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Download PDF by A. H. , Tempest, D. W. , editors Rose: Advances in Microbial Physiology, Vol. 15

By A. H. , Tempest, D. W. , editors Rose

ISBN-10: 0080579752

ISBN-13: 9780080579757

ISBN-10: 0120277158

ISBN-13: 9780120277155

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C O M P A R I S O N O F T H E C O L O N I Z A T I O N OF S O L I D SUBSTRATES BY M O U L D S A N D UNICELLULAR M I C R O - O R G A N I S M S The filamentous morphology of moulds enables them to colonize solid substrates more efficiently than non-motile, unicellular microorganisms. g. Thus fungal colonies are able to expand across solid substrate at much faster rates than bacterial colonies although fungi usually have the slower specific growth rates. The wide peripheral growth zones of fungal colonies result in their having radial growth rates which usually exceed the rates of diffusion of chemicals in the medium.

Clearly, each of these effects may vitiate the maintenance of steady-state conditions. The prevention of accreted growth essentially is a biochemical engineering problem, and several fermenter designs and operating conditions have been proposed to alleviate the problem, especially in continuous flow systems. For THE PHYSIOLOGY AND METABOLIC CONTROL OF FUNGAL GROWTH 39 further information, the interested reader is directed to the papers of Righelato and Pirt (1967), Brunner and Rohr (19721, Bull and Bushel1 (19761, Means et al.

The growth rate of such hyphae will then be limited by the rate of diffusion of oxygen from the air above the colony. g. citric acid). 3 . g. g. citric acid). The pH value of the medium is particularly likely to change when it has little buffering capacity. THE PHYSIOLOGY AND METABOLIC CONTROL OF FUNGAL GROWTH 29 Changes in the pH value of the medium are likely to affect the mould’s growth rate and may also encourage production of certain secondary metabolites. 4. Accumulation of Secondary Metabolites Accumulation of products of secondary metabolism in the medium is likely to lower further the organism’s growth rate, and thus trigger a positive feedback mechanism.

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Advances in Microbial Physiology, Vol. 15 by A. H. , Tempest, D. W. , editors Rose


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