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

ISBN-10: 0080579752

ISBN-13: 9780080579757

ISBN-10: 0120277158

ISBN-13: 9780120277155

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J. TRlNCl than the rate of expansion of the colony, and hence do not affect the growth rate of the peripheral hyphae. Similarly the rate of diffusion of nutrients from uncolonized parts of the medium towards the margin colony is slow compared with the rate of expansion of most fungal colonies. The leading hyphae of fungal colonies are continually growing into uncolonized medium which has approximately the same composition and pH value as the uninoculated medium. However, in the case of bacterial colonies which expand at very slow rates (Pirt, 19671, there will be a tendency for secondary metabolites formed at the centre of the colony to diffuse through the medium and inhibit growth at the periphery of the colony.

02 h-' was 4, 13 and 26%, respectively. These values are comparable to ones derived for bacteria where, at maximum growth rates, about 10% of the total energy output was used for maintenance purposes (Stebbing, 1973). 75 mmol g biomass-' h-t respectively, for A . , 19711, Trichoderma uiride (M. A. Zainudeen personal communication) and P. chrysogenum (Mason and Righelato, 1976) are consistent with complete oxidation of the glucose used to meet the maintenance requirement. Not surprisingly, maintenance energy requirements increase under conditions of environmental stress such as high salinity (Watson, 1970) and high temperature (MatschCand Andrews, 1973).

Many fungi, such as Aspergillus nidulans and Neurospora crassa, form septa which initially have unoccluded central pores large enough to allow the translocation of vesicles and organelles such as nuclei (Trinci and Collinge, 1973). It is possible that the peripheral growth zone of these hyphae is limited by the plugging of the septal pores (Trinci and Collinge, 1973). The plugging of septal pores may be initiated by the establishment in the medium of conditions which inhibit growth (see Section IV, B; p.

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

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