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Search Results (3)

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Keywords = Candida lambica

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19 pages, 2436 KiB  
Article
Dynamics of Microbiota in Three Backslopped Liquid Sourdoughs That Were Triggered with the Same Starter Strains
by Valentina Tolu, Cristina Fraumene, Angela Carboni, Antonio Loddo, Manuela Sanna, Simonetta Fois, Tonina Roggio and Pasquale Catzeddu
Fermentation 2022, 8(10), 571; https://doi.org/10.3390/fermentation8100571 - 21 Oct 2022
Cited by 4 | Viewed by 3018
Abstract
The preparation of sourdough may include the use of starter microorganisms to address the fermentation process toward specific conditions. The aim of this work was to study the dynamics of the microbial ecosystem in three liquid sourdoughs (SD1, SD2 and SD3) triggered with [...] Read more.
The preparation of sourdough may include the use of starter microorganisms to address the fermentation process toward specific conditions. The aim of this work was to study the dynamics of the microbial ecosystem in three liquid sourdoughs (SD1, SD2 and SD3) triggered with the same microbial strains. Lactiplantibacillus plantarum (formerly known as Lactobacillus plantarum), Saccharomyces cerevisiae and Candida lambica strains were inoculated as starters, and sourdoughs were differentiated for the fermentation conditions and for the method of starter inoculation. The analyses were performed on the three sourdoughs propagated in the laboratory for 22 days and on the sample SD1, which was transferred to a bakery and refreshed over many months. The dynamics of microbial communities were studied by plate-count analysis and metataxonomic approach. The acidity of sourdough was evaluated over time. Metataxonomic analysis highlighted a large heterogeneity of fungi microbiota in all sourdough preparations, many of them probably originated from the flour, being pathogens of plants. Few yeast species were found, and S. cerevisiae was plentiful but did not predominate over the other species, whereas the C. lambica species decreased over time and then disappeared in all preparations. The bacterial microbiota was less heterogeneous than the fungi microbiota; the species L. plantarum, Leuconostoc citreum and Levilactobacillus brevis (formerly known as Lactobacillus brevis) were always present in all sourdoughs, whereas Fructilactobacillus sanfranciscensis (formerly known as Lactobacillus sanfranciscensis) became the dominant species in bakery-propagated SD1 and in SD2 at the end of the propagation period. Full article
(This article belongs to the Special Issue Development and Application of Starter Cultures)
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20 pages, 1202 KiB  
Article
Yeasts in Liquid Swine Diets: Identification Methods, Growth Temperatures and Gas-Formation Potential
by Birgit Keller, Henrike Kuder, Christian Visscher, Ute Siesenop and Josef Kamphues
J. Fungi 2020, 6(4), 337; https://doi.org/10.3390/jof6040337 - 4 Dec 2020
Cited by 4 | Viewed by 2319
Abstract
Liquid feed is susceptible to microbiological growth. Yeasts are said to cause sudden death in swine due to intestinal gas formation. As not all animals given high yeast content feed fall ill, growth and gas formation potential at body temperature were investigated as [...] Read more.
Liquid feed is susceptible to microbiological growth. Yeasts are said to cause sudden death in swine due to intestinal gas formation. As not all animals given high yeast content feed fall ill, growth and gas formation potential at body temperature were investigated as possible causally required properties. The best identification method for these environmental yeasts should be tested beforehand. Yeasts derived from liquid diets without (LD − S) and liquid diets with maize silage (LD + S) were examined biochemically (ID32C-test) and with MALDI-TOF with direct smear (DS) and an extraction method (EX). Growth temperature and gas-forming potential were measured. With MALDI-EX, most yeast isolates were identified: Candida krusei most often in LD − S, and C. lambica most often in LD + S, significantly more than in LD − S. Larger colonies, 58.75% of all yeast isolates, were formed at 25 °C rather than at 37 °C; 17.5% of all isolates did not grow at 37 °C at all. Most C. krusei isolates formed high gas amounts within 24 h, whereas none of the C. lambica, C. holmii and most other isolates did. The gas pressure formed by yeast isolates varied more than tenfold. Only a minority of the yeasts were able to produce gas at temperatures common in the pig gut. Full article
(This article belongs to the Special Issue Fungi and Fungal Metabolites for the Improvement of Human and Animal Nutrition and Health)
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12 pages, 283 KiB  
Article
Rare Invasive Yeast Infections in Greek Neonates and Children, a Retrospective 12-Year Study
by Maria Noni, Angeliki Stathi, Aristea Velegraki, Mika Malamati, Alexandra Kalampaliki, Levantia Zachariadou and Athanasios Michos
J. Fungi 2020, 6(4), 194; https://doi.org/10.3390/jof6040194 - 28 Sep 2020
Cited by 23 | Viewed by 3699
Abstract
Although Candida species remain the leading cause of invasive fungal infections (IFI), the list of other isolated fungal pathogens is increasing. The aim of the study was to report cases of IFI caused by rare yeasts in the largest tertiary Greek pediatric hospital. [...] Read more.
Although Candida species remain the leading cause of invasive fungal infections (IFI), the list of other isolated fungal pathogens is increasing. The aim of the study was to report cases of IFI caused by rare yeasts in the largest tertiary Greek pediatric hospital. A retrospective study was performed from 6/2008–6/2020 regarding IFI caused by rare species. Identification of isolates was attained by conventional, molecular, and MALDI TOF MS methods, and susceptibility testing was performed according to the Clinical and Laboratory Standards (CLSI) methodology. During a 12-year period, 14 different rare fungal species in 33 neonates and children with IFI hospitalized in intensive care and oncology units were isolated from blood, central catheters, peritoneal, pleural, or pericardial fluid specimens. It is the first time for IFI caused by Wickerhamomyces anomalus (Candida pelliculosa), Pichia fermentans (Candida lambica), Yarrowia (Candida) lipolytica, Pichia (Hansenula) kluyveri, Rhodotorula mucilaginosa, Wickerhamiella (Candida) pararugosa and Cyberlindnera (Candida) fabianii in Greek neonates and children to be reported. For most of these rare fungal species isolated in the present study, no official antifungal breakpoints have been defined, and there are no guidelines for their treatment. Clinical laboratories should be aware of uncommon and emerging yeast pathogens and be able to detect them with molecular and proteomic methods. Full article
(This article belongs to the Special Issue Invasive Fungal Infections in Paediatric Haematology: Accomplishments and Challenges)
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