Kvasny Prumysl, 1987 (vol. 33), issue 3
Ergosterol in brewing yeasts.Peer-reviewed article
G. BASAŘOVÁ, L. LÖBLOVÁ
Kvasny Prum. 1987; 33(3): 65-68 | DOI: 10.18832/kp1987012 
An information study of ergosterol content in brewing and baker's yeasts was made. Six methods for the ergosterol determination were tested. As a result the Longley method was used in further work. When a cell disintegration was made prior to the cell hydrolysis a higher ergosterol yield was found. Steroids were isolated from the cell mass by the alkaline hydrolysis with a following extraction by cyclohexane. The ergosterol content in bakers yeast was about 2 to 5 times higher than that in brewing yeasts. It was found that the ergosterol content in brewing yeasts can be 3 to 5 times increased by the following short-term cultivation in salt media with...
Application of Robotron 1715 systems for an improvement in commercial transaction of breweries and malt-houses trust.Peer-reviewed article
L. DOLEŽEL
Kvasny Prum. 1987; 33(3): 69-70 | DOI: 10.18832/kp1987013
An application of modern computer techniques in the sale department of each brewery increases the quality of commercial transactions of the whole trust. For our production conditions the microcomputer Robotron 1715 from GDR was chosen. This computer will treat all the orders including their changes and on a base of the production possibilities also will perform the bills of delivery. In he next phase these microcomputers will be applied for further part of the operation in the brewery.(In Czech, English summary only)
Polarographic determination of free sulphur dioxide in wines.Peer-reviewed article
J. FARKAŠ, J. KOVÁČ
Kvasny Prum. 1987; 33(3): 71-73 | DOI: 10.18832/kp1987014
The polarographic method for the determination of the free sulphur dioxide content in wines was developed. The method is quick, correct, enables to make a record and is suitable for the inspection of the free sulphur dioxide level both in white and red wines.(In Slovak, English summary only)
Ornithine and citruline production by fermentation.Peer-reviewed article
J. PLACHÝ
Kvasny Prum. 1987; 33(3): 73-75 | DOI: 10.18832/kp1987015
Productions of 10 g.l-1 citruline and 30 g.l-1 ornithine were achieved during 96 hours submerged cultivation of auxotrophic mutants of Corynebacterim sp. 9366 which were dependent to arginine. The ornithine preparation process by a fermentation has been developed. The production of 30 g.l-1 ornithine was achieved after 60 hours of the cultivation. The production medium contained molasses and hydrolyzate of peanut meal.(In Czech, English summary only)
Bioreactors: II. One-stage reactors with mechanical agitation.Peer-reviewed article
J. PÁCA
Kvasny Prum. 1987; 33(3): 75-79 | DOI: 10.18832/kp1987016
The following types of bioreactors are described: reactor with a turbine impeller, loop reactors with a marine propeller or with combined impellers, various types of systems without gas spargers and reactors with multiple impellers. The principle, the maximum vessel volume and possible applications are discussed by each type of the reactor. With respect to the keeping of the process asepticity possible ways of the scale-up with respect to the reactor shape are mentioned.(In Czech, English summary only)
Cooling circuit of 200 m3 fermenter.Peer-reviewed article
P. SEICHTER, O. VÍTEK, P. VAŠÁK, K. PĚNČÍK, L. PEŠL
Kvasny Prum. 1987; 33(3): 79-81 | DOI: 10.18832/kp1987017
The cooling circuit of the 200 m3fermenter consists of centrifugal pumps (Sigma, tape NFT) and plate exchangers (Maschine Works Chotěboř). The best function of this circuit was achieved when the medium was taken of from the place with the lowest gas hold-up in the fermenter. The pump function and the broth discharge rate is constant with the hold-up of air up to 35 %. Under these conditions the pressure loss of the plate exchanger remains up to 0,15 MPa at he flow rate of 300 m3.h-1. The plate exchanger used for the cooling has a high value of the heat transfer coefficient above 2500 W.m-2.K-1.(In Czech,...