Authors:G. Péter, D. Dlauchy, E. Szűcs, and J. Tornai-Lehoczki
In this study a simple and effective method was developed for the isolation of Saccharomyces strains from grapes. Aseptically collected grape samples were processed by enrichment in a nutritive basal medium supplemented with 10% (v/v) methanol followed by isolation of yeast strains. Sixteen of the 18 grape samples yielded Saccharomyces strain(s). More than 70% of the isolates belonged to the genus Saccharomyces. Based on phenotype and electrophoretic karyotyping, all strains of Saccharomyces were identified as S. cerevisiae. For several grape samples, varying physiological characters, the number of spores per asci, and the observed chromosome length polymorphisms provided evidence for diversity of S. cerevisiae strains obtained by this enrichment in methanol-containing broth. Results indicated that enrichment in methanol-containing broth is an effective alternative method to facilitate isolation of Saccharomyces strains from grapes. The enrichment method described in this work provides a simple and effective tool for isolation of Saccharomyces strains from grapes. The method may be applied in studying wine fermentation ecology, as well as for the isolation of potential starter strains from grapes.
Authors:M. Molnár, L. Hornyák, R. Nagy, E. Márki, and Gy. Vatai
Our experiments were based on a model solution containing five of the main pineapple aroma components. Both sweeping-gas pervaporation and vacuum-pervaporation methods were carried out. Measurements were performed at different temperatures and feed flow rates. The purposes of this study were to examine applicability of the two pervaporation methods in reference to the pineapple aroma recovery, the effects of the operating parameters on the process, and modelling the pervaporation process by resistance-in-series model. Higher enrichment could be reached with vacuum-pervaporation than the sweeping-gas method. The separation process is determined by the diffusion of compounds in the membrane, thus the resistance in the boundary layer at liquid side is negligible. Based on performed experiments, the pervaporation process can be applied in beverage industry for aroma recovery.
the environment in which they grow. Growing of Agaricus bisporus on substrates enriched with Se at 0.6 mmol L −1 concentration resulted in 2.5 times increase in the amount of selenium in the fruiting bodies ( Rzymski et al., 2016 ). Likewise, the
Authors:K. Ianakiev, J. Goda, T. Hill, C. Moss, J. Ong, M. Paffett, R. Parker, and M. Swinhoe
We report our developments of the next generation of uranium enrichment monitoring technology for gas centrifuge enrichment
plants (GCEPs). The main challenge presented by current technology is the need for periodic replacement of the short half-life
(1.27 year) 109Cd transmission source. We report on a transmission source at the 22.1 keV K-edge of ruthenium based on an X-ray tube with
a “notch” filter. As part of the design we have modeled the NaI detector passive shielding with the MCNP code. Some preliminary
results from experiments and modeling will be presented.
Authors:B. Schäffer, B. Keller, Z. Szakály, and D. Lőrinczy
can be stated that inspite of quantitative and qualitative change of foods consumed, the dietary Ca:P ratio remained the same [ 3 ]. The ratio in both years was 1:2.
One of the possibilities to improve the dietary Ca:P ratio is to enrich the
): Detection of pathogenic Yersinia enterocolitica in enrichment media and pork by a multiplex PCR: a study of sample preparation and PCR-inhibitory components. Int. J. Fd Microbiol. , 4 , 93-105.
Detection of pathogenic Yersinia