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Biodegradation

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https://www.readbyqxmd.com/read/30003496/evaluating-the-mycostimulation-potential-of-select-carbon-amendments-for-the-degradation-of-a-model-pah-by-an-ascomycete-strain-enriched-from-a-superfund-site
#1
Lauren M Czaplicki, Monika Dharia, Ellen M Cooper, P Lee Ferguson, Claudia K Gunsch
Although ecological flexibility has been well documented in fungi, it remains unclear how this flexibility can be exploited for pollutant degradation, especially in the Ascomycota phylum. In this work, we assess three mycostimulation amendments for their ability to induce degradation in Trichoderma harzanium, a model fungus previously isolated from a Superfund site contaminated with polycyclic aromatic hydrocarbons. The amendments used in the present study were selected based on the documented ecological roles of ascomycetes...
July 13, 2018: Biodegradation
https://www.readbyqxmd.com/read/29971690/special-issue-bioremediation-of-contaminated-soil-and-water-geotrop-2017
#2
EDITORIAL
Yiu Fai Tsang, Yong Sik Ok, Ajit K Sarmah, Bin Cao, Ming Hung Wong
No abstract text is available yet for this article.
July 3, 2018: Biodegradation
https://www.readbyqxmd.com/read/29943215/adsorptive-removal-of-harmful-algal-species-microcystis-aeruginosa-directly-from-aqueous-solution-using-polyethylenimine-coated-polysulfone-biomass-composite-fiber
#3
Sok Kim, Min Seo Jeon, Jee Young Kim, Sang Jun Sim, Jong-Soon Choi, Joseph Kwon, Yoon-E Choi
In recent times, the treatment of harmful algal blooms (HABs) became an important environmental issue to preserve and remediate water resources globally. In the present study, the adsorptive removal of harmful algal species Microcystis aeruginosa directly from an aqueous medium was attempted. Waste biomass (Escherichia coli) was immobilized using polysulfone and coated using the cationic polymer polyethylenimine (PEI) to generate PEI-coated polysulfone-biomass composite fiber (PEI-PSBF). The density of M. aeruginosa in an aqueous medium (BG11) was significantly decreased by treatment with PEI-PSBF...
June 25, 2018: Biodegradation
https://www.readbyqxmd.com/read/29916096/anaerobic-biotransformation-of-hexachlorocyclohexane-isomers-by-dehalococcoides-species-and-an-enrichment-culture
#4
Safdar Bashir, Kevin Kuntze, Carsten Vogt, Ivonne Nijenhuis
The biotransformation of hexachlorocyclohexane isomers (HCH) by two Dehalococcoides mccartyi strains (195 and BTF08) and an enrichment culture was investigated and compared to conversion by the obligate anaerobic strain Clostridium pasteurianum strain DSMZ 525. The D. mccartyi strains preferentially transformed γ-HCH over α-HCH and δ-HCH isomers while β-HCH biotransformation was not significant. In case of the enrichment culture, γ-HCH was preferentially transformed over the δ-HCH, β-HCH and α-HCH isomers...
June 18, 2018: Biodegradation
https://www.readbyqxmd.com/read/29948519/aerobic-bacteria-degrading-both-n-alkanes-and-aromatic-hydrocarbons-an-undervalued-strategy-for-metabolic-diversity-and-flexibility
#5
REVIEW
Joanna Brzeszcz, Paweł Kaszycki
Environmental pollution with petroleum toxic products has afflicted various ecosystems, causing devastating damage to natural habitats with serious economic implications. Some crude oil components may serve as growth substrates for microorganisms. A number of bacterial strains reveal metabolic capacities to biotransform various organic compounds. Some of the hydrocarbon degraders are highly biochemically specialized, while the others display a versatile metabolism and can utilize both saturated aliphatic and aromatic hydrocarbons...
June 13, 2018: Biodegradation
https://www.readbyqxmd.com/read/29948518/anaerobic-ammonium-oxidation-linked-to-sulfate-and-ferric-iron-reduction-fuels-nitrogen-loss-in-marine-sediments
#6
E Emilia Rios-Del Toro, Edgardo I Valenzuela, Nguyen E López-Lozano, M Guadalupe Cortés-Martínez, Miguel A Sánchez-Rodríguez, Omar Calvario-Martínez, Salvador Sánchez-Carrillo, Francisco J Cervantes
Availability of fixed nitrogen is a pivotal driver on primary productivity in the oceans, thus the identification of key processes triggering nitrogen losses from these ecosystems is of major importance as they affect ecosystems function and consequently global biogeochemical cycles. Denitrification and anaerobic ammonium oxidation coupled to nitrite reduction (Anammox) are the only identified marine sinks for fixed nitrogen. The present study provides evidence indicating that anaerobic ammonium oxidation coupled to the reduction of sulfate, the most abundant electron acceptor present in the oceans, prevails in marine sediments...
June 11, 2018: Biodegradation
https://www.readbyqxmd.com/read/29855740/the-effect-and-biological-mechanism-of-granular-sludge-size-on-performance-of-autotrophic-nitrogen-removal-system
#7
Xing Ya-Juan, Ji Jun-Yuan, Zheng Ping, Wang Lan, Ghulam Abbas, Jiqiang Zhang, Wang Ru, He Zhan-Fei
The autotrophic process for nitrogen removal has attracted worldwide attention in the field of wastewater treatment, and the performance of this process is greatly influenced by the size of granular sludge particles present in the system. In this work, the granular sludge was divided into three groups, i.e. large size (> 1.2 mm), medium size (0.6-1.2 mm) and small size (< 0.6 mm). The medium granular sludge was observed to dominate at high volumetric nitrogen loading rates, while offering strong support for good performance...
May 31, 2018: Biodegradation
https://www.readbyqxmd.com/read/29789975/exploring-potential-applications-of-a-novel-extracellular-polymeric-substance-synthesizing-bacterium-bacillus-licheniformis-isolated-from-gut-contents-of-earthworm-metaphire-posthuma-in-environmental-remediation
#8
Jayanta Kumar Biswas, Anurupa Banerjee, Mahendra Kumar Rai, Jörg Rinklebe, Sabry M Shaheen, Santosh Kumar Sarkar, Madhab Chandra Dash, Anilava Kaviraj, Uwe Langer, Hocheol Song, Meththika Vithanage, Monojit Mondal, Nabeel Khan Niazi
The aim was to isolate, characterize, and explore potentials of gut bacteria from the earthworm (Metaphire posthuma) and imply these bacteria for remediation of Cu(II) and Zn(II). An extracellular polymeric substance (EPS) producing gut bacteria (Bacillus licheniformis strain KX657843) was isolated and identified based on 16S rRNA sequencing and phylogenetic analysis. The strain showed maximum tolerance of 8 and 6 mM for Cu(II) and Zn(II) respectively. It removed 34.5% of Cu(II) and 54.4% of Zn(II) at 25 mg L-1 after 72 and 96 h incubation respectively...
May 22, 2018: Biodegradation
https://www.readbyqxmd.com/read/29785468/competition-for-electrons-between-mono-oxygenations-of-pyridine-and-2-hydroxypyridine
#9
Chao Yang, Yingxia Tang, Hua Xu, Ning Yan, Naiyu Li, Yongming Zhang, Bruce E Rittmann
Pyridine and its heterocyclic derivatives are widely encountered in industrial wastewaters, and they are relatively recalcitrant to biodegradation. Pyridine biodegradation is initiated by two mono-oxygenation reactions that compete for intracellular electron donor (2H). In our experiments, UV photolysis of pyridine generated succinate, whose oxidation augmented the intracellular electron donor and accelerated pyridine biodegradation and mineralization. The first mono-oxygenation reaction always was faster than the second one, because electrons provided by intracellular electron donors were preferentially utilized by the first mono-oxygenase; this was true even when the concentration of 2HP was greater than the concentration of pyridine...
May 21, 2018: Biodegradation
https://www.readbyqxmd.com/read/29725781/application-of-a-low-cost-biosurfactant-in-heavy-metal-remediation-processes
#10
Rivaldo B da Rocha Junior, Hugo M Meira, Darne G Almeida, Raquel D Rufino, Juliana M Luna, Valdemir A Santos, Leonie A Sarubbo
The industrial interest in microbial surfactants has intensified in recent years due to the characteristics of these compounds, such as biodegradability, low toxicity, and effectiveness in removing heavy metals and hydrophobic organic compounds from soil and water. This paper describes the production of a biosurfactant by the yeast Candida tropicalis grown in distilled water with 2.5% molasses, 2.5% frying oil and 4% corn steep liquor. The production of the biosurfactant reached 27 g/l in a 50-l bioreactor with a surface tension of 30 mN/m...
May 4, 2018: Biodegradation
https://www.readbyqxmd.com/read/29725780/production-formulation-and-cost-estimation-of-a-commercial-biosurfactant
#11
Rita de Cássia Freire Soares da Silva, Darne Germano de Almeida, Pedro Pinto Ferreira Brasileiro, Raquel Diniz Rufino, Juliana Moura de Luna, Leonie Asfora Sarubbo
Due to their amphipathic nature, biosurfactants are multifunctional molecules that have considerable potential in several industries, especially the petroleum industry. In this study, the commercial production of a biosurfactant from Pseudomonas cepacia CCT6659 grown on industrial waste was investigated in a semi-industrial 50-L bioreactor for use in the removal of hydrocarbons from oily effluents. A concentration of 40.5 g/L was achieved in the scale up and the surface tension was reduced to 29 mN/m. The biosurfactant was formulated with an added preservative, tyndallization and the combination of fluent vaporization plus the preservative...
May 3, 2018: Biodegradation
https://www.readbyqxmd.com/read/29696449/1-4-dioxane-degradation-characteristics-of-rhodococcus-aetherivorans-jcm-14343
#12
Daisuke Inoue, Tsubasa Tsunoda, Norifumi Yamamoto, Michihiko Ike, Kazunari Sei
Rhodococcus aetherivorans JCM 14343 can degrade 1,4-dioxane as a sole carbon and energy source. This study aimed to characterize this 1,4-dioxane degradation ability further, and assess the potential use of the strain for 1,4-dioxane removal in industrial wastewater. Strain JCM 14343 was able to degrade 1,4-dioxane inducibly, and its 1,4-dioxane degradation was also induced by tetrahydrofuran and 1,4-butanediol. The demonstration that 1,4-butanediol not only induced but also enhanced 1,4-dioxane degradation was a novel finding of this study...
June 2018: Biodegradation
https://www.readbyqxmd.com/read/29637426/kinetics-study-of-nicosulfuron-degradation-by-a-pseudomonas-nitroreducens-strain-nsa02
#13
Haoyu Zhao, Jianyi Zhu, Shengnan Liu, Xiaogang Zhou
A bacterial strain NSA02, isolated from contaminated soil and identified as Pseudomonas nitroreducens based on partial 16S rDNA gene sequence analysis and BIOLOG microbiology analysis, was used to study biodegradation of nicosulfuron in the culture medium. The optimal degradation conditions were determined to be 30 °C and pH 7.0. Batch tests were performed for seven different initial substrate concentrations to observe substrate degradation and associated cell growth. The biodegradation kinetics was found to follow a first-order model with regression values greater than 0...
June 2018: Biodegradation
https://www.readbyqxmd.com/read/29627868/nitrogen-removal-performance-and-microbial-community-of-an-enhanced-multistage-a-o-biofilm-reactor-treating-low-strength-domestic-wastewater
#14
Han Chen, Ang Li, Qiao Wang, Di Cui, Chongwei Cui, Fang Ma
The low-strength domestic wastewater (LSDW) treatment with low chemical oxygen demand (COD) has drawn extensive attention for the poor total nitrogen (TN) removal performance. In the present study, an enhanced multistage anoxic/oxic (A/O) biofilm reactor was designed to improve the TN removal performance of the LSDW treatment. Efficient nitrifying and denitrifying biofilm carriers were cultivated and then filled into the enhanced biofilm reactor as the sole microbial source. Step-feed strategy and internal recycle were adopted to optimize the substrate distribution and the organics utilization...
June 2018: Biodegradation
https://www.readbyqxmd.com/read/29603052/biodegradation-of-pentafluorosulfanyl-substituted-aminophenol-in-pseudomonas-spp
#15
Marta Saccomanno, Sabir Hussain, Neil K O'Connor, Petr Beier, Mate Somlyay, Robert Konrat, Cormac D Murphy
The pentafluorosulfanyl (SF5 -) substituent conveys properties that are beneficial to drugs and agrochemicals. As synthetic methodologies improve the number of compounds containing this group will expand and these chemicals may be viewed as emerging pollutants. As many microorganisms can degrade aromatic xenobiotics, we investigated the catabolism of SF5 -substituted aminophenols by bacteria and found that some Pseudomonas spp. can utilise these compounds as sole carbon and energy sources. GC-MS analysis of the culture supernatants from cultures grown in 5-(pentafluorosulfanyl) 2-aminophenol demonstrated the presence of the N-acetylated derivative of the starting substrate and 4-(pentafluorosulfanyl)catechol...
June 2018: Biodegradation
https://www.readbyqxmd.com/read/29546497/improvement-of-sulfamethoxazole-smx-elimination-and-inhibition-of-formations-of-hydroxylamine-smx-and-n4-acetyl-smx-by-membrane-bioreactor-systems
#16
Min-Hui Tang, Nan Gao, Jiao Zhou, Yan Zhao, Jing-Sheng Cheng, Wen-Kun Su, Ying-Jin Yuan
Sulfamethoxazole (SMX) has frequently been detected in aquatic environments. In natural environment, not only individual microorganism but also microbial consortia are involved in some biotransformation of pollutants. The competition for space under consortia causing cell-cell contact inhibition changes the cellular behaviors. Herein, the membrane bioreactor system (MBRS) was applied to improve SMX elimination thorough exchanging the cell-free broths (CFB). The removal efficiency of SMX was increased by more than 24% whether under the pure culture of A...
June 2018: Biodegradation
https://www.readbyqxmd.com/read/29502248/anaerobic-biodegradation-of-partially-hydrolyzed-polyacrylamide-in-long-term-methanogenic-enrichment-cultures-from-production-water-of-oil-reservoirs
#17
Hao Hu, Jin-Feng Liu, Cai-Yun Li, Shi-Zhong Yang, Ji-Dong Gu, Bo-Zhong Mu
The increasing usage of partially hydrolyzed polyacrylamide (HPAM) in oilfields as a flooding agent to enhance oil recovery at so large quantities is an ecological hazard to the subsurface ecosystem due to persistence and inertness. Biodegradation of HPAM is a potentially promising strategy for dealing with this problem among many other methods available. To understand the responsible microorganisms and mechanism of HPAM biodegradation under anaerobic conditions, an enrichment culture from production waters of oil reservoirs were established with HPAM as the sole source of carbon and nitrogen incubated for over 328 days, and analyzed using both molecular microbiology and chemical characterization methods...
June 2018: Biodegradation
https://www.readbyqxmd.com/read/29492777/contaminant-concentration-versus-flow-velocity-drivers-of-biodegradation-and-microbial-growth-in-groundwater-model-systems
#18
Michael Grösbacher, Dominik Eckert, Olaf A Cirpka, Christian Griebler
Aromatic hydrocarbons belong to the most abundant contaminants in groundwater systems. They can serve as carbon and energy source for a multitude of indigenous microorganisms. Predictions of contaminant biodegradation and microbial growth in contaminated aquifers are often vague because the parameters of microbial activity in the mathematical models used for predictions are typically derived from batch experiments, which don't represent conditions in the field. In order to improve our understanding of key drivers of natural attenuation and the accuracy of predictive models, we conducted comparative experiments in batch and sediment flow-through systems with varying concentrations of contaminant in the inflow and flow velocities applying the aerobic Pseudomonas putida strain F1 and the denitrifying Aromatoleum aromaticum strain EbN1...
June 2018: Biodegradation
https://www.readbyqxmd.com/read/29663166/anthelmintic-efficacy-of-glycolipid-biosurfactant-produced-by-pseudomonas-plecoglossicida-an-insight-from-mutant-and-transgenic-forms-of-caenorhabditis-elegans
#19
Sabarinathan Devaraj, Mohankumar Amirthalingam, Poorna Chandrika Sabapathy, Shanmugam Govindan, Sundararaj Palanisamy, Preethi Kathirvel
The current research focuses on the production and characterization of glycolipid biosurfactant (GB) from Pseudomonas plecoglossicida and its anthelmintic activity against Caenorhabditis elegans. The GB was purified and characterized by Fourier Transform Infrared Spectroscopy (FTIR) and Gas Chromatography and Mass Spectrometry (GC-MS) analysis. Anthelmintic activity of GB was studied at six different pharmacological doses from 10 to 320 µg/mL on C. elegans. Exposure of different developmental stages (L1, L2, L3, L4 and adult) of C...
April 16, 2018: Biodegradation
https://www.readbyqxmd.com/read/29492776/modulation-of-microbial-consortia-enriched-from-different-polluted-environments-during-petroleum-biodegradation
#20
Rahma Omrani, Giulia Spini, Edoardo Puglisi, Dalila Saidane
Environmental microbial communities are key players in the bioremediation of hydrocarbon pollutants. Here we assessed changes in bacterial abundance and diversity during the degradation of Tunisian Zarzatine oil by four indigenous bacterial consortia enriched from a petroleum station soil, a refinery reservoir soil, a harbor sediment and seawater. The four consortia were found to efficiently degrade up to 92.0% of total petroleum hydrocarbons after 2 months of incubation. Illumina 16S rRNA gene sequencing revealed that the consortia enriched from soil and sediments were dominated by species belonging to Pseudomonas and Acinetobacter genera, while in the seawater-derived consortia Dietzia, Fusobacterium and Mycoplana emerged as dominant genera...
April 2018: Biodegradation
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