journal
MENU ▼
Read by QxMD icon Read
search

Biodegradation

journal
https://www.readbyqxmd.com/read/29725781/application-of-a-low-cost-biosurfactant-in-heavy-metal-remediation-processes
#1
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
#2
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
#3
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...
April 25, 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
#4
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/29637426/kinetics-study-of-nicosulfuron-degradation-by-a-pseudomonas-nitroreducens-strain-nsa02
#5
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...
April 10, 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
#6
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...
April 7, 2018: Biodegradation
https://www.readbyqxmd.com/read/29603052/biodegradation-of-pentafluorosulfanyl-substituted-aminophenol-in-pseudomonas-spp
#7
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...
March 30, 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
#8
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...
March 15, 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
#9
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
#10
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/29492776/modulation-of-microbial-consortia-enriched-from-different-polluted-environments-during-petroleum-biodegradation
#11
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
https://www.readbyqxmd.com/read/29450665/biochemical-pathways-and-enhanced-degradation-of-di-n-octyl-phthalate-dop-in-sequencing-batch-reactor-sbr-by-arthrobacter-sp-slg-4-and-rhodococcus-sp-slg-6-isolated-from-activated-sludge
#12
Ke Zhang, Yihao Liu, Qiang Chen, Hongbing Luo, Zhanyuan Zhu, Wei Chen, Jia Chen, You Mo
Two bacterial strains designated as Arthrobacter sp. SLG-4 and Rhodococcus sp. SLG-6, capable of utilizing di-n-octyl phthalate (DOP) as sole source of carbon and energy, were isolated from activated sludge. The analysis of DOP degradation intermediates indicated Arthrobacter sp. SLG-4 could completely degrade DOP. Whereas DOP could not be mineralized by Rhodococcus sp. SLG-6 and the final metabolic product was phthalic acid (PA). The proposed DOP degradation pathway by Arthrobacter sp. SLG-4 was that strain SLG-4 initially transformed DOP to PA via de-esterification pathway, and then PA was metabolized to protocatechuate acid and eventually converted to tricarboxylic acid (TCA) cycle through meta-cleavage pathway...
April 2018: Biodegradation
https://www.readbyqxmd.com/read/29397457/biodegradation-of-n-alkanes-on-oil-seawater-interfaces-at-different-temperatures-and-microbial-communities-associated-with-the-degradation
#13
Synnøve Lofthus, Roman Netzer, Anna S Lewin, Tonje M B Heggeset, Tone Haugen, Odd Gunnar Brakstad
Oil biodegradation studies have mainly focused on microbial processes in dispersions, not specifically on the interfaces between the oil and the seawater in the dispersions. In this study, a hydrophobic adsorbent system, consisting of Fluortex fabrics, was used to investigate biodegradation of n-alkanes and microbial communities on oil-seawater interfaces in natural non-amended seawater. The study was performed over a temperature range from 0 to 20 °C, to determine how temperature affected biodegradation at the oil-seawater interfaces...
April 2018: Biodegradation
https://www.readbyqxmd.com/read/29383556/simultaneous-nitrification-and-denitrification-with-different-mixed-nitrogen-loads-by-a-hypothermia-aerobic-bacterium
#14
Tengxia He, Zhenlun Li, Deti Xie, Quan Sun, Yi Xu, Qing Ye, Jiupai Ni
Microorganism with simultaneous nitrification and denitrification ability plays a significant role in nitrogen removal process, especially in the eutrophic waters with excessive nitrogen loads. The nitrogen removal capacity of microorganism may suffer from low temperature or nitrite nitrogen source. In this study, a hypothermia aerobic nitrite-denitrifying bacterium, Pseudomonas tolaasii strain Y-11, was selected to determine the simultaneous nitrification and denitrification ability with mixed nitrogen source at 15 °C...
April 2018: Biodegradation
https://www.readbyqxmd.com/read/29302823/biodegradation-of-sulfonamides-by-shewanella-oneidensis-mr-1-and-shewanella-sp-strain-mr-4
#15
Fei Mao, Xiaohong Liu, Kang Wu, Chen Zhou, Youbin Si
Because of extensive sulfonamides application in aquaculture and animal husbandry and the consequent increase in sulfonamides discharged into the environment, strategies to remediate sulfonamide-contaminated environments are essential. In this study, the resistance of Shewanella oneidensis MR-1 and Shewanella sp. strain MR-4 to the sulfonamides sulfapyridine (SPY) and sulfamethoxazole (SMX) were determined, and sulfonamides degradation by these strains was assessed. Shewanella oneidensis MR-1 and Shewanella sp...
April 2018: Biodegradation
https://www.readbyqxmd.com/read/29285669/identification-of-metolachlor-mineralizing-bacteria-in-aerobic-and-anaerobic-soils-using-dna-stable-isotope-probing
#16
Ramdas G Kanissery, Allana Welsh, Andres Gomez, Lynn Connor, Gerald K Sims
The influence of soil environmental factors such as aeration on the ecology of microorganisms involved in the mineralization and degradation of the popular soil-applied pre-emergent herbicide, metolachlor is unknown. To address this knowledge gap, we utilized DNA-based stable isotope probing (SIP) where soil microcosms were incubated aerobically or anaerobically and received herbicide treatments with unlabeled metolachlor or13 C-metolachlor. Mineralization of metolachlor was confirmed as noted from the evolution of14 CO2 from14 C-metolachlor-treated microcosms and clearly demonstrated the efficient utilization of the herbicide as a carbon source...
April 2018: Biodegradation
https://www.readbyqxmd.com/read/29236193/ammonium-removal-using-algae-bacteria-consortia-the-effect-of-ammonium-concentration-algae-biomass-and-light
#17
Huijun Jia, Qiuyan Yuan
In this study, the effects of ammonium nitrogen concentration, algae biomass concentration, and light conditions (wavelength and intensity) on the ammonium removal efficiency of algae-bacteria consortia from wastewater were investigated. The results indicated that ammonium concentration and light intensity had a significant impact on nitrification. It was found that the highest ammonia concentration (430 mg N/L) in the influent resulted in the highest ammonia removal rate of 108 ± 3.6 mg N/L/days, which was two times higher than the influent with low ammonia concentration (40 mg N/L)...
April 2018: Biodegradation
https://www.readbyqxmd.com/read/29224124/underestimated-effects-of-sediments-on-enhanced-startup-performance-of-biofilm-systems-for-polluted-source-water-pretreatment
#18
Zheng-Hui Lv, Jing Wang, Guang-Feng Yang, Li-Juan Feng, Jun Mu, Liang Zhu, Xiang-Yang Xu
In order to evaluate the enhancement mechanisms of enhanced startup performance in biofilm systems for polluted source water pretreatment, three lab-scale reactors with elastic stereo media (ESM) were operated under different enhanced sediment and hydraulic agitation conditions. It is interesting to found the previously underestimated or overlooked effects of sediment on the enhancement of pollutants removal performance and enrichment of functional bacteria in biofilm systems. The maximum NH4 + -N removal rate of 0...
February 2018: Biodegradation
https://www.readbyqxmd.com/read/29177812/anaerobic-degradation-of-1-methylnaphthalene-by-a-member-of-the-thermoanaerobacteraceae-contained-in-an-iron-reducing-enrichment-culture
#19
Sviatlana Marozava, Housna Mouttaki, Hubert Müller, Nidal Abu Laban, Alexander J Probst, Rainer U Meckenstock
An anaerobic culture (1MN) was enriched with 1-methylnaphthalene as sole source of carbon and electrons and Fe(OH)3 as electron acceptor. 1-Naphthoic acid was produced as a metabolite during growth with 1-methylnaphthalene while 2-naphthoic acid was detected with naphthalene and 2-methylnaphthalene. This indicates that the degradation pathway of 1-methylnaphthalene might differ from naphthalene and 2-methylnaphthalene degradation in sulfate reducers. Terminal restriction fragment length polymorphism and pyrosequencing revealed that the culture is mainly composed of two bacteria related to uncultured Gram-positive Thermoanaerobacteraceae and uncultured gram-negative Desulfobulbaceae...
February 2018: Biodegradation
https://www.readbyqxmd.com/read/29143903/whole-community-transcriptome-of-a-sequencing-batch-reactor-transforming-2-4-dinitroanisole-dnan-and-3-nitro-1-2-4-triazol-5-one-nto
#20
Jennifer Weidhaas, Alexander Panaccione, Ananda Shankar Bhattacharjee, Ramesh Goel, Angela Anderson, Saraswati Poudel Acharya
Two sequencing batch reactors (SBRs) were run to bio-mineralize 2,4-dinitroanisole (DNAN) and 3-nitro-1,2,4-triazol-5-one (NTO) in lab scale settings. The reactors were shown to reproducibly biotransform these munitions under aerobic and anaerobic conditions during the operations of these SBRs. Complete removal (100% biotransformation) of DNAN (initially 17.7 ± 5.4 mg L-1 ) and NTO (initially 15.0 ± 7.1 mg L-1 ) was observed in an anaerobic SBR when Luria-Bertani (LB) broth was present. In contrast, an aerobic SBR degraded only 58 ± 22% of DNAN (initially 19...
February 2018: Biodegradation
journal
journal
30612
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"