Antimicrobial and antioxidant activities of Turkish extra virgin olive oil from different varieties

Thesis (Master)--Izmir Institute of Technology, Biotechnology, Izmir, 2009Includes bibliographical references (leaves: 58-64)Text in English; Abstract: Turkish and Englishxiii, 79 leavesOlive oil is the main source of fat in Mediterranean diet. The major active components of olive oil include oleic acid, phenolic compounds and squalene which have different benefits such as cancer prevention, antimicrobial and antioxidant activities, and lowering the incidence of skin cancer, respectively. In recent years, the number of studies about the biochemical properties of different varieties of olive oils and their phenolic contents has dramatically increased.In this study, Turkish EVOO from different varieties and their phenolic compounds were investigated in terms of their antimicrobial and antioxidant properties as well as refined olive, hazelnut and canola oils. Antimicrobial activities of EVOOs and ten phenolic compounds were tested against three foodborne pathogenic bacteria, Escherichia coli O157:H7, Listeria monocytogenes and Salmonella Enteritidis which are the foremost bacterial cause of the largest number of outbreaks, cases and deaths in the world. While all EVOOs showed bactericidal effect the phenolics demonstrated slight antimicrobial activity with percent inhibition between 0-25 of growth rate of bacteria. Moreover, refined olive, hazelnut and canola oils did not show any antimicrobial activity.Finally, antioxidant activities of EVOOs, refined olive, hazelnut and canola oils were determined by B-carotene-linoleic acid model system and ABTS radical scavenging method. According to B-carotene-linoleic acid method, it was observed that antioxidant activities of oil samples varied between 21.19% and 64.54%. On the other hand, it was found that free radical scavenging activities varied between 1.21% and 21.97% as a result of ABTS method. These results were correlated with TPC values of oils

Out-of-core implementation of the parallel multilevel fast multipole algorithm

Ankara : The Department of Electrical and Electronics Engineering and the Graduate School of Engineering and Science of Bilkent University, 2013.Thesis (Master's) -- Bilkent University, 2013.Includes bibliographical references leaves 35-36.We developed an out-of-core (OC) implementation of the parallel multilevel fast multipole algorithm (MLFMA) to solve electromagnetic problems with reduced memory. The main purpose of the OC method is to reduce in-core memory (primary storage) by using mass storage (secondary storage) units. Depending on the OC implementation, the in-core data may be left in one piece or divided into partitions. If the latter, the partitions are written out into mass storage unit(s) and read into in-core memory when required. In this way, memory reduction is achieved. However, the proposed method causes time delays because reading and writing large data using massive storage units is a long procedure. In our case, repetitive access to data partitions from the mass storage increases the total time of the iterative solution part of MLFMA. Such time delays can be minimized by selecting the right data type and optimizing the sizes of the data partitions. We run the optimization tests on different types of mass storage devices, such as hard disks and solid state drives. This thesis explores OC implementation of the parallel MLFMA. To be more precise, it presents the results of optimization tests done on different partition sizes and shows how computation time is minimized despite the time delays. This thesis also presents full-wave solutions of scattering problems including hundreds of millions of unknowns by employing an OC-implemented parallel MLFMA.Karaosmanoğlu, BarışcanM.S

Impacto de diferentes épocas de cosecha en el perfil de ácidos grasos, esteroles, tocoferoles y propiedades bioactivas del aceite de avellana

This study was carried out to determine the effects of different harvest times of hazelnuts on their lipid profiles and bioactive compound accumulations. Tombul hazelnut cultivar was harvested at four different harvest stages, namely in PH (pre-harvest time), EH (early harvest time), NH (normal harvest time) and LH (late harvest time). According to the results of the study, oil accumulation continued up to NH but did not further increase into LH (from 49.58 to 58.54 mg/100 g). Oxidative stability indices changed positively due to decreased poly-unsaturated fatty acids (PUFA) from 9.87 to 7.70% in LH. The highest total sterol amount was reached in LH (122.32 mg/100 g). Although the change in the tocopherol content in the oil was irregular with the progression of the harvest time, its amount in the nuts increased continuously. Total carotenoid, phenolic, flavonoid, and antioxidant activity (DPPH and ABTS) peaked in EH and decreased to a minimum in LH.Este estudio se llevó a cabo para determinar los efectos de diferentes épocas de cosecha de avellanas sobre los perfiles de lípidos y las acumulaciones de compuestos bioactivos. El cultivar de avellana Tombul se cosechó en cuatro épocas diferentes en el orden: PH (época previa a la cosecha), EH (época de cosecha temprana), NH (época de cosecha normal) y LH (época de cosecha tardía) con referencia al NH. Según los resultados del estudio, la acumulación de aceite continuó hasta NH, pero no aumentó más en LH (de 49,58 a 58,54 mg/100 g). Los índices de estabilidad oxidativa cambiaron positivamente debido a la disminución de los ácidos grasos poliinsaturados (AGPI) del 9,87 % al 7,70 % en la LH. La cantidad total de esteroles más alta se alcanzó en la LH (122,32 mg/100 g). Aunque el cambio en el contenido de tocoferoles en el aceite fue irregular con el avance del tiempo de cosecha, su cantidad en la nuez aumentó continuamente. La actividad total de carotenoides, fenólicos, flavonoides y antioxidantes (DPPH y ABTS) alcanzó su punto máximo en EH y disminuyó a un mínimo en LH

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Taha Toros Arşivi, Dosya No: 80-Yakup Kadri Karaosmanoğlu. Not: Gazetenin "Bir Kitap" köşesinde yayımlanmıştır.İstanbul Kalkınma Ajansı (TR10/14/YEN/0033) İstanbul Development Agency (TR10/14/YEN/0033

Büyük bir kültür eseri

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Yakup Kadri Karaosmanoğlu

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Determinants of corporate image formation: a consumer-level model incorporating corporate identity mix elements and unplanned communication factors

This thesis aims to extend the current knowledge about corporate image formation process by developing a comprehensive model which incorporates corporate identity mix elements (i.e. symbolism, communication, and behaviour) and unplanned communication factors (i.e. interpersonal, intermediary and intrapersonal communication). By examining the proposed conceptual model, this study challenges the claims of anything a company does communicate its identity (Balmer, 1997, 2001; Van Riel and Balmer, 1997) by testing the impact of company-driven communication efforts on corporate image formation in the consumer context. It also adopts the understanding of corporate image as a composite product of multiple communication factors (Bhattacharya and Sen, 2003; Cornelissen, 2000) and in addition to formal communication efforts it specifically tests the role of interpersonal communication, intermediary communication and intrapersonal communication factors in corporate image formation (Cornelissen, 2000). This research adopts a predominantly quantitative approach which is supported by insights from an exploratory phase that encompasses in-depth interviews and focus group discussions. The main survey data is derived from a cross-sectional survey which is conducted in Turkey. The data drawn from 439 questionnaires is analysed by multivariate data analysis technique including exploratory factor analysis (EFA), Cronbach alpha, confirmatory factor analysis (CFA) and structural equation modelling (SEM). The findings show that not every aspect of corporate identity mix elements (e.g. corporate aesthetics, staff apparel) is considered to be salient communicators of corporate identity by consumers. They also indicate that when consumers attribute positive feelings to a company’s corporate visual identity systems, when they think that marketing communication activities reflect corporate values, and when they perceive a company as socially responsible, they tend to form a favourable image of that organisation. Moreover, the results highlight that interpersonal communication (word-of-mouth information exchange among close friends and relatives) and intrapersonal factors (i.e. corporate associations gap, consumer-company identification, emotional appeal, consumer-company value congruence) are determinants of corporate image formation. However, it is found that employee behaviour and intermediary communication may not activate immediate associations about corporate image

Günebakan

Taha Toros Arşivi, Dosya No: 42-Hamdullah Suphi Tanrıöver. Not: Gazetenin "Tenkit ve Bibliografya" köşesinde yayımlanmıştır