Master Degree / Yüksek Lisans Tezleri
Permanent URI for this collectionhttps://hdl.handle.net/11147/3008
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Master Thesis Environmental Factors Influencing Bacterial Biofilm Formation and Inactivation(Izmir Institute of Technology, 2020) Üreğen, Mert; Özçivici, Engin; Baysal, Ayşe Handan; Baysal, Ayşe Handan; Özçivici, Engin; 03.01. Department of Bioengineering; 03.08. Department of Food Engineering; 03. Faculty of Engineering; 01. Izmir Institute of TechnologyObjective of this study was to evaluate effect of UV-C radiation (0, 1.16 and 3.21 kJ/cm2), pomegranate (Punica granatum) seed essential oil (PGEO) and lemon (Citrus lemonum) plant essential oil (CLEO) on decontamination of Candida albicans, Listeria monocytogenes, Staphylococcus aureus and Esherichia coli O157:H7 biofilms formed at +4°C and 20°C on polystyrene, stainless steel and glass surfaces. After 16, 32 and 64 sec UV-C treatment 0.24 log CFU/cm2, 1.61 log CFU/cm2, 1.59 log CFU/cm2 reductions were achieved in the numbers of C. albicans biofilms formed at 20°C on polystyrene. In the numbers of S. aureus biofilms formed at 20°C on polystyrene 0.99 log CFU/cm2, 1.9 log CFU/cm2, 3.91 log CFU/cm2 reductions were obtained after 16, 32 and 64 sec UV-C treatments, respectively. In general C. albicans biofilm formed at 20°C on stainless steel was found as the most UV-C resistant biofilm. CLEO inhibited the growth of C. albicans, L. monocytogenes and S. aureus at MIC values of 186 µg/ml, 103.5 µg/ml and 103.5 µg/ml, respectively. The results of the study showed that UV-C radiation and CLEO can be used as an anti-biofilm agent to control or to prevent biofilm formation of foodborne bacterial pathogens. It was suggested that UV-C radiation and CLEO treatments have potential as a biofilm control interventions for the food industry.Master Thesis Location Choice of Food Industry in İzmir(Izmir Institute of Technology, 2019) Akbaşoğulları, Nilnaz; Duran, Hüseyin Engin; 01. Izmir Institute of TechnologyIn this study, the spatial distribution of the food companies registered in the Aegean Region Chamber of Industry in İzmir has been investigated and the causality of the site selection has been reviewed. The empirical studies conducted in the literature so far does not include a detailed study on the choice of location of the food industry, a factor that adds strength to this study. The purpose of the current study is to analyse the determinants of firm location in Izmir’s food industry. It particularly focuses on the impact of experience and size of the firms. In this study, we examined, through statistical methods (such as descriptive statistics, maps, cross sectional linear regressions, spatial autocorrelation analyses), 734 companies. The following variables were empirically analysed, firms’ establishment dates, sub-sectors, number of employees, capital assets, locations, distances from the centre of Izmir, distances from the centre of the sub-province that the establishment belongs to and the distance from each other. As a result of the empirical analyses and spatial data evaluation, companies’ choice of location in the food industry can be summarized as follows; Experience plays a very significant role, which means that experienced companies are located in the centre or close to the centre because they have already been well-established in that place. The choice of location does not have any bearing upon the size of the firm.