Cobalt Biogeochemistry in the Atlantic Ocean Using Flow Injection-chemiluminescence
Author: Rachel Ursula Shelley
Publisher:
Published: 2011
Total Pages:
ISBN-13:
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Author: Rachel Ursula Shelley
Publisher:
Published: 2011
Total Pages:
ISBN-13:
DOWNLOAD EBOOKAuthor: Mak A. Saito
Publisher:
Published: 2001
Total Pages: 832
ISBN-13:
DOWNLOAD EBOOKProcesses that enable marine phytoplankton to acquire trace metals are fundamental to our understanding of primary productivity and global carbon cycling. This thesis explored the biogeochemistry of cobalt using analytical chemistry and physiological experiments with the dominant phytoplankton species, Prochlorococcus. A high sensitivity method for Co speciation was developed using hanging mercury drop cathodic stripping voltammetry. Dissolved Co at the Bermuda Atlantic Time Series station (BATS) in the Sargasso Sea was bound by strong organic complexes with a conditional stability constant of logK=16.3 +/- 0.9. Biweekly time series measurements of total cobalt near Bermuda from the MITESS sampler were 0-47pM throughout 1999, and averaged 20 +/- 10pM in 1999. A transect of total cobalt from BATS to American coastal waters ranged from 19-133pM and correlated negatively with salinity (r(sup 2)=0.93). Prochlorococcus strains MED4-Ax and SS120 showed an absolute requirement for Co, despite replete Zn. Co-57 uptake rates and growth rates were enhanced by additions of filtered low Co cultures, suggesting that a ligand is present that facilitates Co uptake. Co-limited Prochlorococcus cultures exhibited an increase in the fraction of cells in G2 relative to other cell cycle stages during exponential growth, and the durations of this stage increased with decreasing cobalt concentrations.
Author: Tong Lee
Publisher: Frontiers Media SA
Published: 2020-12-31
Total Pages: 867
ISBN-13: 2889631206
DOWNLOAD EBOOKThis eBook is a collection of articles from a Frontiers Research Topic. Frontiers Research Topics are very popular trademarks of the Frontiers Journals Series: they are collections of at least ten articles, all centered on a particular subject. With their unique mix of varied contributions from Original Research to Review Articles, Frontiers Research Topics unify the most influential researchers, the latest key findings and historical advances in a hot research area! Find out more on how to host your own Frontiers Research Topic or contribute to one as an author by contacting the Frontiers Editorial Office: frontiersin.org/about/contact.
Author: Neil Wyatt
Publisher:
Published: 2014
Total Pages:
ISBN-13:
DOWNLOAD EBOOKAuthor: Tamara Garcia Barrera
Publisher: CRC Press
Published: 2017-07-12
Total Pages: 369
ISBN-13: 148226451X
DOWNLOAD EBOOKMarine environment can be affected by several pollutants such as the presence of elements and their chemical species, pharmaceuticals, nanoparticles and other emerging contaminants. Environmental monitoring can be assessed by genomics, proteomics (i.e. redox proteomics), chemical speciation analysis and metallomics, metabolomics as well as other advanced strategies. The present book is a useful methodological tool for researchers and specialists in the field of analytical chemistry, environmental sciences, biochemistry, genomics and toxicology. The book includes for the first time the methodological aspects and applications related to chemical speciation and –omics strategies applied to marine environment.
Author: Vincenzo Cannizzaro
Publisher:
Published: 2001
Total Pages: 0
ISBN-13:
DOWNLOAD EBOOKAuthor: Kristen N. Buck
Publisher: Frontiers Media SA
Published: 2018-01-11
Total Pages: 305
ISBN-13: 2889453766
DOWNLOAD EBOOKThis research topic highlights the most recent accomplishments of a Scientific Committee on Oceanic Research (SCOR) Working Group, SCOR WG 139: Organic Ligands - A Key Control on Trace Metal Biogeochemistry in the Ocean.
Author: I.S. Krull
Publisher: Elsevier
Published: 1991-10-08
Total Pages: 319
ISBN-13: 0080858546
DOWNLOAD EBOOKThe aim of this volume is to describe the most recent advances in areas of analytical chemistry that relate to the trace determination of metals and inorganics, as well as their distribution and forms (species) present, sample dependent. Analytical approaches are described that encompass a number of separation methods, such as gas and high performance liquid chromatography, interfaced with selective and sensitive detection methods that become unique for metal species/forms present in various samples. Hyphenated techniques are emphasized, such as interfacing HPLC with plasma induced emission spectroscopy, electrochemistry, post-column reaction chemistry, etc. Each chapter describes the latest instrumental and methodology advances that utilize some form of chromatography together with element-specific detection or mass spectrometry to provide absolute identification of the specific species of a metal present in various samples. The book will be of value to those concerned with the determination of trace levels of individual metal species present or suspected present in any given sample and to those involved in trace metal toxicology, metabolism of metal-containing drugs or chemicals, environmental exposures to metals and chemical speciation of real world samples. Government regulatory laboratories striving to detect and determine absolute levels of a metal species in any regulated sample will be interested in this volume, as will academic institutes involved in environmental toxicology, environmental chemistry, metal-DNA/protein interactions and researchers working with metal species.
Author: Oliver Wurl
Publisher: CRC Press
Published: 2009-06-09
Total Pages: 404
ISBN-13: 1420073079
DOWNLOAD EBOOKAs we discover more about the role of the ocean in global changes and identify the effects of global change on the ocean, understanding its chemical composition and processes becomes increasingly paramount. However, understanding these processes requires a wide range of measurements in the vast ocean, from the sea surface to deep-ocean trenches, fr
Author: Elias A. G. Zagatto
Publisher: Elsevier
Published: 2012-01-05
Total Pages: 483
ISBN-13: 0123859247
DOWNLOAD EBOOKMachine generated contents note: 1. Introduction 2. Historical view 3. Fundamentals 4. Interaction of radiation with the flowing sample 5. Flow analysers 6. Instrumentation 7. Special strategies for flow manipulation 8. Sample handling.