Kvasny Prumysl, 1986 (vol. 32), issue 5
Dimethyl sulphide in beer and malt.Peer-reviewed article
B. ©PINAR, V. KELLNER, J. ČULÍK
Kvasny Prum. 1986; 32(5): 98-101 | DOI: 10.18832/kp1986021 
Dimethyl sulphide (DMS) is a significant component affecting sensorial properties of beer. DMS is formed from a splitting of thermal labile precursors of DMS during the brewing process and in the yeast metabolism during a fermentation of wort. Also the residual quantity of non-splitted precursors in wort affects the level of DMS in beer. These precursors are splitted during pasteurization and storage under higher temperatures that results in an increased level of DMS in the bottled beer. The DMS level in beer can be influenced by the technology of the malting, the beer production and the storage. The head-space technique of GLC with the flame-photometric...
Photoelectric device for a measurement of beer foam stability.Peer-reviewed article
J. ©AVEL, R. TROCHTA, Z. ©AFRATA, J. KRÁTKÝ
Kvasny Prum. 1986; 32(5): 101-103 | DOI: 10.18832/kp1986022
The photoelectric device for a measurement of beer foaming is described. The device include a swinging arm with the light equipment that can be submerged into the foaming beer. The electronic equipment measures the time of the light passage through the liquid-foam between two adjusted positions of the light equipment. The destruction of froth can be measured in a range of the validity of the destruction equation of the first order o as the time foam the beginnings of a foaming to the chosen stage of the foam destruction. The maximum reproducibility of the measurement was obtained for the beer foaming induced by an injection of water beer or by a supersound....
Effects of volatile organic acids in molasses on an alcoholic fermentation and yeast biomass production.Peer-reviewed article
J. LANGPAULOVÁ
Kvasny Prum. 1986; 32(5): 103-106 | DOI: 10.18832/kp1986023
The effect of formic, acetic and butyric acid on an alcoholic fermentation and biomass production with selected industrial yeast strains was tested. For the production strain LK 01/1 the following maximum limit concentrations were found: 0.08 g.100 ml-1 of formic acid, 0.25 g.100 ml-1 of acetic acid and 0.03 g.100 ml-1 of butyric acid in the substrate. At these concentrations, both the biomass yield as well as the yield of alcohol were not yet affected. The strain 03/26 of the baker's yeast was more sensitive to the acids tested and the maximum limit concentrations were as follows: 0.03 g.100 ml-1 of formic...
Application of antifoams during fermentation of alkaline proteases.Peer-reviewed article
A. ©NAJDROVÁ, E. KUZMOVÁ, V. SITKEY
Kvasny Prum. 1986; 32(5): 106-108 | DOI: 10.18832/kp1986024
An application of antifoams in the production of microbial enzyme preparates is very significant. The article describes the application of chemical antifoams during a submerged fermentation of alkaline protease with the production strain of Bacillus subtilis. A comparison of various types of antifoams of the domestic and foreign production is made in the experimental part of the article. The experimental result proved that the most suitable preparate of domestic antifoams was Depenol N 101 that was developed for this purpose in the Research Institute VÚP in Nováky.(In Slovak, English summary only)
Construction of fermenters for sterile biosynthetic processes.Peer-reviewed article
P. ETTLER, J. NUTIL
Kvasny Prum. 1986; 32(5): 108-110 | DOI: 10.18832/kp1986025
The task of engineering works is a development of large-scale fermenters with a high technical-economical effectivity of the production. The article describes a basic equipment of fermenters for sterile biosynthetic processes media sterilization, solution of the aseptic sealing of the shaft for an installation of the driving unit on a pilot-plant as well as on a large-scale plant level.(In Czech, English summary only)
Production of monensins by strains of Streptomyces cinnamonensis resistant to propionate.Peer-reviewed article
J. MATĚJŮ, J. KARNETOVÁ, S. POSPÍ©IL, M. NOHÝNEK, M. BERAN, Z. VANĚK
Kvasny Prum. 1986; 32(5): 110-111 | DOI: 10.18832/kp1986026
Variants resistant to propionate were prepared from a mutant strain of Streptomyces cinnamonensis producing predominantly monensin A. during batch cultivation they exhibited considerable variability of production (0 - 250 % of control). With selected resistants the production of monensins (in media with higher concentration of propionate) was examinated. Stimulation of monensin synthesis by propionate was observed with 70 % of the resistants studied. Propionate did not influence the ratio between monensin A and b production.(In Czech, English summary only)
Czechoslovak Collection of Microorganisms and biotechnology development.Peer-reviewed article
Z. PÁČOVÁ, M. SOVADINA
Kvasny Prum. 1986; 32(5): 113-114 | DOI: 10.18832/kp1986027
Czechoslovak Collection of Microorganisms serves as bank for cultures which are used in basic and applied research, biotechnology, industry, agriculture, human and veterinary medicine and education. It maintains more over than 5000 strains of bacteria and microscopic fungi representing 155 genera and 433 species of fungi. The collection also accepts for depositing cultures which are subjects of patent procedures. It gives information on isolation, cultivation, maintenance and classification of different groups of bacteria and fungi. It provides some other services, e. g. identification and conservation of cultures for various institutes.(In Czech,...