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Biosci Biotechnol Biochem 2021 Feb 12. Epub 2021 Feb 12.

Division of Biological Science, Graduate School of Science and Technology, Nara Institute of Science and Technology, Nara, Japan.

In response to environmental stress, microorganisms adapt to drastic changes while exerting cellular functions by controlling gene expression, metabolic pathways, enzyme activities, and protein-protein interactions. Microbial cells that undergo a fermentation process are subjected to stresses, such as high temperature, freezing, drying, changes in pH and osmotic pressure, and organic solvents. Combinations of these stresses that continue over long terms often inhibit cells' growth and lead to their death, markedly limiting the useful functions of microorganisms (eg their fermentation ability). Read More

Appl Microbiol Biotechnol 2021 Apr 9. Epub 2021 Apr 9.

Department of Viticulture and Oenology, South African Grape and Wine Research Institute, Stellenbosch University, Private Bag X1, Stellenbosch, 7600, South Africa.

The general interest in microbial ecology has skyrocketed over the past decade, driven by technical advances and by the rapidly increasing appreciation of the fundamental services that these ecosystems provide. In biotechnology, ecosystems have many more functionalities than single species, and, if properly understood and harnessed, will be able to deliver better outcomes for almost all imaginable applications. However, the complexity of microbial ecosystems and of the interactions between species has limited their applicability. Read More

Lett Appl Microbiol 2021 Apr 5. Epub 2021 Apr 5.

College of Food Science and Nutritional Engineering, China Agricultural University, Beijing, China.

The microbial degradation of thin stillage for environment-friendly treatment has been studied extensively in recent years, and useful compounds in the treated-thin stillage are expected to be utilized in the subsequent fermentation. In this study, an Aspergillus oryzae H18, suitable for growing in thin stillage, was isolated from soil and served to degrade the organic matter in thin stillage, with the increase in pH (from 3·75 to 4·8) and decrease in chemical oxygen demand (COD, 81·3% removal rate). The effect of thin stillage as backset water after degradation of the strain H18 on alcohol production in syrup liquid was investigated. Read More

ACS Omega 2021 Mar 18;6(12):8038-8044. Epub 2021 Mar 18.

Engineering Research Center of Sustainable Development and Utilization of Biomass Energy, Ministry of Education and School of Life Science, Yunnan Normal University, Kunming 650500, P. R. China.

A two-stage process was used to prepare rice alcohol, i.e., saccharification of glutinous rice by Q3, followed by fermentation. Read More

Int J Food Microbiol 2021 Mar 17;347:109169. Epub 2021 Mar 17.

Biotecnología Industrial, Centro de Investigación y Asistencia en Tecnología y Diseño del Estado de Jalisco A.C., Camino Arenero 1227, Col. El Bajío del Arenal, C.P. 45019 Zapopan, Jalisco, Mexico. Electronic address:

The isolation of autochthonous yeast species presents a good strategy to select new microorganisms for developing an adequate inoculum to carry out fermentations and generate representative products of the cider production zone. However, non-Saccharomyces yeasts have been considered to have low capacity to carry out a complete fermentation as Saccharomyces cerevisiae. In this work, five autochthonous yeasts from a cider fermentation process were isolated and identified as Saccharomyces cerevisiae, Kluyveromyces marxianus, Pichia membranaefaciens, P. Read More