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https://www.readbyqxmd.com/read/28815413/biosurfactants-during-in-situ-bioremediation-factors-that-influence-the-production-and-challenges-in-evalution
#1
Andressa Decesaro, Thaís Strieder Machado, Ângela Carolina Cappellaro, Christian Oliveira Reinehr, Antônio Thomé, Luciane Maria Colla
Research on the influence of biosurfactants on the efficiency of in situ bioremediation of contaminated soil is continuously growing. Despite the constant progress in understanding the mechanisms involved in the effects of biosurfactants, there are still many factors that are not sufficiently elucidated. There is a lack of research on autochthonous or exogenous microbial metabolism when biostimulation or bioaugmentation is carried out to produce biosurfactants at contaminated sites. In addition, studies on the application of techniques that measure the biosurfactants produced in situ are needed...
August 16, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28814712/secondary-compound-hypothesis-revisited-selected-plant-secondary-metabolites-promote-bacterial-degradation-of-cis-1-2-dichloroethylene-cdce
#2
Serena Fraraccio, Michal Strejcek, Iva Dolinova, Tomas Macek, Ondrej Uhlik
Cis-1,2-dichloroethylene (cDCE), which is a common hazardous compound, often accumulates during incomplete reductive dechlorination of higher chlorinated ethenes (CEs) at contaminated sites. Simple monoaromatics, such as toluene and phenol, have been proven to induce biotransformation of cDCE in microbial communities incapable of cDCE degradation in the absence of other carbon sources. The goal of this microcosm-based laboratory study was to discover non-toxic natural monoaromatic secondary plant metabolites (SPMEs) that could enhance cDCE degradation in a similar manner to toluene and phenol...
August 16, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28814284/effect-of-poly-hexamethylene-biguanide-hydrochloride-phmb-treated-non-sterile-medical-gloves-upon-the-transmission-of-streptococcus-pyogenes-carbapenem-resistant-e-coli-mrsa-and-klebsiella-pneumoniae-from-contact-surfaces
#3
S Ali, A P R Wilson
BACKGROUND: Reduction of accidental contamination of the near-patient environment has potential to reduce acquisition of healthcare-associated infection(s). Although medical gloves should be removed when soiled or touching the environment, compliance is variable. The use of antimicrobial-impregnated medical gloves could reduce the horizontal-transfer of bacterial contamination between surfaces. AIM: Determine the activity of antimicrobial-impregnated gloves against common hospital pathogens: Streptococcus pyogenes, carbapenem-resistant E...
August 17, 2017: BMC Infectious Diseases
https://www.readbyqxmd.com/read/28813695/risk-based-remediation-of-polluted-sites-a-critical-perspective
#4
REVIEW
Saranya Kuppusamy, Kadiyala Venkateswarlu, Mallavarapu Megharaj, Srinithi Mayilswami, Yong Bok Lee
Sites contaminated with chemical pollutants represent a growing challenge, and remediation of such lands is of international concern. Risk-based land management (RBLM) is an emerging approach that integrates risk assessment practices with more traditional site-specific investigations and remediation activities. Developing countries are yet to adopt RBLM strategies for remediation. RBLM is considered to be practical, scientifically defensible and cost-efficient. However, it is inherently limited by: firstly, the accuracy of risk assessment models used; secondly, ramifications of the fact that they are more likely to leave contamination in place; and thirdly, uncertainties involved and having to consider the total concentrations of all contaminants in soils that overestimate the potential risks from exposure to the contaminants...
August 9, 2017: Chemosphere
https://www.readbyqxmd.com/read/28811510/temporal-changes-in-the-radiocesium-distribution-in-forests-over-the-five-years-after-the-fukushima-daiichi-nuclear-power-plant-accident
#5
Naohiro Imamura, Masabumi Komatsu, Shinta Ohashi, Shoji Hashimoto, Takuya Kajimoto, Shinji Kaneko, Tsutomu Takano
To elucidate the temporal changes in the radiocesium distribution in forests contaminated by the Fukushima Daiichi Nuclear Power Plant accident, we monitored the (137)Cs concentration and inventory within forests from 2011 to 2015 across nine plots containing variable tree species and different contamination levels. The (137)Cs concentrations in needles and branches decreased exponentially at all coniferous plots, with effective ecological half-lives of 0.45-1.55 yr for needles and 0.83-1.69 yr for branches...
August 15, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28810221/new-naphthalene-whole-cell-bioreporter-for-measuring-and-assessing-naphthalene-in-polycyclic-aromatic-hydrocarbons-contaminated-site
#6
Yujiao Sun, Xiaohui Zhao, Dayi Zhang, Aizhong Ding, Cheng Chen, Wei E Huang, Huichun Zhang
A new naphthalene bioreporter was designed and constructed in this work. A new vector, pWH1274_Nah, was constructed by the Gibson isothermal assembly fused with a 9 kb naphthalene-degrading gene nahAD (nahAa nahAb nahAc nahAd nahB nahF nahC nahQ nahE nahD) and cloned into Acinetobacter ADPWH_lux as the host, capable of responding to salicylate (the central metabolite of naphthalene). The ADPWH_Nah bioreporter could effectively metabolize naphthalene and evaluate the naphthalene in natural water and soil samples...
August 7, 2017: Chemosphere
https://www.readbyqxmd.com/read/28809955/biodegradation-of-diuron-by-an-endophytic-fungus-neurospora-intermedia-dp8-1-isolated-from-sugarcane-and-its-potential-for-remediating-diuron-contaminated-soils
#7
Yanhui Wang, Honghong Li, Guojun Feng, Liangwei Du, Dongqiang Zeng
A diuron-degrading endophyte DP8-1 was isolated from sugarcane root grown in diuron-treated soil in the present study. The endophyte was identified as Neurospora intermedia based on the morphological characteristics and sequence analysis. The fermentation parameters including temperature, pH, inoculation size, carbon source, and initial diuron concentration were also investigated for the optimization of degradation efficiency. The results indicated that strain DP8-1 was capable of degrading up to 99% diuron within 3 days under the optimal degrading condition...
2017: PloS One
https://www.readbyqxmd.com/read/28809507/persistence-of-indigenous-escherichia-coli-in-raw-bovine-manure-amended-soil
#8
Samantha K Çekiç, Jaysankar De, Mohammad Jubair, Keith R Schneider
The Food Safety Modernization Act attempts to reduce produce-related foodborne illness by using preventive rather than reactive measures. The goal of this research was to determine the persistence of manure-borne generic Escherichia coli under laboratory and field conditions. The population density of naturally occurring E. coli was ∼7.2 and 5.4 log CFU/10 g in pre- and postscreened manures, respectively. Postscreened (i.e. after the liquid manure has passed through a screen) manure was applied at light, medium, and heavy rates to fields in Live Oak and Citra, FL, during the fall and summer...
September 2017: Journal of Food Protection
https://www.readbyqxmd.com/read/28808815/physiological-responses-and-antioxidant-enzyme-changes-in-sulla-coronaria-inoculated-by-cadmium-resistant-bacteria
#9
Manel Chiboub, Salwa Harzalli Jebara, Omar Saadani, Imen Challougui Fatnassi, Souhir Abdelkerim, Moez Jebara
Plant growth promoting bacteria (PGPB) may help to reduce the toxicity of heavy metals on plants growing in polluted soils. In this work, Sulla coronaria inoculated with four Cd resistant bacteria (two Pseudomonas spp. and two Rhizobium sullae) were cultivated in hydroponic conditions treated by Cd; long time treatment 50 µM CdCl2 for 30 days and short time treatment; 100 µM CdCl2 for 7 days. Results showed that inoculation with Cd resistant PGPB enhanced plant biomass, thus shoot and root dry weights of control plants were enhanced by 148 and 35% respectively after 7 days...
August 14, 2017: Journal of Plant Research
https://www.readbyqxmd.com/read/28808325/phytoremediation-potential-of-acorus-calamus-in-soils-co-contaminated-with-cadmium-and-polycyclic-aromatic-hydrocarbons
#10
Nasreen Jeelani, Wen Yang, Lingqian Xu, Yajun Qiao, Shuqing An, Xin Leng
Phytoremediation is a promising technology for the remediation of sites co-contaminated with inorganic (heavy metal) and organic pollutants. A greenhouse experiment was conducted to investigate the independent and interactive effects of cadmium (Cd) and polycyclic aromatic hydrocarbons (PAHs) on the growth of the wetland plant Acorus calamus and its ability to uptake, accumulate, and remove pollutants from soils. Our results showed that growth and biomass of A. calamus were significantly influenced by the interaction of Cd and PAHs after 60 days of growth...
August 14, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28806672/a-novel-approach-for-rapidly-and-cost-effectively-assessing-toxicity-of-toxic-metals-in-acidic-water-using-an-acidophilic-iron-oxidizing-biosensor
#11
Shih-Hung Yang, Kuo-Chih Cheng, Vivian Hsiu-Chuan Liao
Contamination by heavy metals and metalloids is a serious environmental and health concern. Acidic wastewaters are often associated with toxic metals which may enter and spread into agricultural soils. Several biological assays have been developed to detect toxic metals; however, most of them can only detect toxic metals in a neutral pH, not in an acidic environment. In this study, an acidophilic iron-oxidizing bacterium (IOB) Strain Y10 was isolated, characterized, and used to detect toxic metals toxicity in acidic water at pH 2...
August 6, 2017: Chemosphere
https://www.readbyqxmd.com/read/28806652/applicability-of-alkaline-precipitation-for-the-recovery-of-edds-spent-solution
#12
Marco Race
This paper presents an innovative procedure for the recovery of SS-ethylenediamine-N,N'-disuccinic acid (EDDS) solution used for soil washing processes. The procedure is derived from that applied for the recovery of ethylenediamine-tetraacetic acid (EDTA), modifying and optimizing the choice of the chemical agents used for the protonation of the chelant, the exchange of the metals, and the final precipitation of the unwanted compounds. To select the reagents and test the proposed approach, an experimental study was conducted on real EDDS spent solutions, obtained washing a Cu and Zn real contaminated soil...
August 11, 2017: Journal of Environmental Management
https://www.readbyqxmd.com/read/28806555/environmental-and-socio-economic-sustainability-appraisal-of-contaminated-land-remediation-strategies-a-case-study-at-a-mega-site-in-china
#13
Yinan Song, Deyi Hou, Junli Zhang, David O'Connor, Guanghe Li, Qingbao Gu, Shupeng Li, Peng Liu
Green and sustainable remediation (GSR) has become a global trend in the contaminated land remediation field. Growing numbers of countries have adopted GSR procedures published in regulatory and/or technical guidance. China is fast becoming one of the largest remediation markets in the world, and is beginning to engage with GSR. Among other efforts, a taskforce is currently developing the first Chinese technical standard on GSR. This paper presents the context positioning and development of a sustainable remediation assessment indicator set for China...
August 11, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28806553/thiacloprid-adsorption-and-leaching-in-soil-effect-of-the-composition-of-irrigation-solutions
#14
José Antonio Rodríguez-Liébana, M Dolores Mingorance, Aránzazu Peña
Pressure on groundwater resources has increased during the last decades due to the growing demand, especially in arid and semiarid regions, such as the Mediterranean basin, with frequent drought periods. In order to partially remediate this environmental problem of world concern, irrigation of agricultural lands with adequately treated wastewaters (TWW) is becoming a common management practice. The complex composition of these low-quality waters may influence the behavior of organic contaminants in soils. A calcareous soil with low organic carbon content was selected for the assessment of the adsorption and leaching of the neonicotinoid insecticide thiacloprid (THC)...
August 11, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28804810/assessing-the-phytoavailability-of-arsenic-and-phosphorus-to-corn-plant-after-the-addition-of-an-acrylic-copolymer-to-polluted-soils
#15
Tahereh Mansouri, Ahmad Golchin, Hossein Kouhestani
Soil pollution by arsenic increases the potential risk of arsenic entrance into the food chain. The usefulness of maleic anhydride- styrene- acrylic acid copolymer on the mobility and phytoavailability of arsenic was evaluated. Treatments were the concentrations of acrylic copolymer (0, 0.05, 0.10, and 0.20% w/w) and the concentrations of soil total arsenic (0, 6, 12, 24, 48, and 96 mg kg(-1)). Sodium arsenate was added in appropriate amounts to subsamples of an uncontaminated soil to give contaminated soils with different levels of arsenic...
August 13, 2017: Environmental Monitoring and Assessment
https://www.readbyqxmd.com/read/28803424/nitrate-pollution-in-the-warta-river-poland-between-1958-and-2016-trends-and-causes
#16
Józef Górski, Krzysztof Dragon, Piotr Michał Jan Kaczmarek
The article presents analyses of long-term water quality data from the Warta River between 1958 and 2016. A clear increasing trend in nitrate concentrations was observed from 1958 to the early 1990s. This trend was mainly related to the increasing use of fertilizers in Poland in this period. Then, after the early 1990s, a slow decreasing trend related to improvements in water and sewage management and more rational fertilizer use was observed after political and economic changes in Poland. The influence of long-term hydrological droughts on nitrate concentrations was also investigated...
August 12, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28803381/effect-of-soil-ph-and-organic-matter-on-the-adsorption-and-desorption-of-pentachlorophenol
#17
Shui-Wen Chang Chien, Shou-Hung Chen, Chi-Jui Li
Various properties of soil affect the partition of organic contaminants within, and conversely, the properties of the organic contaminants also directly affect their partition behavior in soil. Therefore, understanding the effects of various properties of soil on the partition of organic contaminants favors subsequent assessment and provides soil remediation methods for policymakers. This study selected pentachlorophenol (PCP), a common hydrophobic ionizable organic compound in contaminated sites worldwide, as the target contaminant...
August 12, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28803337/production-of-rhamnolipids-by-semi-solid-state-fermentation-with-pseudomonas-aeruginosa-rg18-for-heavy-metal-desorption
#18
Jianrong Wu, Jingbo Zhang, Panpan Wang, Li Zhu, Minjie Gao, Zhiyong Zheng, Xiaobei Zhan
Foaming problem and cost of substrate limit the commercial application of rhamnolipids, a potential biosurfactant produced by Pseudomonas aeruginosa. We explored the production of rhamnolipids by a semi-solid-state (SSS) fermentation strategy with glycerol as carbon source and rapeseed/wheat bran as matrix, along with the capacity of the produced rhamnolipids to solubilize lead and cadmium in aqueous solution. Structural analysis by MALDI-TOF MS indicated the increased proportion of mono-rhamnolipids from SSS fermentation...
August 12, 2017: Bioprocess and Biosystems Engineering
https://www.readbyqxmd.com/read/28803155/assisted-phytoremediation-of-a-multi-contaminated-soil-investigation-on-arsenic-and-lead-combined-mobilization-and-removal
#19
Meri Barbafieri, Francesca Pedron, Gianniantonio Petruzzelli, Irene Rosellini, Elisabetta Franchi, Roberto Bagatin, Marco Vocciante
The removal of contaminants from an earthy matrix by phytoremediation requires the selection of appropriate plant species and a suitable strategy to be effective. In order to set up an assisted phytoremediation intervention related to a disused industrial site affected by an arsenic and lead complex contamination, an extensive experimental investigation on micro and mesocosm scale has been conducted. Particular attention was given to the choice of plant species: using crop plants (Lupinus albus, Helianthus annuus and Brassica juncea) a series of parallel test campaigns have been realized to investigate different scenarios for the reclamation...
August 10, 2017: Journal of Environmental Management
https://www.readbyqxmd.com/read/28803149/concentrations-of-polycyclic-aromatic-hydrocarbons-and-trace-elements-in-arctic-soils-a-case-study-in-svalbard
#20
Montse Marquès, Jordi Sierra, Tatiana Drotikova, Montse Mari, Martí Nadal, José L Domingo
A combined assessment on the levels and distribution profiles of polycyclic aromatic hydrocarbons (PAHs) and trace elements in soils from Pyramiden (Central Spitsbergen, Svalbard Archipelago) is here reported. As previously stated, long-range atmospheric transport, coal deposits and previous mining extractions, as well as the stack emissions of two operative power plants at this settlement are considered as potential sources of pollution. Eight top-layer soil samples were collected and analysed for the 16 US EPA priority PAHs and for 15 trace elements (As, Be, Cd, Co, Cr, Cu, Hg, Mn, Mo, Ni, Pb, Sn, Tl, V and Zn) during late summer of 2014...
August 10, 2017: Environmental Research
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