Heavy metals and soil microbes

Abdu, Nafiu; Abdullahi, Aliyu A.; Abdulkadir, Aisha

doi:10.1007/s10311-016-0587-x

Cited by 263 publications

(79 citation statements)

References 164 publications

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“…The importance of soil fauna (edaphone) as one of the basic components of soil biota within ecosystems is not limited to the decomposition of dead organic matter and the importance of soil fauna is in degradation processes, pedogenesis, and development of soil properties, as well as in their stabilization, including the preservation of soil fertility. In natural as well as anthropogenic ecosystems (e.g., arable land), the individual components of soil fauna react sensitively to a wide range of toxic substances and therefore biological indicators are suitable for early diagnosis of degradation processes [2]. Enzyme activities are currently used as biological indicators of soil quality because they are relatively easy to measure, happen to be environmentally sensitive, and respond rapidly to changes in the soil ecosystem [3].…”

Section: Introductionmentioning

confidence: 99%

Soil Quality and Heavy Metal Pollution Assessment of Iron Ore Mines in Nizna Slana (Slovakia)

Fazekašová

Fazekaš

2020

Sustainability

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Mining activities have resulted in the existence of dumps, which generally present a perpetual danger of moving and transforming toxic elements. The experimental study was carried out in Nizna Slana (Slovakia) where the main source of emission was the iron-ore mining–processing factory focused on siderite mining. Siderit from Nizna Slana is highly ferrous with an increased level of the Mn content. Among the undesirable impurities on the deposit are mainly As, S, Pb, and Zn. According to the environmental regionalization of the Slovak Republic, the surveyed area represents a region with a slightly disturbed environment. The BIOLOG® Eco plates method was used for ecotoxicological evaluation of contaminated soils, where soil enzymes (acidic and alkaline phosphatase and urease) were also monitored in soils and soil contamination was evaluated according to Hakanson (1980). Based on the results obtained, it can be concluded that the content of Hg, Cd, Cr, Cu, As, Fe, Mn, and Mg is above the toxicity level. As, Fe, Mn, and Mg are the most serious pollutants in the area under investigation, and their pronounced excess indicates contamination, where harmfulness and toxicity can be expected. Based on the evaluation of the contamination factor and the degree of contamination, the soils in the emission field of old mining works are very highly to slightly contaminated with heavy metals. The experimental results in the real environment showed that the activity of soil enzymes showed considerable differences, and, regarding the functional diversity of soil microorganisms, we have not seen significant spatial variability.

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Section: Introductionmentioning

confidence: 99%

Soil Quality and Heavy Metal Pollution Assessment of Iron Ore Mines in Nizna Slana (Slovakia)

Fazekašová

Fazekaš

2020

Sustainability

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“…Heavy metal pollution of soils and the environment is the result from industrialization, urbanization, and intensified irrigation water . Heavy metals pollution led to the poor soil health (Abdu, et al, 2017 andBakshi, et al, 2018), surface and groundwater (Mohankumar, et al, 2016) and food contamination (Tchounwou, et al, 2012), which is a hazard to human health (Jovanović, et al, 2015;Oliver and Gregory, 2015;Sarwar, et al, 2017 andYang, et al, 2017;. Therefore, the information of the heavy metal contamination of soils is needed to decide the combined efforts of governments and scientific communities.…”

Section: Introductionmentioning

confidence: 99%

Assessment of heavy metal pollution in soil and bottom sediment of Upper Egypt: comparison study

El‐Anwar

2019

Bull Natl Res Cent

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Background: Aswan and Luxor Governorates are characterized by multifaceted activities such as cement, chemicals, fertilizers, detergents, nitrogen fertilizer factory at Aswan, the sugar and diary factory at Kom Ombo, and several other factories such as the sugar, pulp, paper, ferrosilicon, and phosphate factories at Edfu, urbanization and agriculture. In addition, there is a main sewage station which is used for irrigation of many crops. Assessing the pollution of soil and sediment with some heavy metals in these areas is the main aim of the current work. Results: The average heavy metals content in the studied cultivated soils and Nile sediments are above the acceptable levels. Generally, Nile sediments and cultivated soils at Aswan and Luxor were unpolluted to moderately polluted with heavy metals. Pollution indices indicated that the studied Nile sediments were at considerably ecological risk from Cd (Er = 138.89) and Zn (Er = 140.52). In contrast, the cultivated soil was at very high ecological risk from Cd (Er = 295.24). Conclusions: The current research revealed that the soil and sediments in the Upper Egypt are less polluted than Lower Egypt. Thus, the concentrations of toxic elements are increased from south to north direction in Egypt along the Nile River. The sources of the toxic metals may possibly be natural or anthropogenic in the studied area. The anthropogenic source is resulting from paper, pulp, ferrosilicon factories, and phosphate mining at Edfu. In addition, there are some polluting industries such as sand quarry, shale mining, and the nitrogen fertilizer factory at Aswan. On the other hand, the natural sources of toxic waste are the drains during the seasonal flash floods.

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“…Soil contamination with heavy metals is becoming an increasingly urgent problem worldwide. Among all heavy metals, one of the most hazardous is cadmium (Cd) [1,2]. Cd is a non-essential heavy metal element that is toxic, teratogenic and carcinogenic to humans.…”

Section: Introductionmentioning

confidence: 99%

An operon consisting of a P-type ATPase gene and a transcriptional regulator gene responsible for cadmium resistances in Bacillus vietamensis 151–6 and Bacillus marisflavi 151–25

Ding

et al. 2020

BMC Microbiol

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Background: Cadmium (Cd) is a severely toxic heavy metal to most microorganisms. Many bacteria have developed Cd 2+ resistance. Results: In this study, we isolated two different Cd 2+ resistance Bacillus sp. strains, Bacillus vietamensis 151-6 and Bacillus marisflavi 151-25, which could be grown in the presence of Cd 2+ at concentration up to 0.3 mM and 0.8 mM, respectively. According to the genomic sequencing, transcriptome analysis under cadmium stress, and other related experiments, a gene cluster in plasmid p25 was found to be a major contributor to Cd 2+ resistance in B. marisflavi 151-25. The cluster in p25 contained orf4802 and orf4803 which encodes an ATPase transporter and a transcriptional regulator protein, respectively. Although 151-6 has much lower Cd 2+ resistance than 151-25, they contained similar gene cluster, but in different locations. A gene cluster on the chromosome containing orf4111, orf4112 and orf4113, which encodes an ATPase transporter, a cadmium efflux system accessory protein and a cadmium resistance protein, respectively, was found to play a major role on the Cd 2+ resistance for B. vietamensis 151-6. Conclusions: This work described cadmium resistance mechanisms in newly isolated Bacillus vietamensis 151-6 and Bacillus marisflavi 151-25. Based on homologies to the cad system (CadA-CadC) in Staphylococcus aureus and analysis of transcriptome under Cd 2+ induction, we inferred that the mechanisms of cadmium resistance in B. marisflavi 151-25 was as same as the cad system in S. aureus. Although Bacillus vietamensis 151-6 also had the similar gene cluster to B. marisflavi 151-25 and S. aureus, its transcriptional regulatory mechanism of cadmium resistance was not same. This study explored the cadmium resistance mechanism for B. vietamensis 151-6 and B. marisflavi 151-25 and has expanded our understanding of the biological effects of cadmium.

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Heavy metals and soil microbes

Cited by 263 publications

References 164 publications

Soil Quality and Heavy Metal Pollution Assessment of Iron Ore Mines in Nizna Slana (Slovakia)

Soil Quality and Heavy Metal Pollution Assessment of Iron Ore Mines in Nizna Slana (Slovakia)

Assessment of heavy metal pollution in soil and bottom sediment of Upper Egypt: comparison study

An operon consisting of a P-type ATPase gene and a transcriptional regulator gene responsible for cadmium resistances in Bacillus vietamensis 151–6 and Bacillus marisflavi 151–25

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