Download or read book Mineralization of Atrazine by Bacteria Isolated from Shallow Subsurface Sediments written by Nathan Robert Pechacek and published by . This book was released on 1998 with total page 238 pages. Available in PDF, EPUB and Kindle. Book excerpt: Atrazine [2-chloro-4-ethylamino-6-isopropylamino-1,3,5-triazinel, a corn herbicide, is a common contaminant of ground water. Biodegradation in subsurface sediments represents a potential remediation for atrazine contaminated aquifers. In a previous study, atrazine was degraded within 40 days by sand from sample 3B-3.2, cored from a former agricultural chemical dealership near the water table at 2.8-3.5 meters. The purpose of this study was to isolate atrazine-degrading bacteria from a sample from 3B-3.2. Inoculation of nitrogen-limited medium with sediment from interval 3B-3.2 resulted in the isolation of a mixed bacterial culture labeled MC-067. MC-067 can degrade 20 mg L−1 atrazine as a sole carbon and nitrogen source within 50 days.

Download or read book Biodegradation of Atrazine in Subsurface Environments written by Jim Sinclair and published by . This book was released on 1992 with total page 16 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Biodegradation of Atrazine in Shallow Subsurface Sediment at an Agricultural Chemical Dealership written by Rachel Ann Ames and published by . This book was released on 1997 with total page 316 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Microbial Mineralization of Atrazine in Riparian and Estuarine Sediments written by Dana C. Cresci and published by . This book was released on 1997 with total page 252 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Acta Agronomica Hungarica written by and published by . This book was released on 2004 with total page 992 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Applied Bioremediation and Phytoremediation written by Ajay Singh and published by Springer Science & Business Media. This book was released on 2013-06-29 with total page 312 pages. Available in PDF, EPUB and Kindle. Book excerpt: The huge expansion of the chemical and petroleum industries in the twentieth century has resulted in the production of a vast array of chem ical compounds and materials that have transformed our lives. The associated large-scale manufacturing, processing and handling activi ties have caused a serious deterioration in environmental quality and created threats to human health. These negative impacts have led to responses and regulations requiring remedial action in support of envi ronmental sustainability. of biotechnological methods through bioremediation, Application has gained prominence as an option for soil remediation methods. Bioremediation is a multidisciplinary approach where biologists, chem ists, soil scientists and engineers work as team to develop and imple ment remediation processes. Bioremediation has now been used successfully to remediate many petroleum-contaminated sites. However, there are as yet no commercial technologies commonly used to reme diate the most recalcitrant contaminants. Nevertheless, bioremediation is a rapidly advancing field and new bio-based remedial technologies are continuing to emerge.

Download or read book Master s Theses Directories written by and published by . This book was released on 1999 with total page 492 pages. Available in PDF, EPUB and Kindle. Book excerpt: "Education, arts and social sciences, natural and technical sciences in the United States and Canada".

Download or read book Commencement written by Iowa State University and published by . This book was released on 1998 with total page 510 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Atrazine Mineralization Potential and Catabolic Gene Detection in Agricultural and Wetland Sites written by Kristen Lynn Anderson and published by . This book was released on 2003 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Abstract: Atrazine (2-chloro-4-ethylamine-6-isopropylamino-1,3,5 triazine) is a commonly applied herbicide in corn fields. Although the fate of atrazine in agricultural systems has been well studied, the environmental fate of atrazine in wetland systems is less well characterized. The majority of research in this area has focused on aerobic mineralization of atrazine, although anaerobic conditions are commonly found in wetland sediments and bulk soils associated with agricultural fields. The hypothesis for this work was that atrazine would be actively mineralized in agricultural and wetland sites. It was further hypothesized that active mineralization in soils could be correlated with the presence of selected genes involved in atrazine metabolism. Soil, sediment, and water samples were obtained from three sites in Ohio. Atrazine mineralization was investigated under aerobic and anaerobic conditions in these samples using a biometer system in which 14CO 2 evolution was correlated with atrazine mineralization. All samples mineralized atrazine under aerobic conditions. Under anaerobic conditions, some external electron acceptor amendments inhibited mineralization, while others enhanced it. The effect on mineralization varied with the sample and season. Attempts were made to amplify some of the genes involved in atrazine mineralization. Community DNA was isolated from each sample and PCR amplification using three primer sets specific for atzA, trzD, and trzN was performed. Although PCR inhibitors were present in many of the samples, trzN and trzD could be successfully amplified from some DNA samples. All Defiance samples tested positive for trzN with the exception of field B and reservoir water samples. An analog of trzD was amplified from DNA extracted from Defiance and OSU wetland samples. The atzA gene was not detected in any of the samples. An atrazine mineralizing bacterium was isolated from Piketon soil samples and another was obtained from Defiance corn soil. Characterization of these organisms by 16S rDNA sequencing and FAME analysis indicated that both organisms were Arthrobacter spp. From these results, it is clear that the potential for atrazine mineralization was identified in agricultural soils and wetland sediments. No correlation could be made between atrazine mineralization and the presence of any of the tested genes involved in atrazine mineralization.

Download or read book Environmental Toxicology and Chemistry written by and published by . This book was released on 2004 with total page 812 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Bioavailability of Contaminants in Soils and Sediments written by National Research Council and published by National Academies Press. This book was released on 2003-05-03 with total page 433 pages. Available in PDF, EPUB and Kindle. Book excerpt: Bioavailability refers to the extent to which humans and ecological receptors are exposed to contaminants in soil or sediment. The concept of bioavailability has recently piqued the interest of the hazardous waste industry as an important consideration in deciding how much waste to clean up. The rationale is that if contaminants in soil and sediment are not bioavailable, then more contaminant mass can be left in place without creating additional risk. A new NRC report notes that the potential for the consideration of bioavailability to influence decision-making is greatest where certain chemical, environmental, and regulatory factors align. The current use of bioavailability in risk assessment and hazardous waste cleanup regulations is demystified, and acceptable tools and models for bioavailability assessment are discussed and ranked according to seven criteria. Finally, the intimate link between bioavailability and bioremediation is explored. The report concludes with suggestions for moving bioavailability forward in the regulatory arena for both soil and sediment cleanup.

Download or read book Bibliography of Agriculture with Subject Index written by and published by . This book was released on 2000 with total page 416 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Weed Technology written by and published by . This book was released on 1996 with total page 492 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Ambient Aquatic Life Water Quality Criteria for Atrazine written by and published by . This book was released on 2001 with total page 228 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Chemical Abstracts written by and published by . This book was released on with total page 2664 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Selected Water Resources Abstracts written by and published by . This book was released on 1991 with total page 804 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Novel Approaches for Bioremediation of Organic Pollution written by Raffi Fass and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 353 pages. Available in PDF, EPUB and Kindle. Book excerpt: Proceedings of the 42nd OHOLO Conference held in Eilat, Israel, May 3-7, 1998