The aerobic dechlorination of chlordecone by bacteria from agricultural organochlorine-used soil of Cameroon South-West region is reported. Selection of microorganism strains having great affinity and/or resistant to chlordecone has been carried out. The effects of physicochemical factors (pH, chlordecone amount, incubation time and temperature) on bacteria growth and the biodegradation of chlordecone were investigated. A Bacillus strain has been isolated and was able to resist and grow with chlordecone as sole carbon source. Among physicochemical parameters studied, chlordecone amount had not significant effect on the Bacillus growth in synthetic medium. Free chlorine obtained after incubation of Bacillus sp in the presence of 1 µg/mL of chlordecone as sole carbon source showed a maximum released after 10 days, equivalent to dechlorination of 19.5% of total chlorine in the synthetic medium. This report is the first relative to chlordecone dechlorination under aerobic conditions by Bacillus strain from African ecosystems.

Nowadays, it is known that every action made with the aim of contributing to reverse the global warming is appreciated according to its intrinsic value. Through the effect of economies of scale, together, the little actions made elsewhere are significant. If each person or every family in any area uses solar energy in all its domestic activities, the damage due to energy consumption in the world will be very low. This paper presents the command of an autonomous single phase converter with shifted command used to stabilize the energy produce by the photovoltaic cells in regard of the normal condition of usage. This shifted command aids in modifying the characteristics of the output voltage, particularly the effective value of its fundamental without involving the continue voltage of its energy supply. In multiple applications, it can be used in the energy supply of sensible devices like non synchronous machines. When this is jointed to a pump, it can produce drinking water by a tangential ultrafiltration unit of water with a perforated fiber. When it is combined to the command of the static converter of Mc Murray Bedford which is constituted of a monostich and a dephaser, commanded by the mutual inductance in order to obtain of a tension too close.

The objective of the work consisted in modeling and optimizing the juice extraction physicochemical characteristics from Hibiscus sabdariffa L., in order to be able to put forward its qualities. This was done using response surface methodology (RSM). The models obtained at 60