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Showing papers on "Arabitol published in 1987"


Journal ArticleDOI
TL;DR: It could subsequently be shown that this is caused by the intermediate accumulation and partial re-consumption of a number of polyhydric alcohols (glycerol, arabitol, erythritol and mannitol) during citric acid fermentation.
Abstract: Quantitative balances have been made for sugar and oxygen uptake rates during citric acid accumulation by Aspergillus niger: during the first phase of citric acid accumulation (up to 130 h) more sugar is taken up than the production of biomass, CO2 and citric acid account for. In contrast, during later phases of fermentation more citric acid, CO2 and biomass are formed than sugar uptake would theoretically allow. A similar pattern is obtained for oxygen uptake, where less uptake occurs during the early phase of fermentation than needed for complete balance, and the reverse is observed during the late stage of fermentation. It could subsequently be shown that this is caused by the intermediate accumulation and partial re-consumption of a number of polyhydric alcohols (glycerol, arabitol, erythritol and mannitol) during citric acid fermentation.

44 citations


Journal ArticleDOI
TL;DR: Sclerotia produced at different water potentials showed differences in subsequent germination behaviour on water agar, and those formed at low potentials germinated more vigorously and exuded greater amounts of water, mannitol, glycerol and glucose than those from higher potentials.
Abstract: On KCl- and NaCl-adjusted media, linear extension rates of Sclerotinia sclerotiorum mycelia measured over 2–3 days decreased with decreasing water potential, with zero growth at −6.0 MPa. Increasing the incubation period to 4–5 days at −2.0 to −6.0 MPa resulted in an increase in extension rates over those at 2–3 days. On the same media, sclerotium numbers fell with decreasing water potential as did the amount of fluid exuded by each sclerotium. However, the average weights of individual sclerotia increased. Sclerotia contained (in order of amounts present) mannitol, glycerol, glucose, arabitol and trehalose. Exudates similarly contained mannitol, glycerol, arabitol and glucose. Totalled concentrations of these solutes in both sclerotia and exudates increased linearly with decreasing substratum water potential. Sclerotia produced at different water potentials showed differences in subsequent germination behaviour on water agar. Those formed at low potentials germinated more vigorously and exuded greater amounts of water, mannitol, glycerol and glucose than those from higher potentials. In addition, during germination they lost more dry weight and tended to produce secondary sclerotia. These observations are discussed in relation to osmoregulation during sclerotium morphogenesis and germination.

23 citations