Meat is one of the most important food products. European Union countries, including Lithuania, are the main meat producers in the world - their production comprises more than 16 % of processed meat. In the world commerce meat products conclude 12,8 % of market place, of which 39 % - pork. The purpose of the work - to analyse the preservative gas impact on freshness sustention of pork products. The main tasks are to review the freshness rates of pork products, their evaluation methods; to discuss the ways of long-lasting freshness sustention, which are usable in the processed food industry; to analyse the preservative gas method on the freshness sustention of meat products; to research and to compare the microbiological pollution of the sausages, packed in the preservative gas and not packed in it. The methods of research are: analysis of the primary documents; analysis of the secondary documents; analysis of the scientific literature; analysis of the statistics, microbiological research of pork sausages. The most effect of the preservative gas usable for the packing meat products is obtained by packing smoked sausages, which microbiological pollution after 20 days, increases 1,2 – 2 times.

Four experiments were carried out to examine the extent to which the container shape and color of a consumer product package influence hazard perceptions of that product. The experiments further examined the extent to which consumer product hazard perception influenced consumer precautionary intent. The first experiment demonstrated that participants could design product packages signaling the identity and potential hazard level of the contents. Experiments 2 and 3 validated the results of Experiment 1. Experiment 3 further introduced the concept of precautionary intent; participants were more likely to express precautionary intent for those products perceived as being more hazardous. Experiment 4 examined whether these stated intentions would be acted upon when participants were asked to actually interact with a product; it was found that participants were more likely to engage in precautionary behaviors than had been indicated in Experiment 3.

Bin packing is a problem with many applications in various industries. This thesis addresses a specific instance of the this problem, known as the Container Packing problem. Special attention is paid to the Pallet Loading problem which is a restricted sub-problem of the general Container Packing problem. Since the Bin Packing problem is NP-complete, it is customary to apply a heuristic measure in order to approximate solutions in a reasonable amount of computation time rather than to attempt to produce optimal results by applying some exact algorithm. Several heuristics are examined for the problems under consideration, and the results produced by each are shown and compared where relevant. / Thesis (M.Sc.)-University of Natal, Durban, 1991.

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This study explored the in vitro and in situ antilisterial inhibitory activity of 16 essential oils during indirect exposure: Spanish Basil oil (Ocimum basilicum), Bay oil (Pimenta racemosa), Italian Bergamot oil (Citrus bergamia), Roman Chamomile oil (Anthemis nobilis), Sir Lanka Cinnamon oil (Cinnamomum zeylanicum), Citral, Clove Bud oil (Syzygium aromaticum), Cumin Seed oil (cuminum cyminum), Eucalyptus oil (Eucalyptus globulus), Eugenol, Geranium extract (Pelargonium graveolens), Marjoram oil (Origanum majorana), Neroli extract (Citrus aurantium), Peppermint oil (Mentha piperita L.), Rosemary oil (Rosmarinus officinalis L.),and Spanish Sage oil (Salvia officinalis L.). All essential oils were tested against Listeria monocytogenes (ATCC 4644). In vitro inhibitory activity was determined using the microatmosphere method at three temperatures (37°C, 24°C, 4°C) and six possible volumes (0, 10µl, 25µl, 50µl, 100µl, 150µl, or 200µl). In situ inhibitory activity was determined using inoculated bologna slices packaged in Modified Atmosphere Packaging (80% O2, 20% CO2). Essential oils (0, 0.13ml, 1.35ml, or 2.70ml) were injected into the sample packages adjacent, but not touching, the bologna slices and stored at 24°C for 24h. Basil oil displayed the least antilisterial activity across the three temperature applications in vitro. Peppermint, Cumin Seed, and Citral consistently exhibited the greatest antilisterial activity among the temperature applications in vitro. However, only Eugenol applied at 1.35ml achieved a mean one log10 CFU/ml reduction in LM in situ, which could not be replicated. Peppermint (P < 0.048) displayed significant differences between application volumes (0.13ml, 1.35ml) but did not attain a mean one log10 CFU/ml reduction in LM. This study suggests that while various essential oils can display antilisterial activity in vitro, transitioning into a MAP food system warrants further research in mode of actions and application volumes.

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