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Bioremediation

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https://www.readbyqxmd.com/read/27922098/comparison-of-432-pseudomonas-strains-through-integration-of-genomic-functional-metabolic-and-expression-data
#1
Jasper J Koehorst, Jesse C J van Dam, Ruben G A van Heck, Edoardo Saccenti, Vitor A P Martins Dos Santos, Maria Suarez-Diez, Peter J Schaap
Pseudomonas is a highly versatile genus containing species that can be harmful to humans and plants while others are widely used for bioengineering and bioremediation. We analysed 432 sequenced Pseudomonas strains by integrating results from a large scale functional comparison using protein domains with data from six metabolic models, nearly a thousand transcriptome measurements and four large scale transposon mutagenesis experiments. Through heterogeneous data integration we linked gene essentiality, persistence and expression variability...
December 6, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27921289/slip-driven-electroosmotic-transport-through-porous-media
#2
Harshad Gaikwad, Pranab Kumar Mondal
We investigate the slip driven transport of a Newtonian fluid through porous media under electrical double layer effect. We employ a semi-analytical framework to obtain the underlying electro-hydrodynamics for different configurations of porous media. We bring out an alteration in flow dynamics, stemming from interplay among the geometrical feature of the models and the interfacial slip as modulated by the electrical forcing. Further, we show the consequent effects of the underlying flow dynamics on the volumetric transport rate through different models...
December 6, 2016: Electrophoresis
https://www.readbyqxmd.com/read/27918965/saponaria-officinalis-l-extract-surface-active-properties-and-impact-on-environmental-bacterial-strains
#3
Wojciech Smułek, Agata Zdarta, Amanda Pacholak, Agnieszka Zgoła-Grześkowiak, Łukasz Marczak, Maciej Jarzębski, Ewa Kaczorek
Plant-derived surfactants are characterised by low toxicity, high biodegradability and environmental compatibility. They therefore have many applications; for instance, they can be used in bioremediation to accelerate biodegradation processes, especially of hydrophobic pollutants. This paper analyses the properties of an extract from Saponaria officinalis L. containing saponins and its impact on bacterial strains isolated from soil, as well as its potential for application in hydrocarbon bioremediation. The tested extract from Saponaria officinalis L...
November 27, 2016: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/27917161/the-interaction-between-plants-and-bacteria-in-the-remediation-of-petroleum-hydrocarbons-an-environmental-perspective
#4
REVIEW
Panagiotis Gkorezis, Matteo Daghio, Andrea Franzetti, Jonathan D Van Hamme, Wouter Sillen, Jaco Vangronsveld
Widespread pollution of terrestrial ecosystems with petroleum hydrocarbons (PHCs) has generated a need for remediation and, given that many PHCs are biodegradable, bio- and phyto-remediation are often viable approaches for active and passive remediation. This review focuses on phytoremediation with particular interest on the interactions between and use of plant-associated bacteria to restore PHC polluted sites. Plant-associated bacteria include endophytic, phyllospheric, and rhizospheric bacteria, and cooperation between these bacteria and their host plants allows for greater plant survivability and treatment outcomes in contaminated sites...
2016: Frontiers in Microbiology
https://www.readbyqxmd.com/read/27917031/a-new-perspective-on-sustainable-soil-remediation-case-study-suggests-novel-fungal-genera-could-facilitate-in-situ-biodegradation-of-hazardous-contaminants
#5
L M Czaplicki, E Cooper, P L Ferguson, H M Stapleton, R Vilgalys, C K Gunsch
Deciding upon a cost effective and sustainable method to address soil pollution is a challenge for many remedial project managers. High pressure to quickly achieve cleanup goals pushes for energy-intensive remedies that rapidly address the contaminants of concern with established technologies, often leaving little room for research and development especially for slower treatment technologies, such as bioremediation, for the more heavily polluted sites. In the present case study, new genomic approaches have been leveraged to assess fungal biostimulation potential in soils polluted with particularly persistent hydrophobic contaminants...
2016: Remediation (N Y)
https://www.readbyqxmd.com/read/27916498/bioremediation-mechanisms-of-combined-pollution-of-pahs-and-heavy-metals-by-bacteria-and-fungi-a-mini-review
#6
REVIEW
Shao-Heng Liu, Guang-Ming Zeng, Qiu-Ya Niu, Yang Liu, Lu Zhou, Lu-Hua Jiang, Xiao-Fei Tan, Piao Xu, Chen Zhang, Min Cheng
In recent years, knowledge in regard to bioremediation of combined pollution of polycyclic aromatic hydrocarbons (PAHs) and heavy metals by bacteria and fungi has been widely developed. This paper reviews the species of bacteria and fungi which can tackle with various types of PAHs and heavy metals entering into environment simultaneously or successively. Microbial activity, pollutants bioavailability and environmental factors (e.g. pH, temperature, low molecular weight organic acids and humic acids) can all affect the bioremediation of PAHs and heavy metals...
November 25, 2016: Bioresource Technology
https://www.readbyqxmd.com/read/27915249/new-and-highly-active-microbial-phosphotriesterase-sources
#7
Julia Y Santillan, Lucas A Dettorre, Elizabeth S Lewkowicz, Adolfo M Iribarren
Many toxic insecticides used worldwide as well as some chemical warfare agents are phosphotriester derivatives. Therefore, detoxification of organophosphorus compounds has become the subject of many studies and in particular bioremediation, based on the phosphotriesterase catalysed hydrolysis of these compounds, has shown to be an effective and ecological methodology. In order to identify new bacterial phosphotriesterases, a simple and sensitive fluorimetric screening method on solid media was employed, that allowed the selection of 6 strains with phosphotriesterase activity...
December 2, 2016: FEMS Microbiology Letters
https://www.readbyqxmd.com/read/27914353/two-liquid-phase-system-a-promising-technique-for-predicting-bioavailability-of-polycyclic-aromatic-hydrocarbons-in-long-term-contaminated-soils
#8
Congying Wang, Ziyu Wang, Zengbo Li, Riaz Ahmad
A two-liquid-phase system (TLPS), which consisted of soil slurry and silicone oil, was employed to extract polycyclic aromatic hydrocarbons (PAHs) in four long-term contaminated soils in order to assess the bioavailability of PAHs. Extraction kinetics of six PAHs viz. phenanthrene, fluoranthene, pyrene, benzo(a)anthracene, benzo(a)pyrene, dibenzo(a,h)anthrancene were selected to investigate as they covered the susceptible and recalcitrant PAHs in soil. A parallel experiments were also carried out on the microbial degradation of these PAHs in soil with and without biostimulation (by adding (NH4)2HPO4)...
November 30, 2016: Chemosphere
https://www.readbyqxmd.com/read/27913419/benzene-degradation-by-variovorax-sp-within-a-coal-tar-contaminated-groundwater-microbial-community
#9
Kevin M Posman, Christopher M DeRito, Eugene L Madsen
: Investigations of environmental microbial communities are crucial for the discovery of populations capable of degrading hazardous compounds and may lead to improved bioremediation strategies. The goal of this study was to identify microorganisms responsible for aerobic benzene degradation in coal-tar contaminated groundwater. Benzene degradation was monitored in laboratory incubations of well waters using gas chromatography mass spectrometry (GC/MS). Stable isotope probing (SIP) experiments using (13)C-benzene allowed us to obtain (13)C-labled community DNA; from this, 16S rRNA clone libraries identified γ- and β-Proteobacteria as the active benzene metabolizing microbial populations...
December 2, 2016: Applied and Environmental Microbiology
https://www.readbyqxmd.com/read/27912189/genotoxicity-assessment-of-pulp-and-paper-mill-effluent-before-and-after-bacterial-degradation-using-allium-cepa-test
#10
Izharul Haq, Sharad Kumar, Abhay Raj, Mohtashim Lohani, G N V Satyanarayana
A lignin peroxidases-producing Serratia liquefaciens was used for bioremediation of pulp and paper (P&P) mill effluent. The treatment led to reduction of chemical oxygen demand (COD), colour, lignin and phenolic content by 84%, 72%, 61% and 95%, respectively. The effluent detoxification was studied by genotoxicity assays using Allium cepa L. (onion) root tip cells. Genotoxicity studies included measuring mitotic index (MI), chromosomal aberrations (CA) and nuclear abnormalities (NA) in root tip cells following treatment with 25, 50, 75 and 100% (v/v) of effluent...
November 29, 2016: Chemosphere
https://www.readbyqxmd.com/read/27912137/a-novel-continuous-two-phase-partitioning-bioreactor-operated-with-polymeric-tubing-performance-validation-for-enhanced-biological-removal-of-toxic-substrates
#11
M Concetta Tomei, Domenica Mosca Angelucci, Andrew J Daugulis
A continuous two-phase partitioning bioreactor (C-TPPB), operated with coiled tubing made of the DuPont polymer Hytrel 8206, was tested for the bioremediation of 4-chlorophenol, as a model toxic compound. The tubing was immersed in the aqueous phase, with the contaminated water flowing tube-side, and an adapted microbial culture suspended in the bioreactor itself, with the metabolic demand of the cells creating a concentration gradient to cause the substrate to diffuse into the bioreactor for biodegradation...
November 29, 2016: Journal of Environmental Management
https://www.readbyqxmd.com/read/27907245/biodegradation-of-the-aminopolyphosphonate-dtpmp-by-the-cyanobacterium-anabaena-variabilis-proceeds-via-a-c-p-lyase-independent-pathway
#12
Damian Drzyzga, Giuseppe Forlani, Jochen Vermander, Paweł Kafarski, Jacek Lipok
Cyanobacteria, the only prokaryotes capable of oxygenic photosynthesis, play a major role in carbon, nitrogen and phosphorus global cycling. Under conditions of increased P availability and nutrient loading, some cyanobacteria are capable of blooming, rapidly multiplying and possibly altering the ecological structure of the ecosystem. Because of their ability of using non-conventional P sources, these microalgae can be used for bioremediation purposes. Under this perspective, the metabolization of the polyphosphonate diethylenetriaminepenta(methylenephosphonic) acid (DTPMP) by the strain CCALA 007 of Anabaena variabilis was investigated using (31) P NMR analysis...
December 1, 2016: Environmental Microbiology
https://www.readbyqxmd.com/read/27905924/current-knowledge-and-perspectives-of-paenibacillus-a-review
#13
REVIEW
Elliot Nicholas Grady, Jacqueline MacDonald, Linda Liu, Alex Richman, Ze-Chun Yuan
Isolated from a wide range of sources, the genus Paenibacillus comprises bacterial species relevant to humans, animals, plants, and the environment. Many Paenibacillus species can promote crop growth directly via biological nitrogen fixation, phosphate solubilization, production of the phytohormone indole-3-acetic acid (IAA), and release of siderophores that enable iron acquisition. They can also offer protection against insect herbivores and phytopathogens, including bacteria, fungi, nematodes, and viruses...
December 1, 2016: Microbial Cell Factories
https://www.readbyqxmd.com/read/27905820/evidence-based-validation-of-quorum-quenching-from-lysinibacillus-sphaericus-and-geobacillus-sp-in-bioremediation-of-oil-sludge
#14
Camilo Gómez-Garzón, Jenny Dussán
Many studies on quorum quenching focus on the discovery and characterization of novel acyl-homoserine lactonases (AHL-lactonases) because these enzymes could be used in the control of diseases caused by Gram-negative bacteria. The effects of quorum quenching are also remarkable in the performance of bacterial consortia in applications such as bioremediation. In the current work, we demonstrated the presence of a potential novel AHL-lactonase-encoding locus (Bsph_3377) from Lysinibacillus sphaericus and Geobacillus sp...
September 1, 2016: Canadian Journal of Microbiology
https://www.readbyqxmd.com/read/27903429/polyhydroxyalkanoate-as-a-slow-release-carbon-source-for-in-situ-bioremediation-of-contaminated-aquifers-from-laboratory-investigation-to-pilot-scale-testing-in-the-field
#15
Lucia Pierro, Bruna Matturro, Simona Rossetti, Marco Sagliaschi, Salvatore Sucato, Eduard Alesi, Ernst Bartsch, Firoozeh Arjmand, Marco Petrangeli Papini
A pilot-scale study aiming to evaluate the potential use of poly-3-hydroxy-butyrate (PHB) as an electron donor source for in situ bioremediation of chlorinated hydrocarbons in groundwater was conducted. Compared with commercially available electron donors, PHB offers a restricted fermentation pathway (i.e., through acetic acid and molecular hydrogen) by avoiding the formation of any residual carbon that could potentially spoil groundwater quality. The pilot study was carried out at an industrial site in Italy, heavily contaminated by different chlorinated aliphatic hydrocarbons (CAHs)...
November 27, 2016: New Biotechnology
https://www.readbyqxmd.com/read/27902405/microbial-nanowires-an-electrifying-tale
#16
Sandeep K Sure, Leigh M Ackland, Angel A Torriero, Alok Adholeya, Mandira Kochar
Electromicrobiology has gained momentum in the last ten years with advances in microbial fuel cells and the discovery of microbial nanowires (MNWs). The list of MNWs producing microorganisms is growing and providing intriguing insights into the presence of such microorganisms in diverse environments and the potential roles MNWs can perform. This review discusses the MNWs produced by different microorganisms, including their structure, composition and role in electron transfer through MNWs. Two hypotheses, metallic-like conductivity and an electron hopping model, have been proposed for electron transfer and we present a current understanding of both these hypotheses...
October 21, 2016: Microbiology
https://www.readbyqxmd.com/read/27900695/function-based-metagenomic-library-screening-and-heterologous-expression-strategy-for-genes-encoding-phosphatase-activity
#17
Genis A Castillo Villamizar, Heiko Nacke, Rolf Daniel
The release of phosphate from inorganic and organic phosphorus compounds can be mediated enzymatically. Phosphate-releasing enzymes, comprising acid and alkaline phosphatases, are recognized as useful biocatalysts in applications such as plant and animal nutrition, bioremediation and diagnostic analysis. Metagenomic approaches provide access to novel phosphatase-encoding genes. Here, we describe a function-based screening approach for rapid identification of genes conferring phosphatase activity from small-insert and large-insert metagenomic libraries derived from various environments...
2017: Methods in Molecular Biology
https://www.readbyqxmd.com/read/27896685/the-interactions-of-vanadate-monomer-with-the-mycelium-of-fungus-phycomyces-blakesleeanus-reduction-or-uptake
#18
Mirzeta Hadžibrahimović, Desanka Sužnjević, Ferenc Pastor, Tijana Cvetić Antić, Milan Žižić, Joanna Zakrzewska, Miroslav Živić
The possibility of reduction of vanadate monomer in the mycelium of fungus Phycomyces blakesleeanus was investigated in this study by means of polarography. Control experiments were performed with vanadyl [V(IV)] and vanadate [V(V)] in 10 mM Hepes, pH 7.2. Addition of P. blakesleeanus mycelium resulted in disappearance of all V(IV) polarographic waves recorded in the control. This points to the uptake of all available V(IV) by the mycelium, up to 185 µmol/gFW, and suggests P. blakesleeanus as a potential agent in V(IV) bioremediation...
November 28, 2016: Antonie Van Leeuwenhoek
https://www.readbyqxmd.com/read/27894756/bioremediation-of-long-term-pcb-contaminated-soil-by-white-rot-fungi
#19
Tatiana Stella, Stefano Covino, Monika Čvančarová, Alena Filipová, Maurizio Petruccioli, Alessandro D'Annibale, Tomáš Cajthaml
The objective of this work was to test the PCB-degrading abilities of two white-rot fungi, namely Pleurotus ostreatus and Irpex lacteus, in real contaminated soils with different chemical properties and autochthonous microflora. In addition to the efficiency in PCB removal, attention was given to other important parameters, such as changes in the toxicity and formation of PCB transformation products. Moreover, structural shifts and dynamics of both bacterial and fungal communities were monitored using next-generation sequencing and phospholipid fatty acid analysis...
November 17, 2016: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/27890585/cadmium-in%C3%A2-vivo-exposure-alters-stress-response-and-endocrine-related-genes-in-the-freshwater-snail-physa-acuta-new-biomarker-genes-in-a-new-model-organism
#20
Pedro Martínez-Paz, Mónica Morales, Paloma Sánchez-Argüello, Gloria Morcillo, José Luis Martínez-Guitarte
The freshwater snail Physa acuta is a sensitive organism to xenobiotics that is appropriate for toxicity testing. Cadmium (Cd) is a heavy metal with known toxic effects on several organisms, which include endocrine disruption and activation of the cellular stress responses. There is scarce genomic information on P. acuta; hence, in this work, we identify several genes related to the hormonal system, the stress response and the detoxification system to evaluate the effects of Cd. The transcriptional activity of the endocrine-related genes oestrogen receptor (ER), oestrogen-related receptor (ERR), and retinoid X receptor (RXR), the heat shock proteins genes hsp70 and hsp90 and a metallothionein (MT) gene was analysed in P...
January 2017: Environmental Pollution
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