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Job, Daniel
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Job, Daniel
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- PublicationMétadonnées seulementEcological determinants of fungal diversity on deadwood in European forests(2008)
;Kuffer, Nicolas; ;Senn-Irlet, Béatrice; The fine-scale ecological determinants for wood-inhabiting aphyllophoroid basidiomycetes were investigated with statistical analyses of the occurrence of fruit bodies on woody debris collected in Switzerland and Ukraine. Three substrate descriptors were considered: diameter, degree of decomposition to those local environmental descriptors were detected. Three classes for diameter, as well as for degree of decomposition were thus delimited. They revealed the importance of very small sizes, which were not reported in the literature so far: the relevant diameter class limits were about 0.72 cm and 1.35 cm. Within the host tree species, a clear distinction between coniferous and broadleaf species was found. The next splits followed rather climatic determinants of tree distribution than taxonomical entities such as families or genera. The fidelity of the 59 fungal species to diameter classes, decomposition classes and host tree species was measured by the Dufrene-Legendre index and only significant responses after permutation tests were retained. This brought new insights on the ecology of many wood-inhabiting aphyllophoroid basidiomycetes. Redundancy Analysis was applied to investigate the response of fungal species to diameter and degree of decompostion of woody debris from the most common host tree species, Fagus sylvatica. This direct gradient analysis made it possible to reconstruct the succession of fungal species along the wood decomposition process. - PublicationMétadonnées seulement
- PublicationMétadonnées seulement
- PublicationAccès libreExploiting the fungal highway: development of a novel tool for the in situ isolation of bacteria migrating along fungal mycelium(2015)
; ; ; ;Wick, Lukas Y.; ;Kooli, Wafa M. ;Verrecchia, Eric P.Fungi and bacteria form various associations that are central to numerous environmental processes. In the so-called fungal highway, bacteria disperse along fungal mycelium. We developed a novel tool for the in situ isolation of bacteria moving along fungal hyphae as well as for the recovery of fungi potentially involved in dispersal, both of which are attracted towards a target culture medium. We present the validation and the results of the first in situ test. Couples of fungi and bacteria were isolated from soil. Amongst the enriched organisms, we identified several species of fast-growing fungi (Fusarium sp. and Chaetomium sp.), as well as various potentially associated bacterial groups, including Variovorax soli, Olivibacter soli, Acinetobacter calcoaceticus, and several species of the genera Stenotrophomonas, Achromobacter and Ochrobactrum. Migration of bacteria along fungal hyphae across a discontinuous medium was confirmed in most of the cases. Although the majority of the bacteria for which migration was confirmed were also positive for flagellar motility, not all motile bacteria dispersed using their potential fungal partner. In addition, the importance of hydrophobicity of the fungal mycelial surface was confirmed. Future applications of the columns include targeting different types of microorganisms and their interactions, either by enrichment or by state of the art molecular biological methods. - PublicationMétadonnées seulement
- PublicationMétadonnées seulementMedicinal and Edible Mushrooms in Switzerland: Development of Culture Techniques and Pharmacological Research(2001)
; Giovannini, Isabelle - PublicationMétadonnées seulement
- PublicationMétadonnées seulementDegradation of unbleached sulphite pulp paper treated in solid state conditions with five species of the brown-rot Gloeophyllum(1996)
;JobCei, C ;Keller, JWood pulp paper was inoculated with G. abietinum, G. odoratum, G. protractum, G. saepiarium and G. trabeum and incubated in solid state conditions. G. trabeum showed the highest degradation capacity and a clear selectivity towards lignin. The physico-chemical properties of treated pulps showed an incremental increase in brightness in accordance with the fall in Kappa number but breaking length, bursting strength and tearing strength were diminished and the degree of polymerization of cellulose (DP) decreased substantially. We attempted to inhibit cellulose attack, but only EDTA was effective. Under these conditions a clear inhibition in the fall of the DP of cellulose was obtained; the ISO brightness values were increased and Kappa numbers remained near constant in spite of a visible bleaching.