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- W1966524221 abstract "The feeding activity of soil-feeding termites is considered an important factor in the turnover of soil organic matter in tropical ecosystems, but the nature of the components exploited as carbon and energy source and the consequences of the gut passage for the residual fraction are still largely obscure. In order to determine mineralization rates of specific components in feeding experiments, we prepared 14C-labeled synthetic humic model compounds by peroxidase-initiated radical polymerization of a mixture of phenolic compounds, peptides, amino acids, and carbohydrates. A general characterization of the polymerization products showed that they resembled natural humic substances prepared from tropical soil used in feeding trials with soil-feeding termites in their elemental content, infrared spectra, and molecular weight distribution. Solubility-based fractionation of chemically identical preparations, arising from selective labeling of different precursors, revealed that almost all of the label stemming from the protein precursors and approximately two-thirds stemming from the peptone and catechol precursors were recovered in the humic acid fraction. In contrast, the label of glucose or glycine was recovered almost completely in the acid-soluble fraction. High-performance gel-permeation chromatography (HP-GPC) of the humic and fulvic acid fractions combined with online radiotracer analysis showed large differences in the size distribution of the radiolabel, which depended strongly on the chemical nature of labeled precursor." @default.
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- W1966524221 date "2000-08-01" @default.
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- W1966524221 title "Synthesis and characterization of specifically 14C-labeled humic model compounds for feeding trials with soil-feeding termites" @default.
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- W1966524221 doi "https://doi.org/10.1016/s0038-0717(00)00047-x" @default.
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