HORÁK, M., HÍC, P., TOMÁNKOVÁ, E., BALÍK, J.: Procedure to reduce sulphite in wine with anion-exchange resin. Acta univ. agric. et silvic. Mendel. Brun., 2012, LX, No. 8, pp. 79–86 The aim of this experiment was to eliminate SO2 ions present in wine using the anion-exchanger resins. To compare the eff ectiveness, 2 following strongly basic anion-exchange resin were used. When activated, the sod...

The formaldehyde-sulphite clock reaction was studied using an Orion SA 720 pH/ISE meter interfaced to an IBM PC. The laboratory software 'ASYST' was employed to facilitate data acquisition and data treatment. Experimental pH profiles thus obtained for the first time were simulated by invoking a theoretical model based on the reaction mechanism suggested by Burnett [1]. The variation of rate con...

A novel molybdenum-free nitrate reductase was isolated from the obligate chemolithoautotrophic and facultative anaerobic, (halo)alkaliphilic sulphur-oxidizing bacterium Thioalkalivibrio nitratireducens strain ALEN 2. The enzyme was found to contain vanadium and haem c as cofactors. Its native molecular mass was determined as 195 kDa, and the enzyme consists of four identical subunits with appar...

By comparing the batches of UMAGIS medium prepared in our laboratory in the years 1953 to 1954, it was observed that the slow H2S formers such as Salmonella typhosa gave poor H2S formation. Since all the compounds except the sulphur containing ones are stable, an attempt was made to reactivate the medium by the addition of freshly prepared sodium sulphite and sodium thiosulphate. The results we...

Among the anaerobic systems applied for the treatment of paper industry effluents, the IC (Internal Circulation) reactor is gaining a lot of interest. The reactor combines good biomass retention at the outlet with excellent mixing characteristics in the lower part of the reactor. This leads to smaller reactor volumes and less space requirements. Three examples of IC reactors at various recycle ...