Abstract
Despite the considerable industrial importance of filamentous fungi there have been very few attempts to model the complex growth process of these microorganisms. With a new generation of high performance, computerized bioreactors and new analytical techniques it is possible to obtain the necessary experimental data for setting up reliable structured models describing the growth process of filamentous fungi. It is therefore interesting to review the mathematical models described previously in the literature and the experimental data on which these models are built. Only structured models are considered due to the complex metabolism of filamentous fungi and to the natural cellular structuring of the biomass, i.e. the biomass can be divided into different cell types.
In order to set up good structured models it is strictly necessary to have a detailed knowledge of the mechanisms underlying the growth process. This involves both biochemical insight and understanding of the interactions between different macromolecules and cytological organelles.
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Abbreviations
- b:
-
breakage function (hyphal elements formed per m3 per h)
- d:
-
hypha diameter (m)
- D:
-
dilution rate in the bioreactor (h−1)
- eL :
-
column vector of dimension L with all elements being 1
- k:
-
rate constant (h−1)
- K:
-
saturation constant (kg per kg DW)
- Ihgu :
-
hyphal growth unit length (m per tip)
- m:
-
mass of hyphal element (kg)
- M:
-
diagonal matrix containing the specific growth rates of the morphological forms (h−1)
- n:
-
average number of tips in a hyphal element
- r:
-
specific rate vector for intracellular reactions (h−1)
- r tip :
-
tip extension rate (kg DW per tip per h)
- rx :
-
biomass formation rate (kg DW m−3 h−1)
- rv :
-
specific rate of increase in the wall area (m2 h−1)
- rvsc :
-
rate of displacement of the VSC (m h−1)
- R:
-
pellet radius (m)
- s:
-
extracellular substrate concentration (kg m−3)
- S:
-
intracellular substrate concentration (kg per kg DW)
- u:
-
diagonal matrix containing the rate of metamorphosis reactions (h−1)
- Vhgu :
-
hyphal growth unit volume (m3 per tip)
- w:
-
water content in the cells (kg per kg biomass)
- x:
-
biomass concentration (kg DW m−3)
- xhgu :
-
hyphal growth unit mass (kg DW per tip)
- X:
-
intracellular concentration vector (kg per kg DW)
- Yij :
-
stoichiometric coefficients (mole j (mole i)−1)
- zsk :
-
distance between apex and position of the VSC
- Z:
-
fractional concentration vector of morphological forms (kg per kg DW)
- α:
-
stoichiometric coefficients for the substrate
- δ:
-
stoichiometric coefficients in the metamorphosis reactions
- Δ:
-
matrix containing the stoichiometric coefficients δ
- Γ:
-
matrix containing the stoichiometric coefficients in the intracellular reactions
- É›:
-
number of hyphal elements
- μ:
-
specific growth rate (h−1)
- Ï•:
-
branching frequency (tips formed per h)
- ϱ:
-
cell density (kg m−3)
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Nielsen, J. (1992). Modelling the growth of filamentous fungi. In: Modern Biochemical Engineering. Advances in Biochemical Engineering/Biotechnology, vol 46. Springer, Berlin, Heidelberg. https://doi.org/10.1007/BFb0000711
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DOI: https://doi.org/10.1007/BFb0000711
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