This three-day symposium was organized by the US EPA, the USAF AL/EQ, Tyndall AFB FL, and the US AFCEE Technology Transfer Division, Brooks AFB TX. Natural attenuation, the biodegradation or chemical destruction or stabilization of contaminants, can reduce contaminants to levels protective of human health and ecosystems. The symposium was intended to increase understanding of the natural attenuation process and to review methods for screening sites and making decisions to determine the feasibility of natural attenuation at chlorinated solvent-contaminated sites. The symposium obtained feedback from the regulatory and industrial communities on the appropriate application of natural attenuation and the developing protocol for natural attenuation of chlorinated organics. The symposium featured invited platform presentations covering both laboratory studies and field demonstrations conducted in support of natural attenuation at government and industry sites. The theory and principles of methods for
Abstract. The sinks of hydrocarbons in the atmosphere are usually described by oxidation reactions in the gas and aqueous (cloud) phases. Previous lab studies suggest that in addition to chemical processes, biodegradation by bacteria might also contribute to the loss of organics in clouds; however, due to the lack of comprehensive data sets on such biodegradation processes, they are not commonly included in atmospheric models. In the current study, we measured the biodegradation rates of phenol and catechol, which are known pollutants, by one of the most active strains selected during our previous screening in clouds (Rhodococcus enclensis). For catechol, biodegradation transformation is about ten times faster than for phenol. The experimentally derived biodegradation rates are included in a multiphase box model to compare the chemical loss rates of phenol and catechol in both the gas and aqueous phases to their biodegradation rate in the aqueous phase under atmospheric conditions. Model results ...
Detail záznamu - Chapter 11: Biodegradation of Aromatic Pollutants by Ligninolytic Fungal Strains - Detail záznamu - Knihovna Akademie věd České republiky
Video created by Rice University for the course Natural Attenuation of Groundwater Contaminants: New Paradigms, Technologies, and Applications. In this series of lectures, we will learn when biodegradation can or cannot occur and what ...
An additional benefit of hydrogen peroxide and Fentons Reagent is the temporary increase of oxygen levels in and around the treatment area. The increased oxygen levels at the fringes of the treatment area can enhance naturally occurring aerobic biodegradation processes that reduce contaminant mass. While there may be concerns about oxidizing hydrocarbon-degrading bacteria in the chemical oxidation treatment area, many studies have shown that soil cannot be readily sterilized by Fentons Reagent and that microbial populations rapidly rebound following chemical oxidation treatment. ...
The increasing sensitivity of PCR has meant that in the last two decades PCR has emerged as a major tool in diet studies, enabling us to refine our understanding of trophic links and to elucidate the diets of predators whose prey is as yet uncharacterized. The achievements and methods of PCR-based diet studies have been reviewed several times, but here we review an important development in the field: the use of PCR enrichment techniques to promote the amplification of prey DNA over that of the predator. We first discuss the success of using group-specific primers either in parallel single reactions or in multiplex reactions. We then concentrate on the more recent use of PCR enrichment techniques such as restriction enzyme digests, peptide nucleic acid clamping, DNA blocking and laser capture microdissection. We also survey the vast literature on enrichment techniques in clinical biology, to ascertain the pitfalls of enrichment techniques and what refinements have yielded some highly sensitive ...
Dichloromethane (DCM) is a toxic pollutant showing prolonged persistence in water. So far, biodegradation of DCM has only been reported in soils and freshwater systems. Herein, we studied whether or not biodegradation of DCM could occur in estuarine waters. Results showed over 90% mineralization of DCM in natural estuarine waters supplemented with DCM. Biodegradation of DCM in estuarine waters occurred by association of different bacterial species. Generally, two bacterial species participated in DCM degradation. Two bacterial consortia were obtained. Consortia were able to degrade around 80% of DCM in about 6 days. The species involved in the process were identified by 16S rRNA gene sequencing; a consortium was constituted by Pseudomonas sp. and Brevundimonas sp. and a second consortium was formed by Pseudomonas sp. and an Acinetobacter sp. Our results showed that DCM can be readily biodegraded in estuarine waters ...
This patent search tool allows you not only to search the PCT database of about 2 million International Applications but also the worldwide patent collections. This search facility features: flexible search syntax; automatic word stemming and relevance ranking; as well as graphical results.
... (ECRTs) use a proprietary AC/DC electrical signal to mineralize organic compounds (e.g. volatile organic compounds (VOCs)), and to mobilize and remove metal contaminants. Proprietary AC/DC converters produce a low-voltage, low-amperage electrical field that polarizes the soil or sediment (soil), causing soil particles to charge and discharge electricity. This causes redox reactions that occur at all interfaces within the soil-groundwater-contaminant-electrode system, mineralizing organics and increasing the mobilization of metals. Metals migrate to the electrodes where they are deposited and removed with the electrodes. There are several distinctions between ECRTs and traditional electrokinetics. First, relatively low energy input is required to perform remediation. Second, ECRTs generally are effective within months, instead of years, and they can be performed in-situ or ex-situ. Third, metals generally migrate to and deposit at both electrodes, unlike ...
... (ECRTs) use a proprietary AC/DC electrical signal to mineralize organic compounds (e.g. volatile organic compounds (VOCs)), and to mobilize and remove metal contaminants. Proprietary AC/DC converters produce a low-voltage, low-amperage electrical field that polarizes the soil or sediment (soil), causing soil particles to charge and discharge electricity. This causes redox reactions that occur at all interfaces within the soil-groundwater-contaminant-electrode system, mineralizing organics and increasing the mobilization of metals. Metals migrate to the electrodes where they are deposited and removed with the electrodes. There are several distinctions between ECRTs and traditional electrokinetics. First, relatively low energy input is required to perform remediation. Second, ECRTs generally are effective within months, instead of years, and they can be performed in-situ or ex-situ. Third, metals generally migrate to and deposit at both electrodes, unlike ...
Cascade has both the expertise and chemical remediation technology for a wide range of options including in situ chemical oxidation and bioremediation.
Get this from a library! Environmental monitoring and remediation technologies II : 20-22 September, 1999, Boston, Massachusetts. [Tuan Vo-Dinh; Robert L Spellicy; Society of Photo-optical Instrumentation Engineers.; Air & Waste Management Association. Optical Sciences Division.; SPIE Digital Library.;]
NUTRIPLEX® is a probiotic formulation of complexing systems, organic acids, nutrients, natural biological systems, buffers, and energy systems which enhances biological degradation. It provides nutrients and energy to support probiotic bioremediation systems.. ...
Biodegradation definition, to decay and become absorbed by the environment: toys that will biodegrade when theyre discarded. See more.
PubMed journal article Organic Contaminant Biodegradation by Oxidoreductase Enzymes in Wastewater Treatmen were found in PRIME PubMed. Download Prime PubMed App to iPhone or iPad.
Fellow Environmental Scientist/Engineer, GZA GeoEnvironmental, Inc. (GZA) is hosting a bioremediation discussion group (BioGroup) on the Internet. The BioGroup consists of an unmoderated mailing list serving over 900 members worldwide. The BioGroup was established to provide a global forum for the scientific and engineering community to discuss intrinsic/enhanced bioremediation topics. GZA hopes this forum provides a medium to transfer technology, standardize biotreatability protocols, and advance the science and engineering of bioremediation technologies. GZA expects the forum to be a springboard for the pursuit of innovative approaches to bioremediation engineering. Because the success of the BioGroup is a function of the participation of its members, GZA invites anyone with experience and/or interest in bioremediation to join the BioGroup. Due to the complexities of biogeochemical processes which control contaminant biotransformation, we welcome input from environmental engineers, ...
Fellow Environmental Scientist/Engineer, GZA GeoEnvironmental, Inc. (GZA) is hosting a bioremediation discussion group (BioGroup) on the Internet. The BioGroup consists of an unmoderated mailing list serving over 800 members worldwide. The BioGroup was established to provide a global forum for the scientific and engineering community to discuss intrinsic/enhanced bioremediation topics. GZA hopes this forum provides a medium to transfer technology, standardize biotreatability protocols, and advance the science and engineering of bioremediation technologies. GZA expects the forum to be a springboard for the pursuit of innovative approaches to bioremediation engineering. Because the success of the BioGroup is a function of the participation of its members, GZA invites anyone with experience and/or interest in bioremediation to join the BioGroup. Due to the complexities of biogeochemical processes which control contaminant biotransformation, we welcome input from environmental engineers, ...
Introduction. Membrane bioreactors (MBR) combine a biological degradation process with the direct separation of activated sludge and liquid-solid by filtration membranes [1]. In addition, MBRs have important advantages such as space reduction relative to conventional activated sludge process, which leads to a decrease in their environmental impact, the capability of operating with higher concentrations of suspended solids, and the production of better quality effluent. However, one of the main drawbacks of MBR is membrane fouling. Despite the high cost of commonly used ceramic membranes (made of alumina, zirconia or titania), it is known that they are more hydrophilic than polymeric membranes, which means that ceramic membranes have a lower membrane fouling rate. Ceramic membranes are also more chemically, mechanically and thermally resistant. Other characteristics that influence membrane fouling are pore size and configuration (tubular, flat or hollow fiber) [2,3]. Currently, polymeric hollow ...
This chapter discusses the aspects of bioremediation that are related to metabolism of recalcitrant chemicals by bacteria, leaving out also detoxification and immobilization of metal ions and metalloids. The most frequent types of sites amenable to bioremediation include soil, freshwater, seawater, and sediments. The chapter talks about the instances where recalcitrant and/or xenobiotic compounds are endowed with chemical properties that cause a deleterious effect on the catalytic microorganisms present in the site-regardless of whether they can be ultimately metabolized. The chemicals at stake include metals, chaotropic agents, aromatics, and hydrophobic compounds. These stressors can be grouped based on their effect on bacterial metabolism. Heat shock-like stress and oxidative damage are certainly the two more prevalent conditions endured by environmental bacteria during in situ biodegradation of chemical waste. This is true for singular stressors as well as for mixtures of them, the most frequent
Contaminated Land: Applications in Real Environments (CL:AIRE) is a respected independent not-for-profit organisation established in 1999 to stimulate the regeneration of contaminated land in the UK by raising awareness of, and confidence in, practical and sustainable remediation technologies. Since 1999, CL:AIRE has grown into an organisation that does more than just demonstrate remediation technologies
Contaminated Land: Applications in Real Environments (CL:AIRE) is a respected independent not-for-profit organisation established in 1999 to stimulate the regeneration of contaminated land in the UK by raising awareness of, and confidence in, practical and sustainable remediation technologies. Since 1999, CL:AIRE has grown into an organisation that does more than just demonstrate remediation technologies
Terpeneliteracy.com is a multi-platform publisher of news and information. Terpeneliteracy.com has earned a reputation as the leading provider of Terpene news and information that improves the quality of life of its readers by focusing on Terpene issues ...
I am a dedicated PhD with expertise in the field environmental science. The last 10 years of my work has been focused on improving soil and water remediation technologies either by using plants or bacteria to remove organic contaminants and heavy metals from contaminated sites. More specifically, I have worked on removing oil droplet from produced water discharged by oil platforms, reducing the risk associated with organics contaminants by biodegradation and sequestration in the soil, and removing heavy metals in contaminated soil by using plants (phytoremediation). I have managed research projects, planned and carried out experimental assays, managed and analysed large data sets. I have gained good results with peer-reviewed articles and scientific reports plus given presentations at several international conferences. With my masters in environmental science I have a wide interdisciplinary knowledge of biological, physical and chemical processes and I collaborate well across scientific fields ...
Sturm, B., Cheng., Y., Lane, R., Adams, C., Carter, R. (2011) "Impact of sludge residence time on the relative biodegradation and biosorption of sulfonamide antibiotics in activated sludge," ACS 241st National Meeting, Anaheim, CA (March 2011).. ...
Article Enhanced Bioremediation of Chlorinated Solvents (PDF). Enhanced in situ bioremediation of chlorinated solvents in groundwater has been successfully demonstrated at many sites by supplying lactic acid as an electron donor. The source of lactat...
A study was carried out on biodegradation of soil contaminated with used motor oil in aerobic fixed bed bioreactors. Six treatments, labeled TR1 to TR6, were investigated..
The survival of the inoculated microbial culture is critical for successful bioaugmentation but impossible to predict precisely. As an alternative strategy, bioaugmentation of a group of...
Researchers based at Princeton University found that Earths terrestrial ecosystems have absorbed 186 billion to 192 billion tons of carbon since the mid-20th century, which has significantly contained the global temperature and levels of carbon in the atmosphere.
Article The Use of Hydrogen Release Compound (HRC) for CAH Bioremediation.. Hydrogen Release Compound (HRC™) is a simple, passive, low-cost and long-term option for the anaerobic bioremediation of chlorinated aliphatic hydrocarbons (CAHs) via a reduc...
The experts at EAG Laboratories conduct comprehensive environmental fate testing to determine a substances metabolism rate and identify metabolites.
Reactome is pathway database which provides intuitive bioinformatics tools for the visualisation, interpretation and analysis of pathway knowledge.
Reactome is pathway database which provides intuitive bioinformatics tools for the visualisation, interpretation and analysis of pathway knowledge.
Technology News and Trends (TNT) A newsletter about soil, sediment, and groundwater characterization and remediation technologies
Technology News and Trends (TNT) A newsletter about soil, sediment, and groundwater characterization and remediation technologies
6. kinfit/(g)mkin: fit chemical degradation - kinfit and mkin are implementations of the kinetic models and evaluation procedures recommended by in the final report of the FOCUS work group on degradation kinetics first published in 2006. gmkin provides a graphical user interface to mkin ...
Sigma-Aldrich offers abstracts and full-text articles by [Jelena M Spasojević, Snežana P Maletić, Srđan D Rončević, Dragan V Radnović, Dragana I Cučak, Jelena S Tričković, Božo D Dalmacija].
ROOT!T Propagator Refill Sponges are a breakthrough in organic technology. They are made from a mixture of peat and bark bonded together with plant-derived biodegradable polymers that allow the plug to biodegrade. Natural Rooting sponges are specially designed to improve cutting strike rate.
My company, BioGreen Products Co., offers oxo-biodegradable plastic preforms and caps. These are made with conventional PET, and cannot be distinguished from conventional PET by looking at them. They are not PLA, aka spudware or starch based plastics, and are not similar to PAL. Our preforms are crystal clear, and have all of the properties of conventional PET except for the multi-century lifespan. Our bottles start to biodegrade after their two year shelf life, under the same conditions
U of T engineering professor Elizabeth Edwards is internationally recognized for using biotechnology to clean up industrial solvents in soil and groundwater.
1998 (English)In: Aquatic Microbial Ecology, ISSN 0948-3055, E-ISSN 1616-1564, Vol. 14, no 3, 301-307 p.Article in journal (Refereed) Published ...
It does not depend on the initial concentration of the daughter element being zero. How do we know the ages of fossils and fossil-bearing rocks?...
Addresses a Global Challenge to Sustainable Development. Advances in Biodegradation and Bioremediation of Industrial Waste examines and compiles the latest information on the industrial waste biodegradation process and provides a comprehensive review. Dedicated to reducing pollutants generated by agriculturally contaminated soil, and plastic waste from various industries, this text is a book that begs the question: Is a pollution-free environment possible? The book combines with current available data with the expert knowledge of specialists from around the world to evaluate various aspects of environmental microbiology and biotechnology. It emphasizes the role of different bioreactors for the treatment of complex industrial waste and provides specific chapters on bioreactors and membrane process integrated with biodegradation process. It also places special emphasis on phytoremediation and the role of wetland plant rhizosphere bacterial ecology and the bioremediation of complex industrial ...
Motivation: Current methods for the prediction of biodegradation products and pathways of organic environmental pollutants either do not take into account domain knowledge or do not provide probability estimates. In this article, we propose a hybrid knowledge- and machine learning-based approach to overcome these limitations in the context of the University of Minnesota Pathway Prediction System (UM-PPS). The proposed solution performs relative reasoning in a machine learning framework, and obtains one probability estimate for each biotransformation rule of the system. As the application of a rule then depends on a threshold for the probability estimate, the trade-off between recall (sensitivity) and precision (selectivity) can be addressed and leveraged in practice.. Results: Results from leave-one-out cross-validation show that a recall and precision of ∼0.8 can be achieved for a subset of 13 transformation rules. Therefore, it is possible to optimize precision without compromising recall. ...
The intrinsic biodegradability of hydrocarbons and the distribution of proficient degrading microorganisms in the environment are very crucial for the implementation of bioremediation practices. Among others, one of the most favorable methods that can enhance the effectiveness of bioremediation of hydrocarbon-contaminated environment is the application of biosurfactant producing microbes. In the present study, the biodegradation capacities of native bacterial consortia towards total petroleum hydrocarbons (TPH) with special emphasis to poly aromatic hydrocarbons (PAHs) were determined. The purpose of the study was to isolate TPH degrading bacterial strains from various petroleum contaminated soil of Assam, India and develop a robust bacterial consortium for bioremediation of crude oil of this native land. From a total of 23 bacterial isolates obtained from three different hydrocarbons contaminated samples 5 isolates, namely KS2, PG1, PG5, R1 and R2 were selected as efficient crude oil degraders with
Previously... Re: [SANET-MG] Beneficial Soil Microbia] The question is how to get information on IM or IMOs, Indigenous Microorganisms. Well, there is a seminar on Indigenous Microorganisms at the Ecological Farming Conference in California, Jan. 22-25. Gil Carandang, a farmer from the Phillipines, will demonstrate some of the special cultures. http://www.eco-farm.org/efc/efc_main.html Concepts and practices on Indigenous Microorganisms, IM or IMO, originate with Han Kyu Cho and the Korean Natural Farming Association, or KNFA, going back 35 to 40 years. Yet, this knowledge has only come into English language in the last few years. There is one book in English, yet it is not available for-sale from any distributor that I can determine. Korean Natural Farming: Indigenous Microorganisms and Vital Power of Crop/Livestock Han Kyu Cho and Atsushi Koyama Korean Natural Farming Association, 1997. 172 p. Here is an address for KNFA: Korean Natural Farming Association (KNFA) 209-2 Woongok-ri, ...
D5988 - 12 Standard Test Method for Determining Aerobic Biodegradation of Plastic Materials in Soil , aerobic, biodegradation, degree (of biodegradation), mineralization, plastics, soil,
In 1984, the U.S. Environmental Protection Agency (EPA) named a hazardous waste site in the state of Louisiana to the National Priority List (NPL). It was estimated at the time that the site held approximately eight million cubic feet of contaminated materials. A computer model was constructed for the site that would simulate the contaminant movement in the subsurface. Modeling efforts resulted in a successful negotiation with the EPA for monitored natural attenuation as the accepted remediation alternative. ("Natural attenuation" refers to the reduction, weakening, and eventual elimination of toxic substances in the soil and groundwater by natures own processes.) This EPA determination was a milestone for the site. Previously a pump-and-treat system, which was based on an initial groundwater model developed to simulate hydraulic containment, had cost millions of dollars to install, operate, and maintain. A carbon absorption system was used to treat the contaminated water recovered. By July ...
Study of the aerobic biodegradation of coke wastewater in a two and three-step activated sludge process.: A laboratory-scale biological plant composed of two ae
The hypothesis that artificial oxic conditions will lead to MTBE biodegradation by indigenous microorganisms in anoxic, gasoline-contaminated aquifers was examined by adding oxygen in the form of a metal peroxide slurry to an anoxic part of gasoline-contaminated aquifer in South Carolina. Field observations of relatively rapid aerobic MTBE biodegradation following oxygen addition suggest that the indigenous bacteria have become acclimated not only to mg/L concentrations of MTBE in the gasoline plume, but also to periodic delivery of oxygen by recharge events. Significant natural attenuation of MTBE could occur if the oxygen limitations naturally associated with gasoline releases can be removed, either under natural conditions where discharging anoxic groundwater comes into contact with oxygen, or artificial conditions where oxygen can be added to aquifers containing mg/L concentrations of MTBE. This final solution might be an effective strategy for intercepting characteristically long MTBE plumes,
The influence of thermal pretreatment on degradation properties of organics in kitchen waste (KW) was investigated. The kinetics results showed that thermal pretreatment could enhance the degradation efficiency of crude protein (CP), fat, oil and grease (FOG), volatile solid (VS) and volatile fatty acids (VFA). Thermal pretreatment showed no significant difference in the final concentration of protein but could decrease the FOG degradation potential (7-36%), while increased the lag phase for degradation of protein and FOG respectively by 35-65% and 11-82% compared with untreated KW. Cumulative biogas yield increased linearly and exponentially with the removal efficiency of VS and other organics (CP and FOG) respectively. Additionally, the reduction of CP increased exponentially with FOG removal efficiency. The calculating methods of biogas yield, organics reduction and corresponding appropriate digestion retention based on FOG and CP reduction amount and pretreatment parameters were ...
Teen uses microbes to biodegrade plastic bags, an article on Bruce Clement - Read all about Teen uses microbes to biodegrade plastic bags here.
D6340-98(2007) Standard Test Methods for Determining Aerobic Biodegradation of Radiolabeled Plastic Materials in an Aqueous or Compost Environment (Withdrawn 2016)
We are studying a representative of a large group of chlorobenzoate degrading bacteria active in uncontaminated systems - Burkholderia phytofirmans OLGA172. Now we know that anthropogenic chemicals have not always been the driving selective force behind the evolution of chloro-organic degradative genes, we are looking for the natural selectors for these capabilities, initially by looking at the environmental triggers and mobile genetic elements that affect chloroaromatic degradative gene expression. The recent genome sequencing of OLGA172 in the lab has expanded this endeavour.. In addition, my lab carries out research on the species composition of bacterial communities in both natural and contaminated systems. These include waste water treatment systems, contaminated soils, rhizospheric communities and the hyporheic zones of streams.. The UTSC campus is heavily infested with an invasive species known as Dog Strangling Vine. My lab has recently begun research into the microbial associations of ...
YAO, Haiyan; REN, Yuan; WEI, Chaohai y YUE, Siyang. Biodegradation characterisation and kinetics of m-cresol by Lysinibacillus cresolivorans. Water SA [online]. 2011, vol.37, n.1, pp.15-20. ISSN 1816-7950.. A novel strain of m-cresol-degrading bacterium, named as Lysinibacillus cresolivorans, was isolated from aerobic sludge from a coking wastewater treatment plant. This bacterium is able to utilise m-cresol as its sole source of carbon and energy. The optimal pH for growth is 6.8 ~ 7.3 and the optimal temperature is 35ºC. Compared to organic nitrogen sources, inorganic nitrogen sources were easily utilised for the m-cresol biodegradation. The degradation rate of m-cresol at different starting concentrations was analysed with zero-order kinetic characteristics. When the initial concentration of m-cresol was 224.2 mg·ℓ-1, the reaction rate reached a maximum at 46.80 mg·(ℓ·h)-1.The cell growth kinetics was also investigated with initial m-cresol concentrations varying from 0 to 1 200 ...
Leakage of trichloroethene (TCE) from a neutralization pond at a former manufacturing facility near Niagara Falls, N.Y. during 1950-87 into the Guelph Formation of the Lockport Group, a fractured dolomite aquifer, created a plume of TCE and its metabolites that, by 1990, extended about 4,300 feet south of the facility. A smaller plume of dense, nonaqueous-phase liquids (DNAPL) probably serves as a continuing source of TCE. The presence of the TCE metabolites cis-1,2-dichloroethene (DCE), vinyl chloride (VC), and ethene in the plume, and the results of previous laboratory microcosm studies, indicate that the TCE is being degraded by naturally occurring microorganisms. Biodegradation rates of TCE and its metabolites were estimated through simulation with BIOMOC, a solute-transport model that represents multispecies reactions through Monod kinetics. A fracture zone in the Guelph Formation was represented as a porous medium containing an extensive, 3-foot thick layer with several interconnected fractures;
2014. Chapleur O., et al., Co-inoculating ruminal content neither provides active hydrolytic microbes nor improves methanization of 13C-cellulose in batch digesters. FEMS Microbiology Ecology, 2014. 87(3): p. 616-629. Desmond-Le Quéméner, E. & Bouchez, T., A thermodynamic theory of microbial growth. The ISME Journal, 2014.. Driss-Limam, R., et al., Members of the uncultured bacterial candidate division WWE1 are implicated in anaerobic digestion of cellulose. MicrobiologyOpen, 2014. 3(2): p.157-167.. Lü, F., et al., Metaproteomics of cellulose methanisation under thermophilic conditions reveals a surprisingly high proteolytic activity. The ISME Journal, 2014. 8: p. 88-102.. Hoyos-Hernandez, C., et al., Elucidation of the thermophilic phenol biodegradation pathway via benzoate during the anaerobic digestion of municipal solid waste. Chemosphere, 2014. 97: p. 115-119.. Bridier, A., & Briandet, R. Contribution of confocal laser scanning microscopy in deciphering biofilm tridimensional structure ...
EARTH scientists have long recognized(1-4) that the soluble organic acids excreted by soil biota enhance rates of mineral weathering, thereby chemically stratifying the soil and affecting the biodegradation pathways of organic matter, including pollutants(5). Multidentate organic ligands(6,7) also exist in industrial waste waters(8) and can enhance the mobility of heavy elements, including radionuclides(9). Here we examine whether rate coefficients for ligand-promoted disolution of minerals can be predicted from existing studies of dissolved metal complexes. We have performed dissolution experiments on bunsenite (NiO) to compare with published studies of ligand exchange around dissolved Ni(lI)-ligand complexes(10-12). The hypothesis is confirmed with surprising detail: the dissolution rate coefficient increases with the number of ligand functional groups coordinated to the surface metal, as do the exchange rate coefficients(10-12). Furthermore, we find that the dissolution rate coefficients can be
Given that over 80 million barreis of crude oil are consumed daily worldwide, it is unsurprising that petroleumhydrocarbons (PHCs) are among the most common contaminants of soils and groundwater. PHCs are water immiscible, i.e. they occur in the form of light nonaqueous phase liquids (LNAPL), and commonly display limited water solubilities and relatively high toxicities. Because of this they are difficult to remove from porous media once emplaced and have the potential to be long-lasting sources of ground water contamination. Biodegradation is widely favored as a technique for the treatment of PHC contamination. It offers cost advantages and has the ability to destroy contaminants instead of simply transferring them between media. Furthermore, it can be applied in situ such that treatment can occur with minimal disturbance to existing structures, be they natural or man made. This thesis seeks to shed light on some of the factors which infiuence the effectiveness of biodegradation in the ...
Biotechnology Conferences 2020 Rome and Bioengineering Conferences 2020 Rome are accredited scientific conferences scheduled in 2020 during June 18-20 is international biotechnology experts gathering
The metabolism of monoaromatic hydrocarbons by an iron-reducing bacterial enrichment culture originating from diesel-contaminated groundwater was examined using d 7 -propylbenzene as a model hydrocarbon. Sequence analysis of the 16S rDNA gene showed that the dominant part (10 of 10 clones) of the enrichment culture consisted of a bacterium closely related to clones found in benzene-contaminated groundwater and to the iron-reducing β- proteobacterium, Rhodoferax ferrireducens (similarity values were 99.5% and 98.3%, respectively). In degradation studies conducted over 18 weeks, d 7 -propylphenols were detected by gas chromatography-mass spectrometry (GC/MS) as intra-cellular metabolites concomitant with cell growth in the cultures. The amount of propylphenols increased during the exponential growth phase, and by the end of this phase 4 × 10 -14 moles of ferric iron were reduced and 3 × 10 -15 moles propylphenol produced for every cell formed. During the stationary growth phase the cell density was
Approximately 500 Tg of isoprene are emitted to the atmosphere annually, an amount similar to that of methane, and despite its significant effects on the climate, very little is known about the biological degradation of isoprene in the environment. Isolation and characterisation of isoprene degraders at the molecular level has allowed the development of probes targeting isoA encoding the α-subunit of the isoprene monooxygenase. This enzyme belongs to the soluble diiron centre monooxygenase family and catalyses the first step in the isoprene degradation pathway. The use of probes targeting key metabolic genes is a successful approach in molecular ecology to study specific groups of bacteria in complex environments. Here, we developed and tested a novel isoA PCR primer set to study the distribution, abundance, and diversity of isoprene degraders in a wide range of environments. The new isoA probes specifically amplified isoA genes from taxonomically diverse isoprene-degrading bacteria including members
Gas chromatography-isotope ratio mass spectrometry (GC-IRMS) has made it possible to analyze natural stable isotope ratios (e.g., 13C/12C, 15N/14N, 2H/1H) of individual organic contaminants in environmental samples. They may be used as fingerprints to infer contamination sources, and may demonstrate, and eve Journal of Environmental Monitoring Top Cited Papers 2009 and 2010
Marić, Petra; Ahel, Marijan; Babić, Olivera; Simeunović, Jelica; Smital, Tvrtko (2020) Ecotoxicological profiling of selected cyanobacterial strains using multi-endpoint effect-directed analysis. Ecotoxicology, 2020 . ISSN 0963-9292 Kostanjevečki, Petra; Petrić, Ines; Lončar, Jovica; Smital, Tvrtko; Ahel, Marijan; Terzić, Senka (2019) Aerobic biodegradation of tramadol by pre- adapted activated sludge culture: Cometabolic transformations and bacterial community changes during enrichment. Science of the Total Environment, 687 . pp. 858-866. ISSN 0048-9697 Kostanjevečki, Petra; Sviličić Petrić, Ines; Lončar, Jovica; Smital, Tvrtko; Ahel, Marijan; Terzić, Senka (2019) Biodegradation study of methadone by adapted activated sludge: Elimination kinetics, transformation products and ecotoxicological evaluation. Chemosphere, 214 . pp. 719-728. ISSN 0045-6535 Terzic, Senka; Udiković-Kolić, Nikolina; Jurina, Tamara; Krizman-Matasic, Ivona; Senta, Ivan; Mihaljević, Ivan; Lončar, Jovica; ...
This volume focuses on biosynthesis, metabolism, biodegradation, functions, properties and applications of miscellaneous polymers, such as hemozoin, thymine-containing styrene polymers, polythioesters, polyphosphate, polyhydroxymethionine, polyketides, natural polyacetals, biodegradation of a wide range of synthetic polymers.
This volume focuses on biosynthesis, metabolism, biodegradation, functions, properties and applications of miscellaneous polymers, such as hemozoin, thymine-containing styrene polymers, polythioesters, polyphosphate, polyhydroxymethionine, polyketides, natural polyacetals, biodegradation of a wide range of synthetic polymers.
Chlorinated organic compounds are extensively employed in industry and agriculture. These chemicals are considered among the most severe public health issues, due to their widespread and uncontrolled release in the environment combined to the recalcitrance to degradation and tendency to bio-accumulate. 1,2-dichloroethane (1,2-DCA) is one of the most widespread chlorinated pollutants. This solvent is a key intermediate in the production of PVC. The public health concern and environmental safety issues related to 1,2-DCA, have fueled the scientific interested on the application of feasible and effective bioremediation strategies, on the identification of microorganisms able to efficiently and rapidly degrade it. 1,2-DCA can undergo microbial-mediated degradation through several aerobic or anaerobic metabolic processes. Due to the typical presence of this pollutant in anoxic environments research has been focused on the anaerobic dehalogenation process based on reductive dechlorination in which ...
Our goal was to tackle the biological conversion of hydrocarbons in an aqueous environment. The basis of the project was generating a "biological chassis", which provides the framework for varying and multiple characteristics needed for the conversion of hydrocarbons, including considerations like conversion ability, hydrocarbon tolerance/solubility and halo (salt) tolerance. This chassis could than be used in for example specifically the biological degradation of oil particles in oil sands tailing water. ...
Cyanotoxins are often found in surface waters worldwide. If contaminated water is consumed, they can bioaccumulate in the liver and cause death in high doses. They can also poison other animals and plants, causing a real threat to life and increasing the potential of disruption in drinking water supply in affected areas. Among all cyanotoxins, microcystin (MC) is the most studied. Herein, Maghsoudi and colleagues report a new bacterium isolate that degrade these toxins and present a study on some factors involved on its biodegradation activity.. MCs are small cyclic toxins composed of seven peptides and, as a result of structural variation, 89 analogues have been identified to date. Their hepatotoxicity is due to the presence of the unique amino acid, Adda, in their structure. They are resistant to enzymatic and physico-chemical breakdown owing to their small cyclic structure. However, they can be biodegraded by a few genus of bacteria.. The majority of studies that have focused on MC ...
The Western Waters Digital Library (WWDL) provides free public access to digital collections of significant primary and secondary resources on water in the western United States. These collections have been made available by research libraries belonging to the Greater Western Library Alliance (GWLA) and other academic library partners. The WWDL is a valuable resource for researchers, policy makers, scholars, Native American tribes, professionals working in various fields, and others interested in contemporary and historic water issues.. ...
Purchase Biotransformations: Microbial Degradation of Health-Risk Compounds, Volume 32 - 1st Edition. Print Book & E-Book. ISBN 9780444819772, 9780080544922
Manufacturer of Bio-Augmentation Products - Roetech 106 PS Microbial Culture, Roetech 302 Microbial Culture, Bio Augmentation Biomass Developement offered by Sudarshan Chemical Industries Limited, Pune, Maharashtra
OSE II is an environmentally safe clean-up method for waste spills because it uses natures own bioremediation processes to effectively eliminate hazardous materials. It is listed on the US Environmental Protection Agencys national contingency plan (NCP) for oil spills.. OSE II is non-toxic to humans, animals, plants and marine life. It is non-poisonous, even if accidentally ingested, and non-irritating to the most sensitive skin. OSE II contains no allergens known to cause skin, respiratory or other allergic reactions.. OSE II is 100%-biodegradable and has a five-year shelf life when stored at temperatures below 120ºF. Freezing does not harm OSE II, however cold temperatures slow its reaction rate somewhat. The product is completely stable and reactive in a pH environment of 3.5pH to 11.7pH.. ...
Urbanization in the world increased the pollution levels in the environment making it for worsen life. General awareness about pollution is increasing today. To control pollution levels, biological methods are eco-safe and economical. In this study a wild strain of Bacillus species was isolated and optimized for bioremediation studies of ammonia in flask cultures. Strategy was tried to develop for ammonia bioremediation in a single stage aerobic nitrification and denitrification. The results reveal that the optimum pH for the isolated Bacillus species was 7 and optimum temperature was 30°C. At optimum pH and temperature this organism was able to remove 99.2% of ammonia in flask cultures supplemented with 5g/L of ammonium sulphate. The biomass obtained after bioremediation studies was 0.3g/L which is very low. The study on ammonia toxicity revealed that toxicity was due to pH and osmolarity.
Phytoremediation is the use of plants to clean up contaminated soil and water. The pollutants can be stored in the plant (phytoextraction), volatized by the plant (phytovolatization) or metabolized by plant derived-enzymes (phytodegradation). Click on the type of phytoremediation you wish to observe.
The toxic and carcinogenic compound 1,2-dichloropropane (DCP) is widely used in industry and agriculture. DCP shows a low chemical reactivity. It is only moderately soluble in aqueous systems and almost recalcitrant to microbial degradation under aerobic conditions. As a consequence DCP accumulates in groundwater, sediments and soil, thus endangering humans and animals via the food chain. To efficiently transform DCP to harmless organic compounds microbial mixed cultures have been enriched from sediments and were subsequently transferred into a fluidized bed bioreactor. This process allowed a continuous anaerobic dechlorination of DCP to propene. Bioreactor processes using complex microbiota represent a promising technology for transformation of chlorinated compounds. However, the composition of the used population is usually unknown, hence hindering both optimization and control of the degradation process. Subject of this work was the analysis of the microbial diversity of the ...
There are no reliable ready biodegradation data available for triethoxy(methyl)silane, therefore good quality data for the analogue substance, triacetoxyethylsilane (CAS 17689 -77 -9), have been read across. Both substances hydrolyse to structurally-related silanol hydrolysis products, methylsilanetriol and ethylsilanetriol. The other hydrolysis products being ethanol and acetic acid, respectively. Therefore, triethoxymethylsilane hydrolyzes rapidly into ethanol which is readily biodegradable and methylsilanetriol which is not. Both triethoxy(methyl)silane and triacetoxyethylsilane are within an analogue group of substances within which, in general, there is no evidence of any significant biodegradation once biodegradation of alkoxy/acetoxy groups has been taken into account. It is therefore considered valid to read-across the results for triacetoxyethylsilane to fill the data gap for the registered substance. This wider analogue group for the ready biodegradability endpoint consists of a number ...
The objective of this research project was to further develop a software system called BESS (Biodegradation Evaluation and Simulation System), which can predict the biodegradability of a compound based on the structural features of that compound and the prevailing environmental conditions. The approach pursued in the development of BESS is based on the iterative use of plausible enzymatic transformations that are hierarchically organized based on knowledge of microbial physiology and ecology. This organization reduces the potentially large number of enzymatic transformations that could apply to a compound, making the approach computationally feasible. Further, only those enzymatic transformations that are most likely to provide anabolic intermediates or energy to microorganisms and thus have evolved through processes of natural selection are used. This further reduces the complexity. BESS employs a fundamentally different approach to the prediction of whether a given chemical will undergo ...
According to Regulation (EC) No. 1907/2006, Annex VIII, section 9.2.2.1, column 2, the study need not be conducted if the substance is highly insoluble in water or the substance is readily biodegradable. The water solubility of the test substance is 47 µg/L at 20 °C and is therefore classed as insoluble. Furthermore a Ready Biodegradability test shows 54.1% degradation after 28 days. Although this does not fulfill the minimum criteria set out by the OECD method, it does however indicate that the material achieved ,50 % within 30 days, highlighting its propensity for biodegradation. An inherent biodegradability test shows 80.5% degradation after 28 days, therefore it is considered that the material is inherently biodegradable and as such not persistent in environmentally significant conditions. Therefore given the poor solubility and propensity for biodegradation further studies are scientifically unjustified. ...
For in-depth characterization and culture optimization of microorganisms for industrial biotech applications, TWB and Hamilton have developed a unique and custom made microbial culture robot.
For the removal of toxic and recalcitrant organic substances from wastewater, bioaugmentation with bacteria harbouring specific degradation pathways in activate
Natural selection is typically more effective at the level of the individual than the group, because individuals replicate faster and can invade other groups. Consequently, there will inevitably be selection for non‐detoxifying mutants who pay a reduced or no cost of detoxification but still reap the benefits provided by their detoxifying counterparts. This fitness advantage may facilitate invasion of detoxifying groups, which can impose a large growth cost on the group as a whole, in a microbial "Tragedy of the Commons" scenario (see Sidebar A). The net result is reduced bioremediation efficiency.. The problem of common, vital, and limited resources has been extensively modeled in a wide range of scenarios from car traffic to greenhouse gas emissions to show how pursuing individual benefits contrary to the best interests of the group leads to the collapse of societal function. A few studies have recently addressed the Tragedy of the Commons scenario in the specific context of bioremediation. ...
Injectable hydrogels with biodegradability have in situ formability which in vitro/in vivo allows an effective and homogeneous encapsulation of drugs/cells, and convenient in vivo surgical operation in a minimally invasive way, causing smaller scar size and less pain for patients. Therefore, they have found
The current research makes a comparative analysis between the biodegradation of polythene and plastic by five different types of soil sample collected from different sour..
The fermentation of sugar (C6H12O6) to form ethanol (C2H5OH) and carbon dioxide (CO2) occurs according to the following equation: C6H12O6(aq) ¡ú 2 C2H5OH(aq) + 2 CO2(g) kJ mol¨C1 ¦¤Hf (C6H12O6(s)) is ¨C1275 ¦¤Hf (C2H5OH(l ...
Screening for ready biodegradability In a study with a substance analogue (amphoacetates C12), conducted according to OECD 301B and GLP (reliability 1), a degree of biodegradation of ,60% was reached after 14 days. The validity criteria were fulfilled. Based on the results of this study and the nature of the source chemical, amphoacetates C12 is considered to be readily biodegradable in accordance with the OECD Guideline. This result is read-across to the registered substance. Screening for inherent biodegradability From a study conducted similar to OECD 302B (reliability 4) it was shown that the substance is inherently biodegradable under the conditions of the OECD Guideline. The validity of this study cannot be assessed as no blank inoculum control was included and as the report lacks important details. ...
PNNL scientists find that electron donor source influences reduction of radionuclides by Anaeromyxobacter. Results could influence bioremediation strategies for subsurface contamination.
Bioremediation of Pharmaceutical Wastes: 10.4018/978-1-5225-2325-3.ch016: The astounding increase in the use of pharmaceuticals in the last decade has raised concerns over their occurrence in the soils and wastewaters posing
Bacteria, like humans and animals, must eat. Sometimes, they consume a pollutant in the environment that humans want to get rid of, a process called bioremediation. Investigating the enzymes used by bacteria to carry out ...
SEMINAR PRESENTATION ONGREEN POLYMERS PRESENTED BY: GAUTAM AHUJA M.TECH- POLYMER TECHNOLOGY 1st Year ROLL NO: 2k11/PTE/02 WHAT ...
Biodegradable Products Institute provides certification services for compostable products. BPI-certified products meet ASTM D6400 or D6868 testing standards to certify they will biodegrade in a managed compost facility.
The main symptoms of finger gout are sudden severe pain in the joint, redness and swelling at the joint and lingering discomfort after the initial attack, according to Mayo Clinic. There may also be...
Among people who suffer a stroke, one in 12 are likely to have another stroke soon after the initial attack and one in four will die within a year, according to
Soil column was equipped with the sediments and aquifer media collected from Weihe Riverbed and its bank, and was used to research the...
(2013) Dasgupta et al. ISRN Biotechnology. The bioavailability of organic contaminants to the degrading bacteria is a major limitation to efficient bioremediation of sites contaminated with hydrophobic pollutants. Such limitation of bioavailability can be overcome by steady-state biofilm-based r...
Shinohara, A., Imai, A., Komatsu, K., Matsushige, K., Nara, F. 2008 Application of HPLC-PAD to highly sensitive analysis of dissolved carbohydrates and theit composition in lake water and extracellular organic matter derived from algae. J. Jpn. Soc. Wat. Environ., 31, 447-454 (in Japanese with English summary ...
From a collection of microcosms with MTBE-or ETBE-degradation capacities as a point of departure, the global objective of the project is to obtain, through an integrated research program, a detailed bank of data on the structure of microbial populations under such a selective pressure. Intermediate objectives will help achieving this aim: -The phylogenic analysis of the microcosms with MTBE- or ETBE- degradation capacities will allow determining the relative occurrence of the different groups of microorganisms that are present in microcosms with MTBE or ETBE biodegradation capacities. More specifically, such a study will determine if there is a specific microbial pattern arising from the phylogenic analysis of microcosms isolated from different geographic area (by DGGE and isolation studies). Another important question concerns the possible involvement of non-cultivable microorganisms in MTBE- or ETBE-biodegradation and it will be addressed by a coupled SIP/NanoSIMS approach using 13C-labelled ...
1 AND search condition: data satisfying all conditions will be searched. (e.g.) When boxes A and B are selected under the AND condition, search results will include hits with both A and B parameters.. ※2 OR search condition: data satisfying each condition will be searched. (e.g.) When boxes A and B are selected under the OR condition, data including either A or B will be shown in the search result.. ...
This project will develop the flow through bioreactor of 3D-structured bacteria for biodegradation of aromatic chloroderivatives from contaminated water.
The aim of this review is to give a general account on the oxidative microbial degradation of flavonols. Since now 50 years, various research groups have deciphered the way microorganisms aerobically