Since the effective diffusion coefficient of the ions into the wood can be expressed by the diffusion coefficient in
water multiplied by the ECCSA (Inalbon et al. 20111), the increase found in ECCSA shows that the transport
capacity of the wood has been improved. This means that the liquid uptake and ions diffusion might be easier. This
is important for wood impregnation with liquor in the pulping process due to the increase in ECCSA would facilitate
the uptake of liquor, which might have a positive impact in the impregnation time. Since the main way used by fungi
in wood colonizing is longitudinal one (Luna et al. 2012), which not analyzed for ECCSA determination in the
present study, the increase found in the radial ECCSA might indicate that fungi seems prefer radial direction to
tangential one. This might respond to the nutritional requirements of the fungi needed for their establishment in
wood and vigorous growth. In parenchymal tissues (radial cells), the availability of carbon sources and other
nutrients is greater than in empty axial cells. Previously, Boddy and Rayner (1983) reported the importance of
availability of organic nutrients and their distribution as a main factor affecting growth of fungi in wood. In this
sense, readily accessible, assimilable substrates for fungal growth such as soluble sugars, lipids, peptides and other
primary metabolites, which occur in relatively small amounts (< 10% by dry weight) are located almost exclusively
within wood parenchyma (Boddy and Rayner, 1983).
Fig.7:
Since the effective diffusion coefficient of the ions into the wood can be expressed by the diffusion coefficient inwater multiplied by the ECCSA (Inalbon et al. 20111), the increase found in ECCSA shows that the transportcapacity of the wood has been improved. This means that the liquid uptake and ions diffusion might be easier. Thisis important for wood impregnation with liquor in the pulping process due to the increase in ECCSA would facilitatethe uptake of liquor, which might have a positive impact in the impregnation time. Since the main way used by fungiin wood colonizing is longitudinal one (Luna et al. 2012), which not analyzed for ECCSA determination in thepresent study, the increase found in the radial ECCSA might indicate that fungi seems prefer radial direction totangential one. This might respond to the nutritional requirements of the fungi needed for their establishment inwood and vigorous growth. In parenchymal tissues (radial cells), the availability of carbon sources and othernutrients is greater than in empty axial cells. Previously, Boddy and Rayner (1983) reported the importance ofavailability of organic nutrients and their distribution as a main factor affecting growth of fungi in wood. In thissense, readily accessible, assimilable substrates for fungal growth such as soluble sugars, lipids, peptides and otherprimary metabolites, which occur in relatively small amounts (< 10% by dry weight) are located almost exclusivelywithin wood parenchyma (Boddy and Rayner, 1983).Fig.7:
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