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Leuconostoc mesenteroides

ABSTRACT: Lactic acid bacterium used in food production

PROVIDER: PRJNA35195 | ENA |

REPOSITORIES: ENA

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			Action	DRS
		Other
	SRR089520.fastq.gz	Fastqsanger.gz
	SRR089520_1.fastq.gz	Fastqsanger.gz
	SRR089520_2.fastq.gz	Fastqsanger.gz
	SRR12976642.fastq.gz	Fastqsanger.gz

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Responses of Staphylococcus aureus exposed to HCl and organic acid stress.

Project description:Staphylococcus aureus is an important food poisoning bacterium. In food preservation, acidification is a well-known method. Permeant weak organic acids, like lactic and acetic acids, are known to be more effective against bacteria than inorganic strong acids (e.g., HCl). Growth experiments and metabolic and transcriptional analyses were used to determine the responses of a food pathogenic S. aureus strain exposed to lactic acid, acetic acid, and HCl at pH 4.5. Lactic and acetic acid stress induced a slower transcriptional response and large variations in growth patterns compared with the responses induced by HCl. In cultures acidified with lactic acid, the pH of the medium gradually increased to 7.5 during growth, while no such increase was observed for bacteria exposed to acetic acid or HCl. Staphylococcus aureus increased the pH in the medium mainly through accumulation of ammonium and the removal of acid groups, resulting in increased production of diacetyl (2,3-butanedione) and pyrazines. The results showed flexible and versatile responses of S. aureus to different types of acid stress. As measured by growth inhibition, permeant organic acid stress introduced severe stress compared with the stress caused by HCl. Cells exposed to lactic acid showed specific mechanisms of action in addition to sharing many of the mechanisms induced by HCl stress. Data is also available from http://bugs.sgul.ac.uk/E-BUGS-87

2011-04-15 | E-BUGS-87 | biostudies-arrayexpress

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Project description:From July 2003 through October 2004, 42 patients became infected by strains of Leuconostoc mesenteroides subsp. mesenteroides (genotype 1) in different departments of Juan Canalejo Hospital in northwest Spain. During 2006, 6 inpatients, also in different departments of the hospital, became infected (genotypes 2–4). Parenteral nutrition was the likely source.

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Global Transcriptomics Reveals Carbon Footprint of Food Waste in the Bioconversion of Ecofriendly Polymers

Project description:Food waste is a major source of environmental pollution, as its landfills attribute to greenhouse gas emissions. This study developed a robust upcycling bioprocess that converts food waste into lactic acid through autochthonous fermentation and further produces biodegradable polymer polyhydroxybutyrate (PHB). Food can be stored without affecting its bioconversion to lactic acid, making it feasible for industrial application. Mapping autochthonous microbiota in the food waste fermentation before and after storage revealed lactic-acid-producing microorganisms dominate during the indigenous fermentation. Furthermore, through global transcriptomic and gene set enrichment analyses, it was discovered that coupling lactic acid as carbon source with ammonium sulfate as nitrogen source in Cupriavidus necator culture upregulates pathways, including PHB biosynthesis, CO2 fixation, carbon metabolism, pyruvate metabolism, and energy metabolism compared to pairing with ammonium nitrate. There was ∼90 % PHB content in the biomass. Overall, the study provides crucial insights into establishing a bioprocess for food waste repurposing.

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