Hyphae growth rate

Aspergillus nidulans (biA-1 sorA-2) germination time and hyphae growth rate as a function of NMR and NMR T2 relaxation times of cellulose (c), sorbose (s), and orange serum broth solids with different s c ratios at 25°C. (Source From Brown, D. and Rothery, P. Models in Biology-Mathematics, Statistics and Computing, Wiley, Chichester, UK, 1993. With permission.)... 

The different dependence of k and /c2 s is shown in Fig. 5.37. With increasing s, the density of the colonies, which depends on the branching rate /c25 decreases faster than the radial growth rate this can be interpreted in connection with the regulation of transport of metabolites within the hyphae. Cellular differentiation and the connection to product formation in molds was elaborated from Megee et al. (1970). 

The deceleration of growth as X approaches X g could be due to nutrient hmitations, accumulation of inhibitory products, or maximum packing densities based on steric hmitations [91] although in practice the value of X ax is usually simply taken directly from experimental biomass profiles. Note that Pniax is also typically determined empirically. However, with the assumption that each fungal hypha branches to give identical daughter hyphae which extend at the same rate as the mother hypha, these macroscopic parameters can be related to microscopic parameters such as hyphal branching frequencies and hyphal extension rates [92,93]. 

Under conditions which abruptly reduce the growth of the hyphae, but provide the cultures with a steady level of nutrients (exchange of the original nutrient solution by a diluted solution with limited phosphate content) the rates of alkaloid production increase further even when the in vitro measurable enzyme activities have reached maximum values (Pig. 3). This additional increase is immediately stopped by inhibitors of... 

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