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Influence Of Protozoan Grazing On The Marine Geochemistry Of Particle Reactive Trace Metals
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Book Synopsis Influence of Protozoan Grazing on the Marine Geochemistry of Particle Reactive Trace Metals by : Katherine Barbeau
Download or read book Influence of Protozoan Grazing on the Marine Geochemistry of Particle Reactive Trace Metals written by Katherine Barbeau and published by . This book was released on 1998 with total page 265 pages. Available in PDF, EPUB and Kindle. Book excerpt: "This thesis examines the effect of intracellular digestion by phagotrophic organisms (protozoan grazers) on the solid/liquid partitioning and speciation of strongly hydrolyzed, particle-reactive trace metals, including Fe and Th. A series of experiments was carried Out in model systems in order to determine the effect of grazer-mediated transformations on trace metals associated with cellular phases. Principle findings included mobilization of extracellular as well as intracellular trace metals by protists, apparent generation of metal-organic complexes, and decoupling of metal and carbon cycling. Studies of the effect of grazers on colloidal iron oxide (ferrihydrite) indicated that protozoan grazing can increase the dissolution rate of iron oxide phases through phagotrophic ingestion. As part of this work a novel tracer technique was 133 developed, based on the synthesis of colloidal ferrihydrite impregnated with Ba-133 as an inert tracer. This technique was shown to be a sensitive indicator for the extent of ferrihydrite dissolution/alteration by a variety of mechanisms. Using this technique, grazing by natural protistan assemblages was shown to enhance the dissolution rate of colloidal ferrihydrite over that in non-grazing controls. when integrated temporally over the euphotic zone, protozoan grazing may equal or exceed photoreduction as a pathway for iron oxide dissolution. ." -- Stinet.
Book Synopsis Influence of Protozoan Grazing on the Marine Geochemistry of Particule Reactive Trace Metals by :
Download or read book Influence of Protozoan Grazing on the Marine Geochemistry of Particule Reactive Trace Metals written by and published by . This book was released on 1998 with total page 265 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Role of Protozoan Grazing in the Fate and Transport of Particle Reactive Trace Elements in the Marine Environment by :
Download or read book Role of Protozoan Grazing in the Fate and Transport of Particle Reactive Trace Elements in the Marine Environment written by and published by . This book was released on 1997 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The goal was to determine the importance of protozoan grazing on the fate and transport of particle reactive elements, by studying the chemical transformations of particulate metals when ingested by protozoan grazers. These goals were established based on previous work which had shown the importance of protozoans in marine ecosystems, and their role in ingesting particles in the 0.2 to 2 micron size class range - an important reservoir of particulate metals and contaminants in seawater. We anticipated that the grazing process would create a chemical microenvironment where many processes would be accelerated relative to bulk seawater. This project was an AASERT Award and was the dissertation research of Katherine A. Barbeau, MIT/WHOI Joint Program.
Book Synopsis The Effect of Protozoan Grazers on the Cycling of Polychlorinated Biphenyls (PCBs) in Marine Systems by : Elizabeth B. Kujawinski
Download or read book The Effect of Protozoan Grazers on the Cycling of Polychlorinated Biphenyls (PCBs) in Marine Systems written by Elizabeth B. Kujawinski and published by . This book was released on 2000 with total page 734 pages. Available in PDF, EPUB and Kindle. Book excerpt: (Cont.) surface-active material in ciliate cultures was significantly higher than in flagellate cultures, and all protozoan cultures were higher than the bacterial control. Common headspace vessels were then used to compare and contrast the affinity of protozoan and bacterial culture filtrates (
Book Synopsis Dissertation Abstracts International by :
Download or read book Dissertation Abstracts International written by and published by . This book was released on 2000 with total page 426 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Cell Cycle Dynamics and the Physiology of Saxitoxin Biosynthesis in Alexandrium Fundyense (Dinophyceae) by : Gaspar Taroncher Oldenburg
Download or read book Cell Cycle Dynamics and the Physiology of Saxitoxin Biosynthesis in Alexandrium Fundyense (Dinophyceae) written by Gaspar Taroncher Oldenburg and published by . This book was released on 1998 with total page 738 pages. Available in PDF, EPUB and Kindle. Book excerpt: Marine dinoflagellates in the genus Alexandrium synthesize Saxitoxin (STX) and several of its derivatives. The aim of this thesis was to analyze novel aspects of toxigenesis and the cell cycle in Alexandrium and to apply molecular techniques to gain new insights on the regulation of STX biosynthesis. Synchronized cultures of A. fundyense were studied to determine the dynamics of toxin production throughout the cell cycle. STX biosynthesis was shown to be discontinuous and constrained to approximately 10 hours at the beginning of G1. Two cell cycle transition points were identified: a light-dependent one and a size-dependent one. Semi-continuous cultures of A. fundyense were used to determine the effects of temperature and phosphate limitation on the coupling of STX biosynthesis to O%. Inferred toxin production rates were constant and correlated to G1 over a range of growth rates. The effects of phosphate on STX biosynthesis were analyzed and a scheme of interconversions among STX derivatives is proposed. Differential Display (DD) analysis was applied to the identification of up- or downregulated genes during toxigenesis in A. fundyense. The expression patterns of S-adenosylhomocysteine hydrolase, methionine aminopeptidase and a histone-like protein were related to periods of STX biosynthesis.
Book Synopsis The Biogeochemistry of Iron in Seawater by : David R. Turner
Download or read book The Biogeochemistry of Iron in Seawater written by David R. Turner and published by John Wiley & Sons. This book was released on 2001-11-28 with total page 426 pages. Available in PDF, EPUB and Kindle. Book excerpt: Intensive research carried out during the 1990's (known as the "Iron Age of Oceanography") provided a wealth of new information and this title, written by acknowledged experts and reviewed by international specialists, provides the authoritative and comprehensive review of the subject area. A joint venture between SCOR and IUPAC, it expertly addresses the current state of knowledge of the biogeochemistry of iron in seawater and covers: * Chemical speciation * Analytical techniques * Transformation of iron * It includes evidence for iron limitation of primary production of High Nutrient Low Chlorophyll (HNLC) areas in the ocean * Structured into a series of chapters it has been reviewed by international specialists- SCOR (Scientific Committee for Ocean Research) and IUPAC (International Union for Pure and Applied Chemistry) * The final chapter summarises the conclusions of the book and discusses the priorities for future research * Ideal for scientists studying the environmental impact of metals and their role in marine ecosystems; Marine Scientists and Oceanographers; Environmental Analytical Chemists
Book Synopsis Annual Report by : Woods Hole Oceanographic Institution
Download or read book Annual Report written by Woods Hole Oceanographic Institution and published by . This book was released on 1994 with total page 322 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Biological/Chemical Oceanography Program Abstract Book by :
Download or read book Biological/Chemical Oceanography Program Abstract Book written by and published by . This book was released on 1995 with total page 512 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis American Doctoral Dissertations by :
Download or read book American Doctoral Dissertations written by and published by . This book was released on 1999 with total page 848 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Direct and Indirect Photoreactions of Chromophoric Dissolved Organic Matter by : Jared Verrill Goldstone
Download or read book Direct and Indirect Photoreactions of Chromophoric Dissolved Organic Matter written by Jared Verrill Goldstone and published by . This book was released on 2002 with total page 278 pages. Available in PDF, EPUB and Kindle. Book excerpt: Photochemical transformations of chromophoric dissolved organic matter (CDOM) are one of the principal processes controlling its fate in coastal waters. The photochemical decomposition of CDOM leads to the formation of a variety of biologically available carbon substrates. Photomineralization of CDOM to dissolved inorganic carbon may constitute a significant flux in the global carbon cycle. Photoreactions ultimately lead to the destruction of the chromophores and hence to the loss of absorption and fluorescence (bleaching), thus acting as a sink for CDOM. Photodecomposition may proceed both via direct photochemical reactions, following absorption of photons by CDOM, or via indirect processes, involving DOM reactions with photochemically generated intermediates such as reactive oxygen species (ROS). The reactions of CDOM with two important ROS, superoxide (02- ) and hydroxyl radical (OH), have different consequences. Superoxide reactions with CDOM did not appear to degrade the CDOM. Instead, CDOM catalysed the dismutation of 02- to 02 and HOOH. This reactivity has the effect of limiting the steady-state concentration of 02- in most coastal waters. In contrast, reactions of CDOM with radiolytically produced OH formed CO2 and several low molecular weight carboxylic acids, as well as bleached both the absorption and fluorescence at slow rates. These reactions did not increase the bioavailability of this material to a microbial consortium. Both direct and indirect photochemical processes are expected to be accelerated by the presence of iron.
Book Synopsis Applied and Environmental Microbiology by :
Download or read book Applied and Environmental Microbiology written by and published by . This book was released on 2000 with total page 974 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Organic Ligands in Marine Trace Metal Biogeochemistry by : Kristen N. Buck
Download or read book Organic Ligands in Marine Trace Metal Biogeochemistry written by Kristen N. Buck and published by Frontiers Media SA. This book was released on 2018-01-11 with total page 305 pages. Available in PDF, EPUB and Kindle. Book excerpt: This 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.
Book Synopsis Freshwater Microplastics by : Martin Wagner
Download or read book Freshwater Microplastics written by Martin Wagner and published by Springer. This book was released on 2017-11-21 with total page 309 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is open access under a CC BY 4.0 license. This volume focuses on microscopic plastic debris, also referred to as microplastics, which have been detected in aquatic environments around the globe and have accordingly raised serious concerns. The book explores whether microplastics represent emerging contaminants in freshwater systems, an area that remains underrepresented to date. Given the complexity of the issue, the book covers the current state-of-research on microplastics in rivers and lakes, including analytical aspects, environmental concentrations and sources, modelling approaches, interactions with biota, and ecological implications. To provide a broader perspective, the book also discusses lessons learned from nanomaterials and the implications of plastic debris for regulation, politics, economy, and society. In a research field that is rapidly evolving, it offers a solid overview for environmental chemists, engineers, and toxicologists, as well as water managers and policy-makers.
Book Synopsis Environmental Geochemistry of Potentially Toxic Metals by : Frederic R. Siegel
Download or read book Environmental Geochemistry of Potentially Toxic Metals written by Frederic R. Siegel and published by Springer Science & Business Media. This book was released on 2013-11-11 with total page 240 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Oceanic Abstracts written by and published by . This book was released on 1996-10 with total page 1002 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Biogeochemistry of Marine Dissolved Organic Matter by : Dennis A. Hansell
Download or read book Biogeochemistry of Marine Dissolved Organic Matter written by Dennis A. Hansell and published by Academic Press. This book was released on 2014-10-02 with total page 712 pages. Available in PDF, EPUB and Kindle. Book excerpt: Marine dissolved organic matter (DOM) is a complex mixture of molecules found throughout the world's oceans. It plays a key role in the export, distribution, and sequestration of carbon in the oceanic water column, posited to be a source of atmospheric climate regulation. Biogeochemistry of Marine Dissolved Organic Matter, Second Edition, focuses on the chemical constituents of DOM and its biogeochemical, biological, and ecological significance in the global ocean, and provides a single, unique source for the references, information, and informed judgments of the community of marine biogeochemists. Presented by some of the world's leading scientists, this revised edition reports on the major advances in this area and includes new chapters covering the role of DOM in ancient ocean carbon cycles, the long term stability of marine DOM, the biophysical dynamics of DOM, fluvial DOM qualities and fate, and the Mediterranean Sea. Biogeochemistry of Marine Dissolved Organic Matter, Second Edition, is an extremely useful resource that helps people interested in the largest pool of active carbon on the planet (DOC) get a firm grounding on the general paradigms and many of the relevant references on this topic. Features up-to-date knowledge of DOM, including five new chapters The only published work to synthesize recent research on dissolved organic carbon in the Mediterranean Sea Includes chapters that address inputs from freshwater terrestrial DOM
