| Contribution of aerial hyphae of Aspergillus oryzae to respiration in a model solid-state fermentation system. | |
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MedLine Citation:
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PMID: 12115123 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Oxygen transfer is for two reasons a major concern in scale-up and process control in industrial application of aerobic fungal solid-state fermentation (SSF): 1) heat production is proportional to oxygen uptake and it is well known that heat removal is one of the main problems in scaled-up fermenters, and 2) oxygen supply to the mycelium on the surface of or inside the substrate particles may be hampered by diffusion limitation. This article gives the first experimental evidence that aerial hyphae are important for fungal respiration in SSF. In cultures of A. oryzae on a wheat-flour model substrate, aerial hyphae contributed up to 75% of the oxygen uptake rate by the fungus. This is due to the fact that A. oryzae forms very abundant aerial mycelium and diffusion of oxygen in the gas-filled pores of the aerial hyphae layer is rapid. It means that diffusion limitation in the densely packed mycelium layer that is formed closer to the substrate surface and that has liquid-filled pores is much less important for A. oryzae than was previously reported for R. oligosporus and C. minitans. It also means that the overall oxygen uptake rate for A. oryzae is much higher than the oxygen uptake rate that can be predicted in the densely packed mycelium layer for R. oligosporus and C. minitans. This would imply that cooling problems become more pronounced. Therefore, it is very important to clarify the physiological role of aerial hyphae in SSF. |
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Authors:
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Yovita S P Rahardjo; Frans J Weber; E Paul le Comte; Johannes Tramper; Arjen Rinzema |
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Publication Detail:
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Type: Comparative Study; Journal Article; Validation Studies |
Journal Detail:
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Title: Biotechnology and bioengineering Volume: 78 ISSN: 0006-3592 ISO Abbreviation: Biotechnol. Bioeng. Publication Date: 2002 Jun |
Date Detail:
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Created Date: 2002-07-12 Completed Date: 2003-01-07 Revised Date: 2006-11-15 |
Medline Journal Info:
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Nlm Unique ID: 7502021 Medline TA: Biotechnol Bioeng Country: United States |
Other Details:
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Languages: eng Pagination: 539-44 Citation Subset: IM |
Copyright Information:
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Copyright 2002 Wiley Periodicals, Inc. Biotechnol Bioeng 78: 539-544, 2002. |
Affiliation:
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Wageningen Centre for Food Sciences, P.O. Box 557, 6700 AN Wageningen, The Netherlands. Yovita.Rahardjo@algemeen.pk.wau.nl |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Aspergillus oryzae
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metabolism* Biofilms* Computer Simulation Diffusion Fermentation / physiology* Hyphae / metabolism* Models, Biological* Models, Chemical Oxygen / metabolism* Oxygen Consumption Sensitivity and Specificity Triticum |
| Chemical | |
Reg. No./Substance:
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7782-44-7/Oxygen |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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