Read e-book online Aquatic Humic Substances: Ecology and Biogeochemistry PDF

By Dag O. Hessen, Lars J. Tranvik (auth.), Prof. Dr. Dag O. Hessen, Dr. Lars J. Tranvik (eds.)

ISBN-10: 3642083625

ISBN-13: 9783642083624

Humic components ensue in all types of aquatic structures, yet are really vital in northern, coniferous components. They strongly adjust the aquatic ecosystems and in addition represent a massive challenge within the consuming water supply.
This quantity covers all features of aquatic humic components, from their foundation and chemical homes, their results on gentle and nutrient regimes and biogeochemical biking, to their position relating to organisms, productiveness and nutrients internet association from micro organism to fish. specified emphasis is paid to carbon biking and meals net association in humic lakes, yet elements of marine carbon biking concerning humus are taken care of as well.

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Additional resources for Aquatic Humic Substances: Ecology and Biogeochemistry

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Assuming that fulvic acids are not assimilated into bacterial cells, then the loss of carbohydrates would occur through the action of extracellular enzymes. Abiotic photolytic oxidation causes loss of aromatic moieties. The recent age of the fulvic acid does not appear to influence the carbon to nitrogen ratio as much. This implies that the nitrogen incorporated into the fulvic acid molecules, possibly from cell wall proteins, is lost at a similar rate as aromatic and carbohydrate moieties. Although there is much speculation in the above discussion, which is based upon only four samples of microbial/algal origin, we can conclude that the chemical characteristics of the microbial/algal end member are not tightly constrained and that variation in chemical characteristics may be related to the age of the humic substances in the aquatic environment.

References Aiken GR (1985) Isolation and concentration techniques for aquatic humic substances. In: Aiken GR, McKnight DM, Wershaw RL and MacCarthy P (eds) Humic substances in soil, sediment and water: geochemistry, isolation, and characterization, Wiley, New York, pp 363-385 Aiken GR and RL Malcolm (1987) Moleular weight of aquatic fulvic acids by vapor pressure osmometry. Geochim. Cosmochim. Acta 51: 2177 Aiken GR,McKnight DM, Thorn KA, Thurman EM (1992) Isolation of hydrophilic organic acids from water using nonionic macroporous resins.

8. Another possible polymerization reaction is the Malliard reaction involving condensation of amino acids and related substances with reducing sugars; however, this reaction is less likely to occur under water-saturated conditions. Clearly, an important consideration in evaluating these multistage models is timeframe. Are these models consistent with the rate at which humic substances are produced from recently senescent plant and microbial material in aquatic environments? R R phenoloxidase ~ OH OH other phenols, peptides and amino sugars (R-~) HUMIC POLYMERS Fig.

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Aquatic Humic Substances: Ecology and Biogeochemistry by Dag O. Hessen, Lars J. Tranvik (auth.), Prof. Dr. Dag O. Hessen, Dr. Lars J. Tranvik (eds.)

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