Two parameters are commonly used to compare the growth efficiency of different fungi. One is the exponential growth rate determined from the exponential portion of semi-logarithmic plots of the growth curve:
f log %2 - log Xi A t2 — ti where x1 and x2 are the dry weight in milligrams at time t1 and t2, respectively. The other parameter is the molar growth yield (YG), determined as yield (dry weight of mycelium) per mole of glucose utilized. Shaker-grown mycelia of some thermophilic fungi yield a homogeneous mycelial suspension that is amenable to pipeting, allowing sampling and quantitative measurements of the above parameters. For thermophilic and mesophilic fungi, the specific growth rates were 0.23 h-1 vs. 0.16 to 0.37 h-1, respectively, and the average Yg value was 86 vs. 88 g/mole (Maheshwari et al., 2000). On average, both mesophilic and thermophilic fungi convert approximately 55% of sugar for the synthesis of biomass and 45% for metabolism. This situation is similar to that in thermophilic bacteria.
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