Abstract: The invention concerns a novel isolated microorganism characterized in that it is capable of: i) transforming Kjeldahl nitrogen, ammonia nitrogen and/or nitrogen oxides into gas nitrogen; and ii) transforming carbonaceous matter into carbon dioxide; both transformation processes being carried out in aerobic condition. The invention also concerns a method for treating wastewater using said microorganism.

Abstract: The invention relates to the enrichment of photosynthetic microorganisms in organic selenium using selenohydroxy acid compounds, in particular 2-hydroxy-4-methylselenobutanoic acid, in D or L form, or an enantiomer, salt or ester or amide derivative of these compounds, and also to the use of the microorganisms thus enriched in animal or human nutrition, in cosmetics or in pharmacy.

Abstract: The present invention relates to the use of cell cultures in the open continuous mode, to a method for selecting static cell variants or cell variants which proliferate in suspension, to a culture substrate and to a device suitable for implementing this method.

Abstract: The invention concerns a novel isolated microorganism characterized in that it is capable of: i) transforming Kjeldahl nitrogen, ammonia nitrogen and/or nitrogen oxides into gas nitrogen; and ii) transforming carbonaceous matter into carbon dioxide; both transformation processes being carried out in aerobic condition. The invention also concerns a method for treating wastewater using said microorganism.

Abstract: The invention relates to a method for continuously, semi-continuously or discontinuously treating a substrate (24) consisting in placing said substrate in a bioreactor receiver (1) and in exposing it to the action of a living cell culture (C1) which makes it possible to carry out a reaction (R1) on the substrate (24) and to which a medium is periodically inoculated with the aid of living cells (C2) improving said reaction. Said living cells (C2) are obtainable by selection from a population of dynamic living cells carried out by an automatic selection device (2) which is supplied by the same substrate (24) as the bioreactor receiver (1) and is originally inoculated with the living cells (C1) contained in the bioreactor receiver (1) tank and an operating device.