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- W2069105072 abstract "A study of the microfungi in two forest soils containing P-type humic acids was carried out to examine their possible contribution to the accumulation of humic substances in soils. A total of 23 fungal species was identified, but only Acremonium fusidioides, Cladosporium herbarum, Geomyces pannorum, Oidiodendron tenuissimum. Penicillium citrinum, Torulomyces humicola and Trichoderma harzianum synthesized acid-insoluble pigments with possible chemical similarity to soil humic acids. Amongst them, the formation of the green pigment characteristic of P-type humic acids was demonstrated only in C. herbarum. The analytical characteristics of the melanins of C. herbarum and O. tenuissimum suggested that these fungal polymers tend to accumulate in the soil humic fraction, in spite of the abundance of biodegradable materials. Successive oxidative degradation with potassium persulphate followed by alkaline permanganate oxidation of the residue was carried out on the melanin from C. herbarum. It showed that polymers from this fungus yielded similar products to those obtained from humic acids. Among the degradation products, the aliphatic compounds were dominant, mainly consisting of fatty acids with a different pattern to that found in the free lipid fraction, while the aromatic compounds were mainly benzenecarboxylic acids." @default.
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- W2069105072 date "1989-01-01" @default.
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- W2069105072 title "Contribution by pigmented fungi to P-type humic acid formation in two forest soils" @default.
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