Genetic analysis of organoleptic quality in fresh market tomato. 2. Mapping QTLs for sensory attributes

International audienc

Progress in Microbial Fuel Cells Energy Production

International audienceBiological fuel cells are devices capable of directly transforming chemical to electrical energy via electrochemical reactions involving biochemical pathways. Among others, microbial fuel cells (MFCs) use bacterial metabolism at the anode to produce electricity from a wide range of organic substrate. While the idea of harvesting energy produced by MFCs is sprouting, two major issues need to be addressed: low power densities and high manufacturing cost. A typical 1 liter reactor produces no more than 10mW of electrical power, while the costs of the materials to manufacture it is above 30€. High price is caused by the use of nafion and platinum respectively in the membrane and the cathode. A lowcost (and low power density) MFC was built. Earthen membrane replaced nafion and biocathode replaced platinum cathode. Other more common works investigate single chamber air-cathode reactors where the membrane and the cathode are combined. Recent multidisciplinary works on reactor designs, electrodes, substrate and bacterial communities address price and performance issues altogether. In the near future, electrical engineers will contribute by designing adapted power management modules to capture and make use of the harvested energy. The way is long before MFCs can reach the present competitiveness of other renewable energy sources like photovoltaic modules. First applications of MFCs will most likely be to power micro-sensors in remote areas

Analysis of Tomato Fruit: Effect of Frozen Storage on Compositional Values- an Inter-laboratory Study

Tomato culturing trials often result in too many samples to analyse while fresh. The most common technique is to seal them in containers and preserve them by deepfreezing for subsequent analysis. An inter-laboratory study has been made of the effect of freezing for various lengths of time on a number of compositional factors. Tests for soluble solids, dry matter content, electrical conductivity, titratable acidity, potassium, pH, glucose, fructose, sucrose, total N and Vitamin C in frozen tomatoes indicated that the levels of most of these constituents remained relatively constant during frozen storage and were similar to values found in the fruit prior to freezing. When the tomatoes were frozen as a purée it was essential to thaw them in the stabilising/ extracting solution used in the Vitamin C analytical procedure, otherwise there was a large loss in ascorbic acid.EECDeposited by bulk impor

Récupération de l'énergie électrique produite par les piles à combustibles microbiennes

Les Piles à Combustibles Microbiennes (PCMs) produisent de l'électricité à partir de la dégradation de matière organique par des bactéries. Pour récupérer l'énergie électrique produite, des architectures mettant en jeux plusieurs piles seront préférées à des architectures basées sur une pile unique de taille importante. Par ailleurs la nécessité d'élever les tensions, de mutualiser les puissances et d'adapter la charge à la source passent par le choix et le dimensionnement d'une chaîne judicieuse de convertisseurs de puissance spécifiques (faible tension d'entrée et basse puissance) au sein d'un réseau de PCMs. Le nombre de micro-sources considérées conduit naturellement à envisager la cellularisation de la conversion avec mise en réseau série et/ou parallèle des convertisseurs. Une récupération efficace de l'énergie passe également par l'intégration de la fonctionnalité MPPT (Maximum Power Point Tracking) qui permet d'adapter la charge à la pile

Caractéristiques agronomiques et physico-chimiques de lignées de tomate isogéniques, sauf pour le gène pat-2 de parthénocarpie, dans trois types variétaux, en culture de printemps, sous serre plastique très peu chauffée

International audienc

Genetic analysis of organoleptic quality in fresh market tomato. 1. Mapping QTLs for physical and chemical traits

International audienc

Contrôle génétique de la variation des teneurs en composés volatils chez la tomate

National audienc

Microbial Fuel Cells: From biomass (waste) to electricity

International audienceThe microbial fuel cell (MFC) technology could provide opportunities for electricity generation from the organic matter. Indeed a MFC can produce electric energy by converting a part of the chemical energy contained in biodegradable substrates through the metabolic activity of bacteria. This could be both economically and environmentally effective when the organic matter does not have any intrinsic value as in the case of domestic or industrial waste waters. This paper presents the principle and current development in the domain of MFC and gives an idea of potential future applications

Cartographie moléculaire de la qualité organoleptique de la tomate. Perspectives d'utilisation des QTL

National audienc