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Colonization of solid particles by Rhizopus oligosporus and Aspergillus oryzae in solid-state fermentation involves two types of penetrative hyphae: A model-based study on how these hyphae grow

Paper ID Volume ID Publish Year Pages File Format Full-Text
2687 126 2016 10 PDF Available
Title
Colonization of solid particles by Rhizopus oligosporus and Aspergillus oryzae in solid-state fermentation involves two types of penetrative hyphae: A model-based study on how these hyphae grow
Abstract

•The first model to describe concentration profiles of penetrative hyphae with depth.•The first mesoscale model to reproduce data of biomass growth in a real SSF system.•The model recognizes that some fungi form two types of penetrative hyphae.•There are long scouting hyphae and shorter vegetative hyphae.•Pressure drop inside the hypha and medium firmness may limit hyphal length.

Among all hyphal types formed on substrate particles during solid-state fermentation, penetrative hyphae are the least studied. Important questions regarding penetrative hyphae remain to be answered: for example, what determines the final length of a penetrative hypha and why do some fungi produce two types of penetrative hyphae, long and short penetrative hyphae? In this work, we develop a discrete model to describe the biomass distribution of penetrative hyphae as a function of depth inside solid particles and apply this model to Rhizopus oligosporus and Aspergillus oryzae, growing in different media. We use our model to suggest different modes of growth and roles for long and short penetrative hyphae: the long ones, also called scouting hyphae, explore the composition of the particle and search for new colonization sites across the particle, while the short hyphae, also called vegetative hyphae, act as anchors for the colony and as enzyme producers. The same factors, namely the firmness of the solid particle and the pressure drop inside the hypha, may determine the final hyphal length of both hyphae. Scouting hyphae may be longer due to a lower pressure drop along the hypha. These hypotheses regarding growth of penetrative hyphae now require experimental investigation.

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Keywords
Modelling; Filamentous fungi; Solid-state fermentation; Physiology; Penetrative hyphae; Discrete model
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Colonization of solid particles by Rhizopus oligosporus and Aspergillus oryzae in solid-state fermentation involves two types of penetrative hyphae: A model-based study on how these hyphae grow
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Publisher
Database: Elsevier - ScienceDirect
Journal: Biochemical Engineering Journal - Volume 114, 15 October 2016, Pages 173–182
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