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EN
This paper characterizes mechanical properties of the technological subsurface layer produced by medium milling of EM AW-AlCu4MgSi(A) aluminium alloy in hardened state T451 using a ball-end cutter and subsequent roller burnishing using a nitride ceramic ball. It was revealed that ball burnishing operations performed on curvilinear milled surfaces allow obtaining the subsurface layer with a minimum strain-hardening effect and induced compressive residual stresses without visible microstructural changes. As a result, such functional properties of the subsurface layer as fatigue strength, bearing properties and contact strength along with a very smooth machined surface of the Sa roughness of about 0.02 µm can be ensured.
EN
Saccharomyces cerevisiae strains isolated from fish and subsurface layers of the Odra Estuary waters were examined. Statistical comparison showed that the increase in numbers of S. cerevisiae strains was related to an increase in the total number of yeasts and yeast-like fungi in tested samples. In case of analysis of fish mycoflora, correlation wasn’t observed between fish species, places of catch and total viable count of yeasts and yeast-like fungi. RA PD-PCR analysis enabled us to distinguish three main groups; ten genotypes each were determined.
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