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The influence of circulation frequency on fungal morphology: A case study considering Kolmogorov microscale in constant specific energy dissipation rate cultures of Trichoderma harzianum

Paper ID Volume ID Publish Year Pages File Format Full-Text
25193 43559 2007 8 PDF Available
Title
The influence of circulation frequency on fungal morphology: A case study considering Kolmogorov microscale in constant specific energy dissipation rate cultures of Trichoderma harzianum
Abstract

The energy dissipation/circulation function (EDCF) is the product of the specific energy dissipation rate in the impeller swept volume (P/kD3) and the frequency of particle circulation (1/tc) through that volume. A direct relationship between mycelial fragmentation and EDCF has been reported. However, and although hyphal fragmentation is assumed to occur by hyphae-eddy interaction, Kolmogorov microscale (λ) has not been shown to determine, at least directly, fungal morphology. In this work we studied the influence of λ and EDCF evolution, as well as the individual effects of P/kD3 and 1/tc, on Trichoderma harzianum cultures in an attempt to elucidate the mechanistic interactions between parameters. T. harzianum cultures, conducted at equivalent yielding P/kD3 conditions, were developed using two different Rushton turbines diameter sets. For the studied conditions, 1/tc had a greater effect over mycelial clump size and growth rate than P/kD3. Consequently, broth viscosity, and hence Kolmogorov microscale, was a function of impeller diameter, even among cultures operated at equivalent specific energy dissipation rates. The latter could partially explain why Kolmogorv's theory has not been able to fully correlate morphological data, and highlights the importance of 1/tc on fungal bioprocesses. A theoretical approach to monitor λ in large-scale bioreactors is proposed.

Keywords
Circulation frequency; Energy dissipation/circulation function (EDCF); Fungal morphology; Kolmogorov microscale; Trichoderma harzianum
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The influence of circulation frequency on fungal morphology: A case study considering Kolmogorov microscale in constant specific energy dissipation rate cultures of Trichoderma harzianum
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Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Biotechnology - Volume 130, Issue 4, 15 July 2007, Pages 394–401
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us