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Additional info for Advances in Microbial Physiology, Vol. 15
Yeast suspensions. Oscillations in NADH, concentration were thought to be induced by the allosteric activation of phosphofruktokinase. Such a control mechanism produced a predictable short-cycle oscillation and, due to the point stimulation (hexose addition), the oscillations eventually damped out. More recently Poole et al. (1973) have attempted to resolve oscillatory respiratory activity in synchronously dividing populations of Schizosaccharomyces pombe. Respiration was considered to comprise two components, only one of which oscillated and, although the control mechanism has not been identified, i t possibly relates to a Pasteur effect.
The hyphae measured had 3-8 tips. The medium was supplemented with thiamine and biotin for the phycomycetes. Values are quoted k standard errors ot'the mean. ( I . J. Caldwell and A. P. J. Trinci, unpublished results) Hyphal growth unit (G,pm) Species Cunninghamella sp Rhizopus slolonifer M ucor rammanianus MUCOThiemalis Aclinomucor repens" Aspergillus niger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?
BULL AND A. P. J. TRlNCl response to the changes induced in the medium by growth of the mould. “Mature” colonies can be divided into at least four morphological zones (Yanagita and Kogane, 1962): (1)the extending zone (which is equal to the peripheral growth zone; Trinci, 197 1 ), made up of the peripheral, sparse network of vegetative hyphae not supporting aerial hyphae; (2) the productive zone, made up of a much denser network of vegetative hyphae supporting aerial hyphae; (3) the fruiting zone, where asexual and/or sexual reproductive structures are formed; and (4)and aged zone, made up of the “aged” and autolysing hyphae at the centre of the colony.