351
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Krishnan S, Narayan S, Chadha A. Whole resting cells vs. cell free extracts of Candida parapsilosis ATCC 7330 for the synthesis of gold nanoparticles. AMB Express 2016; 6:92. [PMID: 27718213 PMCID: PMC5055519 DOI: 10.1186/s13568-016-0268-y] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/15/2016] [Accepted: 10/03/2016] [Indexed: 11/10/2022] Open
Abstract
The cell free extracts of Candida parapsilosis ATCC 7330 are more efficient than the whole resting cells of the yeast in the synthesis of directly usable gold nanoparticles as revealed by this systematic study. Cell free extracts yielded gold nanoparticles of hydrodynamic diameter (50-200 nm). In this study, the total protein concentration influences the nanofabrication and not only the reductase enzymes as originally thought. Powder X-ray diffraction studies confirm the crystalline nature of the gold nanoparticles. Fourier Transform Infra Red spectroscopy and thermal gravimetric analysis suggests that the biosynthesized gold nanoparticles are capped by peptides/proteins. Dispersion experiments indicate a stable dispersion of gold nanoparticles in pH 12 solutions which is also confirmed by electron microscopic analysis and validated using a surface plasmon resonance assay. The effectiveness of the dispersed nanoparticles for the reduction of 4-nitrophenol using sodium borohydride as a reductant further confirms the formation of functional gold nanoparticles. It is also reported that gold nanoparticles with mean particle diameter of 27 nm are biosynthesized inside the whole cell by transmission electron microscopy analysis. With optimized reaction conditions, maximum gold bioaccumulation with the 24 h culture age of the yeast with cellular uptake of ~1010 gold atoms at the single cell level is achieved but it is not easy to extract the gold nanoparticles from the whole resting cells.
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Affiliation(s)
- Saravanan Krishnan
- Laboratory of Bioorganic Chemistry, Department of Biotechnology, Indian Institute of Technology Madras, Chennai, India
| | - Shoba Narayan
- Laboratory of Bioorganic Chemistry, Department of Biotechnology, Indian Institute of Technology Madras, Chennai, India
- Faculty of Allied Health Sciences, Chettinad Academy of Research and Education, Kelambakkam, Chennai, India
| | - Anju Chadha
- Laboratory of Bioorganic Chemistry, Department of Biotechnology, Indian Institute of Technology Madras, Chennai, India
- National Center for Catalysis Research, Indian Institute of Technology Madras, Chennai, India
- Centre for NEMS and Nanophotonics, Indian Institute of Technology Madras, Chennai, India
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352
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Value added phytoremediation of metal stressed soils using phosphate solubilizing microbial consortium. World J Microbiol Biotechnol 2016; 33:9. [PMID: 27858338 DOI: 10.1007/s11274-016-2176-3] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2016] [Accepted: 11/09/2016] [Indexed: 10/20/2022]
Abstract
The presence of heavy metals in the soil is a matter of growing concern due to their toxic and non-biodegradable nature. Lack of effectiveness of various conventional methods due to economic and technical constraints resulted in the search for an eco-friendly and cost-effective biological techniques for heavy metal removal from the environment. Until now, phytoremediation has emerged as an innovative technique to address the problem. However, the efficiency of phytoremediation process is hindered under the high metal concentration conditions. Hence, phosphate solubilizing microbes (PSM) assisted phytoremediation technique is gaining more insight as it can reduce the contamination load even under elevated metal stressed conditions. These microbes convert heavy metals into soluble and bioavailable forms, which consequently facilitate phytoremediation. Several studies have reported that the use of microbial consortium for remediation is considered more effective as compared to single strain pure culture. Therefore, this review paper focuses on the current trends in research related to PSM mediated uptake of heavy metal by plants. The efficiency of PSM consortia in enhancing the phytoremediation process has also been reviewed. Moreover, the role of phosphatase enzymes in the mineralization of organic forms of phosphate in soil is further discussed. Biosurfactant mediated bioremediation of metal polluted soils is a matter of extensive research nowadays. Hence, the recent advancement of using biosurfactants in enhanced phytoremediation of metal stressed soils is also described.
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353
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Nirola R, Megharaj M, Beecham S, Aryal R, Thavamani P, Vankateswarlu K, Saint C. Remediation of metalliferous mines, revegetation challenges and emerging prospects in semi-arid and arid conditions. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2016; 23:20131-20150. [PMID: 27539471 DOI: 10.1007/s11356-016-7372-z] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/04/2016] [Accepted: 08/01/2016] [Indexed: 05/23/2023]
Abstract
Understanding plant behaviour in polluted soils is critical for the sustainable remediation of metal-polluted sites including abandoned mines. Post-operational and abandoned metal mines particularly in semi-arid and arid zones are one of the major sources of pollution by soil erosion or plant hyperaccumulation bringing ecological impacts. We have selected from the literature 157 species belonging to 50 families to present a global overview of 'plants under action' against heavy metal pollution. Generally, all species of plants that are drought, salt and metal tolerant are candidates of interest to deal with harsh environmental conditions, particularly at semi-arid and arid mine sites. Pioneer metallophytes namely Atriplex nummularia, Atriplex semibaccata, Salsola kali, Phragmites australis and Medicago sativa, representing the taxonomic orders Caryophyllales, Poales and Fabales are evaluated in terms of phytoremediation in this review. Phytoremediation processes, microbial and algal bioremediation, the use and implication of tissue culture and biotechnology are critically examined. Overall, an integration of available remediation plant-based technologies, referred to here as 'integrated remediation technology,' is proposed to be one of the possible ways ahead to effectively address problems of toxic heavy metal pollution. Graphical abstract Integrated remediation technology (IRT) in metal-contaminated semi-arid and arid conditions. The hexagonal red line represents an IRT concept based on remediation decisions by combination of plants and microbial processes.
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Affiliation(s)
- Ramkrishna Nirola
- Future Industries Institute, Division of Information Technology, Engineering and the Environment, University of South Australia, Adelaide, SA, 5095, Australia.
- Natural & Built Environments Research Centre, Division of Information Technology, Engineering and the Environment, University of South Australia, Adelaide, SA, 5095, Australia.
| | - Mallavarapu Megharaj
- Global Centre for Environmental Remediation (GCER), University of Newcastle, ATC Building, Callaghan, Newcastle, NSW, 2308, Australia
| | - Simon Beecham
- Natural & Built Environments Research Centre, Division of Information Technology, Engineering and the Environment, University of South Australia, Adelaide, SA, 5095, Australia
| | - Rupak Aryal
- Natural & Built Environments Research Centre, Division of Information Technology, Engineering and the Environment, University of South Australia, Adelaide, SA, 5095, Australia
| | - Palanisami Thavamani
- Global Centre for Environmental Remediation (GCER), University of Newcastle, ATC Building, Callaghan, Newcastle, NSW, 2308, Australia
| | | | - Christopher Saint
- Natural & Built Environments Research Centre, Division of Information Technology, Engineering and the Environment, University of South Australia, Adelaide, SA, 5095, Australia
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354
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Oladipo OG, Olayinka A, Awotoye OO. Maize (Zea mays L.) performance in organically amended mine site soils. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2016; 181:435-442. [PMID: 27415409 DOI: 10.1016/j.jenvman.2016.07.009] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/30/2015] [Revised: 06/22/2016] [Accepted: 07/03/2016] [Indexed: 06/06/2023]
Abstract
Organic amendments play an important role in the eco-friendly remediation of degraded mine site soils. This study investigated the quality (essential nutrients and heavy metal content) of maize grown on organically amended soils from three active mines in Nigeria. Soil samples were collected randomly at 0-15 cm depth, air-dried and sieved. Five kg of soil were amended with poultry manure and sawdust (poultry manure only, sawdust only, poultry manure-sawdust mixtures in 3:1, 2:1 and 1:1 ratios) at 10 g kg(-1). Maize (Zea mays L.) seeds were planted and watered for two consecutive periods of 8 weeks, with the control and treatment experiments set up in the screenhouse in quadruples. Harvested tissues were weighed, dried, ground and digested. Chemical properties were determined using standard methods while atomic absorption spectrophotometry was used to determine total metal concentrations (Ca, Mg, Fe, Zn, Pb, Cd and Cu). ANOVA was used to test for significant differences among treatment groups in the various parameters. Application of poultry manure-sawdust mixtures significantly (p < 0.05) enhanced tissue dry matter yield, as well as N, P, K, and Na contents while Zn, Cd, Cu and Pb were immobilized to approximately 50-100%. Treatment with sawdust alone reduced tissue nutrient content resulting in depressed plant yield while poultry manure only though enhanced crop yield, contained higher heavy metal contents. Soil amendments comprised of poultry manure-sawdust mixtures can be effective remediation strategy for mine site soils, as these organic materials help replenish soil nutrients, immobilize heavy metals, and enhance food productivity.
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Affiliation(s)
- Oluwatosin Gbemisola Oladipo
- Unit for Environmental Sciences and Management, North West University, Potchefstroom, Private Bag X6001, Potchefstroom 2520, South Africa; Institute of Ecology and Environmental Science, Obafemi Awolowo University, Ile - Ife, Nigeria.
| | - Akinyemi Olayinka
- Department of Soil and Land Resources, Obafemi Awolowo University, Ile - Ife, Nigeria
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355
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Bhat IUH, Mauris EN, Khanam Z. Phytoremediation of iron from red soil of tropical region by using Centella asiatica. INTERNATIONAL JOURNAL OF PHYTOREMEDIATION 2016; 18:918-23. [PMID: 26940261 DOI: 10.1080/15226514.2016.1156637] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/09/2023]
Abstract
The accumulation and removal efficiency of Fe by Centella asiatica was carried out at various Fe concentrations in soil treatments (0, 50, 100, 150 and 200 mg Fe/kg soil). Iron accumulation in different parts of C. asiatica (leaf, stem and root) was analyzed by atomic absorption spectrophotometer (AAS). Factorial experiment with a completely randomized design and Duncan's test were used for data analyses. The results revealed that C. asiatica have the ability to uptake and accumulate Fe significantly (p < 0.05; r = 0.977) in the aerial parts. The different soil treatments had significant effect on the total Fe accumulations in C. asiatica (p < 0.05). The potential of C. asiatica as a metal hyperaccumulator plant, harvested for analysis, shows efficient accumulation of Fe at high concentration (p < 0.05; r = 0.977). The root showed the highest accumulation of Fe followed by the leaves (p < 0.05) and the stem (p < 0.05). The Pearson correlation coefficient between leaves and root have showed highly significant correlation (p < 0.01; r = 0.785) as compared to the leaves and stem (p < 0.01; r = 0.780). The efficiency of Fe removal by C. asiatica from the contaminated soil has been evaluated by bioconcentration factor and translocation factor, found to be >1 and <1, respectively, further supporting its metal hyperaccumulator properties.
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Affiliation(s)
- Irshad Ul Haq Bhat
- a Faculty of Earth Science, University Malaysia Kelantan , Kelantan , Malaysia
| | - Eddma Nathan Mauris
- a Faculty of Earth Science, University Malaysia Kelantan , Kelantan , Malaysia
| | - Zakia Khanam
- b Faculty of Agro Based Industry, University Malaysia Kelantan , Kelantan , Malaysia
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356
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Zhang Y, Lu X, Wang N, Xin M, Geng S, Jia J, Meng Q. Heavy metals in aquatic organisms of different trophic levels and their potential human health risk in Bohai Bay, China. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2016; 23:17801-17810. [PMID: 27250089 DOI: 10.1007/s11356-016-6948-y] [Citation(s) in RCA: 44] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/08/2016] [Accepted: 05/20/2016] [Indexed: 06/05/2023]
Abstract
Fourteen aquatic organism samples were collected from Bohai Bay, and concentrations of five heavy metals were measured to evaluate the pollution levels in aquatic organisms and the potential risk to human health. The concentrations of Zn and Cu were much higher than those of Cd, Cr, and Pb in all the organisms. In general, the heavy metal concentration levels were in the order phytoplankton < zooplankton < fish < shrimp < shellfish. Heavy metal concentrations in higher trophic-level aquatic organisms in Bohai Bay were compared to those in the organisms from other worldwide coastal waters. The concentration levels of most heavy metals were higher than the 75th percentile, except that Pb concentration was between the 25th and 50th percentiles. The calculated bioconcentration factors (BCF) of Cr, Cu, and Pb for phytoplankton were less than 100, indicating no accumulation in primary producers. The bioaccumulation factor (BAF) of Pb for zooplankton was the highest, indicating significant Pb accumulation in zooplankton. For higher trophic-level aquatic organisms, the order of BAF values was fish < shrimp < shellfish for most metals except for Pb. The human health risk assessment suggests that strict abatement measures of heavy metals must be taken to decrease the health risk caused by consuming aquatic products.
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Affiliation(s)
- Yan Zhang
- Tianjin Academy of Environmental Sciences, Tianjin, 300191, China
| | - Xueqiang Lu
- Tianjin Academy of Environmental Sciences, Tianjin, 300191, China.
| | - Naili Wang
- Tianjin Huanke Testing Technology Company Limited, Tianjin, 300191, China
| | - Meinan Xin
- Tianjin Academy of Environmental Sciences, Tianjin, 300191, China
| | - Shiwei Geng
- Tianjin Academy of Environmental Sciences, Tianjin, 300191, China
| | - Jing Jia
- Tianjin Huanke Testing Technology Company Limited, Tianjin, 300191, China
| | - Qinghui Meng
- Tianjin Huanke Testing Technology Company Limited, Tianjin, 300191, China
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357
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Li X, Peng W, Jia Y, Lu L, Fan W. Bioremediation of lead contaminated soil with Rhodobacter sphaeroides. CHEMOSPHERE 2016; 156:228-235. [PMID: 27179240 DOI: 10.1016/j.chemosphere.2016.04.098] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/19/2016] [Revised: 04/13/2016] [Accepted: 04/24/2016] [Indexed: 05/17/2023]
Abstract
Bioremediation with microorganisms is a promising technique for heavy metal contaminated soil. Rhodobacter sphaeroides was previously isolated from oil field injection water and used for bioremediation of lead (Pb) contaminated soil in the present study. Based on the investigation of the optimum culturing conditions and the tolerance to Pb, we employed the microorganism for the remediation of Pb contaminated soil simulated at different contamination levels. It was found that the optimum temperature, pH, and inoculum size for R. sphaeroides is 30-35 °C, 7, and 2 × 10(8) mL(-1), respectively. Rhodobacter sphaeroides did not remove the Pb from soil but did change its speciation. During the bioremediation process, more available fractions were transformed to less accessible and inert fractions; in particular, the exchangeable phase was dramatically decreased while the residual phase was substantially increased. A wheat seedling growing experiment showed that Pb phytoavailability was reduced in amended soils. Results inferred that the main mechanism by which R. sphaeroides treats Pb contaminated soil is the precipitation formation of inert compounds, including lead sulfate and lead sulfide. Although the Pb bioremediation efficiency on wheat was not very high (14.78% root and 24.01% in leaf), R. sphaeroides remains a promising alternative for Pb remediation in contaminated soil.
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Affiliation(s)
- Xiaomin Li
- School of Space and Environment, Beihang University, 37 Xueyuan Road, Haidian District, Beijing 100191, PR China
| | - Weihua Peng
- School of Space and Environment, Beihang University, 37 Xueyuan Road, Haidian District, Beijing 100191, PR China
| | - Yingying Jia
- School of Space and Environment, Beihang University, 37 Xueyuan Road, Haidian District, Beijing 100191, PR China
| | - Lin Lu
- School of Space and Environment, Beihang University, 37 Xueyuan Road, Haidian District, Beijing 100191, PR China
| | - Wenhong Fan
- School of Space and Environment, Beihang University, 37 Xueyuan Road, Haidian District, Beijing 100191, PR China.
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358
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Kogbara RB, Ogar I, Okparanma RN, Ayotamuno JM. Treatment of petroleum drill cuttings using bioaugmentation and biostimulation supplemented with phytoremediation. JOURNAL OF ENVIRONMENTAL SCIENCE AND HEALTH. PART A, TOXIC/HAZARDOUS SUBSTANCES & ENVIRONMENTAL ENGINEERING 2016; 51:714-721. [PMID: 27128694 DOI: 10.1080/10934529.2016.1170437] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
This study sought to compare the effectiveness of bioaugmentation and biostimulation, as well as the combination of both techniques, supplemented with phytoremediation, in the decontamination of petroleum drill cuttings. Drill cuttings with relatively low concentration of total petroleum hydrocarbons (TPH) and metals were mixed with soil in the ratio 5:1 and treated with three different combinations of the bioremediation options. Option A entailed bioaugmentation supplemented with phytoremediation. Option B had the combination of biostimulation and bioaugmentation supplemented with phytoremediation. While biostimulation supplemented with phytoremediation was deployed in option C. Option O containing the drill cuttings-soil mixture without treatment served as untreated control. Fertilizer application, tillage and watering were used for biostimulation treatment, while spent mushroom substrate (Pleurotus ostreatus) and elephant grass (Pennisetum purpureum) were employed for bioaugmentation and phytoremediation treatment, respectively. The drill cuttings-soil mixtures were monitored for TPH, organic carbon, total nitrogen, pH, metal concentrations, and fungal counts, over time. After 56 days of treatment, there was a decline in the initial TPH concentration of 4,114 mg kg(-1) by 5.5%, 68.3%, 75.6% and 48% in options O, A, B and C, respectively. Generally, higher TPH loss resulted from the phytoremediation treatment stage. The treated options also showed slight reductions in metal concentrations ranging from 0% to 16% of the initial low concentrations. The results highlight the effectiveness of bioaugmentation supplemented with phytoremediation. The combination of bioaugmentation and biostimulation supplemented with phytoremediation, however, may prove better in decontaminating petroleum drill cuttings to environmentally benign levels.
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Affiliation(s)
- Reginald B Kogbara
- a Department of Agricultural and Environmental Engineering , Rivers State University of Science and Technology , Port Harcourt , Nigeria
- b Mechanical Engineering Program, Texas A&M University at Qatar , Doha , Qatar
| | - Innocent Ogar
- a Department of Agricultural and Environmental Engineering , Rivers State University of Science and Technology , Port Harcourt , Nigeria
| | - Reuben N Okparanma
- a Department of Agricultural and Environmental Engineering , Rivers State University of Science and Technology , Port Harcourt , Nigeria
| | - Josiah M Ayotamuno
- a Department of Agricultural and Environmental Engineering , Rivers State University of Science and Technology , Port Harcourt , Nigeria
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359
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Genetic basis and importance of metal resistant genes in bacteria for bioremediation of contaminated environments with toxic metal pollutants. Appl Microbiol Biotechnol 2016; 100:2967-84. [PMID: 26860944 DOI: 10.1007/s00253-016-7364-4] [Citation(s) in RCA: 107] [Impact Index Per Article: 13.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2015] [Revised: 01/26/2016] [Accepted: 01/28/2016] [Indexed: 10/22/2022]
Abstract
Metal pollution is one of the most persistent and complex environmental issues, causing threat to the ecosystem and human health. On exposure to several toxic metals such as arsenic, cadmium, chromium, copper, lead, and mercury, several bacteria has evolved with many metal-resistant genes as a means of their adaptation. These genes can be further exploited for bioremediation of the metal-contaminated environments. Many operon-clustered metal-resistant genes such as cadB, chrA, copAB, pbrA, merA, and NiCoT have been reported in bacterial systems for cadmium, chromium, copper, lead, mercury, and nickel resistance and detoxification, respectively. The field of environmental bioremediation has been ameliorated by exploiting diverse bacterial detoxification genes. Genetic engineering integrated with bioremediation assists in manipulation of bacterial genome which can enhance toxic metal detoxification that is not usually performed by normal bacteria. These techniques include genetic engineering with single genes or operons, pathway construction, and alternations of the sequences of existing genes. However, numerous facets of bacterial novel metal-resistant genes are yet to be explored for application in microbial bioremediation practices. This review describes the role of bacteria and their adaptive mechanisms for toxic metal detoxification and restoration of contaminated sites.
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360
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Prabhakaran P, Ashraf MA, Aqma WS. Microbial stress response to heavy metals in the environment. RSC Adv 2016. [DOI: 10.1039/c6ra10966g] [Citation(s) in RCA: 87] [Impact Index Per Article: 10.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Heavy metal contamination is a global environmental issue as it poses a significant threat to public health, and exposure to metals above a certain threshold level can cause deleterious effects in all living organisms including microbes.
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Affiliation(s)
- Pranesha Prabhakaran
- School of Biosciences and Biotechnology
- Faculty of Science and Technology
- Universiti Kebangsaan Malaysia
- 43600 Bangi
- Malaysia
| | - Muhammad Aqeel Ashraf
- Faculty of Science & Natural Resources
- Universiti Malaysia Sabah
- 88400 Kota Kinabalu
- Malaysia
- Department of Environmental Science and Engineering
| | - Wan Syaidatul Aqma
- School of Biosciences and Biotechnology
- Faculty of Science and Technology
- Universiti Kebangsaan Malaysia
- 43600 Bangi
- Malaysia
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361
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Huang J, Liu Z, Li S, Xu B, Gong Y, Yang Y, Sun H. Isolation and engineering of plant growth promoting rhizobacteria Pseudomonas aeruginosa for enhanced cadmium bioremediation. J GEN APPL MICROBIOL 2016; 62:258-265. [DOI: 10.2323/jgam.2016.04.007] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Affiliation(s)
- Junli Huang
- Institute of Genomic Medicine, College of Pharmacy, Jinan University
| | - Zhaobing Liu
- Institute of Genomic Medicine, College of Pharmacy, Jinan University
| | - Shiyu Li
- Genetic Engineering Research Institute, Southern Medical University
| | - Bo Xu
- Institute of Genomic Medicine, College of Pharmacy, Jinan University
| | - Yahui Gong
- Institute of Genomic Medicine, College of Pharmacy, Jinan University
| | - Yan Yang
- Institute of Genomic Medicine, College of Pharmacy, Jinan University
| | - Hanxiao Sun
- Institute of Genomic Medicine, College of Pharmacy, Jinan University
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362
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Maikudi Usman M, Dadrasnia A, Tzin Lim K, Fahim Mahmud A, Ismail S. Application of biosurfactants in environmental biotechnology; remediation of oil and heavy metal. AIMS BIOENGINEERING 2016. [DOI: 10.3934/bioeng.2016.3.289] [Citation(s) in RCA: 60] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022] Open
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363
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Miranda AF, Biswas B, Ramkumar N, Singh R, Kumar J, James A, Roddick F, Lal B, Subudhi S, Bhaskar T, Mouradov A. Aquatic plant Azolla as the universal feedstock for biofuel production. BIOTECHNOLOGY FOR BIOFUELS 2016; 9:221. [PMID: 27777623 PMCID: PMC5069886 DOI: 10.1186/s13068-016-0628-5] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/01/2016] [Accepted: 09/28/2016] [Indexed: 05/06/2023]
Abstract
BACKGROUND The quest for sustainable production of renewable and cheap biofuels has triggered an intensive search for domestication of the next generation of bioenergy crops. Aquatic plants which can rapidly colonize wetlands are attracting attention because of their ability to grow in wastewaters and produce large amounts of biomass. Representatives of Azolla species are some of the fastest growing plants, producing substantial biomass when growing in contaminated water and natural ecosystems. Together with their evolutional symbiont, the cyanobacterium Anabaena azollae, Azolla biomass has a unique chemical composition accumulating in each leaf including three major types of bioenergy molecules: cellulose/hemicellulose, starch and lipids, resembling combinations of terrestrial bioenergy crops and microalgae. RESULTS The growth of Azolla filiculoides in synthetic wastewater led up to 25, 69, 24 and 40 % reduction of NH4-N, NO3-N, PO4-P and selenium, respectively, after 5 days of treatment. This led to a 2.6-fold reduction in toxicity of the treated wastewater to shrimps, common inhabitants of wetlands. Two Azolla species, Azolla filiculoides and Azolla pinnata, were used as feedstock for the production of a range of functional hydrocarbons through hydrothermal liquefaction, bio-hydrogen and bio-ethanol. Given the high annual productivity of Azolla, hydrothermal liquefaction can lead to the theoretical production of 20.2 t/ha-year of bio-oil and 48 t/ha-year of bio-char. The ethanol production from Azolla filiculoides, 11.7 × 103 L/ha-year, is close to that from corn stover (13.3 × 103 L/ha-year), but higher than from miscanthus (2.3 × 103 L/ha-year) and woody plants, such as willow (0.3 × 103 L/ha-year) and poplar (1.3 × 103 L/ha-year). With a high C/N ratio, fermentation of Azolla biomass generates 2.2 mol/mol glucose/xylose of hydrogen, making this species a competitive feedstock for hydrogen production compared with other bioenergy crops. CONCLUSIONS The high productivity, the ability to grow on wastewaters and unique chemical composition make Azolla species the most attractive, sustainable and universal feedstock for low cost, low energy demanding, near zero maintenance system for the production of a wide spectrum of renewable biofuels.
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Affiliation(s)
- Ana F. Miranda
- School of Sciences, RMIT University, Bundoora, VIC Australia
| | - Bijoy Biswas
- Thermo-Catalytic Processes Area (TPA), Bio-Fuels Division (BFD), CSIR-Indian Institute of Petroleum, Dehradun, Uttarakhand 248005 India
| | | | - Rawel Singh
- Thermo-Catalytic Processes Area (TPA), Bio-Fuels Division (BFD), CSIR-Indian Institute of Petroleum, Dehradun, Uttarakhand 248005 India
| | - Jitendra Kumar
- Thermo-Catalytic Processes Area (TPA), Bio-Fuels Division (BFD), CSIR-Indian Institute of Petroleum, Dehradun, Uttarakhand 248005 India
| | - Anton James
- School of Architecture and Design, RMIT University, Melbourne, Australia
| | | | - Banwari Lal
- The Energy and Resources Institute, New Delhi, 110 003 India
| | | | - Thallada Bhaskar
- Thermo-Catalytic Processes Area (TPA), Bio-Fuels Division (BFD), CSIR-Indian Institute of Petroleum, Dehradun, Uttarakhand 248005 India
| | - Aidyn Mouradov
- School of Sciences, RMIT University, Bundoora, VIC Australia
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364
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Frigaard NU. Biotechnology of Anoxygenic Phototrophic Bacteria. ADVANCES IN BIOCHEMICAL ENGINEERING/BIOTECHNOLOGY 2016; 156:139-154. [DOI: 10.1007/10_2015_5006] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/03/2022]
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365
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Mosa KA, Saadoun I, Kumar K, Helmy M, Dhankher OP. Potential Biotechnological Strategies for the Cleanup of Heavy Metals and Metalloids. FRONTIERS IN PLANT SCIENCE 2016; 7:303. [PMID: 27014323 PMCID: PMC4791364 DOI: 10.3389/fpls.2016.00303] [Citation(s) in RCA: 133] [Impact Index Per Article: 16.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/26/2015] [Accepted: 02/25/2016] [Indexed: 05/18/2023]
Abstract
Global mechanization, urbanization, and various natural processes have led to the increased release of toxic compounds into the biosphere. These hazardous toxic pollutants include a variety of organic and inorganic compounds, which pose a serious threat to the ecosystem. The contamination of soil and water are the major environmental concerns in the present scenario. This leads to a greater need for remediation of contaminated soils and water with suitable approaches and mechanisms. The conventional remediation of contaminated sites commonly involves the physical removal of contaminants, and their disposition. Physical remediation strategies are expensive, non-specific and often make the soil unsuitable for agriculture and other uses by disturbing the microenvironment. Owing to these concerns, there has been increased interest in eco-friendly and sustainable approaches such as bioremediation, phytoremediation and rhizoremediation for the cleanup of contaminated sites. This review lays particular emphasis on biotechnological approaches and strategies for heavy metal and metalloid containment removal from the environment, highlighting the advances and implications of bioremediation and phytoremediation as well as their utilization in cleaning-up toxic pollutants from contaminated environments.
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Affiliation(s)
- Kareem A. Mosa
- Department of Applied Biology, College of Sciences, University of SharjahSharjah, UAE
- Department of Biotechnology, Faculty of Agriculture, Al-Azhar UniversityCairo, Egypt
- *Correspondence: Kareem A. Mosa,
| | - Ismail Saadoun
- Department of Applied Biology, College of Sciences, University of SharjahSharjah, UAE
| | - Kundan Kumar
- Department of Biological Sciences, Birla Institute of Technology and Science Pilani, K. K. Birla Goa CampusGoa, India
| | - Mohamed Helmy
- The Donnelly Centre for Cellular and Biomedical Research, University of Toronto, TorontoON, Canada
| | - Om Parkash Dhankher
- Stockbridge School of Agriculture, University of MassachusettsAmherst, MA, USA
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366
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Copper-induced adaptation, oxidative stress and its tolerance in Aspergillus niger UCP1261. ELECTRON J BIOTECHN 2015. [DOI: 10.1016/j.ejbt.2015.09.006] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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367
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Aracic S, Manna S, Petrovski S, Wiltshire JL, Mann G, Franks AE. Innovative biological approaches for monitoring and improving water quality. Front Microbiol 2015; 6:826. [PMID: 26322034 PMCID: PMC4532924 DOI: 10.3389/fmicb.2015.00826] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2015] [Accepted: 07/27/2015] [Indexed: 12/20/2022] Open
Abstract
Water quality is largely influenced by the abundance and diversity of indigenous microbes present within an aquatic environment. Physical, chemical and biological contaminants from anthropogenic activities can accumulate in aquatic systems causing detrimental ecological consequences. Approaches exploiting microbial processes are now being utilized for the detection, and removal or reduction of contaminants. Contaminants can be identified and quantified in situ using microbial whole-cell biosensors, negating the need for water samples to be tested off-site. Similarly, the innate biodegradative processes can be enhanced through manipulation of the composition and/or function of the indigenous microbial communities present within the contaminated environments. Biological contaminants, such as detrimental/pathogenic bacteria, can be specifically targeted and reduced in number using bacteriophages. This mini-review discusses the potential application of whole-cell microbial biosensors for the detection of contaminants, the exploitation of microbial biodegradative processes for environmental restoration and the manipulation of microbial communities using phages.
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Affiliation(s)
- Sanja Aracic
- Applied and Environmental Microbiology Laboratory, Department of Physiology, Anatomy and Microbiology, La Trobe University , Melbourne, VIC, Australia
| | - Sam Manna
- Applied and Environmental Microbiology Laboratory, Department of Physiology, Anatomy and Microbiology, La Trobe University , Melbourne, VIC, Australia
| | - Steve Petrovski
- Applied and Environmental Microbiology Laboratory, Department of Physiology, Anatomy and Microbiology, La Trobe University , Melbourne, VIC, Australia
| | - Jennifer L Wiltshire
- Applied and Environmental Microbiology Laboratory, Department of Physiology, Anatomy and Microbiology, La Trobe University , Melbourne, VIC, Australia
| | - Gülay Mann
- Land Division, Defence Science and Technology Organisation , Melbourne, VIC, Australia
| | - Ashley E Franks
- Applied and Environmental Microbiology Laboratory, Department of Physiology, Anatomy and Microbiology, La Trobe University , Melbourne, VIC, Australia
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