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Extra resources for Advances in Microbial Physiology, Vol. 15
The exponential and deceleration phases are usually of comparatively short duration, and in Aspergillus nidulans are completed by the time the colony has grown one mm from the edge of the inoculum (Trinci, 1969). Thus for most of its growth a fungal colony expands at a linear rate. The rate of the linear phase is not influenced by the ploidy of the nuclei (Lhoas, 1968). 1. Influence of Peripheral Growth Zone Width on Radial Expansion Pirt (1967) suggested that growth of a microbial colony was restricted to a peripheral annulus and that growth in the centre of the colony eventually stopped due to exhaustion, or near exhaustion, of a particular nutrient.
Trinci, unpublished results) Hyphal growth unit (G,pm) Species Cunninghamella sp Rhizopus slolonifer M ucor rammanianus MUCOThiemalis Aclinomucor repens" Aspergillus niger Aspergdlus wenlii Aspergillus gtganteus Penicillium clavtforme Penicillium chyogenum Geolrichum candiduma Cladosporium sp Verlicillium sp Fusarium vaucerium Fusarium avenaceum Trichoderma viride 35 f 9 124 f 31 31 f 10 95 f 22 352 k 97 I? f 14 6 6 k 15 7lf9 104 f 18 48 f 10 110 f 28 59f 1 1 8 2 2 17 682 f 26 620 f 164 160 f 31 "Grown at 3oOC.
J. TRlNCl for the particular nutrient which may eventually limit growth. Moulds, like bacteria, generally have a high affinity for essential nutrients h e . a low K,value); thus, the concentration of the limiting nutrient has to be decreased to a very low level before it causes a lowering in growth rate. 0 mg l-l, respectively (Fiddy and Trinci, 1975). In the case of these fungi, the concentration of glucose in the medium would have to fall below about 45 nig 1-I before growth rate became glucose-limited.