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Wlasciwosci przeciwbakteryjne heksanowego i wodnego ekstraktu chrzanu w stosunku do paleczek Salmonella

100%

Szczawinska M. E. , Czapska A. , Szczawinski J. , Jackowska-Tracz A.

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tom 07

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nr 3

65-73

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Effect of UV radiation on survival of Salmonella enteritidis on the surface of ceramic tiles coated with TiO2

100%

Szczawinski J. , Tomaszewski H. , Jackowska-Tracz A. , Szczawinska M. E.

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nr 4

EN

The aim of this study was to determine and compare the antimicrobial activity of UV radiation of wavelength 253.7 nm (used in typical germicidal lamps) against Salmonella Enteritidis on the surfaces of conventionally produced white ceramic wall tiles (matt and shiny) and the same tiles coated with TiO₂, using three different methods: rf diode sputtering, atmospheric pressure chemical vapour deposition (APCVD), and spray pyrolysis deposition (SPD). Results clearly indicate that the bactericidal action of UV radiation is much stronger on the surfaces of tiles coated with TiO₂ than on the tiles uncovered. The strongest bactericidal effects of UV radiation was found for film prepared by APCVD, weaker for sputtering, and the weakest for SPD. Results of experiments for shiny and matt tiles did not differ statistically.

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Parameters of growth curves of Salmonella Enteritidis subjected to conventional heat or microwave treatment

100%

Szczawinski J. , Klusek A. , Szczawinska M. E.

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nr 4

EN

Salmonella Enteritidis culture was subjected to heat or microwave treatment to obtain bacteria reduction by 4, 5, and 6 log units. Control, heated and microwaving micro-organisms were incubated in a nutrient broth at 10°C for 432 h. Growth-curve parameters were calculated using Gompertz and Baranyi equations. It was found that in most cases untreated salmonellae had a shorter generation time, a higher exponential growth rate, and a higher maximum growth rate than heated and microwaving bacteria. Growth of bacteria subjected to microwave treatment was more dynamic than that of bacteria subjected to conventional heating. It was expressed by statistically-significant differences in generation time and exponential growth rate calculated by the Gompertz equation, as well as maximum growth rate calculated by the Baranyi model for both compared groups of salmonellae.

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Evaluation of sensory acuity of students of the Faculty of Veterinary Medicine of Warsaw University of Life Sciences - SGGW in the years 1975-2015

75%

Szczawinski J. , Plawinska-Czarnak J. , Bogdan J. , Szczawinska M. E. , Zarzynska J. , Jackowska-Tracz A.

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nr 01

EN

Veterinary students taking part in practical classes on “Hygiene of food of animal origin” course were tested on taste and odor identification as well as color differentiation. The results were subjected to statistical analysis to: (a) evaluate the influence of sex, smoking, time of day and status of health declared by the students on the results of tests; (b) determine the number of individuals who may fail the tests on taste and odor identification as well as color differentiation; (c) evaluate whether the sensory acuity of veterinary students changed in the 40 years of observation. The study involved 3310 students. A test for taste and odor identification was performed according to Polish Standard (PN-65/A-04021). The test for color differentiation was carried out using Rabkin color plates. The results of the study were elaborated using IBM SPSS Statistics 23. The chi-square test was used to determine whether there are significant differences between numbers of individuals assessed positively in particular experimental groups. The significance of the effect of experimental factors on the number of correctly identified samples was determined using analysis of variance. It was found that sex and smoking exerted a statistically significant effect (p < 0.01) on the number of subjects assessed positively and the number of correctly identified samples in three conducted tests. Female students more often than male students were assessed positively and correctly identified larger number of samples in all conducted tests. Nonsmokers obtained better results than smokers in all performed comparisons (significant difference at p < 0.01). It is worth noting that only 65.9% of students passed all three tests, and 1.3% of them did not pass any. In this last group were only men. The analysis of variance indicated that as time passed (since 1975 to 2015) sensory acuity of veterinary medicine students has increased.