Download or read book Bacterial Adaptation to the Chlorinated Compounds written by Maude David and published by . This book was released on 2009 with total page 238 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis concerns the bacterial adaptation to the chlorinated compounds at both the gene level and the microbial community level. The bibliography will focus on the adaptation mechanisms developed by bacteria to respond to environmental stresses and on the possible origins of the genes responsible for the first steps of chlorinated compound degradation, those encoding for the dehalogenases, which perform the dechlorination or chlorine removal step. The second chapter of the thesis consists of an experimental exploration of the gene shuffling hypothesis presented in the bibliography, using linB and dhaA genes. The next chapter examines the bacterial community structure in relation to compound degradation using the reductive dechlorination of tetrachloroethylene. For this study, molecular biology tools, specifically phylochip microarrays were used to examine bacterial community structure from the moment of pollutant introduction to the environment and during bioremediation. In order to elucidate the metabolic functions, which correlate the PCE degradation, phylogenetic results were compared with functional genes in the microcosms studied. The last chapter of this global study on chlorinated compound degradation genes was to link the microbial community structure kinetics with the chemical degradation kinetics. In order to evaluate the molecular biological parameters of the microbial community, all the genes known to be involved in the entire pathway of PCE reductive dechlorination were quantified. This global study, incorporating chemical monitoring, dehalogenase quantification and microbial community structure, produced correlations between the environmental conditions necessary for dechlorination and the microbial community associated with dehalogenase expression. In summary, both the mechanisms implemented by the bacteria to degrade this compound pollutant and the bacterial community structure during the pollutant degradation were addressed. Improving the understanding of these two steps in bacterial adaptation can contribute to the understanding of bacterial and environmental cleanup capabilities.
Download or read book Bioremediation of Chlorinated and Polycyclic Aromatic Hydrocarbon Compounds written by Battelle Memorial In and published by CRC Press. This book was released on 1994-02-28 with total page 548 pages. Available in PDF, EPUB and Kindle. Book excerpt: This timely reference presents the state of the art of the emerging and rapidly changing field of bioremediation of chlorinated solvents, PCBs, and other chlorinated compounds, as well as PAHs, both in situ and on site. This landmark publication reports significant advances in bioremediation, with an emphasis on practical applications and state-of-the-art developments. Laboratory and field-oriented reviews are presented with the objective of tying treatability studies and recent laboratory developments to field applications. No other reference source gives you access to the most current techniques and methods for the bioremediation of chlorinated and polycyclic aromatic hydrocarbon compounds. This book represents the work of leading experts in the fields of in situ and on-site bioremediation from North America, Europe, and Asia. The chapters include current field applications and laboratory studies undertaken, in some cases, in countries with regulatory standards more stringent than those of the United States.
Download or read book Microbial Stress Adaptation and Food Safety written by Ahmed E. Yousef and published by CRC Press. This book was released on 2002-12-17 with total page 368 pages. Available in PDF, EPUB and Kindle. Book excerpt: The first book to address the subject, Microbial Stress Adaptation and Food Safety emphasizes the implications of stress adaptation and its consequences for food safety. It covers the basic science, kinetics, mechanisms, assessment, and control of stress adaptation and its impact on the safety of foods produced by minimal processing or non-thermal technologies. World renowned experts in the field provide detailed accounts of problems associated with stress adaptation and suggest practical solutions for overcoming these problems.
Download or read book Microbial Decomposition of Chlorinated Aromatic Compunds written by James W. Blackburn and published by . This book was released on 1986 with total page 296 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Bacterial Adaptation to Co resistance written by Santi M. Mandal and published by Springer Nature. This book was released on 2019-11-17 with total page 324 pages. Available in PDF, EPUB and Kindle. Book excerpt: The proposed book aims to understand the mechanism of survival of microorganisms in response to chemical stress in various ecological niches that suffer direct human intervention, more so the agricultural, domestic and hospital settings. Microbicides (e.g. disinfectants, antiseptics, fungicides, algaecides, insecticides and pesticides) are used rampantly to control undesirable microbes. Insecticides and pesticides are routinely used in agriculture which directly affect the microbial population in farms, orchards and fields. Health care environments are always stressed with disinfectants and antibiotics. It is always probable that microbicide-stressed microorganisms are in a dynamic state, displaced from one niche to the other. Some soil and water borne bacteria or their resistance determinants are also getting prominence in hospital settings after suffering selective pressure from agricides. In order to reveal the survival strategies of microbicidal-resistant microbes, it is of prime importance to know the mode of action of these complete range of microbicides (agricides to antibiotics). The present book intends to address these issues. There will be several chapters dealing with tolerance and cross resistance in microbes and bacteria in particular, dwelling in various niches. Till date, there is no consensus among scientists in theorizing molecular mechanisms to explain bacterial tolerance and their cross resistance to agricides and antibiotics.
Download or read book Cellular Ecophysiology of Microbe written by Tino Krell and published by Springer. This book was released on 2018-03-24 with total page 585 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book assembles concisely written chapters by world-leaders in the field summarizing recent advances in understanding microbial responses to hydrocarbons. Subjects treated include mechanisms of sensing, hydrocarbon tolerance and degradation as well as an overview on hydrophobic modification of biomolecules. Other chapters are dedicated to issues related to the reduced bioavailability of hydrocarbons, which differentiates this class of compounds form many others, but which of central importance to understand the ecophysiological consequences. This book should be standard literature in any laboratory working in this area.
Download or read book Enzymes in the Environment written by Richard G. Burns and published by CRC Press. This book was released on 2002-01-29 with total page 642 pages. Available in PDF, EPUB and Kindle. Book excerpt: The need to understand the biological processes that are important for essential aquatic and terrestrial ecosystem function has prompted much research into the field of ecological enzymology. This book presents the two broad areas of application in a compilation of reviews by 21 international experts in their respective fields. The first explores enzymatic activities to assess the processes or mechanisms that operate in a given system, such as the rhizosphere, plant leaves and shoots, soil surfaces, and biofilms. The second considers enzymes or microbial cells as sensors to detect microbial activity and stresses due to pollution, management, or climatic change in both aquatic and terrestrial ecosystems.
Download or read book Environmental Health Perspectives written by and published by . This book was released on 1993 with total page 562 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Biodegradation written by and published by . This book was released on 1995 with total page 146 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Microbial Biodegradation and Bioremediation written by Surajit Das and published by Elsevier. This book was released on 2014-07-01 with total page 641 pages. Available in PDF, EPUB and Kindle. Book excerpt: Microbial Biodegradation and Bioremediation brings together experts in relevant fields to describe the successful application of microbes and their derivatives for bioremediation of potentially toxic and relatively novel compounds. This single-source reference encompasses all categories of pollutants and their applications in a convenient, comprehensive package. Our natural biodiversity and environment is in danger due to the release of continuously emerging potential pollutants by anthropogenic activities. Though many attempts have been made to eradicate and remediate these noxious elements, every day thousands of xenobiotics of relatively new entities emerge, thus worsening the situation. Primitive microorganisms are highly adaptable to toxic environments, and can reduce the load of toxic elements by their successful transformation and remediation. - Describes many novel approaches of microbial bioremediation including genetic engineering, metagenomics, microbial fuel cell technology, biosurfactants and biofilm-based bioremediation - Introduces relatively new hazardous elements and their bioremediation practices including oil spills, military waste water, greenhouse gases, polythene wastes, and more - Provides the most advanced techniques in the field of bioremediation, including insilico approach, microbes as pollution indicators, use of bioreactors, techniques of pollution monitoring, and more
Download or read book Twenty Years of Research and Development on Soil Pollution and Remediation in China written by Yongming Luo and published by Springer. This book was released on 2018-01-17 with total page 814 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book reviews the progresses and achievements made in the past 20 years of research on soil pollution and remediation in China, and presents 50 review and research articles from all over China, including Hong Kong and Taiwan. The authors include scientists, engineers, entrepreneurs and managers from 26 universities, 18 institutes, 4 leading enterprises and 2 government environmental protection departments. The contents cover fundamental research on soil pollution and remediation, technical development, project demonstration, policy and governance. The polluted soil/site types include farmland, industrial sites, mining areas and oilfields, with heavy metals (cadmium, arsenic, copper, chromium, mercury, lead, zinc, nickel, etc.), organic pollutants (PAHs, PCBs, organochlorine pesticides, phthalate esters, halogenated hydrocarbons, etc.), and metal–organic mixed pollutants. The remediation techniques mainly include physical and chemical remediation (thermal desorption, soil vapor extraction, in situ advanced chemical oxidation, solidification and stabilization), phytoremediation (phytostabilization, phytoextraction by hyperaccumulators, phyto-prevention by low accumulation plants), bioremediation (microbial adsorption and immobilization, microbial degradation, microbe-enhanced phytoremediation), and combined remediation merging multiple technologies. The governance and policy section mainly explores laws and regulations, criteria and standards, financial guarantees and the industrial market for soil environment and pollution prevention.
Download or read book Human Tissue Monitoring and Specimen Banking written by and published by . This book was released on 1993 with total page 714 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Genomic Adaptation for Organohalide Respiration of Vinyl Chloride and Other Priority Pollutants by the Anaerobic Bacterium Dehalococcoides written by Paul Joseph McMurdie (II.) and published by Stanford University. This book was released on 2011 with total page 174 pages. Available in PDF, EPUB and Kindle. Book excerpt: Vinyl chloride (VC) is a widespread groundwater pollutant and Group 1 carcinogen. Microbial respiration of VC is both critical for complete remediation of chloroethenes in situ, and a unique physiology only observed by certain strains of Dehalococcoides. Two different genes independently encoding VC respiration in Dehalococcoides, vcrA and bvcA, were identified previously, each a member of the diverse family of reductive dehalogenase homologous genes, or rdhA. In this thesis I report that vcrA and bvcA are among a subset of putative 'foreign' rdhA with a low GC3 codon usage that favors the nucleotide T, even though tRNAs recognizing T-ending codons are categorically absent in Dehalococcoides genomes. Comparative genomics of the first two complete genome sequences of microorganisms able to respire VC, Dehalococcoides strains VS and BAV1, reveals that vcrA and bvcA are both located within recently integrated, but different, genomic islands (GIs). These islands have different predicted integration sites and different relative positions in the genome, suggesting that bvcA and vcrA were acquired independently and through different mechanisms. In particular, the vcrA-containing GI appears to have integrated at the single-copy tmRNA encoding gene, ssrA, along with many other homologous elements that site-specifically integrate/excise at ssrA -- some of which contain other rdhA. A detailed analysis of these 'ssrA-GIs' in Dehalococcoides identifies the precise position of insertion as well as a conserved module of syntenic integration-associated genes that includes the likely ssrA-specific integrase. Further analysis of (meta)genomic data, as well as targeted sequencing from 4 additional VC-respiring cultures, provided a total of 8 syntenic vcr-GIs from independently derived cultures. Evolutionary estimates for the age of divergence of these 8 vcrA sequences is not confidently distinguishable from the first industrial synthesis of chlorinated ethenes approximately 100 years ago. By contrast, the estimated age of divergence of Dehalococcoides strains far precedes industrial civilization. Overall, ssrA-GIs appear to be a major contributor to the second of two high plasticity regions, genetically dynamic regions that interrupt an otherwise stable, syntenic, and streamlined Dehalococcoides genome -- among the smallest of any free living microorganism. The apparent compartmentalization of Dehalococcoides genome dynamics within specialized regions may enhance opportunistic adaptation to (new) organohalide respiratory niches while protecting a core genome that is highly adapted to life in the anoxic subsurface, exemplified here by the recent site-specific acquisition of VC reductase genes.
Download or read book In Situ Bioremediation written by National Research Council and published by National Academies Press. This book was released on 1993-02-01 with total page 225 pages. Available in PDF, EPUB and Kindle. Book excerpt: In situ bioremediationâ€"the use of microorganisms for on-site removal of contaminantsâ€"is potentially cheaper, faster, and safer than conventional cleanup methods. But in situ bioremediation is also clouded in uncertainty, controversy, and mistrust. This volume from the National Research Council provides direction for decisionmakers and offers detailed and readable explanations of: the processes involved in in situ bioremediation, circumstances in which it is best used, and methods of measurement, field testing, and modeling to evaluate the results of bioremediation projects. Bioremediation experts representing academic research, field practice, regulation, and industry provide accessible information and case examples; they explore how in situ bioremediation works, how it has developed since its first commercial use in 1972, and what research and education efforts are recommended for the future. The volume includes a series of perspective papers. The book will be immediately useful to policymakers, regulators, bioremediation practitioners and purchasers, environmental groups, concerned citizens, faculty, and students.
Download or read book Dehalogenation written by Max M. Häggblom and published by Springer Science & Business Media. This book was released on 2007-05-08 with total page 702 pages. Available in PDF, EPUB and Kindle. Book excerpt: Halogenated organic compounds constitute one of the largest groups of environmental chemicals. The industrial production of new halogenated organic compounds has increased throughout the last century peaking in the 1960s, and continuing in widespread use today. Organohalides are integral to a variety of industrial applications, including use as solvents, degreasing agents, biocides, pharmaceuticals, plasticizers, hydraulic and heat transfer fluids, and intermediates for chemical synthesis, to name a few. It is important to recognize the beneficial aspects of halogenated organic compounds, as well as their potentially deleterious impact on the environment and health. Recognition ofthe adverse environmental effects ofmanytypes oforganohalide compounds has led to efforts to reduce or eliminate the most problematic ones. Although organohalide compounds are typically considered to be anthropogenic industrial compounds, they have their counterpart in several thousands of natural biogenic and geogenic organohalides, representing most classes of organic chemicals. Natural sources account for a significant portion of the global organohalogen budget. This volume authored by recognized experts in the field provides a current perspective on how both natural and synthetic organohalides are formed and degraded, and how these processes are incorporated into a global halogen cycle. The focus is on microbial processes, since these play a major role both in the production and degradation, i. e. , cycling of halogenated organic compounds inthe environment. This book is organized into five parts. Part I, Introduction, provides a global perspective on the issues of organohalides and their fate in the environment.
Download or read book Applied and Environmental Microbiology written by and published by . This book was released on 2007 with total page 720 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book In Situ Remediation Engineering written by Suthan S. Suthersan and published by CRC Press. This book was released on 2004-12-28 with total page 534 pages. Available in PDF, EPUB and Kindle. Book excerpt: In Situ Remediation Engineering provides a comprehensive guide to the design and implementation of reactive zone methods for treatment of all major classes of groundwater contamination. It teaches the fundamentals that underlie development of cost-effective reactive zone strategies, guides the selection of cost-effective remedial strategies and provides environmental engineers and scientists with tools to achieve optimal deployment of source area, reactive barrier, and site-wide treatments. It offers extensive coverage of remedial system operation, discussing reagent injection strategies, interpretation of process monitoring results for biological and chemical reactive zone systems, and impacts of treatment processes on aquifer hydraulic characteristics.
