Biological Production of Chromophoric Dissolved Organic Matter PDF Download
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Author: Emma J. Rochelle-Newall
Publisher:
ISBN:
Category : Carbon compounds
Languages : en
Pages : 368
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Book Description
Author: Emma J. Rochelle-Newall
Publisher:
ISBN:
Category : Carbon compounds
Languages : en
Pages : 368
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Book Description
Author: Paula G. Coble
Publisher: Cambridge University Press
ISBN: 0521764610
Category : Science
Languages : en
Pages : 407
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Book Description
A core text on principles, laboratory/field methodologies, and data interpretation for fluorescence applications in aquatic science, for advanced students and researchers.
Author: Khan M.G. Mostofa
Publisher: Springer Science & Business Media
ISBN: 3642322239
Category : Science
Languages : en
Pages : 919
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Book Description
Photoinduced processes, caused by natural sunlight, are key functions for sustaining all living organisms through production and transformation of organic matter (OM) in the biosphere. Production of hydrogen peroxide (H2O2) from OM is a primary step of photoinduced processes, because H2O2 acts as strong reductant and oxidant. It is potentially important in many aquatic reactions, also in association with photosynthesis. Allochthonous and autochthonous dissolved organic matter (DOM) can be involved into several photoinduced or biological processes. DOM subsequently undergoes several physical, chemical, photoinduced and biological processes, which can be affected by global warming. This book is uniquely structured to overview some vital issues, such as: DOM; H2O2 and ROOH; HO•; Degradation of DOM; CDOM, FDOM; Photosynthesis; Chlorophyll; Metal complexation, and Global warming, as well as their mutual interrelationships, based on updated scientific results.
Author: Dennis A. Hansell
Publisher: Academic Press
ISBN: 0124071538
Category : Science
Languages : en
Pages : 712
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Book Description
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
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 28
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Book Description
Chromophoric, or colored dissolved organic maller (CDOM), influences the structure of aquatic ecosystems, complicates satellite measurements of ocean productivity, and affects the bioavailability and fate of important trace organic and metal species in seawater. The goals of this project were to chemically characterize biologically produced CDOM components, to characterize CDOM in laboratory algal cultures, and to develop techniques for studying CDOM cycling in seawater. Specifically, we compared the chemical characteristics of freshwater and marine CDOM in the Mississippi River estuary and Gulf of Mexico, characterized CDOM at two open ocean sites (N. Pacific Ocean, Sargasso Sea) and compared CDOM components with CDOM produced by laboratory cultures of marine algae. CDOM was collected by adsorption onto C18 resin from acidified seawater. From this fraction we identified 2,4-dichlorobenzoic acid (2,4-DCBA) and a series of tetrachloro-biphenyl aromatic acids (TCBCAs) that are structurally related to POBs as major components. Structures were determined using proton NMR, gas chromatographylmass spectrometry, and HPLC analyses by co-injection with authentic compounds. High concentrations of chlorinated aromatic acids were found in all seawater samples, but were not found in samples of Mississippi River water. The biological production of 2,4-DCBA and TCBCAs was confirmed by their production in laboratory cultures of the marine algae Emlliana huxleyi and Isochrysis galbana. Spent culture media from these two algae contained up to 500 mug/L 2,4-DCBA and 12 mug/L TCBCAs.
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 0
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Book Description
Colored dissolved organic matter (CDOM) is one of the principal light-attenuating components of seawater. Over the past decade considerable progress has been made in describing the optical properties of CDOM. However, our understanding of CDOM structure and chemistry has not advanced apace, and we do not yet understand many of the factors that introduce and remove CDOM in seawater. Our objectives are to chemically characterize CDOM and to develop techniques for studying CDOM cycling in seawater. Recent work suggests that a large fraction of marine DOM consists of complex carbohydrates and proteins that are produced directly from biosynthesis, yet are biologically refractory towards microbial degradation. Previous studies have also suggested that a large fraction of CDOM is associated with biological activity. We wish to determine if marine phytoplankton and bacteria produce significant quantities of CDOM, and to compare the chemical characteristics of biologically produced CDOM with CDOM in seawater.
Author: Jared Verrill Goldstone
Publisher:
ISBN:
Category : Carbon cycle (Biogeochemistry)
Languages : en
Pages : 278
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Book Description
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.
Author: R.F. WHITEHEAD
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Book Description
Author: Johanna Sjöstedt
Publisher: Frontiers Media SA
ISBN: 2889711021
Category : Science
Languages : en
Pages : 255
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Book Description
Author: Dennis A. Hansell
Publisher: Elsevier
ISBN: 0443138591
Category : Science
Languages : en
Pages : 870
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Book Description
Biogeochemistry of Marine Dissolved Organic Matter, 3rd edition is the most up-to-date revision of the fundamental reference for the biogeochemistry of marine dissolved organic matter. Since its original publication in June 2002, the science, questions, and priorities have advanced, and the editors of this essential guide, have added nine new chapters, including one on the South China Sea. An indispensable manual edited by the most distinguished experts in the field, this book is addressed to graduate students, marine scientists, and all professionals interested in advancing their knowledge of the field. Features up-to-date knowledge on DOM, including 9 new chapters Presents the only published work to synthesize recent research on dissolved organic carbon in the South China, a region receiving a great deal of attention in recent decades Offers contributions by world-class research leaders
