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An overall number of sixty samples of treated and untreated sewage was tested in our studies. The samples represented both municipal and industrial sewage (30 samples each type) and were collected respectively at the point of sewage discharge to a river, and at a poultry processing plant, namely from a secondary settler and an aeration chamber, as well as at the discharge of the treated sewage to...
Results of qualitative and quantitative studies on microflora of low-salt herring slices supplemented with 0%, 0.2% and 0.3% of sodium benzoate (E-211) are presented. Herring slices were subjected to low salting with addition of 0%, 0.2% and 0.3% of sodium benzoate according to a recipe provided by a local manufacturer. It was observed that sodium benzoate reduced diversity of bacteria and yeasts...
The effect of physicochemical factors: temperature (20°C, 60°C, 100°C, 121.1°C), pH (2-9), inorganic and organic components, i.e. sodium chloride (5%, 10%, 15%, 20%), carbohydrates: glucose and starch (10%, 20%, 40%), proteins: casein (2.5%, 5%, 10%) and their combinations (e.g. prolonged incubation time at low pH) on in vitro detection of specific fragment of L. monocytogenes iap gene (453 bp) carried...
The effect of various concentrations of salt (0%, 0.7%, 1.5% and 3.6% of sodium chloride) on enzymatic activity of C. famata, C. lipolytica, C. colliculosa, C. holmi and C. albicans isolated from the Szczecin Lagoon was tested. The activity revealed low enzymatic activity of Candida isolated deceasing with the rise in concentration of NaCl in the medium. C. colliculosa expressed the lowest hydrolytic...
Results of qualitative and quantitative analyses of microflora of traditionally and vacuum-packed herring a`la Matias are presented. Forty fillet samples of one producer were bought in randomly chosen local shops and tested. It was stated that their microflora depended on sort of packaging. Gram-positive rods: Brevibacterium spp., Gram-negative rods: Pseudomonas spp., and Gram-positive cocci: Micrococcus...
Results of various culture conditions on adhesion of Listeria monocytogenes strains to hexadecane are presented. Listeria strains cultured in optimal conditions adhered to this hydrophobic carbohydrate to a small extent. It reveals that their cell walls have hydrophilic properties. Application of low-nutrient medium, incubation at low temperature, acidification of medium to pH 5 and addition of 8%...
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