Influence of culture conditions on the technological properties of Carnobacterium maltaromaticum CNCM I-3298 starters

The aim of this study is to investigate the effect of a broad spectrum of culture conditions on the acidification activity and viability of Carnobacterium maltaromaticum CNCM I‐3298, the main technological properties that determine the shelf‐life of biological time‐temperature integrator (TTI) labels. Cells were cultivated at different temperatures (20–37°C) and pH (6–9·5) according to a modified central composite design and harvested at increasing times up to 10 h of stationary phase. Acidification activity and viability of freeze‐thawed concentrates were assessed in medium mimicking the biological label. Acidification activity was influenced by all three culture conditions, but pH and harvest time were the most influential. Viability was not significantly affected by the tested range of culture conditions.Carnobacterium maltaromaticum CNCM I‐3298 must be cultivated at 20°C, pH 6 and harvested at the beginning of stationary phase to exhibit fastest acidification activities. However, if slower acidification activities are pursued, the recommended culture conditions are 30°C, pH 9·5 and a harvest time between 4–6 h of stationary phase. Quantifying the impact of fermentation temperature, pH and harvest time has led to a predictive model for the production of biological TTI covering a broad range of shelf‐lives

Comparative study of diesel and biodiesel exhausts on lung oxidative stress and genotoxicity in rats

International audienc

The heat and health in cities (H2C) project to support the prevention of extreme heat in cities

International audienceThe main goal of the Heat and Health in Cities (H2C) French project is to improve the urban climate services to support preventive actions and policies to deal with the risk of heat and extreme heat in cities, with the Paris region (France) as a case study. In response, the three scientific objectives are identified: • Improve our understanding of the impacts of urban covers and surface heterogeneities in the city on UHI, local meteorology and air quality. • Strengthen the synergy between numerical modeling and multi-source observations to study the environmental phenomena in detail, and assess the spatial and temporal variations in population exposure to heat and air pollution, and the associated health risks. • Develop and provide information that is useful for decision-making, in terms of UHI assessment, consequences on exposure in both outdoor and indoor environment, associated health impacts, and opportunities for prevention