Abstract: Method for biomass determination in a medium, in particular a medium containing biological cells suspended in a conductive fluid, the biomass concentration (X) being obtained from a difference between a first capacitance signal (C?1) of the medium, measured at a first frequency, and a second capacitance signal (C?2) of the medium, measured at a second frequency. The method includes a separate correction of each of the measured signals, based at least on one correction level, the first correction level including a correction of the signals measured in accordance with a model dependent on the conductance of the medium at the first and second frequencies. The invention is useful in biomass measurement systems.

Abstract: Method for biomass determination in a medium, in particular a medium containing biological cells suspended in a conductive fluid, the biomass concentration (X) being obtained from a difference between a first capacitance signal (C?1) of the medium, measured at a first frequency, and a second capacitance signal (C?2) of the medium, measured at a second frequency. The method includes a separate correction of each of the measured signals, based at least on one correction level, the first correction level including a correction of the signals measured in accordance with a model dependent on the conductance of the medium at the first and second frequencies. The invention is useful in biomass measurement systems.

Abstract: Process for continuous production of vinegar by microbiological conversion with oxygen enrichment of ethanol into acetic acid. In a first phase, the micro-biological conversion of ethanol into acetic acid is performed in the presence of air. After consumption of the oxygen in the air, in a second phase, the addition of oxygen, controlled by the demand of the system, is provided by injection of pure oxygen, the aeration gas being recycled, and the gas mixture expelled as soon as the carbon dioxide content reaches the threshold of 7%. After closing of the recycling circuit, the superoxygenated atmosphere is reconstituted with pure oxygen.