Kvasny Prumysl, 1980 (vol. 26), issue 12
Identification of bacteria rapidly spoiling beer.Peer-reviewed article
J. ŠAVEL, M. PROKOPOVÁ
Kvasny Prum. 1980; 26(12): 265-267 | DOI: 10.18832/kp1980043 
The article deals with a method permitting to identify selectively bacteria spoiling bottled beer. Semi-solid medium consists of beer, agar (0,2 %) and actidione. For analyses the medium is passed through samples on Petri dishes, membrane filters etc. Samples can be also inoculated into a partly solidified medium with a loop. Carbon dioxide can be used as an efficient inhibitor suppressing bacteria which may interfere with the identification. Medium must be saturated with CO2 under pressure ranging from 0,12 to 0,14 MPa. As rapidly spoiling bacteria are classified strains capable at temperature28 °C form colonies within 7 days. The authors...
Cultivation of Candida utilis yeast in ethanol substrate. Part VII. Balance of some biogenic and trace elements in plant conditions.Peer-reviewed article
J. RYBÁŘOVÁ, F. ŠTROS, K. PECKA
Kvasny Prum. 1980; 26(12): 268-273 | DOI: 10.18832/kp1980044
The authors have studied changes in the concentrations of some important biogenic and trace elements in synthetic ethanol substrate used for continuous cultivation of Candida utilis yeast in plants with a complete recirculation of separated medium. Three biogenic elements, viz. Mg, Na and Ca, as well as four trace ones, viz. Zn, Fe, Cu and Mn are covered in the study. It has been established, that Mg, Ca, Na and Zn are present in culture medium during the whole cultivation cycle in quantities quite sufficient for the propagation of cells. As to Fe, Cu and Mn, their concentrations both in yeast and medium are gradually decreasing. It can be therefore...
Economical aspects of various methods applied to prepare synthetic ethyl alcohol for fermentation processes.Peer-reviewed article
J. ROSÁK, V. KRUMPHANZL, J. PELECHOVÁ
Kvasny Prum. 1980; 26(12): 274-275 | DOI: 10.18832/kp1980045
Synthetic ethanol used for fermentation processes must be refined. Refining is necessarily connected with costs depending on the refining technology. The article deals with five refining methods taking as a principal criterion purity of the final product. Extractive distillation can be recommended as an economical process giving very satisfactory results.(In Czech, English summary only)
Performance characteristics of a multistage tower fermentor under conditions of higher viscosities of liquid phase.Peer-reviewed article
J. PÁCA
Kvasny Prum. 1980; 26(12): 276-280 | DOI: 10.18832/kp1980046
The effects of viscosity and impeller speed on the degree of homogeneity, backflow coefficient and oxygen transfer rate in individual stages of a multistage, tower fermentor with mechanical mixing, were studied. The viscosity was simulated by aqueous solutions of glycerol. The results showed that an increase of viscosity of the liquid phase decreased the magnitude of both backflow coefficient and oxygen transfer rate. However, when a definite limit of viscosity is exceeded, value of oxygen transfer rate is no more dependent on the viscosity. At higher viscosities there appeared a significant effect of dilution rate on the degree of homogeneity in the...
Interaction between enviromental conditions and biosynthesis of excessive metabolites.Peer-reviewed article
P. ETTLER
Kvasny Prum. 1980; 26(12): 280-282 | DOI: 10.18832/kp1980047
The type and design of fermentation vessel influences the biosynthetic process. The results from shaken flasks and laboratory scale can't offer enough data for dimensional analysis. The discussion is focused on some physical factors limiting the microbial growth under specific environment e. g. resistences to oxygen transfer.(In Czech, English summary only)
Must yields from several wine grape varieties grown in Moravia.Peer-reviewed article
J. BLAHA
Kvasny Prum. 1980; 26(12): 282-284 | DOI: 10.18832/kp1980048
The must yield from wine grapes is one of the factors determining economical results of viniculture. The yields depend on natural conditions which cannot be changed or controlled, on specific properties of various grape varieties, technology used in pressing process and must treatment methods. The article deals with the must yields of wine grape varieties grown on a large scale inMoravia.(In Czech, English summary only)