Metagenomics Of The Microbial Nitrogen Cycle
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Metagenomics Of The Microbial Nitrogen Cycle
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Author : Diana Marco
language : en
Publisher: Caister Academic Press Limited
Release Date : 2014
Metagenomics Of The Microbial Nitrogen Cycle written by Diana Marco and has been published by Caister Academic Press Limited this book supported file pdf, txt, epub, kindle and other format this book has been release on 2014 with Science categories.
The nitrogen (N) cycle is one of the most important nutrient cycles on the planet, and many of its steps are performed by microbial organisms. During the cycling process, greenhouse gases are formed, including nitrous oxide and methane. In addition, the use of nitrogen fertilizers increases freshwater nitrate levels, causing pollution and human health problems. A greater knowledge of the microbial communities involved in nitrogen transformations is necessary to understand and counteract nitrogen pollution. This book - written by renowned researchers who are specialized in the most relevant and emerging topics in the field - provides comprehensive information on the new theoretical, methodological, and applied aspects of metagenomics and other 'omics' approaches used to study the microbial N cycle. The book provides a thorough account of the contributions of metagenomics to microbial N cycle background theory. It also reviews state-of-the-art investigative methods and explores new applications in water treatment, agricultural practices, climate change, among others. The book is recommended for microbiologists, environmental scientists, and anyone interested in microbial communities, metagenomics, metatranscriptomics, and metaproteomics of the microbial N cycle.
Microbial Nitrogen Cycling Dynamics In Coastal Systems
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Author : Annika Carlene Mosier
language : en
Publisher: Stanford University
Release Date : 2011
Microbial Nitrogen Cycling Dynamics In Coastal Systems written by Annika Carlene Mosier and has been published by Stanford University this book supported file pdf, txt, epub, kindle and other format this book has been release on 2011 with categories.
Human influence on the global nitrogen cycle (e.g., through fertilizer and wastewater runoff) has caused a suite of environmental problems including acidification, loss of biodiversity, increased concentrations of greenhouse gases, and eutrophication. These environmental risks can be lessened by microbial transformations of nitrogen; nitrification converts ammonia to nitrite and nitrate, which can then be lost to the atmosphere as N2 gas via denitrification or anammox. Microbial processes thus determine the fate of excess nitrogen and yet recent discoveries suggest that our understanding of these organisms is deficient. This dissertation focuses on microbial transformations of nitrogen in marine and estuarine systems through laboratory and field studies, using techniques from genomics, microbial ecology, and microbiology. Recent studies revealed that many archaea can oxidize ammonia (AOA; ammonia-oxidizing archaea), in addition to the well-described ammonia-oxidizing bacteria (AOB). Considering that these archaea are among the most abundant organisms on Earth, these findings have necessitated a reevaluation of nitrification to determine the relative contribution of AOA and AOB to overall rates and to determine if previous models of global nitrogen cycling require adjustment to include the AOA. I examined the distribution, diversity, and abundance of AOA and AOB in the San Francisco Bay estuary and found that the region of the estuary with low-salinity and high C:N ratios contained a group of AOA that were both abundant and phylogenetically distinct. In most of the estuary where salinity was high and C:N ratios were low, AOB were more abundant than AOA—despite the fact that AOA outnumber AOB in soils and the ocean, the two end members of an estuary. This study suggested that a combination of environmental factors including carbon, nitrogen, and salinity determine the niche distribution of the two groups of ammonia-oxidizers. In order to gain insight into the genetic basis for ammonia oxidation by estuarine AOA, we sequenced the genome of a new genus of AOA from San Francisco Bay using single cell genomics. The genome data revealed that the AOA have genes for both autotrophic and heterotrophic carbon metabolism, unlike the autotrophic AOB. These AOA may be chemotactic and motile based on numerous chemotaxis and motility-associated genes in the genome and electron microscopy evidence of flagella. Physiological studies showed that the AOA grow aerobically but they also oxidize ammonia at low oxygen concentrations and may produce the potent greenhouse gas N2O. Continued cultivation and genomic sequencing of AOA will allow for in-depth studies on the physiological and metabolic potential of this novel group of organisms that will ultimately advance our understanding of the global carbon and nitrogen cycles. Denitrifying bacteria are widespread in coastal and estuarine environments and account for a significant reduction of external nitrogen inputs, thereby diminishing the amount of bioavailable nitrogen and curtailing the harmful effects of nitrogen pollution. I determined the abundance, community structure, biogeochemical activity, and ecology of denitrifiers over space and time in the San Francisco Bay estuary. Salinity, carbon, nitrogen and some metals were important factors for denitrification rates, abundance, and community structure. Overall, this study provided valuable new insights into the microbial ecology of estuarine denitrifying communities and suggested that denitrifiers likely play an important role in nitrogen removal in San Francisco Bay, particularly at high salinity sites.
Metagenomics Of Microbial Communities Involved In Nitrogen Cycling
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Author :
language : en
Publisher:
Release Date : 2016
Metagenomics Of Microbial Communities Involved In Nitrogen Cycling written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2016 with categories.
Research On Nitrification And Related Processes Part A
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Author : Martin G. Klotz
language : en
Publisher: Academic Press
Release Date : 2011-01-10
Research On Nitrification And Related Processes Part A written by Martin G. Klotz and has been published by Academic Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2011-01-10 with Reference categories.
State-of-the-art update on methods and protocols dealing with the detection, isolation and characterization of macromolecules and their hosting organisms that facilitate nitrification and related processes in the nitrogen cycle as well as the challenges of doing so in very diverse environments. Provides state-of-the-art update on methods and protocols Deals with the detection, isolation and characterization of macromolecules and their hosting organisms Deals with the challenges of very diverse environments
Microbial Control Of The Nitrogen Cycle
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Author : Lourdes Girard
language : en
Publisher: Frontiers Media SA
Release Date : 2020-07-02
Microbial Control Of The Nitrogen Cycle written by Lourdes Girard and has been published by Frontiers Media SA this book supported file pdf, txt, epub, kindle and other format this book has been release on 2020-07-02 with categories.
Soil Nitrogen Ecology
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Author : Cristina Cruz
language : en
Publisher: Springer Nature
Release Date : 2021-05-24
Soil Nitrogen Ecology written by Cristina Cruz and has been published by Springer Nature this book supported file pdf, txt, epub, kindle and other format this book has been release on 2021-05-24 with Science categories.
This book highlights the latest discoveries about the nitrogen cycle in the soil. It introduces the concept of nitrogen fixation and covers important aspects of nitrogen in soil and ecology such as its distribution and occurrence, soil microflora and fauna and their role in N-fixation. The importance of plant growth-promoting microbes for a sustainable agriculture, e.g. arbuscular mycorrhizae in N-fixation, is discussed as well as perspectives of metagenomics, microbe-plant signal transduction in N-ecology and related aspects. This book enables the reader to bridge the main gaps in knowledge and carefully presents perspectives on the ecology of biotransformations of nitrogen in soil.
Research On Nitrification And Related Processes Part B
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Author :
language : en
Publisher: Academic Press
Release Date : 2011-06-15
Research On Nitrification And Related Processes Part B written by and has been published by Academic Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2011-06-15 with Science categories.
The global nitrogen cycle is the one most impacted by mankind. The past decade has changed our view on many aspects of the microbial biogeochemical cycles, including the global nitrogen cycle, which is mainly due to tremendous advances in methods, techniques and approaches. Many novel processes and the molecular inventory and organisms that facilitate them have been discovered only within the last 5 to 10 years, and the process is in progress. Research on Nitrification and Related Processes, Part B provides state-of-the-art updates on methods and protocols dealing with the detection, isolation and characterization of macromolecules and their hosting organisms that facilitate nitrification and related processes in the nitrogen cycle as well as the challenges of doing so in very diverse environments. Provides state-of-the-art update on methods and protocols Deals with the detection, isolation and characterization of macromolecules and their hosting organisms Deals with the challenges of very diverse environments
Biology Of The Nitrogen Cycle
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Author : Hermann Bothe
language : en
Publisher: Elsevier
Release Date : 2007
Biology Of The Nitrogen Cycle written by Hermann Bothe and has been published by Elsevier this book supported file pdf, txt, epub, kindle and other format this book has been release on 2007 with categories.
Nitrogen Cycling In Bacteria
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Author : James W. B. Moir
language : en
Publisher: Caister Academic Press Limited
Release Date : 2011
Nitrogen Cycling In Bacteria written by James W. B. Moir and has been published by Caister Academic Press Limited this book supported file pdf, txt, epub, kindle and other format this book has been release on 2011 with Science categories.
This book aims to provide comprehensive reviews of current nitrogen cycle research and to give a broader perspective on the state of our understanding of this key biogeochemical cycle. With contributions from expert authors from around the world, topics covered include: the archaean N-cycle; redox complexes N-cycle; organisation of respiratory chains in N-cycle processes; Mo-nitrogenase; nitrogen assimilation in bacteria; alternative routes to dinitrogen; nitrite and nitrous oxide reductases; assembly of respiratory proteins; nitric oxide metabolism; denitrification in legume-associated endosymbiotic bacteria; nitrous oxide production in the terrestrial environment; bacterial nitrogen cycling in humans.
Microbial Nitrogen Cycling Dynamics In Coastal Systems
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Author : Annika Carlene Mosier
language : en
Publisher:
Release Date : 2011
Microbial Nitrogen Cycling Dynamics In Coastal Systems written by Annika Carlene Mosier and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2011 with categories.
Human influence on the global nitrogen cycle (e.g., through fertilizer and wastewater runoff) has caused a suite of environmental problems including acidification, loss of biodiversity, increased concentrations of greenhouse gases, and eutrophication. These environmental risks can be lessened by microbial transformations of nitrogen; nitrification converts ammonia to nitrite and nitrate, which can then be lost to the atmosphere as N2 gas via denitrification or anammox. Microbial processes thus determine the fate of excess nitrogen and yet recent discoveries suggest that our understanding of these organisms is deficient. This dissertation focuses on microbial transformations of nitrogen in marine and estuarine systems through laboratory and field studies, using techniques from genomics, microbial ecology, and microbiology. Recent studies revealed that many archaea can oxidize ammonia (AOA; ammonia-oxidizing archaea), in addition to the well-described ammonia-oxidizing bacteria (AOB). Considering that these archaea are among the most abundant organisms on Earth, these findings have necessitated a reevaluation of nitrification to determine the relative contribution of AOA and AOB to overall rates and to determine if previous models of global nitrogen cycling require adjustment to include the AOA. I examined the distribution, diversity, and abundance of AOA and AOB in the San Francisco Bay estuary and found that the region of the estuary with low-salinity and high C:N ratios contained a group of AOA that were both abundant and phylogenetically distinct. In most of the estuary where salinity was high and C:N ratios were low, AOB were more abundant than AOA--despite the fact that AOA outnumber AOB in soils and the ocean, the two end members of an estuary. This study suggested that a combination of environmental factors including carbon, nitrogen, and salinity determine the niche distribution of the two groups of ammonia-oxidizers. In order to gain insight into the genetic basis for ammonia oxidation by estuarine AOA, we sequenced the genome of a new genus of AOA from San Francisco Bay using single cell genomics. The genome data revealed that the AOA have genes for both autotrophic and heterotrophic carbon metabolism, unlike the autotrophic AOB. These AOA may be chemotactic and motile based on numerous chemotaxis and motility-associated genes in the genome and electron microscopy evidence of flagella. Physiological studies showed that the AOA grow aerobically but they also oxidize ammonia at low oxygen concentrations and may produce the potent greenhouse gas N2O. Continued cultivation and genomic sequencing of AOA will allow for in-depth studies on the physiological and metabolic potential of this novel group of organisms that will ultimately advance our understanding of the global carbon and nitrogen cycles. Denitrifying bacteria are widespread in coastal and estuarine environments and account for a significant reduction of external nitrogen inputs, thereby diminishing the amount of bioavailable nitrogen and curtailing the harmful effects of nitrogen pollution. I determined the abundance, community structure, biogeochemical activity, and ecology of denitrifiers over space and time in the San Francisco Bay estuary. Salinity, carbon, nitrogen and some metals were important factors for denitrification rates, abundance, and community structure. Overall, this study provided valuable new insights into the microbial ecology of estuarine denitrifying communities and suggested that denitrifiers likely play an important role in nitrogen removal in San Francisco Bay, particularly at high salinity sites.