Accumulation of intracellular S-adenosylmethionine increases the fermentation rate of bottom-fermenting brewer's yeast during high-gravity brewing.

High-gravity brewing has been used to reduce costs and energy, as well as to produce new types of beer with high alcohol content. To identify the key metabolic pathways underlying efficient high-gravity brewing, we explored metabolites that were highly accumulated during alcoholic fermentation under high-maltose conditions using bottom-fermenting brewer's yeast, Saccharomyces pastorianus. Based on metabolomic data, we focused on S-adenosylmethionine (SAM), which may be involved in glycolysis and alcoholic fermentation in the closely related yeast species Saccharomyces cerevisiae.

Lactobacillus curtus sp. nov., isolated from beer in Finland.

A Gram-stain-positive, catalase-negative and short-rod-shaped organism, designated VTT E-94560, was isolated from beer in Finland and deposited in the VTT culture collection as a strain of Lactobacillus rossiae. However, the results of 16S rRNA gene sequence analysis showed that VTT E-94560 was only related to Lactobacillus rossiae JCM 16176 with 97.0 % sequence similarity, lower than the 98.

Defective quiescence entry promotes the fermentation performance of bottom-fermenting brewer's yeast.

One of the key processes in making beer is fermentation. In the fermentation process, brewer's yeast plays an essential role in both the production of ethanol and the flavor profile of beer. Therefore, the mechanism of ethanol fermentation by of brewer's yeast is attracting much attention.

Rapid detection and identification of beer-spoilage lactic acid bacteria by microcolony method.

We evaluated a microcolony method for the detection and identification of beer-spoilage lactic acid bacteria (LAB). In this approach, bacterial cells were trapped on a polycarbonate membrane filter and cultured on ABD medium, a medium that allows highly specific detection of beer-spoilage LAB strains. After short-time incubation, viable cells forming microcolonies were stained with carboxyfluorescein diacetate (CFDA) and counted with muFinder Inspection System.

Rapid and sensitive detection of viable bacteria in contaminated platelet concentrates using a newly developed bioimaging system.

Background: Rapid and sensitive methods for the detection of bacteria in platelet concentrates (PCs) are required as well as inactivation techniques to decrease the transfusion-associated risk of infection from bacterially contaminated PCs. In this study, a rapid microbiologic method for the sensitive counting of viable bacteria in PCs was developed by combining a fluorescent staining technique and a bioimaging system.

Study Design And Methods: An esterase indicator, carboxyfluorescein diacetate, was used to detect physiologically active bacteria.

Effects of morphological changes in beer-spoilage lactic acid bacteria on membrane filtration in breweries.

Membrane filter performance was investigated using beer-spoilage lactic acid bacteria (LAB). As a result, beer-adapted LAB strains showed considerably increased penetration rate through filters, as compared with non-adapted strains. Further statistical analyses demonstrated the significant shifts in cell size distribution towards shorter rods, when Lactobacillus brevis and L.