times, lower specific growth rates, and in some cases no measurable growth. With an increase in medium pH from 6 to 8, Pb(II) toxicity decreased. At all pH values, in the presence of Pb(II) concentrations ranging from 3 to 15 microM, specific growth rates decreased and lag times increased. The minimum inhibiting concentration (MIC) of Pb(II) causing a complete inhibition in growth at pH 6 was 10 microM, as compared to 15 microM at pH 7.2 and 8. These MIC values are 40 times lower than previously reported for SRB. Results also show that with increases in initial cell protein concentration (inoculum size), soluble Pb(II) removal rates increased and the degree to which Pb(II) caused increased lag times was reduced. In the presence of Pb(II), in all cases in which D. desulfuricans grew (even after a 312-h lag time), the final cell protein concentration was equivalent to that of the Pb-free control. Live/dead staining, based on membrane integrity, indicated that while Pb(II) inhibited growth, Pb(II) did not cause a loss of D. desulfuricans membrane integrity.

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Toxicity of copper, lead, nickel and zinc in agar culture to aerobic, diazotrophic bacteria extracted from waste-derived compost

Cited by 17 publications

References 13 publications

Effects of Metal and Metalloid Contamination on Microbial Diversity and Activity in Agricultural Soils

Effects of Metal and Metalloid Contamination on Microbial Diversity and Activity in Agricultural Soils

X‐Ray Photoelectron Spectroscopy of Ferrocenyl‐ and Ferrocenium‐Based Ionic Liquids

Toxicity of Lead in Aqueous Medium to Desulfovibrio Desulfuricans G20

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