Kvasny Prumysl, 1978 (vol. 24), issue 6
Sensitivity of Yeast to "Killer yeast" Strains.Peer-reviewed article
O. BENDOVÁ, B. PARDONOVÁ
Kvasny Prum. 1978; 24(6): 121-124 | DOI: 10.18832/kp1978018 
The results of a comprehensive series of experiments disclose, that the presence of "killer" strains in some stages of brewing process can affect very unfavourably fermentation, as well as the quality of final product. They slow down fermentation process and deteriorate organoleptic properties of beer, which is due to a high proportion of dead cells in the culture, their autolysis and unfavourable composition of aromatic compounds present in beer. Th research work also confirms that the "killer" factor can destroy even other species of the Saccharimyces kind, wheares other yeasts are to it quite resistant.(In Czech, English summary only)
Hof Forecrops Beer Upon the Quality of Malting Barley.Peer-reviewed article
© OČKAY
Kvasny Prum. 1978; 24(6): 125-128 | DOI: 10.18832/kp1978019
Through a number of very exact polyfactorial field trials the author has studied the effects of two forecrops, i. e. of silage maize and winter wheat, upon some important mechanical and chemical properties of spring malting barley. Ears on principal stems and on offshoots were evaluated separately by applying the following criteria: effects of forecrop upon the uniformity of corns, proportion of ear number on offshoots to that on pincipal stems, average weight of 1000 corns and contet of protein in dry matter of corns. Spring barley grown after silage maize was better than that preceded by winter wheat. No diference was found in protein percentage...
Indirect Methods of Automatic Substrate Dosing for Aerobic Cultivation of Microorganismus.Peer-reviewed article
F. ©TROS, L. ADÁMEK, M. RUT
Kvasny Prum. 1978; 24(6): 128-131 | DOI: 10.18832/kp1978020
In fed batch cultivations or in continuous cultivations under the limit of oxygen it is advantageous to add substrate in doses related to the growth rate of microorganisms. The concentration of nutritive substrate in medium must be high enough to enable a non retarded growth but must not exceeded certain limits above which may cause undesirable metabolic processes. Beside methods based on chemical and physical properthies of some substrates indirect methods can be practical, too. So e. g. automatic dosing of a carbon source can be based on changes of cultivation parameters caused by the drop of substrate concentration under the critical...
Methods Used in a Big Winery (Vinárské závody, o. p. , Nitra) to Improve the stability and quality of Wine.Peer-reviewed article
© PORUBSKÝ, J. JANIGA
Kvasny Prum. 1978; 24(6): 132-134 | DOI: 10.18832/kp1978021
The article deals with The technologic processes and machinery used in a big Nitra winery to improve the stability and quality its products. The results so far achieved confirm, that introduced methods are effective and prevent wastage.(In Slovak, English summary only)
Determination of Quinine and Caffeine in Non-alcoholic Beverages.Peer-reviewed article
A. PRÍBELA, K. TOMÁ©EK, B. MEDOVARSKÁ
Kvasny Prum. 1978; 24(6): 135-137 | DOI: 10.18832/kp1978022
Statistical investigations confirm, that for routine determination of quinine, present in non-alcoholic beverages, the fluorometric method can be recommended as a very sensitive and specific one, giving reasonably accurate results and requiring little time. As far as the determination of caffeine is concerned, titration should be preferred to photemetric method, since it provides more reliable data and saves time. Theobromine can be best determined by applying a gravmetric method. For exact results, it is, of course, necessary to use partition chromatography.(In Czech, English summary only)