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Search Results: 1 - 10 of 134 matches for " Athanassios Sakadamis "
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Effect of early propranolol administration on portal hypertensive gastropathy in cirrhotic rats
Savas Rafailidis, Charalampos Demertzidis, Konstantinos Ballas, Michail Alatsakis, Nikolaos Symeonidis, Theodoros Pavlidis, Kyriakos Psarras, Valentini Tzioufa-Asimakopoulou, Athanassios Sakadamis
World Journal of Gastroenterology , 2009,
Abstract: AIM: To investigate any protective effect of early propranolol administration in the development of portal hypertensive gastropathy in cirrhotic rats.METHODS: For the development of liver cirrhosis and portal hypertensive gastropathy, 60 rats underwent ligation of the left adrenal vein and complete devascularization of the left renal vein, followed by phenobarbital and carbon tetrachloride (CCl4) administration. After two weeks of CCl4 administration, the rats were randomly separated into two groups. In group A, propranolol was continuously administered intragastrically throughout the study, whereas in group B normal saline (placebo) was administered instead. Hemodynamic studies and vascular morphometric analysis of gastric sections were performed after complete induction of cirrhosis.RESULTS: Vascular morphometric studies showed higher numbers of vessels in all mucosal layers in the control group. Statistical analysis revealed a significantly higher total vascular surface in the control group compared to the propranolol group, but with no statistically significant difference between the mean vascular surfaces between the groups. Our study clearly shows that the increased mucosal blood flow is manifested by a marked increase of vessel count.CONCLUSION: Early propranolol’s administration in portal hypertensive cirrhotic rats seems to prevent intense gastric vascular congestion that characterizes portal hypertensive gastropathy.
Immigrants’ Satisfaction from the National Health System in Greece: In the Quest of the Contributing Factors  [PDF]
Athanassios Vozikis, Maria Siganou
Health (Health) , 2015, DOI: 10.4236/health.2015.711157
Abstract: Immigrants deserve special attention as they constitute a very sensitive social group, facing an increasing risk of social exclusion. The access of immigrants to health services is one of the most important factors, which contributes to their integration into the society of induction. The purpose of this study is to track and assess the immigrants’ satisfaction from the health services provided by the Greek National Health System (NHS). The satisfaction level assessment is examined in conjunction with demographic and socio-economic characteristics of the study participants, as well as with the characteristics that are related to their personal experience with the National Health System in Greece. The research was conducted from March 2012 to May 2013. The sample of the research comprises of 126 “first-generation” immigrants on legal permit of residence in Greece, who lived in the prefecture of Attica. It is panel study based on “snowball sampling” and the statistical analysis was conducted with the use of the Stata (ver. 11), while the statistical analysis used probit estimation techniques. The demographic and social variables—particularly the variables of gender, “understanding the Greek language”, “education”, “participation in the community of origin” and “insurance”—the variables of “health” and specifically “long-term diseases” and the variable of “trust” are found to be highly related with immigrants’ satisfaction degree from the Greek health system. Our research concludes that health is a fundamental, human right and immigrants’ access to health services is essential not only for their instant and effective treatment of their health problems and the improvement of their lives but also for ensuring the public health in Greece. In order to properly incorporate immigrants in Greece in particular, the health policy decision-makers have to pay attention to the contributing factors.
Sample size for testing homogeneity of two a priori dependent binomial populations using the Bayesian approach
Athanassios Katsis
Advances in Decision Sciences , 2004, DOI: 10.1155/s1173912604000033
Abstract: This paper establishes new methodology for calculating the optimal sample size when a hypothesis test between two binomial populations is performed. The problem is addressed from the Bayesian point of view, with prior information expressed through a Dirichlet distribution. The approach of this paper sets an upper bound for the posterior risk and then chooses as ‘optimum’ the combined sample size for which the likelihood of the data does not satisfy this bound. The combined sample size is divided equally between the two binomials. Numerical examples are discussed for which the two proportions are equal to either a fixed or to a random value.
L?union Européenne et la mondialisation du système agroalimentaire grec
Papageorgiou,Athanassios;
Agroalimentaria , 2003,
Abstract: the agro-food system plays a role of primary importance in the economy not only of a large number of member states of the european union, but also for countries in the process of adhesion. in greece, the agro-food system constitutes the foundation on which a large part of the country?s development was built. while after inclusion in the common market, interest in its development has taken on new dimensions. however, it is subject to not only to the common agricultural policy which is more or less ?controlled?, but also to the effects of the strategies of multinational firms (mnf) in the global economy of the union. in our article, after a methodological approach concerning the mnf expansion, we analyze the effects of opening up the greek agro-food system to the european challenge, taking into account both food and agricultural industries (fai) and the level of food distribution.
Developing a pedagogical framework for the design and the implementation of e-portfolios in educational practice
Athanassios Jimoyiannis
Themes in Science and Technology Education , 2012,
Abstract: A theoretical framework for designing, implementing and researching students’ engagement, learning, and personal development in e-portfolios is described in this article. After providing an overview of the research on e-portfolios in education, the paper analyses the theoretical foundations of e-portfolio learning. Following it proposes a conceptual and organizational framework for teachers and instructors a) to conceptualize principles of student motivation, self-directed learning and reflection, and b) to implement effective e-portfolio learning initiatives at secondary and higher education, and teacher professional development. Finally, the article presents representative case studies and good practice examples regarding the implementation of e-portfolio initiatives using different tools in various educational contexts and programs.
Using SOLO taxonomy to explore students’ mental models of the programming variable and the assignment statement
Athanassios Jimoyiannis
Themes in Science and Technology Education , 2011,
Abstract: Introductory programming seems far from being successful at both university and high school levels. Research data already published offer significant knowledge regarding university students’ deficiencies in computer programming and the alternative representations they built about abstract programming constructs. However, secondary education students’ learning and development in computer programming has not been extensively studied. This paper reports on the use of the SOLO taxonomy to explore secondary education students’ representations of the concept of programming variable and the assignment statement. Data was collected in the form of students’ written responses to programming tasks related to short code programs. The responses were mapped to the different levels of the SOLO taxonomy. The results showed that approximately more than one half of the students in the sample tended to manifest prestructural, unistructural and multistructural responses to the research tasks. In addition, the findings provide evidence that students’ thinking and application patterns are prevalently based on mathematical-like mental models about the concepts of programming variable and the assignment statement. The paper concludes with suggestions for instructional design and practice to help students’ building coherent and viable mental models of the programming variable and the assignment statement.
Editorial: Special issue “Investigating the Educational Web 2.0”
Athanassios Jimoyiannis
Themes in Science and Technology Education , 2012,
Abstract:
SUSTAINABLE DEVELOPMENT AS A SOLUTION TO AGRICULTURAL COMPETITIVENESS: THE CASE OF GREECE IN THE ERA OF EUROPEAN INTEGRATION
Athanassios PAPAGEORGIOU
Journal of Central European Agriculture , 2012, DOI: 10.5513/jcea01/13.3.1072
Abstract: The liberalization of international trade, due to the elimination of market barriers between countries within the context of economic unions, like the European Union (EU) and the expansion of globalization have caused increased competitiveness, at both geographical and sector level. European Commission documents state competitiveness as a continuous rise in the standards of living of a nation or region, a definition which combines competitiveness with sustainability and social goals. Although, one of the EU integration objectives is the sustainable rise in the standards of living of a nation, in the case of Greece this seems to be quite problematic. In a long term basis, the Common Agricultural Policy application found country’s agriculture unprepared and weak to face the new market conditions. The Greek economic crisis can be considered as an opportunity to redefine country’s entire development strategy. As far as the agricultural sector is concerned, this re- establishment could use the principles of sustainability, showing proper respect to the economical, social and environmental characteristics of the regions.
The development, the present situation and the prospects of Greek agriculture
Athanassios Papageorgiou
Advances in Agriculture & Botanics , 2010,
Abstract: There is a general consensus that the future of the European agricultural sector faces greatinsecurity. However, while agricultural exodus continues to constitute, in many Southern EuropeanUnion regions, one of the most significant manifestations of agricultural occupational mobility, ruralexodus should not be taken for granted. A large part of the surplus of agricultural labour force isabsorbed locally due to economic decentralization and the concomitant development of nonagriculturalactivities, especially in the tertiary sector. The development of part-time farming and pluriactivityprovides supplementary income to the farm holder or to other family members. This has allowed thesurvival of small, non-viable holdings which could not have been sustained otherwise. However,traditional and often outdated production and cultivation systems, as well as trade methods, hinderagricultural sector growth. In Greece, these dynamics have caused a number of changes to theemployment structure of the active agricultural population, to agricultural income and to the country’sagricultural competitiveness. The last forty years have witnessed a decrease in the percentage of theactive agricultural population from 36% during the 60s to 10.5% in 2007, agricultural income has overtripled, the agricultural gross national product is 7.3% of the GNP of the country and although theagro-food trade balance is in deficit, the value of agricultural exports represents 19.6% of the totalexports of the country.
Remarques sur certains archa smes iconographiques dans les peintures murales byzantinisantes de la Pologne au XVe siècle
Semoglou Athanassios
Zograf , 2008, DOI: 10.2298/zog0832151s
Abstract: (francuski) L'étude des certains rarissimes archa smes iconographiques dans les peintures murales de style byzantin en Pologne de l'époque du roi Ladislas Jagiello (fin du XIVe - début du XVe siècle) a révélé la pénétration d'une tradition riche et originale qui remonte au milieu syro-palestinien des premiers siècles du christianisme. Ce langage pictural conservateur traduit le phénomène du retour à des formules archa ques et s'inscrit dans l'effort, de la part du roi, d'harmoniser les tensions politiques et religieuses des deux communautés du pays (orthodoxe et catholique), grandi après l'union du grand Duché de Lituanie au royaume de Pologne en 1386. .
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