1,720,980 research outputs found
Biodiversità fenotipica di lieviti isolati da mosti e vini siciliani.
No full textBiodiversità fenotipica di lieviti isolati da mosti e vini siciliani
Il governo dell'acidità titolabile e reale dei vini meridionali con mezzi biologici.
No full textIl governo dell'acidità titolabile e reale dei vini meridionali con mezzi biologici
Valutazione della biodiversità di ceppi di batteri lattici isolati da olive siciliane fermentate al naturale.
No full textValutazione della biodiversità di ceppi di batteri lattici isolati da olive siciliane fermentate al naturale
Identification of Pichia anomala isolated from yoghurt by RFLP of the ITS region
No full textSeveral packs of swollen retailed plain and flavoured yoghurt were examined. The most commonly found species was Pichia anomala, identified both by physiological tests and RFLP analysis of the rDNA internal transcribed spacer (ITS) region. The isolated strains did not ferment lactose and were positive for galactose fermentation, confirming the hypothesis that galactose-fermenting yeast could be the cause of spoilage in yoghurt. (C) 2001 Elsevier Science B.V. All rights reserved
Cryotolerant Saccharomyces strains and spoilage of refrigerated musts
No full textThis study regards yeasts isolated from refrigerated musts with patent ongoing fermentation. The isolates belonged to the genus Saccharomyces sensu stricto with an optimal growth temperature less than 30 degrees C. Karyotype analysis highlighted the constant presence of two well-defined trait bands in the low molecular weight between 225 and 375 kb that distinguished them unequivocally from normal Saccharomyces cerevisiae strains. The isolated strains individually reinoculated in sterile must at 25 degrees C, produce complete fermentation. Analysis of minor fermentation compounds revealed other differences between these strains and Saccharomyces cerevisiae strains. These strains are responsible for the spoilage of fermenting refrigerated must. Phenotype traits, combined with karyotype, suggest that they should not be assigned to Saccharomyces cerevisiae but more reasonably to Saccharomyces bayanus uvarum type
Inheritance of mitochondrial DNA in interspecific Saccharomyces hybrids
No full textSpore conjugation between Saccharomyces cerevisiae and S. uvarum strains yields hybrids which have mitochondria of only a parental type: either of S. cerevisiae or S. uvarum. The peculiarity of examined hybrids is due to the homogeneity of their clone populations that are consisting of cells, all characterised by the same mitochondrial type. It seems to be probable to suppose an incompatibility of parental mitochondrial DNA (mtDNA).Spore conjugation between Saccharomyces cerevisiae and S. uvarum strains yields hybrids which have mitochondria of only a parental type: either of 5. cerevisiae or S. uvarum. The peculiarity of examined hybrids is due to the homogeneity of their clone populations that are consisting of cells, all characterised by the same mitochondrial type. It seems to be probable to suppose an incompatibility of parental mitochondrial DNA (mtDNA)
Screening for yeasts able to hydrolyse arbutin in the presence of glucose or ethanol
No full textThe study was carried out using 212 glucose-fermenting yeasts isolated from Calabrian and Sicilian samples of must and wine. They were screened for beta-glucosidase activity in Petri plates containing arbutin agar medium. Eleven strains (three apiculate yeasts and eight elliptic yeasts) were able to perform arbutin hydrolysis, but only strain C5, identified as Pichia anomala, maintained the ability to hydrolyse arbutin even in the presence of remarkable amounts of glucose or ethanol. This strain did not show the capacity to excrete the beta-glucosidase into the medium; effectively, the enzymatic activity in the culture supernatant was near to zero. However, its intracellular activity was high
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
A b-glucosidase positive strain of Saccharomyces cerevisiae isolated from grape must
No full textA b-glucosidase positive strain of Saccharomyces cerevisiae isolated from grape mus
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