Graduate Thesis Or Dissertation
 

Free amino acids in cultured higher marine fungi

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  • The free amino acid content of the intracellular pools in higher marine fungi was determined by thin-layer and gas-liquid chromatography. The organisms investigated include: Ascomycetes; Nais inornata, Leptosphaeria oraemaris, Corollospora maritima, Haligena elaterophora, Halosphaeria mediosetigera, Halosphaeria appendiculata, Halosphaeria quadriremis, Lignincola Laervis and Remispora hamata, and Fungi Imperfecti; Zalerion maritimum and Culcitalna archraspora. All organisms investigated were found to contain: alanine, glycine, valine, proline, leucine, isoleucine, serine, threonine, hydroxyproline, aspartic acid, glutamic acid, methionine, phenylalanine, ornithine, lysine, tyrosin, tryptophan, cystine, cysteine and histidine. The widespread occurrence of hydroxyproline is of particular interest. This compound was identified in all species examined and since it has been reported to occur only rarely in terrestrial fungi, it may have chemotaxonomical value in delineating obligate marine fungi from terrestrial forms. The detection of hydroxyproline was considered in light of the experimental procedures employed. The use of water as the extracting solvent, a long extraction period (48 hours) and two different analytical procedures facilitated the identification of the compound. The role of fungi in the chemical ecology of the marine environment was considered.
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