Candida Research Today is a free monthly online journal that collates and summarizes the latest research about Candida, including details on thrush infections, yeast, diet, treatment, symptoms.

Impact of ecological factors on the stability of microbial associations in sourdough fermentation.

Vogelmann SA, Hertel C

Institute of Food Science and Biotechnology, University of Hohenheim, Stuttgart, Germany.

The limits for the stability of the microbial association 1 (Lactobacillus sanfranciscensis and Candida humilis) and association 2 (Lactobacillus reuteri, Lactobacillus johnsonii and Issatchenkia orientalis) during sourdough fermentation were evaluated by investigating the effects of the ecological factors substrate, refreshment time, temperature, amount of backslopping and competing species in different combinations on their growth. Sourdoughs were fermented in 28 batches under different conditions using the associations and possible competing strains as starters. The dominating microbiota was characterized by bacteriological culture, rRNA gene sequence analysis and RAPD-PCR. Association 1 was found to be competitive in doughs with rye and wheat flour at temperatures between 20 and 30 °C, refreshment times of 12 and 24 h, amounts of backslopping dough from 5 to 20% and against all competing lactic acid bacteria and yeasts. The processing parameters for the competitiveness of the association 2 were temperatures of 35-40 °C, refreshment times of 12-24 h and the substrates rye bran, wheat and rye flour, but not in every case. Issatchenkia orientalis could only grow when enough oxygen was available. Its cell counts fell rapidly under the limit of detection when using high amounts of doughs (small ratio of surface to volume) and refreshment times of 12 h. In conclusion, the results demonstrated that the two associations were remarkably stable under most of the investigated process conditions.

Published 1 March 2011 in Food Microbiol, 28(3): 583-9.
Full-text of this article is available online (may require subscription).

Articles on Candida published 21 February 2011:

Comparative analysis of the frequency, distribution and population sizes of yeasts associated with canine seborrheic dermatitis and healthy skin.   Vet Microbiol, 148(2): 356-62.

The purpose of this study was to investigate the diversity of yeast associated with the degree of canine seborrheic dermatitis (SD) by anatomical sites. Fifty-seven samples were divided as 17 healthy skin, 20 with primary seborrheic dermatitis (PSD), and 20 with secondary seborrheic dermatitis (SSD). Yeast isolation and characterization were carried out based on microscopical features and biochemical properties. DNA analysis at the internal transcribed spacer I of 26S rDNA region was utilized ... [Abstract] [Full-text]

Articles on Candida published 14 February 2011:

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Articles on Candida published 25 January 2011:

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Articles on Candida published 24 January 2011:

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[Abstract] [Full-text]

Articles on Candida published 14 January 2011:

Genetic control of Candida albicans biofilm development.   Nat Rev Microbiol, 9(2): 109-18.

Candida species cause frequent infections owing to their ability to form biofilms - surface-associated microbial communities - primarily on implanted medical devices. Increasingly, mechanistic studies have identified the gene products that participate directly in the development of Candida albicans biofilms, as well as the regulatory circuitry and networks that control their expression and activity. These studies have uncovered new mechanisms and signals that govern C. albicans biofilm ... [Abstract] [Full-text]

Genetic control of Candida albicans biofilm development.   Nat Rev Microbiol, 9(2): 109-18.

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Genetic control of Candida albicans biofilm development.   Nat Rev Microbiol, 9(2): 109-18.

Candida species cause frequent infections owing to their ability to form biofilms - surface-associated microbial communities - primarily on implanted medical devices. Increasingly, mechanistic studies have identified the gene products that participate directly in the development of Candida albicans biofilms, as well as the regulatory circuitry and networks that control their expression and activity. These studies have uncovered new mechanisms and signals that govern C. albicans biofilm ... [Abstract] [Full-text]

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