Search results for "COF"

NAD(P)H regeneration is the key for heterolactic fermentation of hexoses in Oenococcus oeni

2002

Oenococcus oeni (formerly Leuconostoc oenos) can perform malolactic fermentation, converting L-malate to L-lactate and carbon dioxide, in wines. The energy and redox potential required to support the growth of the micro-organism are supplied mainly by the consumption of carbohydrates via the heterolactic pathway. In the first steps of hexose metabolism two molecules of NAD(P)(+) are consumed, which must be regenerated in later reactions. The aim of this work was to test if aerobic growth of O. oeni promotes higher cell yields than anaerobic conditions, as has been shown for other lactic acid bacteria. O. oeni M42 was found to grow poorly under aerobic conditions with glucose as the only car…

Are soils suppressive to fungal diseases the sources of biocontrol agents ?

2014

Soils suppressive to soil-borne diseases are defined by a low disease incidence in spite of the presence of a virulent pathogen and a susceptible plant. In many cases, the inhibition of the disease development relies on the activity of the resident soil microbiome. Suppressiveness can be transmitted to conducive soil by mixing a small amount of suppressive soil into the conducive one. To identify microbial taxons linked to the suppressive phenotype of soils, culture independent-based methods have been employed to analyze and compare microbial diversities in two different soils suppressive (respectively conducive) to either Fusarium wilt of flax or Rhizoctonia diseases of sugar beet. Metagen…

Aroma release from coffee beverages is affected by matrix composition and human saliva during in vitro analysis in model mouth device coupled with PT…

2016

International audience

The noncovalent dimerization of a G-quadruplex/hemin DNAzyme improves its biocatalytic properties.

2020

While many protein enzymes exert their functions through multimerization, which improves both selectivity and activity, this has not yet been demonstrated for other naturally occurring catalysts. Here, we report a multimerization effect applied to catalytic DNAs (or DNAzymes) and demonstrate that the enzymatic efficiency of G-quadruplexes (GQs) in interaction with the hemin cofactor is remarkably enhanced by homodimerization. The resulting non-covalent dimeric GQ–DNAzyme system provides hemin with a structurally defined active site in which both the cofactor (hemin) and the oxidant (H2O2) are activated. This new biocatalytic system efficiently performs peroxidase- and peroxygenase-type biot…

Monitoring microbial diversity in European soils: ongoing projects and challenges

2012

SPEEcolDurGenoSolCT3communication orale invitée, résumé et slides; According to the Convention of Biological Diversity (Rio de Janeiro, 1992), biodiversity is the variation in life from genes to species, communities, ecosystems, and landscapes. Soils represent a huge reservoir of biodiversity which varies in terms of taxonomic richness, relative abundance and distribution according to soil types, climatic conditions, vegetation and land uses. The key functions supporting ecosystem services as identified in the Millennium Ecosystem Assessment (MEA, 2005) largely depend upon organisms that inhabit the soil. Thus, the design and implementation of a sustainable soil management strategy requires…

EcoFINDERS Characterize biodiversity and the function of soils in Europe 23 partners in 10 European countries and China

2011

National audience

Ecological Function and Biodiversity Indicators in European Soils EcoFINDERS

2012

EcoFINDERS, Ecological Function and Biodiversity Indicators in European Soils

2012

Oral processing and matrix composition affect aroma release and particle size distribution after consumption of coffee-creamer emulsions.

2016

International audience; Context and objectives: In humans, the main events that contribute to in-mouth emulsion breakdown are shear forces due to tongue movements and action of saliva. To date, most of the studies on the field were conducted on model emulsions and little is known about creamer emulsion and in particular hot coffee/creamer emulsions. In this context, the objective of the present work is to better understand how human oral physiology may govern the in-mouth breakdown of coffee-creamer beverages with consequence of food bolus structure and aroma release and to focus on saliva role and composition in particular. Methodology: The work was conducted on 7 coffee-creamer matrices d…

La nécropole monumentale d'Escolives-Sainte-Camille "La Pièce de l'Étang" (Yonne). Premiers résultats (fouilles 1997-1999)

2004

International audience; La fouille de ce site a été entreprise en collaboration avec l'Université d'Edimbourg (Pr. M. Midgley) dans le cadre d'un projet de recherche sur les origines et les mutations marquant l'éclosion du Néolithique moyen en Sud-Est du Bassin parisien : mieux caractériser les pratiques funéraires et leur évolution, progresser dans la compréhension de la structure sociale, mieux appréhender le modèle d'organisation territoriale.Le site de "La Pièce de l'Étang" à Escolives-Sainte-Camille (Yonne) a volontairement été choisi en amont de l'Yonne moyenne, dans une zone où l'occupation connue relève plutôt d'un Chasséen du Sud et non du Cerny. Repéré par des survols aériens de J…